Patent Publication Number: US-2022225080-A1

Title: Degradation signaling

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Application No. 62/826,098, filed Mar. 29, 2019. The entire content of the above-referenced application is hereby incorporated by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The example and non-limiting embodiments relate generally to radio signal communications and, more particularly, to messaging regarding signal degradation. 
     Brief Description of Prior Developments 
     When an uplink channel frequency and a downlink channel frequency are close to one another or have a harmonic relationship with one another, sensitivity may degrade if there is simultaneous transmission on the uplink and downlink frequencies. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing aspects and other features are explained in the following description, taken in connection with the accompanying drawings, wherein: 
         FIG. 1  is a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced; 
         FIG. 2  is a diagram illustrating features as described herein; 
         FIG. 3  is a diagram illustrating features as described herein; 
         FIG. 4  is a diagram illustrating features as described herein; 
         FIG. 5  is a diagram illustrating features as described herein; 
         FIG. 6A  is a table illustrating part of an example of a maximum sensitivity degradation table as described herein; 
         FIG. 6B  is a table illustrating part of an example of a maximum sensitivity degradation table as described herein; 
         FIG. 7  is a table illustrating an example of a maximum sensitivity degradation table as described herein; 
         FIG. 8  is a flowchart illustrating steps as described herein; and 
         FIG. 9  is a flowchart illustrating steps as described herein. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The following abbreviations that may be found in the specification and/or the drawing figures are defined as follows:
     3GPP third generation partnership project   5G fifth generation   5GC 5G core network   AMF access and mobility management function   ARFCN absolute radio frequency channel number   BCS Bandwidth Combination Set   BW bandwidth   CIM 3  Third Order Counter Inter-Modulation   CA Carrier Aggregation   CA/DC Carrier Aggregation/Dual Connectivity   CU central unit   DAC Digital Analogue Converter   DU distributed unit   eNB (or eNodeB) evolved Node B (e.g., an LTE base station)   EN-DC E-UTRA-NR dual connectivity   en-gNB or En-gNB node providing NR user plane and control plane protocol terminations towards the UE, and acting as secondary node in EN-DC   E-UTRA evolved universal terrestrial radio access, i.e., the LTE radio access technology   FDD Frequency Division Duplex   FR 1  Frequency Range  1     gNB (or gNodeB) base station for 5G/NR, i.e., a node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC   HARQ Hybrid Automatic Repeat Request   I/F interface   IMD intermodulation   LB long block   LTE long term evolution   MAC medium access control   MME mobility management entity   MSD Maximum Sensitivity Degradation   ng or NG new generation   ng-eNB or NG-eNB new generation eNB   NR new radio   N/W or NW network   PDCP packet data convergence protocol   PHY physical layer   QSPK quadrature phase shift keying   RAN radio access network   RB Resource Block   RE resource element   Rel release   RLC radio link control   RRH remote radio head   RRC radio resource control   RSRQ reference signal quality   RU radio unit   Rx receiver   SDAP service data adaptation protocol   SGW serving gateway   SINR Signal-To-Interference-Plus-Noise Ratio   SMF session management function   SRB 3  Signalling Radio Bearer  3     TDD Time Division Duplex   TS technical specification   Tx transmitter   UE user equipment (e.g., a wireless, typically mobile device)   UPF user plane function   

     Turning to  FIG. 1 , this figure shows a block diagram of one possible and non-limiting example in which the examples may be practiced. A user equipment (UE)  110 , radio access network (RAN) node  170 , and network element(s)  190  are illustrated. In the example of  FIG. 1 , the user equipment (UE)  110  is in wireless communication with a wireless network  100 . A 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  interconnected through 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 address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like. 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 of or both parts  140 - 1  and/or  140 - 2 , which may be implemented in a number of ways. The module  140  may be implemented in hardware as module  140 - 1 , such as being implemented as part of the one or more processors  120 . The module  140 - 1  may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the module  140  may be implemented as module  140 - 2 , which is implemented as computer program code  123  and is executed by the one or more processors  120 . For instance, the one or more memories  125  and the computer program code  123  may be configured to, with the one or more processors  120 , cause the user equipment  110  to perform one or more of the operations as described herein. The UE  110  communicates with RAN node  170  via a wireless link  111 . 
