CN102917462A - Interference coordination method in heterogeneous network - Google Patents
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Abstract
The invention provides an interference coordination method in a heterogeneous network; and the method comprises the following steps of: through a micro base station pico eNB, receiving intensity RSRP (Reference Signal Received Power) according to a reference signal fed back by user equipment UE, so as to determine high interference users; determining a high interference user to be dispatched in the high interference users; judging that the current main control carrier PCC is overloaded according to the high interference user to be dispatched; selecting an optimal sub carrier as a new added PCC; judging that the current main control carrier PCC is light-loaded according to the high interference user to be dispatched; selecting a worst sub carrier as PCC to be reduced; feeding back adjusted PCC to macro eNB through an X2 interface between pico eNB and a micro base station macro eNB; and updating an available PCC list by macro eNB. After the embodiment of the invention is applied, the interference born by the main control carrier can be reduced, so that the performance of the system is improved.
Description
Technical field
The present invention relates to communication technical field, more specifically, relate to the method for interference coordination in a kind of heterogeneous network.
Background technology
Existing studies show that introduced heterogeneous network in advanced (LTE-advanced) system of Long Term Evolution.Heterogeneous network refers to that macrocell lower floor has also disposed Microcell.Such as long-distance radio frequency unit (RRH), little base station (Pico eNB), Home eNodeB (Home eNB) and relay base station (relay eNB).Typically heterogeneous network has two kinds of deployment way.A kind of is macrocell (macro cell)+home base station cells (femto cell), and another kind is macro cell+ picocell (pico cell) or relaying residential quarter (relay cell).The introducing of Microcell has caused more cell border areas, thereby causes extra interference.Unbalanced power between macrocell and the Microcell causes particularly serious interference to the UE that is in cell border areas.All there is serious interference problem in above-mentioned two kinds of deployment way.
In the deployment way of macro cell+pico cell or relay cell, disturb and mainly come from distributed area expansion (range expansion).Range expansion uses the reference signal receiving intensity (RSRP) that is different from the tradition access in order to alleviate the macro base station burden.Specifically, UE is when judging access macrocell or Microcell, at the signal strength signal intensity RSRP from Microcell
MicroA side-play amount of upper increase (bias), bias is positive number, bias is normally configured by upper layer device.RSRP
MicroUpper increase bias again with signal strength signal intensity RSRP from macrocell
MacroRelatively, if RSRP
Micro+ bias 〉=RSRP
Macro, then UE selects the access Microcell; Otherwise UE selects the access macrocell.
Use range expansion technology, the UE in the accompanying drawing 1 in the Microcell extended region can suffer severe jamming.Its reason is, comes from the one hand from the weakening of Microcell signal receiving strength, and comes from the other hand the enhancing from the macrocell interference signal.The result is in the possibility that UE in the Microcell extended region scope can not correctly receive signal to be increased greatly, has further caused throughput of system decline.
How effectively to alleviate and even eliminate Microcell and introduce the key that the interference bring especially improves the LTE-advanced systematic function, improves throughput.Although the interference coordination solution of the data channel that Release8/9 provides can be continued to use, but still there is the interference problem of control channel.
In the middle of the prior art, utilize the interference coordination between multicarrier realization macro base station (macro eNB) and pico eNB.For example, two carrier wave f1 and f2, macro base station be to being little UE away from user (UE) under little base station of little base station, can be on any one carrier wave control channel and data message.To being grand UE near UE under the macro base station of little base station, and near little UE of macro base station, control information need to be transmitted at different carrier waves, and data message then can transmit at any carrier wave.
In view of interference problem serious under the heterogeneous network, when utilizing multicarrier to alleviate macro base station to the interference of little base station one side control channel, macro base station and little base station all need to configure the master control carrier wave.Namely need to determine for being disturbed more serious UE, transmitting physical downlink channel control on which carrier wave (PDCCH), which does not pass PDCCH.Because the master control carrier wave of macro base station and the configuration of little base station can not be on same carrier wave.The master control carrier wave that reduces little base station just can transmit at other carrier wave the master control carrier wave of macro base station, thereby can improve the dispatching flexibility of macro base station, further elevator system performance.
Because the decline situation that UE faces on different carrier and the interference that suffers are different, select arbitrarily carrier wave as the master control carrier wave, the master control carrier wave still is interfered.
