Apparatus and method for using different linearly dependent optimal maximum power reduction values ​​for different bandwidth groups - Patents.com

Abstract

1. An apparatus comprising at least one processor and at least one memory storing instructions that, when executed using the at least one processor, cause the apparatus to: determine a channel bandwidth; and, based on the determined channel bandwidth, determine a maximum power reduction for the channel bandwidth using the value of the channel bandwidth as a value in an equation.

Description

[Technical field]

[0001] FIELD The exemplary and non-limiting embodiments relate generally to wireless communications, and more particularly to reducing power during wireless transmissions. [Background technology]

[0002] It is known that higher order modulation and transmission bandwidth configurations reduce the maximum output power of user equipment. Summary of the Invention

[0003] The following summary is intended to be merely an example and is not intended to limit the scope of the claims.

[0004] According to one aspect, an exemplary apparatus is provided that includes at least one processor and at least one memory that stores instructions that, when executed using the at least one processor, cause the apparatus to perform: determining a channel bandwidth; and determining a maximum power reduction for the channel bandwidth based on the determined channel bandwidth, using the value of the channel bandwidth as a value in an equation.

[0005] According to other aspects, an example method may be provided that includes determining a channel bandwidth and determining a maximum power reduction for the channel bandwidth based on the determined channel bandwidth using the value of the channel bandwidth as a value in an equation.

[0006] According to another aspect, an exemplary embodiment may be provided having a non-transitory computer readable medium including program instructions that, when executed with an apparatus, cause the apparatus to at least determine which channel bandwidth group, from at least two channel bandwidth groups, a channel bandwidth is associated with, and select an equation, from a plurality of equations, based on the determined channel bandwidth group.

[0007] According to other aspects, an example apparatus may be provided that includes means for determining which channel bandwidth group a channel bandwidth is associated with from at least two channel bandwidth groups, and means for selecting a formula from a plurality of formulas based on the determined channel bandwidth group.

[0008] According to other aspects, an exemplary apparatus may be provided that includes at least one processor and at least one memory that stores instructions that, when executed using the at least one processor, cause the apparatus to perform a first test of performance of the apparatus using a first channel bandwidth in a first channel bandwidth group to test a maximum power reduction allowed, the first channel bandwidth being a highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0009] According to another aspect, an exemplary method may be provided that includes a first test of performance of an apparatus using a first channel bandwidth in a first channel bandwidth group to test a maximum power reduction allowed, the first channel bandwidth being a highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0010] According to another aspect, an exemplary embodiment may be provided having a non-transitory computer readable medium including program instructions that, when executed with an apparatus, cause the apparatus to perform at least a first test of performance of the apparatus using a first channel bandwidth in a first channel bandwidth group to test a maximum power reduction allowed, the first channel bandwidth being a highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0011] According to another aspect, an exemplary apparatus may be provided that includes means for performing a first test of performance of the apparatus using a first channel bandwidth in a first channel bandwidth group for testing a maximum power reduction allowed, the first channel bandwidth being a highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0012] According to some aspects, the subject matter of the independent claims is provided. Further aspects are provided in the subject matter of the dependent claims.

[0013] The foregoing aspects and other features are explained in the following description taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a block diagram of one possible, non-limiting, example system in which example embodiments may be implemented. [Diagram 2] 1 is a table showing an example of maximum power reduction (MPR) for Power Class 1 of the specification. [Diagram 3] 1 is a table showing an example of a generic NR spectrum emission mask for a specification. [Figure 4] 1 is a chart showing a test sample example of maximum SEM limit backoff in decibels versus channel bandwidth in MHz. [Diagram 5] 5 is a chart similar to FIG. 4 but including reference lines to illustrate one aspect of how MPR may be defined as a function of channel bandwidth. [Figure 6] 13 is a chart showing a test sample example of maximum L CRB as a function of channel bandwidth. [Figure 7] 13 is a table showing an example of a test configuration table for power class 1 (contiguous allocation) of band n14 of the specification. [Figure 8] 1 is a table showing an example of maximum power reduction (MPR) for Power Class 1 of the specification. [Figure 9A-9B](Also shown in FIG. 9) is a table showing an example of a table regarding UE power class test requirements for bands other than band n14 of power class 1 (contiguous allocation) of the specification. [Figure 10] FIG. 2 illustrates an exemplary method of an exemplary embodiment. [Figure 11] FIG. 2 illustrates an exemplary method of an exemplary embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following abbreviations that may appear in the specification and / or drawings are defined as follows: 3GPP 3rd Generation Partnership Project 5G 5th Generation 5GC 5G Core Network AMF Access and Mobility Management Functions BB Baseband CU Central Unit DL Downlink DU Distributed Unit eNB (or eNodeB) Evolved Node B (e.g. LTE base station) EN-DC E-UTRA-NR dual connectivity A node that provides NR user plane and control plane protocol termination for en-gNB or En-gNB UE and acts as a secondary node for EN-DC E-UTRA Evolved Universal Terrestrial Radio Access, i.e. LTE radio access technology FDD Frequency Division Duplex FR Frequency Range gNB (or gNodeB) A base station for 5G / NR, i.e. a node that provides NR user plane and control plane protocol termination for UE and is connected to 5GC via the NG interface. I / F Interface LTE Long Term Evolution MAC Media Access Control MME Mobility Management Entity MPR Maximum Power Reduction ng or NG Next Generation ng-eNB or NG-eNB Next Generation eNB NR New Radio N / W or NW Network PC Power Class PDCP Packet Data Convergence Protocol PHY Physical Layer RAN Radio Access Network RB Resource Block Rel Release RF Radio Frequency RLC Radio Link Control RRH Remote Radio Head RRC Radio Resource Control RU Radio Unit Rx Receiver SDAP Service Data Adaptation Protocol SEM Spectrum Emission Mask SGW Serving Gateway SMF Session Management Facility TDD Time Division Duplex TS Technical Specifications Tx transmitter UE User Equipment (e.g., wireless device, typically a mobile device) UL Uplink UPF User Plane Function WI work item

[0016] Turning to FIG. 1, this figure shows a block diagram of one possible and non-limiting example in which embodiments may be implemented. Shown is a user equipment (UE) 110, a radio access network (RAN) node 170, and a network element(s) 190. In the example of FIG. 1, the user equipment (UE) 110 wirelessly communicates with a wireless network 100. The UE is a wireless device that can access the wireless network 100. The UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130, which are interconnected via one or more buses 127. Each of the one or more transceivers 130 includes a receiver Rx 132 and a transmitter Tx 133. The one or more buses 127 may be an address bus, a data bus, or a control bus, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, and optical fibers or other optical communication facilities. The one or more transceivers 130 are connected to one or more antennas 128. The one or more memories 125 include computer program code 123. The UE 110 includes a module 140 comprising one or both of portions 140-1 and / or 140-2, which may be implemented in numerous ways. The module 140 may be implemented in hardware as module 140-1 implemented as part of one or more processors 120. The module 140-1 may also be implemented as an integrated circuit or via other hardware such as a programmable gate array. In other examples, the module 140 may be implemented as module 140-2 implemented as computer program code 123 and executed by one or more processors 120. For example, the one or more memories 125 and the computer program code 123, together with the one or more processors 120, may be configured to cause the user equipment 110 to perform one or more of the operations described herein. The UE 110 communicates with the RAN node 170 via a wireless link 111.

