CN105554862B - A kind of enhanced uplink fractional rating control method for Microcell in heterogeneous network - Google Patents
A kind of enhanced uplink fractional rating control method for Microcell in heterogeneous network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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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
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
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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
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- 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 present invention relates to a kind of enhanced uplink fractional rating control methods for Microcell in heterogeneous network, the heterogeneous network includes macrocell and multiple Microcells for being deployed in the macrocell, user equipment provides service by macro base station and micro-base station respectively in the macrocell and Microcell, comprising steps of A. sets by the upper dividing value of the power reference value of Microcell m any one user equipment serviced the uplink channel interference situation of macrocell according to the admissible amount of uplink interference grade of macro base station and MicrocellB. defining one can inhibit uplink cross-layer interference of the Microcell to macrocell, enhanced power a reference value:C. traditionally in row fractional rating control method, using enhanced power a reference valueTo more effectively control the transmission power of the user equipment.Compared with prior art, the present invention can effectively reduce Microcell to the uplink channel interference of macrocell, to enhance the communication quality of heterogeneous network in lte-a system.
Description
Technical Field
The invention relates to a micro-cell uplink power control method, in particular to an enhanced uplink fractional power control method for a micro-cell in a heterogeneous network.
Background
In order to increase the capacity and/or coverage of a conventional cellular mobile communication network only deploying macro cells (i.e., marcocells), in an LTE-Advanced (abbreviated LTE-a) system, it is considered that some low-power micro cells (i.e., small cells), such as Pico cells, may be deployed in a co-channel manner within the coverage of a macro cell; the resulting network is often referred to as a heterogeneous network (HetNets).
When a plurality of micro cells which can be opened to access all network users are deployed in the macro cell, some user equipment can be served by the micro cells, so that the load of the macro cell is reduced, and the load balance is realized.
In the LTE-a system, a corresponding base station (eNB) transmits reference symbols regardless of a macro cell or a micro cell, and the reference symbols transmitted by the respective base stations are orthogonal to each other. Each user equipment measures the power of reference symbols received from its surrounding base stations, including its serving base station. In addition, any ue reports the measured Reference Symbol Received Powers (RSRPs) to its serving base station.
For any user equipment UEjBy usingA set of cell indices representing its surrounding base stations. And, using RSRPijRepresenting a UEjMeasured power of reference symbols received from base station i, then the conventional cell association criterion based on measured reference symbol received power may be expressed as follows:
the above criteria mean that the UEjWill be associated to the base station whose measured power of the reference symbols received from its surrounding base stations is the largest.
In a heterogeneous network with co-channel deployment of macro cells and micro cells, if the cell association criteria as given in (1) are still applied, more user equipments will be allocated than in micro cellsAssociated to the macro cell because the transmit power of the macro cell base station is much larger than that of the micro cell base station. In this case, the available resources of the microcell are not fully utilized, and in the macrocell, competition for the available resources is severe. In order to more effectively utilize the potential load balancing function provided by the micro cell, a scheme is given by '3 GPP, R1-094225, DL performance with hotzone cells, RAN1#58 b', and for a heterogeneous network with macro cells and micro cells deployed, any UE is subjected tojThe following cell association criteria are used:
the above criteria mean that the UEjTo the base station (macrocell base station or microcell base station) whose sum of the measured power of the reference symbols received from its surrounding base stations and the offset value (biasi) of the respective base station is the largest.
In the above equation (2), the offset value is 0 for the macro cell; for each microcell, the offset value is a non-negative value, so that more user equipment can be served by the microcell. Since the use of the offset value is equivalent to giving the micro cell the capability to extend the range associated with the user equipment, this procedure is called coverage extension (or RE) of the micro cell, and the above offset value is also called coverage extension offset value.
In the heterogeneous network, some micro cells are deployed in a co-channel mode in the coverage area of each macro cell, and the coverage area of the macro cell and the coverage area of the micro cells deployed in the macro cell are mutually overlapped. Therefore, in a heterogeneous network, the interference between a macro cell and a micro cell within its coverage is much stronger than the interference between the macro cell and a neighboring macro cell. Specifically, in one aspect, a user equipment (i.e., Pico UE, PUE for short) served by a certain micro cell, which is located near a Macro base station (i.e., Macro eNB, MeNB for short), may interfere with the reception of uplink signals by the Macro base station. On the other hand, user equipment (i.e., Macro UE, abbreviated MUE) served by the Macro cell located near the coverage of the micro cell may interfere with the reception of uplink signals by the corresponding micro base station (i.e., PicoeNB, abbreviated PeNB).