     The RAN node  170  in this example is a base station that provides access by wireless devices such as the UE  110  to the wireless network  100 . The RAN node  170  may be, for example, a base station for 5G, also called New Radio (NR). In 5G, the RAN node  170  may be a NG-RAN node, which is defined as either a gNB or an ng-eNB. A gNB is a node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to a 5GC (such as, for example, the network element(s)  190 ). The ng-eNB is a node providing E-UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC. The NG-RAN node may include multiple gNBs, which may also include a central unit (CU) (gNB-CU)  196  and distributed unit(s) (DUs) (gNB-DUs), of which DU  195  is shown. Note that the DU may include or be coupled to and control a radio unit (RU). The gNB-CU is a logical node hosting RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the en-gNB that controls the operation of one or more gNB-DUs. The gNB-CU terminates the Fl interface connected with the gNB-DU. The Fl interface is illustrated as reference  198 , although reference  198  also illustrates a link between remote elements of the RAN node  170  and centralized elements of the RAN node  170 , such as between the gNB-CU  196  and the gNB-DU  195 . The gNB-DU is a logical node hosting RLC, MAC and PHY layers of the gNB or en-gNB, and its operation is partly controlled by gNB-CU. One gNB-CU supports one or multiple cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the Fl interface  198  connected with the gNB-CU. Note that the DU  195  is considered to include the transceiver  160 , e.g., as part of a RU, but some examples of this may have the transceiver  160  as part of a separate RU, e.g., under control of and connected to the DU  195 . The RAN node  170  may also be an eNB (evolved NodeB) base station, for LTE (long term evolution), or any other suitable base station or node. 
     The RAN node  170  includes one or more processors  152 , one or more memories  155 , one or more network interfaces (N/W I/F(s))  161 , and one or more transceivers  160  interconnected through 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 , memories  155 , and network interfaces  161 . Note that the DU  195  may also contain its own memory/memories and processor(s), and/or other hardware, but these are not shown. 
     The RAN node  170  includes a module  150 , comprising one of or both parts  150 - 1  and/or  150 - 2 , which may be implemented in a number of ways. The module  150  may be implemented in hardware as module  150 - 1 , such as being implemented as part of the one or more processors  152 . The module  150 - 1  may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the module  150  may be implemented as module  150 - 2 , which is implemented as computer program code  153  and is executed by the one or more processors  152 . For instance, the one or more memories  155  and the computer program code  153  are configured to, with the one or more processors  152 , cause the RAN node  170  to perform one or more of the operations as described herein. Note that the functionality of the module  150  may be distributed, such as being distributed between the DU  195  and the CU  196 , or be implemented solely in the DU  195 . 
     The one or more network interfaces  161  communicate over a network such as via the links  176  and  131 . Two or more gNBs  170  may communicate using, e.g., link  176 . The link  176  may be wired or wireless or both and may implement, for example, an Xn interface for 5G, an X 2  interface for LTE, or other suitable interface for other standards. 
     The one or more buses  157  may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like. 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 gNB implementation for 5G, with the other elements of the RAN node  170  possibly being physically in a different location from the RRH/DU, and the one or more buses  157  could be implemented in part as, for example, fiber optic cable or other suitable network connection to connect the other elements (e.g., a central unit (CU), gNB-CU) of the RAN node  170  to the RRH/DU  195 . Reference  198  also indicates those suitable network link(s). It is noted that description herein indicates that “cells” perform functions, but it should be clear that equipment which forms the cell will perform the functions. The cell makes up part of a base station. That is, there can be multiple cells per base station. For example, there could be three cells for a single carrier frequency and associated bandwidth, each cell covering one-third of a 360 degree area so that the single base station&#39;s coverage area covers an approximate oval or circle. Furthermore, each cell can correspond to a single carrier and a base station may use multiple carriers. So if there are three 120 degree cells per carrier and two carriers, then the base station has a total of 6 cells. 
