CN101494896A - Method for coordinating interference between districts of relay wireless communication network - Google Patents
Method for coordinating interference between districts of relay wireless communication network Download PDFInfo
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Abstract
The invention discloses an inter-cell interference coordination method in relay radio communication network. wherein, the interference coordination method for base station in network comprises: A, base station selecting limited interference source; B, dividing the base station into non-interference area, transition area and limited interference source area; and seting the link loss compensation factor and time frequency resource of every layer of the base station; D, setting a first interference signal intensity contrast threshold; E, measuring the intensity of current most intensive interference signal, if the intensity is larger than the first interference signal intensity contrast threshold, notifying the current user terminal to restart the random accessing process; otherwise, the base station adjusting the emission power of relay station and user terminal in current service. The invention limits the interference to cell in a certain range, and effectively solves the problems of excessive system cost, excessive reciprocating time delay, heavy load and difficulty in guaranteeing the orthogonal of time frequency resource occupied by the interference source in full load during the inter-cell interference coordination.
Description
Technical field
The present invention relates to cordless communication network, refer more particularly to the inter-cell interference coordination method of the cordless communication network of a kind of RS of having (Relay Station, relay station).
Background technology
In follow-on broadband wireless communication network, solving presence of intercell interference in the cordless communication network becomes a key factor that improves UT (user terminal) throughput and average UT throughput in the sub-district.In having the junction network of RS, effectively solve BS (base station), RS and affiliated UT thereof and BS, the RS of adjacent sub-district and the presence of intercell interference between the UT thereof and equally also will be faced with formidable challenges.
In junction network, because RS can be used as the special UT of the subordinate BS of institute, RS self again can be the same with RS simultaneously, after subordinate BS obtains running time-frequency resource, allows the access of UT, and forming one is the junction network of the RS covering at center with RS.Therefore, solve the interference problem between BS and RS, RS and other RS, most important for the throughput and the average UT throughput that improve cell edge and RS edge UT.
At present, in IEEE 802.16j, IMT-Advanced, WINNER, all propose to adopt methods such as interference randomization, interference coordination, interference eliminated to solve the problem of area interference.The UT that gives chapter and verse among the LTE is divided into internal layer and skin to the strong jamming level of all neighbor cells with cell coverage area, and adopts the method for control of part power and path loss compensation to solve presence of intercell interference.Wherein, internal layer is the zone that does not have area interference, uses the total power compensation; And outer zone for having area interference, the method that adopts control of part power and path loss to compensate solves the problem of presence of intercell interference.
Adopt the control of part power and the path loss compensation method of layering, light or when be the span load when the load in the cordless communication network, can guarantee the employed running time-frequency resource of each neighbor cell, i.e. PRB (Physical Resource Block) maintenance quadrature.But, when load is heavier, then be difficult to guarantee that by scheduling employed running time-frequency resource keeps quadrature between all neighbor cells, though can distinguish the complete quadrature of collision probability the best part in the running time-frequency resource of neighbor cell use by the sensitizing range is set, but reduced the flexibility of scheduling, and when control of part power and path loss compensation, the availability of frequency spectrum is descended, caused the throughput of cell edge UT and the decline of UT average throughput.In like manner, in having the cordless communication network of RS, when load is heavier, the running time-frequency resource maintenance quadrature of the running time-frequency resource that also be difficult to guarantee RS and attached UT thereof and other RS and attached UT thereof, though be provided with the sensitizing range, can reduce dispatching flexibility and when control of part power and path loss compensation, the availability of frequency spectrum be descended.
Summary of the invention
Technical problem to be solved by this invention provides a kind of inter-cell interference coordination method of relay wireless communications network, and the availability of frequency spectrum when solving control of part power in the prior art and path loss compensation effectively descends and load problem such as dispatching flexibility reduction when heavier.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
A kind of the method for Inter-Cell Interference Coordination is carried out in the overlay area of base station, may further comprise the steps:
A, base station sets limited interference source select threshold value one, select the interference base station of adjacent sub-district and relay station as its limited interference source according to this threshold value;
B, base station are provided with its area dividing threshold value according to described limited interference source, according to this threshold value the overlay area of base station are divided into three layers: noiseless zone, transition region and limited interference source zone;
C, base station dispose road loss compensation factor and running time-frequency resource according to described limited interference source respectively for its each layer, and described road loss compensation factor is used to control the up-link transmission power of its equivalent layer;
D, setting first interference signal intensity contrast threshold one;
E, measure current high reject signal intensity,, restart the process that inserts at random if this intensity greater than described first interference signal intensity contrast threshold one, is then notified active user's terminal to disconnect and connected; Otherwise the road loss compensation factor tabulation of the employed hierarchical lists of the relay station of base station sets current service and each layer is adjusted the relay station of current service and the transmitting power of user terminal according to described hierarchical lists and road loss compensation factor tabulation.
Wherein, described steps A further comprises:
Limited interference source selection threshold value one is determined in A1, described base station;
All interference base stations in A2, the described base station measurement adjacent cell list and the interference signal intensity of relay station;
A3, described base station selected interference signal intensity are higher than described limited interference source and select the interference base station of threshold value one and relay station as its limited interference source.
Wherein, threshold value described in the step B is determined according to the high reject signal intensity that arrives in this sub-district, comprise and be used to divide the threshold value one of noiseless zone and transition region and the threshold value two that is used to divide transition region and limited interference source zone, described threshold value one is less than threshold value two, described noiseless zone is meant that high reject signal intensity is lower than the zone of threshold value one, described limited interference source zone is meant that high reject signal intensity is higher than the zone of threshold value two, and described transition region is meant the zone of strong jamming intensity between threshold value one and threshold value two.