If all the micro cells are opened with the coverage extension (i.e. RE) function, some user equipments originally served by the macro cell in the vicinity of the coverage of the micro cells will be RE-associated to the micro cells, so as to reduce the uplink interference of the user equipments served by the macro cell to the corresponding micro base station. These user equipments (i.e., RE-reserved PUEs) associated with the corresponding micro cells, which are caused by the coverage extension function of the micro cells, may in turn cause significant (even severe) interference to the uplink signal reception of the macro base station.
In fig. 1, a macro cell is taken as an example, and an uplink inter-cell interference situation in a scenario where a macro cell and a micro cell share a channel is shown.
In a conventional macro-cell-only cellular mobile communication network, uplink power control (i.e., power control, abbreviated as PC) has been widely studied as an effective mechanism against uplink inter-cell interference. In the 3GPP LTE/LTE-a system, an open-loop (i.e., open-loop) "Fractional Power Control (FPC) scheme" has been adopted by the 3GPP labeling organization as an uplink power control scheme applied in a macro cell.
In the FPC scheme, for any given ue, the transmit power of the ue on a Physical Resource Block (PRB) in the frequency domain is first calculated, and then the uplink transmit power adopted by the ue changes with the number of PRBs allocated to the ue. According to "3 GPP TS36.213(v9.0.0), Evolved Universal terrestrial radio access (E-UTRA); physica layer procedures "and" a.simonsson and a.UpLink power control in LTE-overview and performance, IEEE VTC Fall 2008, pp.1-5, Sept.2008 ", for any UEiThe specific calculation formula of the FPC scheme is shown as follows:
in the above-mentioned formula (3),is the maximum allowable transmit power of the user equipment, variable MiIndicating the current allocation to the UEiParameter α ∈ [0,1 ]]The value of α is set in a cell-specific manner, i.e., all ues served by the same cell use the same α value, specifically, α takes the range of {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1}, and high-level signaling uses 3-bit information to specify the value of the cellRepresenting a UEiThe resulting path loss on the downlink (i.e., pathloss, PL for short) is measured. It is noted that in all official documents of the 3GPP standardization body, one log-domain variable (in dB) associated with the path loss represents the absolute value of the corresponding path loss (e.g., if the path loss is-10 dB, the value of the corresponding log-domain path loss variable is equal to 10 dB). Parameter(s)Is a power reference value designated by the system, and can reflect the interference and noise level of the receiving end (namely, the base station side) of the uplink.The value of (A) is usually set in a cell-specific manner, i.e. in a cell-specific mannerAll user equipments served by the same cell will use the sameThe value, of course, may alternatively be added to a user equipment specific correction value for each user equipment.
In actual network deployment, parameters α and May2008 can be optimized by The network according to "S.Sesia, I.Toufik, and M.Baker, LTE-The UMTS Long Term Evolution From thermal to practical, Wiley, 2011" and "C.Castel lanos etThe value of (b) is set appropriately.
For a Macro cell and micro cell co-channel deployment scenario, in order to minimize the negative impact on the network caused by deploying micro cells, all Macro cells (i.e., Macro layers) continue to use the FPC scheme as shown in formula (3) that has been commonly applied to Macro cells. For all micro cells newly deployed into the network (i.e., Pico layer), whether using the FPC scheme or another uplink power control scheme, since the coverage of any one Macro cell and those micro cells deployed therein overlap with each other, the uplink power setting of the Pico layer and the uplink power setting of the Macro layer may have a negative impact on each other. Specifically, when a macro cell executes an FPC scheme to perform uplink power setting on MUEs served by the macro cell, one or more micro cells deployed within the coverage area of the macro cell may simultaneously perform an uplink power control scheme to adjust uplink transmission power of some PUEs, so that a wireless communication transmission environment with a broadcast characteristic changes (that is, a wireless channel condition of an uplink corresponding to the macro cell changes); this results in the macro cell becoming ineffective in setting the transmission power for some MUEs according to the previous uplink channel condition, i.e., the dynamic variation of uplink interference generated by the PUEs to the macro cell may make the power settings of the MUEs unable to meet the corresponding Quality of Service (QoS) requirements. Similarly, the dynamic variation of uplink interference generated by MUEs to microcells may also cause the transmit power set by microcells for some PUEs to be effectively ineffective.
