WO2021035483A1

WO2021035483A1 - Uplink power control scheme

Info

Publication number: WO2021035483A1
Application number: PCT/CN2019/102596
Authority: WO
Inventors: Pingping Wen
Original assignee: Nokia Shanghai Bell Co., Ltd.; Nokia Solutions And Networks Oy; Nokia Technologies Oy
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-03-04
Also published as: CN114600404A

Abstract

Systems, methods, apparatuses, and computer program products for an uplink power control scheme in 5G non-terrestrial networks. A method may include receiving, at a user equipment, a plurality of sets of power control parameters. The method may also include selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The method may further include calculating a transmission power with the corresponding set of power control parameters. In addition, the method may include applying the calculated transmission power to a communication with a network node with the retransmission scheme.

Description

UPLINK POWER CONTROL SCHEME

FIELD:

Some example embodiments may generally relate to mobile or wireless telecommunication systems, such as Long Term Evolution (LTE) or fifth generation (5G) radio access technology or new radio (NR) access technology, or other communications systems. For example, certain embodiments may relate to apparatuses, systems, and/or methods for an uplink (UL) power control scheme in 5G non-terrestrial networks (NTN) .

BACKGROUND:

Examples of mobile or wireless telecommunication systems may include the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) , Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN) , LTE-Advanced (LTE-A) , MulteFire, LTE-APro, satellite communication system, and/or fifth generation (5G) radio access technology or new radio (NR) access technology. Fifth generation (5G) wireless systems refer to the next generation (NG) of radio systems and network architecture. 5G is mostly built on a new radio (NR) , but the 5G (or NG) network can also build on E-UTRAN radio. It is estimated that NR will provide bitrates on the order of 10-20 Gbit/sor higher, and will support at least enhanced mobile broadband (eMBB) and ultra-reliable low-latency-communication (URLLC) as well as massive machine type communication (mMTC) . NR is expected to deliver extreme broadband and ultra-robust, low latency connectivity and massive networking to support the Internet of Things (IoT) . With IoT and machine-to-machine (M2M) communication becoming more widespread, there will be a growing need for networks that meet the needs of lower power, low data rate, and long battery life. It is noted that, in 5G, the nodes that can provide radio access functionality to a user equipment (i.e., similar to Node B in UTRAN or eNB in LTE) are named gNB when built on NR radio and named NG-eNB when built on E-UTRAN radio.

SUMMARY:

One embodiment may be directed to a method. The method may include receiving, at a user equipment, a plurality of sets of power control parameters. The method may also include selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The method may further include calculating a transmission power with the corresponding set of power control parameters. In addition, the method may include applying the calculated transmission power to a communication with a network node with the retransmission scheme.

Another example embodiment may be directed to an apparatus. The apparatus may include means for receiving a plurality of sets of power control parameters. The apparatus may also include means for selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The apparatus may further include means for calculating a transmission power with the corresponding set of power control parameters. In addition, the apparatus may include means for applying the calculated transmission power to a communication with a network node with the retransmission scheme.

Another example embodiment may be directed to an apparatus which may include at least one processor and at least one memory including computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to, receive a plurality of sets of power control parameters. The apparatus may also be caused to select a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The apparatus may further be caused to calculate a transmission power with the corresponding set of power control parameters. In addition, the apparatus may be caused to apply the calculated transmission power to a communication with a network node with the retransmission scheme.

In accordance with some example embodiments, a non-transitory computer readable medium can be encoded with instructions that may, when executed in hardware, perform a method. The method may include receiving a plurality of sets of power control parameters. The method may also include selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The method may further include calculating a transmission power with the corresponding set of power control parameters. In addition, the method may include applying the calculated transmission power to a communication with a network node with the retransmission scheme.

In accordance with some example embodiments, a computer program product may perform a method. The method may include receiving a plurality of sets of power control parameters. The method may also include selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The method may further include calculating a transmission power with the corresponding set of power control parameters. In addition, the method may include applying the calculated transmission power to a communication with a network node with the retransmission scheme.

In accordance with some example embodiments, an apparatus may include circuitry configured to receive a plurality of sets of power control parameters. The apparatus may also include circuitry configured to select a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. The apparatus may further include circuitry configured to calculate a transmission power with the corresponding set of power control parameters. In addition, the apparatus may include circuitry configured to apply the calculated transmission power to a communication with a network node with the retransmission scheme.

In accordance with some example embodiments, a method may include configuring, by a network node, a user equipment with a plurality of sets of power control parameters. The method may also include indicating a retransmission scheme to the user equipment. The method may further include receiving a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In accordance with some example embodiments, an apparatus may include means for configuring a user equipment with a plurality of sets of power control parameters. The apparatus may also include means for indicating a retransmission scheme to the user equipment. The apparatus may further include means for receiving a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In accordance with some example embodiments, an apparatus may include at least one processor and at least one memory including computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to configure a user equipment with a plurality of sets of power control parameters. The apparatus may also be caused to indicate a retransmission scheme to the user equipment. The apparatus may further be caused to receive a communication from the user equipment with the retransmission scheme. In an example embodiment, the retransmission communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In accordance with some example embodiments, a non-transitory computer readable medium can be encoded with instructions that may, when executed in hardware, perform a method. The method may include configuring a user equipment with a plurality of sets of power control parameters. The method may also include indicating a retransmission scheme to the user equipment. The method may further include receiving a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In accordance with some example embodiments, a computer program product may perform a method. The method may include configuring a user equipment with a plurality of sets of power control parameters. The method may also include indicating a retransmission scheme to the user equipment. The method may further include receiving a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In accordance with some embodiments, an apparatus may include circuitry configured to configure a user equipment with a plurality of sets of power control parameters. The apparatus may also include circuitry configured to indicate a retransmission scheme to the user equipment. The apparatus may further include circuitry configured to receive a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

BRIEF DESCRIPTION OF THE DRAWINGS:

For proper understanding of example embodiments, reference should be made to the accompanying drawings, wherein:

FIG. 1 illustrates a physical uplink shared channel (PUSCH) -PowerControl information element, according to an example embodiment.

