WO2021037639A1

WO2021037639A1 - Power control

Info

Publication number: WO2021037639A1
Application number: PCT/EP2020/073237
Authority: WO
Inventors: Thomas Fehrenbach; Cornelius Hellge; Thomas Wirth; Thomas Schierl; Sarun Selvanesan; Baris GÖKTEPE
Original assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date: 2019-08-23
Filing date: 2020-08-19
Publication date: 2021-03-04

Abstract

Method to perform power control on a transceiver of a member within a network comprising a plurality of members, comprising the following steps: determining the cast type of the network; and performing power control according to a groupcast approach for groupcast communication; and/or performing power control according to a broadcast approach for a broadcast communication; and/or performing power control according to a unicast approach for a unicast communication.

Description

Power Control

Description

Embodiments of the present invention refer to a method to perform power control and to user equipment(s) performing power control. Further embodiments refer to a base station, a system and a corresponding computer program for power control. Preferred embodiments cover power control for groups, power control for signaling combined with other measurement reports, power control for multi-carriers, as well as power split in joint resource pools.

Cellular communication standards support vehicular communications (V2X) in different flavors. V2X for 4G is also referred to as cellular V2X or LTE-V2X, for 5G, it is named cellular V2X or NR V2X. NR stands for New Radio, and is proposed as the upcoming 5G standard.

NR V2X supports unicast, groupcast (also referred to as “multicast”) and broadcast transmissions. NR V2X supports communication for UEs in-coverage, referred to as mode 1 , and UEs which are out-of-coverage, which is referred to as mode 2. This involves vehicular UEs communicating to network entities, which can be a base station (eNB, gNB, etc.) or a network entity designed for vehicular communications such as a road side unit (RSU). In another mode, UEs can communicate not only over a network but also in a direct mode, between two UEs, where one or both of them are vehicular UEs, as in a device- to-device (D2D) communication system.

V2X and in particular NR V2X supports the communication types unicast, groupcast and broadcast. Note, groupcast is also referred to as multicast in a different context, e.g. fixed networks.

The prior art describes some power control mechanisms. If a UE is in coverage of a base station (BS), uplink power control on the Uu-interface ensures that a UE chooses a transmit power for the different uplink physical channels and signals in such a way, that the BS can receive the signals at an appropriate power level. The appropriate power can be defined as the received power that is required for decoding of the information carried on the physical channel with a pre-defined packet- or bit-error rate (PER or BER), see also [1]. Power control in general is handling the following cases:

• Open-loop: the device estimates the uplink path loss based on downlink measurements and sets the transmit power accordingly,

• Closed-loop: control based on explicit power-control commands, based on prior measurements of the received uplink power, Beam-based power control, Power control for data channel (SCH) and/or control channel (CCH),

■ Power control in the case of multiple uplink carriers (carrier aggregation, dual connectivity, etc.).

The drawback of all solutions is that they are not optimal for the different operation modes like unicast, groupcast or broadcast. Therefore, there is a need for an improved approach. An objective of the present invention is to provide a concept for power control for the different operation modes unicast, groupcast, and broadcast. This objective is solved by four aspects. These aspects are defined by the subject-matter of the independent claims.

Embodiments according to a first aspect provide a method to perform power control on a transceiver of a member of a network or a group of the network (i.e. a member within the network) comprising plurality of members. The member can, for example, be a UE. The method comprises the four basic steps:

- determining the cast type of the network; and

- performing power control according to a groupcast approach for groupcast communication, an/or

- performing power control according to a broadcast approach for a broadcast communication; and/or

- performing power control according to a unicast approach for unicast communication.

Embodiments of this general aspect are based on the finding, that for different cast-types different power control mechanisms shall be chosen. Below, the three different approaches for the three different network types will be discussed.

An embodiment provides a method to perform power control according to a unicast approach. The method comprises the three steps: - performing a power measurement at a receiving member of the network, e.g., at a UE receiving data via a sidelink (this has a purpose to maintain a measurement value for the receiving member);

- reporting on the measurement value by use of a report message (this report is sent from the receiving member to the transmitting member a signal of which has been measured); and adapting a transmission power (at the transmitting member) based on the report message (at least for a subsequent transmission).

According to embodiments, the above-mentioned report message is exchanged using a sidelink interface, e.g. physical sidelink feedback channel or PSFCH. According to this embodiment, it is advantageous that by use of such a simple approach, the power control can be performed between the two network members communicating via a sidelink (unicast).

Another embodiment of this first aspect provides a method for power control according to a groupcast approach. Here, the first step is providing a power threshold or a power threshold range to one or more members of the network. This step may be performed by a UE, e.g., the group leader, or the base station. After that, a power measurement is performed at least at a first member of the network to obtain a measurement value of a given transmission for the first member. This first member reports by use of a report message, if the measurement value for the first member reaches the power threshold or if the measurement value for the first number exceeds the power threshold range. From another point of view this means that the report message is, for example, just sent if the previously defined power threshold values (value for the maximum and the minimum power) is reached or if the measurement value is out of the predetermined power threshold range. Based on this report message, an adaption of a transmission power (at least for a subsequent transmission) can be performed, e.g., by the transmitting member/transmitting UE (for example the group leader).

It is beneficial according to this groupcast approach that the power control approach is quite simple, since just the information that the transmission power is not idle is used for power control. According to an enhanced embodiment, the step of adapting is performed iteratively, e.g., until only one member or a certain number of members provide respective report messages. For example, just the members beings spaced apart from the transmitting member report that the power is too low, while the other members being closer to the transmitting members do not report, since from them the received power level is fine.

It should be noted that this power control method enables to adapt the power such that same is not too low and not too high, so that the step of adapting may comprise the step of increasing and/or decreasing the transmission power dependent on the respective report messages. In detail, increase of the transmission power is performed when the power message indicates a too low receive signal strength at the respective resuming member, while decrease of the transmission power is performed, when the report message indicates a too high received signal strength at the receiving member. Note, it is favorable that UEs transmit with less power. The reason for this is two-fold: first, the UE saves power while transmitting data which reduced the burden on its battery, secondly, the UE produces less interference to neighboring cells or UEs, which might have a simultaneous ongoing transmission.

Typically, the step of performing a power measurement and reporting on the power measurement is performed by different members. Therefore, according to an embodiment, the method comprises the step of performing power measurement and reporting at a second member. Alternatively, the step may also be performed by further members. Starting from the assumption that two members (first and second) perform the measurement then, according to embodiments, the step of adapting can comprise the step of selecting a measurement report of the first or second member, wherein the report message is selected of the member which has the request measurement value or which has the highest distance to the transmitting member or which has the highest path loss.

According to further embodiments, this measurement is just performed, when the minimum required communication range (MRCR) criterion is met. This embodiment enables advantageously that just members belonging to the respective group have influence to the power adaption.

As discussed above, according to embodiments, the power threshold or the power threshold ranges are provided by the network, a base station of the network, a group leader. Note, a group leader in general can be another UE, also referred to as GL-UE, which has additional group management capabilities to instruct or configure other UEs within reach. Alternatively, the thresholds may be predetermined for the respective network. Starting from the assumption that the base station or a network provides the threshold, the threshold or threshold ranges can be - according to embodiments - broadcasted using MIB or SIB. Also it may be possible that a broadcasting just the coverage range/coverage area is performed. Here, multicasting by use of beamforming, e.g., into a certain geographical area (e.g., in a close range using narrowband beam or in a far range using pencil beam, may be used). This enables that different thresholds for different distances or different portions of the group may be used.