[0017] The RAN node 170 in this example is a base station that provides access to the wireless network 100 by wireless devices such as the UE 110. The RAN node 170 may be, for example, a base station for 5G, also referred to as New Radio (NR). In 5G, the RAN node 170 may be an NG-RAN node, defined as either a gNB or an ng-eNB. A gNB is a node that provides NR user plane and control plane protocol terminations for the UE and is connected to the 5GC (e.g., network element(s) 190) via an NG interface. A ng-eNB is a node that provides E-UTRA user plane and control plane protocol terminations for the UE and is connected to the 5GC via an NG interface. An NG-RAN node may include multiple gNBs, which may also include a central unit (CU) (gNB-CU) 196 and distributed unit(s) (DU) (gNB-DU), of which DU 195 is shown. It should be noted that a DU may include a radio unit (RU) or may be coupled to a RU to control the RU. The gNB-CU is a logical node that hosts the RRC, SDAP, and PDCP protocols of the gNB or the RRC and PDCP protocols of the en-gNB that controls the operation of one or more gNB-DUs. The gNB-CU terminates the F1 interface connected to the gNB-DU. The F1 interface is shown as reference number 198, which also shows the link between the remote elements of the RAN node 170 and the centralized elements of the RAN node 170, e.g., between the gNB-CU 196 and the gNB-DU 195. The gNB-DU is a logical node that hosts the RLC, MAC, and PHY layers of the gNB or en-gNB, and its operation is partially controlled by the gNB-CU. One gNB-CU supports one or more cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the F1 interface 198 connected to the gNB-CU.It should be noted that while the DU 195 is considered to include the transceiver 160, e.g., as part of an RU, some examples of this may have the transceiver 160 as part of another RU, e.g., under the control of and connected to the DU 195. The RAN node 170 may also be an eNB (Evolved NodeB) base station for Long Term Evolution (LTE), or any other suitable base station or node.

[0018] The RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N / WI / F(s)) 161, and one or more transceivers 160, which are interconnected via one or more buses 157. Each of the one or more transceivers 160 includes a receiver Rx 162 and a transmitter Tx 163. The one or more transceivers 160 are connected to one or more antennas 158. The one or more memories 155 include computer program code 153. The CU 196 may include the processor(s) 152, the memory 155, and the network interface 161. It should be noted that the DU 195 may also include its own memory / memories and processor(s), and / or other hardware, which are not shown.

[0019] The RAN node 170 includes a module 150 comprising one or both of the portions 150-1 and / or 150-2, which may be implemented in a number of ways. The module 150 may be implemented in hardware as a module 150-1 implemented as part of one or more processors 152. The module 150-1 may also be implemented as an integrated circuit or via other hardware such as a programmable gate array. In another example, the module 150 may be implemented as a module 150-2 implemented as a computer program code 153 and executed by one or more processors 152. For example, the one or more memories 155 and the computer program code 153, together with the one or more processors 152, are configured to cause the RAN node 170 to perform one or more of the operations described herein. It should be noted that the functionality of the module 150 may be distributed, e.g., distributed between the DU 195 and the CU 196, or implemented only in the DU 195.

[0020] One or more network interfaces 161 communicate over a network, such as via links 176 and 131. Two or more gNBs 170 may communicate, for example, using link 176. Link 176 may be wired, wireless, or both, and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interfaces for other standards.

[0021] The one or more buses 157 may be an address bus, a data bus, or a control bus and may include any interconnection mechanism, e.g., a series of lines on a motherboard or integrated circuit, optical fiber or other optical communication facilities, radio channels, etc. For example, the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195 for LTE, or a distributed unit (DU) 195 for a gNB implementation for 5G, and other elements of the RAN node 170 may be in a different physical location than the RRH / DU, and the one or more buses 157 may be implemented in part, e.g., as optical fiber cables or other suitable network connections to connect other elements of the RAN node 170 (e.g., a central unit (CU), gNB-CU) to the RRH / DU 195. Reference numeral 198 also indicates those suitable network link(s).

[0022] It should be noted that although the description herein indicates that a "cell" performs a function, it is clear that the equipment forming the cell performs the function. A cell forms part of a base station. That is, there may be multiple cells per base station. For example, there may be three cells for a single carrier frequency and associated bandwidth, each cell covering one-third of a 360 degree area, such that the coverage area of ​​a single base station covers approximately an ellipse or circle. Furthermore, each cell may correspond to a single carrier, and a base station may use multiple carriers. Thus, if there are three 120 degree cells per carrier and there are two carriers, the base station has a total of six cells.

[0023] The wireless network 100 may include a network element or elements 190 that may include a core network function, which provides connectivity via a link or links 181 with further networks, such as a telephone network and / or a data communication network (e.g., the Internet). Such core network functions for 5G may include access and mobility management function(s) (AMF(s)), and / or user plane function (UPF(s)), and / or session management function(s) (SMF(s)). Such core network functions for LTE may include MME (Mobility Management Entity) / SGW (Serving Gateway) functions. It should be noted that these are merely exemplary functions that may be supported by the network element(s) 190, and that both 5G and LTE functions may be supported. The RAN node 170 is coupled to the network element 190 via a link 131. The link 131 may be implemented, for example, as an NG interface for 5G, an S1 interface for LTE, or other suitable interface for other standards. Network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N / WI / F(s)) 180, interconnected via one or more buses 185. The one or more memories 171 include computer program code 173. The one or more memories 171 and the computer program code 173, together with the one or more processors 175, are configured to cause network element 190 to perform one or more operations.