FIG. 2 (a) illustrates a flow diagram of a user equipment behavior for a retransmission scheme based on uplink power control, according to an example embodiment.

FIG. 2 (b) illustrates different power for different retransmission schemes, according to an example embodiment.

FIG. 3 illustrates another PUSCH-PowerControl information element, according to an example embodiment.

FIG. 4 illustrates different uplink transmission powers for different retransmission schemes, according to an example embodiment.

FIG. 5 illustrates different retransmission schemes per hybrid automatic repeat request (HARQ) process, according to an example embodiment.

FIG. 6 illustrates a further PUSCH-PowerControl information element, according to an example embodiment.

FIG. 7 illustrates another PUSCH-PowerControl information element, according to an example embodiment.

FIG. 8 illustrates different uplink transmission powers for hybrid automatic repeat request processes with different retransmission schemes, according to an example embodiment.

FIG. 9 illustrates an example flow diagram of a method, according to an example embodiment.

FIG. 10 illustrates a flow diagram of another method, according to an example embodiment.

FIG. 11 (a) illustrates an apparatus, according to an example embodiment.

FIG. 11 (b) illustrates another apparatus, according to an example embodiment.

DETAILED DESCRIPTION:

It will be readily understood that the components of certain example embodiments, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. The following is a detailed description of some example embodiments of systems, methods, apparatuses, and computer program products for an uplink (UL) power control scheme in 5G non-terrestrial networks (NTN) .

The features, structures, or characteristics of example embodiments described throughout this specification may be combined in any suitable manner in one or more example embodiments. For example, the usage of the phrases “certain embodiments, ” “an example embodiment, ” “some embodiments, ” or other similar language, throughout this specification refers to the fact that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment. Thus, appearances of the phrases “in certain embodiments, ” “an example embodiment, ” “in some embodiments, ” “in other embodiments, ” or other similar language, throughout this specification do not necessarily all refer to the same group of embodiments, and the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments.

Additionally, if desired, the different functions or steps discussed below may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the described functions or steps may be optional or may be combined. As such, the following description should be considered as merely illustrative of the principles and teachings of certain example embodiments, and not in limitation thereof.

3 ^rd Generation Partnership Project (3GPP) may extend to the applicability of NTN in Rel-15, for example to use 5G radio access for satellite links. In a mobile communication system, UL power control may serve an important purpose, and configure powers for different UL physical channels. Further, signals may be controlled to ensure that they are received with appropriate power to maintain the link quality corresponding to the required Quality-of-Service (QoS) . To achieve this purpose, the power control may be adapted to the characteristics of the radio propagation channel, including path-loss, shadowing and fast fading, as well as overcoming interference from other users.

In an NTN system, certain new features and techniques may occur, which may impact the UL power control mechanism including, for example, the retransmission techniques. Hybrid automatic repeat request (HARQ) issues have been discussed, and some problems of HARQ may exist in NTN. For example, HARQ in NTN may result in large propagation delays that may force an increase in the amount of HARQ-processes. This may be impractical due to the extreme buffer size requirement for the receivers’s oft buffer and large signaling requirement on indicating the HARQ process number. Additionally, the retransmission may cause long latency for a packet. Thus, to address some of these issues, HARQ disabling has been described in 3GPP.

Networks that disable HARQ via radio resource control (RRC) configuration may be supported, and for further study on dynamic disabling of HARQ by the gNB. Furthermore, some open loop/blind retransmission (e.g., retransmission without feedback) may increase the transmission reliability. Additionally, HARQ enabling/disabling as well as blind retransmission may have some advantages and disadvantages. For instance, the gNB may determine which scheme may be used based on certain factors such as, for example, QoS requirement (reliability and latency) , dynamic status of the UE buffer, power consumption, and others. For each type of retransmission scheme, there may be different UL transmission power requirements. In addition, the power control behavior with HARQ disabling may be different as compared to HARQ enabling. Furthermore, a higher signal-to-interference-plus-noise ratio (SINR) and lower block error rate (BLER) may be needed with HARQ disabling. As such, according to certain example embodiments, it may be possible to provide a new UL power control scheme in NTN to support multiple types of retransmission schemes (e.g., dynamic HARQ disabling/enabling, blind retransmission, etc. ) simultaneously.

A certain power control scheme may be provided in LTE. For example, the power control scheme in LTE may employ a combination of open-loop and closed-loop controls. In particular, the open-loop power control may set a coarse operating point for the transmission power spectrum density (PSD) for a reference modulation and coding scheme (MCS) based on path-loss estimation. Further, the closed-loop power control may adjust the power around the open-loop operating point to fine-tune the power setting to suit the channel condition as well as the interference level. In the open-loop power control for the physical uplink shared channel (PUSCH) , the UL PSD may be compensated for the path-loss with fractional power control (FPC) , which may be one type of scheme between “no compensation” and “full compensation. ” The FPC may be shown as: P = P0 + α ·PL. Here, P represents the transmission power of one resource bock (RB) , P0 represents the basic power setting that can be set considering the target received, α represents a path-loss compensation factor, and PL [db] represents the downlink (DL) path-loss estimate calculated in the UE.

