CN104812042A - Method for controlling transmission power - Google Patents
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- CN104812042A CN104812042A CN201410041266.0A CN201410041266A CN104812042A CN 104812042 A CN104812042 A CN 104812042A CN 201410041266 A CN201410041266 A CN 201410041266A CN 104812042 A CN104812042 A CN 104812042A
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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
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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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
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Abstract
The invention discloses a method for controlling transmission power. The method is applicable to D2D transmission and uplink transmission of common frequency division multiplexing uplink resources. A method of a base station side includes the steps: A, configuring power control parameters for a D2D client and an uplink client; B, broadcasting the configured power control parameters into a wireless network through system information or configured information; C, measuring the disturbance degree of a transmission signal transmitted by the D2D client for an uploading signal of the uplink client; D, adjusting parts of the power control parameters according to measuring results of the disturbance degree; E, broadcasting the adjusted power control parameters into the wireless network through the system information or the configured information. The invention further discloses corresponding methods implemented by the D2D client and the uplink client.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method for controlling transmission power of a ue in a wireless network.
Background
In the discussion of 3GPP D2D (device to device) study (e.g., the study item in R12), it has been agreed that D2D transmissions may occupy configurable time periods and frequency resources in uplink carriers (in frequency division multiplexing FDD mode) or uplink subframes (in time division multiplexing TDD mode). This means that: as with a typical cellular network, in D2D transmissions (e.g., D2D discovery), downlink carriers or subframes are still used for transmission of downlink data. In this case, a problem inevitably occurs: during the time that the activated D2D transmission is continuously in the configured D2D transmission timing (assuming frequency division multiplexing is not uncommon here), some uplink control information still needs to be transmitted (e.g., ACK/NACK feedback for downlink packets). Thus, in the subframe of D2D, the transmission of some cellular channels (e.g., PUCCHs) would have to be frequency division multiplexed with the transmission of D2D to share the uplink frequency resources in the wireless network. In this case, such a technical problem can be naturally imagined: is the D2D transmission adversely affecting the reception of information in the PUCCH by the base station? How to avoid this potential adverse effect if at all?
In fact, although the resources used for D2D transmission and the resources used for PUCCH transmission are mutually orthogonal frequency resources, D2D transmission does have a potential impact on frequency division multiplexed PUCCH transmission. This potential effect stems from the in-band emission interference (in-band emission interference) from the D2D transmission. An example model of the in-band transmit interference defined in 3gpp tr36.843v1.0 is shown in fig. 1. A signal in physical resource block number 5 causes general in-band transmission interference (e.g., interference on physical resource blocks number 5-10), in-band transmission interference due to carrier leakage (e.g., interference on physical resource block number 25), and in-band transmission interference due to IQ mirroring (e.g., interference on physical resource block number 46) on signals of other physical resource blocks. Therefore, we can easily imagine that D2D transmissions, especially D2D transmissions near the base station, will cause significant in-band interference on the resources occupied by PUCCH. Fig. 2 shows the system level evaluation of an "in-band interference over thermal noise" (IBIoT), where D2D that generated the in-band interference found the transmitter to use a fixed 23dBm transmission power. From the figure we can find that the in-band interference to thermal noise ratio can be on average up to over 40dB, which completely drowns out the useful PUCCH signal at the base station receiver side. Therefore, a technical solution is urgently needed to solve the problem, and the technical problem to be solved by the invention is exactly the problem.
Disclosure of Invention
In order to solve the above technical problem, according to an aspect of the present invention, a method for transmitting power P to D2D ue at base station side is disclosedD2DThe D2D ue is located in the coverage of the base station, and the D2D ue and other uplink ues that need to send uplink information to the base station use uplink frequency resources in a wireless network in a frequency division multiplexing manner, wherein: A. configuring power control parameters for the D2D ue and the uplink ue; B. broadcasting the configured power control parameters to the wireless network through system information or configuration information; C. measuring the interference degree of the transmission signal sent by the D2D user side to the uploading signal of the uplink user side; D. adjusting part of the power control parameters according to the measurement result of the interference degree; E. broadcasting the adjusted power control parameter to the wireless network via system information or configuration information.
