CN104469918B - A kind of adaptive femtocell power control method - Google Patents
A kind of adaptive femtocell power control method Download PDFInfo
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- CN104469918B CN104469918B CN201410714489.9A CN201410714489A CN104469918B CN 104469918 B CN104469918 B CN 104469918B CN 201410714489 A CN201410714489 A CN 201410714489A CN 104469918 B CN104469918 B CN 104469918B
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- home enodeb
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
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Abstract
The invention discloses a kind of adaptive femtocell power control methods, comprise the following steps：1st, for deploying the heterogeneous network of Home eNodeB recently, power configuration is first carried out to Home eNodeB using original or user-defined power control algorithm, such as traffic conditions of the coverage for Home eNodeB and accessing user set a suitable transmission power；2nd, the adaptive power adjustment algorithm of automatic start after working stage is entered, the algorithm introduces the parameter that can reflect the other Home eNodeB annoyance levels of same layer, Home eNodeB near find increase to a certain degree when then reduce the transmission power of Home eNodeB, to offset the increase of the interference caused by the new Home eNodeB disposed or newly started；Otherwise when whole interference level reduces, then the transmission power of its own is increased as needed.There is the transmission power that can be adaptively adjusted Home eNodeB, effectively protect the unauthorized macrocell user in Home eNodeB coverage.
Description
Technical field
The present invention relates to a kind of wireless communication technique, more particularly to a kind of adaptive femtocell power control method.
Background technology
With the development of mobile communication technology, proportion of the data service in cellular network flow is increasing.And honeycomb
Most flow is all happened under indoor environment in net, therefore being introduced into for Home eNodeB effectively can unload current-carrying from grand net
Amount, and preferably support the business demand of big data quantity.
Due to Home eNodeB can by user from buying self-configuring, and often with macro base station using identical frequency with
Improve channeling degree.Therefore Home eNodeB is it is possible that can be to unauthorized macrocell user and other Home eNodeB
There are serious downlinks to disturb by user, therefore needs to introduce the means of Inter-Cell Interference Coordination, implements Power Control to Home eNodeB
It is one of which.It is suggested at present there are many method of Power Control, but they are mostly both for single family
Base station or fixed network scenarios and design.And the situation of reality is that Home eNodeB is often random placement, and same
Once region either can dispose the deployment scenario of substantial amounts of Home eNodeB Home eNodeB in place or network size becomes
Change, the performance of these schemes or algorithm will decline, and some need readjusts parameter, and some even again can not be normal
Work.
The content of the invention
The shortcomings that it is an object of the invention to overcome the prior art and deficiency, provide a kind of adaptive Home eNodeB power
Control method, the femtocell power control method introduce an interference factor with layer Home eNodeB, reflect one family
What base station was subject to comes from the annoyance level of neighbouring other Home eNodeB.
The purpose of the present invention is achieved through the following technical solutions：A kind of adaptive femtocell power control method, bag
Include following steps：
Step 1, the heterogeneous network for deploying Home eNodeB recently, first using original or user-defined power
Control algolithm carries out Home eNodeB power configuration, and such as traffic conditions of the coverage for Home eNodeB and accessing user are set
A fixed suitable transmission power；
Step 2, the adaptive power adjustment algorithm of automatic start after working stage is entered, which introduces one can
Reflect the parameter (" with layer Home eNodeB interference factor ") with the other Home eNodeB annoyance levels of layer, family's base near discovery
Station increase to a certain degree when, then the transmission power of Home eNodeB is reduced, to offset the new Home eNodeB institute for disposing or newly starting
The increase of caused interference；Otherwise when whole interference level reduces, then the transmission power of its own is increased as needed,
With the system performance obtained.
The same layer man added in user-defined Home eNodeB power control scheme and adaptive step in step 1
Front yard base station interference factor is independent；User can voluntarily select initial power control scheme, can also be with reference to following work(
Rate control program：
P1=α PM+ β,
P2=PM+Poffset,
P3=α PSINR+ β,
Wherein Pk, k ∈ { 1,2,3 } are the initialization powers of optional different control programs, and α and β is the parameter of adjustment, α
The slope of power control profile is adjusted, β controls the dynamic range of power control profile；PMIt represents measured by Home eNodeB most
By force with the power of frequency macrocell；Poffset=median (Ppathloss,Poffset_max,Poffset_min), wherein PpathlossRepresent nearest
Macrocell user to the indoor path loss and penetration loss between Home eNodeB；PSINRRepresent nearest from target household base station
That macrocell user SINR (for the interference of target household base station).
With layer Home eNodeB interference factor, this variable is that electromagnetic interference environment measures to around in family's base station side
It calculates and is converted to afterwards.
Home eNodeB is by measuring the shared channel Reference Signal Received Power RSRP of its neighboring home base station, and after being added
To judge the disturbed condition of surrounding.
After measurement obtains RSRP and/or other characteristics of signals of the shared channel of neighboring home base station, key is to pass through this
A little measuring signals determine the value of interference factor, do not limit the mode that Home eNodeB interference factor is specifically calculated.