Full path-loss compensation (with α = 1) may maximize fairness for cell-edge UEs. However, when considering multiple cells together as a system, the use of partial path-loss compensation may increase the total system capacity in the UL, as less inter-cell interference is caused to neighboring cells. Further, path-loss compensation factors of about 0.7 –0.8 may give a close-to-maximum UL system capacity (about 15 –25%greater than that can be achieved with full path-loss compensation) without causing significant degradation to the cell-edge data rate.

Additionally, a certain power control scheme may be provided in an NR system. For example, in an NR system, the FPC principle may be used due to its advantages and good performance considering the capability on both controlling the received signal power, and the interference to the users in other cells. Considering the beamforming used in the NR system, the FPC may be improved to support both beam specific path-loss as well as the beam specific power control parameters.

In addition to power control schemes in LTE and NR, a certain power control scheme may also be provided in NTN. For example, a need and the applicable scenarios for potential enhancements (with respect to the power control schemes in NR Rel-15) for both open-loop and closed-loop power control for NTN, are to be studied. However, there is currently no mechanism proposed on UL power control (ULPC) to support multiple types of retransmission schemes simultaneously. Further, there are different retransmission schemes discussed in NTN including, for example, semi-static HARQ enabling/disabling, dynamic HARQ enabling/disabling, blind/open retransmission with different number of repetitions, pre-ACK retransmission, and others.

Each type of retransmission scheme may have different UL transmission power requirements to achieve the target BLER. For example, if HARQ is disabled, the transmission power may be increased to achieve the higher SINR and lower BLER, and to guarantee the transmission reliability of the first transmission. Thus, the UL transmission power may be adaptively set to the suitable value for each retransmission scheme. However, no solutions are currently available on ULPC that considers the different retransmission schemes in an NTN system. Certain example embodiments may provide a flexible ULPC scheme that can adapt to the multiple types of retransmission schemes, and set reasonable power values that take into account the different retransmission schemes.

According to certain example embodiments, it may be possible to provide UL power control solutions that support the different retransmission schemes in an NTN system. For example, in one embodiment, a retransmission scheme based UL power control in an NTN system may support multiple types of retransmission schemes simultaneously including, for example, semi-static and dynamic HARQ disabling/HARQ enabling, as well as blind retransmission etc.

In certain example embodiments, multiple sets of UL power control parameters may be configured to the UE for multiple retransmission schemes. Further, different sets of parameters may be provided/set for different corresponding retransmission schemes. In addition, the UE may select the corresponding power control parameters based on the indicated retransmission scheme, and calculate the transmission power with a power control scheme with corresponding parameters. In an example embodiment, the power control scheme may include FPC.

According to certain example embodiments, the multiple retransmission schemes may include HARQ disabling, HARQ enabling, blind retransmission, pre-active retransmission as well as other new retransmission schemes. In one example embodiment, the configuration may have different settings configured for different retransmission schemes. For example, in an embodiment, the configuration may have different P0 and αconfigured for different retransmission schemes when FPC is used. In another example embodiment, the configuration may include a setting configured for one retransmission scheme (e.g., HARQ enabling) , and a differential value may be configured for other retransmission schemes. In one example embodiment when FPC is used, the setting may include a P0 and α, and the differential value may include a power offset.

In a further example embodiment, the configuration may include different settings configured for different HARQ processes that may be configured with different retransmission schemes. For example, when FPC is used, in one embodiment, different P0 and α settings may be configured for different HARQ processes that may be configured with different retransmission schemes. According to an example embodiment, a setting may be configured for a certain number of HARQ processes that may be configured with a corresponding retransmission scheme (e.g., HARQ enabling) , and a certain number of differential values that may be configured for other HARQ processes that may be configured with other retransmission schemes. For example, in one embodiment when FPC is used, a P0 and αmay be configured for the certain number of HARQ processes, and the certain number of power offsets may be configured for other HARQ processes.

According to an example embodiment, different retransmission schemes may be provided in NTN including, for example, semi-static HARQ enabling/disabling, dynamic HARQ enabling/disabling, blind/open retransmission with different number of repetitions, and pre-ACK retransmission. As previously noted, each type of retransmission scheme may have different UL transmission power requirements to achieve the target BLER. For example, if HARQ is disabled, the transmission power may be increased to achieve the higher SINR and lower BLER. Thus, it may be possible to guarantee the transmission reliability of the first transmission since there may be no retransmission.

Additionally, in an example embodiment, the blind/open retransmission scheme may be one scheme to retransmit the packet without waiting for the feedback which may be configured to support a different number of repetitions. In addition, for the blind/open retransmission with a different number of repetitions, the required transmission may be different. For example, in one embodiment, the transmit power may be lower when the repetition number is 4 as compared to when the repetitions number is 2. Furthermore, since the blind/open retransmission and the HARQ enabling are both supported by the retransmission, the transmit power may be set as the same or similar value if the maximum retransmission number and the number of the repetitions are the same.

According to an example embodiment, a different P0 and α may be configured for different retransmission schemes. For instance, in one embodiment, the gNB may configure multiple sets of P0 and α for multiple retransmission schemes, and each set of P0 and α may correspond to one retransmission scheme. For example, in one embodiment, { “P0_HARQ_enabled” , “alpha_HARQ enabled” } may be configured for HARQ enabling. In another example embodiment, { “P0_HARQ_disabled” , “alpha_HARQ disabled” } may be configured for HARQ disabling. In a further example embodiment, { “P0_HARQ_blindretrans_repetition2” , “alpha_HARQ_blindretrans_repetition2” } may be configured for blind retransmission with a repetition number of 2. According to another example embodiment, { “P0_HARQ_blindretrans_repetition4” , “alpha_HARQ_blindretrans_repetition4” } may be configured for blind retransmission with a repetition number of 4. According to a further example embodiment, { “P0_HARQ_other” , “alpha_HARQ_other” } may be configured for other new transmission schemes.