     The wireless network  100  may include a network element or elements  190  that may include core network functionality, and which provides connectivity via a link or links  181  with a further network, such as a telephone network and/or a data communications network (e.g., the Internet). Such core network functionality for 5G may include access and mobility management function(s) (AMF(S)) and/or user plane functions (UPF(s)) and/or session management function(s) (SMF(s)). Such core network functionality for LTE may include MME (Mobility Management Entity)/SGW (Serving Gateway) functionality. These are merely exemplary functions that may be supported by the network element(s)  190 , and note that both 5G and LTE functions might be supported. The RAN node  170  is coupled via a link  131  to a network element  190 . The link  131  may be implemented as, e.g., an NG interface for 5G, or an  51  interface for LTE, or other suitable interface for other standards. The network element  190  includes one or more processors  175 , one or more memories  171 , and one or more network interfaces (N/W I/F(s))  180 , interconnected through 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  are configured to, with the one or more processors  175 , cause the network element  190  to perform one or more operations. 
     The wireless network  100  may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network. Network virtualization involves platform virtualization, often combined with resource virtualization. Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors  152  or  175  and memories  155  and  171 , and also such virtualized entities create technical effects. 
     The computer readable memories  125 ,  155 , and  171  may be of any type suitable to the local technical 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 means for performing storage functions. The processors  120 ,  152 , and  175  may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The processors  120 ,  152 , and  175  may be means for performing functions, such as controlling the UE  110 , RAN node  170 , and other functions as described herein. 
     In general, the various embodiments of the user equipment  110  can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions. 
     Features as described herein may be used to define signaling. More specifically, features as described herein may be used to define signaling in regard to UE receiver performance degradation for example. In one example embodiment features as described herein may be used to define signaling such that a user equipment (UE) may indicate to a network an actual maximum sensitivity degradation (MSD) required for each supported E-UTRA-NR Dual Connectivity (EN-DC) or Long Term Evolution/New Radio Carrier Aggregation/Due Connectivity (LTE/NR CA/DC) configuration. This may be, for example, from those configurations allowed in maximum sensitivity degradation tables and/or configurations to include no maximum sensitivity degradation at all. This may be related to the signaling described in 3GPP Technical Specification (TS) 36.331 relating to Long Term Evolution (LTE) and/or 3GPP Technical Specification (TS) 38.331 relating to New Radio (NR) for example.  FIG. 6  (shown as  6 A- 6 B) and  FIG. 7  show examples of maximum sensitivity degradation tables for LTE and NR, respectively, for example. 
     Referring now to  FIGS. 6A and 6B , illustrated is a table showing examples of maximum sensitivity degradation for LTE, where  FIG. 6B  is a continuation of the table of  FIG. 6A .  FIGS. 6A and 6B  may illustrate some examples in which MSD may be caused when uplink channel frequency and downlink channel frequency are close to each other.  FIG. 6A  includes that for EUTRA CA configuration CA_ 1 A- 3 A, using EUTRA band  1 , UL Fc of 1950 MHz, UL/DL BW of 5 MHz, UL CLRB of 25, and DL Fc of 2140 MHz, the maximum sensitivity degradation may have a value of 23 dB, where the duplex mode is FDD and the source of IMD is IMD 3 .  FIG. 6A  also includes that for EUTRA CA configuration CA_ 1 A- 8 A, using EUTRA band  3 , UL Fc of 1760 MHz, UL/DL BW of 5 MHz, UL C LRB  of 25, and DL Fc of 1855 MHz, there may be no maximum sensitivity degradation, where the duplex mode is FDD and the source of IMD is not applicable. For example, a UE may, using the table of  FIG. 6A , indicate to a network an actual maximum sensitivity degradation for CA_ 1 A- 3 A of 23 dB, and indicate to the network that there is no maximum sensitivity degradation for CA_ 1 A- 8 A. 
