CN101494897B - 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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- CN101494897B CN101494897B CN2008100656617A CN200810065661A CN101494897B CN 101494897 B CN101494897 B CN 101494897B CN 2008100656617 A CN2008100656617 A CN 2008100656617A CN 200810065661 A CN200810065661 A CN 200810065661A CN 101494897 B CN101494897 B CN 101494897B
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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, dividing the base station into three layers: internal layer, transition area and external layer; the base station setting link loss compensation factor and time frequency resource respectively to every layer; 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 break connection, and restart the random accessing process; otherwise, the base station setting a layer list used in the relay station of the current service and the link loss compensation factor list of each layer, and adjusting the emission power of the relay station and user terminal in the current service according to the layer list and the link loss compensation factor list. The invention effectively solves the problems of frequency spectrum utilization rate decreasing when partial power controlling and link loss compensating, and scheduling flexibility reducing when load is heavy.
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 (Wireless WorldInitiative New Radio), all propose to adopt methods such as interference randomization, interference coordination, interference eliminated to solve the problem of area interference.LTE (Long Term Evolution, the long-term technology evolution of third generation partner program) UT that gives chapter and verse in 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 the compensation of part power control and path loss 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:
Threshold value is divided in A, setting area, base station, according to this threshold value its overlay area is divided into three layer regions: internal layer, transition region and skin;
B, described base station dispose road loss compensation factor and running time-frequency resource respectively for its each layer, and described road loss compensation factor is used to control the up-link transmission power of its equivalent layer;
C, setting first interference signal intensity contrast threshold one;
D, 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, threshold value described in the steps A is determined according to the high reject signal intensity that arrives this sub-district, comprise and be used to divide the threshold value one of internal layer and transition region and be used to divide transition region and outer field threshold value two, described threshold value one is less than threshold value two, described internal layer is meant that high reject signal intensity is lower than the zone of threshold value one, described skin 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, among the described step D, 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 user terminal place layer 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 down link;
4. relay station and user terminal are adjusted in real time according to described transmitting power.
Wherein, described step 1. in, the 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 internal layer of its slave base stations, then its overlay area is divided into transition region and skin; If be in the transition region of its slave base stations, then its overlay area be divided into internal layer and skin; If be in the skin of its slave base stations, then its overlay area be divided into internal layer, transition region and skin.
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, 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.
Wherein, decide according to the size of this base station coverage area for the number of the road loss compensation factor of each layer configuration the base station among the described step B, and the road loss compensation factor of described transition region is single value, centrifugal pump or successive value.
Wherein, the skin of described base station and the load of internal layer is overweight or when overload is divided into internal layer transition region and outer transition region with the transition region of base station, and the running time-frequency resource of described internal layer transition region and outer transition region is allocated internal layer and outer use the to the base station respectively.
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 receives the tabulation of hierarchical lists and road loss compensation factor from the base station;
B, described relay station are divided its overlay area according to described hierarchical lists, and according to the up-link transmission power of described its each layer of road loss compensation factor list controls;
C, be each layer configuration running time-frequency resource of described relay station;
D, setting first interference signal intensity contrast threshold two;
E, 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, among the described step e, 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 down link informing user terminal.
The present invention has following beneficial effect:
The present invention proposes a kind of layered approach of new cordless communication network, according to this layered approach, to coverage area layer in the relaying cordless communication network, making the base station dispatch RS and the employed Physical Resource Block of UT on frequency domain is not used it by the BS of adjacent sub-district and RS and UT, the up-link transmission power of controlling different layers simultaneously carries out the coordination of presence of intercell interference and cell edge and RS edge UT throughput and the average UT throughput in the raising relay wireless communications network under not having the prerequisite of bandwidth loss, and adopt two to go on foot the interference coordination modes, based on consulting BS and RS overlay area are carried out interference coordination, have the following advantages:
(1) 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 loading condition of zones of different in can allotting network, reach running time-frequency resource fully, reasonable use.
(2) 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 is under the prerequisite that reduces to disturb, improve transmitting power as far as possible, reach the purpose that improves cell edge and RS edge UT throughput and average UT throughput.
(3) the two-step disturbance coordination method has at first been eliminated the strong jamming in minizone, through further coordinating according to the running time-frequency resource orthogonal interference, has effectively reduced the interference between BS, RS and the UT then.
(4) setting of interference signal intensity contrast signal can reach more effective interference coordination effect by the negotiation between the base station.