According to certain example embodiments, when different P0 and αare configured for different retransmission schemes, the gNB may also configure multiple sets of P0 and α, and one of the sets for multiple retransmission schemes. For example in an embodiment, { “P0_HARQ_enabled_blindretrans_repetition4” , “alpha_HARQ_enabled_blindretrans_repetion4” } may be configured for HARQ enabling and blind retransmissions with a repetition number of 4. In another example embodiment, { “P0_HARQ_disabled” , “alpha_HARQ disabled” } may be configured for HARQ disabling. In a further example embodiment, { “P0_HARQ_blindretrans_repetition2” , “alpha_HARQ_blindretrans_repetition2” } may be configured for blind retransmissions with a repetition number of 2. According to another example embodiment, { “P0_HARQ_other” , “alpha_HARQ_other” } may be configured for other new transmission schemes.

FIG. 1 illustrates a PUSCH-PowerControl information element, according to an example embodiment. For example, FIG. 1 illustrates an information element (IE) PUSCH-PowerControl used to configure a UE specific power control parameter for PUSCH.

FIG. 2 (a) illustrates a flow diagram of the UE behavior for a retransmission scheme based on UL power control, according to an example embodiment. Further, FIG. 2 (b) illustrates different power for different retransmission schemes, according to an example embodiment. As illustrated in FIGs. 2 (a) and 2 (b) , on the UE side, the retransmission scheme may be informed to the UE semi-statically through RRC signaling or dynamically with downlink control information (DCI) . Further, in an example embodiment, for each retransmission scheme, the UL power control may be derived with the power control formula previously described herein, as well as with the corresponding set of power control parameters illustrated in FIGs. 2 (a) and 2 (b) .

As illustrated in FIG. 2 (a) , at 200, the UE may receive a configuration of multiple sets of UL power control parameters for multiple retransmission schemes. At 205, the UE may decide on the type of retransmission scheme based on semi-static or dynamic signaling. Further, at 210, the UE may decide the corresponding UL power control parameters for the decided retransmission scheme. In addition, at 215, the UE may calculate the UL transmission power based on the decided parameters.

Additionally, FIG. 2 (b) illustrates different amounts of power configured to the UE depending on the type of the retransmission scheme. For instance, FIG. 2 (b) illustrates UL transmission powers for when a different P0 and α are configured for different retransmission schemes, as previously described. In an example embodiment, the UL transmission power for the fully disabled retransmission scheme may be the highest out of the four different retransmission schemes. As also illustrated in FIG. 2 (b) , the 2-blind retransmission scheme may have the second highest UL transmission power, while the 4-blind retransmission scheme and the fully enabled retransmission scheme may have the least amount of UL transmission power.

FIG. 3 illustrates a PUSCH-PowerControl information element, according to an example embodiment. As illustrated in FIG. 3, the new parameter may be introduced in the PUSCH-PowerControl information element, and the new IE PUSCH-PowerControl element is illustrated in FIG. 3.

FIG. 4 illustrates different uplink transmission powers for different retransmission schemes, according to an example embodiment. For instance, according to certain example embodiments, P0 and α may be configured for HARQ enabling, and multiple offsets may be configured to other retransmission schemes. For example, “P_offset_HARQ_disabled” may be configured for HARQ disabling, “P_offset_HARQ_blindretrans_repetition2” may be configured for blind retransmission with a repetition number of 2, and “P_offset_HARQ_blindretrans_repetition4” may be configured for blind retransmission with a repetition number of 4. According to another example embodiment, the retransmission scheme may be informed to the UE semi-statically or dynamically. In addition, as illustrated in FIG. 4, for each retransmission scheme, the UL power control may be derived with the power control formula with the parameters for HARQ enabling and the power offset for the corresponding retransmission scheme.

FIG. 5 illustrates different retransmission schemes per HARQ process, according to an example embodiment. In an example embodiment, if radio resource control (RRC) signaling configures the different retransmission schemes for different HARQ processes and the UE is provided with the retransmission scheme through the HARQ process ID, the power control parameters may also be configured differently to different HARQ processes (i.e., HARQ process based power control) . In certain example embodiments, RRC may convey a list of different treatment for different HARQ processes. For example, in an embodiment, HARQ processes 0-1 may be disabled. In another example embodiment, HARQ processes 2-7 may be disabled, and K-proactive retransmissions may be performed, where K=2. In a further example embodiment, HARQ processes 8-11 may be disabled, and K- proactive retransmissions may be performed, where K=4 (or even other blind-transmission redundancy schemes) . According to another example embodiment, HARQ processes 12-15 may be enabled as in legacy standards.

Correspondingly, in certain example embodiments, RRC may also configure the different sets of power control parameters to different HARQ processes. For example, in an embodiment, for HARQ processes 0-1, { “P0_HARQdisabled” , “alpha_HARQ disabled” } may be configured. In another example embodiment, for HARQ processes 2-7, { “P0_HARQ_blindretrans_repetition2” , “alpha_HARQ_blindretrans_repetition2” } may be configured. According to another example embodiment, for HARQ processes 8-11, { “P0_HARQ_blindretrans_repetition4” , “alpha_HARQ_blindretrans_repetition4” } may be configured. According to a further example embodiment, for HARQ processes 12-15, { “P0_HARQenabled” , “alpha_HARQ enabled” } may be configured. Support for the solution involving RRC signaling configurations is illustrated in FIG. 6, where the new parameter may be introduced in the PUSCH-PowerControl information element.