Alternative or additionally the groupcast approach may be based on the following steps:

- providing a transmission power information on a transmission power which is set by a member of the group or the network or a group leader power threshold or a power threshold range to one or more members of the network; and adapting the transmission power based on the transmission power information.

According to embodiments, the broadcast approach comprises the following power control method steps:

- determining a first member of the network having the highest distance to the member of the network and/or having a highest path loss when compared to the other members of the network;

- performing a power management at the first member of the network to obtain a measurement value of a given transmission for the first member;

- reporting by use of a report message (sent by the first member) on the measurement value of the first member; and

- adapting a transmission power based on the report message of the first member (transmission power adaption at least for a subsequent transmission).

This concept is beneficial since due to the selection of the member having the first situation (highest distance or highest path loss) the adaption is performed, such that the received power suffices for the member having the worst situation.

According to embodiments, the situation can change, so that a second member can be used for performing the measurement according to which the adaption is performed. Therefore, another embodiment provides a method comprising the steps of determining, for performing and reporting performed by a second member, such that the step of adapting is performed based on the report of the second member, if the first member has moved such that the second member has the highest distance to the other members of the network or the highest path loss when compared to the other members.

Within the above embodiments, the report message comprises the information on a signal strength of the received signal at the receiving member, which, receives the signal via a sidelink (sidelink of the unicast mode, broadcast mode or multicast mode). This signal strength of the received signal enables a conclusion regarding the transmit power. To some embodiments, the report message may just comprise an information as to whether the received signal is sufficiently high and/or not too high.

According to this approach an initial transmission power and/or may be predetermined (e.g. by the network). Further the maximum transmit power may be limited.

According to an alternative approach instead of performing a power measurement or an initial power measurement (as described in context of the broadcast approach) the transmit power / initial transmit power may be determined based on a KPI (key performance indicator), like the channel busy ratio (CBR).

According to further embodiments the following information or at least one of the following information may be included by the report message:

- a received power;

- a path loss;

- a RSRP or RSSI or RSRQ, CQI, PMI, SNR, SINR, any other type of CSI or type of interference indication;

- a communication range;

- a required decrease of transmit power; a signal sequence indicating a predetermined decrease step;

- a required increase of transmit power;

- a single bit indicating increase or decrease;

- a signal sequence indicating a predetermined increase step;

- a signal sequence indicating a decrease or stay at the current level;

- a step size of increasing and/or decreasing.

Alternatively or additionally the report massage can comprise a timestamp, so that another BS/UE/GL-UE can interpret the validity of the measured value, e.g. it can neglect measurement values which are “too old”. The report message can also have additional data, e.g. position of UE, speed of UE, motion vector of UE, etc., which might aid a BS or GL-UE to instruct to use a certain power value or power threshold.

Within the above embodiments, the report message can be exchanged using a physical sidelink control channel. The above-mentioned information can be beneficial for other groups, e.g., neighboring groups, so according to further embodiments the report message may be sent or forwarded to other groups within the network. Nevertheless, the report message is not limited to be send via a sidelink control channel, but can also be signaled via uplink or downlink control channel (PUSCH, PDSCH) or relayed via PUSCH or PDSCH to another UE, e.g. as in forwarded when received via SL channel from the UE to a RSU or BS.

According to another aspect, the respective information, e.g., the report messages or the thresholds or the below discussed information on positions may be exchanged together with ACK/NACK signals used for the HARQ process. Alternatively, this information may be exchanged as discussed above using a physical sidelink feedback channel, a physical sidelink control channel, a physical sidelink shared channel or dynamic/semi-static channel.

It should be noted that the exchanging of information used for power control together with ACK/NACK signals may be performed independently from the above-discussed methods, i.e., together with other approaches.

According to embodiments, the adapting is performed by a transceiver of a transmitting member of the network.

All above discussed approaches are based on the measurement. According to further embodiments, also a calculation of the transmit power may be used. This calculation may be based on an information on the positions of the plurality of members. Therefore, this embodiment provides a method comprising the steps as providing a set of information on position of the plurality of members and determining a transmit power of the transmitting member dependent on the positions of the plurality of members and a position of the transmiting member. According to embodiments wherein the set of information can be forwarded by a member or a group leader and/or forwarded to a member out-of-coverage or not under the control of the network, e.g. can be a mode 2 UE which is in-coverage of a BS but is not in connected mode of the network. Note that this method may be performed in combination with the above-discussed power management approaches for the different cast types or independent from same.

Regarding this approach, the determination, whether the transmit power is sufficient for the respective UE at a respective position is performed at the transmitting UE. According to embodiments, the information based on which the determination is performed, i.e., the set of information on the position, e.g., a list of the different positions may be provided by a base station or a group leader of the network. This information may be directly received or forwarded, e.g., when a UE is out of coverage. Vice versa, according to embodiments, some information, e.g., on the positions of the members may be collected, e.g., if these members are out of coverage.

According to further embodiments, the set of information may not only comprise a static list, but also an information on the motion of members. Regarding the calculation, it should be noted that starting from the position a path loss between a position of the transmitting member and each position of the receiving members may be calculated enabling to determine the transmit power, such that same is sufficiently high for all members.

According to an alternative embodiment the base station / network can provide an information on an initial transmission power, a maximum or minimum transmission power or an adaption rate of the transmission power, etc. so that the adapting the transmit power of a transmitting member can be performed dependent on this information.

Note each of the above discussed above-discussed power management approach (groupcast approach, unicast approach or broadcast approach) can be used alone or in combination with another power management approach with the concept of selecting the respective approach dependent on the cast type.

Another embodiment provides a transceiver of a member, e.g., of a UE which is configured to perform one of the above-discussed approaches, especially performing the selection of the respective power management approach (groupcast approach, unicast approach or broadcast approach). A further embodiment provides a UE configured to perform one of these approaches. Here, the one UE may perform the measurement and the reports, preferably the receiving member, while another UE performs the adaption, preferably the transmitting member. Another embodiment provides a transceiver of a member which is configured to perform the transmit power determination based on a set of information on the position of the members within the network. Another embodiment provides a base station providing the set of information on the positions. A further embodiment provides a system comprising at least two UEs performing the power management or one UE and a base station which perform power management.

Another embodiment provides a method to perform power control, in case a one or more uplinks and one or more sidelinks is used at a UE. Here, the method comprises the steps:

- calculating an entire required transmit power for the transmitting member required for the one or more uplinks and for the one or more sidelinks; and

- adapting a transmission power based on the calculated entire transmit power.

Note, in case a UE performs simultaneous transmission using multiple beams, the power can also be split among beams in the same way as described above.

From another point of view this means that an approach is provided enabling to split the max TX power for multiple UL transmissions / multiple SL transmissions across multiple UL/SL bands or carriers. Note there might be a plurality of Uls (dual/multi-connectivity) and simultaneous SLs, when the power is flexibly split on the all active links.

For example, if the measurement value indicates a low received power for the sidelink, the transmit power for the sidelink at the transmitting member should be increased. However, since just a maximum amount of transmit power is available at the transmitting member, the transmit power for other channels, e.g., for the uplink could be reduced.

This method is based on the finding that considering the entire situation, i.e., the calculation of the required power for all channels, the resulting receive power at a receiving member (receiving the sidelink) and the maximum transmit power enables to improve the power management. Embodiments of this third aspect are beneficial since due to the overall approach, it can be ensured that the available transmit power is distributed optimally.

