CN102857925A - HII (high interference indicator)/OI (overload indicator)-based coarse-grained dynamic frequency reuse method - Google Patents
HII (high interference indicator)/OI (overload indicator)-based coarse-grained dynamic frequency reuse method Download PDFInfo
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- CN102857925A CN102857925A CN2011101828379A CN201110182837A CN102857925A CN 102857925 A CN102857925 A CN 102857925A CN 2011101828379 A CN2011101828379 A CN 2011101828379A CN 201110182837 A CN201110182837 A CN 201110182837A CN 102857925 A CN102857925 A CN 102857925A
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Abstract
The invention provides an HII (high interference indicator)/OI (overload indicator)-based coarse-grained dynamic frequency reuse method. The method includes: dividing a cell edge frequency band into three portions including a master control frequency band, a priority frequency band and a borrowing frequency band; judging that a user in a cell is an edge user or a center user, and if the user in the cell is the center user, dispatching the center user to the whole frequency band; if the user in the cell is the edge user, attempting to dispatch the edge user to the master control frequency band or the priority frequency band; if the edge user is dispatched to the priority frequency band, judging whether a valid HII on the priority frequency band is received or not, and if the valid HII on the priority frequency band is not received, dispatching the edge user to the priority frequency band; if the valid HII on the priority frequency band is received, judging whether load of the master control frequency band of the cell exceeds a preset load threshold, enabling an OI trigger mechanism to send an OI according to the interfered level of the priority frequency band if the load of the master control frequency band exceeds the preset load threshold, and dispatching the edge user to the borrowing frequency band; and otherwise, dispatching the edge user to the master control frequency band.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to interference coordination technique, particularly a kind of coarseness dynamic frequency multiplexing method based on HII/OI.
Background technology
Interference coordination technique refers to the coordination by the minizone, and the available resources of a residential quarter are carried out certain restriction, to improve the signal interference ratio (SIR) of neighbor cell on these resources, data rate and the covering of cell edge.Described resource comprises time-domain resource, frequency domain resource and transmitting power.In the use of frequency domain restriction resource, so that frequency reuse is greater than 1.
The interference coordination of minizone comprises static state/quasistatic interference coordination and dynamic interference coordination.Finish when the static interference coordination mode refers to the negotiation of resource limitation and is implemented in on-premise network, can adjust in the period of network operation, but the frequency of adjusting is slower, greater than the duration of a service conversation.More typical static interference coordination mode is the soft-frequency reuse scheme that the companies such as Huawei, Siemens propose.On the basis of static programming, according to the pattern of the factor adjustresources such as network load, UE measurement situation restriction, form quasistatic interference coordination mode.But no matter be that static interference is coordinated or the quasistatic interference coordination, all lack real-time, can not realize the optimization utilization of resource.The dynamic interference coordination mode refers to that the negotiation of resource limitation dynamically adjusts at network operation period, and the time scale of adjustment is several to dozens of Transmission Time Intervals (TTI), less than the duration of a service conversation.The dynamic interference coordination mode needs frequently information interaction, and the expense of minizone is larger.
Summary of the invention
The invention provides a kind of coarseness dynamic frequency multiplexing method based on HII/OI, can in the situation of the minizone of less expense, realize real-time Inter-Cell Interference Coordination.
A kind of coarseness dynamic frequency multiplexing method based on HII/OI that the embodiment of the invention proposes is characterized in that, comprises the steps:
A, the residential quarter available frequency band is divided into center frequency range and edge frequency range, the cell edge frequency range is divided three parts: master control frequency range, preferential frequency range and use frequency range; Wherein, master control frequency range between neighbor cell is orthogonal, the preferential frequency range of using frequency range and adjacent cell of this residential quarter is fully overlapping or overlap, for this community user, the master control frequency range has identical dispatching priority with preferential frequency range, and the dispatching priority of using frequency range is lower than master control frequency range and preferential frequency range;
User in B, the judgement residential quarter is edge customer or central user, if central user is dispatched to whole frequency range with described central user; If edge customer continues execution in step C;
C, trial are arrived master control frequency range or preferential frequency range with described edge customer scheduling.If successfully be dispatched to the master control frequency range, then process ends; If described edge customer scheduling to preferential frequency range, is continued execution in step D;
D, judge whether to receive the effective HII on the preferential frequency range, if not, with edge customer scheduling to preferential frequency range and process ends, if continue execution in step E;
E, judge that whether the load of this residential quarter master control frequency range surpasses the load-threshold that sets in advance, if, according to the level that is disturbed of preferential frequency range, send OI by the OI trigger mechanism, and with described edge customer scheduling to using on the frequency range; Otherwise with described edge customer scheduling on the master control frequency range.