Therefore, for a Macro cell and micro cell co-channel deployment scenario, the existing uplink power control scheme needs to be improved and enhanced, because the existing uplink power control scheme does not consider the dynamic change of uplink interference between the Macro layer and the Pico layer, and thus cannot ensure the uplink service quality requirement.
Disclosure of Invention
According to the understanding of the background art and the existing technical problems, aiming at the heterogeneous network with the co-channel deployment of the macro cell and the micro cell, the invention provides an enhanced uplink fractional power control method for the micro cell on the premise that the macro cell uses the uplink fractional power control method which is already commonly applied to the macro cell and is shown in the formula (3), and the method can more effectively inhibit the uplink cross-layer interference to the macro cell generated by the micro cell and can take the dynamic change of the uplink interference to the micro cell from the macro cell into consideration.
The invention provides an enhanced uplink fractional power control method for a micro cell in a heterogeneous network, wherein the heterogeneous network comprises a macro cell and a plurality of micro cells deployed in the macro cell, and user equipment in the macro cell and the micro cells are respectively served by a macro base station and a micro base station, and the method is characterized by comprising the following steps:
A. according to the allowable uplink interference magnitude of the macro base station, the measurement value of the average uplink interference magnitude generated by all the micro cells deployed in the macro cell to the macro cell, and the average uplink interference magnitude of any one micro cell m to the macro cellSetting up uplink interference situation for any one user equipment PUE served by micro cell miUpper limit value of the power reference value
B. Utilizing a power reference value set for any UE in a conventional uplink fractional power control methodAnd obtained in step ADefining an enhanced power reference value for suppressing uplink cross-layer interference of a micro cell to a macro cell:
C. in the traditional uplink fractional power control method, an enhanced power reference value is adoptedAnd sets the value of the partial path loss compensation factor to 1, thereby controlling any one of the user equipment PUEs served by the microcell miTransmit power of
Wherein:for the user equipment PUEiMaximum allowed transmit power of, MiIs at presentDistribution to user equipment PUEiThe number of the physical resource modules of (a),for the user equipment PUEiAnd the micro base station m serving it.
Upper bound value of the power reference valueThe method specifically comprises the following steps:
wherein:the allowable interference level for the macro base station,for a measure of the average uplink interference level generated by all the microcells deployed within a macrocell on that macrocell,for the microcell m at the current uplink interference level to the macrocell before performing a new round of uplink power control,for user equipment PUEiA measure of path loss with the macro base station; t ismIs the number of all user equipments served by the microcell m.
Upper bound value of the power reference valueThe obtaining process specifically comprises the following steps:
A1. the macro base station sends reference information to the micro base station m through a return link, wherein the reference information comprisesAnd
A2. the micro base station m estimates the uplink interference magnitude of the micro cell to the macro cell at present according to the path loss value between each user equipment served by the micro base station m and the macro base station and the uplink transmission power value used by each user equipment served by the micro base station m
A3. The micro base station m is based on the pair after completing a new round of uplink power controlEstimation of the change brought about, and failure to make the changeExceedIn the principle of (a) is,
according to MiAnd TmMeterCalculating any one user equipment PUE served by the micro cell miUpper limit value of the power reference value
Allowable interference magnitude of the macro base stationSpecifically estimated as:
wherein: the user equipment that produces the smallest uplink received signal strength at the macro base station among all the user equipments served by the macro base station is identified as MinRecSS MUE,is the uplink transmit power, PL, of the MUEMeNB-MinRecSS MUEIs a measure of the path loss between the MUE and the macro base station,minimum signal to interference plus noise ratio, P, required for the MUE to achieve successful uplink signal transmissionnoiseAnd estimating or measuring the average power of the additive white Gaussian noise on the set working bandwidth obtained by the base station side.
The above-mentionedOne specific setting method of (1) is as follows:
wherein: SINRCCH THFor a target signal-to-interference-and-noise ratio of an uplink control channel in an LTE-a system,the modulation and coding scheme level is the minimum value of target signal-to-interference-and-noise ratios corresponding to all the alternative modulation and coding scheme levels which can be adopted by an uplink data channel in the LTE-A system.