According to embodiments, the calculation is based on the formula P_SL = P_tot ~ P_UL , wherein P_SL is the power or sum power for the sidelink(s), P_tot is the power which can be transmitted by a transceiver and P_UL is the power or sum power for the uplink(s). Starting from this, according to embodiments the power for the uplink can be reduced when a required power for the sidelink is higher than an available power (for the sidelink) or when the measurement value indicates a low received power at the receiving member. Note that this approach/calculation may also be performed when a plurality of sidelinks are used. Typically, the measurement is performed at the receiving member, while the calculation is performed at the transmitting member. Therefore, another embodiment provides a transceiver of the respective member, namely a transceiver of the receiving member configured for performing the measurement and/or a transceiver of a transmitting member performing the calculation and/or the adaption. Another embodiment provides a respective system comprising at least these two members.

Another embodiment provides a method to perform power control when a joint resource pool for one or more uplinks and for one or more sidelinks is used. Here, a calculation may be performed again, e.g., at the transmitting member. The calculation enables to calculate the used power for the one or more uplinks and for the one or more sidelinks. The method comprises the step of optimizing a distribution of the transmit power considering one or more of the following factors: priority of data packets to be transmitted; the number of active transmit beams at a UE; distance between the transmitting member and a base station; distance between a transmitting member and a receiving member; receiving capability of the base station and a receiving member; interference caused by neighboring members; priority of the base station communication; priority of the sidelink resource pool; semi-persistent scheduled resources; and preconfigured resources; and/or preempted resources.

Embodiments of this aspect are based on the finding that different situations have an influence on the distribution of the available transmit power. For example, a priority of a sidelink or a one or more uplinks may be taken into account, when distributing the power. For example, the channel having a higher priority receives more transmit power than other channels. Due to this approach, it can be beneficially ensured that within the shared resource pool the resources are optimally distributed. According to embodiments, the step of optimizing comprising the step of using semi- persistent schedule resources for a sidelink or using semi-persistent schedule resources for the sidelink and adapting the transmit power for the sidelink. Furthermore, semi- persistent resources may be transferred to other members of the network. Here, the transmit power may be adapted again.

An embodiment of this aspect provides a user equipment having a transceiver which is configured to calculate the transmit power to be used and to optimize the distribution of the transmit power based on the above-discussed factors.

It should be noted that all above-discussed embodiments which have been described in context of a method may be computer implemented. Therefore, another embodiment provides a computer program having a program code for performing, when running on a computer one of the above methods/method steps.

Optional features of the above methods are defined by the dependent claims.

Embodiments of the present invention will subsequently be discussed referring to the enclosed figures, wherein

Figs. 1a-c show schematically three different power control approaches for different casting types according to embodiments;

Fig. 2a show a schematic block diagram for illustrating power control among group members of a UE group according to embodiments;

Fig. 2b schematically illustrates the path loss (PL) estimation for UE groups within coverage or out of coverage of base stations according to embodiments;

Fig. 2c schematically illustrates the use of different power classes coordinated by the group leader UE or a base station entity (e.g., gNB, RSU, etc.) according to embodiments;

Fig. 3 shows a schematic block diagram for illustrating the approach of power splitting in case of multiple carriers according to embodiments; and Fig. 4 shows a schematic block diagram illustrating a UE having ongoing SPS-UL transmission and decides or is configured to use a fourth/every fourth transmission resource of its SPS-cycIe for a SL transmission according to embodiments.

Below, embodiments of the present invention will subsequently be discussed referring to the enclosed figures, wherein identical reference numerals are provided to object-identical or similar function. Before discussing the embodiment, preferred scenarios of applications will be discussed. The embodiments refer to perform power control within the network having at least two members. These members can be configured to communicate via a sidelink. V2X, e.g., NR V2X is a typical application for the discussed approaches. For V2X, power control has to be handled in different cases: power control should be applied to the Uu interface, if the V2X-UE is transmitting in the uplink to the base station, and power control should be handled on the sidelink interface, e.g., PCS between UEs. Since a UE can operate in different cast types, power control algorithm can be optimized for the particular link (uplink, sidelink) and cast type (unicast, groupcast, broadcast) simultaneously. Power control for uplink transmission via PUSCH per carrier be described by

P_PUSCH = min{ P_CMAX, P₀ (j) + a (j) ^. PL(q) + 10 ^. log₁₀( 2^m · M_RB) + D_TF + d(l)} , where

• P_PUSCH is the PUSCH transmit power;

• P_CMAX is the maximum allowed transmit power per carrier;

• P₀(_j) is a network-configurable parameter that can, somewhat simplified, be described as a target received power;

• PL( _q) is an estimate of the uplink path loss;

• a (j) is a network-configurable parameter related to a fractional path-loss compensation;

• m relates to the subcarrier spacing D_f used for the PUSCH transmission. More specifically D_f = 2^{m .} 15 kHz ;

• M_RB is the number of resource blocks assigned for the PUSCH transmission;

• D_TF relates to the modulation scheme and channel-coding rate used for the PUSCH transmission; and

• d(l) is the power adjustment due to the closed-loop power control. Power control is carried out separately for each carrier, in case the UE is configured with multiple carriers. P_CMAX ensures that the transmit power does not exceed a maximum power threshold allowed in the given carrier. Note, the given transmit power in a device is limited, so that a given UE might not be able to transmit on multiple carriers with the maximum transmit power simultaneously. The reason for this is limited transmit power, and with this battery power, in a given UE, but also problems resulting with inter-modulation and crosstalk or cross-interference between neighboring frequency bands or harmonics.

This finding forms the basis for the below discussed embodiments. According to an embodiment of the first aspect, the entities of a communication network, i.e. , the UEs and/or the base station perform different power control approaches dependent on the respective cast type so as to cover power control for groups, power control signaling combined with other measurement reports, power control for multiple carriers, as well as power split into joint resource pools. According to a first embodiment, the chosen power control mechanism shall be configured dependent on the cast type. Therefore, the cast type is selected and one of the below discussed power control mechanism, preferred to V2X applications is used.

Fig. 1a shows exemplarily a network comprising at least two members, namely the user equipment 10t and the user equipment 12r. Optionally, the user equipment 10t and 12r may be in coverage of the base station 14. Both user equipments 10t and 12r communicate to each other using a sidelink (Note a sidelink is direct interface between two UEs, e.g. a PC5 or D2D interface). The user equipment 10t represents the transmitting user equipment (cf. transmit signal 20t). In order to transmit this signal 20t, the user equipment 20t sets or adjusts the correct transmission power. In order to find the correct transmission power, the following power control mechanism can be chosen transmission mode. The signal 20t is transmitted by the user equipment 10t to the user equipment 12r which performs a power measurement. The measurement value representing an information regarding the received signal can be given back to the transmitting user equipment 10t, e.g., by use of the physical sidelink feedback channel (PSFCH), as it is illustrated by the reference numeral 22f. Based on this measurement report the transmitting UE 10t can perform power control, e.g., by increasing the transmission power, if the receive signal has a too low power or by reducing the transmission power, if the receive signal has a too high power. Note, the measurement value corresponds to a particular transmission, and can vary for each transmission to the same member. Thus, the steps of performing, reporting and adapting are - according to embodiments - performed for at least two sidelinks separately.

This method represents the basic method for the power control from the sidelink, wherein enhancements are made for other cast types, like groupcasting or broadcasting.

