CN105813186A - Transmission power determining method, device and system for user equipment - Google Patents
Transmission power determining method, device and system for user equipment Download PDFInfo
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Abstract
The invention provides a transmission power determining method, device and system for user equipment. A base station configures a power correlation parameter set corresponding to the current communication mode for the user equipment according to the current communication mode of the served user equipment. The user equipment can adjust the transmission power accordingly. Specifically, when the user equipment is in D2D communication, according to the possibility of interference of D2D communication on a cellular link, the current transmission power of the user equipment is adjusted. By reducing the current transmission power, the interference of the user equipment on an uplink of the base station is reduced. Preferably, in the case of no uplink interference or small uplink interference, the current transmission power is appropriately enhanced to enhance D2D performance. When the user equipment is in communication with the base station and reuses the same sub frame set with other user equipment in D2D communication, the current transmission power of the user equipment is configured to reduce the interference on D2D user equipment.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a technique for determining a transmit power for a User Equipment (UE).
Background
The advent of location-based social networks currently has raised widespread interest in proximity-networks (proximity-aware) that can provide communication services for user devices that communicate directly between devices (D2D). D2D under a cellular system (cellular architecture) may provide many communication opportunities, thereby increasing the throughput of the communication system and improving the user experience. To support such a neighbor network, 3GPP (3rd generation partnership project) has started a new research project in the fields of SA (service and system aspects) and RAN (radio access network). In these fields, public safety has been seen as a typical use case for supporting emergency communication scenarios.
However, when D2D communication is supported in a cellular network, if the cellular communication link and the D2D link operate in the same frequency band, serious interference will be caused, and such interference may be referred to as inter-layer interference (inter-layer interference). Inter-layer interference is considered a focus issue of current research in 3 GPP.
Fig. 1 is a schematic diagram illustrating an inter-layer interference scenario between a cellular communication link and a D2D link.
As shown in fig. 1, UE101, UE102 and UE103 are all in the coverage of a base station (NB/eNB, NodeB/evolvedNodeB) and are provided with mobile communication services, so the base station is the serving base station (serving NB/eNB) of UE101, UE102 and UE 103. Herein, a base station includes, but is not limited to, any base station that provides communication services for user equipments in its coverage, such as a macro base station (macro enb), a micro base station (micro enb), a femto base station (femto enb), and the like. For simplicity of explanation, the macro base station is used as an example only in this specification.
Wherein UE101 and UE102 are currently in D2D communication, both using uplink resources of the cellular system; the UE3 is currently in communication with a base station. For simplicity of illustration, the user device currently in D2D communication may be referred to as a D2D user device (D2 DUE); a user equipment currently in communication with a macro base station may be referred to as a macro user equipment (macro ue).
Examples of two types of interlayer interference shown in fig. 1 are as follows:
first type of interlayer interference
D2D user equipment may cause interference to cellular communications. For example, the D2D link may cause interference to the user equipment uplink to the eNB/NB. In fig. 1, D2DUE101 and D2DUE102 are sources of interference that generate such interlayer interference.
Second interlayer interference
The macro user equipment may cause interference to the D2D user equipment if it uses the same resources as the D2D user equipment. It should be noted that even if the macro user equipment uses adjacent resource blocks of the same subframe as the D2D user equipment, interference from the macro user equipment to the D2D user equipment still exists due to in-band radiation. In fig. 1, macro UE103 is an interferer that generates such interlayer interference.
Generally, the greater the transmit power of the user equipment, the greater the interference it generates; the smaller the transmit power of the user equipment, the less interference it generates. Thus, an adjustment to the transmit power of the user equipment may enable an adjustment to the interference generated by the user equipment.
Power control schemes have been defined in 3 GPP. For example, the user equipment may determine the transmit power based on the path loss measurement and the eNB configuration, as in equation 1 below:
Ptx＝min{Pmax,P0+α·PL+10log10(M) + f (t) } formula 1
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0a target signal-to-noise ratio representing a cell-specific (cell-specific) user equipment, provided by the eNB/NB;
α is a cell specific parameter provided by the eNB/NB;
PL represents the path loss from eNB/NB to the user equipment, which downlink loss is measured by the user equipment itself;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) a parameter indicating a closed-loop user equipment-specific (UE-specific) determined by the eNB/NB at each Transmission Time Interval (TTI);
Ptxrepresents the transmit power of the user equipment determined based on the above parameters, where PtxGet PmaxAnd P0+α·PL+10log10(M) + f (t) the smaller of these two values, whereby PtxNot exceeding P at maximummax。
Here, the power control scheme shown in equation 1 considers only the user equipment currently in communication with the base station, and does not consider the D2D user equipment currently in D2D communication. Therefore, the uplink power control method cannot be applied to a scenario in which there are a plurality of inter-layer interferences and also cannot be applied to a large interference fluctuation. This may not only result in significant uplink cellular performance loss, but may also be detrimental to D2D communication performance.
Disclosure of Invention
The invention aims to provide a method, a device and a system for determining transmission power for user equipment.
According to an aspect of the present invention, a method for determining transmission power at a user equipment is provided, wherein the method comprises:
-adjusting the transmission power of the user equipment based on the power related parameter set corresponding to the corresponding communication mode according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relative path loss of the user equipment at its current communication mode;
wherein the adjusting the transmit power of the user equipment further comprises:
-when the user equipment is currently in inter-device direct communication (D2D), adjusting the current transmit power of the user equipment in accordance with the likelihood of interference to cellular communication by the D2D communication;
-reducing the current transmit power of the user equipment when the user equipment is currently in cellular communication with the serving base station and multiplexing the same set of subframes with other user equipment in D2D communication.
According to another aspect of the present invention, there is also provided a method for assisting a user equipment in determining transmission power at a base station, wherein the method comprises:
-configuring a set of power related parameters corresponding to a current communication mode for each user equipment served by a base station according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relevant path loss of the user equipment at its current communication mode.
