CN103686835A - Method for regulating transmitting power of almost blank subframe in heterogeneous network - Google Patents
Method for regulating transmitting power of almost blank subframe in heterogeneous network Download PDFInfo
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- CN103686835A CN103686835A CN201210332945.4A CN201210332945A CN103686835A CN 103686835 A CN103686835 A CN 103686835A CN 201210332945 A CN201210332945 A CN 201210332945A CN 103686835 A CN103686835 A CN 103686835A
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Abstract
The invention discloses a method for regulating transmitting power of an almost blank subframe (ABS) in a heterogeneous network. The method comprises the following steps: A, user equipment in a micro cell expansion area measures a downlink signal of a Pico eNB, and reports a measured value to the Pico eNB; B, the Pico eNB acquires interference status information of the expansion area according to the measured value reported by the user equipment, and reports the interference status information in the expansion area to a Macro eNB through an X2 interface; C, the Macro eNB regulates the transmitting power of the ABS according to the interference status information, which is reported by the Pico eNB, in the expansion area, wherein if interference in the micro cell expansion area is smaller than a preset range, the Macro eNB increases the transmitting power of the ABS, and if the interference in the micro cell expansion area is larger than the preset range, the Macro eNB decreases the transmitting power of the ABS. According to the technical scheme, the utilization ratio of ABS resources can be maximized on the premise of ensuring acceptability of the interference.
Description
Technical field
The application relates to mobile communication technology field, and particularly heterogeneous network relates in particular to the transmission power adjustment method of nearly blank subframe (ABS) in a kind of heterogeneous network.
Background technology
In LTE-Advanced network, in order to provide focus to cover and to expand cell coverage area, introduced the network configuration of heterogeneous network.Heterogeneous network refers to disposes low power nodes in macro base station (Macro eNB) overlay area, thereby forms the heterogeneous network system that comprises different node types.Low power nodes can comprise micro-base station (Pico eNB), wherein one or more of Home eNodeB (Home eNB) and relay base station (Relay eNB).
A kind of typical scene of heterogeneous network as shown in Figure 1.Between macro base station (Macro eNB) and micro-base station (Pico eNB), by optical fiber, be connected, form high speed interface, in LTE-Advanced system, be called X2 interface, can transmit the information between base station.
Under this scene, in order to allow Microcell more share the load of macrocell, extension of covering (RE can be used in micro-base station, Range Expansion) technology, when UE is switched to Microcell from macrocell, macrocell when carrying out switch decision, be the measurement result for Microcell that UE reports add one extra on the occasion of, thereby make that UE is easier to be switched in Microcell, but be now positioned at the strong jamming that can be subject to macro base station on the UE down direction of extended region of Microcell.
In order to solve this interference problem, in LTE, introduced the way of nearly blank subframe (ABS, Almost Blank Subframe).Specifically, when the UE that is positioned at Microcell extended region is when receiving the descending sub frame of micro-base station, macro base station will send the business datum of the UE of access macrocell on ABS with low-power.But concrete transmitting power or an open question of how to confirm in prior art, if ABS transmitting power is too high, can cause interference to Microcell extended region; If ABS transmitting power is too low, can cause again macro base station cannot make full use of ABS resource.
Summary of the invention
The application provides the transmission power adjustment method of ABS in a kind of heterogeneous network, can guarantee to disturb the utilance that maximizes ABS resource under acceptable prerequisite.
The embodiment of the present application provides the transmission power adjustment method of ABS in a kind of heterogeneous network, comprising:
A, the subscriber equipment that is positioned at Microcell extended region are measured the downstream signal of micro-base station, and to micro-base station reporting measurement value;
B, micro-base station obtain the disturbance regime information of extended region according to the measured value of user equipment to report, by X2 interface, to macro base station, report the disturbance regime information in extended region;
Disturbance regime information in the extended region that C, macro base station report according to micro-base station is adjusted ABS transmitting power.
Preferably, described measured value comprises the signal quality RSRQ of Microcell.
Preferably, before steps A, further comprise: macro base station or operation management system OAM are the trigger event that the configuration of micro-base station reports, or micro-base station is determined and reported trigger event voluntarily;
Described in step B, by X2 interface, to macro base station, report the disturbance regime information in extended region to comprise: micro-base station judges whether the measured value of user equipment to report meets trigger condition, if so, by X2 interface, to macro base station, report the disturbance regime information in extended region.
Preferably, described trigger event is one of following:
Preset the scope of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report is super goes beyond the scope, micro-base station reports;
Preset the minimum of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report lower than described minimum, micro-base station reports;
Preset the peak of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report higher than described peak, micro-base station reports.
