CN102857925B - A kind of coarseness dynamic frequency multiplexing method based on HII/OI - Google Patents
A kind of coarseness dynamic frequency multiplexing method based on HII/OI Download PDFInfo
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Abstract
The invention provides a kind of coarseness dynamic frequency multiplexing method based on high interference instruction (HII)/overload instruction (OI), cell edge frequency range is divided three parts: master control frequency range, preferential frequency range and use frequency range; Judge that the user in community is edge customer or central user, if central user, described central user is dispatched to whole frequency range; If edge customer, attempt described edge customer scheduling to master control frequency range or preferential frequency range; If by described edge customer scheduling to preferential frequency range, judge whether the effective HII received in preferential frequency range, if not, by edge customer scheduling to preferential frequency range; If so, judge whether the load of this community master control frequency range exceedes the load-threshold pre-set, be disturbed level if so, according to preferential frequency range, send OI by overload instruction OI trigger mechanism, and by described edge customer scheduling to using in frequency range; Otherwise by described edge customer scheduling in master control frequency range.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate 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 minizone, carries out certain restriction to the available resources of a community, to improve the signal interference ratio of neighbor cell in these resources (SIR), the data rate of cell edge and covering.Described resource comprises time-domain resource, frequency domain resource and transmitting power.Frequency domain limits the use of resource, makes frequency reuse be greater than 1.
The interference coordination of minizone comprises static state/quasistatic interference coordination and dynamic interference coordination.Static interference coordination mode refers to the negotiation that resource limits and implements to complete when on-premise network, can adjust, but the frequency of adjustment is comparatively slow, is greater than the duration of a service conversation in the period of network operation.More typical static interference coordination mode is the soft-frequency reuse scheme that the company such as Huawei, Siemens proposes.On the basis of static programming, according to the pattern of the factor adjustresources restrictions such as network load, UE measurement situation, form quasistatic interference coordination mode.But no matter be static interference coordination or quasistatic interference coordination, all lack real-time, the Optimum utilization of resource can not be realized.Dynamic interference coordination mode refers to that negotiation that resource limits is at network operation dynamic conditioning in period, and the time scale of adjustment is several to dozens of Transmission Time Intervals (TTI), is less than the duration of a service conversation.Dynamic interference coordination mode needs information interaction frequently, 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, when relatively little minizone expense, real-time Inter-Cell Interference Coordination can be realized.
A kind of coarseness dynamic frequency multiplexing method based on HII/OI that the embodiment of the present invention proposes, is characterized in that, comprise the steps:
A, community available frequency band is divided into center bin and edge frequency range, 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 community is completely overlapping or partly overlap, for this community user, master control frequency range has identical dispatching priority with preferential frequency range, uses the dispatching priority of frequency range lower than master control frequency range and preferential frequency range;
B, the user judged in community are edge customer or central user, if central user, described central user are dispatched to whole frequency range; If edge customer, continue to perform step C;
C, to attempt described edge customer scheduling to master control frequency range or preferential frequency range.If successful dispatch is to master control frequency range, then process ends; If by described edge customer scheduling to preferential frequency range, continue to perform step D;
D, judge whether effective HII of receiving in preferential frequency range, if not, by edge customer scheduling to preferential frequency range and process ends, if so, continue to perform step e;
E, judge whether the load of this community master control frequency range exceedes the load-threshold pre-set, be disturbed level if so, according to preferential frequency range, send OI by OI trigger mechanism, and by described edge customer scheduling to using in frequency range; Otherwise by described edge customer scheduling in 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 to set this RB be medium/low OI value;
If when having RB more than half to be high OI value in N number of RB that preferential frequency range takies, described N number of RB is updated to high OI value, otherwise described N number of RB is updated to medium/low OI value;
Judge that whether the OI value that the OI value after upgrading and a upper OI send the cycle is identical, if so, then do not send OI, otherwise, send the OI after upgrading.
Preferably, described in step e by described edge customer scheduling to before using in frequency range, comprise further:
Judge using the effective HII whether frequency range received from adjacent cell, if so, the scheduling to described edge customer is abandoned, otherwise, send HII to neighbor cell according to HII trigger mechanism using frequency range, and perform described by described edge customer scheduling to the step of using in frequency range.
Preferably, described by described edge customer scheduling to after using in frequency range, comprise further:
Judge whether, using OI frequency range received from neighbor cell, if so, then to abandon the scheduling to described edge customer.
