Apparatus, method, and computer program for pilot transmission

Abstract

Spectral efficiency and capacity can be improved by using superimposed pilot (SIP) transmission. Superimposed (SI) symbols provide for the superimposition of pilot and data signals transmitted in the

Description

Field of the document The present document relates to an apparatus, a method, and a computer program for pilot transmission in a communication system. Background A communication system can be seen as a facility that enables communication sessions between two or more entities such as communication devices, base stations and / or other nodes by providing carriers between the various entities involved in the communications path. The communication system may be a wireless communication system. Examples of wireless systems comprise public land mobile networks (PLMN) operating based on radio standards such as those provided by 3GPP, satellite-based communication systems and different wireless local networks, for example wireless local area networks (WLAN). The wireless systems can typically be divided into cells and are therefore often referred to as cellular systems. The communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and / or parameters which shall be used for the connection are also typically defined. Examples of standard are the so-called 4G, 5G or 6G standards. Summary According to an aspect there is provided a user device comprising: means for receiving, from a base station, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation; and means for transmitting, to the base station, the SI symbols based on the SIP configuration, and / or means for receiving, from the base station, the SI symbols based on the SIP configuration. The SIP configuration in this document is common for all aspects and embodiments. The description of the SIP configuration here can be applied to any of aspects and embodiments. It should be noticed that the SIP configuration illustrated here will not be repeatedly described in other aspects or embodiments for simplicity. The SIP configuration comprises a transmission layer information associated with one or more constellations for transmission or reception of the SI symbols. The SIP configuration is associated with the second set of constellations. The transformation layer information comprising: an indication of a rotation to be applied to determine superimposed pilot, SIP, symbols; and / or an indication of a transformation to be applied to of the SIP symbols. The user device may comprise: obtaining the transformation based on a predefined configuration; obtaining the transformation based on a function indicated by the base station; or receiving, from the base station, an indication of the transformation to be applied to the SIP symbols. The transmission layer information further comprises one or more of: indication of the REs , a pattern for the plurality of REs, and / or a power allocation of SIP symbols. The REs indicates the REs where the SIP symbols are superimposed with data symbols, or the data symbols comprise information associated with SIP symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The power allocation comprises an indication of a power of superimposed pilot, SIP symbols relative to a power of superimposed data, SID symbols in each of the each of the plurality of REs or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols can be configured statically or dynamically via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or mor Downlink Control Information, DCI. The pattern comprising: a pattern of the plurality of REs applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the plurality of REs are for the transmission or reception of the SI symbols. The pattern of the plurality of REs is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier. The pattern of the plurality of REs comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or the code dimension. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The user device may comprise: means for generating the SIP symbols based on the SIP configuration. The user device may comprise: means for mapping SIP symbols to the plurality of REs based on the SIP configuration. The indication of the REs indicates the plurality of REs in which SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprises at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The power allocation comprises an indication of a power of SIP symbols relative to a power of superimposed data, SID symbols in each of the each of the plurality of REs or an indication of an absolute Power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The SIP configuration further comprises transmission layer information associated with one or more modulation constellations to determine SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The user device may comprise means for transmitting or receiving the SI symbols in accordance with a pattern of SI symbols; The transmission layer information further comprises the pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols is to be transmitted. The user device may comprise means for receiving the transmission layer information via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension, alternating SI symbols assignments in a time dimension, alternating SI symbols assignments in a code dimension, or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The transmission layer information further comprises an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The user device may comprise means for obtaining the transformation based on a predefined configuration; means for obtaining the transformation based on a function indicated by the base station; or means for receiving, from the base station, an indication of the transformation. The user device may comprise means for receiving a transmission layer modification information associated with a change of an allocation of transmission layers; and updating the transmission layer information with the transmission layer modification information. The user device may comprise means for receiving, from a base station, a request to receive a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP transmission or reception, and means for transmitting, to the base station, the user equipment capability information. The user device may comprise means for receiving, from the base station, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a method comprising: receiving, from a base station, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and transmitting, to the base station, the SI symbols based on the SIP configuration; or receiving, from the base station, the SI symbols based on the SIP configuration. The method may comprise: generating the SI symbols based on the SIP configuration. The method may comprise: mapping SI symbols to the plurality of REs based on the SIP configuration. The indication of the REs indicates the plurality of REs in which SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprises at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The power allocation comprises an indication of a power of SIP symbols relative to a power of superimposed data, SID, symbols in each of the each of the plurality of REs or an indication of an absolute Power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The SIP configuration further comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols. The one or more modulation constellations for the transmission or reception of the SI symbols may comprise the one or more modulation constellation is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The method may comprise: transmitting the SI symbols in accordance with a pattern of SI symbols; The transmission layer information further comprises: the pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols is to be transmitted. The method may comprise: receiving the transmission layer information via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension, alternating SI symbols assignments in a time dimension, alternating SI symbols assignments in a code dimension, or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The transmission layer information further comprises an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The method may comprise: obtaining the transformation based on a predefined configuration; obtaining the transformation based on a function indicated by the base station; or receiving, from the base station, an indication of the transformation. The method may comprise: receiving a transmission layer modification information associated with a change of an allocation of transmission layers; and updating the transmission layer information with the transmission layer modification information. The method may comprise: receiving, from a base station, a request to receive a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP transmission or reception; and means for transmitting, to the base station, the user equipment capability information. The method may comprise: receiving, from the base station, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a user device comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving, from a base station, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and transmitting, to the base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration. According to an aspect there is provided a user device comprising circuitry configured to perform: receiving, from a base station, a superimposed pilot, SIP, configuration fora transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and transmitting, to the base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: receiving, from a base station, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and transmitting, to the base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration. According to an aspect there is provided an apparatus comprising: means for transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and means for receiving, from the user device, the SI symbols based on the SIP configuration; and / or means for transmitting, to the user device, the SI symbols based on the SIP configuration. The indication of the REs indicates REs where SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprises at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The power allocation comprises an indication of power of the SIP symbols relative to a power of superimposed data, SID, symbols or an indication of an absolute Power of the SIP symbols; and / or the power allocation is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The apparatus may comprise: means for transmitting the transmission layer information via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine the SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The apparatus may comprise: means for transmitting or receiving the SI symbols in accordance with a pattern of SI symbols. The transmission layer information further comprises: the pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols is to be transmitted. The pattern of SI symbols is determined based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The apparatus may comprise: means for obtaining the transformation based on a predefined configuration; means for obtaining the transformation based on a function determined by the apparatus; or means for transmitting, to the user device, an indication of the transformation. The apparatus may comprise: means for transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and means for receiving, from the user device, the UE capability information. The apparatus may comprise: means for transmitting, to a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a method comprising: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or means for transmitting, to the user device, the SI symbols based on the SIP configuration. The indication of the REs indicates REs where SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprises at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The power allocation comprises an indication of a power of SIP symbols relative to a power of superimposed data, SID, symbols or an indication of an absolute Power of the SIP symbols. The power allocation is defined for all SI symbols and data symbols or for each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The method may comprise: transmitting the transmission layer information via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine the SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The method may comprise: transmitting or receiving the SI symbols in accordance with a pattern of SI symbols. The transmission layer information further comprises: the pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols is to be transmitted. The pattern of SI symbols is determined based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The method may comprise: obtaining the transformation based on a predefined configuration; obtaining the transformation based on