CN104469824A - Interference eliminating method and system for TD-LTE network - Google Patents
Interference eliminating method and system for TD-LTE network Download PDFInfo
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- H04W24/02—Arrangements for optimising operational condition
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
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Abstract
The invention relates to an interference eliminating method and system for a TD-LTE network. The interference eliminating method for the TD-LTE network comprises the steps that a certain uplink subframe in a flexible subframe set is selected for configuration according to the current uplink and downlink time slot configuration, an adjacent cell which disturbs the network most seriously is selected according to reference signal receiving powers, from adjacent cells, measured by eNB, UE is configured for conducting RRM measurement on the selected adjacent cell, and the UE with the highest SRP is selected; if the current subframe of the eNB is a downlink subframe in the flexible subframe set, whether the selected adjacent cell is an uplink subframe or a downlink subframe at the moment is judged, and if the selected adjacent cell is a downlink subframe at the moment, transmitting power of the current downlink subframe is lowered through the eNB according to a preset criterion. According to the interference eliminating method and system for the TD-LTE network, the cross interference eliminating effect is good, and the method and system are easy to obtain.
Description
Technical field
The technical field that the present invention relates to is wireless communication system, and more specifically, what the present invention relates to is the method for the cross jamming eliminated in TD-LTE network.
Background technology
Along with the development of current 4G technology, each operator also starts to dispose TD-LTE network, due to the up-downgoing asymmetric design of TD-LTE, for TD-LTE network provides some distinctive functions, better can play the advantage of TD-LTE network, but also there is the distinctive problem of some TD-LTE networks simultaneously and need to solve.
TD-LTE network Essential Terms of being correlated with are as follows:
Concise and to the point introduction is carried out to TD-LTE below.
TD-LTE uplink and downlink timeslot configures:
For TD-LTE, provide 7 kinds of uplink and downlink timeslot configurations flexibly, form 1 is shown in concrete configuration.Wherein D represents descending sub frame, and U represents sub-frame of uplink, and S represents special subframe.Wherein, special subframe can transmitting downlink data, thinks the same with the transmission direction of descending sub frame, therefore in follow-up describing, mentions special subframe no longer separately, descending sub frame and special subframe are referred to as descending sub frame.For different business scenarios, different uplink and downlink timeslot configurations can be chosen flexibly, downlink business such as when certain community is more, then can choose configuration 5, there is provided more descending sub frame for transmitting downlink business, if when the uplink service of certain community is more, then configuration 0 can being chosen, providing more sub-frame of uplink for transmitting uplink service.
Table 1 TDD uplink and downlink timeslot configures
Have 10 subframes in a radio frames, the subframe of subframe numbers 0,1,2,3,4,5,6,7,8,9 is designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively.
Cross jamming:
When the uplink and downlink timeslot configuration that different TD-LTE base station applies is different, the disturbed condition of network can be more complicated, will introduce new interference type.Be described in detail for Fig. 1 below.
When eNB1 application uplink and downlink timeslot configuration 1, eNB2 application uplink and downlink timeslot configuration 2, when SF#3 and SF#8, the up transmission of the UE2 of eNB1 can produce interference to the downlink reception of the UE3 of eNB2, and descending transmission of the UE4 of eNB2 can produce interference to the UE1 uplink receiving of eNB1 simultaneously.Namely, when different eNB applies different uplink and downlink timeslot configurations, eNB can be produced to eNB, the UE interference to UE in some subframe.Therefore, defining eNB is cross jamming to eNB, UE to the interference of UE.When different eNB applies identical uplink and downlink timeslot configuration, then there is not cross jamming, when different eNB applies different uplink and downlink timeslot configurations, then there is cross jamming.
Dynamic TDD:
The system information that eNB sends carries uplink and downlink timeslot configuration information, and UE obtains the uplink and downlink timeslot configuration of eNB application by the system information receiving eNB transmission.If eNB changes uplink and downlink timeslot configuration, then pass through the change process of system information by new uplink and downlink timeslot configuration notification UE.Consider that the change process required time of system information is longer, in order to better play the advantage of the different uplink and downlink timeslot configuration of TD-LTE, TD-LTE introduces the function of dynamic TDD.For dynamic TDD function, namely support that eNB changes uplink and downlink timeslot configuration fast, such as 10ms changes once, and by uplink and downlink timeslot configuration notification UE that eNB applies by physical layer signaling.