When using non-numerical expressions rather than empirical valuesWhen the conventional power reference value in (1) is set, for any one micro cell m, one of the enhanced power reference values takes into account the dynamic change of the uplink interference of the macro cell to the micro cell m as an expression:
wherein:for a nominal target signal-to-interference-and-noise ratio,ξ is 0 or 1, Δ I is the average value of the sum of the uplink interference power generated by the macro cell and other micro cells to the micro cell m and the noise power obtained by the measurement of the micro base station m, andMacro-Pico mand (3) estimating the change value of the uplink interference magnitude of the macro cell to the micro cell m for the macro base station.
ξ is 0 when the macro cell does not perform a new round of uplink power control, and the macro base station does not send a Δ I with a value of zero to the micro base station m over the backhaul linkMacro-Pico mξ is 1 when the macro cell performs a new round of uplink power control, and the macro base station sends a value of DeltaI to the micro base station m through the backhaul link, which is not zeroMacro-Pico m。
One specific setting mode of the nominal target signal-to-interference-and-noise ratio is a target signal-to-interference-and-noise ratio at the m edge of the microcell.
Compared with the prior art, the invention has the following advantages:
1) according to the enhanced uplink fractional power control method for the micro cell in the heterogeneous network, by the enhanced design of the power reference value, the cross-layer interference of the micro cell on the uplink of the macro cell can be effectively inhibited, and therefore the communication quality of the heterogeneous network in the LTE-A system is remarkably enhanced.
2) In the invention, a specific setting scheme is provided for the designed enhanced power reference value, so that the dynamic change of the uplink interference of the micro cell from the macro cell is also taken into consideration, and the suppression effect of the proposed enhanced uplink fractional power control method for the micro cell on the cross-layer interference of the uplink in the heterogeneous network is further enhanced.
3) The method provided by the invention has no influence (or only brings little influence) on the existing uplink power control scheme which is generally applied to the Macro layer occupying the core in the heterogeneous network.
4) In order to implement the method proposed by the present invention, the information that the macro base station needs to transmit to any one micro base station m through the backhaul link is only a small amount of useful reference information (including information that must be transmitted)And Δ I which may need to be transmittedMacro-Pico m) The magnitude of the additional signaling overhead generated when implementing the scheme is small.
Drawings
Fig. 1 is a schematic diagram of an uplink inter-cell interference situation in a scenario of co-channel deployment between a macro cell and a micro cell;
FIG. 2 is a schematic flow chart of the main steps of the present invention;
fig. 3 is a flow chart illustrating the sub-steps of step a.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 2 shows a flow chart of a method according to the invention. As can be seen from the figure: according to the enhanced uplink fractional power control method for the micro cell in the heterogeneous network of the LTE-A system, the heterogeneous network comprises a macro cell and a plurality of micro cells deployed in the macro cell, user equipment in the macro cell and user equipment in the micro cell are respectively served by the macro base station and the micro base station, and the method comprises the following steps:
first, in step a, any one user equipment PUE served by a micro cell m is set according to an allowable uplink interference magnitude of the macro base station, a measurement value of an average uplink interference magnitude generated by all micro cells deployed in the macro cell to the macro cell, and an uplink interference situation of any one micro cell m to the macro celliUpper limit value of the power reference value
Specifically, when a base station (including all macro base stations and micro base stations) transmits reference symbols (the reference symbols transmitted by different base stations are orthogonal to each other), each user equipment measures the power of the reference symbols received from its surrounding base stations (including its serving base station), and then reports the measured reference symbol received power to its serving base station. At any given base station, the pathloss between each ue served by the base station and the base stations surrounding the ue can be further estimated using the measured values of the received power of the reference symbols reported by the ues served by the base station.