Wherein, in the described step e, described high reject signal intensity less than first interference signal intensity contrast threshold for the moment, the operation of base station further comprises:
1. set hierarchical lists and the road loss compensation factor tabulation used when relay station is in the different layers of base station coverage area;
2. judge the relay station or the layering of user terminal place of current service according to described high reject signal intensity, determine hierarchical lists and the corresponding road loss compensation factor tabulation that the relay station of described current service will use according to described hierarchical lists and road loss compensation factor tabulation;
3. the transmitting power of part Poewr control method calculating relay station and user terminal is adopted in the base station, and notifies relay station with the hierarchical lists and the road loss compensation factor tabulation of this transmitting power and described definite use by up link;
4. relay station and user terminal are adjusted in real time according to described transmitting power.
Wherein, described step 1. in, the employed hierarchical lists of its subordinate relay stations is set according to the residing position of relay station in the base station, is specially: if relay station is in the noiseless zone of base station, then its overlay area is divided into transition region and limited interference source zone; If be in the transition region of its slave base stations, then its overlay area be divided into noiseless zone and limited interference source zone; If be in the limited interference source zone of its slave base stations, then its overlay area be divided into noiseless zone, transition region and limited interference source zone.
Wherein, described step 1. in, the layered mode of its subordinate relay stations is set in the base station according to its overlay area size: adopt the layering identical with described base station or adopt part layering in the layering of described base station.
Wherein, the number for the road loss compensation factor of the every layer of configuration in base station among the described step C is decided according to the size of this base station coverage area, and the road loss compensation factor of transition region is single value, centrifugal pump or successive value.
Wherein, the load in the limited interference source of described base station zone and noiseless zone is overweight or when overloading, a threshold value is set, according to this threshold value the transition region of base station is divided into noiseless transition region and limited interference source transition region, the running time-frequency resource of described noiseless transition region and limited interference source transition region is allocated respectively to the noiseless zone and the limited interference source zone of base station used.
Wherein, in the described method, the shared running time-frequency resource of each layer of base station keeps quadrature, and orthogonal manner is complete quadrature or accurate quadrature.
A kind of the method for Inter-Cell Interference Coordination is carried out in the overlay area of relay station, may further comprise the steps:
The relay station of a, current service is set limited interference source and is selected threshold value two, selects the interference base station of adjacent sub-district and relay station as its limited interference source according to this threshold value;
B, described relay station receive hierarchical lists and road loss compensation factor tabulation from its home base station;
C, described relay station are determined the area dividing threshold value according to its limited interference source, and divide its overlay area according to this threshold value and described hierarchical lists;
D, be each layer configuration running time-frequency resource of relay station, and keep the shared running time-frequency resource quadrature of each layer according to described limited interference source;
E, setting first interference signal intensity contrast threshold two;
F, measure current high reject signal intensity, if this intensity is greater than described first interference signal intensity contrast threshold two, then the relay station informing user terminal disconnects and connecting, and restarts the process that inserts at random; Otherwise described relay station is adjusted the transmitting power of user terminal according to current high reject signal intensity.
Wherein, described step a further comprises:
A1, described relay station are set limited interference source and are selected threshold value two;
A2, described relay station obtain adjacent cell list from the base station of its ownership;
The interference signal intensity of all interference base stations and relay station in a3, the described relay station measurement adjacent cell list;
A4, described relay station are selected interference signal intensity to be higher than the interference base station of described limited interference source selection threshold value two and are disturbed relay station as its limited interference source.
Wherein, among the described step f, high reject signal intensity is during less than first interference signal intensity contrast threshold two, the operation of relay station further comprises: layering and the corresponding road loss compensation factor of determining relay station overlay area, user terminal place according to described high reject signal intensity, calculate the transmitting power of user terminal then, and, after receiving, launches described user terminal by this transmitting power by this transmitting power of up link informing user terminal.
The present invention has following beneficial effect:
The present invention proposes a kind of inter-cell interference coordination method based on the limited interference source set, the interference source that this method selects threshold value will have in the relay wireless communications network of RS by the interference source signal strength signal intensity is limited, will be in limited scope by the interference signal comparison threshold value to the interference-limited of RS and UT, and according to limited interference source with the cordless communication network layering, the shared running time-frequency resource of determined limited interference source is carried out reasonable configuration keep quadrature to guarantee the shared running time-frequency resource of limited interference source, control the up-link transmission power of different layers simultaneously and adopt two step interference coordination modes that BS and RS overlay area are carried out interference coordination, have the following advantages:
(1) adopts the method for determining cell interference source according to interference source signal strength signal intensity selection threshold value, in certain scope, the overhead when effectively having solved Inter-Cell Interference Coordination is excessive, round-trip delay is long and load is heavier or full load is difficult to guarantee that the shared running time-frequency resource of interference source is difficult to problems such as quadrature with the interference-limited of sub-district.
(2) at severe load of limited interference source distributed areas or full load, adopt area dividing mode and the time-frequency resource distribution mode based on limited interference source of the present invention, the running time-frequency resource that helps the flexible dispatching of running time-frequency resource and separate different limited interference source has reduced the interference of minizone to guarantee the quadrature of running time-frequency resource.
(3) setting of transition region makes the scheduling of running time-frequency resource more flexible, particularly when load increases, help keeping the quadrature of running time-frequency resource, divide threshold value by reasonable setting area simultaneously, the running time-frequency resource of zones of different in can allotting network, reach running time-frequency resource fully, reasonable use.
