CN104105100A - Downlink interference elimination method and system based on pseudo random sub-channel selection strategy - Google Patents
Downlink interference elimination method and system based on pseudo random sub-channel selection strategy Download PDFInfo
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Abstract
The invention provides a downlink interference elimination method and system based on a clustering pseudo random sub-channel selection strategy; the method comprises the following steps: step 1: cluster generation: a terminal measures a reference signal, than determines mutual interference intensity between household base stations according to measured a physics value, employs the mutual interference intensity to generate an interference pattern, and each sub-pattern in the interference pattern is a cluster; step 2: pseudo random sub-channel selection: selects a pseudo random sub-channel in each cluster, and each household base station employs a RS pseudo random sequence to randomly generate the pseudo random sequence for communication. The method and system can greatly improve system throughput and femto UE signal to noise ratio, and can effectively reduce same-layer and cross-layer interferences.
Description
Technical field
The present invention relates to the RRM field of heterogeneous network, relate in particular to a kind of descending interference elimination method and system based on sub-clustering pseudorandom subchannel selection strategy.
Background technology
Have statistics to show, following 80%～90% throughput of system will occur in indoor and focus scene.But traditional Cellular Networks technology has " heavy outdoor, gently indoor; Heavy beehive net, light isolated hot spots; Heavily mobile switch, gently fix nomadic " etc. feature, so one of the focus of 3GPP LTE Advanced is just being optimized with focus scene indoor.Wherein heterogeneous network (Heterogeneous Networks, HetNet) can meet LTE Advanced requirement well.In 3GPP HetNet scheme, introduced the transmitting node less with respect to traditional cell base station transmitting power, comprise Pico cell (Picocell), femtocell (Femtocells) and for relay station (Relay) of signal relaying etc., wherein femtocell scheme (Femtocell) has advantage most.
Femtocell is a kind of base station equipment being applied under family's indoor environment, working environment or other little overlay environments, be called again Home eNodeB, it is based on lP broadband technology, by broadband connections such as LAN (local area network (LAN)), ADSL (ADSL (Asymmetric Digital Subscriber Line)), to Internet., is connected to the core network of operator by special circuit again.Femtocell is by broadband accesss such as existing ADSL, LAN, can make operator that high data rate, attractive business are more cheaply provided more.But Home eNodeB is to be disposed by user oneself, configuration automatically, and can use the frequency resource identical with original macro base station network, so and exist strong interference problem (cross-layer interference) between existing macro base station network.How to improve as much as possible throughput of system, and reduce macro base station and phase mutual interference between femto and become an important problem.Interference problem between femto and femto (disturbing with layer) is also a major issue in addition.
Existing technical scheme mainly comprises:
With frequently disposing (CFA, co-channel frequency allocation) [1]: femto can be used the whole frequency resource of macro base station, can improve to greatest extent throughput of system like this, but with the interference between frequency, comprise across once disturbing and disturbing all very serious with layer.
Fixed Frequency Assignment (DFA, dedicated frequency allocation) [2]: whole frequency band is allocated to fixing two parts, a part is left macro base station user for, part flow process femto is used, do not have phase mutual interference between the two, but resource utilization decline causes throughput of system to decline.
Component frequency distributes (PFA, partial frequency allocation) [3]: macro base station can be used whole frequency resources, and femto only can be used part resource, this scheme can reduce the interference between femto and macro base station, but the problem of disturbing with layer can not access efficient solution certainly
Dynamic frequency allocation (SSA, stochastic subchannel allocation) [4]: macro base station is used whole frequency resources, each femto in the time slot of each transmission, the random sub-channels of selecting from all channels.This scheme, when femto is more, is disturbed all very severe with layer interference and cross-layer.
In sum, the complete same frequency of CFA scheme is disposed, and with layer interference and cross-layer, disturbs all very severe; Although DFA scheme has effectively solved across once disturbing, throughput of system degradation; PFA is the half-way house of CFA and DFA, still cannot effectively solve the problem of disturbing with layer; SSA is when femto density is less, and cross-layer is disturbed and disturb with layer less, but when femto deployment density is larger, effect is undesirable.