In particular, for the receiving end of the uplink, i.e. the base station, P is usednoiseRepresents the average power in watts of Additive White Gaussian Noise (AWGN) over the operating bandwidth set by the LTE-a system. PnoiseThe estimation can be done using the following equation: pnoise＝Pnoise per HzX operating bandwidth x noise figure (i.e. noise figure); wherein, Pnoise per Hz＝10-174[dBm]/10×10-3(in watts), operating bandwidth (in hertz) is a given system parameter, and noise figure is 10 for ITU channel model or 3GPP SCM channel model, respectively7[dB]/10Or 109[dB]/10. Furthermore, PnoiseIt can also be obtained by measurement from the base station side, if such measurement is used to obtain PnoiseThe macro base station measures the obtained P due to the requirement of the subsequently designed algorithmnoiseNeeds to be sent to the micro base station deployed in the coverage area of the macro base station through a backhaul link. For simplicity, even if each base station uses such measurements to obtain PnoiseThe average power of additive white Gaussian noise measured at different base stations is also uniformly used as parameter PnoiseAnd performing identification.
In particular, the user equipment which generates the minimum uplink received signal strength at the macro base station among all the user equipment served by the macro base station is represented by MinRecSS MUE, andthe uplink transmit power (in watts) of the MUE is expressed as PLMeNB-MinRecSS MUEA measurement value representing the path loss between the MUE and the macro base stationTo represent the minimum signal-to-interference-and-noise ratio (or referred to as the target signal-to-interference-and-noise ratio) required for the MUE to achieve successful uplink signal transmission.
In one embodiment according to the present invention, the above can be set by using the following equationDetermining:wherein, the SINRCCH THFor the uplink in LTE-A systemA target signal-to-interference-and-noise ratio of the control channel, which is a system parameter having a given value; for uplink in LTE-A systemMinimum value of target signal-to-interference-and-noise ratios corresponding to all alternative modulation coding scheme levels available for link data channelIs a system parameter having a given value.
In particular, at any given macro base station, the macro base station may know or know by estimation, based on 1) the estimated path loss between the user equipment served by it and the base stations surrounding the user equipment, and 2) the new calculated value of the uplink transmit power of the user equipment served by it (if the macro base station decides to perform a new round of uplink power control), or the already in-use uplink transmit power value of the user equipment served by it (if the macro base station decides not to perform a new round of uplink power control for the moment), the macro base station may know or know by estimationPLMeNB-MinRecSS MUE，Is as follows. Further, byIndicating the allowable interference level of the macro base station, the macro base station may use the following equationAnd (4) estimating:
wherein, multiplyAt 103In order to convert units in the non-logarithmic domain from watts to milliwatts.
In particular, for any given macrocell, the identity is identifiedA measure of an average uplink interference level generated to the macrocell for a microcell deployed within the macrocell.Will be obtained by the base station of the macro cell through measurements (this magnitude will change if a new round of uplink power control is further performed by some or some of the respective micro cells).
As shown in fig. 3, step a further includes the steps of:
in sub-step a1, the macro base station sends reference information to any one of the micro base stations m deployed in the macro cell through the backhaul link, where the reference information includesAnd
next, in sub-step a2, the micro base station m estimates the uplink interference level of the micro cell to the macro cell currently
In particular, the number of PUEs served by the microcell m is identified as Tm. At the micro base station m, according to the measured value of the path loss between each PUE served by it and the macro base station(i＝1,…,Tm) And the value of the uplink transmission power already in use by each PUE served by it, i.e. can be estimated
Finally, the process is carried out in a batch,in sub-step a3, the micro bs m performs uplink power control on its own base stationEstimation of the change brought about, and failure to make the changeExceedAccording to the principle of MiAnd TmCalculating to obtain any user equipment PUE served by the micro cell miUpper limit value of the power reference valueWherein,(i＝1,…,Tm) For the user equipment PUEiMeasurement of the path loss between the micro base station M serving it, MiFor the PUE currently allocated to the user equipmentiThe number of physical resource modules.
In particular, the micro cell m if it is to target the T served by itmThe PUEs perform a new round of uplink power control, and then the uplink interference magnitude of the microcell m to the macrocell changes (by using the PUEs) after the microcell m completes the new round of uplink power controlIndicating this new interference magnitude) to further reduce interferenceThe magnitude of (a) brings about a change. In order to more effectively suppress the uplink interference of the micro cell m to the macro cell, the method is based on the changed uplink interferenceMust not exceedThe following can be derived:
in the above derivation, the conventional uplink fractional power control method as shown in equation (3) is used to combine the second inequalityA third inequality can be derived by unfolding. Finally, by further deduction of the third inequality mentioned above, and based on the PUEiThe upper limit value of the power reference value shown in the following equation can be derived by setting the value of the parameter α to 1 while fully compensating for the path loss:
next, in step B, setting up for any user equipment using the conventional uplink fractional power control methodDefining a power reference value and defining a suppressible microcell to macrocell obtained in the above step AEnhanced power reference value for uplink cross-layer interference of a zone:
specifically, the power reference valueThe method can be set to a specific empirical value obtained based on a network optimization approach, and can also be set by using a non-numerical expression.