[0024] The wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functions to create a single software-based management entity, a virtual network. Network virtualization involves platform virtualization, which is often combined with resource virtualization. Network virtualization is classified as either external network virtualization, which combines multiple networks or network parts to create a virtual unit, or internal network virtualization, which provides network-like functionality to software containers on a single system. It should be noted that the virtualized entities resulting from network virtualization are further implemented at some level using hardware, such as the processor 152 or 175 and memory 155 and 171, and that such virtualized entities produce technical effects.

[0025] The computer readable memories 125, 155, and 171 may be of any type suitable for the local technology environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 125, 155, and 171 may be a means for performing storage functions. The processors 120, 152, and 175 may be of any type suitable for the local technology environment and may include, by way of non-limiting examples, one or more of a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. The processors 120, 152, and 175 may be a means for performing functions, such as control of the UE 110, the RAN node 170, and other functions described herein.

[0026] In general, various embodiments of user equipment 110 may include, but are not limited to, cellular telephones such as smartphones, tablets, personal digital assistants (PDAs) with wireless communication capabilities, portable computers with wireless communication capabilities, image capture devices such as digital cameras with wireless communication capabilities, gaming devices with wireless communication capabilities, music storage and playback devices with wireless communication capabilities, Internet appliances allowing wireless Internet access and browsing, tablets with wireless communication capabilities, and portable units or terminals incorporating a combination of such functions.

[0027] In RAN4, 3GPP WI on high power UE operation for fixed wireless / vehicle use cases in LTE and NR bands is ongoing. One of the topics being discussed is the maximum power reduction (MPR) allowed for UE PC1 when the UL RB allocation is at or close to the UL channel bandwidth edge.

[0028] Traditionally, a UE is allowed to reduce its maximum output power due to higher order modulation and transmission bandwidth configuration. For UE PC1, the allowed MPR is specified in Table 6.2.2-5 of TS38.101-1 shown in FIG. 2, where the MPRs of edge RB allocations related to the features described herein are highlighted at 202 and 204. An edge RB allocation is specified as an RB allocation located at (or near) either channel edge and whose allocation size does not exceed a specified maximum value. Currently, UE PC1 is specified only for NR band n14 for public safety operations (e.g., can be found in Table 6.2.1-1 of TS38.101-1), and ongoing 3GPP WI aims to specify UE PC1 for other NR bands.

[0029] It is discussed in R4-2214048 and shown by the simulation results in R4-2216044 that there are problems with applying the edge RB allocation and MPR in Table 6.2.2-5 of TS38.101-1 to UE PC1 in other NR bands. As a result, the following was agreed in RAN4#104-e in R4-2214432. If PC1 MPR needs to represent implementation using BB and RF transceivers on smartphone platforms, the addition of an edge allocation type with a minimum MPR of 8.5 dB and an edge region of 7 RB should be considered. It may be feasible to agree on a slightly better value of 8 dB or to add signaling for the UE to declare the need for this additional allocation type.

[0030] In addition, the following was agreed in RAN4#104-bis-e of R4-2217116: · A set of edge RB allocations is defined to allow higher MPR for the RB allocations limited by SEM due to linear spectral regrowth due to the window effect, except for band n14 MPR which is kept as is. · At the next meeting, we will further discuss whether and how to make the PC1 MPR for edge RB allocation dependent on the channel bandwidth, with a maximum MPR of 8.5 dB. · At the next meeting, we will further discuss whether and how to prescribe a set of edge RB allocations depending on the channel bandwidth.

[0031] Therefore, it is still necessary to define edge RB allocations and allowed MPR values ​​for UE PC1 in other NR bands.

[0032] Regarding the acceptable MPR, in the email discussion in RAN4#104-bis-e (see R4-2217767), it was suggested that “only <50 MHz (most FDD) and >50 MHz (some TDD) may be sufficient.” This suggestion is based on the fact that Table 6.5.2.2-1 of TS38.101-1 specifies different generic NR spectrum emission mask limits for channel bandwidths <50 MHz and >50 MHz, which are shown in the annotated Figure 3, with the different limits highlighted in 302 and 304, and therefore it is proposed to specify two sets of edge RB allocations and corresponding acceptable MPR values, one set for channel bandwidths less than 50 MHz (<50 MHz) and another set for channel bandwidths ≥ 50 MHz (≥ 50 MHz).

[0033] The features described herein may be used with respect to defining edge RB allocations and allowed MPR values ​​for UE PC1 in NR bands other than n14.

[0034] Also referring to Figure 4, it is shown that the power back-off required to meet the generic NR spectrum emission mask limit varies with channel bandwidth. For example, a channel bandwidth of ≥ 50 MHz will require a higher power back-off than a channel bandwidth of < 50 MHz. This is due to the tighter -24 dBm limit 308 compared to the -13 dBm limit 306 at 0 to 1 MHz outside the channel bandwidth as specified in Table 6.5.2.2-1 of TS38.101-1, as seen with reference to Figure 3. Figure 4 shows the SEM limit back-off values ​​as a function of channel bandwidth.

[0035] If the proposal to specify only one allowable MPR value for the <50 MHz channel bandwidth group and only one allowable MPR value for the ≧50 MHz channel bandwidth group is adopted, the allowable MPR would need to be 6.5 dB and 8.5 dB for the <50 MHz channel bandwidth group and the ≧50 MHz channel bandwidth group, respectively, to cover all channel bandwidths within the corresponding (<50 MHz and ≧50 MHz) groups.

[0036] However, from Figure 4, it can be seen that the power back-off required to meet the generic NR spectrum emission mask limit also varies with the channel bandwidth within each group (<50 MHz and ≥50 MHz). Intermediate channel bandwidths require lower power back-off than lower channel bandwidths in the <50 MHz group. Intermediate channel bandwidths require lower power back-off than higher channel bandwidths in the ≥50 MHz group. For example, a 45 MHz channel bandwidth requires 2 dB less power back-off than a 5 MHz channel bandwidth, and a 50 MHz channel bandwidth requires 2 dB less power back-off than a 100 MHz channel bandwidth. This is explained by the guard-to-SCS ratio (minimum guard band width to subcarrier spacing ratio). Below a 50 MHz channel bandwidth, this guard-to-SCS ratio increases primarily with channel bandwidth. However, above 50 MHz, the guard-to-SCS ratio decreases with increasing channel bandwidth. The width of the linear spectral regrowth due to windowing is proportional to the subcarrier spacing (SCS). Therefore, the higher the guard-to-SCS ratio, the lower the required MPR. The minimum guard band width for each combination of channel bandwidth and SCS is specified in Table 5.3.3-1 of TS38.101-1. Therefore, adopting the proposal to specify the allowable MPR value using a common value for all channel bandwidths in the <50 group and a common value for all channel bandwidths in the ≥50 group would result in a power backoff of 2 dB more than necessary, resulting in a UL coverage loss of 2 dB.