Preferably, the trigger mechanism of described OI comprises:
Within the transmission cycle of OI, if the time slots more than half of a Resource Block RB are high OI values, setting this RB is high OI value, otherwise set this RB be in/low OI value;
If when having RB more than half to be high OI value among N the RB that preferential frequency range takies, a described N RB is updated to high OI value, otherwise during a described N RB is updated to/hang down the OI value;
Judge whether the OI value after upgrading is identical with the OI value that a upper OI sends the cycle, if, then do not send OI, otherwise, the OI after upgrading sent.
Preferably, step e described with described edge customer scheduling before use on the frequency range, further comprise:
The effective HII that whether receives on the frequency range from adjacent cell is being used in judgement, if, abandon the scheduling to described edge customer, otherwise, send HII to neighbor cell according to the HII trigger mechanism using frequency range, and carry out described with described edge customer scheduling to the step of using on the frequency range.
Preferably, described with after described edge customer scheduling is on using frequency range, further comprise:
Judge whether to receive OI from neighbor cell using frequency range, if then abandon the scheduling to described edge customer.
Preferably, step D described with edge customer scheduling after the preferential frequency range, further comprise: send HII according to the HII trigger mechanism to neighbor cell in preferential frequency range.
Preferably, described in preferential frequency range or use frequency range and send HII according to the HII trigger mechanism to neighbor cell and comprise:
If preferential frequency range or to use the RB that frequency range surpasses half occupied, then the HII with this N RB is updated to effectively, otherwise the HII of this N RB is updated to invalid;
Judge whether the HII value after upgrading is identical with the HII value that a upper HII sends the cycle, if, then do not send HII, otherwise, the HII after upgrading sent.
As can be seen from the above technical solutions, based on the HII/OI Signalling exchange can be real-time the distribution of adjustment cell frequency resources, realize that the optimization of resource is used; Owing to be that coarseness ground sends HII/OI, therefore can reduce signaling consumption.
Description of drawings
Fig. 1 is the coarseness dynamic frequency multiplexing method schematic flow sheet based on HII/OI that the embodiment of the invention proposes;
Fig. 2 is that the edge frequency range of three neighbor cells is divided schematic diagram.
Embodiment
3GPP determines in the Inter-Cell Interference Coordination scheme of up employing based on high interference indication (HII) and overload indication (OI) information.According to the network architecture of evolved universal terrestrial radio access network (E-UTRAN), the wireline interface X2 between the adjacent base station (eNode B) can be used for transmitting HII and OI.An eNode B is when distributing to the subscriber equipment (UE) of a cell edge with a Physical Resource Block (PRB), because predicting this user may disturb neighbor cell, also be subject to easily simultaneously the interference of the UE of neighbor cell, just by HII this responsive PRB circulated a notice of to neighbor cell.ENode B can judge whether this UE is in cell edge by normal Reference Signal Received Power (RSRP) value of measuring in the UE handoff procedure, can certainly make this judgement more accurate by further measurement.After neighbor cell eNode B receives HII, then avoid the cell edge UE of oneself also is dispatched on this PRB, or reduce interference to this PRB as far as possible.When eNode B monitors certain PRB and has been subject to uplink interference, send OI to neighbor cell, indicate this PRB to be interfered.Neighbor cell can be made corresponding adjustment.
According to the 3GPP agreement, HII, OI has following characteristics:
1, the minimum update cycle of HII and OI is 20ms;
2, HII and OI have frequency selectivity, and namely each PRB sends one;
3, OI adopts absolute value representation;
4, OI is divided into Three Estate, represents respectively basic, normal, high interference level.And HII is " forecast " those " responsive " PRB, therefore only represents with 1bit whether this PRB needs Additional Protection to get final product;
5, HII and OI transmit in the mode of " Event triggered ".
It is multiplexing that the present invention program is based on the coarseness dynamic frequency of HII/OI, and at first based on the HII/OI Signalling exchange, adjustresources that can be real-time distributes, and realizes that the optimization of resource is used, and is that coarseness ground sends HII/OI simultaneously, thereby can reduces signaling consumption.