The Poewr control method of the present invention can set a power threshold, only when RSRP measured values or other measurement parameters
The sum of, i.e. total interference with layer Home eNodeB during more than the threshold value, just inspires adaptive step and carries out power back-off.
Its shared channel RSRP perceived is independently measured by each Home eNodeB, can independently calculate respective same layer man
Front yard base station interference factor simultaneously implements Power Control, and irrelevant information interacts between each Home eNodeB at this time；Other can also be passed through
Channel obtain the measuring signals of other Home eNodeB, the same layer Home eNodeB interference factor more optimized by information exchange
Value.
By setting the maximum transmission power and minimum emissive power of Home eNodeB, and to add in and be done with layer Home eNodeB
It disturbs the Home eNodeB power obtained after the factor and is not greater than its maximum transmission power or less than its minimum emissive power.
The operation principle of the present invention：The present invention measures neighbouring family by the Home eNodeB that will implement Power Control first
The power of base station is added the reception power of all neighbouring Home eNodeB to obtain total jamming power of the Home eNodeB of same layer, so
Converted thereof into afterwards by certain mapping relations or functional relation can characterize the interference of same layer Home eNodeB annoyance level because
Son.A specific power control algorithm is finally selected, and this interference factor is added thereto, being formed has in not consanguinity
The Poewr control method that can be adaptively adjusted under front yard base station deployment density and network size.
The present invention is had the following advantages compared with the prior art and effect：
1st, femtocell power control method of the invention is solved due to Home eNodeB deployment density or network size
Variation, the disturbed condition of same layer Home eNodeB can be caused to change, and most Poewr control method only considers its own
Interference.Although reducing interference of the single Home eNodeB for some macrocell user, with multiple neighbouring family bases of layer
The problem of superposition to it of standing interference is still larger, coming from of can accurately reflecting that one family base station is subject to are neighbouring other
The annoyance level of Home eNodeB.
2nd, femtocell power control method of the invention automatically updates the transmission power of each Home eNodeB.It is adjusting every time
Whole period, according to the general power of the region Home eNodeB in heterogeneous network, judge each Home eNodeB whether the needs extraly
Reduce transmission power.When the deployment density of Home eNodeB in network and switch conditions change, network rings can be flexibly adapted to
Border is adaptively adjusted the transmission power of Home eNodeB, effectively protects the unauthorized macrocell in Home eNodeB coverage
User.
Description of the drawings
Fig. 1 is the network scenarios figure that the present invention is directed to.From the figure：As the Home eNodeB disposed in the same area increases
It is more, the interference of unauthorized macrocell user can be increased, thus need with the adaptive power control algorithm of network size.
Specific embodiment
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, according to agreement, Home eNodeB can measure the Reference Signal Received Power (Co- of shared channel
channel RSRP)Pi, the reference as other Home eNodeB interference that neighbouring femtocell user is subject to.By all measurements
To this power statistic get up, can obtain overall same layer Home eNodeB interference namely：It calculates
PtotalWhen unit be mW.
Based on this measured value, the expression-form of interference factor can be designed, it is of the invention not to be constrained in its specific table
Up to form, both can directly quote, it can also subsection compression.Add factor is can not only be used for, can also be used as and multiply sex factor.This hair
Bright embodiment provides a kind of additivity directly quoted with layer interference factor to be illustrated to the method proposed, computational methods
For：
PH=max (Ptotal-Pthreshold, 0),
Here power unit is dB, this is in order to which the algorithm with Power Control is consistent, and is easily combined.For below
The bright reasonability so set.First, PtotalIt can reflect the disturbed condition from other Home eNodeB in scene.And it sets
PthresholdMeaning be, only when the Home eNodeB interference of same layer is big to a certain extent, can just produce the performance of original algorithm
Raw apparent influence, it is believed that just it is necessary to introduce this interference factors.And finally ensure PHIt is because its generation not less than 0
Table be same layer the interference that brings of other Home eNodeB, it will not make total interference become smaller instead.
Then this interference factor can be added in different power control algorithms according to actual conditions, unrestricted choice,
To form the Poewr control method that the present invention is constructed.Specifically, following power control algorithm may be employed：(note：P1、P2With
P3What is referred to is all the transmission power of target household base station).
P1=α PM+ β, wherein PMRepresent measured by Home eNodeB most by force with the power of frequency macrocell, α is linear mark
Amount, for changing the slope of Power Control mapping curve.β is then used for changing the dynamic range of Power Control, its unit is dB.
P2=PM+Poffset,
PMDefinition with it is consistent above.And Poffset=median (Ppathloss,Poffset_max,Poffset_min), wherein
PpathlossRepresent nearest macrocell user to the indoor path loss and penetration loss between Home eNodeB.Poffset_maxWith
Poffset_minIt is respectively intended to constraint PoffsetMaximum and minimum value.
P3=α PSINR+ β, wherein PSINRRepresent that the macro base station of nearest macrocell user receives power with respect to the Home eNodeB
The definition of the SINR of jamming power, α with it is consistent above.