[0037] Referring also to FIG. 5, the "◯" represents a number of samples taken at 5, 10, 15, 20, 25, 30, 40, and 45 MHz, respectively, for <50 MHz. The "*" represents a number of samples taken at 50, 60, 70, 80, 90, and 100 MHz, respectively, for ≧50 MHz. Regression lines 502, 504 can be plotted for each (<50 MHz and ≧50 MHz) group, and it can be seen that the required power backoff changes or varies as a function of channel bandwidth. As shown in line 502, the power backoff may decrease linearly for the <50 MHz group. For example, the power backoff may decrease for a channel bandwidth of 45 compared to a channel bandwidth of 10. As shown in line 504, the power backoff may increase linearly for the ≧50 MHz group. For example, the power backoff may increase for a channel bandwidth of 90 compared to a channel bandwidth of 60. Therefore, in order to not tolerate more MPR than necessary, in one example, it is proposed that the channel bandwidth can be divided into channel bandwidth groups (e.g., two groups: <50 MHz and ≧50 MHz), and the allowable MPR value in each channel bandwidth group can be defined by a formula. Therefore, there can be a different formula for each group. Below are two example formulas, one for each of the above two exemplary groups. 1. Within the first group (<50MHz channel bandwidth group),

number

number

[0038] In the above formula, CBW is the channel bandwidth, e.g., 10 MHz, 20 MHz, 30 MHz, etc. Note that the specific dB values ​​in the formula (7.2, 6, 5.35, 3.15) are only examples, and other values ​​may be used. These types of formulas allow the allowable MRP values ​​to be defined as a linear function of the channel bandwidth. Some sample results from the above exemplary formula are as follows: When CBW=10, the allowable MPR is changed to the following value: =7.2dB-6dB(10 / 100) =7.2-0.6 =6.6dB When CBW=30, the allowable MPR is changed to the following value: =7.2dB-6dB(30 / 100) =7.2-1.8 =5.4dB When CBW=60, the allowable MPR is changed to the following value: =5.35dB+3.15dB(60 / 100) =5.35+1.89 =7.24dB When CBW=100, the allowable MPR is changed to: =5.35dB+3.15dB(100 / 100) =5.35+3.15 =8.5dB

[0039] Again, these are merely examples and should not be considered limiting. The line 502 may be determined by comparing the highest value of each CBW sample (corresponding to different waveforms and modulations) and selecting two CBWs such that the line 502 between the two CBWs is greater than the highest value of the other CBWs in the group. In the example shown in Figure 5, the two CBWs selected are 10 MHz and 45 MHz. The slope of the line 502 may then be determined. The slope is then used to determine the values ​​of "7.2" and "6" in the sample. Or, in other words, The first equation is:

number

number

[0040] For the first equation, this is the equation of a straight line, where A is the selected point on line 502, and B is the slope. Therefore, only B is determined based on the slope, and A is determined based on the highest point of the 0 MHz CBW. For the second equation, this is also the equation of a straight line, where Y is the slope of line 504, and X is determined based on the highest point of the 100 MHz CBW and the slope of the line (X is the value at the 0 MHz CBW if line 504 were extended to the 0 MHz CBW).

[0041] It should be noted that these formulas are merely examples. Any suitable formula will work as long as the correct formula is selected for each group and the selected formula modifies or changes the allowable MPR as a function or based on the CBW. In alternatives, more or less than two groups may be provided. For example, <20 MHz may be included in one group and another group may include ≧20 MHz to <50 MHz. In one type of alternative, a group may consist of only one CBW, for example, only 10 MHz. In one example, one formula is used for only one group. In another example, one formula is used for more than one group. Thus, two groups may use the same formula. In alternatives, the line need not be straight and have a uniform slope, the line may be curved. In this alternative, the formula may be based on the curvature of the line relative to the CBW.

[0042] Regarding the edge RB allocation specification, as described in R4-2216044 and shown in Figure 6, the maximum edge RB allocation that requires a higher power backoff to meet the generic NR spectrum emission mask limit also varies with channel bandwidth, with ≥50 MHz channel bandwidths requiring a larger edge RB allocation than <50 MHz channel bandwidths, again due to the tighter limit of -24 dBm (compared to -13 dBm) at 0-1 MHz outside the channel bandwidth, as specified in Table 6.5.2.2-1 of TS38.101-1. Here, there is no regression line as seen in the power backoff figure above. Therefore, the proposal discussed in RAN4#104-bis-e to specify two edge RB allocation sizes (one for <50 MHz channel bandwidths and another for ≥50 MHz channel bandwidths) seems reasonable. 7, for UE PC1 in NR band n14, the acceptable MPR may be tested using the minimum and maximum channel bandwidths supported by the UE as required in Table 6.2.2.4.1-2a of TS38.521-1 and the test channel bandwidths 702 associated with the features described herein. For UE PC1 in other NR bands, to test the UE's performance in each (<50 MHz and ≧50 MHz) channel bandwidth group, the test may include testing the acceptable MPR for the maximum channel bandwidth <50 MHz and minimum channel bandwidth ≧50 MHz supported by the UE in addition to the currently required minimum and maximum channel bandwidths supported by the UE. This may help ensure that the UE provides sufficient performance in all supported channel bandwidths in the two channel bandwidth groups.

[0043] Thus, the test may include both: 1. the currently required minimum and maximum bandwidth supported by the UE; and 2. a new test of the acceptable MPR for the maximum channel bandwidth supported by the UE <50 MHz and the minimum channel bandwidth >= 50 MHz. Thus, two additional test points may be provided: Mid-Low <50 MHz, Mid-High >= 50 MHz. However, it should be noted that in some operating bands, only channel bandwidths <50 MHz are specified. Thus, the test may be provided only for that one group.