According to an aspect of the present invention, an apparatus for determining a transmit power at a user equipment is provided, wherein the apparatus is configured to:
-adjusting the transmission power of the user equipment based on the power related parameter set corresponding to the corresponding communication mode according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relative path loss of the user equipment at its current communication mode;
wherein the adjusting the transmit power of the user equipment further comprises:
-when the user equipment is currently in inter-device direct communication (D2D), adjusting the current transmit power of the user equipment in accordance with the likelihood of interference to cellular communication by the D2D communication;
-reducing the current transmit power of the user equipment when the user equipment is currently in cellular communication with the serving base station and multiplexing the same set of subframes with other user equipment in D2D communication.
According to another aspect of the present invention, there is also provided an apparatus for assisting a user equipment at a base station to determine a transmission power, wherein the apparatus is configured to:
-configuring a set of power related parameters corresponding to a current communication mode for each user equipment served by a base station according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relevant path loss of the user equipment at its current communication mode.
Compared with the prior art, the base station configures the power related parameter set corresponding to the current communication mode for the user equipment according to the current communication mode of each user equipment served by the base station, so that each user equipment adjusts the respective transmitting power according to the current communication mode and the corresponding power related parameter set. Specifically, when the user equipment is currently in D2D communication, according to the possibility of interference to the cellular link caused by the D2D communication, the current transmit power of the user equipment is adjusted, such as by reducing the current transmit power to reduce the interference to the uplink of the base station caused by the user equipment, or enhancing the current transmit power to improve D2D performance when the interference to the uplink is not or is small; when a user equipment is currently in communication with a base station and multiplexes the same subframe set with other user equipments in D2D communication, the current transmit power of the user equipment is configured to reduce interference to the D2D user equipment from the user equipment.
The invention provides an enhanced scheme for reducing interlayer interference to support D2D communication under a cellular network. The invention has at least the following advantages:
1) D2D communication is fully controlled and managed by the network through parameters configured by the base station, which is a main goal of 3 GPP.
2) Inter-layer interference between the cellular communication link and the D2D link is reduced.
According to a preferred embodiment of the present invention, through interaction between the base station and the ue, on one hand, when the first inter-layer interference probability generated by the ue to the base station is higher, for example, when the D2D ue is closer to the base station, the present invention can reduce the inter-layer interference generated by the D2D ue by reducing the transmission power; on the other hand, when the first inter-layer interference possibility generated by the ue to the base station is low, for example, when the D2D ue is far away from the base station, the present invention may further improve the D2D performance of the ue by adjusting the transmit power.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 shows a schematic diagram of an inter-layer interference scenario between a cellular communication link and a D2D communication link;
fig. 2 shows a flow chart of a method of determining transmit power for a user equipment according to one embodiment of the invention;
FIG. 3 illustrates a schematic diagram of an interlayer interference scenario in accordance with a preferred embodiment of the present invention;
fig. 4 shows a diagram for determining transmit power for a D2D user equipment in accordance with a preferred embodiment of the present invention;
fig. 5 shows a schematic diagram of a base station configuring different sets of power-related parameters based on whether a macro user equipment multiplexes the same set of subframes with other user equipments in D2D communication;
fig. 6 is a schematic diagram of an apparatus for determining transmit power for a user equipment by interworking in a base station and the user equipment according to another embodiment of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention proposes an enhanced scheme for determining transmit power for user equipment, which may be used to reduce inter-layer interference. Both types of inter-layer interference discussed above can be addressed.
Here, for simplicity of explanation, the present invention is only specifically designed as an example in the LTE system. It will be appreciated by those skilled in the art that the present invention is also applicable to other systems, such as ieee802.16m alike.
The present invention is described in further detail below with reference to the attached drawing figures.
Fig. 2 shows a flow chart of a method according to an embodiment of the invention, which particularly shows a procedure for determining a transmit power for a user equipment.
As shown in fig. 2, in step S201, the base station configures, for each ue, a power related parameter set corresponding to a current communication mode of the ue according to the current communication mode of each ue served by the base station; in step S202, each ue adjusts the transmit power of the ue according to its current communication mode based on the set of power-related parameters corresponding to the communication mode.
Specifically, in step S201, the base station configures, for each ue, a power related parameter set corresponding to a current communication mode of the ue according to the current communication mode of the ue served by the base station, where the power related parameter set at least includes the following parameters: 1) a target signal-to-noise ratio of the user equipment; 2) the weight of the relative path loss of the user equipment in its current communication mode.
Herein, the power-related parameter set includes, but is not limited to, various parameters related to the transmission power of the user equipment. In the subsequent steps, the power-related parameter set configured by the base station for the user equipment affects the transmission power of the user equipment, and further affects the inter-layer interference generated by the user equipment in the corresponding communication mode.
For example, the set of power-related parameters comprises at least the following parameters:
1) target signal-to-noise ratio of user equipment, e.g. with P0To indicate.
2) The weight of the associated path loss of the user equipment in its current communication mode is denoted as α.
Thus, a power-related parameter set may be available (P)0α).
The invention differs from the prior art in that: the prior art does not consider the relation between the current communication mode of the user equipment and the set of power related parameters. No matter which communication mode is currently adopted by the user equipment, the base station configures the same power related parameter set for the user equipment. In the invention, the base station can configure the power related parameter set corresponding to the current communication mode for the user equipment according to the current communication mode of the user equipment.
Specifically, the current communication mode of the user equipment includes, but is not limited to, any one of the following:
1) D2D.
Here, the target snr configured by the base station for the D2D ue may further be P0-D2DTo indicate that the weight of the second path loss of another D2D user equipment with which the D2D user equipment is in D2D communication may be further weighted by αD2DTo indicate.
2) The user equipment communicates with the base station and multiplexes the same set of subframes with other user equipment in D2D communication.