(4) in different sub-districts, a plurality of road loss compensation factors can be set, cooperate the use of transition region simultaneously, further refinement cell coverage area, under the prerequisite that reduces to disturb, improve transmitting power as far as possible, reach the purpose that improves cell edge and edge, relay station overlay area UT throughput and UT average throughput.
Description of drawings
Fig. 1 (a) and (b) have two kinds of hierarchy schematic diagrames of the cordless communication network of relay station for the present invention;
Fig. 2 (a) and (b) be two kinds of set-up mode schematic diagrames of road loss compensation factor of the present invention;
Fig. 3 (a) and (b) be two kinds of time-frequency resource allocating schematic diagrames of the present invention;
Fig. 4 (a) and (b) be respectively the method flow diagram that base station and relay station overlay area is carried out interference coordination.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
The invention provides a kind of method of determining adjacent cell interference source by interference source signal strength signal intensity selection threshold value, overhead when the interference-limited of adjacent sub-district is effectively solved Inter-Cell Interference Coordination in certain scope is excessive, round-trip delay is long and load is heavier or full load is difficult to guarantee the shared problems such as running time-frequency resource quadrature of interference source, and this method is made up of two parts:
＜1〉by the selection of BS to limited interference source;
＜2〉by the selection of RS to limited interference source.
Described step＜1〉in, BS selects the method for limited interference source to be:
At first, BS determines limited interference source selection threshold value one.This threshold value is used for distinguishing all BS and the RS that can cause strong presence of intercell interference to this sub-district BS; The orthogonality of the running time-frequency resource that the overhead when this threshold value definite will finally influence Inter-Cell Interference Coordination, round-trip delay and the limited interference source of determining are shared; In different sub-district BS, different values can be set, help effectively determining main interference source.
Then, all in the BS measurement adjacent cell list are disturbed the interference signal intensity of BS and RS.
At last, BS select that interference signal intensity is higher than that limited interference source selects threshold value one all disturb BS and RS as its limited interference source.
In above-mentioned two steps, comparing result according to interference signal intensity of measuring and limited interference source selection threshold value one, finally determine current area is produced several interference sources BS and the interference source RS of strong presence of intercell interference, for further Inter-Cell Interference Coordination is prepared.
Described step＜2〉in, RS selects the method for limited interference source to be:
At first, RS determines limited interference source selection threshold value two; This threshold value is used to distinguish the BS and the RS that can cause strong presence of intercell interference to current RS.
Secondly, RS obtains adjacent cell list from BS.
Then, all disturb the interference signal intensity of BS and RS in the RS measurement adjacent cell list.
At last, RS selects interference signal intensity to be higher than limited interference source to select the interference BS of threshold value two and RS as its limited interference source.
In above-mentioned three steps, RS obtains adjacent cell list from BS, all disturb the interference signal intensity of BS and RS in the measurement adjacent cell list, comparing result according to interference signal intensity of measuring and limited interference source selection threshold value two, finally determine current area is produced several interference sources BS and the RS of strong presence of intercell interference, for further Inter-Cell Interference Coordination is prepared.
The invention provides a kind of new region dividing mode,, the cordless communication network overlay area is divided into noiseless zone, limited interference source zone and transition region according to the area dividing threshold value based on limited interference source.This method comprises two aspects: the area dividing of the area dividing of BS overlay area and RS overlay area.
The area dividing step of BS overlay area is as follows:
Step I, BS divides threshold value according to the distribution setting area of limited interference source;
Step I i, BS divide threshold value according to above-mentioned zone layering are carried out in the sub-district, comprising: noiseless zone, transition region, limited interference source zone.
Threshold value in the described step I is determined according to arriving in the cell list high reject signal intensity, generally comprise two threshold values, be respectively: be used to divide the threshold value one of noiseless zone and transition region and the threshold value two of dividing transition region and limited interference source zone, threshold value one is less than threshold value two.
Among the described step I i:
Noiseless zone is meant that high reject signal intensity is lower than the zone of threshold value one, can think in this zone that presence of intercell interference intensity is very low even does not have, and can ignore the influence of presence of intercell interference.
The limited interference source zone is meant that high reject signal intensity is higher than the zone of threshold value two, and this zone is the high zone of presence of intercell interference probability, must carry out the processing of presence of intercell interference, otherwise can influence throughput and the average UT throughput of cell edge UT.
Transition region is meant the zone of high reject signal intensity between threshold value one and threshold value two, this zone is between noiseless zone and limited interference source zone, high reject signal intensity is in the acceptable scope, but different with the sensitizing range among the LTE, main effect has two:
(j) this interference ratio limited interference source zone, zone is little, when RS and UT are in this zone, can reach target transmit power by suitable adjustment road loss compensation factor, reduced because of improving the interference that transmitting power causes other RS and UT in the cell coverage area, increase the flexibility when path loss compensates simultaneously, effectively increased throughput and the average UT throughput of cell edge and RS edge UT;
(k) the employed running time-frequency resource in this zone and noiseless zone and limited interference source zone, be that Physical Resource Block (PRB) keeps quadrature, when noiseless zone or limited interference source zone overweight or fully loaded when causing shared running time-frequency resource too much because of load, this regional running time-frequency resource can be used as effectively and replenishes, and has guaranteed the orthogonality of additional back resource simultaneously.
The area dividing step of RS overlay area is as follows:
Step I, threshold value is divided in the RS setting area;
Step II, RS carries out layering according to threshold value with the zone that is covered, and comprising: noiseless zone, transition region, limited interference source zone.