Preferably, the mean value of the measured value of the first signal of described a plurality of user equipment to report obtains in the following manner:
Determine the distance between subscriber equipment and macro base station, set the weighted value of this subscriber equipment according to described distance, subscriber equipment is nearer apart from macro base station, and weighted value is larger, otherwise weighted value is less;
According to formula
calculate the mean value of first signal; Wherein, α
ibe the first signal measured value A of i subscriber equipment
iweighted value, n is the sum of subscriber equipment that reports the measured value of first signal.
Preferably, the measured value of user equipment to report comprises Reference Signal Received Power RSRP and/or the RSRQ of macrocell, and the distance between described subscriber equipment and macro base station decides according to the RSRP of the macrocell of user equipment to report and/or RSRQ; Or the distance between subscriber equipment and macro base station is determined the positioning result of subscriber equipment by micro-base station.
Preferably, described first signal is the signal quality in the extended region of Microcell.
Preferably, before step B, further comprise:
Macro base station sends disturbance regime by X2 interface message to micro-base station and reports request, asks micro-base station to report the disturbance regime in extended region.
Preferably, described disturbance regime information one of is following content:
Minimum and/or peak in the Microcell RSRQ measured value of a plurality of user equipment to report that micro-base station obtains;
The mean value of the Microcell RSRQ measured value that calculate micro-base station;
Need the ABS transmitting power that increases or reduce.
As can be seen from the above technical solutions, micro-base station reports the disturbance regime within the scope of extended region by X2 interface to macro base station, macro base station can be adjusted according to the disturbance regime within the scope of the extended region of micro-base station the transmitting power of ABS, if the interference in the extended region of Microcell is less than preset range, macro base station increases the transmitting power of ABS; On the contrary, if the interference in the extended region of Microcell is greater than preset range, macro base station reduces the transmitting power of ABS, thereby is guaranteeing to disturb the utilance that maximizes ABS resource under acceptable prerequisite.
Accompanying drawing explanation
Fig. 1 is a kind of typical scene schematic diagram of heterogeneous network;
Fig. 2 is the ABS transmission power adjustment method flow chart of the embodiment of the present application one;
Fig. 3 is the ABS transmission power adjustment method flow chart of the embodiment of the present application two.
Embodiment
The original intention of introducing ABS is exactly the interference problem solving within the scope of the extended region of micro-base station, therefore macro base station can be adjusted according to the disturbance regime within the scope of the extended region of micro-base station the transmitting power of ABS, thereby is guaranteeing to disturb the utilance that maximizes ABS resource under acceptable prerequisite.The application has proposed a kind of dynamic or semi-static ABS transmission power adjustment method.If the interference in the extended region of Microcell is less than preset range, macro base station increases the transmitting power of ABS; On the contrary, if the interference in the extended region of Microcell is greater than preset range, macro base station reduces the transmitting power of ABS.
For making know-why, feature and the technique effect of present techniques scheme clearer, below in conjunction with specific embodiment, present techniques scheme is described in detail.
Embodiment mono-: micro-base station reports the disturbance regime in extended region to macro base station when meeting trigger event, and macro base station is adjusted ABS transmitting power afterwards.
In this embodiment, the trigger event that macro base station or operation management system (OAM) can report for the configuration of micro-base station in advance, certainly, micro-base station itself also can be determined trigger event voluntarily; Once this trigger event is satisfied, micro-base station reports the disturbance regime information in extended region to macro base station; Macro base station is adjusted the transmitting power of ABS according to the disturbance regime information reporting.The ABS transmission power adjustment method flow process of embodiment mono-as shown in Figure 2, comprises the steps:
Step 201: macro base station or OAM are the trigger event that the configuration of micro-base station reports, or micro-base station is determined this trigger event voluntarily.
Trigger event can include but not limited to following several:
Preset the scope of a signal, if surpass the measured value of this signal of user equipment to report of predetermined number or the mean value of the measured value of this signal of a plurality of user equipment to report is super goes beyond the scope, micro-base station reports;
Preset the minimum of a signal, if be worth lower than this over the measured value of this signal of user equipment to report of predetermined number or the mean value of the measured value of this signal of a plurality of user equipment to report, micro-base station reports;
Preset the peak of a signal, if be worth higher than this over the measured value of this signal of user equipment to report of predetermined number or the mean value of the measured value of this signal of a plurality of user equipment to report, micro-base station reports;
" signal " in trigger event can be the signal quality (RSRQ, Reference Signal Receive Quality) in the extended region of Microcell.Described predetermined number can be 1, can be also one and be greater than 1 finite value.