In particular, the power control parameters include: the maximum transmission power parameter P of the carriers configured for the D2D user side and the uplink user sideCMAX，C(ii) a Public PUCCH power control parameter P configured for uplink user terminalO_Norminal_PUCCH(ii) a D2D specific power control parameter delta configured for the D2D user terminalD2D。
In particular, in the step D, when the measurement result of the interference degree exceeds a predetermined limit range, the D2D specific power control parameter Δ is decreasedD2DA value of (d); increasing the D2D specific power control parameter Δ when the measured interference level is below the predetermined limit rangeD2DA value of (d); maintaining the D2D-specific power control parameter Δ when the measure of the degree of interference is within the predetermined limitD2DThe value of (c).
In particular, the step a further includes a1. presetting a signal-to-noise ratio threshold γPUCCHIt represents a critical value of the ratio of the uplink signal of the uplink ue to the in-band interference at the base station side, where the in-band interference is: interference of transmission signals sent by the D2D user side on uplink signals of the uplink user side; a2. according to the signal-to-noise ratio threshold value gammaPUCCHConfiguring the D2D specific power control parameter ΔD2D。
In particular, in said step a 2: according to equation PO_Norminal_PUCCH-(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2D)-36)>γPUCCHConfiguring the D2D specific power control parameter ΔD2DA value of (b), wherein said NPRB_D2DThe number of physical resource blocks used by the frequency domain where the D2D user terminal is located.
In particular, in step a, the D2D specifies the power control parameter ΔD2DIs a value preset according to the transmission condition of the wireless network.
In particular, in said step DWhen the measurement result of the interference degree exceeds a preset limit range, configuring a special PUCCH power control parameter P for the uplink user terminalO-UE-PUCCHBy the dedicated PUCCH power control parameter PO_UE_PUCCHTo increase the transmission power of the uplink ue.
In particular, the method also comprises the following steps: configuring the transmission power PD2DAnd broadcasting the quantized set into the wireless network, elements in the quantized setAnd the transmission power PD2DThe corresponding relation is as follows:
wherein, { P0，P1，...，PM-1Is the transmission power PD2DM is the number of elements in the quantization set.
In particular, in the step a, configuring a defined D2D transmission resource set, where the defined D2D transmission resource set is composed of defined D2D transmission resources, and the defined D2D transmission resources are relatively far away from the transmission resources used by the uplink user terminals to transmit uplink information in the frequency domain; in step B, broadcasting the defined set of D2D transmission resources into the wireless network via system information or configuration information.
According to another aspect of the present invention, a method for transmitting power P to D2D user terminal at D2D user side is disclosedD2DThe D2D user end is located in the coverage of the base station, the D2D user end and other uplink user ends that need to send uplink information to the base station use the uplink frequency resources in the wireless network together in a frequency division multiplexing manner, wherein: periodically receiving system information or configuration information broadcast by the base station and obtaining power control parameters from the system information or configuration information; measuring a path loss PL from the base station; determining the transmission power P of the D2D user terminal according to the power control parameter and the path lossD2D。
In particular, the power control parameters include: the maximum transmission power parameter P of the carriers configured for the D2D user side and the uplink user sideCMAX，C(ii) a Public PUCCH power control parameter P configured for uplink user terminalO_Norminal_PUCCH(ii) a D2D specific power control parameter delta configured for the D2D user terminalD2D。
In particular, according to the formula: pD2D=min{PCMAX，c，PO_Nonninal_PUCCH+PL+ΔD2DDetermine the transmission power P of the D2D user terminalD2D。
In particular, the method also comprises the following steps: receiving a quantization set { P) transmitted by the base station0，P1，...，PM-1According to the formula: <math>
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</math> transmission power P to the D2D user terminalD2DPerforming quantization and quantizing the transmission powerAs the transmission power of the D2D ue, where M is the number of elements in the quantization set.