Herein, a user equipment communicating with a base station and multiplexing the same set of subframes with a D2D user equipment may be referred to as a cellular communication user equipment, such as macro UE103 in fig. 1. The target SNR configured by the base station for the cellular communication user equipment can be further P0-macroDenoted by, the weight of the first path loss of the cellular communications user equipment relative to the base station may be further denoted by αmacroDenoted by x.
3) The user equipment communicates with the base station but does not multiplex the same set of subframes with other user equipments in D2D communication.
Herein, a user equipment communicating with a base station but not multiplexing the same subframe set with a D2D user equipment may be referred to as a normal user equipment, which is not within the scope of the present invention since it does not generate inter-layer interference to the D2D user equipment. The target SNR configured by the base station for the common user equipment can be further P0-macroTo show that the weight of the first path loss of the ordinary user equipment relative to the base station can be further αmacroTo indicate.
In order to adjust the transmission power of the user equipment in each communication mode, a power related parameter set (P) corresponding to each communication mode is used0α) are different.
In step S202, each ue adjusts the transmit power of the ue according to its current communication mode based on the set of power-related parameters corresponding to the communication mode. Wherein, 1) when a user equipment is currently in D2D communication, the current transmit power of the D2D user equipment is adjusted according to the likelihood of interference to cellular communication by the D2D communication; 2) when a user equipment is currently in cellular communication with the base station and multiplexes the same subframe set with other user equipments in D2D communication, the current transmission power of the cellular communication user equipment is reduced.
Referring to fig. 3, UE301 and UE302 are currently in D2D communication, and the D2D communication interferes with the uplink of the base station. UE303 and UE304 are currently in cellular communication with a base station. Moreover, the macro UE303 is far away from the D2DUE301 and the D2DUE302, and may multiplex the same subframe set with the D2DUE301 and the D2DUE302, thereby generating interference to the D2D communication. The macro UE304 is closer to the D2DUE301 and the D2DUE302, and may not reuse the same subframe set with the D2DUE301 and the D2DUE302, so that it does not interfere with the D2D communication.
Here, it should be understood by those skilled in the art that the macro UE and the D2DUE are only relative concepts based on the current communication mode of the UE, and one UE is a D2DUE when communicating with D2D, and is a macro UE when communicating with the base station and multiplexing the same subframe set with other D2 DUE.
The configuration of the power-related parameter set and the adjustment of the transmit power are specifically discussed below with respect to different communication manners of the user equipment, respectively.
D2D communication
Here, when a user equipment is currently in D2D communication, the current transmit power of the D2D user equipment is adjusted according to the likelihood of interference to cellular communications by the D2D communication based on the set of power related parameters corresponding to the D2D communication.
According to a preferred example of the present invention, the likelihood of interference to cellular communications by D2D communications is determined by the set of power-related parameters (P) to which the D2D communications correspond0-D2D，αD2D) To be embodied. Accordingly, the current transmit power of the D2D user equipment can be determined by the following equation 2:
Ptx-D2D＝min{Pmax,P0-D2D+αD2D·PLD2D+10log10(M)+f(t)}
equation 2
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0-D2Da target signal-to-noise ratio, provided by the eNB/NB, representative of a cell-specific D2D user equipment;
PLD2Dindicating that the D2D user equipment is doing D2D relatively with itSecond path loss for another D2D user equipment communicating, note that for broadcast/multicast communications, PLD2DMay be pre-configured;
αD2Da weight representing a second path loss;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) represents closed-loop user equipment specific parameters determined by the eNB/NB at each TTI;
Ptx-D2Drepresents the transmit power of the D2D user equipment determined based on the above parameters, where Ptx-D2DGet PmaxAnd P0-D2D+αD2D·PLD2D+10log10(M) + f (t) the smaller of these two values, whereby Ptx-D2DNot exceeding P at maximummax。
In general, the base station configures the P for the D2D user equipment0-12DAnd αD2DThe value is low, so that the transmit power determined by the D2D user equipment is also relatively reduced. Therefore, the interference of the D2D user equipment to cellular communication is also relatively reduced.
According to another preferred example of the present invention, the set of power-related parameters for D2D communication includes a target signal-to-noise ratio P for the D2D user equipment0-D2DA weight α of a second path loss of the D2D user device relative to another D2D user device with which the D2D is in D2D communicationD2DAnd an interference weight ω of the D2D communication to the cellular communication. Accordingly, the current transmit power of the D2D user equipment can be determined by the following equation 3:
Ptx-D2D＝min{Pmax,ω·[P0-D2D+αD2D·PLD2D+10log10(M)+f(t)]}
equation 3
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0-D2Da target signal-to-noise ratio, provided by the eNB/NB, representative of a cell-specific D2D user equipment;
PLD2Dindicating a second path loss for this D2D user equipment with respect to another D2D user equipment with which it is in D2D communication, noting that for broadcast/multicast communication, PLD2DMay be pre-configured;
αD2Da weight representing a second path loss;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) represents closed-loop user equipment specific parameters determined by the eNB/NB at each TTI;
ω represents the interference weight of the D2D communication to the cellular communication;
Ptx-D2Drepresents the transmit power of the D2D user equipment determined based on the above parameters, where Ptx-D2DGet PmaxAnd ω. P0-D2D+αD2D·PL2D+10log10(M)+f(t)]The smaller of these two values, thus Ptx-D2DNot exceeding P at maximummax。
Preferably, ω is further divided, e.g. set to ω, according to the likelihood of D2D communication causing interference to cellular communication1And ω2And omega1<ω2。
When the D2D ue is likely to interfere with cellular communication, for example, the D2D ue is located near the bs, and if the current transmit power of the D2D ue is larger, the transmit power should be reduced, the D2D ue may adopt ω based on the above equation 31To adjust its current transmit power.