Fig. 1b illustrates the groupcasting approach. Fig. 1b shows a network comprising at least the transmitting user equipment 10t, the first receiving user equipment 12r1 and the second receiving user equipment 12r2. These three user equipments 10t, 12r1 and 12r2 form a group, wherein, for example, the user equipment 12t is the group leader or at least a transmitting user equipment for which the transmission power has to be controlled. The network, here represented by the base station 14 or group leader (GL)-UE or another transmiter UE 10t provides a power threshold to the other members 12r1 and 12r2 of the group. Alternatively, the power threshold can be preconfigured. If provided by the network, a base station 14 (or gNB) could broadcast this information via MIB or SIB to all UEs 10t, 12r1 and 12r2 in a given area covered by the base station 14. Alternatively, the base station or gNB can broadcast or multicast this information also using a beamformer, in order to send or direct this information into the geographical area of a given group or depending on the used frequency, point this request directly to the UE 12r2 which is farthest away from a given group. The latter can be achieved by using a very narrow beam and might be configured to be transmitted a very high center frequency, e.g., a frequency within the FR2 range, e.g. 28 GHz or 60 GHz, to form a narrow beam such as a pencil beam or to limit interference to other UEs within the vicinity.

The UE 10t transmits its transmission signal 20t to the receiving user equipment 12r1 and 12r2. The UEs 12r1 and 12r2 can perform a power measurement. As a result of this, the UE 12r1 and 12r2 provides a power control measurement report (cf. reference numeral 22f) only if the measurement value is above or below the predefined (broadcasted) threshold, which can be based on e.g., a L1-RSRP (Layer-1 -RSRP), a L3-filitered RSRP (Layer-3- RSRP), RSRQ, SINR, SIR, RSSI, a single bit indicating too low or too high transmit power, a geographical distance in meter, etc..

When starting from the assumption that the transmit power is too low, it is not uncommon, when just the UE 12r2 which is the farthest away receiving UE 12r just reports about a too low receive signal. Within the next step, the group leader or the transmitting UE 10t can adapt their transmission power based on these reports, e.g., increasing or decreasing or staying with the current transmission power. Of course, this can also be done by other group member UEs.

According to further embodiments, this approach can be further optimized by applying one of the following methods:

According to embodiments, the above-discussed threshold can be adapted, so that only the “worst UE”, here the UE 12r2, namely the UE which is farthest away from the group provides feedback data for power control.

According to embodiments, the transmitter UE 10t adjusts the transmit power iteratively, such that only single UE, i.e., the UE with the highest path loss, is reporting. For example, the transmitter UE 10t detects/receives the prior reporting or a single bit indicating too low (or too high) transmit power. In response of detecting more than one report, the transmitter 10t increases (or decreases) the transmit power which results in less UE reporting. This procedure can be continued until only one single or a fixed number, k, UEs are reporting.

According to a further embodiment, it is possible to couple the reporting to a minimum required communication range (MRCR). The UE 12r1 and 12r2 not only applies the threshold criterion to decide on whether to report or not, but also use the MRCR criterion, e.g., not reporting if too far away although the power criterion. Hence, the UE 12r1 report only if the power threshold and the MRCR criterion are met. Exemplary scenario: if a UE of the group is about to leave the group, e.g., the MRCR increases, it does not provide feedback anymore, but leaves it up to the "second worst” to report feedback information.

This can be further coupled with other available sensor data, e.g., if the route data of a UE, or its position (e.g., GPS) and/or accelerator and/or direction data of a said UE is available.

Regarding the signaling aspects of the power reporting: the receiver UEs 12r1 and 12r2 report at least one of the following: received power, path loss, a RSRP or RSSI or RSRQ, CQI, PMI, SNR, SINR, any other type of CSI or type of interference indication; a communication range; a required decrease of transmit power; a signal sequence indicating a predetermined decrease step; required increase of transmit power, e.g. INCREASE BY X dBm, where X is dynamically configured or pre-configured, single-bit indicating increase or decrease, e.g. 0 -> decrease or stay, 1 -> increase, signal sequence, e.g. DMRS, where the detection of the sequence indicates an increase by X dBm and the absence means decrease or stay at the same level.

Note, the step size of an increase/decrease value can be pre-configured or send by another apparatus, e.g. base station, GL-UE, road side unit, and configured via unicast, multicast or broadcast.

Note the signaling can take place either on the physical sidelink (SL) control channel (PSCCH) or any other dedicated power signaling mechanism. The signal sequence option does not require a set of orthogonal resources, but all received UEs 12r1 and 12r2 can share the same resource for transmission of the power report. This resource may be a PSFCH resource and a PSFCH format zero-based approach may be used.

According to further embodiments, the group member UEs 12r1, 12r2 can signal to other group member UE and provide power control data to instruct a given UE to increase or decrease transmit power by x dBm or by a pre-defined value providing at least 1-bit feedback (or x-bit) by signaling the increase/decrease as well as a step size. This can be done in order to reduce interference among group members or interference to UEs / BSs outside the group.

Below, with respect to Fig. 1c, a broadcast approach for power controlling will be discussed. Fig. 1c shows the user equipments 10t (transmitting user equipment) as well as the receiving user equipment 12r1 to 12r3. Optionally, the network may comprise a base station 14.

The transmitting user equipments 10t transmits via the sidelink 20t data to the three user equipments 12r1 to 12r3 or to all user equipments which can be reached. For example, the transmit power can be a maximum power, set to a threshold or set to a power limit for set resource pool (RP).

Here, three user equipments 12r1 to 12r3 are somewhere around the transmitting user equipment 12t which transmits the signal 20t. Power management within the broadcast mode enable to save energy wherein it should be ensured that all possible user equipments can receive the data 22t. For the broadcasting the transmit power management can be also report-based. In order to avoid that each user equipment reports on the power measurement, one user equipment, e.g., the user equipment having the largest path loss/ highest distance/or worst interference condition is selected as user equipment providing the measurement reports, such that the user equipment 10t can adjust its transmit power. Here, the UE 12r3 may be selected or instructed to provide the measurement reports, since it has the highest distance to the transmitter 10t. This report message is marked by the reference numeral 22f.

With respect to Fig. 2a, a possible scenario for broadcasting will be discussed in detail. A UE group T comprising UEs i, j, and m which are communicating between each other on the sidelink interface.

UEm is the UE which defines the transmit power, since it has the largest path loss / distance / or worst interference condition when compared to the other UEs i, k or j. If UE_m moves closer to the other group members, another group member can take over the responsibility to provide power control feedback to other group member UEs. Note, also groups which are within reach of one another can cause interference. Thus, individual group members could report interference levels to the associated UE group leader (GL-UE) or base station, which then negotiates transmit power thresholds between the groups or GL-UEs, or centrally optimizes power thresholds in the network, which is then again configured in the particular group of UEs.

In another embodiment, if the UEs which are in the process of communicating via SL are in coverage of a base station, and the base station is aware of the individual UE positions, the BS can unicast/groupcast/broadcast a list of UE IDs with their corresponding positions to the transceiver UE or a possible GL-UE.

This approach may be used for all above broadcasting types (unicast, multicast or broadcast) or independently from the casting type. For example, the transceiver UE or the transmitter UE 10t can use its own location as well as the other UE positions, e.g., of the UEs 12r1 and 12r2 to adapt its transmission power. For example, if the transmitter UE is not the GL-UE, but the GL-UE receive GPS values from the base station 14, the GL-UE can relay this information to the transmitter UE belonging to the group using unicast/groupcast/broadcast.