In particular, the method also comprises the following steps: receiving system information or configuration information broadcast by the base station and obtaining therefrom a defined set of D2D transmission resources; when the transmission power P of the D2D user terminalD2DLess than the minimum quantization power P in the quantization set0Using a defined D2D resource of the defined set of D2D transmission resources as a transmission resource for D2D transmissions; wherein, in the frequency domain, the limited D2D transmission resource is relatively far away from the transmission resource used by the uplink user end for transmitting the uplink information.
According to another aspect of the present invention, a method for controlling transmission power of an uplink ue at an uplink ue side is disclosed, where the uplink ue is a ue that needs to send uplink information to a base station, a D2D ue is located within a coverage area of the base station, and the D2D ue and the uplink ue use uplink frequency resources in a wireless network together in a frequency division multiplexing manner, where: periodically receiving system information or configuration information broadcast by the base station and obtaining power control parameters from the system information or configuration information; according to the common PUCCH power control parameter P in the power control parametersO_Norminal_PUCCHDetermining the transmission power of the uplink user terminal; when acquiring the special PUCCH power control parameter P from RRC signaling in a downlink channel of the uplink user terminalO-UE-PUCCHWhen the current is over; according to the power control parameter P of the public PUCCHO_Norminal_PUCCHAnd the special PUCCH power control parameter PO-UE-PUCCHAnd determining the transmission power of the uplink user terminal.
The scheme disclosed by the invention has the following advantages: when the wireless network implements the D2D transmission application, the interference of D2D transmission on the PUCCH channel in uplink transmission can be avoided, the in-band transmission interference caused by the fixed transmission power used by D2D transmission on the uplink transmission of the uplink user in the prior art is overcome, the signal-to-noise ratio of the PUCCH channel is improved, and the use efficiency of the transmission power is improved.
Drawings
The above and other features of the present invention will become more apparent from the following detailed description of the embodiments thereof, when taken in conjunction with the accompanying drawings, wherein like or similar reference characters designate like or similar steps;
fig. 1 shows an exemplary model diagram of in-band transmit interference as defined in 3GPP tr36.843v1.0;
FIG. 2 shows a system level evaluation of "in-band interference over thermal noise" (IBIoT) on PUCCH physical resource blocks;
fig. 3 is a flowchart of a method for controlling the transmission power PD2D of the D2D subscriber side at the base station side according to the present disclosure;
FIG. 4 illustrates a method for transmitting power P on the user side of D2D according to the present inventionD2DA method flow diagram of implementing the control;
fig. 5 is a flowchart illustrating a method for controlling transmission power of an Uplink user terminal at the Uplink user side according to the present invention;
fig. 6 shows a diagram of the Cumulative Distribution Function (CDF) of the signal to interference plus noise ratio (SINR) on the PUCCH signal received at the base station side;
fig. 7 shows a diagram of the Cumulative Distribution Function (CDF) of D2D transmission power with and without power control; and
fig. 8 shows a plot of the Cumulative Distribution Function (CDF) of the signal to interference plus noise ratio (S1NR) at the D2D receiver with and without power control.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It should be noted that although the steps of the methods of the present invention are described herein in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results, but rather that the steps described herein can be performed in an order that varies. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
In the description herein, for convenience of illustration, for the ue transmitting data by using the D2D method, we refer to it as the D2D ue; for a ue transmitting uplink data (e.g. PUCCH) to a corresponding base station in a wireless network, the ue is referred to as an uplink ue.
It should be noted that the D2D ue and the uplink ue in the present invention are located in the same coverage area of the base station, and the D2D ue and the uplink ue use the uplink frequency resources in the wireless network together in a frequency division multiplexing manner. That is, the method disclosed by the present invention is applicable to the case of D2D transmission and uplink transmission of common frequency division multiplexing uplink resources.
In the 3GPP D2D study, it is assumed that the D2D user terminal uses a fixed transmit power (e.g., 23 dBm). Under the fixed transmission power configuration, the ue close to the base station may cause high in-band interference to the uplink data (e.g. data in PUCCH) received by the base station from the uplink ue (as shown in fig. 2). In order to reduce the influence of D2D transmission on the uplink data received by the base station, the invention configures the D2D transmission power into an open loop power control mode to replace the original fixed transmission power mode.