After then adding in the interference factor of same layer Home eNodeB of inventive embodiments, last obtained Poewr control method phase
Ground is answered to become：
Ptx1=median (P1-PH,Pmax,Pmin),
Ptx2=median (P2-PH,Pmax,Pmin),
Ptx3=median (P3-PH,Pmax,Pmin),
Wherein, PmaxWith PminThe maximum and minimum power that expression Home eNodeB can configure respectively.Selection is such to be combined
Form is because PHWhat is represented is the interference of same other Home eNodeB of layer, and original algorithm only takes into account the Home eNodeB sheet
The interference of body, it is therefore desirable on the basis of the transmission power of the Home eNodeB obtained in original algorithm, then subtract this interference
Value, can just balance out the interference that other Home eNodeB are brought so that the interference of this layer of all Home eNodeB is effectively suppressed.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. a kind of adaptive femtocell power control method, which is characterized in that comprise the following steps：
Step 1, the heterogeneous network for deploying Home eNodeB recently, first using original or user-defined Power Control
Scheme carries out Home eNodeB power configuration, and the traffic conditions of coverage and accessing user for Home eNodeB set one
Suitable transmission power；
Step 2, the adaptive power adjustment algorithm of automatic start after working stage is entered, which, which introduces one, to reflect
With the parameter of the other Home eNodeB annoyance levels of layer, i.e., with layer Home eNodeB interference factor, connecing for all neighbouring Home eNodeB
It receives power to be added to obtain total jamming power of the Home eNodeB of same layer, be then converted by mapping relations or functional relation
Into the interference factor that can characterize same layer Home eNodeB annoyance level；Home eNodeB near finding increases to a certain degree
When, then the transmission power of Home eNodeB is reduced, to offset the increase of the interference caused by the new Home eNodeB disposed or newly started；
Otherwise when whole interference level reduces, then the transmission power of its own is increased as needed.
2. adaptive femtocell power control method as described in claim 1, which is characterized in that the user in step 1
Customized Home eNodeB power control scheme is independent with the same layer Home eNodeB interference factor added in adaptive step
's；User is used with reference to following power control scheme：
P1=α PM+ β,
P2=PM+Poffset,
P3=α PSINR+ β,
Wherein Pk, k ∈ { 1,2,3 } are the initialization powers of optionally different control programs, and α and β is the parameter of adjustment, and α adjusts work(
The slope of rate controlling curve, β control the dynamic range of power control profile；PMRepresent most strong with frequency measured by Home eNodeB
The power of macrocell；
Poffset=median (Ppathloss,Poffset_max,Poffset_min),
In PMOn the basis of, increase PoffsetTo get to the actual emission power P of Home eNodeB2；Poffset_max,Poffset_minRespectively
For constraining PoffsetMaxima and minima, PoffsetPhysical significance be PpathlossBy Poffset_max,Poffset_min's
Value after constraint；Wherein, PpathlossNearest macrocell user is represented to the indoor path loss between Home eNodeB and is worn
Loss thoroughly；PSINRRepresent the SINR of that macrocell user nearest from target household base station.
3. adaptive femtocell power control method as described in claim 1, which is characterized in that done with layer Home eNodeB
It calculates and is converted to after disturbing this variable of the factor electromagnetic interference environment measuring to around in family's base station side.
4. adaptive femtocell power control method as claimed in claim 3, which is characterized in that Home eNodeB passes through survey
The shared channel Reference Signal Received Power RSRP of its neighboring home base station is measured, and is added the disturbed condition around judging later.
5. the method as described in claim 3 or 4, which is characterized in that measurement obtains the shared channel of neighboring home base station
For RSRP always and/or after other characteristics of signals, key is the value that interference factor is determined by these measuring signals.
6. adaptive femtocell power control method as described in claim 1 or 4, which is characterized in that one can be set
Power threshold, only when the sum of RSRP measured values or other measurement parameters, i.e. total interference with layer Home eNodeB is more than the threshold value
When, it just inspires adaptive step and carries out power back-off.
7. adaptive femtocell power control method as described in claim 1, which is characterized in that by each Home eNodeB
Its shared channel RSRP perceived is independently measured, can independently calculate respective same layer Home eNodeB interference factor and implements work(
Rate controls, and irrelevant information interacts between each Home eNodeB at this time；Other Home eNodeB can also be obtained by other channels
Measuring signal, the same layer Home eNodeB interference factor value more optimized by information exchange.
8. adaptive femtocell power control method as described in claim 1, which is characterized in that by setting family's base
The maximum transmission power and minimum emissive power stood, and to add in the Home eNodeB obtained after layer Home eNodeB interference factor
Power is not greater than its maximum transmission power and cannot be less than its minimum emissive power.
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| CN105263183B (en) * | 2015-11-02 | 2018-09-21 | 中国联合网络通信集团有限公司 | A kind of method and device of power adjustment |
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| CN103338505A (en) * | 2013-07-18 | 2013-10-02 | 西安电子科技大学 | Union power coordination method for sensing interference in laminated cellular network |
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