     Referring now to  FIG. 7 , illustrated is a table showing examples of MSD for NR.  FIG. 7  may illustrate some examples in which MSD may be caused when uplink channel frequency and downlink channel frequency have a harmonic relationship with one another.  FIG. 7  includes that where UL band is n 3  and DL band is n 77 , there may be no MSD due to harmonic exception for the DL band at 5 MHz.  FIG. 7  also includes that where UL band is n 3  and DL band is n 77 , there may be MSD of 23.9 dB. For example, a UE may, using the table of  FIG. 7 , indicate to a network that there is no maximum sensitivity degradation for UL band n 3  and DL band n 77  at 5 MHz, and may indicate to the network an actual maximum sensitivity degradation of 23.9 dB at UL band n 3  and DL band n 77  at 10 MHz. 
     Features as described herein may be used to define improved maximum sensitivity degradation values for some E-UTRA-NR Dual Connectivity (EN-DC), Long term Evolution Carrier Aggregation/Dual Connectivity (LTE/NR CA/DC). For example, this may be used in relation to 3GPP TS 36.101 in regard to LTE, and/or New Radio Carrier Aggregation/Dual Connectivity (NR CA/DC) configurations, such as in relation to 3GPP TS 38.101-1, 38.101-2 and 38.101-3 for NR, and signaling such as in the 3GPP TS 36.331 relating to LTE and/or 3GPP TS 38.331 relating to NR for example. With features as described herein, each UE may indicate to a network that the UE can support the improved maximum sensitivity degradation (MSD) values for such configurations. 
     Referring also to  FIG. 2 , one example is shown in regard to signaling between the user equipment (UE)  110  and one or more components of the network  100 . In this example implementation, as shown by  200  the network  100  may transmit a signal or message, such as UECapabilityEnquiry, to the UE  110  to inquire about the capability of the UE. In response to the inquiry  200 , the UE  110  is configured to indicate to the network  100 , such as via signaling or message  202 , an actual or improved MSD required for each EN-DC configuration. Thus, the UE may communicate to the network via the UE capability transfer signaling, such as UECapabilitylnformation as  202  for example, the actual or improved MSD required for each EN-DC configuration. The actual or improved MSD required for each EN-DC configuration may be selected from those allowed in the MSD tables, or the UE may indicate no MSD at all for example. 
     Referring also to  FIGS. 4 , one example is shown in regard to signaling between the user equipment (UE)  110  and one or more components of the network  100 . In this example implementation, as shown by  204  the network  100  may transit a signal or message, such as RRCReconfiguration for example, to the UE  110  for establishing a Radio Connection between UE and Network.  FIG. 3  shows where a RRC reconnection is successful and  FIG. 4  shows where a RRC reconnection has a failure. The UE  110  may be configured to indicate to the network  100  the actual MSD required for each EN-DC configuration in both of these situations. In response to the signaling  204  from the network  100 , as indicated by  206  or  208  the UE  110  may transmit a signal or message to the network  100 . The signal or message  206  or  208  may signal the actual MSD required for each EN-DC configuration. The signal or message  206  may be, for example, via the Signaling Radio Bearer SRB 3  for RRC (re-) configuration, in the case where a RRC reconnection has a failure. Alternatively, in the case where a RRC reconnection has a failure, the signal or message from the UE may be a RRC connection re-establishment message  208 . The actual MSD required for each EN-DC configuration may be from those allowed in the MSD tables or no MSD at all, for example. 
     Referring also to  FIG. 5 , one example is shown in regard to signaling between the user equipment (UE)  110  and one or more components of the network  100 . In this example implementation, the UE  110  may be configured to indicate to the network  100  via measurement reporting  210 , such as MeasurementReport, that the actual MSD occurred with cross band transmit-to-receiver degradation. This may be done, for example, by measuring the resulting SINR in the downlink receive signal when simultaneous transmission on the uplink is present. In example embodiments, the measurement reporting may be explicitly requested by the network  100 , or the measurement reporting may be autonomously reported by the UE  110  as part of normal measurement reporting for example. 