After eNB applies dynamic TDD function, the fast-changing demand of business can be better met, but due to different eNB uplink and downlink timeslot configuration different, therefore also bring cross jamming.According to 7 kinds of uplink and downlink timeslot configurations of TDD, generally all subframes can be divided into two classes, namely fix subframe and flexible sub-frame.Fig. 2 describes the distribution of fixing subframe and flexible sub-frame.For fixing subframe, no matter namely which kind of uplink and downlink timeslot configuration eNB applies, the transmission direction of this subframe is fixing, and such as subframe 0 is fixed as descending sub frame, and subframe 2 is fixed as sub-frame of uplink; For flexible sub-frame, namely when eNB applies different uplink and downlink timeslot configurations, the transmission direction of this subframe can change, such as subframe 3, when configuring 0 for uplink and downlink timeslot, this subframe is sub-frame of uplink, when configuring 2 for uplink and downlink timeslot, this subframe is descending sub frame.Therefore fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9.
Therefore, when being in flexible sub-frame set, may produce cross jamming, namely eNB is to the interference of eNB, and UE is to the interference of UE.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides and a kind ofly eliminate the technical scheme of eNB to eNB cross jamming.
Technical scheme of the present invention provides a kind of interference elimination method for TD-LTE network, comprises and performs following steps based on eNB:
Step one, according to current uplink and downlink timeslot configuration categories, eNB chooses certain sub-frame of uplink in flexible sub-frame set; If 10 subframes in a radio frames are designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively, fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9, comprises for often kind of TDD uplink and downlink timeslot configuration, chooses sub-frame of uplink as follows,
Configuration 0, SF#9
Configuration 1, SF#8
Configuration 2, SF#7
Configuration 3, SF#4
Configuration 4, SF#3
Configuration 6, SF#4 or SF#8
Configuration 5, when eNB is configuration 5, waits for that changing to other configurations carries out corresponding choosing again;
Step 2, in the some radio frames preset, eNB is configured the sub-frame of uplink that step one is chosen, all UE that eNB is served can not send any data at corresponding sub-frame of uplink, the received power of the reference signal that the community that eNB measures in Neighboring Cell List at corresponding sub-frame of uplink sends also is averaged, and chooses the maximum adjacent cell of Reference Signal Received Power for most strong jamming adjacent cell;
Step 3, all UE of eNB configuration service carry out RRM measurement to the most strong jamming adjacent cell that step 2 is chosen, and the RSRP measurement result to most strong jamming adjacent cell that eNB reports according to UE chooses the UE that RSRP is maximum;
Step 4, the UE that eNB configuration step three is chosen feeds back SF#0 respectively, and SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set, and eNB records the CQI of the above-mentioned subframe of UE feedback respectively;
Step 5, eNB judges whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set, if the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, eNB carries out sum-average arithmetic to the CQI of SF#0 and SF#1 of step 4 record, is designated as CQI1; ENB carries out sum-average arithmetic to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of step 4 record is in flexible sub-frame set simultaneously, be designated as CQI2, if the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, the most strong jamming adjacent cell then thinking that step 2 chooses is now sub-frame of uplink, enters step 6; Otherwise the most strong jamming adjacent cell thinking that step 2 chooses is now descending sub frame, directly enters step 8;
If eNB present sub-frame is the descending sub frame in fixing sub-frame set, directly carry out step 8;
If not, then eNB receives data and waits for, until carry out above operation again when present sub-frame is descending sub frame;
Step 6, eNB reduces the transmitting power of present sub-frame according to following criterion, consider that flexible sub-frame is that the uplink and downlink timeslot configuration of sub-frame of uplink is than row, the descending sub frame of all flexible sub-frame set is divided into three set, comprise set 1{SF#3, SF#7}, set 2{SF#4, SF#8} and set 3{SF#9};
Compared to the transmitting power of eNB at the descending sub frame of fixing sub-frame set, for the descending sub frame of set 1, set 2, set 3, corresponding different transmitting power is had to reduce scheme respectively; The transmitting power of the corresponding reduction present sub-frame of the set of eNB belonging to present sub-frame;
Step 7, reduces transmitting power for step 6 at present sub-frame, and eNB makes corresponding restriction, process ends;
Step 8, eNB sends data at present sub-frame with normal power, process ends.