When the probability of interference to cellular communication by the D2D ues is small, such as the D2D ue is farther away from the bs, the current transmit power of the D2D ue can be increased if it is smaller, and the D2D ue can be increasedBased on the above formula 3 and using ω2To adjust its current transmit power.
Here, ω is1And ω2The assignment may be based on the distance of the D2D user equipment from the base station, e.g., using ω for D2D user equipment located at the edge of the serving cell of the base station2To adjust its current transmit power, using ω for D2D user equipments not located at the cell edge1To adjust its current transmit power.
Alternatively, ω is1And ω2The allocation may also be performed based on the second path loss of the D2D user equipment, for example, ω is adopted for the D2D user equipment with the larger second path loss2To adjust its current transmit power, and to adopt ω to the D2D user equipment with the smaller second path loss1To adjust its current transmit power.
Wherein, ω is1And ω2The value of (a) can take many forms. E.g. ω1<1，ω2>1. Also for example, 0<ω1<0.5，0.5<ω2<1。
Referring to fig. 4, D2DUE401 and D2DUE402 are closer to the base station, so that the transmission power of both is based on the above formula 3 and adopts ω1To adjust; the D2DUE403 and D2DUE404 are at the edge of the serving cell of the base station, so that the transmit power of both is based on equation 3 above and adopts ω2To adjust. Accordingly, the interference to the uplink from the D2DUE401 and D2DUE 402D 2D communication is reduced, while the interference to the uplink from D2DUE403 and D2DUE404 are low, so that both are allowed to use relatively high transmit power.
According to yet another preferred example of the present invention, the interference possibility of D2D communication to cellular communication can be further embodied by a difference between the first path loss of the D2D user equipment with respect to the base station and the average path loss of all user equipment of the base station.
Here, the power-related parameter sets corresponding to D2D communication are other than P0-D2DAnd αD2DAnd can also go intoOne step includes weighting the average path loss and its difference from the first path loss. Therefore, the D2D user equipment can adjust the current transmission power of the user equipment according to the difference between the first path loss and the average path loss and the weight of the difference, and the second path loss and the weight thereof.
In particular, D2D user equipment may be located in different locations and cause different levels of interference to the base station. Here, it is reasonable to assume that the D2D user equipment with a high probability of inter-layer interference to the base station should transmit relatively low power to meet the D2D communication requirements. Typically these D2D user equipments are located in the vicinity of the base station. In contrast, D2D user equipment with a lower likelihood of inter-layer interference to the base station allows transmission of relatively high power to support high D2D rates. Typically these D2D user equipments are located further from the base station. To address this problem, the following two cell-specific parameters are introduced to determine the transmit power of the D2D user equipment.
Parameter PLavgIs a cell specific parameter which represents the average pathloss of all user equipments in the base station, and parameter PLavgMay be semi-statically configured by the base station.
The parameter β is a cell specific parameter that represents a weight of the difference of the first path loss and the average path loss. The parameter beta may take a value less than or equal to 1, the parameter beta indicating that partial interference compensation is allowed.
These cell-specific parameters may be determined by the base station based on information of the interference environment, system load, etc.
Specifically, the D2D user equipment may determine the current transmit power based on equation 4 below: ptx-D2D＝min{Pmax,P0-D2D+αD2D·PLD2D+β(PLeNB-PLavg)+10log10(M)+f(t)}
Equation 4
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0-D2Da target signal-to-noise ratio, provided by the eNB/NB, representative of a cell-specific D2D user equipment;
PLD2Dindicating a second path loss for this D2D user equipment with respect to another D2D user equipment with which it is in D2D communication, noting that for broadcast/multicast communication, PLD2DMay be pre-configured;
αD2Da weight representing a second path loss;
PLeNBrepresents a first path loss from the eNB/NB to the D2D user equipment, the downlink loss being measured by the user equipment itself;
PLavgrepresents the average path loss of all user equipments served by the base station, which can be determined by the base station at the time of network deployment or optimization implementation based on the static network environment;
PLeNB-PLavgrepresenting a difference between the first path loss and the average path loss;
beta represents the weight of the difference value of the first path loss and the average path loss, and the beta can be used for partial interference compensation;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) represents the closed-loop user equipment specific parameters determined by the base station at each TTI;
Ptx-D2Drepresents the transmit power of the D2D user equipment determined based on the above parameters, where Ptx-D2DGet PmaxAnd P0-D2D+αD2D·PLD2D+β(PLeNB-PLavg)+10log10(M) + f (t) the smaller of these two values, whereby Ptx-D2DNot exceeding P at maximummax。
The above parameter P0-D2D、αD2D、PLavgβ are included in the power-related parameters corresponding to the D2D communicationsCollectively, the D2D user equipment is configured by the base station.
From the above equation 4, the following two points can be seen:
firstly, the method comprises the following steps: for D2D UEs that are closer to the base station, the first path loss of such D2D UEs relative to their serving base station is lower (i.e., has higher interference probability), PLeNB-PLavgIs a negative value, these D2D user equipments will therefore use a relatively low transmit power.
Secondly, the method comprises the following steps: for a D2D ue located closer to the base station, the first path loss of the D2D ue relative to its serving base station is higher (i.e., the generated inter-layer interference is lower), and the D2D ue may use a relatively high transmit power. This would be particularly beneficial for cell edge D2D user equipments, which are easily interfered by macro user equipments of neighboring cells D2D user equipments.
Communication with a base station
Referring to fig. 3 and 5, for a UE in cellular communication with a base station, it may reuse the same subframe set (in this case, a cellular communication UE) with other UEs in D2D communication (e.g., a macro UE 303), or may not reuse the same subframe set (in this case, a normal UE) with other UEs in D2D communication (e.g., a macro UE 304). For convenience of illustration, the present invention is illustrated below by way of example with macro UE303 and macro UE 304.