The position can be a GPS coordinate, or a GPS coordinate combined with a motion vector, indicating the direction of movement of a particular UE. In this way, the transmitter UE can estimate or predict future UE positions and adapt its transmit power once it gets channel access accordingly. The power control algorithm can be open loop power control (OLPC) with the calculated path loss component weighted by the UE which is farthest away from the group. In this way, the UE transmitter avoids to use maximum power for transmission, and thus reduced interference to neighboring UEs transmitting in UL or SL direction.

According to embodiments, the path loss (PL) component used to calculate the transmit power for the transmitter UE, UETX, can be the max. path loss component taken from the PL between UE and base station, PL_UE-gNB, if the UE is in coverage of a base station. If the UE is out-of-coverage, the max. PL between and transmitter UE, UE_TX, and receiver UE, UERX, shall be used, PL_TXUE-RXUE. Note, if PL_TXUE-RXUE > PL_UE-gNB and the PL_UE-gNB is chosen, there can be cases that the transmitter UE cannot reach the receiver UE. In certain cases, if in-coverage the UE should be limited to take the PL_UE-gNB into account, to reduce the interference power to other UEs and base stations.

With respect to Fig. 2b another embodiment will be discussed. If the UEs are out of coverage (of. group O) the transmitter UE_M can collect GPS coordinates from the other UEs UE_q, UE_r, UE_n in its vicinity, which are broadcasting messages, e.g., Cooperative Awareness Messages (CAM) containing location-based information. This information can be used by the given the UE in its path calculation which is then used for the OLPC.

Fig. 2c shows the group t comprising the UEs UE_m, UEi, UE_j and UE_k. Furthermore, within the network a base station 14 may be present. As can be seen, different ranges around the transmitting UE_m are illustrated (cf. reference numeral 26s, 26m and 26I). For example, the transmitter UE, UE_m, which can be in-coverage or out-of-coverage adjust its transmit power to the MRCR. In one embodiment, it might use low power to reach receiver UEs in close vicinity, it might use medium transmit power to reach all members of a UE group, it might use high transmit power to reach a base station or RSU. The transmitter UE power can be scaled by the network or GL-UE to reduce interference towards other network elements (UEs, base stations, RSUs, etc.). This can involve signaling of power thresholds from the network to a UE, or from the network to a GL-UE, or from the GL-UE to associated UE group members.

In context of the above embodiments, the report message has been discussed in context of being sent using a physical sideiink control channel or a comparable channel. According to further embodiments, the HARQ feedback and the power control can be combined. For example, the report messages or other information exchanged for the power control may be exchanged together with the HARQ-ACKs/NACKs. For example, in unicast or groupcast, if HARQ is enabled, allow piggybacking power control data with HARQ-ACKs/NACKs. Either allow to simply signal to the transmitter that it should increase / decrease the transmit power on the next transmission by a pre-defined power, or signal the change directly, e.g. increase transmit power by 3 dBm. Also allow to signal a transmit power reset to the given UE, so that the UE will use the originally defined transmit power which was pre-configured or configured for this network or resource pool.

PSFCH determination: The PSFCH or PSSCH resource which is meant for transmitting HARQ-ACK and power control data together is indicated either dynamically or configured semi-statically. Dynamic indication may be transmitted in the PSCCH region in an SCI, where the same PSFCH resource indicated for the HARQ for this transmission scheduled in the PSCCH may be reinterpreted also for power control data.

Furthermore, SL power control can also involve indirect signalling, meaning if the transmitting UE receives a number of NACKs (one, more or a certain number), it can increase its transmit power by an agreed dBm number, such that the k-th repetition of the packet is power boosted. Such a power-boosting rule could be configured via broadcast, groupcast or unicast, by a BS or by a GL-UE or a normal UE.

Semi-static configuration is either done by the network or by the group leader, e.g. GL-UE, configured/negotiated by the initiating device. The semi-static configuration may include a periodicity which identifies the PSFCH resources to be used for power control data transmission and where the periodicity may be based on the PSFCH periodicity, a PSFCH resource indicator, and a time offset indicating the starting position within the indicated period. With respect to Fig. 3 another embodiment will be discussed. Here, a network is shown which comprises the transmitting UE 10t, the receiving UEs 12r1 and 12r2 as well as a base station 14. As illustrated by the arrow 22t, the transmitting UE 10t performs sidelink communication to the one or more receiving UEs 12r1 and 12r2. Additionally, the UE 10t has an uplink to the base station 14 (cf. arrow 22u). This approach may preferably, but not necessarily be used, when the sidelinks 22t and the uplinks 22u use multiple carriers.

If a UE 10t is connected over more than one interface, the UE 10t splits its transmit power over said interfaces accordingly. The UE 10t can be connected via a Uu 22u and sidelink (SL) 22t, several Uu-interfaces (dual/multi-connectivity) or several SL interfaces (not shown). In case of V2X, the UE can optionally split its transmit power if it simultaneous ongoing unicast and groupcast, or multicast and broadcast, or groupcast and broadcast transmission. Furthermore, in case of dual/multi-connectivity the UE 10t can splits its power and increase its transmit power on the master node (or main carrier) and, transmit with reduced power on the secondary node.

If the transmitter UE is in mode 1 (connected to a base station) and has measured the sidelink (SL) path loss (PL), it can report the PL values or the remaining transmit power to its primary base station. The base station can then in return calculate the optimal power allocation and signal to the UE how to distribute its transmit power among the possible UL and/or SL carriers according to:

P_SL = P_tot - P_UL.

If the SL power is too low but the BS wants to force the UE to transmit its data in the SL, it can signal to the UE to skip its UL transmission via DCI or RRC signaling. This would allow the UE to use its transmit power on the SL without power splitting. Furthermore, the BS could instruct the UE to only skip UL data (PUSCH) or UL control traffic (PSCCH) if the power budget allows. If the UE wants to transmit data on several SL interfaces simultaneously, the BS can optimize the power budget for the UEs SL, since it might have more precise information on the actual UE positions available, and thus instruct the UE to use a certain transmit power on a particular SL communication. Optionally, the BS can just send a set of power adjustment values to the given UE. Furthermore, the BS can also be a RSU or a GL-UE or just another UE. According to another embodiment, a method to perform power control in case of resource allocation/power split in joint resource pools is provided.

The situation is the same as illustrated by Fig. 3, wherein the resource pool used for the UE 10t has joint resources for an uplink (UL) transmission 22u as well as resources which can be used for the sidelink transmission 22t.

This is beneficial if there are only limited UEs using the SL interface in a given area, e.g. only a limited number of V2X-UEs but also a number of eMBB-UEs in that given area. To avoid wastage of resources, shared resource pools can be introduced which allow simultaneous UL and SL (UL-SL) transmission in the same resource pool. Note, it is also possible that a UE has simultaneous ongoing SL transmissions in the same resource pool but to more than one UE, e.g. to two different UEs. This can be denoted as SL-SL transmission.

If a given UE has to carry out simultaneous UL-SL or SL-SL transmissions, the maximum transmit power has to be divided for enabling both these transmissions. The amount of power divided for each transmission can be ascertained by the following criteria:

• Priority of the packet to be transmitted,

• Distance between the TX UE and the gNB (for UL) and distance between the TX UE and the RX UE (for SL),

• Receiving capability of gNB (for UL) and UE (for SL),

• Interference caused to neighbouring UEs (if the RX UE is part of a group),

• Prioritize Uu interface, i.e. use transmit power assigned by the gNB and allocate remaining power for SL,

• Priority of the SL resource pool.