According to certain example embodiments, RRC may configure one set of power control parameters for a certain number of HARQ processes, and the different power offset to the remaining HARQ processes. For example, for HARQ processes 0-1, P_offset_HARQ_disabled may be configured. In another example embodiment, for HARQ processes 2-7, P_offset_HARQ_blindretrans_repetitions2 may be configured. According to a further example embodiment, for HARQ processes 8-11, P_offset_HARQ_blindretrans_repetition4 may be configured. According to another example embodiment, for HARQ processes 12-15, P0 and α may be configured. Support for this solution is illustrated in FIG. 7, where the new parameter may be introduced in the PUSCH-PowerControl information element.

FIG. 8 illustrates different UL transmission powers for HARQ processes with different retransmission schemes, according to an example embodiment. In an example embodiment, in the UE side, the UE may derive the HARQ process ID and corresponding power control parameters. In another example embodiment, the UL power control may be derived with the power control formula with the parameters for the HARQ process.

FIG. 9 illustrates an example flow diagram of a method, according to an example embodiment. In certain example embodiments, the flow diagram of FIG. 9 may be performed a mobile station and/or UE, for instance similar to apparatus 10 illustrated in FIG. 11 (a) . According to one example embodiment, the method of FIG. 9 may include initially, at 300, receiving, at a UE, a plurality of sets of power control parameters. The method may also include, at 305, determining the retransmission scheme based on semi-static or dynamic signaling. The method may further include, at 310, selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. In addition, the method may include, at 315, calculating a transmission power with the corresponding set of power control parameters. Further, at 320, the method may include applying the calculated transmission power to a communication with a network node with the retransmission scheme.

In an example embodiment, the retransmission scheme may include hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme. In another example embodiment, the retransmission scheme may include corresponding uplink transmission power requirements. In a further example embodiment, the plurality of sets of power control parameters may include a different basic power setting P0 and path-loss compensation factor α for different retransmission schemes. According to an example embodiment, the plurality of sets of power control parameters may include P0 and α configured for one retransmission scheme and a power offset configured for other retransmission schemes.

According to another example embodiment, the plurality of sets of power control parameters may include different P0 and α configured for different HARQ processes that are configured with different retransmission schemes. According to a further example embodiment, the plurality of sets of power control parameters may include different P0 and α configured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes. In an example embodiment, the power control parameters may be uplink power control parameters, and the transmission power may be an uplink transmission power.

FIG. 10 illustrates a flow diagram of another method, according to an example embodiment. In an example embodiment, the method of FIG. 10 may be performed by a network entity or network node in a 3GPP system, such as LTE or 5G-NR. For instance, in an example embodiment, the method of FIG. 10 may be performed by a network node, a base station, eNB, or gNB, for instance similar to apparatus 20 illustrated in FIG. 11 (b) . According to one example embodiment, the method of FIG. 10 may include initially, at 400, configuring a UE with a plurality of sets of power control parameters. The method may also include, at 405, indicating a retransmission scheme to the user equipment. The method may further include, at 410, receiving a communication with the UE with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

In another example embodiment, the indication of the retransmission scheme may be performed semi-statically or dynamically. In a further example embodiment, the retransmission scheme may include hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme. According to an example embodiment, the retransmission scheme comprises corresponding uplink transmission power requirements. According to another example embodiment, the plurality of sets of power control parameters may include a different basic power setting P0 and path-loss compensation factor α for different retransmission schemes. According to a further example embodiment, the plurality of sets of power control parameters may include P0 and α configured for one retransmission scheme and a power offset configured for other retransmission schemes. In an example embodiment, the plurality of sets of power control parameters may include different P0 and α configured for different HARQ processes that are configured with different retransmission schemes. In another example embodiment, the plurality of sets of power control parameters may include different P0 and αconfigured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes.

FIG. 11 (a) illustrates an apparatus 10 according to an example embodiment. In an embodiment, apparatus 10 may be a node or element in a communications network or associated with such a network, such as a UE, mobile equipment (ME) , mobile station, mobile device, stationary device, IoT device, or other device. As described herein, UE may alternatively be referred to as, for example, a mobile station, mobile equipment, mobile unit, mobile device, user device, subscriber station, wireless terminal, tablet, smart phone, IoT device, sensor or NB-IoT device, or the like. As one example, apparatus 10 may be implemented in, for instance, a wireless handheld device, a wireless plug-in accessory, or the like.

In some example embodiments, apparatus 10 may include one or more processors, one or more computer-readable storage medium (for example, memory, storage, or the like) , one or more radio access components (for example, a modem, a transceiver, or the like) , and/or a user interface. In some embodiments, apparatus 10 may be configured to operate using one or more radio access technologies, such as GSM, LTE, LTE-A, NR, 5G, WLAN, WiFi, NB-IoT, Bluetooth, NFC, MulteFire, and/or any other radio access technologies. It should be noted that one of ordinary skill in the art would understand that apparatus 10 may include components or features not shown in FIG. 11 (a) .

As illustrated in the example of FIG. 11 (a) , apparatus 10 may include or be coupled to a processor 12 for processing information and executing instructions or operations. Processor 12 may be any type of general or specific purpose processor. In fact, processor 12 may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) , field-programmable gate arrays (FPGAs) , application-specific integrated circuits (ASICs) , and processors based on a multi-core processor architecture, as examples. While a single processor 12 is shown in FIG. 11 (a) , multiple processors may be utilized according to other embodiments. For example, it should be understood that, in certain example embodiments, apparatus 10 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 12 may represent a multiprocessor) that may support multiprocessing. According to certain example embodiments, the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster) .

Processor 12 may perform functions associated with the operation of apparatus 10 including, as some examples, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 10, including processes illustrated in FIGs. 1-9.