And, for the descending sub frame of set 1, set 2, set 3, it is as follows that corresponding different transmitting power reduces scheme, with eNB in the transmitting power of the descending sub frame of fixing sub-frame set for normal power, for the descending sub frame of set 1, the transmitting power of eNB is reduced to 1/4 of normal power, for the descending sub frame of set 2, the transmitting power of eNB is reduced to 1/3 of normal power, and for the descending sub frame of set 3, the transmitting power of eNB is reduced to 1/2 of normal power.
The present invention is also corresponding provides a kind of interference cancelling system for TD-LTE network, is included in eNB and arranges with lower module:
Sub-frame of uplink chooses module, for according to current uplink and downlink timeslot configuration categories, chooses certain sub-frame of uplink in flexible sub-frame set; If 10 subframes in a radio frames are designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively, fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9, comprises for often kind of TDD uplink and downlink timeslot configuration, chooses sub-frame of uplink as follows,
Configuration 0, SF#9
Configuration 1, SF#8
Configuration 2, SF#7
Configuration 3, SF#4
Configuration 4, SF#3
Configuration 6, SF#4 or SF#8
Configuration 5, when for configuration 5, waits for that changing to other configurations carries out corresponding choosing again;
Module is chosen in community, for in the some radio frames preset, choose to sub-frame of uplink the sub-frame of uplink that module chooses to be configured, all UE that eNB is served can not send any data at corresponding sub-frame of uplink, the received power of the reference signal sent in the community that corresponding sub-frame of uplink is measured in Neighboring Cell List is also averaged, and chooses the maximum adjacent cell of Reference Signal Received Power for most strong jamming adjacent cell;
Terminal chooses module, and all UE for configuration service choose to community the most strong jamming adjacent cell that module chooses and carry out RRM measurement, according to the RSRP measurement result to most strong jamming adjacent cell that UE reports, choose the UE that RSRP is maximum;
Feedback module, chooses for configurating terminal the UE that module chooses and feeds back SF#0 respectively, and SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set, record the CQI of the above-mentioned subframe of UE feedback respectively;
Judge module, for judging whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set, if the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, sum-average arithmetic is carried out to the CQI of SF#0 and SF#1 of feedback module record, is designated as CQI1; Sum-average arithmetic is carried out to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of feedback module record is in flexible sub-frame set simultaneously, be designated as CQI2, if the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, the most strong jamming adjacent cell then thinking that community chooses that module chooses is now sub-frame of uplink, and order transmitting power adjusting module works; Otherwise the most strong jamming adjacent cell thinking that community chooses that module chooses is now descending sub frame, direct command normal transmission module work;
If the present sub-frame of eNB is the descending sub frame in fixing sub-frame set, direct command normal transmission module work;
If not, then receive data and wait for, until carry out above operation again when present sub-frame is descending sub frame;
Transmitting power adjusting module, for reducing the transmitting power of present sub-frame according to following criterion, consider that flexible sub-frame is that the uplink and downlink timeslot configuration of sub-frame of uplink is than row, the descending sub frame of all flexible sub-frame set is divided into three set, comprise set 1{SF#3, SF#7}, set 2{SF#4, SF#8} and set 3{SF#9};
Compared to the transmitting power of eNB at the descending sub frame of fixing sub-frame set, for the descending sub frame of set 1, set 2, set 3, corresponding different transmitting power is had to reduce scheme respectively; The transmitting power of the corresponding reduction present sub-frame of the set of eNB belonging to present sub-frame;
Limiting module, for reducing transmitting power for transmitting power adjusting module at present sub-frame, makes corresponding restriction, power cut-off;
Normal transmission module, for sending data at present sub-frame with normal power.
And, for the descending sub frame of set 1, set 2, set 3, it is as follows that corresponding different transmitting power reduces scheme, with eNB in the transmitting power of the descending sub frame of fixing sub-frame set for normal power, for the descending sub frame of set 1, the transmitting power of eNB is reduced to 1/4 of normal power, for the descending sub frame of set 2, the transmitting power of eNB is reduced to 1/3 of normal power, and for the descending sub frame of set 3, the transmitting power of eNB is reduced to 1/2 of normal power.