(5) by the area dividing of BS and RS associating in the cordless communication network that has RS, rationally adjust the sub-district in the RS overlay area in load, help running time-frequency resource utilization more effectively and reasonably.
(6) process that inserts again of the UT that provides in the interference coordination of RS, in the sub-district and RS overlay area internal burden readjust the chance that provides new.
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), (c) are respectively the time-frequency resource allocating schematic diagram of network cell when being slight load, intermediate part load, severe load, another kind of time-frequency resource allocating schematic diagram when Fig. 3 (d) is the severe load for network cell;
Fig. 4 (a) and (b) be respectively method flow diagram to base station and relay station interference coordination.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
The invention provides a kind of layered approach of the new cordless communication network that has RS, the availability of frequency spectrum when solving control of part power and path loss compensation effectively by introducing transitional region descends and load problem such as dispatching flexibility reduction when heavier.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, threshold value is divided in the BS setting area;
Step I i, BS carries out layering according to threshold value with the sub-district, comprising: internal layer area, transitional region, outer zone;
Threshold value in the described step I is determined according to arriving in the cell list high reject signal intensity, generally comprises two threshold values, is respectively: internal layer＜=transition region, transition region＜=two threshold values such as skin, be used for the zones of different of distinguishing cell.
Among the described step I i:
Internal layer be meant high reject signal intensity be lower than internal layer＜=zone of threshold value between the transition region, can think in this zone that presence of intercell interference intensity is very low even not have, can ignore the influence of presence of intercell interference.
Skin be meant high reject signal intensity be higher than transition region＜=zone of threshold value between the skin, 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 be meant high reject signal intensity between internal layer＜=transition region and transition region＜=threshold value comprised between the skin zone, this zone is between internal layer and skin, high reject signal level is in the acceptable scope, but different with the sensitizing range among the LTE, main effect has two:
(j) this zone interference ratio skin 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) this zone and internal layer and outer regional employed running time-frequency resource, be that Physical Resource Block (PRB) keeps quadrature, when internal layer or outer 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: internal layer area, transitional region, outer 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 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.
RS carries out layering according to threshold value with the zone that is covered in the described Step II, and 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 during the row refinement in the time of need be to network, that is, and and internal layer area, transitional region, outer zone; 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 transitional region and outer zone;
(n) position of RS in subordinate BS layering, for example, when RS is in the internal layer area 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, transitional region and outer zone can only be set, for disturbing less internal layer area not select; When RS is in the transitional 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, internal layer area and outer zone can only be set; When RS is in the outer 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, internal layer area and transitional region and outer 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.
According to the above-mentioned zone division methods, layering to overlay area in the relaying cordless communication network, making the base station dispatch RS and the employed Physical Resource Block of UT (PRB) on frequency domain is not used it by the BS of adjacent sub-district and RS and UT, the up-link transmission power of controlling different layers simultaneously carries out the coordination of presence of intercell interference and improves cell edge in the cordless communication network that has RS and the method for RS edge UT throughput and average UT throughput under not having the prerequisite of bandwidth loss, adopt two step interference coordination modes, in the BS overlay area, use different configuration and first interference signal intensity contrast threshold in the different layerings by introducing RS, BS and RS overlay area are carried out interference coordination based on consulting.
For the interference coordination of BS, step is as follows:
Step 1:BS determines internal layer, skin, the threshold value when transition region is divided;
Step 2:BS determines the road loss compensation factor of internal layer, skin, transition region;
Step 3:BS determines the running time-frequency resource of internal layer, skin, transition region, that is, Physical Resource Block (PRB) makes all resources keep quadrature;
Step 4:BS determines first interference signal intensity contrast threshold;
Step 5:BS determines the hierarchical lists that RS uses when being in different layering;
Step 6:BS determines the road loss compensation factor tabulation that RS uses when being in different layering;
Step 7:BS determines the running time-frequency resource of RS, and promptly Physical Resource Block (PRB) makes the resource of RS use keep quadrature;
Step 8:RS and UT measure high reject signal intensity;
The high reject signal intensity that step 9:BS will measure compares with the first interference signal intensity contrast threshold that sets in advance, when the high reject signal intensity of measuring during greater than first interference signal intensity contrast threshold, enter step 10, when measuring high reject signal intensity, carry out step 11 less than first interference signal intensity contrast threshold;
Step 10:BS starts random access procedure to RS or UT, withdraws from this flow process afterwards;
Step 11:BS determines the RS of current service and the overlay area at UT place according to high reject signal intensity;
Step 12:BS determines the RS of current service and the road loss compensation factor that UT uses;
Step 13:BS determines the hierarchical lists that the RS of current service uses;
Step 14:BS determines the road loss compensation factor tabulation that the different layerings of the RS of current service are used;
Step 15:BS calculates the transmitting power of RS and UT according to the part Poewr control method;
Step 16:BS calculates the transmitting power that the back is adjusted by uplink grant notice RS and UT;
The hierarchical lists that step 17:BS uses by uplink grant notice RS;
The road loss compensation factor tabulation that step 18:BS uses by the different layerings of uplink grant notice RS;
Step 19: the transmitting power emission of adjusting after described RS and UT the calculating according to the BS notice.