The present invention program's basic thought is as follows: divide by frequency range, the residential quarter available frequency band is divided 2 parts: frequency range centered by the part only allows central user to use; Another part is the edge frequency range, and edge customer only allows to use the edge frequency range, and central user can allow to use the edge frequency range.By criterions such as SIR, path losses community user is divided into edge customer and central user, the frequency reuse of center of housing estate is 1, namely can use whole frequency ranges; The cell edge frequency reuse namely can only be used band segment greater than 1.In order to guarantee that edge customer has enough resources, must guarantee that in dispatching algorithm the use of edge customer edge frequency range has certain priority, so that edge customer is scheduled on the edge frequency range probability is larger, carries out again the resource of central user after first the edge customer resource being distributed and distribute.
Clearer for the characteristics and the technique effect that make technical solution of the present invention, below by specific embodiment the present invention program is described in detail.
The embodiment of the invention propose based on the coarseness dynamic frequency multiplexing method flow process of HII/OI as shown in Figure 1, comprise the steps:
Step 101: the residential quarter available frequency band is divided into center frequency range and edge frequency range, the cell edge frequency range is divided three parts: master control frequency range, preferential frequency range and use frequency range.
The master control frequency range: the master control frequency range between neighbor cell is orthogonal, and the master control frequency range only allows this community user to use.
Preferential frequency range: when two residential quarters all will be dispatched to the user on this frequency range, there was preferential right this residential quarter.
Use frequency range: fully overlapping or overlap with the preferential frequency range of adjacent cell, when this cell edge need to increase available frequency band and adjacent cell and do not use this frequency range (namely not receiving the effective HII of adjacent cell on this frequency range), this frequency range can " be used " to adjacent cell in this residential quarter.
For this community user, the master control frequency range has identical dispatching priority with preferential frequency range, and the dispatching priority of using frequency range is lower than master control frequency range and preferential frequency range.
Fig. 2 shows the edge frequency range of three neighbor cells and divides schematic diagram.Described three neighbor cells are respectively residential quarter 1, residential quarter 2 and residential quarter 3, and its edge frequency range is respectively F1, F2 and F3.The master control frequency range of these three residential quarters is respectively B1, B2 and B3, and as can be seen from Figure 2, B1, B2 and B3 are completely orthogonal.The preferential frequency range of these three residential quarters is respectively b1, b2 and b3, is respectively a1, a2 and a3 and use frequency range.As can be seen from Figure 2, the frequency range a1 that uses of residential quarter 1 overlaps with the preferential frequency range b3 of residential quarter 3, and the frequency range a2 that uses of residential quarter 2 overlaps with the preferential frequency range b1 of residential quarter 1, and the frequency range a3 that uses of residential quarter 3 overlaps with the preferential frequency range b2 of residential quarter 2.
Step 102: judge that the user in the residential quarter is edge customer or central user, if central user, execution in step 109 is dispatched to residential quarter available frequency band and process ends with described central user; If edge customer continues execution in step 103.
Step 103: attempt described edge customer scheduling to master control frequency range or preferential frequency range.If successfully be dispatched to the master control frequency range, then process ends; If described edge customer scheduling to preferential frequency range, is continued execution in step 104.
Concrete scheduling mode can be realized according to equitable proportion algorithm or other dispatching algorithms.Proportional fair scheduling is in order to take into account systematic function and user fairness, to determine the dispatching method of dispatching priority of users according to user's momentary rate and the Mean Speed ratio in certain time slip-window.The embodiment of the invention does not limit concrete dispatching algorithm.
The master control frequency range is identical with the priority of preferential frequency range, but in the time of will being dispatched to the master control frequency range, need not judge whether to receive the HII value; And will be dispatched on the preferential frequency range time, judge the HII value of receiving neighbor cell, and carry out respective handling according to the HII value of receiving.
Step 104: judge whether to receive the effective HII on the preferential frequency range, if not, execution in step 108 arrives preferential frequency range and process ends with edge customer scheduling; If continue execution in step 105.
Step 105: whether the load of judging this residential quarter master control frequency range surpasses the load-threshold that sets in advance, if, execution in step 106, otherwise execution in step 107.
Step 106: according to the level that is disturbed of preferential frequency range, send OI by the OI trigger mechanism, and with described edge customer scheduling to using on the frequency range.