[0044] The features described herein may be implemented in TS38.101-1 by making the following, for example, changes: As shown in Figure 8, a note regarding the applicability of n14 may be added to Table 6.2.2-5 and the following text may be included in 6.2.2 UE maximum output power reduction: To specify the valid RB allocation range for the Outer and Inner RB allocations, the following parameters are defined: N RB is the maximum number of RBs for a given channel bandwidth and subcarrier spacing as specified in Table 5.3.2-1. R.B. Start,Low =max(1,floor(L CRB / 2)) Here, max() denotes the maximum value of all arguments, and floor(x) is the largest integer less than or equal to x. R.B. Start,High =N RB -RB Start,Low -L CRB If the following conditions are met, the RB allocation is internal RB allocation. R.B. Start,Low ≦RB Start ≦RB Start,High ,and, L CRB ≦ceil(N RB / 2) Here, ceil(x) is the smallest integer greater than or equal to x. Edge RB allocation is CRB This is an allocation in which RB(s) are allocated at the bottom or top of a channel with ≦2RBs. For PC1 UEs supporting bands other than n14, the MPR of edge RB allocation is defined as follows for two different channel bandwidth groups: Within the <50MHz channel bandwidth group,

number

number

number

number

[10] . For these nearly continuous signals of power classes 2 and 3, the maximum allowed power reduction specified in Tables 6.2.2-2 and 6.2.2-1 is: CEIL{10log 10 (1+N RB_gap / N RB_alloc ),0.5}dB where CEIL{x,0.5} means rounding x up to the nearest 0.5 dB. Start,Low and R.B. Start,High The parameters are defined as follows: R.B. Start,Low =max(1,floor((N RB_alloc +N RB_gap ) / 2)) R.B. Start,High =N RB -RB Start,Low -N RB_alloc -N RB_gap The power limitations specified in subclause 6.2.4 apply to the UE maximum output power changed by the MPR.

[0045] In TS38.508-1, features that may be implemented include the following: 4.3.1 Test frequencies Editor's Note: n7(Medium:25MHz, High:50MHz), n8(High:35MHz), n25(High:45MHz), n40(High:100MHz), n65(High:50MHz), n66(High:45MHz), n71(High:35MHz), n75(High:50MHz), n79(Low:10MHz, RedCap:20MHz, 10MHz), and n80(High:40MHz) are not currently included in the Test Channel Bandwidth Table because the test frequencies have not yet been specified. and 4.3.1.0F Medium-Low Test Channel Bandwidth The mid-low test channel bandwidth definitions for RF are given in Table 4.3.1.0F-1 for FR1. [Table 1-1] [Table 1-2] 4.3.1.0G Medium-High Test Channel Bandwidth The high test channel bandwidth specifications for RF are given in Table 4.3.1.0G-1 for FR1. [Table 2-1] [Table 2-2] [Table 2-3] NOTE 1 (Informative): If the values ​​listed in the above table are higher than the values ​​signaled by the UE in supportedBandwidthDL / supportedBandwidthUL, the values ​​signaled by the UE in supportedBandwidthDL / supportedBandwidthUL shall be used in single carrier operation instead of the values ​​listed in Table 4.3.1.0C-1, to provide some flexibility for the Rel-15 and Rel-16 ecosystem.

[0046] In TS38.521-1, features that may be implemented include the following: 6.2.2 UE maximum output power reduction 6.2.2.1 Purpose of the Test The number of RBs shown in Table 6.2.2.3-1 is based on meeting the requirements for adjacent channel leakage ratio and maximum power reduction (MPR) with cubic metric (CM). 6.2.2.2 Applicability of Tests The requirements for this test apply to all types of NR Power Class 3 UE Release 15 and later and NR Power Class 1 UE Release 15 and later in NR band n14. The requirements for this test apply to all types of NR Power Class 2 UE that do not support txDiversity-r16 Release 15 or later. Note: If TS38.521-1 6.5.2.4.1 is performed, no test needs to be performed. 6.2.2.3 Minimum Conformance Requirements The UE is allowed to reduce its maximum output power due to higher order modulation and transmission bandwidth configuration. For UE power classes 2 and 3 and UE power class 1 with n14, for channel bandwidths less than or equal to 100 MHz, the allowed maximum power reduction (MPR) is shown in Tables 6.2.2.3-2, 6.2.2.3-1, and 6.2.2.3-5, respectively. and Table 6.2.2.3-5a It is stipulated in. If the relative channel bandwidth is less than or equal to 4% in the TDD band or less than or equal to 3% in the FDD band, ΔMPR is set to zero. When the relative channel bandwidth is greater than 4% in the TDD band or greater than 3% in the FDD band, ΔMPR is specified in Table 6.2.2.3-3. Where: relative channel bandwidth = 2*BW Channel / (F UL_low +F UL_high ). The allowed MPR for SRS, PUCCH formats 0, 1, 3, and 4, and PRACH are as specified for QPSK modulated DFT-s-OFDM with equal RB allocation. The allowed MPR for PUCCH format 2 is as specified for QPSK modulated CP-OFDM with equal RB allocation. and [Table 3-1] [Table 3-2] To specify the valid RB allocation range for the outer and inner RB allocations, the following parameters are defined: N RB is the maximum number of RBs for a given channel bandwidth and subcarrier spacing as specified in Table 5.3.2-1. R.B. Start,Low =max(1,floor(L CRB / 2)) Here, max() denotes the maximum value of all arguments, and floor(x) is the largest integer less than or equal to x. R.B. Start,High =N RB -RB Start,Low -L CRB If the following conditions are met, the RB allocation is internal RB allocation. R.B. Start,Low ≦RB Start ≦RB Start,High ,and, L CRB ≦ceil(N RB / 2) Here, ceil(x) is the smallest integer greater than or equal to x. Edge RB allocation is CRB This is an allocation in which RB(s) are allocated at the bottom or top of a channel with ≦2RBs. The RB allocation is an outer RB allocation with respect to all other allocations that are neither an inner RB allocation nor an edge RB allocation. A CP-OFDM allocation is considered to be near-contiguous if it satisfies the following conditions: N RB_gap / (N RB_alloc +N RB_gap )≦0.25 Also, N RB_alloc +N RB_gap is greater than 106RB, 51RB, or 24RB for 15kHz, 30kHz, or 60kHz SCS, respectively, where N RB_gap is the total number of unallocated RBs among the allocated RBs, and N RB_alloc is the total number of allocated RBs. The size and location of the allocated and unallocated RBs are limited by the RBG parameters specified in subclause 6.1.2.2 of TS 38.214