Summary of the invention
For addressing the above problem, the invention provides a kind of descending interference elimination method and system based on sub-clustering pseudorandom subchannel selection strategy, greatly improved the signal to noise ratio of throughput of system and femto UE, and can effectively reduce with layer and cross-layer and disturb.
For achieving the above object, the invention provides a kind of descending interference elimination method based on sub-clustering pseudorandom subchannel selection strategy, the method comprises:
Step 1, bunch generation: terminal is carried out reference signal measurement, according to the physical values measuring, determines the mutual interference strength between Home eNodeB, utilizes described in this interference strength mutually to generate interference figure, and each subgraph in wherein said interference figure is one bunch;
Step 2, the selection of pseudorandom subchannel: carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
Further, in described step 1:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
Further, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
Further, described step 2 comprises:
Step 21, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
Step 22, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Step 23, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
Further, in described step 2:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
For achieving the above object, the present invention also provides a kind of descending interference cancelling system based on sub-clustering pseudorandom subchannel selection strategy, and this system comprises:
Bunch generation module: for carrying out reference signal measurement by terminal, according to the physical values measuring, determine the mutual interference strength between Home eNodeB, utilize described in this interference strength mutually to generate interference figure, each subgraph in wherein said interference figure is one bunch;
The selection module of pseudorandom subchannel: for carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
Further, in the generation module of described bunch:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
Further, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
Further, the selection module of described pseudorandom subchannel comprises:
RS pseudo random sequence number computing module, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
RS pseudo random sequence determination module, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Communication module, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
Further, in the selection module of described pseudorandom subchannel:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
Beneficial functional of the present invention is, has greatly improved the signal to noise ratio of throughput of system and femto UE, and can effectively reduce with layer and cross-layer and disturb.
Below in conjunction with the drawings and specific embodiments, describe the present invention, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is the descending interference elimination method flow chart based on sub-clustering pseudorandom subchannel selection strategy of the present invention;
Fig. 2 is the descending interference cancelling system schematic diagram based on sub-clustering pseudorandom subchannel selection strategy of the present invention;
Fig. 3 be interference figure of the present invention and bunch generation schematic diagram;
Fig. 4 is that femto subchannel of the present invention is selected schematic diagram at random.
Embodiment
Fig. 1 is the descending interference elimination method flow chart based on sub-clustering pseudorandom subchannel selection strategy of the present invention.As shown in Figure 1, the method comprises:
Step 1, bunch generation: terminal is carried out reference signal measurement, according to the physical values measuring, determines the mutual interference strength between Home eNodeB, utilizes described in this interference strength mutually to generate interference figure, and each subgraph in wherein said interference figure is one bunch;
Step 2, the selection of pseudorandom subchannel: carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
Further, in described step 1:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
Further, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
Further, described step 2 comprises:
Step 21, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
Step 22, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Step 23, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
Further, in described step 2:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
Fig. 2 is the descending interference cancelling system schematic diagram based on sub-clustering pseudorandom subchannel selection strategy of the present invention.As shown in Figure 2, this system comprises:
Bunch generation module 100: for carrying out reference signal measurement by terminal, according to the physical values measuring, determine the mutual interference strength between Home eNodeB, utilize described in this interference strength mutually to generate interference figure, each subgraph in wherein said interference figure is one bunch;
The selection module 200 of pseudorandom subchannel: for carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
Further, in the generation module 100 of described bunch:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
Further, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
Further, the selection module 200 of described pseudorandom subchannel comprises:
RS pseudo random sequence number computing module 210, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
RS pseudo random sequence determination module 220, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Communication module 230, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
Further, in the selection module 200 of described pseudorandom subchannel:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
1. generation bunch:
Except considering the phase mutual interference between femto user and macro base station user, if two close femto have generated identical RS sequence, between femto user and adjacent femto base station, will there is serious descending co-channel interference, appearance for fear of this situation, be necessary according to the disturbed condition between femto user and neighbours' femto base station the RS formation sequence of restriction femto.
In order to limit femto with the interference between layer, the femto each other with strong interference can not distribute identical RS sequence, so be necessary according to the mutual disturbed condition between femto, generate interference figure, wherein each subgraph is one bunch.In identical bunch, two users of interconnecting line can not distribute same RS sequence.Between bunch, can use identical RS sequence.