Step 107: with described edge customer scheduling on the master control frequency range.
The user being dispatched to when using on the frequency range, also to judge the HII value of receiving, adjudicate on this frequency range and whether need protection.Can improve the frequency resource utilance of cell edge by using frequency range, when the preferential frequency range of neighbor cell available free (being the HII that the preferential frequency range of adjacent cell is not received in this residential quarter), and this cell edge load is heavier, at this moment just can with the edge customer scheduling of this residential quarter to this residential quarter use frequency range (being the preferential frequency range of neighbor cell), thereby improve frequency efficiency.
The criterion of load is to make comparisons by number of resources and the needed number of resources of user that the residential quarter can provide, because the load that relates in this programme is all on the edge frequency range, so work as the needed total resources number of edge customer greater than a threshold value N (N=16 RB in the emulation, total bandwidth 10M) time, just thinks high capacity.
The trigger mechanism of HII is summarized as follows: preferential frequency range (perhaps using frequency range) is the frequency range of one section N RB, and wherein each RB is on 20 sub-frame of uplink.If it is occupied to surpass the RB of half, we just think that this preferential frequency range (or using frequency range) is high capacity, and when the RB that surpasses half was HII, the HII of this N RB was updated to effectively, otherwise the HII of this N RB is updated to invalid.Judge whether the HII value after upgrading is identical with the HII value that a upper HII sends the cycle, if, then do not send HII, otherwise, the HII after upgrading sent.
The trigger mechanism of described OI is summarized as follows: when adjacent cell has sent HII using frequency range; and this residential quarter is will be dispatched to the user on the preferential frequency range time; find neighbor cell need protection in this frequency range (namely receiving HII); whether the master control frequency range of oneself had load lighter under this residential quarter was judged; if lighter; then the user is dispatched on the master control frequency range, otherwise still the user is dispatched on the preferential frequency range.At this moment neighbor cell has caused interference to this residential quarter using on the frequency range, and the OI grade that need to send according to this residential quarter be made corresponding adjustment, to judge the grade of OI.
A kind of example of judging the OI grade is as follows: establish preferential frequency range and take N RB.For each RB, if the interference of current time slots during greater than predetermined threshold value, just is set as high OI value (for example being set as 1); If the interference of current time slots is during less than this threshold value, in just being set as/low OI value (for example being set as 0).According to the mean value criterion, within the transmission cycle of OI (20ms), are high OI values if time slots more than half are arranged, setting this RB is high OI value, otherwise in being/low OI value; According to the coarseness criterion, when having RB more than half to be high OI value among N the RB, this N RB is updated to high OI value, otherwise in being updated to/low OI value.Judge whether the OI value after upgrading is identical with the OI value that a upper OI sends the cycle, if, then do not send OI, otherwise, the OI after upgrading sent.
The HII/OI trigger mechanism is to adopt coarseness and mean value, in the residential quarter that sends HII/OI, according to the HII/OI update cycle, the every 20ms of HII/OI upgrades once, and the foundation of renewal was the interior frequency range average load of a upper update cycle and the mean value that is disturbed level (considering different target neighbor cell).
In the residential quarter that receives HII/OI, namely upgrade once whenever receiving the HII/OI that adjacent cell sends, if do not receive new HII/OI value always, then give tacit consent to the HII/OI value with present usefulness, until when receiving new HII/OI value, again with new HII/OI value; The residential quarter again during dispatched users, is judged the loading condition of neighbor cell according to the HII/OI information of receiving, thereby is dispatched later on after receiving HII/OI.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. the coarseness dynamic frequency multiplexing method based on high interference indication HII/ overload indication OI is characterized in that, comprises the steps:
A, the residential quarter available frequency band is divided into center frequency range and edge frequency range, the cell edge frequency range is divided three parts: master control frequency range, preferential frequency range and use frequency range; Wherein, master control frequency range between neighbor cell is orthogonal, the preferential frequency range of using frequency range and adjacent cell of this residential quarter is fully overlapping or overlap, for this community user, the master control frequency range has identical dispatching priority with preferential frequency range, and the dispatching priority of using frequency range is lower than master control frequency range and preferential frequency range;
User in B, the judgement residential quarter is edge customer or central user, if central user is dispatched to whole frequency range with described central user; If edge customer continues execution in step C;
C, trial are arrived master control frequency range or preferential frequency range with described edge customer scheduling; If successfully be dispatched to the master control frequency range, then process ends; If described edge customer scheduling to preferential frequency range, is continued execution in step D;
D, judge whether to receive the effective HII on the preferential frequency range, if not, with edge customer scheduling to preferential frequency range and process ends, if continue execution in step E;
E, judge that whether the load of this residential quarter master control frequency range surpasses the load-threshold that sets in advance, if, according to the level that is disturbed of preferential frequency range, send OI by the OI trigger mechanism, and with described edge customer scheduling to using on the frequency range; Otherwise with described edge customer scheduling on the master control frequency range.