     In one implementation a new Bandwidth Combination Set (BCS) could be defined in the 3GPP standard for the improved MSD performances, then the UE can signal which BCS (old, or new, or both) the UE can support (for example via UE capacity signaling), and the improved MSD may be linked to that particular new BCS support. The UE  110  may inform the network  100  which BCS(s) the UE supports and, in the case where the UE indicated the new BCS with improved MSD, the network can take this improved performance into consideration. Also, in the case where the UE indicates support for improved MSD BCS and other BCS(s) that do not have improved MSD, the network  100  knows that UE  110  has a better filter implemented and the MSD is expected to be better or non-existent for all BCS. This method does not need modification to existing signaling because the BCS signaling is used for both LTE and NR carrier aggregation. 
     As noted above, features as described herein may be used to define some signaling in the LTE and/or NR such that each UE can indicate to the network the actual MSD required for each supported EN-DC/CA/DC configuration. In regard to maximum sensitivity degradation (MSD), as discussed in 3GPP R 4 - 1901880 , a number of FDD-TDD EN-DC configurations have been defined in the Rel- 15  3GPP TS 38.101-3 NR specification. For EN-DC configurations, where the uplink channel frequency (especially NR) is close to, or has a harmonic relationship with, the downlink channel frequency (especially LTE), or two or more uplink channel frequencies transmitted simultaneously generate intermodulation (IMD) product with relation to at least one downlink channel frequency being received by the UE, the downlink reference sensitivity is expected to be degraded if simultaneous transmission on the uplink of the aggressor is present. For example, a NR uplink channel frequency in the TDD band may be close to an LTE downlink channel frequency for an EN-DC configuration in an FDD band. Typical UE implementations may use filters which do not have steep or much out-of-band attenuation in the TDD band since there is no self-band protection required which enables lower front-end insertion loss which is beneficial for coverage. This has the consequence that the spurious and out-of-band emissions rejection to nearby bands is also then lower. In addition, NR has much wider bandwidths than LTE in many FR 1  bands supporting up to  100  MHz channel bandwidth. This results in higher spurious and out-of-band emissions due to transmit spectral re-growth noise at larger frequency offsets away from the transmission channel. Additionally, the cross-modulation effect, when simultaneous wideband transmission on NR is present with narrowband transmission on LTE, reaches further in the frequency domain due to the wider bandwidths of NR. Therefore, third order cross-modulation products are more likely to impact downlink receive bands, especially for those FDD bands with relatively narrow duplex distance. Furthermore, baseband spurious products, such as CIM 3  or transmit DAC sampling images for example, extend further due to wider NR channel bandwidths available for transmission and, thus, are more likely to impact downlink receive bands when they might not have previously reached for LTE carrier aggregation. Receiver blocking is also a factor in such EN-DC configuration that can degrade sensitivity. The potential receiver blocking degradation in FDD band downlink is dependent on the FDD band receive filter rejection in the TDD band transmit frequency range. 
     3GPP TS  36 . 101  specification for LTE and 3GPP TS  38 . 101  specification for NR have made accommodations for cross band transmit-to-receiver degradation in several different ways. A MSD table has been created; Table 7.3B.2.3.3-1: Reference sensitivity exceptions due to close proximity of bands for EN-DC in NR FR 1  in NR 38.101-3. A separate table for MSD due to insufficient cross-band isolation has been created; Table 7.3B.2.3.4-1: Reference sensitivity exceptions due to cross band isolation for EN-DC in NR FR 1  in NR 38.101-3. In 3GPP TS 36.101 for LTE, several FDD-TDD CA combinations of this nature were defined, comprising restricting uplink to only the FDD band or allowing uplink in the TDD band as a distinct BCS option in one case, but this option cannot be applied to EN-DC where both uplinks are required. Moreover, for TDD-TDD bands, a signaling capability has been created to allow the UE to indicate that it cannot support simultaneous transmit-receive. When signaled as such, the UE is only capable of meeting performance when the transmit is orthogonal to the receive in the time domain and, thus, no interference to receiver occurs. However, this solution may not be feasible for FDD-TDD EN-DC since it would require tight scheduling of FDD grants to align with TDD grants yet at the same time adhering to the HARQ timelines. Therefore, MSD may be a more preferred solution to FDD-TDD EN-DC. Features as described herein provide a solution for use of the MSD. 
