CN104811255A - Antenna calibration method and device - Google Patents
Antenna calibration method and device Download PDFInfo
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Abstract
The invention relates to the communication field, in particular to an antenna calibration method and device. The antenna calibration method and device is used for effectively reducing influences of interference signals to a calibration process during antenna calibration at a base station. The antenna calibration method comprises the following steps that a brand new calibration interference escape mechanism is designed, the base station performs interference measurement within special time to select a candidate time period with the interference signal intensity being smaller than that of a preset threshold firstly when selects a calibration time point, then selects a calibration time point in the candidate time period and performs antenna calibration based on the calibration time point. According to the antenna calibration method, calibration operation can be executed at a position with the lowest interference degree through disturbance calculation, influences of interference to calibration coefficients are reduced to the largest extent, and performances of TDD base station beam forming are guaranteed.
Description
Technical field
The present invention relates to the communications field, particularly a kind of antenna calibration method and device.
Background technology
At mobile communication time division duplex Long Term Evolution (Time division duplex, TDD LTE) in system, need the calibration function of 8 antennas, object is in order to beam shaping function can make full use of the heterogeneite of up-downgoing channel, thus shows best effect.
At present in the TDD LTE network of China Mobile, be operated in the TD SDMA Time Division Synchronized Code Division Multiple Access of F-band, TD-SCDMA) system, be operated in the TD-SCDMA system of A frequency range, and the time-division Long Term Evolution (TimeDivision Long Term Evolution, TD-LTE) being operated in F-band shares same radio frequency unit and antenna feeder.Further, based on standard regulation, the up-downgoing transmitting time point of TD-SCDMA system and TD-LTE system and up-downgoing time of reception point need alignment.
Specifically consult shown in Fig. 1; under TD-LTE and TD-SCDMA common mode configuration surroundings; the time slot proportion of the frame structure of TD-SCDMA is 2 sub-frame of uplink (U) 5 descending sub frame (D); the time slot proportion of the frame structure of TD-LTE is 1U3D; therefore; the alignment time point of TD-SCDMA and TD-LTE is all positioned at protection time slot (Guard Period, the GP) position of TD-SCDMA.
Consult shown in Fig. 2, at present, because TDD LTE system introduces special subframe configuration 6 at F-band, like this, when time calibration is carried out in GP position in a certain base station not adopting special subframe to configure 6, the downstream signal of the descending pilot frequency time slot (Downlink Pilot Time Slot, DwPTS) of the neighboring station of special subframe configuration 6 is adopted just to do with above-mentioned a certain base station the time point calibrated overlapping in time domain; In addition, the passage employing normal traffic signal due to calibrating signal sends, thus transmitting power is higher, the interference performance of anti-adjacent area is strong, but receive because calibrating signal have employed calibrated channel (Boosterless), therefore received power is lower, be easy to the descending pilot frequency interference being subject to adjacent area, thus it is incorrect to cause calibrating the coefficient obtained, thus likely have influence on calculating and the excipient effect of follow-up excipient coefficient, and then badly influence the signal emitting performance of base station.
Summary of the invention
The embodiment of the present invention provides a kind of antenna calibration method and device, during in order to carry out antenna calibration in base station, effectively reduces the impact of interference signal on calibration flow process.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A kind of antenna calibration method, comprising:
Interferometry is carried out within the scope of the first fixed time in current TD-LTE radio frames in base station, and described first fixed time scope is the partial period in described current TD-LTE radio frames in special subframe;
Base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and selectes alignment time point in described candidate time section;
The described alignment time of base station in next TD-LTE radio frames, when putting and arrive, performs calibration operation.
Like this, by calculating interference, the position execution calibration operation that an annoyance level is relatively minimum can be selected, thus farthest reduce the impact disturbed and calibration factor is calculated, thus ensureing the performance of TDD base station beam excipient.
Interferometry is carried out within the scope of the first fixed time in current TD-LTE radio frames in base station, comprising:
Base station by current TD-LTE radio frames with the time point protecting time slot GP original position to align in time-division duplex TD-SCDMA radio frames, as the starting point of described first fixed time scope, by special time slot end time point in current TD-LTE radio frames, as the end point of described first fixed time scope;
Interferometry is carried out in base station within the first selected fixed time.