Next, in step C, in the conventional uplink fractional power control method, an enhanced power reference value is adoptedSetting the value of partial path loss compensation factor to 1, thereby obtaining the enhanced uplink fractional power control method applied to the micro cell;
specifically, the value of the fractional pathloss compensation factor α is set to 1 in order to fully compensate for the pathloss of PUEs (i.e., the user equipments served by the pico cell), so that the enhanced uplink fractional power control method applied to the pico cell proposed in the present invention can achieve a good balance between "suppressing uplink cross-layer interference of the pico cell to the macro cell" and "ensuring uplink transmission performance of the pico cell".
Finally, any user equipment PUE served by the micro cell m is controlled by utilizing an enhanced uplink fractional power control methodiTransmit power ofThe specific expression is as follows:
in one embodiment according to the present invention, when a non-numerical expression is used instead of an empirical valueWhen the conventional power reference value is set, any one of the power reference values is usedA micro cell m, the enhanced powerThe reference value can further make the macro cell uplink to the micro cell mThe dynamic variation of the link interference is taken into account.
Specifically, for any one of the micro cells m, when it is set by an expression of a non-numerical value, one is commonThe expression of (a) is:wherein, the nominal target signal-to-interference-and-noise ratio represents the sum of uplink interference power and noise power generated by the macro cell and other micro cells to the micro cell mThe summed average of the rates, which will be obtained by the base station of the microcell m through measurement. If the macrocell and some of the other microcellsThe or some cells further perform a new round of uplink power control, expressed as average interferenceThe noise and noise levels may vary. However, in actual network deployment, through reasonable network planning, communication among micro cells is realizedNo obvious mutual interference exists; therefore, the significant change in magnitude of (A) is mainly performed by the macrocellA new round of uplink power control.
In particular, if the macro base station decides to perform a new round of uplink power control, at the macro base station, from the measured path loss between each MUE served by it and the base stations surrounding that MUE, and the new calculated value and the previously used value of the uplink transmit power of each MUE served by it, it is possible to estimate the uplink interference level of the macro cell (using the uplink interference level of the macro cell to the micro cell m before performing the new round of uplink power control)Expressed in terms of) and the uplink interference level of the macro cell to the micro cell m after performing a new round of uplink power control (in terms ofTo indicate). Further, with Δ IMacro-Pico mTo represent the dynamic change of the magnitude of uplink interference of the macro cell to the micro cell mValue, the macro cell may then pair Δ I with the following equationMacro-Pico mAnd (4) estimating:
specifically, the micro base station m may determine the conventional power reference valueThe following settings are set:
taking into account the dynamic variation of the uplink interference of the macro cell to the micro cell m, wherein the value of the parameter ξ is determined in such a way that the macro base station sends a delta I to the micro base station m over the backhaul link when the macro cell will perform a new round of uplink power controlMacro-Pico mξ is set to 1, when the macro cell will not perform a new round of uplink power control, the macro cell will not send a Δ I of 0 to the micro base station m over the backhaul linkMacro-Pico mξ is set to 0. furthermore, the micro base station m can set the enhanced power reference valueThe following settings are set:
to enable taking into account the dynamic variation of the uplink interference of the macro cell to the micro cell m.
In one embodiment according to the present invention, the nominal target SINR is as described aboveA specific setting manner of (2) is a target signal to interference and noise ratio at the edge of the microcell m.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Several elements recited in the apparatus claims may also be implemented by one element. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (8)
1. An enhanced uplink fractional power control method for a micro cell in a heterogeneous network is characterized by comprising the following steps:
A. setting any user equipment PUE served by a micro cell m according to the allowable uplink interference magnitude of a macro base station, the measurement value of the average uplink interference magnitude generated by all micro cells deployed in the macro cell to the macro cell and the uplink interference situation of any micro cell m to the macro celliUpper limit value of the power reference value
B. Utilizing a power reference value set for any UE in a conventional uplink fractional power control methodAnd obtained in step ADefining an enhanced power reference value for suppressing uplink cross-layer interference of a micro cell to a macro cell:
C. in the traditional uplink fractional power control method, an enhanced power reference value is adoptedAnd sets the value of the partial path loss compensation factor to 1, thereby controlling any one of the user equipment PUEs served by the microcell miTransmit power of
Wherein:for the user equipment PUEiMaximum allowed transmit power of, MiFor the PUE currently allocated to the user equipmentiThe number of the physical resource modules of (a),for the user equipment PUEiAnd the micro base station m serving it.