Contrast prior art, the present invention proposes a kind of scheme reducing TD-LTE network cross jamming, for often kind of uplink-downlink configuration, chooses specified upstream subframe according to criterion; All UE that eNB configures its service do not send data at selected sub-frame of uplink, eNB measures the received power of the reference signal that all communities send in its Neighboring Cell List at this sub-frame of uplink, and eNB is according to the selected most strong jamming adjacent cell of the Reference Signal Received Power measured; All UE that eNB configures its service carry out RRM measurement to selected most strong jamming adjacent cell, and the measurement result of the RSRP that eNB feeds back according to UE selectes the maximum UE of RSRP.The CQI of the different descending sub frames of the UE feedback that eNB configuration is selected.When eNB is in the descending sub frame in flexible sub-frame set, determine whether most strong jamming adjacent cell is sub-frame of uplink by the CQI information of the different descending sub frames of relatively selected UE feedback, if most strong jamming adjacent cell is sub-frame of uplink, the then sub-frame set of eNB residing for current downlink subframe, the transmitting power of this descending sub frame is reduced, to reduce the cross jamming produced adjacent cell according to predefined criterion.Therefore, the present invention eliminates the respond well of cross jamming, and is easy to realize.
Accompanying drawing explanation
Fig. 1 is the cross jamming schematic diagram of prior art.
Fig. 2 is fixing subframe and the flexible sub-frame schematic diagram of prior art.
Fig. 3 is the flow chart of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is described in detail.
The present invention selects specific sub-frame of uplink according to certain criterion, all UE that eNB configures its service do not send any data at this sub-frame of uplink, eNB measures at this sub-frame of uplink the received power of reference signal that adjacent cell sends, and eNB is by comparing and measuring result to determine most strong jamming adjacent cell.All UE that eNB configures its service carry out RRM measurement to this most strong jamming adjacent cell, and the measurement result of the RSRP that eNB feeds back according to UE chooses the maximum UE of RSRP.ENB configuration selected by UE feedback different descending sub frames CQI and preserve.When eNB is in the descending sub frame in flexible sub-frame set, the CQI information of the different descending sub frames fed back by the UE of more above-mentioned preservation determines whether most strong jamming adjacent cell is sub-frame of uplink, if most strong jamming adjacent cell is sub-frame of uplink, the then sub-frame set of eNB residing for current downlink subframe, the transmitting power of this descending sub frame is reduced according to predefined criterion, to reduce the cross jamming produced adjacent cell, if most strong jamming adjacent cell is not sub-frame of uplink, then eNB sends data with normal power at this descending sub frame.
During concrete enforcement, realize by adopting software mode at eNB automatically running flow process of the present invention.See Fig. 3, the technical scheme steps that embodiment is concrete is as follows:
Step one: according to current uplink and downlink timeslot configuration categories, eNB chooses certain sub-frame of uplink in flexible sub-frame set.As form 1, there are 7 kinds of uplink and downlink timeslot configurations, each uplink and downlink timeslot is configured, choose certain sub-frame of uplink in flexible sub-frame set, the selection principle of this sub-frame of uplink is: if the flexible sub-frame set of current uplink and downlink timeslot configuration only has unique sub-frame of uplink, then select this sub-frame of uplink, such as uplink and downlink timeslot configuration 4, sub-frame of uplink in flexible sub-frame set only has SF#3, then choose SF#3.If have multiple sub-frame of uplink in the flexible sub-frame set of current uplink and downlink timeslot configuration, each uplink subframe number of the flexible sub-frame set then current uplink and downlink timeslot configured, add up other 6 kinds of uplink and downlink timeslot configurations respectively and correspond to the uplink and downlink timeslot configuration quantity that this uplink subframe number is descending sub frame, choose corresponding to the maximum sub-frame of uplink of quantity.Such as, suppose that current up-downgoing is time slot configuration 1, for other 6 kinds of uplink and downlink timeslot configurations, the uplink-downlink configuration quantity being descending sub frame corresponding to SF#3 is 2, the uplink-downlink configuration quantity being descending sub frame corresponding to SF#7 is 3, the uplink-downlink configuration quantity being descending sub frame corresponding to SF#8 is 4, therefore chooses the SF#8 in flexible sub-frame set.Concrete, for often kind of TDD uplink and downlink timeslot configuration, choose following sub-frame of uplink:
-configuration 0, SF#9
-configuration 1, SF#8
-configuration 2, SF#7
-configuration 3, SF#4
-configuration 4, SF#3
-configuration 6, SF#4 or SF#8
-configuration 5, special when eNB current for configuration 5 time, there is no sub-frame of uplink in flexible sub-frame set, need wait for that eNB changes to after other configure, carry out corresponding choosing according to the configuration be changed to, then enter step 2.