(1). for the disturbed condition between femto, can describe by interference figure.Node in interference figure represents femto base station, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, show that user under this femto i has been subject to disturbing from femto base station j is strong, will between node i in interference figure and node j, with segment link, get up.For example: in figure, between node 1 and node 3, with segment link, get up, represent that the user under femto1 can be subject to the strong interference of femto3 or the strong interference that the user under femto3 can be subject to femto1.
(2), after obtaining interference figure, interference figure comprises some subgraphs.Each subgraph has of one's own between node any in an integral body and other subgraph does not have line.Each subgraph comprising in interference figure is called as one independently femtocell bunch (cluster).For example, interference figure below has been divided into 3 subgraphs, and each subgraph is referred to as a femtocell bunch.Three subgraphs in figure below are labeled as respectively femetocell cluster1, femtocell cluster2 and femtocell cluester3.
2. the selection of pseudorandom subchannel:
The in the situation that of femto user and the shared same frequency of macro base station user, because macro base station user has higher priority, can use whole frequency resources.In order to avoid to greatest extent femto for macro base station user's interference, each femto adopts Reed Solomon (RS) pseudo random sequence to come random formation sequence to decide its scheduling in time/frequency source block in the selection of subchannel.For example: certain femto party A-subscriber utilize RS Sequence Generation Algorithm can generate 1 RS pseudo random sequence 8, Isosorbide-5-Nitrae, 2,7,9,3,5,8,5,2,9}, femto A communicates the frequency resource block by corresponding at different time-gap.
RS sequence is a kind of pseudo random sequence, and the method for its generation has a variety of, has only utilized the pseudo-random characteristics of RS sequence here.
Fig. 4 is that femto subchannel of the present invention is selected schematic diagram at random.As shown in Figure 4: macro base station user can use whole time frequency resource block, and femto user utilizes RS sequence, optionally at different time-gap, on different frequency, communicate, on time slot 1-12 successively in frequency 8,1,4,2,7,9,3,5,8, on 5,2,9 with the femto base station communication of its ownership.
In each bunch, carry out the selection of pseudorandom subchannel, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
Comprise A, B two steps:
The calculating of the pseudo random sequence number in A bunch on each femto
The disturbed condition from other femto that the RS sequence number (can be understood as subchannel number) that can use on each femto is subject to it is relevant, and the macro base station user's who simultaneously around exists with this femto number is relevant.Because this femto with its adjacent other femto that have severe jamming, and macro base station user can not use identical RS sequence, otherwise, will there is serious interference.
Suppose that all available RS sequence numbers are Num, and the number of degrees of femto i being recorded as deg (i). the RS sequence number that each node in initial cluster is set is RS_femto_i=Num.
The computational methods of the pseudo random sequence number in being below bunch on femto
1. in selecting bunch, the node of number of degrees maximum, is designated as femto_max, is that it distributes RS sequence number RS_femto_max=min (RS_femto_max, ceil(Num/ (deg (i)+1))).Ceil represents to round operation.Find out other nodes that connect each other with this node, be designated as femto_seri.The degree of statistics between femto_max and coupled these nodes, is recorded as deg (femto_seri_i);
2. for certain node in femto_seri, be its first sub-distribution floor((Num-RS_femto_max)/(deg (femto_seri_i)+1)), under floor represents, round operation;
By in femto_seri, select with femto_max and femto_seri in node beyond femto node have the node of line, leave in femto_seri_outer, all the other nodes leave in femto_seri_inner.Node in femto_seri_outer is retained.RS_femto_i=min (RS_femto_i, the resource number of first sub-distribution); Otherwise forward 4 to
4, calculate each node in femto_seri_inner.The RS sequence sum taking that solves other nodes in the femto_seri with this femto phase line, deducts this summation with Num, is designated as sy.On the basis of just sub-distribution, for this femto adds sy RS sequence, calculate min(RS_femto_i, first sub-distribution+sy).
5, by the node in femto_seri_inner and femto_max from bunch leave out.
If also have node in bunch, turn back to the 1st step, otherwise to the 6th step.