Described step 1 is divided internal layer, skin and transition 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 rationally divide network simultaneously by the different zone of different threshold scalings is set according to different network demands.
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 internal layer transition region and outer transition region, more flexible when the running time-frequency resource of high-level scheduling RS and UT like this.
In the described step 2, 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 internal layer and skin in the transition region, in order accurately to adjust the transmitting power of RS and UT, to keep the running time-frequency resource of particularly outer RS of RS and UT and UT to keep quadrature as far as possible.
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 was centrifugal pump, successive value, the strong jamming level signal strength threshold of wanting also in the transition region that the setting area divides was to distinguish internal layer, transition region, outer field threshold value similar.
Keep the running time-frequency resource quadrature in the described step 3, mainly be meant the outer zone that to carry out interference coordination.For internal layer, because it is less to be subjected to the interference of BS or RS, so the quadrature demand of resource is not strong.Therefore transition region, need be formulated to outer regional running time-frequency resource to transition region and partly keep quadrature owing to need allocate when internal layer or outer region resource anxiety;
The running time-frequency resource of interior zone, promptly Physical Resource Block is less because of presence of intercell interference, can have overlapping;
Note, the running time-frequency resource of perimeter, promptly Physical Resource Block is serious because of presence of intercell interference, needs to keep quadrature, and orthogonal manner has two kinds:
(r) running time-frequency resource position quadrature in the sub-district, still, the skin of BS and different RS can use different road loss compensation factors also can use identical road loss compensation factor, keeps complete quadrature;
(s) skin in the sub-district uses different road loss compensation factors, and part running time-frequency resource location overlap keeps accurate quadrature;
In the mode (r) when being slight load or intermediate part load in sub-district or the RS overlay area, there are enough resources to allocate, can guarantee the quadrature of running time-frequency resource fully, therefore, under the prerequisite that reduces to disturb, can improve the transmitting power of the UT of cell edge by adjusting road loss compensation factor as far as possible, reach the purpose of improving UT throughput and average UT throughput.
In sub-district or RS overlay area, be severe load or full load in the mode (s), there are not enough resources to allocate to guarantee the complete quadrature of minizone running time-frequency resource, at this moment, can be by using different road loss compensation factors in the sub-district or in the RS overlay area, adjust the transmitting power of different districts edge UT, avoid the interference that causes cell edge UT bigger, make the running time-frequency resource of the bigger UT of high reject signal intensity keep quadrature simultaneously, and overlap for UT in the transition region or the less occupied running time-frequency resource of UT of high reject signal intensity, promptly keep accurate quadrature, reach the purpose of interference coordination.
The first interference signal intensity contrast threshold that BS determines in the described step 4, 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 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 5, 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 transitional region and outer zone, and RS2 does not use layering, and RS3 uses internal layer area, transitional region and outer zone etc.
BS determines the road loss compensation factor tabulation of the different layerings of RS in the described step 6, corresponding to different hierarchical lists, uses different road loss compensation factors, uses jointly with the hierarchical lists that is provided with in the step 5, determines layering situation and the road loss compensation factor of RS.
BS determines the running time-frequency resource of RS in the described step 7, i.e. Physical Resource Block (PRB), and the resource that RS is used keeps quadrature, that is, make the running time-frequency resource between BS, all RS and the affiliated UT thereof keep quadrature, is provided with identical with step 3.
In the described step 8, RS and UT measure high reject signal intensity, and report BS, are mainly used in BS and determine RS and residing zone of UT and road loss compensation factor according to high reject signal intensity.
In the described step 9, 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 10, when measuring high reject signal intensity, carry out step 11 less than first interference signal intensity contrast threshold.Enter different flow processs according to the result who judges.