Be provided with among the described step I and divide the signal strength signal intensity that threshold value at first will be considered subordinate BS, promptly RS area dividing threshold value should be less than the area dividing threshold value of subordinate BS.In essence, because RS at first will be under the jurisdiction of certain definite zone of its subordinate BS, therefore, the signal strength signal intensity of RS self should be within the threshold range that subordinate BS is provided with, so the selection of RS threshold value will be subjected to the constraint of subordinate BS.
In the described Step II RS according to threshold value with the zone of its covering carry out layering, the layering in the RS overlay area must be considered following factor:
(m) size of subordinate BS overlay area for the overlay area when big, can be selected the layering identical with subordinate BS, promptly noiseless zone, transition region, limited interference source zone during the row refinement in the time of need be to network; And for the overlay area hour, do not need again network to be carried out refinement, therefore, part layering wherein can be selected in the RS overlay area, for example, only RS is selected transition region and limited interference source zone;
(n) position of RS in subordinate BS layering, for example, when RS is in the noiseless zone of subordinate BS, for RS and be subordinated to all UT of this RS, the interference that comes from subordinate BS is very strong, therefore, transition region and limited interference source zone can only be set, for disturbing less noiseless zone not select; When RS is in the transition region of subordinate BS, for RS and be subordinated to all UT of this RS, come from a little less than the interference relatively of subordinate BS, and it is stronger to come from the interference of other RS in the subordinate BS coverage, therefore, noiseless zone and limited interference source zone can only be set; When RS is in the limited interference source zone of subordinate BS, for RS and be subordinated to all UT of this RS, come from a little less than the interference very of subordinate BS, and it is stronger to come from the subordinate BS coverage interference of other RS and adjacent sub-district, therefore, noiseless zone, transition region and limited interference source zone can be set.
In the said method, the area dividing of RS will be considered the equilibrium between the complexity of interference coordination and power control etc.
For the particular cell that BS covered, bigger as certain regional scope after the zoning, in the time of can not considering to disturb, be in this regional RS and can select not zoning.
The present invention also provides two kinds of time-frequency resource allocating modes:
1) the complete quadrature method of salary distribution:, be provided with adjacent with it transition region in each limited interference source zone in order to carry out effectively and reasonably scheduling to the shared running time-frequency resource of limited interference source.The limited interference source zone is close to the transition region of coupling, when guaranteeing the running time-frequency resource quadrature, can make the running time-frequency resource in interference-free coverage area territory and the running time-frequency resource of limited interference source zone and transitional region keep quadrature respectively.Help like this limited interference source zone at severe load or its running time-frequency resource of full load flexible dispatching and the running time-frequency resource that separates different limited interference source to guarantee the quadrature of running time-frequency resource, reduce the interference of minizone.
2) the accurate quadrature method of salary distribution: in order to reduce the complexity of system, when time-frequency resource allocating, the running time-frequency resource of noiseless zone and transitional region is put together, the noiseless zone that is called associating, the running time-frequency resource of transitional region perhaps is not set, in noiseless zone, comprise the running time-frequency resource when transition region is set, be called the noiseless zone of merging.During time-frequency resource allocating, distributed allocation is carried out in limited interference source zone and the noiseless zone of associating or the noiseless zone of merging, the running time-frequency resource in the noiseless zone of the running time-frequency resource in employing limited interference source zone and the noiseless zone of associating or merging distributes at interval, when severe load or full load, can adopt the stronger zone of interference to use the complete quadrature of running time-frequency resource in the noiseless zone of limited interference source zone and noiseless zone of uniting or merging, and disturb more weak zone to make the limited interference source zone keep quadrature, guarantee that each shared running time-frequency resource in zone keeps accurate quadrature.This mode has reduced the complexity of system, helps dispatching each regional running time-frequency resource more.
Each regional running time-frequency resource can adopt and centralizedly also can adopt distributed allocation in above-mentioned two kinds of time-frequency resource allocating modes, guarantee that the shared running time-frequency resource of limited interference source keeps complete quadrature or accurate quadrature.
The running time-frequency resource of transition region is used in both cases: a kind of, use in severe load or full load in noiseless zone or limited interference source zone; Another kind, the running time-frequency resource that takies when high-level scheduling limited interference source zone uses at need.After the running time-frequency resource of transition region is used, when the running time-frequency resource in noiseless zone or limited interference source zone is abundant, be released by high-level scheduling.
The present invention is according to the distribution method of system of selection, region partitioning method and the time-frequency resource of above-mentioned limited interference source, layering is carried out in overlay area in the relaying cordless communication network, adopt two step interference coordination modes that BS and RS overlay area are carried out interference coordination, specific as follows described.