6, add up each femto RS sequence number that macro base station user uses around, be recorded as RS_mac_femto_i, the final RS sequence number of distributing of femto i is RS_femto_i=min(Num-RS_mac_femto_i, RS_femto_i); Finish
Be exemplified below:
Fig. 3 be interference figure of the present invention and bunch generation schematic diagram.As shown in Figure 3:
In bunch 1, one has 1,2,3,4,6,9 six nodes, wherein first the number of degrees deg (femto_max)=4 of node femto_max=3, be node 3 distribution RS_femto_max=min(32, ceil(32/5))=7 RS sequences.Wherein ceil rounds operation on being.Node with node 3 interconnecting lines is formed to femto_serial={1,6,2,9} simultaneously; The degree that calculates the interconnecting line between node in femto_serial, wherein the number of degrees in subgraph are followed successively by { 1,1,0,0};
For { 1; 2; 6; the RS sequence number of just sub-distribution of 9} is RS_femto_1=floor{ (32-7)/2}=12; RS_femto_6=floor{ (32-7)/2}=12; RS_femto_2=floor{ (32-7)/1}=25, RS_femto_9=floor{ (32-7)/1}=25 wherein floor rounds operation under being;
Due to the node in 1,2,6,9} 2} only with node 3 and the node outside 1,2,6,9} is by line, thus femto_seri_inner={1,6,9}, femto_seri_outer={2}. retains node 2.To be for the first time the resource min{32 that node 2 distributes, 12}=12.
For the node in femto_seri_inner, node 1, the shared resource summation of the node of coupled line (comprising oneself) is: so 7+12+12=31 surplus resources number is 1, the resource number of distributing for node 1 is increased to 13: in like manner can obtain the resource summation shared with the node of node 6 interconnecting lines is that 13+12+7=32 and node 9 resource numbers are 25+7=32, residue is all 0, so the resource number of node 6 and 9 is constant; By node, { 1,6,9} and node 3 are left out from bunch 1 afterwards.Residue { two nodes of 2,4} in such bunch 1.
Therefrom select the node femto_max=2 of number of degrees maximum, deg (femto_max)=1; The RS sequence number RS_femto_2=min{12 distributing for femto_2,32/2}=12; The node connecting each other with it is 4, for the resource number of its just sub-distribution is RS_femto_4=32-12/1}=20.Resource to node 4 is adjusted, and finds constant.Afterwards by node 2 and node 4 from bunch delete.
In this master drawing, there is no node.Forward step 6 to.
Add up the shared RS sequence number of macro base station user that each femto i exists around, from total RS sequence, deduct, be available RS sequence number.RS_femto_i last and above gets the RS sequence number that minimum value obtains the final distribution on femtoi.
In B bunch, the upper pseudo random sequence of each femto determines
Femto i generates at random step 1 and calculates RS_femto_i RS sequence, the femto base station of other in the form by broadcast is transferred to the subscript of the RS sequence of own use (the RS sequence that RS sequence subscript can only sign be used) bunch.
Each femto in bunch checks the RS sequence subscript that it disturbs other femto in list, if its RS sequence subscript of those RS sequence subscripts is different, in communication, adopts the RS sequence generating to communicate by letter afterwards.
If certain the femto m in interference list has the individual identical RS subscript of k with femto n, and n>m, this femto n needs again to generate at random RS sequence, and select all different RS sequences of k and femto m, afterwards, by the form of broadcast, this information is notified to other femto.
Repeat process above, until in each bunch, two femto of phase mutual interference have different RS sequences.All femto transmit in corresponding RS sequence afterwards.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the descending interference elimination method based on sub-clustering pseudorandom subchannel selection strategy, is characterized in that, comprising:
Step 1, bunch generation: terminal is carried out reference signal measurement, according to the physical values measuring, determines the mutual interference strength between Home eNodeB, utilizes described in this interference strength mutually to generate interference figure, and each subgraph in wherein said interference figure is one bunch;
Step 2, the selection of pseudorandom subchannel: carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
2. descending interference elimination method as claimed in claim 1, is characterized in that, in described step 1:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
3. descending interference elimination method as claimed in claim 1, is characterized in that, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
4. descending interference elimination method as claimed in claim 1, is characterized in that, described step 2 comprises:
Step 21, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
Step 22, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Step 23, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
5. descending interference elimination method as claimed in claim 1, is characterized in that, in described step 2:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
6. the descending interference cancelling system based on sub-clustering pseudorandom subchannel selection strategy, is characterized in that, comprising:
Bunch generation module: for carrying out reference signal measurement by terminal, according to the physical values measuring, determine the mutual interference strength between Home eNodeB, utilize described in this interference strength mutually to generate interference figure, each subgraph in wherein said interference figure is one bunch;
The selection module of pseudorandom subchannel: for carry out the selection of pseudorandom subchannel in each bunch, each Home eNodeB adopts RS pseudo random sequence to generate at random pseudo random sequence and communicates.