Fig. 3 shows a diagram of the transmission power P for D2D subscriber side at the base station side according to the present disclosureD2DA flow chart of a method of implementing control that mitigates interference of transmissions between D2D ues with uplink transmissions at an upstream ue. Wherein, the D2D ue and the uplink ue are located within the signal coverage of the base station.
In step 302, the base station configures power control parameters for the D2D ue and the uplink ue.
Specifically, for open loop power control, the transmission power of D2D is not fixed, and the D2D ue needs to dynamically set the transmission power according to the power control parameter. In order to enable the D2D ue to properly set the transmission power, according to an embodiment of the present disclosure, the base station configures the following power control parameters for the D2D ue:
PCMAX，C: the unit is dBm, which represents the maximum transmission power allowed to be used per carrier for all the ues covered by the base station.
ΔD2D: in dB, is a D2D specific power control parameter, which represents a correction value of the transmission power for correcting the magnitude of the transmission power. Which is used among all D2D users covered by the base station. The base station may set the D2D specific power control parameters appropriately according to the specific application. The parameter may be set according to equation (1) as shown below:
PONorminal_PUCCH-(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2d)-36)>γPUCCH(1) the left side of equation (1) represents the power ratio of the PUCCH signal transmitted by the uplink ue received by the base station to the in-band interference caused by D2D transmission near the base station. Parameter y to the right of the formulaPUCCHRepresents the assumed SIR: (Signal to noise ratio) threshold. Symbol NPRB_D2DThe number of physical resource blocks used in the frequency domain where the D2D user terminal is located is shown. The symbol-36 indicates the typical starting level of in-band interference (e.g., the power diagram shown in fig. 1, the starting level of both signal and interference is-36 dB), which can be replaced with an arbitrary value depending on the starting level of in-band interference in the system. (P)O_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2d) 36) representing the in-band interference caused by D2D transmissions in the vicinity of the base station.
For example, assume NPRB_D2DIs 44 and is gammaPUCCHIs-3 dB, we can obtain ΔD2D<22.56 (dB). It is to be noted that the Δ is obtained by the above formula (1)D2DIs a plurality of configurations of the ΔD2DOne of the ways of (1). In practical implementation, other setting manners are not excluded, for example, a value estimated according to the transmission condition of the wireless network may be used as the D2D specific power control parameter ΔD2DSimilarly, the value of (b) may be set based on actual operation experience.
It is further noted that in this example, the D2D specific power control parameter Δ configured in step 302D2DIs only an initial value and may need further adjustment based on actual measurements and PUCCH.
In addition, the base station configures the following power control parameters for the uplink ue:
PO_Norminal_PUCCH: the unit is dBm, which is a common power control parameter of the uplink ue, and the reference transmission power of the uplink ue is usually set to PO_Norminal_PUCCH+ PL, where PL is the path loss from the uplink UE to the BS. Although this parameter is used for transmission power control of the upstream ue, the D2D ue also needs to obtain the parameter in order to enable the ue of D2D to set the appropriate D2D transmission power according to the transmission power of the upstream ue.
After obtaining the power control parameters, the D2D ue can calculate the transmission power of the D2D ue by combining the path loss PL between the D2D ue and the base station. According to the disclosed embodiment of the present invention, power control equation (2) may be used:
PD2D=min{PCMAX,c，PO_Norminal_PUCCH+PL+ΔD2Dand (2) calculating the transmission power of the D2D user terminal.
In another specific embodiment, the step 304 further includes configuring a defined D2D transmission resource set, the defined D2D transmission resource set is composed of defined D2D transmission resources, and the defined D2D transmission resources are relatively distant from the transmission resources used by the upstream ue to transmit the upstream information in the frequency domain. The defined set of D2D transmission resources may be broadcast in step 304 through a base station into a wireless network.
In step 304, the base station broadcasts the configured power control parameter to the wireless network through system information or configuration information.
Specifically, in this step, the configured power control parameter is put into system information or configuration information, and then the power control parameter is sent to the wireless network in a broadcast manner, and a D2D ue located in the coverage area of the base station signal may obtain the required power control parameter by receiving the system information or configuration information broadcast by the base station. After the D2D ue obtains the power control parameters, it sets the corresponding D2D transmission power according to the parameters, and performs D2D information transmission.