According to another embodiment, the transmit power in shared UL-SL or SL-SL resource pools shall be optimized. Such a resource pool is illustrated by Fig. 4. Fig. 4 shows a resource pool 28 having a frequency dimension 28f and a time dimension 28t. Within the entire set of resources, some resources are dedicated for the uplink and the sidelink. This portion is marked by 28ulsl. Here, some UL SPS resources 28s are marked, wherein a resource in between in a so-called pre-empt resource which is used for the sidelink. This resource is marked by 28p. E.g., if a UE has an ongoing semi-persistent schedule (SPS) transmission on the Uu interface in the uplink (Uu), the UE can decide to use its SPS resources 28s in regular intervals also for the use for the sidelink (SL) transmission for a sidelink unicast, sidelink groupcast or sidelink broadcast transmission. In this way it can be beneficial, that the UE adapts the transmit power for the sidelink resource 28p according to a preconfigured or previously signaled SL-transmit power of another UE. For example, it can reduce the transmit power to 3 dB to avoid transmitting with too much power on a SL resource.

In another embodiment, the UL resources described above can also be SL resource on a SL to a different UE. In this way, the UE can have a SPS SL transmission going on to another UE or group of UEs, and pre-empt this resource in order to have a one-shot transmission which can also be unicast/groupcast/broadcast to another UE or set of UEs. Furthermore, it can also pre-empt its SPS transmission and give this pre-empted resource to another UE in the given group, which then transmits according to the agreed power threshold in the given group. Furthermore, the pre-empted resource can also be a set of resources, which are pre-empted according to a pre-configured or signalled pre-emption pattern.

Note other scenarios can benefit of the described mechanism. Here, the following are to be mentioned:

• Networks with Internet-of-Things (loT) devices,

• Narrowband loT (NB-loT) systems with limited power source, which use D2D for relaying information to another device,

• NR-Light systems, which support a smaller bandwidth, e.g. 1 MHz, and thus require D2D to deliver data rates to another device or core network,

• Industrial loT (HOT) networks which support D2D communications,

• Public protection disaster relief (PPDR)-systems, which use D2D for communication or as range extension,

• Networks involving flying BS or UEs, such as airplanes, drones or non-terrestrial networks (NTN), operating under special power constraints which need to increase the power spectral density in the DL to reach UEs, as well as configure UEs in the uplink such data from a UE with limited transmit power can received.

Note in above embodiments, different types of base stations can be used, for example, a mobile or immobile base station. These base stations may be may comprise one or more of a macro cell base station, a small cell base station, a central unit of a base station, a distributed unit of a base station, a road side unit, a UE, a group leader (GL) or GL-UE, a relay, a remote radio head (RHH), an AMF, an SMF, a WiFi access point, a core network entity, a mobile edge computing entity, a network slice as in the NR or 5G core context, and any transmission/reception point, TRP, enabling an item or a device to communicate using the wireless communication network, the item or device being provided with network connectivity to communicate using the wireless communication network.

Regarding the above discussed UEs should be noted that embodiments are not limited to conventional UE but relate, without limitation to other types of transmitters or transceivers, e.g., a transceiver included by at least one of a user equipment; a mobile or immobile base station, a mobile terminal, a stationary terminal, a cellular loT-UE,

- a vehicular UE,

- a group leader UE (GL), an loT or narrowband loT, NB-loT, device, a ground based vehicle, an aerial vehicle, a drone, a moving base station, a road side unit (RSU), a roadside furniture, e.g. street lamp, a building, and any other item or device provided with network connectivity enabling the item/device to communicate using the wireless communication network, e.g., a sensor or actuator.

Thus, according to further embodiments, an UE may be a conventional user equipment, a mobile or immobile base station, a mobile terminal, a stationary terminal, a cellular loT-UE, a vehicular UE, a group leader UE (GL), an loT or narrowband loT, NB-loT, device, a ground based vehicle, an aerial vehicle, a drone, a moving base station, a road side unit (RSU), a part of a building or any other item or device provided with network connectivity enabling the item/device to communicate using the wireless communication network, e.g., a sensor or actuator.

Although above embodiments have been discussed in context of a method, the singular method steps are typically performed by entities, like the transmitting UE or the receiving UE or the base station. Therefore, further embodiments refer to the UEs performing one of the above steps, e.g., performing the power measurement or adapting the transmit power based on one of the above-discussed approaches.

Although some aspects have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus. Some or all of the method steps may be executed by (or using) a hardware apparatus, like for example, a microprocessor, a programmable computer or an electronic circuit. In some embodiments, some one or more of the most important method steps may be executed by such an apparatus.

Depending on certain implementation requirements, embodiments of the invention can be implemented in hardware or in software. The implementation can be performed using a digital storage medium, for example a floppy disk, a DVD, a Blu-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate (or are capable of cooperating) with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable. Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.

Generally, embodiments of the present invention can be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer. The program code may for example be stored on a machine readable carrier.

Other embodiments comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier.

In other words, an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.

A further embodiment of the inventive methods is, therefore, a data carrier (or a digital storage medium, or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein. The data carrier, the digital storage medium or the recorded medium are typically tangible and/or nontransitionary.

A further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet.

A further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein.

A further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.

A further embodiment according to the invention comprises an apparatus or a system configured to transfer (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver. The receiver may, for example, be a computer, a mobile device, a memory device or the like. The apparatus or system may, for example, comprise a file server for transferring the computer program to the receiver.

In some embodiments, a programmable logic device (for example a field programmable gate array) may be used to perform some or all of the functionalities of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein. Generally, the methods are preferably performed by any hardware apparatus.

The above described embodiments are merely illustrative for the principles of the present invention. It is understood that modifications and variations of the arrangements and the details described herein will be apparent to others skilled in the art. It is the intent, therefore, to be limited only by the scope of the impending patent claims and not by the specific details presented by way of description and explanation of the embodiments herein.

Akronvms

NAME DESCRIPTION

BS Base station, which can be a gNB in NR or eNB in LTE

L1 Layer-1

L3 Layer-3

MRCR Minimum required communication range

RSRP Reference signal received power

RSRQ Reference signal received quality

RSSI Received signal strength indicator

RSU Road side unit

SINR Signal to Interference and Noise Ratio

SIR Signal to Interference Ratio

UE User equipment

References

[1] E. Dahlmann, S, Parkvall, J. Sköld, “5G NR The Next Generation Wireless Access Technology”, Elsevier Academic Press, 2018.

[2] R1 -1906598, Huawei, HiSilicon, “Power control and power sharing for V2X sidelink”, 3GPP TSG RAN WG1 Meeting #97, Reno, USA, May 13-17, 2019.

[3] R1 -1906941, Samsung, “On Physical Layer Procedures for NR V2X”, 3GPP TSG RAN WG1 Meeting #97, Reno, USA, May 13-17, 2019.

[4] R1 -1906950, Samsung, “On Sidelink Power Control”, 3GPP TSG RAN WG1 Meeting #97, Reno, USA, May 13-17, 2019. [5] R1 -1906079, Nokia, “Discussion of physical layer procedures for sidelink”, 3GPP

TSG RAN WG1 Meeting #97, Reno, USA, May 13-17, 2019.

[6] R1 -1907143, Ericsson, “PHY layer procedures for sidelink”, 3GPP TSG RAN WG1

Meeting #97, Reno, USA, May 13-17, 2019.