a function determined by the base station; or transmitting, to the user device, an indication of the transformation. The method may comprise: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. The method may comprise: transmitting, to a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. According to an aspect there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect there is provided an apparatus comprising circuitry configured to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols , and / or a power allocation; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect there is provided a user device comprising: means for receiving, from a base station, a request requesting a user equipment, UE capability information, wherein the UE capability information indicates whether a user device supports superimposed pilot, SIP, transmission or reception; and means for transmitting, to the base station, the UE capability information. The user device may comprise: means for receiving, from the base station, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. The user device may comprise: means for receiving, from the base station, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation; and means for transmitting, to the base station, the SI symbols based on the SIP configuration; and / or means for receiving, from the base station, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The indication of the REs indicates the plurality of REs in which the SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine the SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The user device may comprise: means for transmitting the SI symbols in accordance with a pattern of SI symbols; The transmission layer information further comprises: the pattern of the SI symbols applicable to each of a plurality of transmission layer; and / or an indication of one or more transmission layers where the pattern of SI symbols to be transmitted. The pattern of SI symbols is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, and / or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The user device may comprise: means for obtaining the transformation based on a predefined configuration; means for obtaining the transformation based on a function indicated by the base station; or means for receiving, from the base station, an indication of the transformation. According to an aspect there is provided a method comprising: receiving, from a base station, a request requesting a user equipment, UE capability information, wherein the UE capability information indicates whether a user device supports superimposed pilot, SIP, transmission or reception; and transmitting, to the base station, the UE capability information. The method may comprise: receiving, from the base station, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. The method may comprise: receiving, from the base station, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation; and means for transmitting, to the base station, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The indication of the REs indicates the plurality of REs in which the SIP symbols are superimposed with data symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine the SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The method may comprise: transmitting the SI symbols in accordance with a pattern of SI symbols; The transmission layer information further comprises: the pattern of the SI symbols applicable to each of a plurality of transmission layer; and / or an indication of one or more transmission layers where the pattern of SI symbols to be transmitted. The pattern of SI symbols is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, and / or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The method may comprise: obtaining the transformation based on a predefined configuration; obtaining the transformation based on a function indicated by the base station; or receiving, from the base station, an indication of the transformation. According to an aspect there is provided a user device comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving, from a base station, a request requesting a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP, transmission or reception; and transmitting, to the base station, the UE capability information. According to an aspect there is provided a user device comprising circuitry configured to perform: receiving, from a base station, a request requesting a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP, transmission or reception; and transmitting, to the base station, the UE capability information. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: receiving, from a base station, a request requesting a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP, transmission or reception; and transmitting, to the base station, the UE capability information. According to an aspect, there is provided an apparatus comprising: means for transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and means for receiving, from the user device, the UE capability information. The apparatus may comprise means for transmitting, to the user equipment, network capability information indicating whether the apparatus supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. The apparatus may comprise: means for transmitting, to the user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation; and means for receiving, from the user device, the SI symbols based on the SIP configuration; and / or means for receiving, from the base station, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprises at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The apparatus may comprise: means for receiving the SI symbols in accordance with a pattern of SI symbols. The transmission layer information further comprises: the pattern of SI symbols as a pattern applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols to be transmitted. The pattern of SI symbols is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, and / or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The apparatus may comprise: means for obtaining the transformation based on a predefined configuration; means for obtaining the transformation based on a function indicated by the base station; or means for receiving, from the base station, an indication of the transformation to be applied to the SIP symbols. According to an aspect there is provided a method comprising: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. The