In step 306, the base station measures the interference level of the transmission signal sent by the D2D ue to the uplink signal of the uplink ue.
Specifically, the base station measures the strength of the in-band interference generated by the D2D transmission signal at the base station side and the strength of the uplink signal sent by the uplink user end, so as to determine the interference degree of the in-band interference and whether the in-band interference affects the base station to normally receive the uplink signal.
In step 308, the base station adjusts a part of the power control parameters according to the measurement result of the interference degree.
Specifically, a limit range of the degree of interference may be set, and the upper limit of the range may represent: the maximum interference degree that the base station can bear is not influenced under the condition that the base station normally receives the uplink signal sent by the uplink user terminal. The lower limit of the range may represent: when the base station normally receives the uplink signal sent by the uplink user terminal, the base station can ignore the maximum interference degree.
In one example disclosed herein, the D2D-specific power control parameter Δ is decreased when the measure of the degree of interference exceeds a predetermined limit rangeD2DA value of (d); so as to reduce the transmission power of D2D and avoid the transmission power of D2D from affecting the reception of the uplink signal transmitted by the uplink ue by the base station.
Increasing the D2D specific power control parameter Δ when the measured interference level is below the predetermined limit rangeD2DA value of (d); so that the transmission power of D2D can obtain the largest possible value without affecting the base station receiving the uplink signal sent by the uplink user terminal.
Maintaining the D2D-specific power control parameter Δ when the measure of the degree of interference is within the predetermined limitD2DThe value of (c).
The D2D specific power control parameter ΔD2DWill be broadcast by the base station into the wireless network in step 310 via system information or configuration information.
However, even if the D2D-specific power control parameter Δ is adjusted using the above methodD2DAlthough the interference from the D2D transmission is greatly reduced by power control of D2D, it is still significantly larger than the interference of non-D2D subframes. Therefore, in order to ensure the quality of the PUCCH channel received by the base station, the base station is adjusted to be on the right sidePower control parameters of the row user terminal.
According to an embodiment disclosed in the present invention, in order to avoid the inherent influence of the power control of the uplink user end on the power control of D2D, a dedicated PUCCH power control parameter P is sent to the uplink user end through RRC signalingO-UE-PUCCHTo further adjust the transmission power of the uplink ue. Usually, the base station configures the special PUCCH power control parameter P based on the measurement result of the in-band interference degree on the base station sideO-UE-PUCCH. It should be noted that the dedicated PUCCH power control parameter P isO-UE-PUCCHAre configured according to different uplink clients respectively.
In practical implementation, the dedicated PUCCH power control parameter PO-UE-PUCCHIs configured in an initial stage of the D2D subframe, and in a later timing, updates the dedicated PUCCH power control parameter P based on an actual measurement value for the D2D subframeO-UE-PUCCH. The special PUCCH power control parameter PO-UE-PUCCHAnd sending the data to each uplink user terminal through RRC signaling.
In step 310, the adjusted power control parameter is broadcasted to the wireless network via system information or configuration information.
Specifically, the base station adjusts the adjusted power control parameter, e.g., D2D specific power control parameter ΔD2DThe D2D ue located in the coverage area of the base station signal may obtain the required power control parameter by receiving the system information or configuration information broadcast by the base station.
According to another embodiment of the present disclosure, after step 310 is completed, step 306 is repeatedly executed, so that steps 306 to 310 are repeatedly executed in a cyclic manner, thereby continuously measuring the interference level of the transmission signal sent by the D2D ue on the uplink signal of the uplink ue, and adjusting the power control parameter according to the interference level.
Additionally, in some implementations, the transmission power used by the D2D transmitter needs to be informed to the D2D receiver for certain purposes (e.g., to enable estimation of the neighbor distance). In this regard, according to another embodiment of the present disclosure, step 302 further includes: configuring transmission power PD2DThe quantization set of (2). Thus, based on a given set of transmit powers, the D2D transmit power used in open loop power control may be quantized according to the quantized set, which may be predefined in system specifications or configured by the base station, and broadcast by the base station into the wireless network in a semi-static manner in step 304. Quantizing elements in the setAnd the transmission power PD2DThe corresponding relation is as follows:
wherein, { P0，P1，...，PM-1Is the transmission power PD2DM is the number of elements in the quantization set.