Summary of the invention
The embodiment of the invention proposes the method for interference coordination in a kind of heterogeneous network, can reduce the suffered interference of master control carrier wave, thus the elevator system performance.
The technical scheme of the embodiment of the invention is as follows:
The method of interference coordination in a kind of heterogeneous network, the method comprises:
Little base station Pico eNB determines the high interference user based on the reference signal receiving intensity RSRP of user UE feedback, determines high interference user to be dispatched in the high interference user;
Judge existing master control carrier wave PCC overload according to high interference user to be dispatched, select optimum subcarrier as newly-increased PCC;
Pico eNB by and macro base station Macro eNB between X2 interface to Macro eNB feedback adjusting PCC, Macro eNB upgrades available PCC tabulation.
Described definite high interference user comprises: described high interference user from the RSRP of macro eNB and described high interference user from the difference of the RSRP of pico eNB greater than the first default threshold value.
Described basis high interference user to be dispatched judges that existing master control carrier wave overload comprises: high interference number of users to be dispatched is greater than the bearing capacity of the physical downlink control channel PDCCH of existing master control carrier wave.
Described basis high interference user to be dispatched judges that existing master control carrier wave overload comprises: high interference user to be dispatched uses the control channel Elements C CE percentage of the PDCCH that has the master control carrier wave now greater than the second default threshold value.
Described optimum subcarrier is the maximum subcarrier of high interference user that is in more excellent channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: the maximum newly-increased PCC of subcarrier conduct of high interference number of users that selects to be in more excellent channel status according to high interference user's channel status.
The subcarrier of the assembly average maximum that described optimum subcarrier is channel status, the optimum subcarrier of described selection comprises as newly-increased PCC: according to the subcarrier of the assembly average maximum of the assembly average selective channel state of high interference user's channel status as newly-increased PCC.
Described assembly average comprises: the effective Signal to Interference plus Noise Ratio mapping of linear average or index EESM.
Described high interference user's channel status is determined by RSRP and the Reference Signal Received Quality RSRQ of high interference user feedback.
Described high interference user's channel status is determined by the channel quality indicator (CQI) of network broadband.
By the RSRP of high interference user feedback and RSRQ as the rough estimate evaluation; The thin estimated value of CQI conduct by network broadband; Determine described high interference user's channel status according to described rough estimate evaluation and described thin estimated value.
Described basis further comprises after the high interference user judges the existing non-overload of master control carrier wave PCC wait dispatching: judge existing master control carrier wave underloading according to high interference user to be dispatched, select the poorest subcarrier as PCC to be reduced.
Described Macro eNB further comprises after upgrading available PCC tabulation: Macro eNB adjusts the PCC of self according to available PCC tabulation.
Can find out from technique scheme, in embodiments of the present invention, pico eNB determines the high interference user based on the RSRP of UE feedback, determines high interference user to be dispatched in the high interference user; Judge existing master control carrier wave overload according to high interference user to be dispatched, select optimum subcarrier as newly-increased PCC; Judge existing master control carrier wave underloading according to high interference user to be dispatched, select the poorest subcarrier as PCC to be reduced; Pico eNB by and macro eNB between X2 interface to macro eNB feedback adjusting PCC, macro eNB upgrades available PCC tabulation.Because pico eNB adjusts the master control carrier wave according to the high interference user, again the master control carrier wave of adjusting is informed macro eNB, avoided the relatively poor carrier wave of channel conditions and selective channel situation preferably carrier wave as the master control carrier wave.Reduced so the suffered interference of master control carrier wave, the elevator system performance.
Description of drawings
Fig. 1 is the UE that is in extended area in the prior art schematic diagram that is interfered;
Fig. 2 is the method flow schematic diagram of interference coordination in the embodiment of the invention heterogeneous network.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
In embodiments of the present invention, judge existing main carrier overload according to high interference user to be dispatched, then select optimum subcarrier as newly-increased PCC, like this carry out carrier wave when configuration just avoid the relatively poor carrier wave of channel conditions and selective channel situation preferably carrier wave increased the high interference user's that can dispatch on this master control carrier wave PDCCH number as the master control carrier wave.Make this PDCCH carry more UE, can reduce the master control number of carriers, avoid unnecessary increase master control number of carriers, promote thereby be conducive to systematic function.