Base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and selectes alignment time point within the described time period, comprising:
Base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time;
If base station is determined self to adopt TDD special subframe configuration 5, then base station is when determining further to include the second fixed time scope in described candidate time section, selected alignment time point within described second fixed time, wherein, base station using the time point that aligns with GP original position in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described second fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described second fixed time scope;
If base station is determined self to adopt TDD special subframe configuration 6, then base station is when determining further to include the 3rd fixed time scope in described candidate time section, selected alignment time point within described 3rd fixed time, wherein, base station using the time point that aligns with sub-end position special in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described 3rd fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described 3rd fixed time scope.
Comprise further:
If base station is determined self adopt TDD special subframe configuration 5 and do not include the second fixed time scope in described candidate time section, or, if when base station is determined self adopt TDD special subframe configuration 6 and do not include the 3rd fixed time scope in described candidate time section, then base station is when determining further to include the 4th fixed time scope in described candidate time section, selected alignment time point within described 4th fixed time; Wherein, described 4th fixed time scope is the time period within the scope of the first fixed time except described second fixed time scope and the 3rd fixed time scope.
Comprise further:
In the process that the selected alignment time puts in the 4th fixed time section, indicate each terminal in described 4th fixed time section, reduce the transmitting power of detection reference signal SRS, and reduce the SRS expectation received power of self.
Comprise further:
If base station, according to the interference measurement results obtained, does not filter out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, then selected alignment time point on the sub-frame of uplink after described first fixed time scope.
Selected alignment time point on the sub-frame of uplink of base station after the first fixed time scope, comprising:
Base station, after the first fixed time scope, filters out the regular upstream subframe not carrying Physical Random Access Channel and SRS, and therefrom selectes alignment time point.
Comprise further:
If selected alignment time point in the sub-frame of uplink of base station in current TD-LTE radio frames, then in all communities of this locality administration, described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
Comprise further:
Base station notifies adjacent base station by X2 interface, and the described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
A kind of antenna calibration equipment, comprising:
Measuring unit, for carrying out interferometry within the scope of the first fixed time in two Long Term Evolution TD-LTE radio frames of current time-division, described first fixed time scope is the partial period in described current TD-LTE radio frames in special subframe;
Screening unit, for according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and selectes alignment time point in described candidate time section;
Alignment unit, when putting arrival for the described alignment time in next TD-LTE radio frames, performs calibration operation.
Like this, by calculating interference, the position execution calibration operation that an annoyance level is relatively minimum can be selected, thus farthest reduce the impact disturbed and calibration factor is calculated, thus ensureing the performance of TDD base station beam excipient.
When carrying out interferometry within the scope of the first fixed time in current TD-LTE radio frames, described measuring unit is used for:
By in current TD-LTE radio frames with the time point protecting time slot GP original position to align in time-division duplex TD-SCDMA radio frames, as the starting point of described first fixed time scope, by special time slot end time point in current TD-LTE radio frames, as the end point of described first fixed time scope;
Interferometry is carried out within the first selected fixed time.
According to the interference measurement results obtained, within described first fixed time, filter out the candidate time section of interference signal intensity lower than pre-determined threshold, and within the described time period during selected alignment time point, described screening unit is used for:
According to the interference measurement results obtained, within described first fixed time, filter out the candidate time section of interference signal intensity lower than pre-determined threshold;
TDD special subframe configuration 5 self is adopted if determine, then when determining further to include the second fixed time scope in described candidate time section, selected alignment time point within described second fixed time, wherein, described screening unit using the time point that aligns with GP original position in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described second fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described second fixed time scope;
TDD special subframe configuration 6 self is adopted if determine, then when determining further to include the 3rd fixed time scope in described candidate time section, selected alignment time point within described 3rd fixed time, wherein, described screening unit using the time point that aligns with sub-end position special in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described 3rd fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described 3rd fixed time scope.