[12] . For these nearly continuous signals of power classes 2 and 3, the maximum allowed power reduction specified in Tables 6.2.2.3-2 and 6.2.2.3-1 is: CEIL{10log 10 (1+N RB_gap / N RB_alloc ),0.5}dB where CEIL{x,0.5} means rounding x up to the nearest 0.5 dB. Start,Low and R.B. Start,High The parameters are defined as follows: R.B. Start,Low =max(1,floor((N RB_alloc +N RB_gap ) / 2)) R.B. Start,High =N RB -RB Start,Low -N RB_alloc -N RB_gap The power limitations specified in subclause 6.2.4 shall apply to the maximum output power of the UE as changed by the MPR. The normative reference for this requirement is TS 38.101-1[2] clause 6.2.2. 6.2.2.4 Test Description 6.2.2.4.1 Initial conditions The initial conditions are the set of test configurations that the UE needs to be tested against, and the steps that the SS will perform to reach the correct measurement state with the UE. The initial test configuration consists of the environmental conditions, test frequencies, channel bandwidths, and subcarrier spacing based on the NR operating bands specified in Table 5.3.5-1. All these configurations shall be tested using the applicable test parameters for each combination of test channel bandwidth and subcarrier spacing, as specified in Tables 6.2.2.4.1-1, 6.2.2.4.1-2, 6.2.2.4.1-2a, 6.2.2.4.1-2b, 6.2.2.4.1-2c, 6.2.2.4.1-2d, 6.2.2.4.1-2e, 6.2.2.4.1-2f, 6.2.2.4.1-2g, 6.2.2.4.1-2h, 6.2.2.4.1-2h, 6.2.2.4.1-2i, 6.2.2.4.1-2h ... Table 6.2.2.4.1-2c , and are shown in Table 6.2.2.4.1-3. Details of the uplink Reference Measurement Channel (RMC) are specified in Annex A.2. The configuration of the PDSCH and PDCCH before measurements is specified in Annex C.2. and [Table 4-1] [Table 4-2] [Table 4-3] [Table 4-4] and 6.2.2.4.2 Test Procedures 1. The SS sends uplink scheduling information for each UL HARQ process via PDCCH DCI format 0_1 ​​in C_RNTI to schedule UL RMC according to Table 6.2.2.4.1-1, Table 6.2.2.4.1-2, Table 6.2.2.4.1-2a, and Table 6.2.2.4.1-3. The UE sends uplink MAC padding bits in the UL RMC because the UE has no payload and loopback data to send. 2. Continuously send uplink power control “UP” command to the UE with all uplink scheduling information.UMAX It takes at least 200 ms to reach the level. 3. Measure the average power of the UE over the channel bandwidth in radio access mode. The measurement period shall be at least 1 ms continuous over consecutive active uplink slots. In case of TDD, only slots consisting of only UL symbols shall be tested. 4. For UEs supporting Power Class 1 and Power Class 2, repeat steps 1 through 3 for test IDs 22 and 36 in Table 6.2.2.4.1-1 on the applicable bands with the P-Max message exceptions specified in Table 6.2.2.4.3-2. NOTE 1: When switching to a DFT-s-OFDM waveform as specified in the test configuration Tables 6.2.2.4.1-1 and 6.2.2.4.1-2, an NR RRCReconfiguration message is sent with the TRANSFORM_PRECODER_ENABLED condition according to TS38.508-1[5] clause 4.6.3 Table 4.6.3-118 PUSCH-Config. and 6.2.2.4.2 Test Procedures 1. The SS sends uplink scheduling information for each UL HARQ process via PDCCH DCI format 0_1 ​​in C_RNTI to schedule UL RMC according to Table 6.2.2.4.1-1, Table 6.2.2.4.1-2, Table 6.2.2.4.1-2a, and Table 6.2.2.4.1-3. The UE sends uplink MAC padding bits in the UL RMC because the UE has no payload and loopback data to send. 2. Continuously send uplink power control “UP” command to the UE with all uplink scheduling information. UMAX It takes at least 200 ms to reach the level. 3. Measure the average power of the UE over the channel bandwidth in radio access mode. The measurement period shall be at least 1 ms continuous over consecutive active uplink slots. In case of TDD, only slots consisting of only UL symbols shall be tested. 4. For UEs supporting Power Class 1 and Power Class 2 in Band n14, repeat steps 1 through 3 for Test IDs 22 and 36 in Table 6.2.2.4.1-1 in the applicable bands with the P-Max message exceptions specified in Table 6.2.2.4.3-2. NOTE 1: When switching to a DFT-s-OFDM waveform as specified in the test configuration Tables 6.2.2.4.1-1 and 6.2.2.4.1-2, transmit an NR RRCReconfiguration message with the TRANSFORM_PRECODER_ENABLED condition according to TS38.508-1[5] clause 4.6.3 Table 4.6.3-118 PUSCH-Config. and 6.2.2.5 Testing Requirements The maximum output power derived in step 3 must be within the ranges specified by the nominal maximum output power and tolerances in Tables 6.2.2.5-1 through 6.2.2.5-9a. The maximum output power derived in step 4 is shown in Table 6.2.2.5-1 and Table 6.2.2.5-3. and 6.2.2.5.4 The nominal maximum output power and tolerances of the and new table 6.2.2.5-4c: UE power class test requirements for bands other than band n14 for power class 1 (contiguous allocation) shown in Figure 9.

[0047] In the features described herein, rounding to 0.5 dB may be used in the formula(s) herein, recognizing that it may be difficult to achieve an accuracy of less than 0.5 dB in actual device testing.

[0048] According to one exemplary embodiment, an exemplary apparatus may be provided that includes at least one processor and at least one memory that stores instructions that, when executed using the at least one processor, cause the apparatus to perform: determining a channel bandwidth; and, based on the determined channel bandwidth, determining a maximum power reduction for the channel bandwidth using the value of the channel bandwidth as a value in an equation.

[0049] The formula may include selecting a formula from a plurality of formulas and then determining the MPR using the selected formula. The formula may be determined from at least two respective power back-off values ​​of the channel bandwidth. The formula may include a linear formula determined based on at least two highest back-off values ​​of at least two spaced apart respective channel bandwidths in a same channel bandwidth group. The formula may include a channel bandwidth value multiplied by a first power value to generate a product, which is subtracted from a second power value. The formula may include a channel bandwidth value multiplied by a first power value to generate a product, which is added to the second power value. The instructions may further cause determining which channel bandwidth group the channel bandwidth is associated with from the at least two channel bandwidth groups and selecting a formula from the plurality of formulas based on the determined channel bandwidth group. A first formula of the plurality of formulas may be based on a linear formula having a negative slope and a second formula of the plurality of formulas is based on a linear formula having a positive slope. The first group of groups may include a channel bandwidth less than 50 MHz. A second of the groups may include channel bandwidths of 50 MHz or greater.