Step 2: in several (the being set to m) radio frames preset, eNB is configured the sub-frame of uplink that step one is chosen, all UE that eNB is served this sub-frame of uplink chosen in m radio frames can not send any data, eNB this sub-frame of uplink chosen in m radio frames measures the reference signal that the community in its Neighboring Cell List sends respectively, eNB is averaged to the measurement result in this m radio frames, determines the Reference Signal Received Power that adjacent cell sends; The received power of the reference signal that the adjacent cell that eNB obtains according to measurement sends, choose the adjacent cell that Reference Signal Received Power is maximum, Ze Gai community is most strong jamming adjacent cell, most strong jamming adjacent cell may produce strong cross jamming to eNB, accordingly, eNB also can produce strong cross jamming to most strong jamming adjacent cell.During concrete enforcement, those skilled in the art can pre-set the value of m voluntarily, and m=2 or 3 is generally got in m >=1.
All UE that step 3: eNB configures its service carry out RRM measurement to the most strong jamming adjacent cell that step 2 is chosen, the RSRP measurement result to most strong jamming adjacent cell that eNB reports according to UE, choose the UE that RSRP is maximum, then this UE chosen may be subject to the cross jamming caused of the UE of strong most strong jamming adjacent cell service.Concrete UE performs to measure and report and is embodied as prior art, and subscriber equipment producer can integration realization.
Step 4: the UE that eNB configuration step three is chosen feeds back SF#0 respectively, SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set (SF#3, SF#4, SF#7, SF#8, SF#9), and eNB records the CQI of the above-mentioned subframe of UE feedback respectively.
Step 5: eNB judges whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set, if the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, the CQI of eNB to these two subframes of SF#0 and SF#1 of step 4 record carries out sum-average arithmetic, is designated as CQI1; ENB carries out sum-average arithmetic to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of step 4 record is in flexible sub-frame set simultaneously, is designated as CQI2.If the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, then the most strong jamming adjacent cell thinking that step 2 chooses is now sub-frame of uplink, enters step 6; Otherwise the most strong jamming adjacent cell thinking that step 2 chooses is now descending sub frame, directly enters step 8.
If eNB present sub-frame is the descending sub frame in fixing sub-frame set, directly carry out step 8.
If not, namely eNB present sub-frame is sub-frame of uplink, then eNB receives data and waits for, until carry out above operation again when the present sub-frame of eNB process is descending sub frame.
During concrete enforcement, those skilled in the art can pre-set the value of CQI_thr voluntarily.
Step 6: eNB reduces the transmitting power of present sub-frame according to following criterion:
-for 7 kinds of uplink and downlink timeslot configurations, for each subframe in flexible sub-frame set, this subframe place proportional numerical value is this subframe is the uplink and downlink timeslot configuration categories quantity of sub-frame of uplink and the ratio of uplink and downlink timeslot configuration categories sum (namely 7), such as, in 7 kinds of uplink and downlink timeslots configuration SF#3 be U have 5, so SF#3 place proportional numerical value is 5/7, and concrete each flexible sub-frame value is in table 2;
-consider that flexible sub-frame is the uplink and downlink timeslot configuration ratio row of sub-frame of uplink, according to the numerical value in table 2, the subframe of all flexible sub-frame set is divided into three set, set 1{SF#3, SF#7}, set 2{SF#4, SF#8}, set 3{SF#9};
Table 2 flexible sub-frame is that the uplink and downlink timeslot configuration of sub-frame of uplink is than row
| Configuration 0 | D | S | U | U(5/7) | U(3/7) | D | S | U(4/7) | U(3/7) | U(1/7) |
| Configuration 1 | D | S | U | U(5/7) | D(3/7) | D | S | U(4/7) | U(3/7) | D(1/7) |
| Configuration 2 | D | S | U | D(5/7) | D(3/7) | D | S | U(4/7) | D(3/7) | D(1/7) |
| Configuration 3 | D | S | U | U(5/7) | U(3/7) | D | D | D(4/7) | D(3/7) | D(1/7) |
| Configuration 4 | D | S | U | U(5/7) | D(3/7) | D | D | D(4/7) | D(3/7) | D(1/7) |
| Configuration 5 | D | S | U | D(5/7) | D(3/7) | D | D | D(4/7) | D(3/7) | D(1/7) |
| Configuration 6 | D | S | U | U(5/7) | U(3/7) | D | S | U(4/7) | U(3/7) | D(1/7) |
-for above three subframes gathered, arrange corresponding different transmitting power respectively and reduce scheme, eNB reduces different transmitting powers respectively by gathering belonging to subframe, then sends data with the transmitting power of different brackets.Those skilled in the art can arrange concrete power regulation scheme voluntarily, such as, with eNB in the transmitting power of the descending sub frame of fixing sub-frame set (SF#0, SF#1, SF#2, SF#5, SF#6) for normal power, eNB then reduces transmitting power at the descending sub frame of flexible sub-frame set, for the descending sub frame of set 1, the transmitting power of eNB is reduced to 1/4 of normal power, for the descending sub frame of set 2, the transmitting power of eNB is reduced to 1/3 of normal power, for the descending sub frame of set 3, the transmitting power of eNB is reduced to 1/2 of normal power.