Described screening unit is further used for:
Self adopt TDD special subframe configuration 5 if determine and do not include the second fixed time scope in described candidate time section, or, when self adopting TDD special subframe configuration 6 if determine and do not include the 3rd fixed time scope in described candidate time section, then when determining further to include the 4th fixed time scope in described candidate time section, selected alignment time point within described 4th fixed time; Wherein, described 4th fixed time scope is the time period within the scope of the first fixed time except described second fixed time scope and the 3rd fixed time scope.
Comprise further:
First scheduling unit, for in the process of described screening unit selected alignment time point in the 4th fixed time section, indicate each terminal in described 4th fixed time section, reduce the transmitting power of detection reference signal SRS, and reduce the SRS expectation received power of self.
Described screening unit is further used for:
If according to the interference measurement results obtained, do not filter out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, then selected alignment time point on the sub-frame of uplink after described first fixed time scope.
On sub-frame of uplink after the first fixed time scope during selected alignment time point, described screening unit is used for:
After the first fixed time scope, filter out the regular upstream subframe not carrying Physical Random Access Channel and SRS, and therefrom select alignment time point.
Comprise further:
Second scheduling unit, for when in the sub-frame of uplink of described screening unit in current TD-LTE radio frames during selected alignment time point, in all communities of this locality administration, described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
Described second scheduling unit is further used for:
Notify adjacent base station by X2 interface, the described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
Accompanying drawing explanation
Fig. 1 is the frame head corresponding relation of TDL frame and TDS frame under prior art;
Fig. 2 is that in prior art and the embodiment of the present invention, TDL calibrates time-domain position schematic diagram;
Fig. 3 is that in the embodiment of the present invention, TDL calibrates flow chart;
Fig. 4 is base station functions structural representation in the embodiment of the present invention.
Embodiment
Under the networking scene of special subframe configuration 6 being configured with TDD standard, in order to avoid base station when carrying out antenna calibration, be subject to the interference of neighboring station downstream signal, thus it is abnormal to cause calibration factor to occur, in the embodiment of the present invention, propose solution, be specially: by calculating the noise power in calibration moment, thus judge whether to there is interference, and then the time-domain position of Dynamic Selection calibration hides interference.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
In the embodiment of the present invention, for TDD-LTE base station, by measuring the grade determining current interference in real time, thus corresponding alignment time point (time-domain position namely calibrated) can be selected.
Consult shown in Fig. 3, in the embodiment of the present invention, being operated in TDD-LTE, to carry out the detailed process of antenna calibration as follows:
Step 300: interferometry is carried out within the scope of the first fixed time in current TD-LTE radio frames (hereinafter referred to as TDL frame) in base station, this first fixed time scope is the partial period in current TDL frame in special subframe.
In practical application, the base station of TDD-LTE standard all needs when each TDL frame starts to perform interferometry, to determine which time-domain position can perform calibration operation in each TDL frame, in the present embodiment, be only introduced for a TDL frame (i.e. above-mentioned current TDL frame).
Further, consult shown in Fig. 2, so-called special subframe, namely refer in a radio frames and contain descending pilot frequency time slot (Downlink Pilot Time Slot, DwPTS), protection time slot (Guard Period, GP), uplink pilot time slot (Uplink Pilot Time Slot, UpPTS) subframe, under normal circumstances, in TD-SCDMA system, during to each subframe numbering, special subframe is foreclosed, namely special subframe does not have subframe to number, and in TD-LTE system, under special subframe configuration 5 and special subframe configure 6 both of these cases, special subframe is numbered subframe 1.
Concrete, when performing step 300, the time point can will alignd with GP original position in multiple access TD-SCDMA radio frames (hereinafter referred to as TDS frame) in current TDL frame in base station, as the starting point of the first fixed time scope, by special time slot end time point in current TDL frame, as the end point of the first fixed time scope, then, within the first selected fixed time, interferometry is carried out.Specifically as shown in Figure 2; under the application scenarios of TDD-LTE system and TDD-SCDMA system common-mode; namely first fixed time scope refers to the 1450us-2000us that TDL frame head starts; the position limitation that usual base station performs calibration operation at this moment between in scope, otherwise the up-downgoing business of base station can be affected.
Step 310: base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within above-mentioned first fixed time, and alignment time point is selected in this candidate time section.