[0050] Referring also to FIG. 10, according to another exemplary embodiment, an exemplary method may be provided that includes determining a channel bandwidth, as shown at block 1002, and determining a maximum power reduction for the channel bandwidth based on the determined channel bandwidth, as shown at block 1004, using the value of the channel bandwidth as a value in an equation.

[0051] The formula may include selecting an equation from a plurality of equations and then determining the MPR using the selected equation. The equation may be determined from at least two respective power back-off values ​​of the channel bandwidth. The equation may include a linear equation determined based on at least two highest back-off values ​​of at least two spaced apart respective channel bandwidths in the same channel bandwidth group. The equation may include a channel bandwidth value multiplied by a first power value to generate a product, which is subtracted from a second power value. The equation may include a channel bandwidth value multiplied by a first power value to generate a product, which is added to the second power value. The method may further include determining which channel bandwidth group the channel bandwidth is associated with from the at least two channel bandwidth groups, and selecting an equation from the plurality of equations based on the determined channel bandwidth group. A first equation of the plurality of equations may be based on a linear equation having a negative slope, and a second equation of the plurality of equations may be based on a linear equation having a positive slope. The first group of groups may include a channel bandwidth less than 50 MHz. A second of the groups may include channel bandwidths of 50 MHz or greater.

[0052] According to other exemplary embodiments, an example may comprise a non-transitory computer-readable medium including program instructions that, when executed with an apparatus, cause the apparatus to at least determine which channel bandwidth group, from at least two channel bandwidth groups, a channel bandwidth is associated with, and select an equation, from a plurality of equations, based on the determined channel bandwidth group.

[0053] According to another example embodiment, an example apparatus may be provided that includes means for determining which channel bandwidth group a channel bandwidth is associated with from at least two channel bandwidth groups, and means for selecting an equation from a plurality of equations based on the determined channel bandwidth group.

[0054] According to another example embodiment, an example apparatus may be provided that includes at least one processor and at least one memory that stores instructions that, when executed using the at least one processor, cause the apparatus to perform a first test of performance of the apparatus using a first channel bandwidth in a first channel bandwidth group to test a maximum power reduction allowed, the first channel bandwidth being a highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0055] The first test may actually be a third channel bandwidth that is tested in addition to the lowest and highest channel bandwidths. The highest supported channel bandwidth in the first channel bandwidth group may be selected for testing, and it is not necessary to test all channel bandwidths in the first channel bandwidth group.

[0056] The first channel bandwidth group may include a minimum channel bandwidth supported by the device, and the device is further configured to perform a second test of the device's performance with a second channel bandwidth in the second channel bandwidth group to test a maximum power reduction allowed, the second channel bandwidth being a minimum channel bandwidth supported by the device in the second channel bandwidth group. The first channel bandwidth group may include a channel bandwidth less than 50 MHz. The second channel bandwidth group may include a channel bandwidth equal to or greater than 50 MHz. The maximum power reduction allowed may include the determined value rounded up. The determined value may be rounded up to the nearest multiple of approximately 0.5 dB. The instructions, when executed by the at least one processor, may cause the device to perform further tests including testing the minimum and maximum channel bandwidths supported by the device.

[0057] The second test may actually be a fourth channel bandwidth that is tested if the device supports any channel bandwidth in the second channel bandwidth group, etc. The highest supported channel bandwidth in the second channel bandwidth group may be selected for testing, and it is not necessary to test all channel bandwidths in the second channel bandwidth group.

[0058] Referring also to FIG. 11 , according to another exemplary embodiment, an exemplary method includes a first test of performance of an apparatus using a first channel bandwidth in a first channel bandwidth group to test a maximum power reduction allowed, as shown in block 1102, where the first channel bandwidth is the highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus.

[0059] The method may further include a second test of the performance of the device with a second channel bandwidth in the second channel bandwidth group to test a maximum power reduction allowed, the second channel bandwidth being the lowest channel bandwidth supported by the device in the second channel bandwidth group, as shown at block 1104. The first channel bandwidth group may include channel bandwidths less than 50 MHz. The second channel bandwidth group may include channel bandwidths equal to or greater than 50 MHz. The maximum power reduction allowed may include the determined value rounded up. The determined value may be rounded up to the nearest multiple of approximately 0.5 dB. The method may further include testing the lowest and highest channel bandwidths supported by the device, as shown at block 1106.

[0060] According to another exemplary embodiment, an example may be provided having a non-transitory computer readable medium including program instructions that, when executed with an apparatus, cause the apparatus to perform at least a first test of the apparatus's performance with a first channel bandwidth in a first channel bandwidth group to test for a maximum allowed power reduction, the first channel bandwidth being the highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus. The instructions, when executed with the apparatus, may cause the apparatus to perform at least a second test of the apparatus's performance with a second channel bandwidth in a second channel bandwidth group to test for a maximum allowed power reduction, the second channel bandwidth being the lowest channel bandwidth supported by the apparatus in the second channel bandwidth group. The instructions, when executed with the apparatus, may cause the apparatus to perform further tests of at least the lowest and highest channel bandwidths supported by the apparatus.

[0061] According to another exemplary embodiment, an exemplary apparatus may be provided, comprising means for performing a first test of the performance of the apparatus with a first channel bandwidth in a first channel bandwidth group for testing a maximum power reduction allowed, the first channel bandwidth being the highest channel bandwidth supported by the apparatus in the first channel bandwidth group supported by the apparatus. The apparatus may further include means for performing a second test of the performance of the apparatus with a second channel bandwidth in a second channel bandwidth group for testing a maximum power reduction allowed, the second channel bandwidth being the lowest channel bandwidth supported by the apparatus in the second channel bandwidth group. The apparatus may further include means for performing further tests of the lowest and highest channel bandwidths supported by the apparatus.

[0062] According to another exemplary embodiment, an exemplary apparatus may be provided, comprising at least one processor and at least one memory storing instructions, which when executed by the at least one processor, cause the apparatus to perform: determining a channel bandwidth; and determining a maximum power reduction of the channel bandwidth based on the determined channel bandwidth, using the channel bandwidth value as a value in a formula. With respect to the "channel bandwidth value" being the "value in the formula", the "value in the formula" may be, for example, the "CBW" in the first formula above. The "channel bandwidth value" may be one of the channel bandwidth values, for example, in MHz, such as on the X-axis of FIG. 5. For example, the "channel bandwidth value" of the "value in the formula" may be 10 MHz, 20 MHz, 30 MHz, etc.