2. method according to claim 1 is characterized in that, the trigger mechanism of described OI comprises:
Within the transmission cycle of OI, if the time slots more than half of a Resource Block RB are high OI values, setting this RB is high OI value, otherwise set this RB be in/low OI value;
If when having RB more than half to be high OI value among N the RB that preferential frequency range takies, a described N RB is updated to high OI value, otherwise during a described N RB is updated to/hang down the OI value;
Judge whether the OI value after upgrading is identical with the OI value that a upper OI sends the cycle, if, then do not send OI, otherwise, the OI after upgrading sent.
3. method according to claim 1 is characterized in that, step e described with described edge customer scheduling before use on the frequency range, further comprise:
The effective HII that whether receives on the frequency range from adjacent cell is being used in judgement, if, abandon the scheduling to described edge customer, otherwise, send HII to neighbor cell according to the HII trigger mechanism using frequency range, and carry out described with described edge customer scheduling to the step of using on the frequency range.
4. method according to claim 3 is characterized in that, and is described with after described edge customer scheduling is on using frequency range, further comprises:
Judge whether to receive OI from neighbor cell using frequency range, if then abandon the scheduling to described edge customer.
5. method according to claim 1 is characterized in that, step D described with edge customer scheduling after the preferential frequency range, further comprise: send HII according to the HII trigger mechanism to neighbor cell in preferential frequency range.
6. method according to claim 3 is characterized in that, and is described in preferential frequency range or use frequency range and send HII according to the HII trigger mechanism to neighbor cell and comprise:
If preferential frequency range or to use the RB that frequency range surpasses half occupied, then the HII with this N RB is updated to effectively, otherwise the HII of this N RB is updated to invalid;
Judge whether the HII value after upgrading is identical with the HII value that a upper HII sends the cycle, if, then do not send HII, otherwise, the HII after upgrading sent.
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| CN103648100A (en) * | 2013-11-26 | 2014-03-19 | 重庆邮电大学 | Method and device for coordinating interferences among cells based on TD-LTE (TD-SCDMA Long Term Evolution) trucked communication system |
| CN106550367A (en) * | 2015-09-16 | 2017-03-29 | 普天信息技术有限公司 | A kind of dynamic interference coordination method and base station based on load change |
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| CN101784056A (en) * | 2009-01-20 | 2010-07-21 | 普天信息技术研究院有限公司 | Method for coordinating interference |
| WO2011034960A1 (en) * | 2009-09-15 | 2011-03-24 | Qualcomm Incorporated | Systems and methods for over the air load indicator for wireless scheduling |
| CN102036249A (en) * | 2009-09-24 | 2011-04-27 | 株式会社Ntt都科摩 | Inter-cell interference coordination method and base station |
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| CN101784056A (en) * | 2009-01-20 | 2010-07-21 | 普天信息技术研究院有限公司 | Method for coordinating interference |
| WO2011034960A1 (en) * | 2009-09-15 | 2011-03-24 | Qualcomm Incorporated | Systems and methods for over the air load indicator for wireless scheduling |
| CN102036249A (en) * | 2009-09-24 | 2011-04-27 | 株式会社Ntt都科摩 | Inter-cell interference coordination method and base station |
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| CN103648100A (en) * | 2013-11-26 | 2014-03-19 | 重庆邮电大学 | Method and device for coordinating interferences among cells based on TD-LTE (TD-SCDMA Long Term Evolution) trucked communication system |
| CN106550367A (en) * | 2015-09-16 | 2017-03-29 | 普天信息技术有限公司 | A kind of dynamic interference coordination method and base station based on load change |
| CN106550367B (en) * | 2015-09-16 | 2020-01-31 | 普天信息技术有限公司 | dynamic interference coordination method based on load change and base station |
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