Concrete, base station can according to practical application request, interference is divided three classes, low interference, moderate interference and high interference, and in the embodiment of the present invention, namely above-mentioned pre-determined threshold refers to low interference threshold, only has when base station is according to interference measurement results, determines in some the candidate time section in the first fixed time scope, when neighboring station signal belongs to low interference to the interference that this base station is caused, alignment time point can be chosen in these candidate time sections.Preferably, for judging that the value of the pre-determined threshold of low interference can be set to 100dbm/180kHz.
Step 320: when the above-mentioned alignment time of base station in next TDL frame puts and arrive, perform calibration operation.
Base station is in current TDL frame after selected alignment time point, and this alignment time effective duration of point is a TDL frame, and so, in next TDL frame, when after the above-mentioned alignment time point of arrival, base station can start to perform antenna calibration operation.
Based on above-described embodiment, in the process performing step 210, after the candidate time section being in low disturbance state is picked out in base station within above-mentioned first fixed time, can adopt various ways in candidate time section, pick out alignment time point, specifically include but not limited to under type:
First kind of way is: if base station is determined self to adopt TDD special subframe configuration 5, then base station is when determining further to include the second fixed time scope in candidate time section, selected alignment time point within the second fixed time, wherein, base station using the time point that aligns with GP original position in TDS frame in the current TDL frame starting point as the second fixed time scope, using GP end time in current TDL frame o'clock end point as the second fixed time scope;
Concrete, consult shown in Fig. 2, when base station adopts TDD special subframe to configure 5, the time period of the 1450us-1857us from frame head can be chosen to be the second fixed time scope, wherein, 1450us is the time point alignd with GP original position in TDS frame in current TDL frame, and 1857us is GP end time point in current TDL frame.
Reason is as follows as the second fixed time scope why to choose in current TDL frame this time period of 1450us-1857us from frame head:
Consult shown in Fig. 2, under the interference of neighboring station is the prerequisite of low interference:
If neighboring station adopts TDS standard, then in this time period of 1450us-1857us, neighboring station is in GP respectively, UpPTS and descending sub frame, when neighboring station is operated in GP, because stagger in frequency from this base station (namely use different frequency ranges--industry default network criteria for planning), so interference can not be caused to base station, when neighboring station is operated in UpPTS, due to frequency staggering, so interference can not be caused to base station, when neighboring station is operated in descending sub frame, although be at transmission downstream signal, but because interference signal intensity is lower than the first threshold value, so also interference can not be caused to base station.
If neighboring station adopts TDL standard and adopt special subframe configuration 6; then in this time period of 1450us-1857us; neighboring station is in DwPTS and GP respectively, when neighboring station is operated in DwPTS, although be at transmission downstream signal; but because interference signal intensity is lower than the first threshold value; so also interference can not be caused to base station, when neighboring station is operated in GP, owing to not sending downstream signal; and have the guard time of propagation delay time, so interference can not be caused to base station.
The second way is: if base station is determined self to adopt TDD special subframe configuration 6, then base station is when determining further to include the 3rd fixed time scope in candidate time section, selected alignment time point within the 3rd fixed time, wherein, base station using the time point that aligns with sub-end position special in TDS frame in the current TDL frame starting point as the 3rd fixed time scope, using GP end time in current TDL frame o'clock end point as the 3rd fixed time scope.
Concrete, consult shown in Fig. 2, when base station adopts TDD special subframe to configure 6, the time period of the 1650us-1857us from frame head can be chosen to be the 3rd fixed time scope, wherein, 1650us is the time point alignd with special subframe end position in TDS frame in current TDL frame, and 1857us is GP end time point in current TDL frame.
Why to choose in current TDL frame from frame head this time period of 1650us-1857us as the 3rd fixed time scope, instead of adopt 1650us-1857us, consider under base station adopts the application scenarios of special subframe configuration 6, likely can there is delay phenomenon in neighboring station signal, in order to avoid deferred message impacts base station, therefore, the original position of the first fixed time scope is postponed 200us, further, select this time period of 1650us-1857us as the 3rd fixed time scope, reason is as follows:
Consult shown in Fig. 2, under the interference of neighboring station is the prerequisite of low interference:
If neighboring station adopts TDS standard, then in this time period of 1650us-1857us, neighboring station is in descending sub frame, when neighboring station is operated in descending sub frame, although be at transmission downstream signal, due to frequency staggering, and interference signal intensity is lower than the first threshold value, so also interference can not be caused to base station.