According to a preferred example of the present invention, the base station may configure the macro UE303 with, for example, a power related parameter set (P)0-macro，αmacroθ) to appropriately reduce its transmit power. Accordingly, the macro UE303 may adjust its transmit power by equation 5 below:
Ptx-macro＝min{Pmax,θ·[P0-macro+αmacro·PLeNB+10log10(M)+f(t)]}
equation 5
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0-macroa target signal-to-noise ratio, provided by the eNB/NB, representative of a cell-specific user equipment;
αmacrocell specific parameters provided for the eNB/NB;
the PLeNB represents a first path loss from the eNB/NB to the user equipment, the downlink loss being measured by the user equipment itself;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) represents closed-loop user equipment specific parameters determined by the eNB/NB at each TTI;
theta denotes a power adjustment weight for the cellular communication user equipment, theta < 1;
Ptx-macrorepresents the transmit power of the D2D user equipment determined based on the above parameters, where Ptx-macroGet PmaxAnd theta.p0-macroαmacro·PLeNB+10log10(M)+f(t)]The smaller of these two values, thus Ptx-macroNot exceeding P at maximummax。
According to another preferred example of the present invention, for the macro UE303 and the macro UE304, the base station configures different sets of power-related parameters (P) for the macro UE303 and the macro UE according to their respective current communication modes0α.) for example, the power-related parameter set of the macro UE304 is further configured as (P)0-macro,αmacro) The power-related parameter set of the macro UE303 is further configured as (P)0-macro*,αmacro*). Here, (P)0-macro*,αmacroMay also be (P)0-macro,αmacro) Denoted by x.
Here, in configuration (P)0-macro*,αmacroA and (P)0-macro,αmacro) Then, the base station may only beSetting different target signal-to-noise ratios, i.e. only P0-macroA and P0-macroOr, the base station may set only the weight of the first path loss of the different ue with respect to the base station, that is, only αmacroAnd αmacroDifferent; alternatively, the base station may set the target snr and the weight of the first path loss of the ue relative to the base station to be different.
For example, a macro user equipment that multiplexes the same subframe set with other user equipments at D2D may cause a second kind of inter-layer interference, while a macro user equipment that does not multiplex the same subframe set with other user equipments at D2D may not cause inter-layer interference. Thus, configured by the base station (P)0-macro*,αmacroOne) may be configured to a relatively small value. In particular, the base station may be configured with only a relatively small P0-macroAlternatively, the base station may be configured with only a relatively small αmacroA first step of; alternatively, the base station may also be configured with a relatively small P at the same time0-macroAnd αmacro*。
More specifically, (P)0-macro*,αmacroMay be less than (P)0-macro,αmacro). For example, P0-macro*<P0-macroAlternatively, αmacro*<αmacro(ii) a Or, P0-macro*<P0-macroAnd αmacro*<αmacro。
With the above configuration, in the subsequent steps, on the one hand, for a user equipment, such as the macro UE303, which is in communication with the base station and multiplexes the same subframe sets with other user equipments in communication with D2D, since its corresponding power-related parameter set is configured to be relatively small, the transmission power of the macro UE303 will be reduced, and its generated second inter-layer interference will be correspondingly reduced; on the other hand, for a user equipment, such as the macro UE304, that communicates with the base station but does not reuse the same set of subframes with other user equipments at D2D, its corresponding set of power-related parameters is unchanged from the prior art, and therefore, the transmit power of the macro UE304 will not be affected.
Referring to fig. 2, for a communication scheme in which a ue communicates with a base station and multiplexes the same subframe set with other ues in D2D communication, the base station configures the corresponding set of power related parameters for the ue in step S201, which includes but is not limited to the following 2 types:
1) semi-static configuration.
When semi-statically configured, the power related parameter set (P) corresponding to the communication mode0-macro,αmacro) Preconfigured by associating with the multiplexed set of subframes.
When semi-statically configured, the base station needs to indicate the set of subframes for D2D communication or non-D2D communication for the user equipment. Meanwhile, a power-related parameter set (P)0-macro,αmacro) May be preconfigured to be associated with the multiplexed set of subframes.
Returning to fig. 5, the base station may pre-configure multiple sets of power-related parameter sets, and one set of subframes may be associated with multiple sets of power-related parameter sets to support different communication manners of the user equipment when multiplexed. For example, for a multiplexed set of subframes, it should be associated with at least two sets of power-related parameter sets, such as (P)0-D2D，αD2D) And (P)0-macro,αmacro) For configuring D2D user equipment and cellular communications user equipment, respectively.
2) And (4) dynamic configuration.
When dynamically configured, the power-related parameter set (P) corresponding to the communication mode0-macro,αmacro) The index of the multiplexing subframe set is sent to the corresponding user equipment, such as the macro UE303, so that the macro UE303 queries the power related parameter set corresponding to each multiplexing subframe set according to the index.
When dynamically configured, the base station need not signal the D2D subframe set or the non-D2D subframe set. Therefore, the base station may inform the user equipment of only the set of power-related parameters. For example, an index of a set of predefined power-related parameter sets may be sent via PDCCH signaling to the user equipment communicating with the base station for it to query to determine the corresponding power-related parameter set when multiplexing the same set of subframes with other user equipments at D2D.
In particular, table 1 below shows an implementation example of parameter values including 4 indices:
| indexing | (P0-macro,αmacro)* |
| 0 | (P0-macro,αmacro)0 * |
| 1 | (P0-macro,αmacro)1 * |
| 2 | (P0-macro,αmacro)2 * |
| 3 | (P0-macro,αmacro)3 * |
TABLE 1
Those skilled in the art will appreciate that either an absolute value or an offset value may be used in the index.