BS described in the described step 10 starts random access procedure to RS or UT.Note, BS notice RS and UT disconnect is 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 is that disconnection is connected according to current BS, restart the process that inserts at random, still start the process of interference coordination.
BS determines zone, the road loss compensation factor at RS and UT place in the described step 11,12.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 13 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 14, 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 13 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 15, and the base station finally reaches the purpose of interference coordination according to the transmitting power of part power control algorithm adjustment RS and UT according to zone of determining and road loss compensation factor.
Note, when BS calculates 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 adjusts after calculating by uplink grant notice RS and UT in the described step 16
Transmitting power is finished 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 17 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 18 is united use with step 14, 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 19 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 receives the hierarchical lists of determining from BS;
Step 2: RS receives the road loss compensation factor tabulation of determining from BS;
Step 3: the threshold value when RS determines area dividing;
Step 4: RS determines the running time-frequency resource of zones of different, and promptly Physical Resource Block makes all resources keep quadrature;
Step 5: RS determines first interference signal intensity contrast threshold;
Step 6: UT measures high reject signal intensity;
Step 7: high reject signal intensity of RS 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 8, when measuring high reject signal intensity, carry out step 9 less than first interference signal intensity contrast threshold;
Step 8: RS starts random access procedure to UT, withdraws from this flow process afterwards;
Step 9: RS adjusts the transmitting power of UT according to the high reject signal intensity of measuring.
Described step 1, two, three 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.
Notice that the set threshold value of the threshold ratio RS of RS is little.
RS determines the running time-frequency resource of zones of different in the described step 4, i.e. Physical Resource Block (PRB) makes all resources keep just giving to be provided with under the situation of base station (BS) identical.
Described step 5, six with the BS situation under identical.
Notice that the first interference signal intensity contrast threshold among the RS can be in different layerings among the BS according to RS, is provided with flexibly.
High reject signal intensity of RS measurement of comparison and the first interference signal intensity contrast threshold that sets in advance in the described step 7, when measuring interference signal intensity greater than first interference signal intensity contrast threshold, enter step 8, when measuring high reject signal intensity, carry out step 9 less than first interference signal intensity contrast threshold.Comprise RS in interior presence of intercell interference in order to effectively reduce, 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.
Note, before RS notice UT disconnected connection, UT disconnected connection requests under RS will report RS, and 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, restart the process that inserts at random, still start the process of interference coordination.
Further comprise in the described step 9: 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 internal layer, transition region, outer field schematic diagram 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 internal layer transition region and outer transition region, and the setting that the adjustment of zones of different 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 for the internal layer of cell coverage area, skin, and transition region is provided with a road loss compensation factor set; Fig. 2 (b) is provided with a road loss compensation factor for the internal layer of cell coverage area, and skin 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 the time-frequency resource allocating schematic diagram of the different layerings in minizone of the present invention.Be that example has illustrated internal layer, transition region, outer field running time-frequency resource are how to keep quadrature with 3 sub-districts among the figure.Wherein Fig. 3 (a) and (b), (c) are respectively the time-frequency resource allocating schematic diagram when network is slight load, intermediate part load, severe load in the sub-district.When Fig. 3 (d) is the severe load, when outer running time-frequency resource is nervous, the quasi-orthogonal schematic diagram of the running time-frequency resource when taking the transition region running time-frequency resource.Wherein, the internal layer of BS, RS, transition region, outer field running time-frequency resource are put together, are convenient to scheduling.
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:
Threshold value is divided in step 101:BS setting area, according to this threshold value its overlay area is divided into three layer regions: internal layer, transition region and skin;
Step 102:BS disposes road loss compensation factor and running time-frequency resource respectively for its each layer, and described road loss compensation factor is used to control the up-link transmission power of its equivalent layer;
Step 103: set first interference signal intensity contrast threshold one;
Step 104: measure current high reject signal intensity, if this intensity greater than first interference signal intensity contrast threshold one, then enters step 105, otherwise enters step 106;
Step 105: notify current UT to disconnect and connect, restart the process that inserts at random, withdraw from this flow process afterwards;
Step 106:BS sets hierarchical lists and the road loss compensation factor tabulation of using when RS is in the different layers of BS overlay area, judge the RS or the UT place layer of current service then according to described high reject signal intensity, determine hierarchical lists and the corresponding road loss compensation factor tabulation that the RS of described current service will use according to described hierarchical lists and road loss compensation factor tabulation;
Step 107: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;
Step 108:RS and UT adjust in real time according to described transmitting power.