If neighboring station adopts TDL standard and adopt special subframe configuration 5, then in this time period of 1650us-1857us, neighboring station is in GP; when neighboring station is operated in GP; owing to not sending downstream signal, and there is the guard time of propagation delay time, so interference can not be caused to base station.
Based on above-described embodiment, further, if base station filters out interference signal intensity lower than after the candidate time section of pre-determined threshold within the first fixed time, TDD special subframe configuration 5 self is adopted if determine, and determine further in this candidate time section, not include above-mentioned second fixed time scope, or, TDD special subframe configuration 6 self is adopted if determine, and determine further in this candidate time section, not include above-mentioned 3rd fixed time scope, then after determining to include the 4th fixed time scope in this candidate time further, selected alignment time point within the 4th fixed time, wherein, so-called 4th fixed time scope refers to the time period in the first fixed time scope except the second fixed time scope and the 3rd fixed time scope.
Such as, consult shown in Fig. 2, when base station is determined self to have employed special subframe configuration 5, but the interference signal on this time period of the 1450us-1857us from TDL frame head is higher than pre-determined threshold (namely the second fixed time scope does not belong to candidate time section), then can judge that whether interference signal on this time period of 1857us-2000us that TDL frame head starts is higher than above-mentioned pre-determined threshold further, when determining that this time period of 1857us-2000us is in low disturbance state (the 4th fixed time scope belongs to candidate time section), therefrom selected alignment time point.
Again such as, consult shown in Fig. 2, when base station is determined self to have employed special subframe configuration 6, but the interference signal on this time period of the 1650us-1857us from TDL frame head is higher than pre-determined threshold (namely the 3rd fixed time scope does not belong to candidate time section), then can judge that whether interference signal on this time period of 1857us-2000us that TDL frame head starts is higher than above-mentioned pre-determined threshold further, when determining that this time period of 1857us-2000us is in low disturbance state (the 4th fixed time scope belongs to candidate time section), therefrom selected alignment time point.
Further, consult shown in Fig. 2, if the 4th fixed time scope is the 1857us-2000us from TDL frame head, then this time period is the UpPTS in TDL frame, in UpPTS, by convention, terminal needs to report detection reference signal (Sounding Reference Signal to base station, SRS) signal is to detect channel status, now, base station needs to indicate each terminal to reduce SRS signal transmission power within above-mentioned 4th fixed time, and reduces the SRS expectation received power of self.
Except above-mentioned various situation, further, if neighboring station causes moderate interference or high interference within the first fixed time, namely the candidate time section of interference signal intensity lower than pre-determined threshold cannot be filtered out within the scope of the first fixed time, so, the first fixed time section just can only be abandoned in base station, regular upstream subframe then after the first fixed time section selectes alignment time point, preferably, base station needs to select the regular upstream subframe not carrying Physical Random Access Channel (Physical Random Access Channel, PRACH) and SRS signal.
Such as, consult shown in Fig. 2, if base station does not filter out candidate time section within the first fixed time, then can select alignment time point in first the regular upstream subframe (i.e. subframe 2) after special subframe (i.e. subframe 1).
Further, if selected alignment time point in the sub-frame of uplink of base station in current TDL frame, then Physical Uplink Shared Channel (Physical Uplink Shared Channel is not dispatched in base station on this sub-frame of uplink, PUSCH, also known as PUSCH Traffic Channel), specifically, namely be do not dispatch PUSCH Traffic Channel when arriving and including the sub-frame of uplink of selected calibration measurement point in next TDL frame, preferably, arriving in the N number of subframe before the above-mentioned sub-frame of uplink in next TDL frame, (N is setup parameter, value is positive integer, specifically depending on sub-frame configuration specification), Physical Uplink Control Channel (Physical Uplink Control Channel is not dispatched in base station yet, PUCCH, also known as PUCCH channel).This is because, in a radio frames, the instruction that the PUCCH channel that usual n-th subframe is dispatched sends is for dispatching PUSCH Traffic Channel in n-th+N number of subframe, therefore, if base station have selected alignment time point in n-th+N number of subframe, then can not dispatch PUCCH channel in the n-th subframe, accordingly, PUSCH Traffic Channel can not be dispatched in n-th+N number of subframe, like this, not service data transmission in n-th+N number of subframe that can ensure to have selected alignment time point, thus can not have an impact to calibration result.