     The same problems exist also for LTE carrier aggregation/dual connectivity and NR carrier aggregation/dual connectivity. In the case of LTE or NR the carrier aggregation operation is such that only one uplink is used; then, there is no cross-modulation effect as described above, but other mentioned issues may be present. In the case of the LTE or NR carrier aggregation operation is such that two uplinks are used, then the situation is very similar to EN-DC. 
     As discussed in 3GPP R4-1902146, the MSD for each EN-DC configuration may be a function of the separation between transmit and receive frequencies as well as the uplink and downlink bandwidths. The MSD for each UE may be different depending on implementation. For example, previously there was not sufficient isolation between TDD Band  41  and mid-spectrum FDD bands such as Band  25 , Band  3  and Band  1  with earlier filters. However, more recent advances in technology have enabled integrated filter/multiplexer products to achieve sufficient isolation between TDD Band  41  and FDD Band  1  to allow for dual transmission in TDD Band  41  and FDD Band  1  uplink carrier aggregation with no MSD allowed. 
     The MSD allowed in the 3GPP TS 36.101 for the LTE specification and 3GPP TS 38.101 for the NR specification have been based on certain implementation assumptions such as achievable filter rejection that should be updated with advances in technology. However, the MSD tables defined in the 3GPP TS 36.101 for the LTE specification and 3GPP TS 38.101 for the NR specification cannot be updated with advances in technology due to backward compatibility issue. Therefore, the network scheduler can only base the scheduling decisions on the MSD tables defined in the 3GPP TS  36 . 101  for the LTE specification and 3GPP TS 38.101 for the NR specification which have been based on outdated technology with the allowed MSD much larger than the ones required by each UE for each EN-DC configuration. This could have a big negative impact on the network performance both in the uplink due to uplink resource block (RB) restriction and the downlink due to pessimistic downlink scheduling. Features as described herein may help to avoid or reduce these issues. As noted above, two uplinks transmitted simultaneously may generate intermodulation (IMD) product to downlink band(s) being received by the UE. MSD tables exist for that, and a similar signaling as described herein could be used to address intermodulation due to simultaneous transmission of two uplinks. 
       FIG. 8  illustrates the potential steps of an example embodiment. In accordance with one aspect, an example method  800  is provided comprising: determining by a user equipment an actual or improved maximum sensitivity degradation for at least one of a plurality of multi-connectivity frequency bands  810 ; and transmitting the determined actual or improved maximum sensitivity degradation from the user equipment to a network equipment  830 . Optionally, the example method may further comprise measuring a Signal-To-Interference-Plus-Noise Ratio in a downlink receive signal when simultaneous transmission on an uplink(s) is present  820 . Optionally, the example method may further comprise receiving by the user equipment from a network a new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation  840 . Optionally, the example method may further comprise the user equipment informing the network which bandwidth combination set(s) the user equipment supports  850 . 
     It should be noted that the order of the steps of the example method may vary, and that the example method may comprise fewer or additional steps. 