In embodiment, the sub-frame set of eNB at present sub-frame, determines that the transmitting power of present sub-frame carries out corresponding reduction.
Step 7: when eNB reduces transmitting power by step 6 at present sub-frame, then eNB needs to make corresponding restriction, and such as eNB now only uses QPSK modulation system, so that UE correctly can receive data, process ends.
Step 8: eNB sends data at present sub-frame with normal power, process ends.
The present invention is also corresponding provides a kind of interference cancelling system for TD-LTE network, is included in eNB and arranges with lower module:
Sub-frame of uplink chooses module, for according to current uplink and downlink timeslot configuration categories, chooses certain sub-frame of uplink in flexible sub-frame set; If 10 subframes in a radio frames are designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively, fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9, comprises for often kind of TDD uplink and downlink timeslot configuration, chooses sub-frame of uplink as follows,
Configuration 0, SF#9
Configuration 1, SF#8
Configuration 2, SF#7
Configuration 3, SF#4
Configuration 4, SF#3
Configuration 6, SF#4 or SF#8
Configuration 5, when for configuration 5, waits for that changing to other configurations carries out corresponding choosing again;
Module is chosen in community, for in the some radio frames preset, choose to sub-frame of uplink the sub-frame of uplink that module chooses to be configured, all UE that eNB is served can not send any data at corresponding sub-frame of uplink, the received power of the reference signal sent in the community that corresponding sub-frame of uplink is measured in Neighboring Cell List is also averaged, and chooses the maximum adjacent cell of Reference Signal Received Power for most strong jamming adjacent cell;
Terminal chooses module, and all UE for configuration service choose to community the most strong jamming adjacent cell that module chooses and carry out RRM measurement, according to the RSRP measurement result to most strong jamming adjacent cell that UE reports, choose the UE that RSRP is maximum;
Feedback module, chooses for configurating terminal the UE that module chooses and feeds back SF#0 respectively, and SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set, record the CQI of the above-mentioned subframe of UE feedback respectively;
Judge module, for judging whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set, if the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, sum-average arithmetic is carried out to the CQI of SF#0 and SF#1 of feedback module record, is designated as CQI1; Sum-average arithmetic is carried out to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of feedback module record is in flexible sub-frame set simultaneously, be designated as CQI2, if the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, the most strong jamming adjacent cell then thinking that community chooses that module chooses is now sub-frame of uplink, and order transmitting power adjusting module works; Otherwise the most strong jamming adjacent cell thinking that community chooses that module chooses is now descending sub frame, direct command normal transmission module work;
If the present sub-frame of eNB is the descending sub frame in fixing sub-frame set, direct command normal transmission module work;
If not, then receive data and wait for, until carry out above operation again when present sub-frame is descending sub frame;
Transmitting power adjusting module, for reducing the transmitting power of present sub-frame according to following criterion,
Consider that flexible sub-frame is the uplink and downlink timeslot configuration ratio row of sub-frame of uplink, the descending sub frame of all flexible sub-frame set is divided into three set, comprises set 1{SF#3, SF#7}, set 2{SF#4, SF#8} and gather 3{SF#9};
Compared to the transmitting power of eNB at the descending sub frame of fixing sub-frame set, for the descending sub frame of set 1, set 2, set 3, corresponding different transmitting power is had to reduce scheme respectively; The transmitting power of the corresponding reduction present sub-frame of the set of eNB belonging to present sub-frame;
Limiting module, for reducing transmitting power for transmitting power adjusting module at present sub-frame, makes corresponding restriction, power cut-off;
Normal transmission module, for sending data at present sub-frame with normal power.
