CN102917462B - Interference coordination method in heterogeneous network - Google Patents
Interference coordination method in heterogeneous network Download PDFInfo
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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
Now there are some researches show, in Long Term Evolution advanced person (LTE-advanced) system, introduce heterogeneous network.Heterogeneous network refers to that macrocell lower floor also deploys Microcell.As long-distance radio frequency unit (RRH), micro-base station (PicoeNB), Home eNodeB (Home eNB) and relay base station (relay eNB).Typically heterogeneous network has two kinds of deployment way.One is macrocell (macro cell)+home base station cells (femto cell), and another kind is macro cell+ picocell (pico cell) or relaying cell (relay cell).The introducing of Microcell result in more cell border areas, thus causes extra interference.Unbalanced power between macrocell and Microcell causes particularly serious interference to the UE being 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, interference mainly comes from distributed area and expands (range expansion).Range expansion uses to alleviate macro base station burden the reference signal receiving intensity (RSRP) being different from tradition access.Specifically, UE judge access macrocell or Microcell time, at the signal strength signal intensity RSRP from Microcell
microupper increase side-play amount (bias), bias is positive number, and bias is normally configured by upper layer device.RSRP
microupper increase bias again with the signal strength signal intensity RSRP from macrocell
macrorelatively, if RSRP
micro+ bias>=RSRP
macro, then UE selects access Microcell; Otherwise UE selects access macrocell.
Use range expansion technology, the UE in accompanying drawing 1 in the extended region of Microcell can suffer severe jamming.Its reason is, comes from weakening from Microcell signal receiving strength on the one hand, comes from the enhancing from macrocell interference signal on the other hand.Result is in UE within the scope of the extended region of Microcell can not the possibility of correct Received signal strength be increased greatly, further causes throughput of system and declines.
How effectively to alleviate and even eliminate Microcell and introduce the key that the interference brought especially improves LTE-advanced systematic function, raising 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 prior art, utilize the interference coordination that multicarrier realizes between macro base station (macro eNB) and pico eNB.Such as, two carrier wave f1 and f2, macro base station to the micro-UE in micro-base station owning user (UE) i.e. away from micro-base station, can on any one carrier wave control channel and data message.To UE and grand UE belonging to the macro base station near micro-base station, and near micro-UE of macro base station, control information needs to transmit on different carrier waves, and data message then can transmit on any carrier wave.
In view of interference problem serious under heterogeneous network, when utilizing multicarrier to alleviate the interference of macro base station to side, micro-base station control channel, macro base station and micro-base station all need configuration master control carrier wave.Namely need to determine for being disturbed more serious UE, transmitting physical downlink channel control (PDCCH) on which carrier wave, which does not pass PDCCH.Because the master control carrier wave of macro base station and the configuration of micro-base station can not on same carrier wave.The master control carrier wave reducing micro-base station just can transmit the master control carrier wave of macro base station on other carrier wave, thus can improve the dispatching flexibility of macro base station, further elevator system performance.
The fading case faced on different carrier due to UE and the interference difference suffered, select arbitrarily carrier wave as master control carrier wave, master control carrier wave is still interfered.
Summary of the invention
The embodiment of the present invention proposes the method for interference coordination in a kind of heterogeneous network, can reduce the interference suffered by master control carrier wave, thus elevator system performance.
The technical scheme of the embodiment of the present invention is as follows:
A method for interference coordination in heterogeneous network, the method comprises:
The reference signal receiving intensity RSRP that micro-base station Pico eNB feeds back based on user UE determines high interference user, determines to treat scheduling high interference user in high interference user;
According to treating that scheduling high interference user judges that existing master control carrier wave PCC transships, select optimum subcarrier as newly-increased PCC;
Pico eNB upgrades available PCC list by the X2 interface between macro base station Macro eNB to Macro eNB feedback adjusting PCC, Macro eNB.
Describedly determine that high interference user comprises: described high interference user is greater than the first default threshold value from the RSRP of macro eNB and described high interference user from the difference of the RSRP of pico eNB.
Described basis waits that dispatching high interference user judges that existing master control carrier wave overload comprises: treat that scheduling high interference number of users is greater than the bearing capacity of the physical downlink control channel PDCCH of existing master control carrier wave.
Described basis treats that scheduling high interference user judges that existing master control carrier wave overload comprises: treat that scheduling high interference user uses the control channel Elements C CE percentage of the PDCCH of existing master control carrier wave to be greater than the second default threshold value.