Based on the power correlationParameter set (P)0-macro,αmacro) The transmit power of the cellular communication user equipment can be adjusted by the following equation 6:
Ptx-macro＝min{Pmax,P0-macro *+αmacro *·PLeNB+10log10(M)+f(t)}
equation 6
Wherein,
Pmaxrepresents a maximum transmit power of the user equipment;
P0-macro *a target signal-to-noise ratio, provided by the eNB/NB, representative of a cell-specific user equipment;
αmacro *cell specific parameters provided for the eNB/NB;
the PLeNB represents a first path loss from the eNB/NB to the user equipment, the downlink loss being measured by the user equipment itself;
m represents the bandwidth of the uplink resource allocation of the user equipment;
f (t) represents closed-loop user equipment specific parameters determined by the eNB/NB at each TTI;
Ptx-macrorepresents the transmit power of the D2D user equipment determined based on the above parameters, where Ptx-macroGet PmaxAnd P0-macro *+αmacro *·PLeNB+10log10(M) + f (t) the smaller of these two values, whereby Ptx-macroNot exceeding P at maximummax。
In summary, the base station may configure the power related parameter set corresponding to the current communication mode for each ue according to the current communication mode of each ue served by the base station. In the subsequent steps, each user equipment adjusts the respective transmitting power according to the current communication mode based on the power related parameter set corresponding to the corresponding communication mode. Due to the adjustment of the transmit power, the inter-layer interference generated by the user equipment may also be adjusted accordingly.
For example, if the current communication mode of a UE is D2D communication, the base station configures the D2D UE with a set of power related parameters (P)0-D2D，αD2D) Lower values may be taken. So that the first inter-layer interference generated by D2D user equipment (e.g., interference to the uplink from D2D communications) is reduced. Here, those skilled in the art should understand that the interference of D2D communication to cellular communication is not limited to the interference to the uplink of the base station, and the interference to the downlink of the base station to the user equipment will be generated when D2D communication uses downlink resources, so that the interference to the downlink can be reduced according to the present invention.
As another example, for a macro user equipment in communication with a base station, if the macro user equipment multiplexes the same subframe set with other user equipments in D2D communication, the macro user equipment will generate a second kind of inter-layer interference (i.e., its interference to D2D communication). Therefore, to solve the second problem of inter-layer interference, for two different communication modes, i.e. the user equipment communicating with the base station and multiplexing the same subframe set with other user equipment in D2D communication, and the user equipment communicating with the base station but not multiplexing the same subframe set with other user equipment in D2D communication, the base station can configure different power-related parameter sets for the two macro user equipments, such as (P) (i.e. (P))0-macro,αmacro) And (P)0-macro,αmacro). Preferably, due to the power-related parameter set (P)0-macro,αmacro) The value of x may be relatively low, and thus the transmit power determined by the user equipment based on the set of power related parameters is relatively reduced.
Here, the transmit power of the user equipment is reduced to a relative concept, i.e. the transmit power determined by the user equipment based on a smaller set of power related parameters is relatively smaller, since the set of power related parameters is relatively smaller. The transmit power of the user equipment is reduced is not an absolute concept, since the current transmit power of the user equipment depends not only on the power-related parameter set but also on other factors such as path loss.
The invention has the advantage that the power related parameter set corresponds to the current communication mode of the user equipment. Moreover, when the base station configures the set of power-related parameters, the base station may configure smaller power-related parameters for the D2D ue, the ue communicating with the base station and multiplexing the same subframe set with other ues in the D2D, so that the current transmit power finally determined by the corresponding ues is relatively reduced, and further, the inter-layer interference generated by the ues is reduced.
Fig. 6 is a schematic diagram of an apparatus according to an embodiment of the present invention, which particularly shows an apparatus for determining transmit power for a user equipment by interworking between a base station and the user equipment.
As shown in fig. 6, the base station 62 includes a parameter configuration device 620, and the user equipment 61 includes a power adjustment device 610. Specifically, the parameter configuration device 620 configures, for each ue, a power-related parameter set corresponding to a current communication mode of each ue according to the current communication mode of each ue served by the base station 62; accordingly, the power adjusting device 610 in each ue adjusts the transmit power of the ue according to the current communication mode of the ue and based on the power related parameter set corresponding to the communication mode.
Specifically, the parameter configuration device 620 configures, according to the current communication mode of each ue served by the base station 62, a power related parameter set corresponding to the current communication mode of each ue, where the power related parameter set at least includes the following parameters: 1) a target signal-to-noise ratio of the user equipment; 2) the weight of the relative path loss of the user equipment in its current communication mode.
Herein, the power-related parameter set includes, but is not limited to, various parameters related to the transmission power of the user equipment. In the subsequent steps, the power-related parameter set configured by the base station for the user equipment affects the transmission power of the user equipment, and further affects the inter-layer interference generated by the user equipment in the corresponding communication mode.
For example, the set of power-related parameters comprises at least the following parameters:
1) target signal-to-noise ratio of user equipment, e.g. with P0To indicate.
2) The weight of the associated path loss of the user equipment in its current communication mode is denoted as α.
Thus, a power-related parameter set may be available (P)0α).
Specifically, the current communication mode of the user equipment includes, but is not limited to, any one of the following:
1) D2D.
When the user device 61 is in D2D communication with another user device, the user device 61 is now a D2D user device.
Here, the target snr configured by the base station 62 for the D2D ue may further be P0-D2DTo indicate that the weight of the second path loss of the D2D user device relative to another D2D user device with which the D2D is in D2D communication may be further weighted by αD2DTo indicate.
2) The user equipment communicates with the base station and multiplexes the same set of subframes with other user equipment in D2D communication.
When the user equipment 61 is in communication with a base station and multiplexes the same set of subframes with D2D user equipment, the user equipment 61 may now be referred to as a cellular communication user equipment, such as the macro UE103 in fig. 1.
Here, the target SNR configured by the base station for the cellular communication user equipment can be further P0-macroDenoted by, the weight of the first path loss of the cellular communications user equipment relative to the base station may be further denoted by αmacroDenoted by x.
3) The user equipment communicates with the base station but does not multiplex the same set of subframes with other user equipments in D2D communication.