Each module realizes corresponding to method step, and it will not go into details in the present invention.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. for an interference elimination method for TD-LTE network, it is characterized in that, comprise and perform following steps based on eNB:
Step one, according to current uplink and downlink timeslot configuration categories, eNB chooses certain sub-frame of uplink in flexible sub-frame set; If 10 subframes in a radio frames are designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively, fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9, comprises for often kind of TDD uplink and downlink timeslot configuration, chooses sub-frame of uplink as follows,
Configuration 0, SF#9
Configuration 1, SF#8
Configuration 2, SF#7
Configuration 3, SF#4
Configuration 4, SF#3
Configuration 6, SF#4 or SF#8
Configuration 5, when eNB is configuration 5, waits for that changing to other configurations carries out corresponding choosing again;
Step 2, in the some radio frames preset, eNB is configured the sub-frame of uplink that step one is chosen, all UE that eNB is served can not send any data at corresponding sub-frame of uplink, the received power of the reference signal that the community that eNB measures in Neighboring Cell List at corresponding sub-frame of uplink sends also is averaged, and chooses the maximum adjacent cell of Reference Signal Received Power for most strong jamming adjacent cell;
Step 3, all UE of eNB configuration service carry out RRM measurement to the most strong jamming adjacent cell that step 2 is chosen, and the RSRP measurement result to most strong jamming adjacent cell that eNB reports according to UE chooses the UE that RSRP is maximum;
Step 4, the UE that eNB configuration step three is chosen feeds back SF#0 respectively, and SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set, and eNB records the CQI of the above-mentioned subframe of UE feedback respectively;
Step 5, eNB judges whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set,
If the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, eNB carries out sum-average arithmetic to the CQI of SF#0 and SF#1 of step 4 record, is designated as CQI1; ENB carries out sum-average arithmetic to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of step 4 record is in flexible sub-frame set simultaneously, be designated as CQI2, if the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, the most strong jamming adjacent cell then thinking that step 2 chooses is now sub-frame of uplink, enters step 6; Otherwise the most strong jamming adjacent cell thinking that step 2 chooses is now descending sub frame, directly enters step 8;
If eNB present sub-frame is the descending sub frame in fixing sub-frame set, directly carry out step 8;
If not, then eNB receives data and waits for, until carry out above operation again when present sub-frame is descending sub frame;
Step 6, eNB reduces the transmitting power of present sub-frame according to following criterion,
Consider that flexible sub-frame is the uplink and downlink timeslot configuration ratio row of sub-frame of uplink, the descending sub frame of all flexible sub-frame set is divided into three set, comprises set 1{SF#3, SF#7}, set 2{SF#4, SF#8} and gather 3{SF#9};
Compared to the transmitting power of eNB at the descending sub frame of fixing sub-frame set, for the descending sub frame of set 1, set 2, set 3, corresponding different transmitting power is had to reduce scheme respectively; The transmitting power of the corresponding reduction present sub-frame of the set of eNB belonging to present sub-frame;
Step 7, reduces transmitting power for step 6 at present sub-frame, and eNB makes corresponding restriction, process ends;
Step 8, eNB sends data at present sub-frame with normal power, process ends.
2. according to claim 1 for the interference elimination method of TD-LTE network, it is characterized in that: for the descending sub frame of set 1, set 2, set 3, it is as follows that corresponding different transmitting power reduces scheme,
With eNB in the transmitting power of the descending sub frame of fixing sub-frame set for normal power, for the descending sub frame of set 1, the transmitting power of eNB is reduced to 1/4 of normal power, for the descending sub frame of set 2, the transmitting power of eNB is reduced to 1/3 of normal power, for the descending sub frame of set 3, the transmitting power of eNB is reduced to 1/2 of normal power.