Preferably, by after edge customer scheduling to preferential frequency range described in step D, comprise further: send HII according to HII trigger mechanism to neighbor cell in preferential frequency range.
Preferably, described according to HII trigger mechanism use frequency range to neighbor cell send HII comprise:
If using frequency range, to exceed the RB of half occupied, then the HII of this N number of RB is updated to effectively, otherwise the HII of this N number of RB is updated to invalid;
Judge that whether the HII value that the HII value after upgrading and a upper HII send the cycle is identical, if so, then do not send HII, otherwise, send the HII after upgrading.
As can be seen from the above technical solutions, based on the distribution of adjustment cell frequency resources that HII/OI Signalling exchange can be real-time, the optimization realizing resource uses; Due to be coarseness send HII/OI, therefore can reduce signaling consumption.
Accompanying drawing explanation
Fig. 1 is the coarseness dynamic frequency multiplexing method schematic flow sheet based on HII/OI that the embodiment of the present invention proposes;
Fig. 2 is that the edge frequency range of three neighbor cells divides schematic diagram.
Embodiment
3GPP determines to indicate the Inter-Cell Interference Coordination scheme of (OI) information in up employing based on high interference instruction (HII) and overload.According to the network architecture of evolved universal terrestrial radio access network (E-UTRAN), the wireline interface X2 between adjacent base station (eNodeB) can be used for transmitting HII and OI.An eNodeB is when distributing to subscriber equipment (UE) of a cell edge by a Physical Resource Block (PRB), neighbor cell may be disturbed owing to predicting this user, also be easily subject to the interference of the UE of neighbor cell simultaneously, just by HII, this responsive PRB circulated a notice of to neighbor cell.By Reference Signal Received Power (RSRP) value measured normal in UE handoff procedure, eNodeB can judge whether this UE is in cell edge, this judgement can certainly be made more accurate by further measuring.After neighbor cell eNodeB receives HII, then avoid the cell edge UE of oneself to be also dispatched on this PRB, or reduce the interference to this PRB as far as possible.When eNodeB monitor certain PRB be subject to uplink interference time, send OI to neighbor cell, indicate this PRB to be interfered.Corresponding adjustment can be made in neighbor cell.
According to 3GPP agreement, HII, OI have following characteristics:
1, the minimum update cycle of HII and OI is 20ms;
2, HII and OI has frequency selectivity, and namely each PRB sends one;
3, OI adopts absolute value representation;
4, OI is divided into Three Estate, represents basic, normal, high interference level respectively.And HII just " forecast " those " sensitivities " PRB, therefore only represent that this PRB is the need of Additional Protection with 1bit;
5, HII and OI is with the mode transmission of " event triggering ".
The present invention program is multiplexing based on the coarseness dynamic frequency of HII/OI, and first based on HII/OI Signalling exchange, adjustresources that can be real-time distributes, and the optimization realizing resource uses, be simultaneously coarseness send HII/OI, thus can signaling consumption be reduced.
The basic thought of the present invention program is as follows: divided by frequency range, and community available frequency band is divided 2 parts: frequency range centered by a part, only allows central user to use; Another part is edge frequency range, and edge customer only allows to use edge frequency range, and central user can allow to use edge frequency range.By the criterion such as SIR, path loss, 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 range; Cell-edge frequency re-use is greater than 1, namely can only use band segment.In order to ensure that edge customer has enough resources, must ensure that in dispatching algorithm the use of edge customer edge frequency range has certain priority, make edge customer to be scheduled in edge frequency range probability comparatively large, first will carry out the Resourse Distribute of central user after complete for edge customer Resourse Distribute again.
For making the feature of technical solution of the present invention and technique effect clearly, below by way of specific embodiment, the present invention program is described in detail.
The coarseness dynamic frequency multiplexing method flow process based on HII/OI that the embodiment of the present invention proposes as shown in Figure 1, comprises the steps:
Step 101: community available frequency band is divided into center bin and edge frequency range, cell edge frequency range is divided three parts: master control frequency range, preferential frequency range and use frequency range.
Master control frequency range: the master control frequency range between neighbor cell is orthogonal, master control frequency range only allows this community user to use.
Preferential frequency range: when Liang Ge community all will by user scheduling to this frequency range time, there is preferential right this community.