Are method flow schematic diagrames of interference coordination in the heterogeneous network referring to accompanying drawing 2, specifically may further comprise the steps:
Pico eNB classifies to the UE of its service, and the UE set omega that each pico eNB connects is divided into the UE set of two classifications: be disturbed more serious UE, i.e. high interference user set omega
HighBe disturbed weak UE, i.e. low interference user set omega
Low, and Ω=Ω is arranged
High∪ Ω
Low
Pico eNB determines high interference user and low interference user based on the RSRP of UE feedback.High interference user be from the RSRP of macro eNB with from the difference of the RSRP of the pico eNB user greater than default the first threshold value, i.e. Ω
High={ j|RSRP
j-RSRP
j〉=RSRP
Threshold, j ∈ Ω }, RSRP
ThresholdIt is default the first threshold value; Low interference user be from the RSRP of macro eNB with from the difference of the RSRP of pico eNB less than or equal to the user who presets the first threshold value, i.e. Ω
Low={ j|RSRP
j-RSRP
j≤ RSRP
Threshold, j ∈ Ω }.High interference user is for need strengthening the user of interference coordination, namely must be on the master control carrier wave user of scheduled transmission.Low interference user is not for needing to strengthen the user of interference coordination, namely can be on other carrier wave the user of scheduled transmission.
After high interference user determines, in the high interference user, determine high interference user to be scheduled, high interference user namely to be dispatched.
Judge existing master control carrier wave overload according to high interference user to be dispatched, then execution in step 203; Otherwise, execution in step 204.
Judge according to high interference user to be dispatched whether existing master control carrier wave is loaded with following dual mode excessively.
Mode one
If high interference number of users to be dispatched, is then determined existing master control carrier wave overload greater than the bearing capacity of the Physical Downlink Control Channel (PDCCH) of existing master control carrier wave; Otherwise, determine the existing non-overload of master control carrier wave.
Mode two
If high interference user to be dispatched uses the percentage of control channel element (CCE) of PDCCH of existing master control carrier wave greater than the second default threshold value, then determine existing master control carrier wave overload; Otherwise, if high interference user to be dispatched uses the percentage of CCE of PDCCH of existing master control carrier wave less than or equal to the second default threshold value, then judge the existing non-overload of master control carrier wave.
Select optimum subcarrier to comprise following dual mode as newly-increased master control carrier wave:
Mode A: the number that is in the high interference user of more excellent channel status according to high interference user's channel status statistics, be in high interference user's the number of more excellent channel status greater than the 3rd default threshold value, select to be in the maximum subcarrier of high interference user's the number of more excellent channel status as newly-increased master control carrier wave.Wherein, more excellent channel status is that the high interference user's that calculates according to following a, b or c channel status is more than or equal to the 4th default threshold value.
Mode B: select optimum subcarrier as newly-increased master control carrier wave according to the assembly average of high interference user's channel status.Wherein, assembly average comprises effectively new dried the making an uproar than mapping EESM of linear average or index.Namely to descending ordering of assembly average corresponding to subcarrier, choosing subcarrier corresponding to maximum is that optimum subcarrier is as newly-increased master control carrier wave.
The channel status of high interference user among mode A and the mode B can be determined according to following three kinds of situations.
A, high interference user's channel status is determined by RSRP and the Reference Signal Received Quality (RSRQ) of high interference user feedback.
B, high interference user's channel status is determined by the channel quality indication (CQI) of network broadband.
C, by the RSRP of high interference user feedback and RSRQ as the rough estimate evaluation; The thin estimated value of CQI conduct by network broadband; Determine described high interference user's channel status according to rough estimate evaluation and thin estimated value.
Above-mentioned a, b and three kinds of definite high interference users' of c channel status is prior art, repeats no more.
If high interference user to be dispatched uses the percentage of CCE of PDCCH of existing master control carrier wave less than or equal to the 5th default threshold value, then determine existing master control carrier wave underloading; Otherwise, if high interference user to be dispatched uses the percentage of CCE of PDCCH of existing master control carrier wave greater than the 5th default threshold value, then judge the existing non-underloading of master control carrier wave, return step 202.Wherein, the 5th threshold value is less than the second threshold value.
Select the poorest subcarrier to comprise following dual mode as master control carrier wave to be reduced, i.e. mode A in the step 203 and mode B.
Mode A: be in the high interference user's of poor channel state number according to high interference user's channel status statistics, and selection is in the high interference user's of poor channel state the maximum subcarrier conduct master control carrier wave to be reduced of number.Wherein, poor channel state refers to that the high interference user's that calculates according to a, b or c in the step 203 channel status is less than or equal to the 4th default threshold value.