Described optimum subcarrier is in the maximum subcarrier of the high interference user of more excellent channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: the maximum subcarrier of the high interference number of users selecting to be in more excellent channel status according to the channel status of high interference user is as newly-increased PCC.
Described optimum subcarrier is the maximum subcarrier of the assembly average of channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: according to the maximum subcarrier of the assembly average of the assembly average selective channel state of the channel status of high interference user as newly-increased PCC.
Described assembly average comprises: linear average or the effective Signal to Interference plus Noise Ratio of index map EESM.
The channel status of described high interference user is determined by the RSRP of high interference user feedback and Reference Signal Received Quality RSRQ.
The channel status of described high interference user is determined by the channel quality indicator (CQI) of network broadband.
By RSRP and RSRQ of high interference user feedback as rough estimate evaluation; By the CQI of network broadband as thin estimated value; The channel status of described high interference user is determined according to described rough estimate evaluation and described thin estimated value.
Described basis comprises further after scheduling high interference user judges existing master control carrier wave PCC non-overloaded: according to treating that scheduling high interference user judges existing master control carrier wave underloading, select the poorest subcarrier to reduce PCC as waiting.
Described Macro eNB comprises after upgrading available PCC list further: Macro eNB is according to the PCC of available PCC list adjustment self.
As can be seen from technique scheme, in embodiments of the present invention, pico eNB determines high interference user based on the RSRP that UE feeds back, and determines to treat scheduling high interference user in high interference user; According to treating that scheduling high interference user judges that existing master control carrier wave transships, select optimum subcarrier as newly-increased PCC; According to treating that scheduling high interference user judges existing master control carrier wave underloading, the poorest subcarrier is selected to reduce PCC as waiting; Pico eNB upgrades available PCC list by the X2 interface between macro eNB to macro eNB feedback adjusting PCC, macroeNB.Because pico eNB adjusts master control carrier wave according to high interference user, then adjusted master control carrier wave is informed macro eNB, avoid the poor carrier wave of channel conditions and the good carrier wave of selective channel situation as master control carrier wave.Which decrease the interference suffered by master control carrier wave, elevator system performance.
Accompanying drawing explanation
Fig. 1 is that the UE being in extended area in prior art is interfered schematic diagram;
Fig. 2 is the method flow schematic diagram of interference coordination in embodiment of the present invention heterogeneous network.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, according to treating that scheduling high interference user judges that existing main carrier transships, then select optimum subcarrier as newly-increased PCC, like this carry out carrier wave configuration time just avoid the poor carrier wave of channel conditions and the good carrier wave of selective channel situation as master control carrier wave, add the number of the high interference user that this master control carrier wave PDCCH can dispatch.Make this PDCCH carry more UE, master control number of carriers can be reduced, avoid unnecessary increase master control number of carriers, thus be conducive to systematic function lifting.
See the method flow schematic diagram that accompanying drawing 2 is interference coordinations in heterogeneous network, specifically comprise the following steps:
Step 201, pico eNB determine high interference user based on the RSRP that UE feeds back, and determine to treat scheduling high interference user in high interference user.
Pico eNB classifies to the UE that it is served, 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
high; Be disturbed more weak UE, i.e. low interference user set omega
low, and have Ω=Ω
high∪ Ω
low.
Pico eNB determines high interference user and low interference user based on the RSRP that UE feeds back.High interference user is the user that the RSRP from macro eNB and the difference from the RSRP of pico eNB are greater than default first threshold value, i.e. Ω
high={ j|RSRP
j-RSRP
j>=RSRP
threshold, j ∈ Ω }, RSRP
thresholdit is default first threshold value; Low interference user is the user that the RSRP from macro eNB and the difference from the RSRP of pico eNB are less than or equal to default first threshold value, i.e. Ω
low={ j|RSRP
j-RSRP
j≤ RSRP
threshold, j ∈ Ω }.High interference user needs to strengthen the user of interference coordination, namely must on master control carrier wave the user of scheduled transmission.Low interference user is do not need to strengthen the user of interference coordination, namely can on other carrier wave the user of scheduled transmission.
After high interference user determines, in high interference user, determine high interference user to be scheduled, namely treat scheduling high interference user.
Step 202, basis treat that scheduling high interference user judges that existing master control carrier wave transships.
According to treating that scheduling high interference user judges that existing master control carrier wave transships, then perform step 203; Otherwise, perform step 204.