Step for the RS interference coordination comprises:
Step 201: the RS of current service receives hierarchical lists and road loss compensation factor tabulation from BS;
Step 202:RS divides its overlay area according to described hierarchical lists, and according to the up-link transmission power of described its each layer of road loss compensation factor list controls;
Step 203: be each layer configuration running time-frequency resource of described RS;
Step 204: set first interference signal intensity contrast threshold two;
Step 205: measure current high reject signal intensity, if this intensity greater than first interference signal intensity contrast threshold two, then enters step 206, otherwise enters step 207;
Step 206:RS notice UT disconnects and connecting, and restarts the process that inserts at random, withdraws from this flow process afterwards;
Step 207:RS determines the layering and the corresponding road loss compensation factor of RS overlay area, UT place according to high reject signal intensity;
Step 208: calculate the transmitting power of UT, and by this transmitting power of up link notice UT;
After receiving, launches step 209:UT by this transmitting power.So far, finish Inter-Cell Interference Coordination.
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 (10)
1. one kind is carried out the method for Inter-Cell Interference Coordination to the overlay area of base station, it is characterized in that, may further comprise the steps:
Threshold value is divided in A, setting area, base station, according to this threshold value its overlay area is divided into three layer regions: internal layer, transition region and skin;
B, described base station dispose road loss compensation factor and running time-frequency resource respectively for its each layer, and described road loss compensation factor is used to control the up-link transmission power of its equivalent layer;
C, setting first interference signal intensity contrast threshold one;
D, 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, threshold value described in the steps A is determined according to the high reject signal intensity that arrives this sub-district, comprise and be used to divide the threshold value one of internal layer and transition region and be used to divide transition region and outer field threshold value two, described threshold value one is less than threshold value two, described internal layer is meant that high reject signal intensity is lower than the zone of threshold value one, described skin 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.
3. as the overlay area of base station being carried out as described in the claim 2 method of Inter-Cell Interference Coordination, it is characterized in that, among the described step D, 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 user terminal place layer 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 down link;
4. relay station and user terminal are adjusted in real time according to described transmitting power.
4. as the overlay area of base station being carried out as described in the claim 3 method of Inter-Cell Interference Coordination, it is characterized in that, described step 1. in, the hierarchical lists of its subordinate relay stations is set in the base station according to the residing position of relay station, be specially:, then its overlay area is divided into transition region and skin if relay station is in the internal layer of its slave base stations; If be in the transition region of its slave base stations, then its overlay area be divided into internal layer and skin; If be in the skin of its slave base stations, then its overlay area be divided into internal layer, transition region and skin.
5. as the overlay area of base station being carried out as described in the claim 3 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.
6. 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.
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, decide according to the size of this base station coverage area for the number of the road loss compensation factor of each layer configuration the base station among the described step B, and the road loss compensation factor of described 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 skin of described base station and the load of internal layer is overweight or when overload, the transition region of base station is divided into internal layer transition region and outer transition region, and internal layer and skin that the running time-frequency resource of described internal layer transition region and outer transition region is allocated respectively to the base station use.
9. one kind is carried out the method for Inter-Cell Interference Coordination to the overlay area of relay station, it is characterized in that, may further comprise the steps:
The relay station of a, current service receives the tabulation of hierarchical lists and road loss compensation factor from the base station;
B, described relay station are divided its overlay area according to described hierarchical lists, and according to the up-link transmission power of described its each layer of road loss compensation factor list controls;
C, be each layer configuration running time-frequency resource of described relay station;
D, setting first interference signal intensity contrast threshold two;
E, 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.
10. as the overlay area of relay station being carried out as described in the claim 9 method of Inter-Cell Interference Coordination, it is characterized in that, among the described step e, 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 down link informing user terminal.
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| EP1734773A1 (en) * | 2005-06-14 | 2006-12-20 | Alcatel | A method for uplink interference coordination in single frequency networks, a base station a mobile terminal and a mobile network therefor |
| CN1964548A (en) * | 2005-11-07 | 2007-05-16 | 华为技术有限公司 | A method for multiplexing of soft frequency |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
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| EP1734773A1 (en) * | 2005-06-14 | 2006-12-20 | Alcatel | A method for uplink interference coordination in single frequency networks, a base station a mobile terminal and a mobile network therefor |
| CN1964548A (en) * | 2005-11-07 | 2007-05-16 | 华为技术有限公司 | A method for multiplexing of soft frequency |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
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