Apparatus 10 may further include or be coupled to a memory 14 (internal or external) , which may be coupled to processor 12, for storing information and instructions that may be executed by processor 12. Memory 14 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor- based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory. For example, memory 14 can be comprised of any combination of random access memory (RAM) , read only memory (ROM) , static storage such as a magnetic or optical disk, hard disk drive (HDD) , or any other type of non-transitory machine or computer readable media. The instructions stored in memory 14 may include program instructions or computer program code that, when executed by processor 12, enable the apparatus 10 to perform tasks as described herein.

In an embodiment, apparatus 10 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium. For example, the external computer readable storage medium may store a computer program or software for execution by processor 12 and/or apparatus 10 to perform any of the methods illustrated in FIGs. 1-9.

In some embodiments, apparatus 10 may also include or be coupled to one or more antennas 15 for receiving a downlink signal and for transmitting via an uplink from apparatus 10. Apparatus 10 may further include a transceiver 18 configured to transmit and receive information. The transceiver 18 may also include a radio interface (e.g., a modem) coupled to the antenna 15. The radio interface may correspond to a plurality of radio access technologies including one or more of GSM, LTE, LTE-A, 5G, NR, WLAN, NB-IoT, Bluetooth, BT-LE, NFC, RFID, UWB, and the like. The radio interface may include other components, such as filters, converters (for example, digital-to-analog converters and the like) , symbol demappers, signal shaping components, an Inverse Fast Fourier Transform (IFFT) module, and the like, to process symbols, such as OFDMA symbols, carried by a downlink or an uplink.

For instance, transceiver 18 may be configured to modulate information on to a carrier waveform for transmission by the antenna (s) 15 and demodulate information received via the antenna (s) 15 for further processing by other elements of apparatus 10. In other embodiments, transceiver 18 may be capable of transmitting and receiving signals or data directly. Additionally or alternatively, in some embodiments, apparatus 10 may include an input and/or output device (I/O device) . In certain embodiments, apparatus 10 may further include a user interface, such as a graphical user interface or touchscreen.

In an embodiment, memory 14 stores software modules that provide functionality when executed by processor 12. The modules may include, for example, an operating system that provides operating system functionality for apparatus 10. The memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 10. The components of apparatus 10 may be implemented in hardware, or as any suitable combination of hardware and software. According to an example embodiment, apparatus 10 may optionally be configured to communicate with apparatus 10 via a wireless or wired communications link 70 according to any radio access technology, such as NR.

According to certain example embodiments, processor 12 and memory 14 may be included in or may form a part of processing circuitry or control circuitry. In addition, in some embodiments, transceiver 18 may be included in or may form a part of transceiving circuitry.

As discussed above, according to certain example embodiments, apparatus 10 may be a UE for example. According to certain embodiments, apparatus 10 may be controlled by memory 14 and processor 12 to perform the functions associated with example embodiments described herein. For instance, in one embodiment, apparatus 10 may be controlled by memory 14 and processor 12 to receive a plurality of sets of power control parameters. Apparatus 10 may also be controlled by memory 14 and processor 12 to select a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme. Apparatus 10 may further be controlled by memory 14 and processor 12 to calculate a transmission power with the corresponding set of power control parameters. In addition, apparatus 10 may be controlled by memory 14 and processor 12 to apply the calculated transmission power to a communication with a network node with the retransmission scheme. Further, apparatus 10 may be controlled by memory 14 and processor 12 to determine the retransmission scheme based on semi-static or dynamic signaling.

FIG. 11 (b) illustrates an apparatus 20 according to an example embodiment. In an example embodiment, the apparatus 20 may be a radio resource manager, RAT, node, host, or server in a communication network or serving such a network. For example, apparatus 20 may be a base station, a Node B, an evolved Node B (eNB) , 5G Node B or access point, next generation Node B (NG-NB or gNB) , and/or WLAN access point, associated with a radio access network (RAN) , such as an LTE network, 5G or NR. It should be noted that one of ordinary skill in the art would understand that apparatus 20 may include components or features not shown in FIG. 11 (b) .

As illustrated in the example of FIG. 11 (b) , apparatus 20 may include a processor 22 for processing information and executing instructions or operations. Processor 22 may be any type of general or specific purpose processor. For example, processor 22 may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) , field-programmable gate arrays (FPGAs) , application-specific integrated circuits (ASICs) , and processors based on a multi-core processor architecture, as examples. While a single processor 22 is shown in FIG. 11 (b) , multiple processors may be utilized according to other embodiments. For example, it should be understood that, in certain embodiments, apparatus 20 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 22 may represent a multiprocessor) that may support multiprocessing. In certain embodiments, the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster.

According to certain example embodiments, processor 22 may perform functions associated with the operation of apparatus 20, which may include, for example, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 20, including processes illustrated in FIGS. 1-8 and 10.

Apparatus 20 may further include or be coupled to a memory 24 (internal or external) , which may be coupled to processor 22, for storing information and instructions that may be executed by processor 22. Memory 24 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory. For example, memory 24 can be comprised of any combination of random access memory (RAM) , read only memory (ROM) , static storage such as a magnetic or optical disk, hard disk drive (HDD) , or any other type of non-transitory machine or computer readable media. The instructions stored in memory 24 may include program instructions or computer program code that, when executed by processor 22, enable the apparatus 20 to perform tasks as described herein.

In an embodiment, apparatus 20 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium. For example, the external computer readable storage medium may store a computer program or software for execution by processor 22 and/or apparatus 20 to perform the methods illustrated in FIGs. 1-8 and 10.