When the user equipment 61 is in communication with the base station but not multiplexing the same set of subframes with the D2D user equipment, the user equipment 61 may be referred to as normal user equipment, which is not within the scope of the discussion of the present invention since it does not generate inter-layer interference to the D2D user equipment.
In this case, the target snr configured by the base station for the normal ue can be further selected from P0-macroTo show that the weight of the first path loss of the ordinary user equipment relative to the base station can be further αmacroTo indicate.
In order to adjust the transmission power of the user equipment in each communication mode, a power related parameter set (P) corresponding to each communication mode is used0α) are different.
The power adjusting device 610 of each ue adjusts the transmit power of the ue according to the current communication mode of the ue and based on the power related parameter set corresponding to the communication mode. Wherein, 1) when a user equipment is currently in D2D communication, the power adjustment device 610 adjusts the current transmit power of the D2D user equipment according to the likelihood of interference to cellular communication by the D2D communication; 2) when a user equipment is currently in cellular communication with the base station and multiplexes the same subframe set with other user equipments in D2D communication, the power adjustment means 610 decreases the current transmit power of the cellular communication user equipment.
The configuration of the power-related parameter set and the adjustment of the transmit power are specifically discussed below with respect to different communication manners of the user equipment, respectively.
D2D communication
Here, when a ue is currently in D2D communication, the power adjustment device 610 adjusts the current transmit power of the D2D ue according to the likelihood of interference to cellular communication by the D2D communication based on the set of power-related parameters corresponding to the D2D communication.
According to a preferred example of the present invention, the likelihood of interference to cellular communications by D2D communications is determined by the set of power-related parameters (P) to which the D2D communications correspond0-D2D，αD2D) To be embodied. Accordingly, the power adjusting means 610 can determine the current transmission power of the D2D user equipment by the above formula 2.
According to another preferred example of the present invention, the set of power-related parameters for D2D communication includes a target signal-to-noise ratio P for the D2D user equipment0-D2DA weight α of a second path loss of the D2D user device relative to another D2D user device with which the D2D is in D2D communicationD2DAnd an interference weight ω of the D2D communication to the cellular communication. Accordingly, the power adjusting means 610 can determine the current transmission power of the D2D user equipment by the above formula 3.
According to yet another preferred example of the present invention, the interference possibility of D2D communication to cellular communication can be further embodied by a difference between the first path loss of the D2D user equipment with respect to the base station and the average path loss of all user equipment of the base station.
Here, the power-related parameter sets corresponding to D2D communication are other than P0-D2DAnd αD2DThe method may further comprise weighting the average path loss and its difference from the first path loss. Therefore, the power adjusting device 610 can adjust the current transmit power of the ue according to the difference between the first path loss and the average path loss and the weight of the difference, and the second path loss and the weight thereof by using the above equation 4.
Communication with a base station
According to a preferred example of the present invention, the parameter configuration means 620 of the base station 62 can configure the cellular communication user equipment with a power related parameter set (P)0-macro，αmacroθ) to appropriately reduce its transmit power. Accordingly, the power adjusting means 610 of the cellular communication user equipment can adjust the transmission power of the user equipment by the above equation 5.
According to another preferred example of the present invention, for cellular communication user equipment and general user equipment, the parameter configuration means 620 of the base station configures different power-related parameter sets (P) for the cellular communication user equipment and general user equipment according to their respective current communication modes0α.) for example, the power related parameter set of the ordinary user equipment is further configured to be (P)0-macro,αmacro) The set of power-related parameters of the cellular communication user equipment is further configured as (P)0-macro*,αmacro*). Here, (P)0-macro*,αmacroMay also be (P)0-macro,αmacro) Denoted by x.
The way for the parameter configuration means 620 of the base station 62 to configure the corresponding power-related parameter set for such a cellular communication user equipment includes, but is not limited to, the following 2:
1) semi-static configuration.
When semi-statically configured, the power related parameter set (P) corresponding to the communication mode0-macro,αmacro) Preconfigured by associating with the multiplexed set of subframes.
When semi-statically configured, the parameter configuration means 620 or other specific means in the base station 62 needs to indicate the set of subframes for the user equipment for either D2D communication or non-D2D communication. Meanwhile, a power-related parameter set (P)0-macro,αmacro) May be preconfigured to be associated with the multiplexed set of subframes.
Referring back to fig. 5, the parameter configuring means 620 of the base station 62 may pre-configure multiple sets of power-related parameter sets, and one set of subframes may be associated with multiple sets of power-related parameter sets to support different communication manners of the user equipment when multiplexed. For example, for a multiplexed set of subframes, it should be associated with at least two sets of power-related parameter sets, such as (P)0-D2D，αD2D) And (P)0-macro,αmacro) For configuring D2D user equipment and cellular communications user equipment, respectively.
2) And (4) dynamic configuration.
When dynamically configured, the power-related parameter set (P) corresponding to the communication mode0-macro,αmacro) The index of the multiplexing subframe set is sent to the cellular communication user equipment, so that the power adjustment device 610 of the cellular communication user equipment queries the power related parameter set corresponding to each multiplexing subframe set according to the index.
When dynamically configured, the parameter configuration device 620 or other particular device in the base station 62 need not signal the D2D subframe set or the non-D2D subframe set. Thus, the parameter configuration means 620 may only inform the user equipment of the power related parameter set. For example, an index of a set of predefined power-related parameter sets may be sent via PDCCH signaling to the user equipment communicating with the base station 62 for the power adjustment apparatus 610 therein to query the index to determine the corresponding power-related parameter set when it multiplexes the same subframe set with other user equipments at D2D.
Based on the above-mentioned power-related parameter set (P)0-macro,αmacro) The transmit power of the cellular communication user equipment may be adjusted by the power adjusting means 610 through the above equation 6.