7. descending interference cancelling system as claimed in claim 6, is characterized in that, in the generation module of described bunch:
In identical bunch, two users of interconnecting line can not distribute same RS sequence, can use identical RS sequence between bunch.
8. descending interference cancelling system as claimed in claim 6, is characterized in that, described interference figure is obtained by following mode:
Home eNodeB femto is as the node in interference figure, certain user under femto i measures the RSRP value from femto j base station, when this value is greater than the given threshold value of system, user under this femto i is subject to disturbing from femto base station j, will between node i in interference figure and node j, with segment link, get up, femto i lists femto j in its interference list in simultaneously.
9. descending interference cancelling system as claimed in claim 6, is characterized in that, the selection module of described pseudorandom subchannel comprises:
RS pseudo random sequence number computing module, the RS pseudo random sequence number in compute cluster on each Home eNodeB, other Home eNodeB in the subscript of the RS pseudo random sequence that then described each Home eNodeB can only sign by it sends to bunch;
RS pseudo random sequence determination module, determines the RS pseudo random sequence on each Home eNodeB in described bunch: described each Home eNodeB is watched its subscript of disturbing the RS pseudo random sequence of other Home eNodeB in list,
If the subscript of the RS pseudo random sequence of described other Home eNodeB is all different, communication adopts the RS pseudo random sequence generating;
If there is identical RS pseudo random sequence subscript in any two Home eNodeB in interference list, again generate at random RS pseudo random sequence, until two of phase mutual interference Home eNodeB RS pseudo random sequence subscripts are all not identical in each bunch, then adopt the RS pseudo random sequence regenerating to communicate;
Communication module, will determine that in described bunch, the RS pseudo random sequence on each Home eNodeB is notified to other Home eNodeB by the form of broadcast, and then all Home eNodeB transmit in corresponding RS pseudo random sequence.
10. descending interference cancelling system as claimed in claim 6, is characterized in that, in the selection module of described pseudorandom subchannel:
By the subscript of described pseudo random sequence, the form by broadcast transfers out each Home eNodeB, and wherein the macro base station user in Home eNodeB can use whole time frequency resource block.
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| CN112770385A (en) * | 2020-12-29 | 2021-05-07 | 海能达通信股份有限公司 | Signal transmission method, base station, terminal and computer storage medium |
| CN112954763A (en) * | 2021-02-07 | 2021-06-11 | 中山大学 | WSN clustering routing method based on goblet sea squirt algorithm optimization |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486767A (en) * | 2014-12-12 | 2015-04-01 | 重庆邮电大学 | Cluster-based dynamic ABS interference rejection method in heterogeneous cellular network |
| CN104486767B (en) * | 2014-12-12 | 2017-12-08 | 重庆邮电大学 | Dynamic ABS disturbance restraining methods based on sub-clustering in isomery cellular network |
| CN108235440A (en) * | 2018-03-20 | 2018-06-29 | 山东大学 | Frequency spectrum resource allocation method and system based on interference threshold in Femtocell networks |
| CN108235440B (en) * | 2018-03-20 | 2020-11-06 | 山东大学 | Spectrum resource allocation method and system based on interference threshold in Femtocell network |
| CN112770385A (en) * | 2020-12-29 | 2021-05-07 | 海能达通信股份有限公司 | Signal transmission method, base station, terminal and computer storage medium |
| CN112954763A (en) * | 2021-02-07 | 2021-06-11 | 中山大学 | WSN clustering routing method based on goblet sea squirt algorithm optimization |
| CN112954763B (en) * | 2021-02-07 | 2022-12-23 | 中山大学 | WSN clustering routing method based on goblet sea squirt algorithm optimization |
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