Step 202: the UE measurement that is positioned at Microcell extended region scope reports.
In existing system, in the extended region of Microcell, the measurement of UE is restricted, and now UE only can measure on ABS, and therefore micro-base station can obtain the measurement result of UE to ABS.In the present embodiment, the signal quality (RSRQ) that can comprise Microcell in the measurement report of UE, Reference Signal Received Power (the Reference.Signal Received Power that configuration indication UE comprises macrocell in measurement report can be measured by change in micro-base station simultaneously, or report both RSRP) or signal quality RSRQ, simultaneously.
Step 203: micro-base station judges that whether the measurement result that UE reports meets trigger condition, if so, reports the disturbance regime information in extended region by X2 interface to macro base station.
Measurement by UE reports, and micro-base station can obtain the measured value of a plurality of UE to Microcell RSRQ in extended region, and now, micro-base station can adopt following two kinds of methods to judge whether trigger event is satisfied:
Method one: the measured value that micro-base station directly reports according to UE judges whether to meet trigger event.For example, if configured first trigger event in step 201, if so now micro-base station finds that there is and reaches RSRQ measured value that the UE of predetermined number reports not in configured scope, micro-base station thinks that trigger event is satisfied;
Method two: the measured value that micro-base station reports UE is averaging, judges whether to meet trigger event according to average measurement value afterwards.For example, if configured first trigger event in step 201, if so now the average measurement value of micro-base station discovery Microcell RSRQ is not in configured scope, micro-base station thinks that trigger event is satisfied.
For the method being averaging, micro-base station can adopt the method for linear averaging, also can adopt average weighted method.Suppose that micro-base station obtains n the measurement result that UE reports: A
1, A
2..., A
nif carry out linear averaging, the measured value after average
for:
For the UE of diverse location in extended region, the interference signal of macro base station shared proportion in its suffered total interference is different.For the UE closer apart from macro base station, as the UE A in Fig. 1, the interference ratio that is subject to macro base station is larger, and the interference that is subject to other base stations is around smaller, that is to say in the suffered whole interference of UE now, larger from the interference proportion of macro base station; And the UE distant apart from macro base station, as the UE B in Fig. 1, the interference proportion from macro base station in suffered whole interference is smaller.For the interference of evaluate macro base station to UE in extended region, can give different weighted values according to its measurement result that is not all of UE position, UE is nearer apart from macro base station, and the weighted value of its measurement result is larger, on the contrary weighted value is less.Distance between UE and macro base station can decide according to the RSRP of the macrocell comprising in the measurement report of UE or RSRQ, and RSRP or RSRQ are larger, and UE is nearer apart from macro base station, and anti regular is far away; Distance between UE and macro base station also can be decided the positioning result of UE by micro-base station.Average weighted measured value
computational methods be:
α wherein
imeasurement result A for UE i
iweighted value, RSRP or the RSRQ of the macrocell being comprised in measurement report by UE i decide, and also can to the positioning result of UE i, be determined by micro-base station.
The particular content of the disturbance regime information that micro-base station reports can be one of following content:
The measured value of UE to Microcell RSRQ, as the minimum in the Microcell RSRQ measured value of a plurality of UE that micro-base station obtained, or peak, or report minimum and peak simultaneously;
The average measurement value of the Microcell RSRQ that calculate micro-base station;
The measurement result reporting according to UE, micro-base station can determine whether macro base station needs to increase or reduce the transmitting power of ABS, the ABS transmitting power that micro-base station directly increases needs or reduce afterwards reports macro base station.For example, suppose that trigger event is based on average Microcell RSRQ scope, if micro-base station finds that average measurement value is less than the range of signal setting in advance, show to disturb in extended region very large, micro-base station thinks that macro base station should reduce the transmitting power of ABS, otherwise should increase the transmitting power of ABS.The information that micro-base station reports can be 1 bit, and indication macro base station increases the transmitting power of ABS or reduce a step-length; Also can be a plurality of bits, indication increases or reduces a plurality of step-lengths by ABS transmitting power, and now system need to define the step value that power is adjusted.Or, micro-base station concrete magnitude of power that also directly indicated horsepower increases or reduces.
Step 204: the disturbance regime information in the extended region that macro base station reports according to micro-base station is adjusted ABS transmitting power.
If what micro-base station reported is measured value or average measurement value, according to described measured value or average measurement value, determines the ABS transmitting power that should increase or reduce and adjust; If what micro-base station reported is transmitting power or the step-length that increases or reduce, directly according to reporting content adjustment.
Embodiment bis-: micro-base station reports the disturbance regime in extended region under the requirement of macro base station, and macro base station is adjusted ABS transmitting power afterwards.