Mode B: select the poorest subcarrier as master control carrier wave to be reduced according to the assembly average of high interference user's channel status.Wherein, assembly average comprises effectively new dried the making an uproar than mapping EESM of linear average or index.Namely to descending ordering of assembly average corresponding to subcarrier, choose the i.e. the poorest subcarrier conduct master control carrier wave to be reduced of subcarrier corresponding to minimum value.
To macro eNB feedback adjusting master control carrier wave, macro eNB upgrades available master control carrier list by X2 interface for step 206, pico eNB.
Pico eNB by and macro eNB between X2 interface, to macro eNB feedback adjusting master control carrier wave.Macro base station receives the feedback information that pico eNB sends, in view of the pico eNB quantity of cell coverage area, adjusting needs the regular hour, therefore needs to be adjusted the finishing such as regular hour, after the wait, macro eNB upgrades available master control carrier list.
Macro eNB determines self available master control carrier wave according to pico eNB feedback.And judge whether the master control carrier wave transships, to adjust the master control carrier wave of self.
Wherein, judge that the process whether the master control carrier wave transship is identical with step 202.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the method for interference coordination in the heterogeneous network is characterized in that, the method comprises:
Little base station Pico eNB determines the high interference user based on the reference signal receiving intensity RSRP of user UE feedback, determines high interference user to be dispatched in the high interference user;
Judge existing master control carrier wave PCC overload according to high interference user to be dispatched, select optimum subcarrier as newly-increased PCC;
Pico eNB by and macro base station Macro eNB between X2 interface to Macro eNB feedback adjusting PCC, Macro eNB upgrades available PCC tabulation.
2. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, described definite high interference user comprises: described high interference user from the RSRP of macro eNB and described high interference user from the difference of the RSRP of pico eNB greater than the first default threshold value.
3. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, described basis high interference user to be dispatched judges that existing master control carrier wave overload comprises: high interference number of users to be dispatched is greater than the bearing capacity of the physical downlink control channel PDCCH of existing master control carrier wave.
4. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, described basis high interference user to be dispatched judges that existing master control carrier wave overload comprises: high interference user to be dispatched uses the control channel Elements C CE percentage of the PDCCH that has the master control carrier wave now greater than the second default threshold value.
5. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, described optimum subcarrier is the maximum subcarrier of high interference user that is in more excellent channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: the maximum newly-increased PCC of subcarrier conduct of high interference number of users that selects to be in more excellent channel status according to high interference user's channel status.
6. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, the subcarrier of the assembly average maximum that described optimum subcarrier is channel status, the optimum subcarrier of described selection comprises as newly-increased PCC: according to the subcarrier of the assembly average maximum of the assembly average selective channel state of high interference user's channel status as newly-increased PCC.
7. the method for interference coordination in the described heterogeneous network according to claim 6 is characterized in that, described assembly average comprises: the effective Signal to Interference plus Noise Ratio mapping of linear average or index EESM.
8. the method for interference coordination according to claim 5 or in the 6 described heterogeneous networks is characterized in that, described high interference user's channel status is determined by RSRP and the Reference Signal Received Quality RSRQ of high interference user feedback.
9. the method for interference coordination according to claim 5 or in the 6 described heterogeneous networks is characterized in that, described high interference user's channel status is determined by the channel quality indicator (CQI) of network broadband.
10. the method for interference coordination according to claim 5 or in the 6 described heterogeneous networks is characterized in that, by the RSRP of high interference user feedback and RSRQ as the rough estimate evaluation; The thin estimated value of CQI conduct by network broadband; Determine described high interference user's channel status according to described rough estimate evaluation and described thin estimated value.
11. the method for interference coordination in the described heterogeneous network according to claim 1, it is characterized in that, described basis further comprises after the high interference user judges the existing non-overload of master control carrier wave PCC wait dispatching: judge existing master control carrier wave underloading according to high interference user to be dispatched, select the poorest subcarrier as PCC to be reduced.
12. the method for interference coordination in the described heterogeneous network is characterized in that according to claim 1, described Macro eNB further comprises after upgrading available PCC tabulation: Macro eNB adjusts the PCC of self according to available PCC tabulation.
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| CN111148249A (en) * | 2019-12-24 | 2020-05-12 | 深圳大学 | Network resource allocation method and device |
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