     The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may be by a capability transfer signaling the actual or improved maximum sensitivity degradation required for the at least one of the plurality of multi-connectivity frequency bands. The plurality of multi-connectivity frequency bands may be each of a plurality of E-UTRA-NR Dual Connectivity or Long Term Evolution/New Radio Carrier Aggregation/Dual Connectivity (LTE/NR CA/DC) configurations. The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may indicate one allowed in a maximum sensitivity degradation table. The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may indicate no actual or improved maximum sensitivity degradation. The transmitting of the determined actual or improved maximum sensitivity degradation may be in a signaling radio bearer for radio resource control configuration or reconfiguration. The signaling radio bearer may be SRB 3 . The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The method may further comprise measuring a Signal-To-Interference-Plus-Noise Ratio in a downlink receive signal when simultaneous transmission on an uplink(s) is present. The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may be in response to an explicit request from a network. The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may be autonomously reported by the user equipment without an explicit request from a network. The method may further comprise receiving by the user equipment from a network a new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation. This may be used with a new BCS table defined in 3GPP standards to be linked with the improved capability (e.g. 3 dB to 1 dB MSD in new BCS), but not actual MSD performances (e.g. UE can actually meet 0.5 dB MSD) ‘with the determined improved’. The method may further comprise the user equipment informing the network which bandwidth combination set(s) the user equipment supports. 
     In accordance with another aspect, an example embodiment may be provided in an apparatus comprising: at least one processor; at least one non-transitory memory including computer program code, the at least one non-transitory memory and the computer program code configured to, with the at least one processor, cause the apparatus to: determine by a user equipment an actual or improved maximum sensitivity degradation for at least one of a plurality of multi-connectivity frequency bands; and cause transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment to a network equipment. 
     The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment with a capability transfer signaling of the respective actual or improved maximum sensitivity degradation required for the at least one of the plurality of multi-connectivity frequency bands. The plurality of multi-connectivity frequency bands may respectively comprise a plurality of E-UTRA-NR Dual Connectivity configurations, or Carrier Aggregation or Dual Connectivity in Long Term Evolution or New Radio configurations. The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment indicated as the at least one of the plurality of multi-connectivity frequency bands allowed in a maximum sensitivity degradation table. The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment indicated as the at least one of the plurality of multi-connectivity frequency bands associated with no actual or improved maximum sensitivity degradation. The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation in a signaling radio bearer for radio resource control configuration or reconfiguration. The signaling radio bearer may be SRB 3 . The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The apparatus may be further configured to cause measuring of a Signal-To-Interference-Plus-Noise Ratio in a downlink receive signal when simultaneous transmission on one or more uplinks is present. The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment in response to an explicit request from a network. The apparatus may be further configured to cause the transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment autonomously without an explicit request from a network. The apparatus may be further configured to cause receiving with the user equipment from a network at least one new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation. The apparatus may be further configured to cause the user equipment to inform the network which bandwidth combination set(s) the user equipment supports. 
     In accordance with another aspect, an example embodiment may be provided in a non-transitory program storage device, such as shown in  FIG. 1 , readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising: determining by a user equipment an actual or improved maximum sensitivity degradation for at least one of a plurality of multi-connectivity frequency bands; and transmitting the determined actual or improved maximum sensitivity degradation from the user equipment to a network equipment. 
     The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The operations may further comprise measuring a Signal-To-Interference-Plus-Noise Ratio in a downlink receive signal when simultaneous transmission on one or more uplinks is present. The operations may further comprise receiving with the user equipment from a network at least one new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation. 
     In accordance with another aspect, an example embodiment may be provided in an apparatus comprising: means for determining by a user equipment an actual or improved maximum sensitivity degradation for at least one of a plurality of multi-connectivity frequency bands; and means for transmitting the determined actual or improved maximum sensitivity degradation from the user equipment to a network equipment. 
     The transmitting of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The apparatus may further comprise means for measuring a Signal-To-Interference-Plus-Noise Ratio in a downlink receive signal when simultaneous transmission on one or more uplinks is present. The apparatus may further comprise means for receiving with the user equipment from a network at least one new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation. 