3. for an interference cancelling system for TD-LTE network, it is characterized in that, be included in eNB and arrange with lower module:
Sub-frame of uplink chooses module, for according to current uplink and downlink timeslot configuration categories, chooses certain sub-frame of uplink in flexible sub-frame set; If 10 subframes in a radio frames are designated as SF#0, SF#1, SF#2, SF#3, SF#4, SF#5, SF#6, SF#7, SF#8, SF#9 respectively, fixing sub-frame set is SF#0, SF#1, SF#2, SF#5, SF#6; Flexible sub-frame set is SF#3, SF#4, SF#7, SF#8, SF#9, comprises for often kind of TDD uplink and downlink timeslot configuration, chooses sub-frame of uplink as follows,
Configuration 0, SF#9
Configuration 1, SF#8
Configuration 2, SF#7
Configuration 3, SF#4
Configuration 4, SF#3
Configuration 6, SF#4 or SF#8
Configuration 5, when for configuration 5, waits for that changing to other configurations carries out corresponding choosing again;
Module is chosen in community, for in the some radio frames preset, choose to sub-frame of uplink the sub-frame of uplink that module chooses to be configured, all UE that eNB is served can not send any data at corresponding sub-frame of uplink, the received power of the reference signal sent in the community that corresponding sub-frame of uplink is measured in Neighboring Cell List is also averaged, and chooses the maximum adjacent cell of Reference Signal Received Power for most strong jamming adjacent cell;
Terminal chooses module, and all UE for configuration service choose to community the most strong jamming adjacent cell that module chooses and carry out RRM measurement, according to the RSRP measurement result to most strong jamming adjacent cell that UE reports, choose the UE that RSRP is maximum;
Feedback module, chooses for configurating terminal the UE that module chooses and feeds back SF#0 respectively, and SF#1 and the configuration of current uplink and downlink timeslot are in the CQI of the descending sub frame of flexible sub-frame set, record the CQI of the above-mentioned subframe of UE feedback respectively;
Judge module, for judging whether present sub-frame is descending sub frame,
If so, following operation is carried out,
ENB judges that present sub-frame is the descending sub frame that descending sub frame in flexible sub-frame set still fixes in sub-frame set, if the present sub-frame of eNB is the descending sub frame in flexible sub-frame set, sum-average arithmetic is carried out to the CQI of SF#0 and SF#1 of feedback module record, is designated as CQI1; Sum-average arithmetic is carried out to the CQI value of the descending sub frame that the current uplink and downlink timeslot configuration of feedback module record is in flexible sub-frame set simultaneously, be designated as CQI2, if the difference of CQI1 and CQI2 is greater than the threshold value CQI_thr preset, the most strong jamming adjacent cell then thinking that community chooses that module chooses is now sub-frame of uplink, and order transmitting power adjusting module works; Otherwise the most strong jamming adjacent cell thinking that community chooses that module chooses is now descending sub frame, direct command normal transmission module work;
If the present sub-frame of eNB is the descending sub frame in fixing sub-frame set, direct command normal transmission module work;
If not, then receive data and wait for, until carry out above operation again when present sub-frame is descending sub frame;
Transmitting power adjusting module, for reducing the transmitting power of present sub-frame according to following criterion,
Consider that flexible sub-frame is the uplink and downlink timeslot configuration ratio row of sub-frame of uplink, the descending sub frame of all flexible sub-frame set is divided into three set, comprises set 1{SF#3, SF#7}, set 2{SF#4, SF#8} and gather 3{SF#9};
Compared to the transmitting power of eNB at the descending sub frame of fixing sub-frame set, for the descending sub frame of set 1, set 2, set 3, corresponding different transmitting power is had to reduce scheme respectively; The transmitting power of the corresponding reduction present sub-frame of the set of eNB belonging to present sub-frame;
Limiting module, for reducing transmitting power for transmitting power adjusting module at present sub-frame, makes corresponding restriction, power cut-off;
Normal transmission module, for sending data at present sub-frame with normal power.
4. according to claim 3 for the interference cancelling system of TD-LTE network, it is characterized in that: for the descending sub frame of set 1, set 2, set 3, it is as follows that corresponding different transmitting power reduces scheme,
With eNB in the transmitting power of the descending sub frame of fixing sub-frame set for normal power, for the descending sub frame of set 1, the transmitting power of eNB is reduced to 1/4 of normal power, for the descending sub frame of set 2, the transmitting power of eNB is reduced to 1/3 of normal power, for the descending sub frame of set 3, the transmitting power of eNB is reduced to 1/2 of normal power.
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