For the interference coordination of BS, step is as follows:
Step 1:BS determines limited interference source selection threshold value one;
All disturb the interference signal intensity of BS and RS in the step 2:BS measurement adjacent cell list;
The base station selected interference signal intensity of step 3:BS is higher than limited interference source and selects the interference BS of threshold value one and RS as its limited interference source;
Threshold value when step 4:BS determines noiseless zone, limited interference source zone, transition region division according to the distribution of limited interference source;
Step 5, BS determine the road loss compensation factor that each is regional;
Step 6:BS determines the running time-frequency resource that each is regional according to the distribution of limited interference source, and promptly Physical Resource Block makes all resources keep quadrature;
Step 7:BS determines first interference signal intensity contrast threshold one;
The hierarchical lists that RS used when step 8:BS determined that RS is in different layering;
The road loss compensation factor tabulation that RS used when step 9:BS determined that RS is in different layering;
Step 10:BS determines the running time-frequency resource of RS, and promptly Physical Resource Block makes the resource of RS use keep quadrature;
Step 11:RS and UT measure high reject signal intensity;
The high reject signal intensity that step 12:BS will measure compares with the first interference signal intensity contrast threshold one that sets in advance, when the high reject signal intensity of measuring greater than first interference signal intensity contrast threshold for the moment, enter step 13, when measuring high reject signal intensity for the moment, carry out step 14 less than first interference signal intensity contrast threshold;
Step 13:BS starts random access procedure to RS or UT, withdraws from this flow process afterwards;
Step 14:BS determines the RS of current service and the overlay area at UT place according to high reject signal intensity;
Step 15:BS determines the road loss compensation factor that this RS and UT use according to RS and UT region;
Step 16:BS determines the hierarchical lists that the RS of current service uses;
Step 17:BS determines the road loss compensation factor tabulation that the different layerings of the RS of current service are used;
Step 18:BS calculates the transmitting power of RS and UT according to the part Poewr control method;
Step 19:BS calculates the transmitting power that the back is adjusted by uplink grant notice RS and UT;
The hierarchical lists that step 20:BS uses by uplink grant notice RS;
The road loss compensation factor tabulation that step 21:BS uses by the different layerings of uplink grant notice RS;
Step 22: the transmitting power emission of adjusting after described RS and UT the calculating according to the BS notice.
In the described step 1, therefore the flexibility when limited interference source selects threshold value one will influence the number of interference source BS and time-frequency resource allocation, plays important effect according to different network demand choose reasonable threshold values to the reduction presence of intercell interference.In addition, the different B S in the cordless communication network can use different interference sources to select threshold value, and different interference source set promptly can be arranged.
Described step 4 is divided noiseless zone, transition region and limited interference region by preset threshold.
This threshold value the division that can have a strong impact on layering in the relay wireless communications network is set, also can therefore, can threshold value be set according to different network demands and rationally divide network simultaneously by the different zone of different threshold scalings is set.
Being provided with of threshold value can also be played the effect of allocating load in the relay wireless communications network.Certain regional load is heavier or fully loaded in the relaying cordless communication network, and other area load are light or during intermediate part load, can adjust the setting of threshold value, make the expanded range in the heavier or fully loaded zone of load, adjusting range enlarges the occupied running time-frequency resource of back loading simultaneously, it is the position of Physical Resource Block (PRB), make itself and other regional resource still keep quadrature, simultaneously, the road loss compensation factor of RS and UT in the adjusting range enlarged area, the up-link transmission power of control different layers carry out the coordination of presence of intercell interference and improve cell edge in the cordless communication network and the UT throughput and the average UT throughput at RS edge under not having the prerequisite of bandwidth loss.
Wherein, transition region is a special region, in order further to divide network, can reset threshold value in transition region divides, for example, reset a new threshold value, transition region is divided into noiseless transition region and limited interference source transition region, more flexible when the running time-frequency resource of high-level scheduling RS and UT like this.
In the described step 5, a plurality of road loss compensation factors can be set in different zones.But for complexity and the overhead that reduces high-level scheduling, each regional road loss compensation factor number will rationally be provided with according to the demand of cordless communication network.
Each regional road loss compensation factor number can for bigger sub-district, can be provided with more road loss compensation factor in each zone according to the size reasonable adjustment of cell coverage area, and throughput and the UT average throughput of UT are improved in further refinement sub-district.
Being provided with of road loss compensation factor can be meticulousr than noiseless zone and limited interference source zone in the transition region, for accurately adjust the transmitting power of RS and UT, as far as possible keep RS and UT particularly the running time-frequency resource of limited interference source region R S and UT keep quadrature.
Being provided with of road loss compensation factor can be single value, centrifugal pump, successive value in the transition region.When the path loss factor in the transition region is centrifugal pump, successive value, the strong jamming level signal strength threshold of wanting also in the transition region that the setting area divides, similar to the threshold value of distinguishing noiseless zone, transition region, limited interference source zone.
Keep the running time-frequency resource quadrature in the described step 6, mainly be meant the limited interference source zone that to carry out interference coordination.For noiseless zone, because it is less to be subjected to the interference of BS or RS, so the quadrature demand of resource is not strong.Transition region since need be in noiseless zone or the limited interference source region resource allocate when nervous, therefore, need partly keep quadrature to the running time-frequency resource that transition region is formulated to the limited interference source zone.The running time-frequency resource in noiseless zone, promptly Physical Resource Block is less because of presence of intercell interference, can have overlapping.
The first interference signal intensity contrast threshold one that BS determines in the described step 7, be used for determining the whether correctly criterion of access network of RS or UT, because when RS or UT are mobile in cordless communication network, enter the zone of other BS or RS covering from the zone of current BS or RS covering, the high reject signal intensity of measuring this moment may be greater than the signal strength signal intensity of self, if seriously influence but still handle to bring to up-link power control as interference signal, therefore introduce the notion of first interference signal intensity contrast threshold among the present invention, the high reject signal intensity of judge measuring, enable different handling processes then, help the realization of up-link power control and final Inter-Cell Interference Coordination.
BS determines the hierarchical lists that RS uses when being in different layering in the described step 8, for the layering of RS as mentioned above, consider the influence of two aspect factors, finally may cause the layering result of RS different, therefore, BS will set up the zone of using under the different layering results, for example, RS1 only uses transition region and limited interference source zone, and RS2 does not use layering, and RS3 uses noiseless zone, transition region and limited interference source zone etc.
BS determines the road loss compensation factor tabulation of the different layerings of RS in the described step 9, corresponding to different hierarchical lists, uses different road loss compensation factors, uses jointly with the hierarchical lists that is provided with in the step 8, determines layering situation and the road loss compensation factor of RS.