In practical application, multiple community may be administered in base station, namely there is the community at multiple cobasis station, then base station will ensure in all communities of this locality administration, in the sub-frame of uplink of above-mentioned selected alignment time point, all do not dispatch PUSCH channel.Further, X2 interface can be adopted between base station and neighboring station to communicate, by X2 message informing operating state each other, so, in this case, base station needs on the above-mentioned sub-frame of uplink that have selected alignment time point, also not dispatch PUSCH channel by X2 interface notice neighboring station.
Based on above-described embodiment, consult shown in Fig. 4, in the embodiment of the present invention, base station comprises measuring unit 40, screening unit 41 and alignment unit 42, wherein,
Measuring unit 40, for carrying out interferometry within the scope of the first fixed time in current TDL frame, this first fixed time scope is the partial period in current TDL frame in special subframe;
Screening unit 41, for according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within the first fixed time, and selectes alignment time point in candidate time section;
Alignment unit 42, for when the alignment time in next TDL frame, point arrived, performs calibration operation.
Preferably, when carrying out interferometry within the scope of the first fixed time in current TDL frame, described measuring unit is used for:
By the time point alignd with GP original position in TDS frame in current TDL frame, as the starting point of the first fixed time scope, by special time slot end time point in current TD-LTE radio frames, as the end point of described first fixed time scope;
Interferometry is carried out within the first selected fixed time.
Preferably, screen unit 41 for:
According to the interference measurement results obtained, within the first fixed time, filter out the candidate time section of interference signal intensity lower than pre-determined threshold;
TDD special subframe configuration 5 self is adopted if determine, then when determining further to include the second fixed time scope in candidate time section, selected alignment time point within the second fixed time, wherein, screening unit 41 using the time point that aligns with GP original position in TDS frame in the current TDL frame starting point as the second fixed time scope, using GP end time in current TDL frame o'clock end point as the second fixed time scope;
TDD special subframe configuration 6 self is adopted if determine, then when determining further to include the 3rd fixed time scope in candidate time section, selected alignment time point within the 3rd fixed time, wherein, screening unit 41 using the time point that aligns with sub-end position special in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as the 3rd fixed time scope, using GP end time in current TD-LTE radio frames o'clock end point as the 3rd fixed time scope.
Preferably, screen unit 41 to be further used for:
Self adopt TDD special subframe configuration 5 if determine and in candidate time section, do not include the second fixed time scope, or, when self adopting TDD special subframe configuration 6 if determine and do not include the 3rd fixed time scope in candidate time section, then when determining further to include the 4th fixed time scope in candidate time section, selected alignment time point within the 4th fixed time; Wherein, the 4th fixed time scope is the time period within the scope of the first fixed time except the second fixed time scope and the 3rd fixed time scope.
Base station comprises further:
First scheduling unit 43, in the process of screening unit 41 selected alignment time point in the 4th fixed time section, indicates each terminal in the 4th fixed time section, reduce the transmitting power of SRS, and reduces the SRS expectation received power of self.
Screening unit 41 is further used for:
If according to the interference measurement results obtained, do not filter out the candidate time section of interference signal intensity lower than pre-determined threshold within the first fixed time, then selected alignment time point on the sub-frame of uplink after the first fixed time scope.
Preferably, screen unit 41 for:
After the first fixed time scope, filter out the regular upstream subframe not carrying Physical Random Access Channel and SRS, and therefrom select alignment time point.
Base station comprises further:,
Second scheduling unit 44, for when screening selected alignment time point in the sub-frame of uplink of unit 41 in current TD-LTE radio frames, in all communities of this locality administration, sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before sub-frame of uplink does not dispatch Physical Uplink Control Channel.