It should be noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, as an Application Specific Integrated Circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
In addition, some of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions which invoke the methods of the present invention may be stored on a fixed or removable recording medium and/or transmitted via a data stream on a broadcast or other signal-bearing medium and/or stored within a working memory of a computer device operating in accordance with the program instructions. An embodiment according to the invention herein comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform a method and/or solution according to embodiments of the invention as described above.
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, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (15)
1. A method for determining transmission power at a User Equipment (UE), wherein the method comprises:
-adjusting the transmission power of the user equipment based on the power related parameter set corresponding to the corresponding communication mode according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relative path loss of the user equipment at its current communication mode;
wherein the adjusting the transmit power of the user equipment further comprises:
-when the user equipment is currently in inter-device direct communication (D2D), adjusting the current transmit power of the user equipment in accordance with the likelihood of interference to cellular communication by the D2D communication;
-reducing the current transmit power of the user equipment when the user equipment is currently in cellular communication with the serving base station and multiplexing the same set of subframes with other user equipment in D2D communication.
2. The method of claim 1, wherein, when the user equipment is currently in D2D communication, the associated path loss comprises a second path loss of the user equipment relative to another user equipment with which D2D communication is conducted.
3. The method of claim 2, wherein the associated path loss further comprises a first path loss of the user equipment with respect to its serving base station and an average path loss of all user equipments in the serving base station;
wherein the adjusting further comprises:
-adjusting the current transmit power of the user equipment in combination with the difference of the first path loss and the average path loss and the weight of the difference, and the second path loss and its weight.
4. The method of any of claims 1 to 3, wherein, when the user equipment is in cellular communication with the serving base station and multiplexes same set of subframes with other user equipment in D2D, the respective set of power related parameters is different from a corresponding set of power related parameters configured for when the user equipment is in cellular communication with the serving base station but does not multiplex the same set of subframes with other user equipment in D2D.
5. A method for assisting a user equipment in determining transmission power at a base station end, wherein the method comprises the following steps:
-configuring a set of power related parameters corresponding to a current communication mode for each user equipment served by a base station according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relevant path loss of the user equipment at its current communication mode.
6. The method of claim 5, wherein the current communication mode of the user equipment comprises any one of:
-direct inter-device communication (D2D);
-multiplexing the same set of subframes with the base station and with other user equipments in D2D communication;
-multiplexing the same set of subframes with the base station but without other user equipments in D2D communication.
7. The method of claim 5 or 6, wherein the current communication mode of the user equipment comprises multiplexing the same set of subframes with other user equipments in D2D communication and communicating with the base station;
wherein the configuration further comprises any one of:
-when semi-statically configured, the set of power related parameters corresponding to the current communication mode is pre-configured by being associated with the set of multiplexed subframes;
when dynamically configuring, the index of the power-related parameter set corresponding to the current communication mode is sent to the corresponding user equipment, so that the corresponding user equipment queries the power-related parameter set corresponding to each multiplexing subframe set according to the index.
8. An apparatus for determining a transmit power at a user equipment, wherein the apparatus is configured to:
-adjusting the transmission power of the user equipment based on the power related parameter set corresponding to the corresponding communication mode according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relative path loss of the user equipment at its current communication mode;
wherein the adjusting the transmit power of the user equipment further comprises:
-when the user equipment is currently in inter-device direct communication (D2D), adjusting the current transmit power of the user equipment in accordance with the likelihood of interference to cellular communication by the D2D communication;
-reducing the current transmit power of the user equipment when the user equipment is currently in cellular communication with the serving base station and multiplexing the same set of subframes with other user equipment in D2D communication.
9. The apparatus of claim 8, wherein, when the user equipment is currently in D2D communication, an associated path loss comprises a second path loss of the user equipment relative to another user equipment with which D2D communication is conducted.
10. The apparatus of claim 9, wherein the associated path loss further comprises a first path loss of the user equipment with respect to its serving base station and an average path loss of all user equipments in the serving base station;
wherein the adjusting further comprises:
-adjusting the current transmit power of the user equipment in combination with the difference of the first path loss and the average path loss and the weight of the difference, and the second path loss and its weight.
11. The apparatus of any of claims 8 to 10, wherein the respective sets of power-related parameters when the user equipment is in cellular communication with the serving base station and multiplexes the same set of subframes with other user equipment in D2D are different from corresponding sets of power-related parameters when the user equipment is in cellular communication with the serving base station but does not multiplex the same set of subframes with other user equipment in D2D.
12. An apparatus for assisting a user equipment in determining a transmission power at a base station, wherein the apparatus is configured to:
-configuring a set of power related parameters corresponding to a current communication mode for each user equipment served by a base station according to the current communication mode of the user equipment;
wherein the set of power-related parameters comprises at least the following parameters:
-a target signal-to-noise ratio of the user equipment;
-a weight of the relevant path loss of the user equipment at its current communication mode.
13. The apparatus of claim 12, wherein the current communication mode of the user equipment comprises any one of:
-direct inter-device communication (D2D);
-multiplexing the same set of subframes with the base station and with other user equipments in D2D communication;
-multiplexing the same set of subframes with the base station but without other user equipments in D2D communication.
14. The apparatus of claim 12 or 13, wherein the current communication mode of the user equipment comprises multiplexing the same set of subframes with other user equipments in D2D communication and communicating with the base station;
wherein the configuration further comprises any one of:
-when semi-statically configured, the set of power related parameters corresponding to the current communication mode is pre-configured by being associated with the set of multiplexed subframes;
when dynamically configuring, the index of the power-related parameter set corresponding to the current communication mode is sent to the corresponding user equipment, so that the corresponding user equipment queries the power-related parameter set corresponding to each multiplexing subframe set according to the index.
15. A system for determining a transmit power for a user equipment, wherein the system comprises the apparatus for determining a transmit power at a user equipment according to any one of claims 8 to 11 and the apparatus for assisting a user equipment in determining a transmit power at a base station according to any one of claims 12 to 14.
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