BS determines the running time-frequency resource of RS in the described step 10, i.e. Physical Resource Block (PRB), and the resource that RS is used keeps quadrature, even the running time-frequency resource between BS, all RS and the affiliated UT thereof keeps quadrature, is provided with identical with step 6.
In the described step 11, RS and UT measure high reject signal intensity, and report BS, and BS determines RS and residing zone of UT and road loss compensation factor according to high reject signal intensity.
In the described step 12, high reject signal intensity of BS measurement of comparison and the first interference signal intensity contrast threshold that sets in advance, when measuring interference signal intensity greater than first interference signal intensity contrast threshold, enter step 13, when measuring high reject signal intensity, carry out step 14 less than first interference signal intensity contrast threshold.Enter different flow processs according to the result who judges.
BS described in the described step 13 starts random access procedure to RS or UT.BS notice RS and UT disconnect be connected before, RS and UT will report the disconnection connection requests, the BS of subordinate determines that with the running time-frequency resource of other RS that are adjacent UT disconnects being connected according to current BS, restarts the process that inserts at random, still starts the process of interference coordination.
BS determines zone, the road loss compensation factor at RS and UT place in the described step 14,15.Under the situation that fully takes into account sub-district internal burden situation and UT self, adjust the transmitting power of UT to reach the purpose of interference coordination by using the part power compensating method.
The described BS of described step 16 determines the hierarchical lists that RS uses, and BS selects the employed hierarchical lists of RS according to high reject signal intensity and residing zone that RS reports from the hierarchical lists that sets in advance.
BS determines the road loss compensation factor tabulation that the different layerings of RS are used in the described step 17, and the hierarchical lists that the RS that determines in the high reject signal intensity that BS reports according to RS, residing zone, the step 16 selects is determined corresponding road loss compensation factor tabulation.
BS is according to the transmitting power of part Poewr control method calculating RS and UT in the described step 18, and the base station adopts the part power control algorithm to adjust the transmitting power of RS and UT according to zone of determining and road loss compensation factor, finally reaches the purpose of interference coordination.
BS when calculating RS and UT transmitting power, consider following some:
(u) distinguish interference source,, and handle by coordinated mode respectively from the interference of neighbour region BS and RS for interference from this sub-district BS and RS;
(v) comprise the RS of this sub-district and the BS and the RS of adjacent sub-district in the adjacent cell list of BS, and can distinguish;
BS calculates the transmitting power that the back is adjusted by uplink grant notice RS and UT in the described step 19, finishes the purpose that the final power adjustment reaches Inter-Cell Interference Coordination, is convenient to RS and UT transmitting power is carried out real-time adjustment.
The hierarchical lists that BS uses by uplink grant notice RS in the described step 20 is for preparing RS adjustment self overlay area.
The road loss compensation factor tabulation that BS uses by the different layerings of uplink grant notice RS in the described step 21 is united use with step 17, finishes the layering of RS overlay area is handled.
The transmitting power emission of adjusting after RS and UT the calculating in the described step 22 according to the BS notice.RS and UT have finished the purpose that reaches Inter-Cell Interference Coordination by power control according to after calculating the transmitting power emission of adjusting the back.
For the interference coordination of RS, step is as follows:
Step 1: RS determines limited interference source selection threshold value two;
Step 2: RS measures all interference signal intensity of disturbing BS and disturbing RS in the adjacent cell list;
Step 3: BS is according to selecting interference signal intensity to select the interference BS of threshold value two and disturb RS as its limited interference source greater than limited interference source;
Step 4: RS receives the hierarchical lists of determining from BS;
Step 5: RS receives the road loss compensation factor tabulation of determining from BS;
Threshold value when step 6: RS determines area dividing according to the distribution of limited interference source, and layering is carried out in its overlay area according to this threshold value and hierarchical lists;
Step 7: RS determines the running time-frequency resource of zones of different according to the distribution of limited interference source, and promptly Physical Resource Block makes all resources keep quadratures;
Step 8: RS determines first interference signal intensity contrast threshold two;
Step 9: UT measures high reject signal intensity;
Step 10: high reject signal intensity of RS measurement of comparison and the first interference signal intensity contrast threshold two that sets in advance, when measuring interference signal intensity greater than first interference signal intensity contrast threshold two, enter step 11, when measuring high reject signal intensity, carry out step 12 less than first interference signal intensity contrast threshold two;
Step 11: RS starts random access procedure to UT, withdraws from this flow process afterwards;
Step 12: RS adjusts the transmitting power of UT according to the high reject signal intensity of measuring.
Described step 4, five, six is hierarchical lists and the road loss compensation factor tabulation that produces when receiving the BS interference coordination, and the definite area dividing threshold value of combination is finished the layering processing to the RS overlay area.Wherein, the set threshold value of the area dividing threshold ratio RS of RS is little.
RS determines the running time-frequency resource of zones of different in the described step 7, i.e. Physical Resource Block makes all resources keep quadratures, be provided with under the BS situation identical.
Described step 8, nine with the BS situation under identical.Wherein, the first interference signal intensity contrast threshold among the RS two can be provided with flexibly according to the different layerings among the RS BS of living in.
Described step 10 comprises RS in interior presence of intercell interference in order to effectively reduce to step 12, RS is provided with the two-step interference coordination according to high reject signal intensity, comprises two parts:
(x) if high reject signal intensity less than the signal strength signal intensity of the RS of current service, then adopts the step identical with the RS interference coordination to carry out the transmitting power adjustment, and finally finishes interference coordination.