Claims

1. Method to perform power control on a transceiver(10t) of a member within a network comprising of a plurality of members, comprising the following steps: determining the cast type of the network; and performing power control according to a groupcast approach for groupcast communication; and/or performing power control according to a broadcast approach for a broadcast communication; and/or performing power control according to a unicast approach for unicast communication.

2. User equipment (UE) configured to communicate within an network comprising a plurality of members, wherein the user equipment (UE) comprises a transceiver (10t) configured to perform power control according to a groupcast approach for a network supporting groupcast communication, and/or to perform power control according to a broadcast approach for a network supporting a broadcast communication, and/or to perform power control according to a unicast approach for a network supporting unicast communication; wherein the transceiver (10t) is configured to determine the cast type of the network in order to select a power control approach.

3. Method to perform power control on a transceiver (10t) of a member within a network comprising a plurality of members according to an unicast approach, the method comprising the steps: performing a power measurement at a receiving member (10r, 10r1 , 10r2, 10r3) of the network to obtain a measurement value of a given transmission for the transmitting member (10r, 10r1, 10r2, 10r3); reporting on the measurement value by use of a report message (22f); and adapting a transmission power based on the report message (22f).

4. Method according to claim 3, wherein the steps of performing, reporting and adapting are performed for at least two sidelinks or wherein the steps of performing, reporting and adapting are performed separately for at least two sidelinks.

5. Method to perform power control on a transceiver (10t) of a member within a network comprising a plurality of members according to a groupcast approach, the method comprising the steps: providing a power threshold or a power threshold range to one or more members of the network: performing a power measurement at least at a first member (12r1) of the network to obtain a measurement value of a given transmission for the first member (12r1); reporting by use of a report message (22f) if the measurement value for the first member (12r1 ) reaches the power threshold or if the measurement value for the first member (12r1) exceeds the power threshold range; and adapting a transmission power based on the report message (22f)

6. The Method according to claim 5, wherein the step of adapting is performed by a group leader or a member which is currently transmitting.

7. The method according to claim 5 or 6, wherein the step of adapting is performed iteratively and/or wherein the step of adapting is performed iteratively until only one member or a certain number of members provide respective report messages (22f).

8. The method according to one of the claims 5 to 7, wherein the step of adapting comprises the step of increasing and/or decreasing a transmission power of the transceiver (10t).

9. The method according to claim 8, wherein an increase of the transmission power is performed, when the report message (22f) indicates a too low received signal strength at the receiving member (10r, 10r1, 10r2, 10r3) and/or wherein the decrease of the transmission power is performed, when the report message (22f) indicates a too high received signal strength at the receiving member (10r, 10r1 , 10r2, 10r3).

10. The method according to one of claims 5 to 9, wherein the steps of performing a power measurement and reporting on the measurement values are performed by a second member (12r2); or wherein the steps of performing a power measurement and reporting on the measurement values are performed by a second member (12r2), and wherein the step of adapting comprising the step of selecting a report message (22f) of the first or second member (12r2), wherein the report message (22f) is selected by the member out of the group comprising the first and the second member (12r2) which has the weakest measurement value and/or which has the highest distance or highest minimum required communication range to a transmitting member (10t) and/or which has the highest path loss to a respective destination receiver.

11. The method according to one of claims 5 to 10, wherein the reporting is just performed, if the minimum required communication range criterion indicating a minimum required communication range is met.

12. The method according to one of the claims 5 to 11, wherein the power threshold or the power threshold range is provided by the network, a base station (14) of the network or a group leader; or wherein the power threshold or the power threshold range is predetermined for the network; and/or wherein a transmission power is set by a member of the group or the network or a base station (14) of the network or a group leader.

13. The method according to one of claims 5 to 12, wherein the power threshold or the power threshold range is broadcasted using MIB or SIB and/or broadcasted in the coverage area and/or multi-casted using beamforming and/or multi-casted into a certain geographical area and/or multi-casted just to members in a close range using narrowband beam and/or multi-casted to members in a far range using pencil beam.

14. The method according to one of claims 5 to 13, wherein the report message (22f) comprises information regarding one or more of: a received power; a RSRP or RSSI or RSRQ, CQI, PMI, SNR, SINR, any other type of CSI or type of interference indication; a communication range; a path loss; a required increase of transmit power; a required decrease of transmit power; a single bit indicating increase or decrease; a signal sequence indicating a predetermined increase step; a signal sequence indicating a predetermined decrease step; a signal sequence indicating a decrease or stay at the current level; a step size of increasing and/or decreasing.

15. Method to perform power control on a transceiver(10t) of a member within a network comprising a plurality of members according to a groupcast approach, the method comprising the steps: providing a transmission power information on a transmission power which is set by a member of the group or the network or a group leader power threshold or a power threshold range to one or more members of the network; and adapting the transmission power based on the transmission power information.

16. The method according to one of claims 3 to 15, wherein the report message (22f) is exchanged using sidelink interface or a physical sidelink control channel (PSCCH) or a physical sidelink feedback channel (PSFCH).

17. The method according to one of claims 5 to 16, wherein the method comprises the step of limiting the transmission power; or wherein the method comprises the step of limiting the transmission power based on a command which is sent by the network or a base station (14) of the network.

18. The method according to one of claims 5 to 17, wherein the report message (22f) is sent or forwarded to other groups within the network.

19. Method to perform power control on a transceiver (10t) of a member within a network comprising a plurality of members according to a broadcast approach, the method comprising the steps: determining a first member (12r1) of the network having a highest distance to the other members of the network and/or a highest path loss when compared to the other members of the network; performing a power management at the first member (12r1) of the network to obtain a measurement value of a given transmission for the first member (12r1 ); reporting by use of a report message (22f) of the first member (12r1) on the measurement value of the first member (12r1); and adapting a transmission power based on the report message (22f) of the first member (12r1).

20. The method according to claim 19, wherein the step of determining, performing and reporting is performed by a second member (12r2), such that the step of adapting is performed based on the report message (22f) of the second member (12r2), if the first member (12r1) has moved such that the second member (12r2) has the highest distance to the other members of the network or the highest path loss when compared to the other members of the network.

21. The method according to one of claims 2 to 20, wherein the step of adapting is performed by a transceiver (10t) of a transmitting member (10t) of the network.

22. The method according to one of claims 2 to 21, wherein the method comprises the steps providing a set of information on positions of the plurality of members; and determining a transmit power of a transmitting member (10t) dependent on the positions of the plurality of members and a position of the transmitting member(10t); or wherein the method comprises the steps providing an information on an initial transmission power, a maximum or a minimum transmission power or an adaption rate of the transmission power; and adapting a transmit power of a transmitting member (10t) dependent on the information.

23. User equipment (UE) configured to communicate within a network comprising a plurality of members, wherein a transceiver (10t) of the user equipment (UE) is configured to perform power management according to a unicast approach and/or a groupcast approach and/or a broadcast approach as defined by one of claims 3 to 22.

24. The user equipment (UE) according to claim 23, wherein a transceiver (10t) of the user equipment (UE) is configured to perform the step of adapting a transmission power or wherein a transceiver (10t) of the user equipment (UE) is configured to perform the step of performing a power measurement.

25. Method for controlling a transceiver (10t) of a member within a network comprising a plurality of members, the method comprising the following steps: providing a set of information on positions of the plurality of members; and determining a transmit power of a transmitting member (10t) dependent on the positions of the plurality of members and a position of the transmitting member (10t); or providing an information on an initial transmission power, a maximum or minimum transmission power or an adaption rate of the transmission power; and determining a transmit power of a transmitting member (10t) dependent on the information.