Fig. 4 shows the transmission power P on the user side of D2D according to the above disclosed schemeD2DA method flow diagram of implementing the control.
In step 402, system information or configuration information broadcast by the base station is periodically received and power control parameters are obtained therefrom.
Specifically, the D2D ue periodically obtains the system information or configuration information broadcasted by the base station, and obtains the power control parameter therefrom: deltaD2D、PO_Norminal_PUCCHAnd PCMAX， C(these parameters have already been introduced above and will not be described in detail here).
According to another embodiment of the present disclosure, step 402 further comprises obtaining a quantization set { P } transmitted by the base station from the system information or the configuration information0，P1，...，PM-1}。
In step 404, the D2D user terminal measures the path loss between the user terminal and the base station. Various prior art methods for measuring the path loss can be implemented in the present method to obtain the path loss between the D2D ue and the base station, which are not further discussed herein.
In step 406, the D2D ue determines the transmission power P of the D2D ue according to the power control parameter and the pathlossD2D. According to one embodiment of the invention, a method for calculating D2D transmission power P according to power control parameter and path loss is providedD2DThe method of (1). That is, according to the formula:
PD2D=min{PCMAX，c，PO_Norminal_PUCCH+PL+ΔD2D} (2)
the transmission power of the D2D subscriber terminal is obtained through calculation. Of course, the invention is not limited to obtaining the transmission power of the D2D ue according to this formula. Other D2D user end transmission power P obtained according to the power control parameterD2DThe same applies to the present invention.
In step 408, the D2D user side performs step 40 on the basis of the quantization set obtained in step 402 or the quantization set predefined in the system6 determined transmission power PD2DPerforming quantization to obtain quantized D2D transmission powerThe quantization process may be implemented according to equation (3):
in equation (3), if the transmission power value calculated according to the power control equation (2) is less than the minimum quantized power value P0The actually applied transmission power value may be 0 or the minimum power value P configured as per base station0。
In the former example (transmission power value is set to 0), it means that when one D2D user moves to the vicinity of the base station, so that the transmission power value calculated from the power control formula (2) is too low, this will make the D2D user terminal unable to transmit D2D information, and only able to receive D2D information from other D2D users.
In the latter case (transmission power P)D2DWhen less than P0Then handleSet to the minimum quantized power value P0) That means when a D2D user moves to the base stationRecently, the D2D ue is allowed to use the minimum transmission power P0D2D transmission is performed. To reduce potential in-band interference to base stations, it is recommended that D2D user terminals may use only a defined D2D resource (automatically selected or allocated by a base station) of some defined D2D resource sets. The PRB resources in the defined D2D resource set are relatively far away from the PRB resources used by the PUCCH channel of the uplink user end in the frequency domain. It can be seen from fig. 1 that the in-band transmit interference in the vicinity of the physical resource block used adjacent to D2D is still relatively high. The configuration information for the defined set of D2D resources may be broadcast with other power control parameters in system information through the base station into the wireless network.
Fig. 5 is a flowchart of a method for controlling transmission power of an uplink ue on the uplink ue side according to the above-disclosed scheme.
In step 502, the uplink ue periodically receives the system information or configuration information broadcasted by the base station, and obtains power control parameters from the system information or configuration information. The power control parameter comprises PO_Norminal_PUCCH。
In step 504, the uplink ue determines whether the RRC signaling in the downlink channel includes a dedicated PUCCH power control parameter PO-UE-PUCCHWhen the RRC signaling contains the special PUCCH power control parameter PO-UE-PUCCHIf so, go to step 508; when the dedicated PUCCH power control parameter P is not included in RRC signalingO-UE-PUCCHThen step 506 is performed.
In step 506, the uplink ue according to the common PUCCH power control parameter P in the power control parametersO_Norminal_PUCCHAnd determining the transmission power of the uplink user terminal.