According to treating that scheduling high interference user judges whether existing master control carrier wave is crossed and is loaded with following two kinds of modes.
Mode one
Dispatch the bearing capacity that high interference number of users is greater than the Physical Downlink Control Channel (PDCCH) of existing master control carrier wave if wait, then determine that existing master control carrier wave transships; Otherwise, determine existing master control carrier wave non-overloaded.
Mode two
If treat, scheduling high interference user uses the percentage of the control channel element (CCE) of the PDCCH of existing master control carrier wave to be greater than the second default threshold value, then determine that existing master control carrier wave transships; Otherwise if treat, scheduling high interference user uses the percentage of the CCE of the PDCCH of existing master control carrier wave to be less than or equal to the second default threshold value, then judge existing master control carrier wave non-overloaded.
Step 203, select optimum subcarrier as newly-increased master control carrier wave.
Optimum subcarrier is selected to comprise following two kinds of modes as newly-increased master control carrier wave:
Mode A: the number being in the high interference user of more excellent channel status according to the channel status statistics of high interference user, the number being in the high interference user of more excellent channel status is greater than the 3rd default threshold value, selects to be in the maximum subcarrier of the number of the high interference user of more excellent channel status as newly-increased master control carrier wave.Wherein, more excellent channel status is that the channel status of the high interference user calculated according to following a, b or c 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 the channel status of high interference user.Wherein, assembly average comprises that linear average or index are effectively newly dry makes an uproar than mapping EESM.Namely the assembly average that sub-carrier is corresponding is descending to sort, and chooses subcarrier corresponding to maximum and optimum subcarrier as newly-increased master control carrier wave.
The channel status of the high interference user in mode A and mode B can be determined according to following three kinds of situations.
The channel status of a, high interference user is determined by the RSRP of high interference user feedback and Reference Signal Received Quality (RSRQ).
The channel status of b, high interference user indicates (CQI) to determine by the channel quality of network broadband.
C, by RSRP and RSRQ of high interference user feedback as rough estimate evaluation; By the CQI of network broadband as thin estimated value; The channel status of described high interference user is determined according to rough estimate evaluation and thin estimated value.
Above-mentioned a, b and c tri-kinds determines that the channel status of high interference user is prior art, repeats no more.
Step 204, basis treat that scheduling high interference user judges existing master control carrier wave underloading.
If treat, scheduling high interference user uses the percentage of the CCE of the PDCCH of existing master control carrier wave to be less than or equal to the 5th default threshold value, then determine existing master control carrier wave underloading; Otherwise if treat, scheduling high interference user uses the percentage of the CCE of the PDCCH of existing master control carrier wave to be greater than the 5th default threshold value, then judge the non-underloading of existing master control carrier wave, return step 202.Wherein, the 5th threshold value is less than the second threshold value.
Step 205, the poorest subcarrier of selection reduce master control carrier wave as waiting.
Select the poorest subcarrier as waiting that reducing master control carrier wave comprises following two kinds of modes, the mode A namely in step 203 and mode B.
Mode A: the number being in the high interference user of poor channel state according to the channel status of high interference user statistics, and the maximum subcarrier of the number selecting to be in the high interference user of poor channel state reduces master control carrier wave as waiting.Wherein, poor channel state refers to that the channel status of the high interference user calculated according to a, b or c in step 203 is less than or equal to the 4th default threshold value.
Mode B: select the poorest subcarrier to reduce master control carrier wave as waiting according to the assembly average of the channel status of high interference user.Wherein, assembly average comprises that linear average or index are effectively newly dry makes an uproar than mapping EESM.Namely the assembly average that sub-carrier is corresponding is descending to sort, and chooses subcarrier corresponding to minimum value i.e. the poorest subcarrier and reduces master control carrier wave as waiting.
Step 206, pico eNB are by X2 interface to macro eNB feedback adjusting master control carrier wave, and macroeNB upgrades available master control carrier list.
Pico eNB by the X2 interface between macro eNB, 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, adjustment needs the regular hour, therefore needs to be adjusted the completing such as regular hour, after wait, macro eNB upgrades available master control carrier list.
Step 207, macro eNB are according to the master control carrier wave of available master control carrier list adjustment self.
Macro eNB feeds back according to pico eNB and determines self available master control carrier wave.And judge whether master control carrier wave transships, to adjust the master control carrier wave of self.