       FIG. 9  illustrates the potential steps of an example embodiment. In accordance with another aspect, an example method  900  may be provided comprising: receiving by a network equipment an indication of a determined actual or improved maximum sensitivity degradation from a user equipment  920 ; and using the information received from the user equipment to assist in scheduling decisions by the network equipment  940 . Optionally, the example method may further comprise transmitting an explicit request for the indication of the determined actual or improved maximum sensitivity degradation  910 , where the receiving for the indication is in response to the explicit request. Optionally, the example method may further comprise transmitting to the user equipment with the network equipment a new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation  930 . 
     It should be noted that the order of the steps of the example method may vary, and that the example method may comprise fewer or additional steps. 
     The receiving of the indication of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise receiving measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The method may further comprise transmitting an explicit request for the indication of the determined actual or improved maximum sensitivity degradation to the user equipment, where the receiving of the indication may be in response to the explicit request. The method may further comprise transmitting to the user equipment with the network equipment a new defined bandwidth combination set which may be linked with the determined improved maximum sensitivity degradation. 
     In accordance with another aspect, an example embodiment may be provided in an apparatus comprising: at least one processor; at least one non-transitory memory including computer program code, the at least one non-transitory memory and the computer program code configured to, with the at least one processor, cause the apparatus to: cause receiving by a network equipment of an indication of a determined actual or improved maximum sensitivity degradation from a user equipment; and using the information received from the user equipment to assist in scheduling decisions by the network equipment. 
     The causing of the receiving of the indication of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise causing receiving of measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The apparatus may be further configured to cause transmitting of an explicit request for the indication of the determined actual or improved maximum sensitivity degradation to the user equipment, where the receiving of the indication may be in response to the explicit request. The apparatus may be further configured to cause transmitting to the user equipment with the network equipment a new defined bandwidth combination set which may be linked with the determined improved maximum sensitivity degradation. 
     In accordance with another aspect, an example embodiment may be provided in a non-transitory program storage device, such as shown in  FIG. 1  for example, readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising: cause receiving by a network equipment an indication of a determined actual or improved maximum sensitivity degradation from a user equipment; and using the information received from the user equipment to assist in scheduling decisions by the network equipment. 
     The causing of the receiving of the indication of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise causing receiving of measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The operations may further comprise cause transmitting of an explicit request for the indication of the determined actual or improved maximum sensitivity degradation to the user equipment, where the receiving of the indication is in response to the explicit request. The operations may further comprise cause transmitting to the user equipment with the network equipment a new defined bandwidth combination set which is linked with the determined improved maximum sensitivity degradation. 
     In accordance with another aspect, an example embodiment may be provided in an apparatus comprising: means for receiving by a network equipment an indication of a determined actual or improved maximum sensitivity degradation from a user equipment; and means for using the information received from the user equipment to assist in scheduling decisions by the network equipment. 
     The receiving of the indication of the determined actual or improved maximum sensitivity degradation from the user equipment may comprise receiving measurement reporting of the determined actual or improved maximum sensitivity degradation from the user equipment with cross band transmit-to-receive degradation. The apparatus may further comprise means for transmitting an explicit request for the indication of the determined actual or improved maximum sensitivity degradation to the user equipment, where the receiving of the indication may be in response to the explicit request. The apparatus may further comprise means for transmitting to the user equipment with the network equipment a new defined bandwidth combination set which may be linked with the determined improved maximum sensitivity degradation. 
     A network scheduler can use the information to assist in scheduling decisions. For example, the information may be used by the network to reduce the uplink or downlink resource blocks allocation for the UE that previously required large MSD, or avoid uplink resource blocks that now require large MSD. The UE may or may not already be measuring the SINR for data signal according to implementation. This is different from the conventional 3GPP standards which require the UE to measure reference signal quality (RSRQ), because the conventional 3GPP standards do not require measurement of data signal quality. 
     It should be understood that the foregoing description is only illustrative. Various alternatives and modifications can be devised by those skilled in the art. For example, features recited in the various dependent claims could be combined with each other in any suitable combination(s). In addition, features from different embodiments described above could be selectively combined into a new embodiment. Accordingly, the description is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended claims.