In step 508, the uplink ue controls the parameter P according to the common PUCCH powerO_Norminal_PUCCHAnd the special PUCCH power control parameter PO-UE-PUCCHAnd determining the transmission power of the uplink user terminal. I.e. in the original PO_Norminal_PUCCHOn the basis of PO-UE-PUCCHThereby improving the transmission power of the uplink user terminal.
The effectiveness of the above scheme will be verified by a system level simulation. Table-1 lists the main parameters of the simulation. Fig. 6-8 show simulation results.
Fig. 6 shows a diagram of the Cumulative Distribution Function (CDF) of the signal to interference plus noise ratio (SINR) on the PUCCH signal received at the base station side; in fig. 6, we can find that approximately 30% of the received PUCCHs have a signal-to-interference-plus-noise ratio (SINR) below 5dB when the disclosed D2D transmission power control scheme is not implemented, however, almost all of the received PUCCHs have a signal-to-interference-plus-noise ratio (SINR) exceeding-5 dB when the power control scheme proposed by the present invention is applied. The potential impact of D2D transmissions on PUCCH reception is substantially avoided.
Fig. 7 shows a diagram of the Cumulative Distribution Function (CDF) of the D2D transmission power with and without power control. From the figure, it can be seen that when the ue uses the transmission power control scheme disclosed in the present invention, more than 40% of the D2D ues use transmission power greater than 0 dBm.
One possible concern with using D2D transmission power control is: low power transmission may negatively impact the operation of D2D transmissions (e.g., D2D neighbor discovery). The relevant simulation results are shown in fig. 8. Fig. 8 shows a diagram of the Cumulative Distribution Function (CDF) of the number of neighbors found at the D2D receiver with and without power control. The figure shows the Cumulative Distribution Function (CDF) of the number of neighbor users discovered by each D2D discovery receiver in a discovery period. It can be seen from the figure that under power control conditions, although the D2D transmission power is reduced, there is ultimately only a limited reduction in the number of neighbors found. The reason is that: while the useful signal power is reduced, on the other hand, the in-band interference from other D2D transmissions and the uplink user's PUCCH transmission is also reduced. Therefore, using the power control scheme disclosed in the present invention, the neighbor discovery performance degradation is very limited.
TABLE-1
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 (15)
1. Transmission power P for D2D user terminal at base station sideD2DThe D2D ue is located in the coverage of the base station, and the D2D ue and other uplink ues that need to send uplink information to the base station use uplink frequency resources in a wireless network in a frequency division multiplexing manner, wherein:
A. configuring power control parameters for the D2D ue and the uplink ue;
B. broadcasting the configured power control parameters to the wireless network through system information or configuration information;
C. measuring the interference degree of the transmission signal sent by the D2D user side to the uploading signal of the uplink user side;
D. adjusting part of the power control parameters according to the measurement result of the interference degree;
E. broadcasting the adjusted power control parameter to the wireless network via system information or configuration information.
2. The method of claim 1, wherein the power control parameter comprises:
a maximum transmission power parameter P of carriers configured for the D2D user terminalCMAX，C；
Public PUCCH power control parameter P configured for uplink user terminalO_Norminal_PUCCH；
D2D specific power control parameter delta configured for the D2D user terminalD2D。
3. The method of claim 2, wherein, in said step D,
reducing the D2D specific power control parameter Δ when the measurement of the degree of interference exceeds a predetermined limit rangeD2DA value of (d);
increasing the D2D specific power control parameter Δ when the measured interference level is below the predetermined limit rangeD2DA value of (d);
maintaining the D2D-specific power control parameter Δ when the measure of the degree of interference is within the predetermined limitD2DThe value of (c).
4. The method of claim 3, further comprising, in step A,
a1. presetting signal-to-noise ratio threshold gammaPUCCHIt represents a critical value of the ratio of the uplink signal of the uplink ue to the in-band interference at the base station side, where the in-band interference is: the D2D client sendsInterference of the transmitted transmission signal on an uplink signal of an uplink user terminal;
a2. according to the signal-to-noise ratio threshold value gammaPUCCHConfiguring the D2D specific power control parameter ΔD2D。
5. The method of claim 4, wherein in step a 2: according to equation PO_Norminal_PUCCH-(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2D)-36)>γPUCCHConfiguring the D2D specific power control parameter ΔD2DA value of (b), wherein said NPRB_D2DThe number of physical resource blocks used by the frequency domain where the D2D user terminal is located.