In certain example embodiments, apparatus 20 may also include or be coupled to one or more antennas 25 for transmitting and receiving signals and/or data to and from apparatus 20. Apparatus 20 may further include or be coupled to a transceiver 28 configured to transmit and receive information. The transceiver 28 may include, for example, a plurality of radio interfaces that may be coupled to the antenna (s) 25. The radio interfaces may correspond to a plurality of radio access technologies including one or more of GSM, NB-IoT, LTE, 5G, WLAN, Bluetooth, BT-LE, NFC, radio frequency identifier (RFID) , ultrawideband (UWB) , MulteFire, and the like. The radio interface may include components, such as filters, converters (for example, digital-to-analog converters and the like) , mappers, a Fast Fourier Transform (FFT) module, and the like, to generate symbols for a transmission via one or more downlinks and to receive symbols (for example, via an uplink) .

As such, transceiver 28 may be configured to modulate information on to a carrier waveform for transmission by the antenna (s) 25 and demodulate information received via the antenna (s) 25 for further processing by other elements of apparatus 20. In other embodiments, transceiver 18 may be capable of transmitting and receiving signals or data directly. Additionally or alternatively, in some embodiments, apparatus 20 may include an input and/or output device (I/O device) .

In an embodiment, memory 24 may store software modules that provide functionality when executed by processor 22. The modules may include, for example, an operating system that provides operating system functionality for apparatus 20. The memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 20. The components of apparatus 20 may be implemented in hardware, or as any suitable combination of hardware and software.

According to some embodiments, processor 22 and memory 24 may be included in or may form a part of processing circuitry or control circuitry. In addition, in some embodiments, transceiver 28 may be included in or may form a part of transceiving circuitry.

As used herein, the term “circuitry” may refer to hardware-only circuitry implementations (e.g., analog and/or digital circuitry) , combinations of hardware circuits and software, combinations of analog and/or digital hardware circuits with software/firmware, any portions of hardware processor (s) with software (including digital signal processors) that work together to cause an apparatus (e.g., apparatus 10 and 20) to perform various functions, and/or hardware circuit (s) and/or processor (s) , or portions thereof, that use software for operation but where the software may not be present when it is not needed for operation. As a further example, as used herein, the term “circuitry” may also cover an implementation of merely a hardware circuit or processor (or multiple processors) , or portion of a hardware circuit or processor, and its accompanying software and/or firmware. The term circuitry may also cover, for example, a baseband integrated circuit in a server, cellular network node or device, or other computing or network device.

As introduced above, in certain embodiments, apparatus 20 may be a radio resource manager, RAT, node, host, or server in a communication network or serving such a network. For example, apparatus 20 may be a satellite, base station, a Node B, an evolved Node B (eNB) , 5G Node B or access point, next generation Node B (NG-NB or gNB) , and/or WLAN access point, associated with a radio access network (RAN) , such as an LTE network, 5G or NR. According to certain embodiments, apparatus 20 may be controlled by memory 24 and processor 22 to perform the functions associated with any of the embodiments described herein.

For instance, in one embodiment, apparatus 20 may be controlled by memory 24 and processor 22 to configure a UE with a plurality of sets of power control parameters. Apparatus 20 may also be controlled by memory 24 and processor 22 to indicate a retransmission scheme to the UE. Apparatus 20 may further be controlled by memory 24 and processor 22 to receive a communication from the user equipment with the retransmission scheme. In an example embodiment, the communication may be received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.

Certain example embodiments described herein provide several technical improvements, enhancements, and /or advantages. In some example embodiments, it may be possible to provide a new retransmission scheme based UL power control in NTN to support multiple types of retransmission schemes simultaneously. Such retransmission schemes may include dynamic HARQ disabling/HARQ enabling, as well as blind retransmission, etc., since different retransmission schemes have different UL transmission power requirements. According to certain example embodiments, the reasonable power values for different retransmission schemes may be set. Thus, it may be possible to adapt to different retransmission schemes with a small standard deviation effect/modification.

A computer program product may comprise one or more computer-executable components which, when the program is run, are configured to carry out some example embodiments. The one or more computer-executable components may be at least one software code or portions of it. Modifications and configurations required for implementing functionality of an example embodiment may be performed as routine (s) , which may be implemented as added or updated software routine (s) . Software routine (s) may be downloaded into the apparatus.

As an example, software or a computer program code or portions of it may be in a source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, distribution medium, or computer readable medium, which may be any entity or device capable of carrying the program. Such carriers may include a record medium, computer memory, read-only memory, photoelectrical and/or electrical carrier signal, telecommunications signal, and software distribution package, for example. Depending on the processing power needed, the computer program may be executed in a single electronic digital computer or it may be distributed amongst a number of computers. The computer readable medium or computer readable storage medium may be a non-transitory medium.

In other example embodiments, the functionality may be performed by hardware or circuitry included in an apparatus (e.g., apparatus 10 or apparatus 20) , for example through the use of an application specific integrated circuit (ASIC) , a programmable gate array (PGA) , a field programmable gate array (FPGA) , or any other combination of hardware and software. In yet another example embodiment, the functionality may be implemented as a signal, a non-tangible means that can be carried by an electromagnetic signal downloaded from the Internet or other network.

According to an example embodiment, an apparatus, such as a node, device, or a corresponding component, may be configured as circuitry, a computer or a microprocessor, such as single-chip computer element, or as a chipset, including at least a memory for providing storage capacity used for arithmetic operation and an operation processor for executing the arithmetic operation.

One having ordinary skill in the art will readily understand that the invention as discussed above may be practiced with steps in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, although the invention has been described based upon these example embodiments, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of example embodiments. Although the above embodiments refer to 5G NR and LTE technology, the above embodiments may also apply to any other present or future 3GPP technology, such as LTE-advanced, and/or fourth generation (4G) technology.