[0063] According to another example embodiment, an example apparatus may be provided that includes at least one processor and at least one memory that stores instructions that, when executed using the at least one processor, cause the apparatus to perform a first test of minimum and maximum channel bandwidths supported by the apparatus and a second test of performance of the apparatus within a first channel bandwidth group to test a maximum power reduction allowed, the first channel bandwidth group including either a minimum channel bandwidth supported by the apparatus or a maximum channel bandwidth supported by the apparatus.

[0064] As can be seen from the above discussion, current proposals in standardization result in unnecessarily large maximum power reductions near resource blocks located at the edges of the channel bandwidth, and therefore the features described herein allow the use of formulas or algorithms that provide more appropriate reductions.

[0065] The features described herein may be used in 5G / NR to ascertain the maximum power reduction (MPR) allowed for a UE, for example, when a UL RB (resource block) allocation is at or near the UL channel bandwidth edge. The UE may be allowed to reduce its maximum output power due to higher order modulation and transmission bandwidth configuration. An edge RB allocation is defined as an RB allocation that is located at (or near) any channel edge and whose allocation size does not exceed a specified maximum value. Edge RB allocations and corresponding allowed MPR values ​​may be defined for <50 MHz channel bandwidth and ≧50 MHz channel bandwidth. However, if the proposal discussed in RAN4#104-bis-e is adopted, the variation in channel bandwidth within each frequency group will result in a 2 dB UL coverage loss and an excessively large MRP value will be applied. To ensure that the applied MPR is not excessively large more than necessary, the channel bandwidth may be divided into two or more groups (e.g., <50 MHz and ≧50 MHz, etc.), and then an allowed MPR value may be defined within each group based on a respective formula.

[0066] Additionally, to test the UE performance within each group (e.g., <50 MHz and ≧50 MHz), the acceptable MPR for the maximum channel bandwidth <50 MHz and minimum channel bandwidth ≧50 MHz supported by the UE may also be tested. This may be done in addition to testing the currently required minimum and maximum channel bandwidths supported by the UE, so that this may be used to ensure that the UE provides sufficient performance within all supported channel bandwidths in the two channel bandwidth groups.

[0067] As used herein, the term "non-transient" is not a limitation regarding the permanence of the data storage (eg, RAM vs. ROM), but rather a limitation of the medium itself (ie, tangible as opposed to signal).

[0068] The term "circuitry," as used herein, may refer to one or more or all of the following: (a) Hardware-only circuit implementations (e.g., implementations using only analog and / or digital circuitry); (b) For example (where applicable), a combination of the following hardware circuitry and software: (i) A combination of analog and / or digital hardware circuitry(s) and software / firmware; (ii) any portion of the hardware processor(s) using software (including digital signal processor(s)), software, and memory(s) that cooperate to cause a device, such as a mobile phone or a server, to perform various functions; (iii) Hardware circuitry(s) and / or processor(s), such as microprocessor(s) or part of a microprocessor(s), that requires software (e.g., firmware) to operate, but the software may not be present if not necessary for operation.

[0069] This definition of circuitry applies to all uses of the term in this application, including any claims. As a further example, the term circuitry, as used in this application, encompasses merely a hardware circuitry or processor (or processors), or a portion of a hardware circuitry or processor, as well as an embodiment of the software and / or firmware associated therewith. The term circuitry also encompasses, for example, baseband or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or network devices, if applicable to certain claim elements.

[0070] It should be understood that the above description is merely illustrative. Various alternatives and modifications may be devised by those skilled in the art. For example, the features recited in the various dependent claims may be combined with each other in any suitable combination or combinations. Furthermore, features of different embodiments described above may be selectively combined to create new embodiments. Accordingly, this description is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the appended claims.

Claims

1. At least one processor; at least one memory for storing instructions; wherein the instructions, when executed by the at least one processor, cause the apparatus to: determining a channel bandwidth (CBW); determining a maximum power reduction (MPR) for the CBW based on the determined CBW according to an allowable MPR defined by the formula: Run the command, The formula is, if the determined CBW is in the group of CBWs less than 50 MHz, [0010] and The formula is, when the determined CBW is within the group of CBWs equal to or greater than 50 MHz, [0025] and The apparatus, wherein CEIL(x, 0.5 dB) means rounding up x to the nearest multiple of 0.5 dB.

2. The apparatus of claim 1 , wherein the formula is determined from at least two respective power backoff values ​​of a CBW.

3. The apparatus of claim 2 , wherein the formula comprises a linear formula determined based on at least two highest backoff values ​​of at least two spaced apart respective CBWs in a same CBW group.

4. The apparatus comprises: determining which CBW group the channel bandwidth is associated with from at least two CBW groups; selecting the formula from a plurality of formulas based on the determined CBW group; The apparatus of claim 2 further configured to perform the following:

5. determining a channel bandwidth (CBW); determining a maximum power reduction (MPR) for the CBW based on the determined CBW according to an allowable MPR defined by the formula: Including, The formula is, if the determined CBW is in the group of CBWs less than 50 MHz, [0030] and The formula is, when the determined CBW is within the group of CBWs equal to or greater than 50 MHz, [0045] and The method CEIL(x, 0.5 dB) means rounding x up to the nearest multiple of 0.5 dB.

6. The method of claim 5 , wherein the formula is determined from at least two respective power backoff values ​​of the CBW.

7. 7. The method of claim 6, wherein the formula comprises a linear formula determined based on at least two highest backoff values ​​of at least two spaced apart respective CBWs in a same CBW group.

8. determining which CBW group the channel bandwidth is associated with from at least two CBW groups; selecting the formula from a plurality of formulas based on the determined CBW group; The method of claim 6 further comprising:

9. A non-transitory computer readable medium containing program instructions that, when executed using an apparatus, cause the apparatus to at least: determining a channel bandwidth (CBW); determining a maximum power reduction (MPR) for the CBW based on the determined CBW according to an allowable MPR defined by the formula: Run the command, The formula is, if the determined CBW is in the group of CBWs less than 50 MHz, [0050] and The formula is, when the determined CBW is within the group of CBWs equal to or greater than 50 MHz, [006] and CEIL(x, 0.5 dB) means rounding up x to the nearest multiple of 0.5 dB.

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