Preferably, the second scheduling unit 44 is further used for:
Notify adjacent base station by X2 interface, the sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before sub-frame of uplink does not dispatch Physical Uplink Control Channel.
In sum, in the embodiment of the present invention, devise brand-new calibration interference and hide mechanism, base station is when entering point of selected alignment time, first within the special time, carry out interferometry, pick out the candidate time section of interference signal intensity lower than pre-determined threshold, then, pick out alignment time point at candidate time Duan Zhongzai, and carry out antenna calibration based on this alignment time point.Like this, by calculating interference, the position execution calibration operation that an annoyance level is relatively minimum can be selected, thus farthest reduce the impact disturbed and calibration factor is calculated, thus ensureing the performance of TDD base station beam excipient.
Further, if do not choose satisfactory candidate time section in special time slot, then can calibrate with regular upstream subframe scheduling, to guarantee the normal execution of calibration operation.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not depart from the spirit and scope of the embodiment of the present invention.Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (18)
1. an antenna calibration method, is characterized in that, comprising:
Interferometry is carried out within the scope of the first fixed time in current time-division Long Term Evolution TD-LTE radio frames in base station, and described first fixed time scope is the partial period in described current TD-LTE radio frames in special subframe;
Base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and selectes alignment time point in described candidate time section;
The described alignment time of base station in next TD-LTE radio frames, when putting and arrive, performs calibration operation.
2. the method for claim 1, is characterized in that, interferometry is carried out within the scope of the first fixed time in current TD-LTE radio frames in base station, comprising:
Base station by current TD-LTE radio frames with the time point protecting time slot GP original position to align in time-division duplex TD-SCDMA radio frames, as the starting point of described first fixed time scope, by special time slot end time point in current TD-LTE radio frames, as the end point of described first fixed time scope;
Interferometry is carried out in base station within the first selected fixed time.
3. method as claimed in claim 1 or 2, it is characterized in that, base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and alignment time point is selected within the described time period, comprising:
Base station, according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time;
If base station is determined self to adopt TDD special subframe configuration 5, then base station is when determining further to include the second fixed time scope in described candidate time section, selected alignment time point within described second fixed time, wherein, base station using the time point that aligns with GP original position in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described second fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described second fixed time scope;
If base station is determined self to adopt TDD special subframe configuration 6, then base station is when determining further to include the 3rd fixed time scope in described candidate time section, selected alignment time point within described 3rd fixed time, wherein, base station using the time point that aligns with sub-end position special in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described 3rd fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described 3rd fixed time scope.
4. method as claimed in claim 3, is characterized in that, comprise further:
If base station is determined self adopt TDD special subframe configuration 5 and do not include the second fixed time scope in described candidate time section, or, if when base station is determined self adopt TDD special subframe configuration 6 and do not include the 3rd fixed time scope in described candidate time section, then base station is when determining further to include the 4th fixed time scope in described candidate time section, selected alignment time point within described 4th fixed time; Wherein, described 4th fixed time scope is the time period within the scope of the first fixed time except described second fixed time scope and the 3rd fixed time scope.
5. method as claimed in claim 4, is characterized in that, comprise further:
In the process that the selected alignment time puts in the 4th fixed time section, indicate each terminal in described 4th fixed time section, reduce the transmitting power of detection reference signal SRS, and reduce the SRS expectation received power of self.
6. the method as described in any one of claim 1-5, is characterized in that, comprises further:
If base station, according to the interference measurement results obtained, does not filter out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, then selected alignment time point on the sub-frame of uplink after described first fixed time scope.
7. method as claimed in claim 6, is characterized in that, selected alignment time point on the sub-frame of uplink of base station after the first fixed time scope, comprising:
Base station, after the first fixed time scope, filters out the regular upstream subframe not carrying Physical Random Access Channel and SRS, and therefrom selectes alignment time point.