Partial Glossary

BLER Block Error Rate

DL Downlink

eNB Enhanced Node B

GEO Geostationary Earth Orbit Stationary Satellite

gNB 5G or NR Base Station

HAPS High Altitude Platform

LEO Low Earth Orbit Satellite

LTE Long Term Evolution

MEO Medium Earth Orbit Satellite

NGSO Non-GEO Stationary Orbit Systems/Satellites (i.e., LEO, MEO, and HAPS)

NR New Radio

NTN Non-Terrestrial Networks

QoS Quality-of-Service

SINR Signal-to-interference-plus-noise Ratio

UE User Equipment

UL Uplink

Claims

A method, comprising:

receiving, at a user equipment, a plurality of sets of power control parameters;

selecting a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme;

calculating a transmission power with the corresponding set of power control parameters; and

applying the calculated transmission power to a communication with a network node with the retransmission scheme.
The method according to claim 1, wherein the method further comprises determining the retransmission scheme based on semi-static or dynamic signaling.
The method according to claims 1 or 2, wherein the retransmission scheme comprises hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme.
The method according to any of claims 1-3, wherein the retransmission scheme comprises corresponding uplink transmission power requirements.
The method according to any of claims 1-4, wherein the plurality of sets of power control parameters comprises a different basic power setting P0 and path-loss compensation factor αfor different retransmission schemes.
The method according to any of claims 1-4, wherein the plurality of sets of power control parameters comprises P0 and αconfigured for one retransmission scheme and a power offset configured for other retransmission schemes.
The method according to any of claims 1-4, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for different HARQ processes that are configured with different retransmission schemes.
The method according to any of claims 1-4, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes.
The method according to any of claims 1-8, wherein the power control parameters are uplink power control parameters, and the transmission power is an uplink transmission power.
A method, comprising:

configuring, by a network node, a user equipment with a plurality of sets of power control parameters;

indicating a retransmission scheme to the user equipment; and

receiving a communication from the user equipment with the retransmission scheme,

wherein the communication is received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.
The method according to claim 10, wherein the indication of the retransmission scheme is performed semi-statically or dynamically.
The method according to claims 10 or 11, wherein the retransmission scheme comprises hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme.
The method according to any of claims 10-12, wherein the retransmission scheme comprises corresponding uplink transmission power requirements.
The method according to any of claims 10-13, wherein the plurality of sets of power control parameters comprises a different basic power setting P0 and path-loss compensation factor αfor different retransmission schemes.
The method according to any of claims 10-13, wherein the plurality of sets of power control parameters comprises P0 and αconfigured for one retransmission scheme and a power offset configured for other retransmission schemes.
The method according to any of claims 10-13, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for different HARQ processes that are configured with different retransmission schemes.
The method according to any of claims 10-13, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes.
An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

the at least one memory and the computer program code are configured, with the at least one processor to cause the apparatus at least to

receive a plurality of sets of power control parameters;

select a corresponding set of power control parameters from the plurality of sets of power control parameters based on a retransmission scheme;

calculate a transmission power with the corresponding set of power control parameters; and

apply the calculated transmission power to a communication with a network node with the retransmission scheme.
The apparatus according to claim 18, wherein the at least one memory and the computer program code are further configured, with the at least one processor to cause the apparatus at least to determine the retransmission scheme based on semi-static or dynamic signaling.
The apparatus according to claims 18 or 19, wherein the retransmission scheme comprises hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme.
The apparatus according to any of claims 18-20, wherein the retransmission scheme comprises corresponding uplink transmission power requirements.
The apparatus according to any of claims 18-21, wherein the plurality of sets of power control parameters comprises a different basic power setting P0 and path-loss compensation factor α for different retransmission schemes.
The apparatus according to any of claims 18-21, wherein the plurality of sets of power control parameters comprises P0 and αconfigured for one retransmission scheme and a power offset configured for other retransmission schemes.
The apparatus according to any of claims 18-21, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for different HARQ processes that are configured with different retransmission schemes.
The apparatus according to any of claims 18-21, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes.
The apparatus according to any of claims 18-25, wherein the power control parameters are uplink power control parameters, and the transmission power is an uplink transmission power.
An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

the at least one memory and the computer program code are configured, with the at least one processor to cause the apparatus at least to

configure a user equipment with a plurality of sets of power control parameters;

indicate a retransmission scheme to the user equipment; and

receive a communication from the user equipment with the retransmission scheme,

wherein the communication is received according to a calculated transmission power based on a corresponding set of power control parameters for the retransmission scheme.
The apparatus according to claim 27, the indication of the retransmission scheme is performed semi-statically or dynamically.
The apparatus according to claims 27 or 28, wherein the retransmission scheme comprises hybrid automatic repeat request (HARQ) disabling, HARQ enabling, blind retransmissions, or other retransmission scheme.
The apparatus according to any of claims 27-29, wherein the retransmission scheme comprises corresponding uplink transmission power requirements.
The apparatus according to any of claims 27-30, wherein the plurality of sets of power control parameters comprises a different basic power setting P0 and path-loss compensation factor α for different retransmission schemes.
The apparatus according to any of claims 27-30, wherein the plurality of sets of power control parameters comprises P0 and αconfigured for one retransmission scheme and a power offset configured for other retransmission schemes.
The apparatus according to any of claims 27-30, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for different HARQ processes that are configured with different retransmission schemes.
The apparatus according to any of claims 27-30, wherein the plurality of sets of power control parameters comprises different P0 and αconfigured for a certain number of HARQ processes that are configured with one retransmission scheme, and a certain number of power offsets are configured for other HARQ processes that are configured with other retransmission schemes.
An apparatus, comprising:

means for performing at least the method according to any of claims 1-17.
An apparatus, comprising:

circuitry configured to cause the apparatus to perform at least the method according to any of claims 1-17.
A computer readable medium comprising program instructions stored thereon for performing at least the method according to any of claims 1-17.