Wherein, judge that the process whether master control carrier wave transships is identical with step 202.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method for interference coordination in heterogeneous network, it is characterized in that, the method comprises:
The reference signal receiving intensity RSRP that micro-base station Pico eNB feeds back based on user UE determines high interference user, determines to treat scheduling high interference user in high interference user;
According to treating that scheduling high interference user judges that existing master control carrier wave PCC transships, select optimum subcarrier as newly-increased PCC;
Pico eNB upgrades available PCC list by the X2 interface between macro base station Macro eNB to Macro eNB feedback adjusting PCC, Macro eNB;
Describedly determine that high interference user comprises: described high interference user is greater than the first default threshold value from the RSRP of macro eNB and described high interference user from the difference of the RSRP of pico eNB.
2. the method for interference coordination in heterogeneous network according to claim 1, it is characterized in that, described basis waits that dispatching high interference user judges that existing master control carrier wave overload comprises: treat that scheduling high interference number of users is greater than the bearing capacity of the physical downlink control channel PDCCH of existing master control carrier wave.
3. the method for interference coordination in heterogeneous network according to claim 1, it is characterized in that, described basis treats that scheduling high interference user judges that existing master control carrier wave overload comprises: treat that scheduling high interference user uses the control channel Elements C CE percentage of the PDCCH of existing master control carrier wave to be greater than the second default threshold value.
4. the method for interference coordination in heterogeneous network according to claim 1, it is characterized in that, described optimum subcarrier is in the maximum subcarrier of the high interference user of more excellent channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: the maximum subcarrier of the high interference number of users selecting to be in more excellent channel status according to the channel status of high interference user is as newly-increased PCC.
5. the method for interference coordination in heterogeneous network according to claim 1, it is characterized in that, described optimum subcarrier is the maximum subcarrier of the assembly average of channel status, and the optimum subcarrier of described selection comprises as newly-increased PCC: according to the maximum subcarrier of the assembly average of the assembly average selective channel state of the channel status of high interference user as newly-increased PCC.
6. the method for interference coordination in heterogeneous network according to claim 5, it is characterized in that, described assembly average comprises: linear average or the effective Signal to Interference plus Noise Ratio of index map EESM.
7. the method for interference coordination in heterogeneous network according to claim 4 or 5, is characterized in that, the channel status of described high interference user is determined by the RSRP of high interference user feedback and Reference Signal Received Quality RSRQ.
8. the method for interference coordination in heterogeneous network according to claim 4 or 5, it is characterized in that, the channel status of described high interference user is determined by the channel quality indicator (CQI) of network broadband.
9. the method for interference coordination in heterogeneous network according to claim 4 or 5, is characterized in that, by RSRP and RSRQ of high interference user feedback as rough estimate evaluation; By the CQI of network broadband as thin estimated value; The channel status of described high interference user is determined according to described rough estimate evaluation and described thin estimated value.
10. the method for interference coordination in heterogeneous network according to claim 1, it is characterized in that, until scheduling high interference user, described basis judges that existing master control carrier wave PCC comprises after transshipping further: according to treating that scheduling high interference user judges existing master control carrier wave underloading, select the poorest subcarrier to reduce PCC as waiting.
11. methods of interference coordination in heterogeneous network according to claim 1, it is characterized in that, described MacroeNB comprises after upgrading available PCC list further: Macro eNB is according to the PCC of available PCC list adjustment self.
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| CN101925069A (en) * | 2009-06-15 | 2010-12-22 | 株式会社Ntt都科摩 | Interference suppression method and device in wireless cellular network |
| CN102026379A (en) * | 2009-09-18 | 2011-04-20 | 株式会社Ntt都科摩 | Home node base station and method for choosing carrier-wave thereof |
| CN102036295A (en) * | 2010-12-02 | 2011-04-27 | 大唐移动通信设备有限公司 | Method, system and equipment for determining uplink and downlink configuration |
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| CN101662775A (en) * | 2008-08-27 | 2010-03-03 | 上海华为技术有限公司 | Method, device and system for reducing base station interference |
| CN101686586A (en) * | 2009-01-20 | 2010-03-31 | 深圳市众明半导体照明有限公司 | LED dimming device applied to controllable silicon dimmer |
| CN101925069A (en) * | 2009-06-15 | 2010-12-22 | 株式会社Ntt都科摩 | Interference suppression method and device in wireless cellular network |
| CN102026379A (en) * | 2009-09-18 | 2011-04-20 | 株式会社Ntt都科摩 | Home node base station and method for choosing carrier-wave thereof |
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