6. The method according to claim 3, wherein in step A, the D2D specific power control parameter ΔD2DIs a value preset according to the transmission condition of the wireless network.
7. The method of claim 2 or 3,
in step D, when the measurement result of the interference degree exceeds a predetermined limit range, configuring a dedicated PUCCH power control parameter P for the uplink ueO-UE-PUCCHBy the dedicated PUCCH power control parameter PO_UE_PUCCHTo increase the transmission power of the uplink ue.
8. The method of claim 7, further comprising:
configuring the transmission power PD2DAnd broadcasting the quantized set into the wireless network, elements in the quantized setAnd the transmission power PD2DThe corresponding relation is as follows:
wherein, { P0，P1，...，PM-1Is the transmission power PD2DM is the number of elements in the quantization set.
9. The method of claim 8, wherein:
in the step a, configuring a defined D2D transmission resource set, where the defined D2D transmission resource set is composed of defined D2D transmission resources, and the defined D2D transmission resources are relatively far away from the transmission resources used by the uplink user terminals to transmit uplink information in the frequency domain;
in step B, broadcasting the defined set of D2D transmission resources into the wireless network via system information or configuration information.
10. Transmission power P for D2D user side at D2D user sideD2DThe D2D user end is located in the coverage of the base station, the D2D user end and other uplink user ends that need to send uplink information to the base station use the uplink frequency resources in the wireless network together in a frequency division multiplexing manner, wherein:
periodically receiving system information or configuration information broadcast by the base station and obtaining power control parameters from the system information or configuration information;
measuring a path loss PL from the base station;
determining the transmission power P of the D2D user terminal according to the power control parameter and the path lossD2D。
11. The method of claim 10, wherein the power control parameter comprises:
a maximum transmission power parameter P of carriers configured for the D2D user terminalCMAX，C；
Public PUCCH power control parameter P configured for uplink user terminalO_Norminal_PUCCH；
D2D specific power control parameter delta configured for the D2D user terminalD2D。
12. The method of claim 11, wherein, according to the formula:
PD2D=min{PCMAX，c，PO_Norminal_PUCCH+PL+ΔD2Ddetermine the transmission power P of the D2D user terminalD2D。
13. The method of claim 12, further comprising:
receiving a quantization set { P) transmitted by the base station0，P1，...，PM-1According to the formula:
14. The method of claim 13, further comprising:
receiving system information or configuration information broadcast by the base station and obtaining therefrom a defined set of D2D transmission resources;
when the transmission power P of the D2D user terminalD2DLess than the minimum quantization power P in the quantization set0Using a defined D2D resource of the defined set of D2D transmission resources as a transmission resource for D2D transmissions;
wherein, in the frequency domain, the limited D2D transmission resource is relatively far away from the transmission resource used by the uplink user end for transmitting the uplink information.
15. A method for controlling transmission power of uplink ue at an uplink ue side, wherein the uplink ue is a ue that needs to send uplink information to a base station, a D2D ue is located within a coverage area of the base station, and the D2D ue and the uplink ue use uplink frequency resources in a wireless network in a frequency division multiplexing manner, wherein:
periodically receiving system information or configuration information broadcast by the base station and obtaining power control parameters from the system information or configuration information;
according to the common PUCCH power control parameter P in the power control parametersO_Norminal_PUCCHDetermining the transmission power of the uplink user terminal; wherein,
when acquiring the special PUCCH power control parameter P from the RRC signaling in the downlink channel of the uplink user terminalO-UE-PUCCHThe method comprises the following steps: according to the power control parameter P of the public PUCCHO_Norminal_PUCCHAnd the special PUCCH power control parameter PO-UE-PUCCHAnd determining the transmission power of the uplink user terminal.
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