8. method as claimed in claim 6, is characterized in that, comprise further:
If selected alignment time point in the sub-frame of uplink of base station in current TD-LTE radio frames, then in all communities of this locality administration, described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
9. method as claimed in claim 8, is characterized in that, comprise further:
Base station notifies adjacent base station by X2 interface, and the described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
10. an antenna calibration equipment, is characterized in that, comprising:
Measuring unit, for carrying out interferometry within the scope of the first fixed time in current time-division Long Term Evolution TD-LTE radio frames, described first fixed time scope is the partial period in described current TD-LTE radio frames in special subframe;
Screening unit, for according to the interference measurement results obtained, filters out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, and selectes alignment time point in described candidate time section;
Alignment unit, when putting arrival for the described alignment time in next TD-LTE radio frames, performs calibration operation.
11. devices as claimed in claim 10, it is characterized in that, when carrying out interferometry within the scope of the first fixed time in current TD-LTE radio frames, described measuring unit is used for:
By in current TD-LTE radio frames with the time point protecting time slot GP original position to align in time-division duplex TD-SCDMA radio frames, as the starting point of described first fixed time scope, by special time slot end time point in current TD-LTE radio frames, as the end point of described first fixed time scope;
Interferometry is carried out within the first selected fixed time.
12. devices as described in claim 10 or 11, it is characterized in that, according to the interference measurement results obtained, the candidate time section of interference signal intensity lower than pre-determined threshold is filtered out within described first fixed time, and within the described time period during selected alignment time point, described screening unit is used for:
According to the interference measurement results obtained, within described first fixed time, filter out the candidate time section of interference signal intensity lower than pre-determined threshold;
TDD special subframe configuration 5 self is adopted if determine, then when determining further to include the second fixed time scope in described candidate time section, selected alignment time point within described second fixed time, wherein, described screening unit using the time point that aligns with GP original position in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described second fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described second fixed time scope;
TDD special subframe configuration 6 self is adopted if determine, then when determining further to include the 3rd fixed time scope in described candidate time section, selected alignment time point within described 3rd fixed time, wherein, described screening unit using the time point that aligns with sub-end position special in TD-SCDMA radio frames in the current TD-LTE radio frames starting point as described 3rd fixed time scope, using GP end time point in current TD-LTE radio frames as the end point of described 3rd fixed time scope.
13. devices as claimed in claim 12, it is characterized in that, described screening unit is further used for:
Self adopt TDD special subframe configuration 5 if determine and do not include the second fixed time scope in described candidate time section, or, when self adopting TDD special subframe configuration 6 if determine and do not include the 3rd fixed time scope in described candidate time section, then when determining further to include the 4th fixed time scope in described candidate time section, selected alignment time point within described 4th fixed time; Wherein, described 4th fixed time scope is the time period within the scope of the first fixed time except described second fixed time scope and the 3rd fixed time scope.
14. devices as claimed in claim 13, is characterized in that, comprise further:
First scheduling unit, for in the process of described screening unit selected alignment time point in the 4th fixed time section, indicate each terminal in described 4th fixed time section, reduce the transmitting power of detection reference signal SRS, and reduce the SRS expectation received power of self.
15. devices as described in any one of claim 10-14, it is characterized in that, described screening unit is further used for:
If according to the interference measurement results obtained, do not filter out the candidate time section of interference signal intensity lower than pre-determined threshold within described first fixed time, then selected alignment time point on the sub-frame of uplink after described first fixed time scope.
16. devices as claimed in claim 15, is characterized in that, on the sub-frame of uplink after the first fixed time scope during selected alignment time point, described screening unit is used for:
After the first fixed time scope, filter out the regular upstream subframe not carrying Physical Random Access Channel and SRS, and therefrom select alignment time point.
17. devices as claimed in claim 15, is characterized in that, comprise further:,
Second scheduling unit, for when in the sub-frame of uplink of described screening unit in current TD-LTE radio frames during selected alignment time point, in all communities of this locality administration, described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
18. devices as claimed in claim 17, it is characterized in that, described second scheduling unit is further used for:
Notify adjacent base station by X2 interface, the described sub-frame of uplink in next TD-LTE radio frames does not dispatch Physical Uplink Shared Channel, and N number of subframe before described sub-frame of uplink does not dispatch Physical Uplink Control Channel.
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| CN104811255B (en) | 2017-06-23 |
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