2. The method as claimed in claim 1, wherein the upper bound of the power reference value is the upper bound of the power reference valueThe method specifically comprises the following steps:
wherein:the allowable interference level for the macro base station,for a measure of the average uplink interference level generated by all the microcells deployed within a macrocell on that macrocell,for the microcell m at the current uplink interference level to the macrocell before performing a new round of uplink power control,for user equipment PUEiA measure of path loss with the macro base station; t ismIs the number of all user equipments served by the microcell m.
3. The method as claimed in claim 2, wherein the upper bound of the power reference value is the upper bound of the power reference valueThe obtaining process specifically comprises the following steps:
A1. the macro base station sends reference information to the micro base station m through a return link, wherein the reference information comprisesAnd
A2. the micro base station m estimates the uplink interference magnitude of the micro cell to the macro cell at present according to the path loss value between each user equipment served by the micro base station m and the macro base station and the uplink transmission power value used by each user equipment served by the micro base station m
A3. The micro base station m is based on the pair after completing a new round of uplink power controlEstimation of the change brought about, and failure to make the changeExceedIn the principle of (a) is,
according toMiAnd TmCalculating to obtain any user equipment PUE served by the micro cell miUpper limit value of the power reference value
4. The method of claim 3, wherein the macro base station has an allowable interference level, and wherein the macro base station performs the method according to the allowable interference levelSpecifically estimated as:
wherein: the user equipment that produces the smallest uplink received signal strength at the macro base station among all the user equipments served by the macro base station is identified as MinRecSS MUE,is the uplink transmit power, PL, of the MUEMeNB-MinRecSS MUEIs a measure of the path loss between the MUE and the macro base station,minimum signal to interference plus noise ratio, P, required for the MUE to achieve successful uplink signal transmissionnoiseAnd estimating or measuring the average power of the additive white Gaussian noise on the set working bandwidth obtained by the base station side.
5. The method as claimed in claim 4, wherein the method for enhanced uplink fractional power control of micro cell in heterogeneous network is characterized in thatOne specific setting method of (1) is as follows:
wherein: SINRCCHTHFor a target signal-to-interference-and-noise ratio of an uplink control channel in an LTE-a system,the modulation and coding scheme level is the minimum value of target signal-to-interference-and-noise ratios corresponding to all the alternative modulation and coding scheme levels which can be adopted by an uplink data channel in the LTE-A system.
6. The method of claim 1, wherein the non-numerical expression is used instead of an empirical value for the enhanced uplink fractional power control of the micro cell in the heterogeneous network
The conventional power reference value inWhen setting, the enhanced power reference value is set for any micro cell mAn expression for taking into account the dynamic variation of uplink interference of the macro cell to the micro cell m is:
wherein:for a nominal target signal-to-interference-and-noise ratio,for the macro cell and other micro cells obtained by measurement of the micro base station mThe average value ξ of the sum of the uplink interference power generated by the cell to the microcell m and the noise power added is 0 or 1, Δ IMacro-Pico mAnd (3) estimating the change value of the uplink interference magnitude of the macro cell to the micro cell m for the macro base station.
7. The method of claim 6, wherein ξ is 0 when the macro cell does not perform a new round of uplink power control, and the macro base station does not send a zero Δ I to the micro base station m through the backhaul linkMacro-Pico mξ is 1 when the macro cell performs a new round of uplink power control, and the macro base station sends a value of DeltaI to the micro base station m through the backhaul link, which is not zeroMacro-Pico m。
8. The method as claimed in claim 6, wherein a specific setting manner of the nominal target signal-to-interference-and-noise ratio is a target signal-to-interference-and-noise ratio at m-edge of the micro cell.
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