In this scheme, do not need for micro-base station configure trigger event, micro-base station only just can report the disturbance regime in extended region under the requirement of macro base station.
Step 301: the UE measurement in the extended region of Microcell reports, the measurement result that micro-base station stored UE reports.
This step is identical with the step 202 in embodiment mono-, it should be noted that the measurement result that now Microcell can't report a plurality of UE processes.
Step 302: macro base station sends disturbance regime by X2 interface message to micro-base station and reports request, asks micro-base station to report the disturbance regime in extended region.
Step 303: micro-base station reports the disturbance regime in extended region.
Micro-base station is concrete reports the explanation of content in can reference example one step 203.According to the different contents that reports, micro-base station may need the measurement result of UE to process, if for example micro-base station need to report average measurement value, micro-base station need to be averaging operation to the measurement result of UE.
Step 304: the disturbance regime information in the extended region that macro base station reports according to micro-base station is adjusted ABS transmitting power.
This step is with the step 204 in embodiment mono-.
The foregoing is only the application's preferred embodiment; not in order to limit the application's protection range; all within the spirit and principle of present techniques scheme, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.
Claims (9)
1. a transmission power adjustment method of nearly blank subframe ABS in heterogeneous network, is characterized in that, comprising:
A, the subscriber equipment that is positioned at Microcell extended region are measured the downstream signal of micro-base station, and to micro-base station reporting measurement value;
B, micro-base station obtain the disturbance regime information of extended region according to the measured value of user equipment to report, by X2 interface, to macro base station, report the disturbance regime information in extended region;
Disturbance regime information in the extended region that C, macro base station report according to micro-base station is adjusted ABS transmitting power, if the interference in the extended region of Microcell is less than preset range, macro base station increases the transmitting power of ABS; If the interference in the extended region of Microcell is greater than preset range, macro base station reduces the transmitting power of ABS.
2. method according to claim 1, is characterized in that, described measured value comprises the signal quality RSRQ of Microcell.
3. method according to claim 2, is characterized in that, before steps A, further comprises: macro base station or operation management system OAM are the trigger event that the configuration of micro-base station reports, or micro-base station is determined and reported trigger event voluntarily;
Described in step B, by X2 interface, to macro base station, report the disturbance regime information in extended region to comprise: micro-base station judges whether the measured value of user equipment to report meets trigger condition, if so, by X2 interface, to macro base station, report the disturbance regime information in extended region.
4. method according to claim 3, is characterized in that, described trigger event is one of following:
Preset the scope of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report is super goes beyond the scope, micro-base station reports;
Preset the minimum of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report lower than described minimum, micro-base station reports;
Preset the peak of first signal, if surpass the measured value of first signal of user equipment to report of predetermined number or the mean value of the measured value of the first signal of a plurality of user equipment to report higher than described peak, micro-base station reports.
5. method according to claim 4, is characterized in that, the mean value of the measured value of the first signal of described a plurality of user equipment to report obtains in the following manner:
Determine the distance between subscriber equipment and macro base station, set the weighted value of this subscriber equipment according to described distance, subscriber equipment is nearer apart from macro base station, and weighted value is larger, otherwise weighted value is less;
According to formula
calculate the mean value of first signal; Wherein, α
ibe the first signal measured value A of i subscriber equipment
iweighted value, n is the sum of subscriber equipment that reports the measured value of first signal.
6. method according to claim 5, it is characterized in that, the measured value of user equipment to report comprises Reference Signal Received Power RSRP and/or the RSRQ of macrocell, and the distance between described subscriber equipment and macro base station decides according to the RSRP of the macrocell of user equipment to report and/or RSRQ; Or the distance between subscriber equipment and macro base station is determined the positioning result of subscriber equipment by micro-base station.
7. method according to claim 4, is characterized in that, described first signal is the signal quality in the extended region of Microcell.
8. method according to claim 2, is characterized in that, before step B, further comprises:
Macro base station sends disturbance regime by X2 interface message to micro-base station and reports request, asks micro-base station to report the disturbance regime in extended region.
9. according to the method described in claim 2 to 8 any one, it is characterized in that, one of described disturbance regime information is following content:
Minimum and/or peak in the Microcell RSRQ measured value of a plurality of user equipment to report that micro-base station obtains;
The mean value of the Microcell RSRQ measured value that calculate micro-base station;
Need the ABS transmitting power that increases or reduce.
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| US20160353451A1 (en) * | 2014-01-28 | 2016-12-01 | Samsung Electronics Co., Ltd. | Interference control method and apparatus therefor in a heterogeneous system |
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