26. The method according to claim 25, wherein the step of determining a transmit power is performed for each transmitting UE.

27. The method according to claim 25 and 26, wherein the step of providing is performed by a base station (14) or a group leader of the network; and/or wherein the set of information is forwarded by a member or a group leader and/or forwarded to a member out-of-coverage or not under the control of the network.

28. The method according to one of claims 24 to 27, wherein the method comprises the step of collecting information on other positions of members of the network which are out of coverage.

29. The method according to one of claims 24 to 28, wherein the step of providing a set of information comprises information on a motion of the members.

30. The method according to one of claims 24 to 29, wherein the step of determining is performed by considering a path loss between a position of a transmitting member (10t) and each position of the receiving members (10r, 10P, 10r2, 10r3).

31. The method according to one of claims 3 to 22 and 24 to 30, wherein an information on a power threshold, an information on a power threshold range, a report message (22f) and/or a set of information on positions is exchanged together with a HARQ- ACK or HARQ-NACK signals.

32. The method according to one of claims 3 to 22 and 24 to 31 , wherein information on a power threshold or a power threshold range, a report message (22f) and/or an information set on positions are exchanged using a physical sidelink feedback channel, a physical sidelink control channel, a physical sidelink shared channel or dynamical channels or semi-static channels.

33. A user equipment (UE) configured to communicate within a network comprising a plurality of members, wherein a transceiver (10t) of the user equipment (UE) is configured to receive a set of information on positions on the member and to determine a transmit power dependent on the positions of the members and an own position.

34. A base station (14) of a network comprising a plurality of members, wherein the base station (14) is configured to provide a set of information on positions of the members to enable the members to perform power control.

35. A method to perform power control on a transceiver (10t) of a member within the network comprising a plurality of members, the method comprises the step of exchanging information on a power threshold, a power threshold range, a report message (22f) comprising a measurement value of a power measurement and/or a list of information or positions of members of the network, wherein the exchange is performed together with an HARQ-ACK or an HARQ-NACK signal.

36. A user equipment (UE) and/or a base station (14) which are configured to exchange information on a power threshold or on a power threshold range, a report message (22f) comprising a measurement value of a power measurement and/or a list of information on positions of members of a network together with an HARQ-ACK and/or an HARQ-NACK signal.

37. A method to perform power control on a transceiver (10t) of a member within the network comprising a transmitting member (10t), which is configured to use one or more uplinks and one or more sidelinks, and at least a receiving member (10r, 10r1 , 10r2, 10r3), which receives data via the one sideiink from the transmitting member (10t), the method comprises the steps: calculating an entire required transmit power for the transmitting member (10t) required for the one or more uplinks and the one or more sidelinks; and splitting a transmission power based on the calculated entire required transmit power.

38. The method according to claim 37, wherein the calculation is performed based on the formula P_total = P_SL + P_UL, wherein P_SL is the power for the sideiink or a sum power of the sidelinks, P_total is the power which can be transmitted by a transceiver (10t) and P_UL is the power for the uplink or a sum power of the uplinks.

39. The method according to claim 37 or 38, wherein the power for the one or more uplinks is reduced, when a required power for the sidelink is higher than an available power or when the measurement value indicates a low received power.

40. The method according to one of claims 37 to 39, wherein the method further comprise performing a power measurement at the receiving member (10r, 10r1 , 10r2, 10r3) of the network to obtain a measurement value of a given transmission for the sidelink received from the transmitting member (10t); and reporting by use of report message (22f) on the measurement value, a path loss or a remaining transmission power so that the step of splitting is performed considering the report massage; or wherein the method further comprise performing a power measurement at the receiving member (10r, 10r1 , 10r2, 10r3) of the network to obtain a measurement value of a given transmission for the sidelink received from the transmitting member (10t); and reporting by use of report message (22f) on the measurement value, a path loss or a remaining transmission power so that the step of splitting is performed considering the report massage, wherein the step of performing a power measurement and reporting is performed for a plurality of sidelinks and/or for one or more uplinks.

41. The method according to claim 40, wherein the power measurement is performed by a receiving member (10r, 10r1, 10r2, 10r3) or receiving user equipment (UE) and/or wherein the step of calculating and adapting is performed by a transmitting member (10t) or transmitting user equipment (UE).

42. User equipment (UE) configured to communicate within a network comprising a transmiting member (10t) using one or more uplinks and one or more sidelinks and at least a receiving member (10r, 10r1, 10r2, 10r3), which receives data via the one sidelink from the transmitting member (10t), wherein the user equipment (UE) forming the transmitting member (10t) comprises a transceiver (10t) configured to perform power control, wherein the power control is based on a calculation of an entire required transmit power for the transmitting member(10t) required for the one or more uplinks and the one or more sidelinks and is configured to split a transmission power based on the calculated entire required transmit power.

43. A method to perform power control on a transceiver (10t) of a member within a network comprising a plurality of members and using joint resource pool for one or more uplinks and for one or more sidelinks, the method comprises: calculating a transmit power to be used for the one or more uplinks and for the one or more sidelink; and optimizing a distribution of the transmit power considering one or more of the following factors: priority of data packets to be transmitted; distance between the transmitting member (10t) and a base station; distance between a transmitting member (10t) and a receiving member (10r, 10r1, 10r2, 10r3); receiving capability of the base station (14) and a receiving member (10r, 10r1, 10r2, 10r3); interference caused by neighboring members; priority of the base station (14) communication; priority of the sidelink resource pool; semi-persistent scheduled resources; preconfigured resources; and preempted resources.

44. The method according to claim 43, wherein the step of optimizing comprising the step of using semi-persistent scheduled resources for a sidelink or using semi- persistent scheduled resources for the sidelink and adapting the transmit power for the sidelink.

45. The method according to one of claims 43 and 44, wherein the step of optimizing comprising transferring semi-persistent resources to other members of the network or transferring semi-persistent scheduled resources to other members of the network and adapting the transmit power for the transferred resources.

46. User equipment (UE) which is configured to communication within a network using a joint resource pool for one or more uplinks and for one or more sidelinks, wherein a transceiver (10t) of the user equipment (UE) is configured to calculate a transmit power to be used for the one or more uplinks and for the one or more sidelinks; and optimize a distribution of the transmit power considering one or more of the following factors:

- priority of data packets to be transmitted;

- distance between the transmitting member (10t) and a base station;

- distance between a transmitting member (10t) and a receiving member (10r, 10r1, 10r2, 10r3);

- receiving capability of the base station (14) and a receiving member (10r,

10r1, 10r2, 10r3);

- interference caused by neighboring members;

- priority of the base station (14) communication;

- priority of the sidelink resource pool;

- semi-persistent scheduled resources; and

- preconfigured resources; and/or preempted resources.

47. The method according to one of claims 1 , 3 to 22, 25 to 32, 35, 37 to 41 and 43 to 45, further comprising signaling or indirect signaling to increase the transmit power of the transmitting member, if the transmitting member receives a one or more NACKS or a certain number of NACKs.

48. Computer program for performing when running on a computer one of the methods according to one of claims 1 , 3 to 22, 25 to 32, 35, 37 to 41 and 43 to 45 and 47.

49. A system comprising at least one of the entities according to claims 2, 23, 24, 33, 34, 36, 42 and 46 and another user equipment (UE) or another base station.