Use frequency range: completely overlapping with the preferential frequency range of adjacent cell or partly overlap, when this cell edge need to increase available frequency band and adjacent cell do not use this frequency range (namely not receiving the effective HII of adjacent cell in this frequency range) time, this frequency range " can be used " to adjacent cell in this community.
For this community user, master control frequency range has identical dispatching priority with preferential frequency range, uses the dispatching priority of frequency range lower than master control frequency range and preferential frequency range.
The edge frequency range that Fig. 2 shows three neighbor cells divides schematic diagram.Described three neighbor cells are respectively community 1, community 2 and community 3, and its edge frequency range is respectively F1, F2 and F3.The master control frequency range of these three communities 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 communities is respectively b1, b2 and b3, and uses frequency range and be respectively a1, a2 and a3.As can be seen from Figure 2, the frequency range a1 that uses of community 1 overlaps with the preferential frequency range b3 of community 3, and the frequency range a2 that uses of community 2 overlaps with the preferential frequency range b1 of community 1, and the frequency range a3 that uses of community 3 overlaps with the preferential frequency range b2 of community 2.
Step 102: judge that the user in community is edge customer or central user, if central user, performs step 109 and described central user is dispatched to community available frequency band and process ends; If edge customer, continue to perform step 103.
Step 103: attempt described edge customer scheduling to master control frequency range or preferential frequency range.If successful dispatch is to master control frequency range, then process ends; If by described edge customer scheduling to preferential frequency range, continue to perform step 104.
Concrete scheduling mode can realize according to proportional fair algorithm or other dispatching algorithms.Proportional fair scheduling is to take into account systematic function and user fairness, according to the dispatching method of the Mean Speed ratio determination dispatching priority of users in the momentary rate of user and certain time slip-window.The embodiment of the present invention does not limit concrete dispatching algorithm.
The priority of master control frequency range and preferential frequency range is identical, but when will be dispatched to master control frequency range, need not judge whether to receive HII value; And when will be dispatched in preferential frequency range, the HII value receiving neighbor cell be judged, and carry out respective handling according to received HII value.
Step 104: judge whether the effective HII received in preferential frequency range, if not, performs step 108 by edge customer scheduling to preferential frequency range and process ends; If so, continue to perform step 105.
Step 105: judge whether the load of this community master control frequency range exceedes the load-threshold pre-set, if so, performs step 106, otherwise performs step 107.
Step 106: be disturbed level according to preferential frequency range, sends OI by OI trigger mechanism, and by described edge customer scheduling to using in frequency range.
Step 107: by described edge customer scheduling in master control frequency range.
By user scheduling to when using in frequency range, the HII value received also will will be judged, adjudicates in this frequency range the need of protection.The frequency resource utilance of cell edge can be improved by using frequency range, when the preferential frequency range of neighbor cell available free (Ji Zhe community does not receive the HII of the preferential frequency range of adjacent cell), and this cell edge load is heavier, at this moment just the edge customer scheduling of this community can be used frequency range (i.e. the preferential frequency range of neighbor cell) to this community, thus improve frequency efficiency.
The criterion of load is that the number of resources required for number of resources and user that can be provided by community is made comparisons, because the load related in this programme is all in edge frequency range, so when total resources number required for edge customer is greater than a threshold value N (N=16 RB in emulation, total bandwidth 10M) time, just think high capacity.
The trigger mechanism of HII is summarized as follows: preferential frequency range (or using frequency range) is the frequency range of one section of N number of RB, and wherein each RB is on 20 sub-frame of uplink.If the RB exceeding half is occupied, we just think that this preferential frequency range (or using frequency range) is high capacity, and when the RB exceeding half is HII, the HII of this N number of RB is updated to effectively, otherwise the HII of this N number of RB is updated to invalid.Judge that whether the HII value that the HII value after upgrading and a upper HII send the cycle is identical, if so, then do not send HII, otherwise, send the HII after upgrading.
The trigger mechanism of described OI is summarized as follows: when adjacent cell have sent HII using in frequency range; and this community will by user scheduling to preferential frequency range time; find that neighbor cell needs to protect (namely receiving HII) in this frequency range; under this community judges, whether the master control frequency range of oneself has load lighter; if lighter; then by user scheduling in master control frequency range, otherwise still by user scheduling in preferential frequency range.At this moment neighbor cell causes interference using frequency range Shang Duizhe community, needs the OI grade sent according to this community, makes corresponding adjustment, to judge the grade of OI.