(y) if high reject signal intensity greater than the signal strength signal intensity of the RS of current service, at first the RS of current service notice UT disconnects and connecting, and restarts the process that inserts at random.
Before RS notice UT disconnects connection, UT disconnected connection requests under RS will report RS, the BS of subordinate determines that with the running time-frequency resource of other RS that are adjacent UT disconnects being connected according to current BS, restarts the process that inserts at random, still starts the process of interference coordination.
Described step 12 further comprises: RS determines the layering and the corresponding road loss compensation factor of RS overlay area, UT place according to described high reject signal intensity, calculate the transmitting power of UT then, and, after receiving, launches described UT by this transmitting power by this transmitting power of up link notice UT.
Fig. 1 is the hierarchy schematic diagram of cordless communication network of the present invention.Fig. 1 (a) has only divided the schematic diagram in noiseless zone, transition region, limited interference source zone for the overlay area of base station in the network; Fig. 1 (b) is for being provided with a threshold value in the transition region, and transition region is divided into the schematic diagram of noiseless transition region and limited interference source transition region, and the setting that the adjustment in each zone can passing threshold is carried out flexibly.
Fig. 2 is provided with schematic diagram for road loss compensation factor of the present invention.Fig. 2 (a) is provided with a road loss compensation factor respectively for the nothing of cell coverage area is done around the zone, limited interference source is regional, and transition region is provided with a road loss compensation factor set; Fig. 2 (b) is for the noiseless zone of cell coverage area is provided with a road loss compensation factor, and the limited interference source zone is provided with two road loss compensation factors, and transition region is provided with a road loss compensation factor set.
Wherein, the road loss compensation factor of transition region setting set can be set to single value, centrifugal pump and successive value according to the demand of cordless communication network, so that carry out equilibrium between the complexity of the validity of Inter-Cell Interference Coordination and power adjustment.
Fig. 3 is two kinds of time-frequency resource allocating schematic diagrames of the present invention.Wherein Fig. 3 (a) is for adopting the time-frequency resource allocating schematic diagram of the complete quadrature method of salary distribution, and Fig. 3 (b) is for adopting the time-frequency resource allocating schematic diagram of the accurate quadrature method of salary distribution.
Fig. 4 is the realization flow figure of inter-cell interference coordination method of the present invention.Wherein Fig. 4 (a) is the realization flow figure of BS interference coordination, and Fig. 4 (b) is the realization flow figure of RS interference coordination.
The step of BS interference coordination comprises:
101, BS selects it is produced the interference BS that disturbs stronger adjacent sub-district and disturbs RS as its limited interference source; System of selection as mentioned above.
102, the area dividing threshold value of BS is set according to limited interference source, according to this threshold value the overlay area of BS is divided into three layer regions: noiseless zone, transition region and limited interference source zone.
103, be that each layer of BS disposes road loss compensation factor and running time-frequency resource respectively according to limited interference source, described road loss compensation factor is used to control the up-link transmission power of its equivalent layer.
104, set first interference signal intensity contrast threshold one;
105, measure current high reject signal intensity, if this intensity greater than described first interference signal intensity contrast threshold one, then enters step 106, otherwise enters step 107.
106, notify current UT to disconnect and connect, restart the process that inserts at random, withdraw from this flow process afterwards.
107, BS sets hierarchical lists and the road loss compensation factor tabulation of using respectively when RS is in different layers; Then, judge the RS or the layering of UT place of current service, determine hierarchical lists and the corresponding road loss compensation factor tabulation that this RS will use according to described hierarchical lists and road loss compensation factor tabulation according to high reject signal intensity.
108, BS adopts the transmitting power of part Poewr control method calculating RS and UT, and notifies RS with the hierarchical lists and the road loss compensation factor tabulation of this transmitting power and described definite use by up link;
109, RS and UT adjust in real time according to described transmitting power.
Step for the RS interference coordination comprises:
201, RS selects it is produced the interference BS that disturbs stronger adjacent sub-district and disturbs RS as its limited interference source, and system of selection as mentioned above.
202, RS receives hierarchical lists and road loss compensation factor tabulation from BS.
203, RS determines its area dividing threshold value according to limited interference source, divides its overlay area according to this threshold value and described hierarchical lists.
204, RS is its each layer configuration running time-frequency resource according to limited interference source.
205, set first interference signal intensity contrast threshold two.
206, measure current high reject signal intensity, if this intensity greater than described first interference signal intensity contrast threshold two, then enters step 207, otherwise enters step 208.
207, RS notice UT disconnects and connecting, and restarts the process that inserts at random, withdraws from this flow process afterwards.
208, RS determines the layering and the corresponding road loss compensation factor of RS overlay area, UT place according to high reject signal intensity.
209, RS calculates the transmitting power of UT, and by this transmitting power of up link notice UT.
210, launch by this transmitting power after UT receives.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of the method for Inter-Cell Interference Coordination is carried out in the overlay area of base station, it is characterized in that, may further comprise the steps:
A, base station sets limited interference source select threshold value one, select the interference base station of adjacent sub-district and relay station as its limited interference source according to this threshold value;
B, base station are provided with its area dividing threshold value according to described limited interference source, according to this threshold value the overlay area of base station are divided into three layers: noiseless zone, transition region and limited interference source zone;
C, base station dispose road loss compensation factor and running time-frequency resource according to described limited interference source respectively for its each layer, and described road loss compensation factor is used to control the up-link transmission power of its equivalent layer;
D, setting first interference signal intensity contrast threshold one;
E, measure current high reject signal intensity,, restart the process that inserts at random if this intensity greater than described first interference signal intensity contrast threshold one, is then notified active user's terminal to disconnect and connected; Otherwise the road loss compensation factor tabulation of the employed hierarchical lists of the relay station of base station sets current service and each layer is adjusted the relay station of current service and the transmitting power of user terminal according to described hierarchical lists and road loss compensation factor tabulation.
2, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, described steps A further comprises:
Limited interference source selection threshold value one is determined in A1, described base station;
All interference base stations in A2, the described base station measurement adjacent cell list and the interference signal intensity of relay station;
A3, described base station selected interference signal intensity are higher than described limited interference source and select the interference base station of threshold value one and relay station as its limited interference source.
3, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, threshold value described in the step B is determined according to the high reject signal intensity that arrives in this sub-district, comprise and be used to divide the threshold value one of noiseless zone and transition region and the threshold value two that is used to divide transition region and limited interference source zone, described threshold value one is less than threshold value two, described noiseless zone is meant that high reject signal intensity is lower than the zone of threshold value one, described limited interference source zone is meant that high reject signal intensity is higher than the zone of threshold value two, and described transition region is meant the zone of strong jamming intensity between threshold value one and threshold value two.
4, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, in the described step e, described high reject signal intensity less than first interference signal intensity contrast threshold for the moment, the operation of base station further comprises:
1. set hierarchical lists and the road loss compensation factor tabulation used when relay station is in the different layers of base station coverage area;
2. judge the relay station or the layering of user terminal place of current service according to described high reject signal intensity, determine hierarchical lists and the corresponding road loss compensation factor tabulation that the relay station of described current service will use according to described hierarchical lists and road loss compensation factor tabulation;
3. the transmitting power of part Poewr control method calculating relay station and user terminal is adopted in the base station, and notifies relay station with the hierarchical lists and the road loss compensation factor tabulation of this transmitting power and described definite use by up link;
4. relay station and user terminal are adjusted in real time according to described transmitting power.
5, as the overlay area of base station being carried out as described in the claim 4 method of Inter-Cell Interference Coordination, it is characterized in that, described step 1. in, the employed hierarchical lists of its subordinate relay stations is set according to the residing position of relay station in the base station, be specially:, then its overlay area is divided into transition region and limited interference source zone if relay station is in the noiseless zone of base station; If be in the transition region of its slave base stations, then its overlay area be divided into noiseless zone and limited interference source zone; If be in the limited interference source zone of its slave base stations, then its overlay area be divided into noiseless zone, transition region and limited interference source zone.
6, as the overlay area of base station being carried out as described in the claim 4 method of Inter-Cell Interference Coordination, it is characterized in that, described step 1. in, the layered mode of its subordinate relay stations is set in the base station according to its overlay area size: adopt the layering identical with described base station or adopt part layering in the layering of described base station.
7, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, number for the road loss compensation factor of the every layer of configuration in base station among the described step C is decided according to the size of this base station coverage area, and the road loss compensation factor of transition region is single value, centrifugal pump or successive value.
8, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, the load in the limited interference source of described base station zone and noiseless zone is overweight or when overloading, a threshold value is set, according to this threshold value the transition region of base station is divided into noiseless transition region and limited interference source transition region, the running time-frequency resource of described noiseless transition region and limited interference source transition region is allocated respectively to the noiseless zone and the limited interference source zone of base station used.
9, according to claim 1 the overlay area of base station is carried out the method for Inter-Cell Interference Coordination, it is characterized in that, in the described method, the shared running time-frequency resource of each layer of base station keeps quadrature, and orthogonal manner is complete quadrature or accurate quadrature.
10, a kind of the method for Inter-Cell Interference Coordination is carried out in the overlay area of relay station, it is characterized in that, may further comprise the steps:
The relay station of a, current service is set limited interference source and is selected threshold value two, selects the interference base station of adjacent sub-district and relay station as its limited interference source according to this threshold value;
B, described relay station receive hierarchical lists and road loss compensation factor tabulation from its home base station;
C, described relay station are determined the area dividing threshold value according to its limited interference source, and divide its overlay area according to this threshold value and described hierarchical lists;
D, be each layer configuration running time-frequency resource of relay station, and keep the shared running time-frequency resource quadrature of each layer according to described limited interference source;
E, setting first interference signal intensity contrast threshold two;
F, measure current high reject signal intensity, if this intensity is greater than described first interference signal intensity contrast threshold two, then the relay station informing user terminal disconnects and connecting, and restarts the process that inserts at random; Otherwise described relay station is adjusted the transmitting power of user terminal according to current high reject signal intensity.
11, as the overlay area of relay station being carried out as described in the claim 10 method of Inter-Cell Interference Coordination, it is characterized in that described step a further comprises:
A1, described relay station are set limited interference source and are selected threshold value two;
A2, described relay station obtain adjacent cell list from the base station of its ownership;
The interference signal intensity of all interference base stations and relay station in a3, the described relay station measurement adjacent cell list;
A4, described relay station are selected interference signal intensity to be higher than the interference base station of described limited interference source selection threshold value two and are disturbed relay station as its limited interference source.
12, as the overlay area of relay station being carried out as described in the claim 10 method of Inter-Cell Interference Coordination, it is characterized in that, among the described step f, high reject signal intensity is during less than first interference signal intensity contrast threshold two, the operation of relay station further comprises: layering and the corresponding road loss compensation factor of determining relay station overlay area, user terminal place according to described high reject signal intensity, calculate the transmitting power of user terminal then, and, after receiving, launches described user terminal by this transmitting power by this transmitting power of up link informing user terminal.
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