Judge that a kind of example of OI grade is as follows: establish preferential frequency range to take N number of RB.For each RB, if when the interference of current time slots is greater than predetermined threshold value, be just set as high OI value (being such as set as 1); If when the interference of current time slots is less than this threshold value, be just set as medium/low OI value (being such as set as 0).According to mean value criterion, within the transmission cycle (20ms) of OI, if there is time slot more than half to be high OI value, setting this RB is high OI value, otherwise is medium/low OI value; According to coarseness criterion, when having RB more than half to be high OI value in N number of RB, this N number of RB is updated to high OI value, otherwise is updated to medium/low OI value.Judge that whether the OI value that the OI value after upgrading and a upper OI send the cycle is identical, if so, then do not send OI, otherwise, send the OI after upgrading.
HII/OI trigger mechanism adopts coarseness and mean value, sending the community of HII/OI, according to the HII/OI update cycle, the every 20ms of HII/OI upgrades once, and the foundation of renewal was frequency range average load in the upper update cycle and the mean value being disturbed level (considering different target neighbor cell).
Receiving the community of HII/OI, namely upgrading once whenever receiving the HII/OI that adjacent cell sends, if do not receive new HII/OI value always, then giving tacit consent to by present HII/OI value, until when receiving new HII/OI value, then by new HII/OI value; Community after receiving HII/OI, later again dispatched users time, judge the loading condition of neighbor cell according to the HII/OI information received, thus dispatch.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1., based on a coarseness dynamic frequency multiplexing method of high interference instruction HII/ overload instruction OI, it is characterized in that, comprise the steps:
A, community available frequency band is divided into center bin and edge frequency range, 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 community is completely overlapping or partly overlap, for this community user, master control frequency range has identical dispatching priority with preferential frequency range, uses the dispatching priority of frequency range lower than master control frequency range and preferential frequency range;
B, the user judged in community are edge customer or central user, if central user, described central user are dispatched to whole frequency range; If edge customer, continue to perform step C;
C, to attempt described edge customer scheduling to master control frequency range or preferential frequency range; If successful dispatch is to master control frequency range, then process ends; If by described edge customer scheduling to preferential frequency range, continue to perform step D;
D, judge whether effective HII of receiving in preferential frequency range, if not, by edge customer scheduling to preferential frequency range and process ends, if so, continue to perform step e;
E, judge whether the load of this community master control frequency range exceedes the load-threshold pre-set, be disturbed level if so, according to preferential frequency range, send OI by OI trigger mechanism, and by described edge customer scheduling to using in frequency range; Otherwise by described edge customer scheduling in 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 to set this RB be medium/low OI value;
If when having RB more than half to be high OI value in N number of RB that preferential frequency range takies, described N number of RB is updated to high OI value, otherwise described N number of RB is updated to medium/low OI value;
Judge that whether the OI value that the OI value after upgrading and a upper OI send the cycle is identical, if so, then do not send OI, otherwise, send the OI after upgrading.
3. method according to claim 1, is characterized in that, described in step e by described edge customer scheduling to before using in frequency range, comprise further:
Judge using the effective HII whether frequency range received from adjacent cell, if so, the scheduling to described edge customer is abandoned, otherwise, send HII to neighbor cell according to HII trigger mechanism using frequency range, and perform described by described edge customer scheduling to the step of using in frequency range.
4. method according to claim 3, is characterized in that, described by described edge customer scheduling to after using in frequency range, comprise further:
Judge whether, using OI frequency range received from neighbor cell, if so, then to abandon the scheduling to described edge customer.
5. method according to claim 1, is characterized in that, by after edge customer scheduling to preferential frequency range described in step D, comprises further: send HII according to HII trigger mechanism to neighbor cell in preferential frequency range.
6. method according to claim 3, is characterized in that, described according to HII trigger mechanism use frequency range to neighbor cell send HII comprise:
If using frequency range, to exceed the RB of half occupied, then the HII of this N number of RB is updated to effectively, otherwise the HII of this N number of RB is updated to invalid;
Judge that whether the HII value that the HII value after upgrading and a upper HII send the cycle is identical, if so, then do not send HII, otherwise, send the HII after upgrading.
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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 |
| 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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