method may comprise: transmitting, to the user equipment, network capability information indicating whether the apparatus supports superimposed pilot, SIP transmission or reception. The UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP. The method may comprise: transmitting, to the user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The indication of the REs comprises at least one of: indication of a list of REs per layer where SIP symbols are superimposed with data symbols; or indication of indices of REs per layer where SIP symbols are superimposed with data symbols. The pilot sequence of the SIP symbols comprise at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. The SIP configuration further comprises: transmission layer information associated with one or more modulation constellations to determine the SIP symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP symbols are the pilot part of the SI symbols. The method may comprise: receiving the SI symbols in accordance with a pattern of SI symbols. The transmission layer information further comprises: the pattern of SI symbols as a pattern applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of SI symbols to be transmitted. The pattern of SI symbols is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, and / or a code dimension. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The method may comprise: obtaining the transformation based on a predefined configuration; obtaining the transformation based on a function indicated by the base station; or receiving, from the base station, an indication of the transformation to be applied to the SIP symbols. According to an aspect, there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. According to an aspect there is provided an apparatus comprising circuitry configured to perform: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. According to an aspect there is provided a user device comprising: means for obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and means for transmitting, to a base station, superimposed, SI, symbols based on the SIP configuration; and / or means for receiving, from the base station, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The one or more modulation constellations is applied to determine superimposed pilot, SIP symbols. The SIP configuration comprises: means for receiving a power allocation. The power allocation comprises an indication of a power of SIP symbols relative to superimposed data, SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The transformation layer information further comprises: the transformation is based on a predefined configuration; the transformation is based on a function indicated by the base station; or an indication of the transformation received from the base station. The transmission layer information is received via one or more of: Radio Resource Control, RRC messages, one or more Medium Access Control Control elements, MAC CEs or one or more Downlink Control Information, DCI. The SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbols is to be transmitted. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The user device may comprise: means for receiving, from a base station, a request to receive a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP transmission or reception; and means for transmitting, to the base station, the user equipment capability information. The user device may comprise: means for receiving, from a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP and / or DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a method comprising: obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and transmitting, to a base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration . The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The SIP configuration comprises: a power allocation. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The power allocation comprises an indication of a power of SIP symbols relative to SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The transformation layer information further comprises: the transformation is based on a predefined configuration; the transformation is based on a function indicated by the base station; or an indication of the transformation received from the base station. The transmission layer information is received via one or more of: Radio Resource Control, RRC messages, one or more Medium Access Control Control elements, MAC CEs or one or more Downlink Control Information, DCI. The SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbols is to be transmitted. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The method may comprise: receiving, from a base station, a request to receive a user equipment, UE capability information indicating whether a user device supports superimposed pilot, SIP transmission or reception; and transmitting, to the base station, the user equipment capability information. The method may comprise: receiving, from a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP and / or DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a user device comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations transmission or reception of the SI symbols; and transmitting, to a base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration. According to an aspect there is provided a user device comprising circuitry configured to perform: obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and transmitting, to a base station, the SI symbols based on the SIP configuration; and / or receiving the SI symbols based on the SIP configuration. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and transmitting, to a base station, the SI symbols based on the SIP configuration; and / or receiving, from the base station, the SI symbols based on the SIP configuration. According to an aspect there is provided an apparatus comprising: means for transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and means for receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The SIP configuration comprises: a power allocation. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The power allocation comprises an indication of a power of SIP symbols relative to SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of the power of the SIP symbols relative to the power of SID symbols is defined for all pilot and data or each of the plurality of REs. The power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The transformation layer information further comprises: the transformation is based on a predefined configuration; the transformation is based on a function indicated by the base station; or an indication of the transformation received from the base station. The transmission layer information is received via one or more of: Radio Resource Control, RRC messages, one or more Medium Access Control Control elements, MAC CEs or one or more Downlink Control Information, DCI. The SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbols is to be transmitted. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The apparatus may comprise: means for transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and means for receiving, from the user device, the UE capability information. The apparatus may comprise: transmitting, to a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP and / or DL SIP, or a support of dynamic power SIP. According to an aspect there is provided a method comprising: transmitting, to a user device, a superimposed pilot, SIP, configuration fora transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The SIP configuration comprises: a power allocation. The SI symbols comprise superimposed pilot, SIP, symbols and superimposed data, SID, symbols. The power allocation comprises an indication of a power of SIP symbols relative to SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of the power of SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID is configured statically or dynamically. The transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The transformation layer information further comprises: the transformation is based on a predefined configuration; the transformation is based on a function indicated by the base station; or an indication of the transformation received from the base station. The transmission layer information is received via one or more of: Radio Resource Control, RRC messages, one or more Medium Access Control Control elements, MAC CEs or one or more Downlink Control Information, DCI. The SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbols is to be transmitted. The pattern of SI symbols is identified based on a user device identifier, a cell identifier and / or an antenna identifier. The pattern of SI comprises at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The method may comprise: transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception; and receiving, from the user device, the UE capability information. The method may comprise: transmitting, to a user device, network capability information indicating whether the base station supports superimposed pilot, SIP transmission or reception. The user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP and / or DL SIP, or a support of dynamic power SIP. According to an aspect, there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect there is provided an apparatus comprising circuitry configured to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: transmitting, to a user device, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols; and receiving, from the user device, the SI symbols based on the SIP configuration; and / or transmitting, to the user device, the SI symbols based on the SIP configuration. According to an aspect, there is provided a computer readable medium comprising program instructions stored thereon for performing at least one of the above methods. According to an aspect, there is provided a non-transitory computer readable medium comprising program instructions stored thereon for performing at least one of the above methods. According to an aspect, there is provided a non-volatile tangible memory medium comprising program instructions stored thereon for performing at least one of the above methods. In the above, many different aspects have been described. It should be appreciated that further aspects may be provided by the combination of any two or more of the aspects described above. Various other aspects are also described in the following detailed description and in the attached claims. List of abbreviations Al: Artificial Intelligence BS: Base Station CDM code division multiplex CPE common phase error CU: Centralized Unit DeepRX DL: deep neural network receiver Downlink DM-RS demodulation reference signal ECC error correcting code gNB: gNodeB LLR log likelihood ratio MCS modulation and coding scheme MIMO multiple input-multiple output ML: Machine Learning MS : Mobile Station MU multi-user MTC : Machine Type Communication NR: New radio PAPR peak to average power ratio PDSCH physical downlink shared channel PUCCH physical uplink control channel PUSCH physical uplink shared channel QAM quadrature amplitude modulation RAM: Random Access Memory (R)AN: (Radio) Access Network RE resource element ROM: Read Only Memory RRC radio resource control RS reference signal SI superimposed SID superimposed data SIP superimposed pilots SU single-user TRP transmit receive point UE: User device UL: Uplink 5G: 5th Generation 5G Core network 5GS: 5G System Brief Description of the Figures Embodiments will now be described, by way of example only, with reference to the accompanying Figures in which: Fig. 1 shows a schematic representation of a wireless communication system; Fig. 2 shows a schematic representation of a control apparatus; Fig. 3 shows a schematic representation of a user device; Fig. 4 shows an example of a flow diagram of a process, performed by a UE and a BS, for superimposed pilot, SIP configuration, transmission, and reception; Fig 5 shows an example of a flow diagram of a process, performed by a transmitter for SI symbols transmission and / or reception; Fig.6 shows an example of the possible constellation points in a SIP scheme, where data symbols are drawn from a 16-QAM constellation while the QPSK constellation is used for SIP. Fig 7 shows an example of how the superimposed constellation space (possibilities) may change depending on the allocated superimposed pilot in the SIP scheme; Fig 8 shows an example of the main blocks of a receiver for processing the received signal within the SIP scheme; Fig 9 shows an example of the main blocks of a receiver for processing the received signal within the SIP scheme; Fig. 10 shows an example of an example of orthogonal (non-overlapping in the subcarrier dimension) SIP scheme for two-layer MIMO; Fig. 11 shows an example of an example of orthogonal (non-overlapping in the time dimension) SIP scheme for two-layer MIMO; Fig. 12 shows an example of non-orthogonal (overlapping) SIP scheme for two-layer MIMO; Fig. 13 shows an example of a signalling diagram of a process, performed by a UE and a BS, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 14 shows an example of a flow diagram of a process, performed by a UE and a BS, for superimposed pilot, SIP configuration, transmission, and reception; Fig. 15 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 16 shows an example of a block diagram of a method, performed by the base station, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 17 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 18 shows an example of a block diagram of a method, performed by base station, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 19 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception; Fig. 20 shows an example of a block diagram of a method, performed by base station, for a superimposed pilot, SIP configuration, transmission and reception; and Fig. 21 shows a schematic representation of a non-volatile memory medium storing instructions which when executed by a processor allow a processor to perform one or more of the steps of the methods of Fig. 15 to Fig. 20. Detailed Description of the Figures In the following certain embodiments are explained with reference to mobile communication devices capable of communication via a wireless cellular system and mobile communication systems serving such mobile communication devices. Before explaining in detail the exemplifying embodiments, certain general principles of a wireless communication system, access systems thereof, and mobile communication devices are briefly explained with reference to Fig. 1, Fig.2, and Fig.3 to assist in understanding the technology underlying the described examples. FIG. 1 shows a schematic representation of a wireless communication environment 100, which may be a part of a communication network, comprises a terminal device 110 and a network device 120. To transmit data and / or control information, the terminal device 110 may perform communications with network device 120. The communication between the terminal device 110 and network device 120 may be direct or indirect. A link from network device 120 to the terminal device 110 is referred to as a downlink (DL), while a link from the terminal device 110 to network device 120 is referred to as an uplink (UL). The terminal device 110 and / or network device 120 may communicate with one or more further devices not shown in FIG. 1. In some embodiments, the wireless communication environment 100 may further comprise core network device 130. In this case, network device 120 may communicate with the core network device 130. Although the terminal device 110, network device 120, and the core network device 130 are described in the wireless communication environment 100 of FIG. 1, embodiments of the present disclosure may equally apply to any other suitable communication devices in communication with one another. That is, embodiments of the present disclosure are not limited to the exemplary scenarios of FIG. 1. In this regard, it is noted that although the terminal device 110 is schematically depicted as a mobile phone and network device 120 is schematically depicted as a base station in FIG. 1, it is understood that these depictions are exemplary in nature without suggesting any limitation. In other embodiments, the first device 110 and network device 120 may be any other communication devices, for example, any other wireless communication devices. The communications in the environment 100 may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS), long term evolution (LTE), LTE-Advanced (LTE-A), the fifth generation (5G) New Radio (NR), 6G, Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), Bluetooth, ZigBee, and machine type communication (MTC), enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), Carrier Aggregation (CA), Dual Connectivity (DC), and New Radio Unlicensed (NR-U) technologies. Fig. 2 illustrates an example of a control apparatus 200 for controlling a function of the network device 120 illustrated on Fig. 1. The control apparatus may comprise at least one random access memory (RAM) 211a, at least on read only memory (ROM) 211b, at least one processor 212, 213 and an input / output interface 214. The at least one processor 212, 213 may be coupled to the RAM 211a and the ROM 211b. The at least one processor 212, 213 may be configured to execute an appropriate software code 215. The software code 215 may for example allow to perform one or more steps to perform one or more of the present aspects. The software code 215 may be stored in the ROM 211b. The control apparatus 200 may be interconnected with another control apparatus 200 controlling another function of the network device. In some embodiments, each function of the network device comprises a control apparatus 200. In alternative embodiments, two or more functions of the network device may share a control apparatus. Fig. 3 illustrates an example of a user device 300, such as the terminal device illustrated on Fig. 1. The UE 300 may be provided by any device capable of sending and receiving radio signals. Non-limiting examples comprise a user device, a mobile station (MS) or mobile device such as a mobile phone or what is known as a ’smart phone’, a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, an Internet of things (loT) device or any combinations of these or the like. The UE 300 may provide, for example, communication of data for carrying communications. The communications may be one or more of voice, electronic mail (email), text message, multimedia, data, machine data and so on. The UE 300 may receive signals over an air or radio interface 307 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals. In Fig. 3 transceiver apparatus is designated schematically by block 306. The transceiver apparatus 306 may be provided for example by means of a radio part and associated antenna arrangement. The antenna arrangement may be arranged internally or externally to the mobile device. The UE 300 may be provided with at least one processor 301, at least one memory ROM 302a, at least one RAM 302b and other possible components 303 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices. The at least one processor 301 is coupled to the RAM 302b and the ROM 302a. The at least one processor 301 may be configured to execute an appropriate software code 308. The software code 308 may for example allow to perform one or more of the present aspects. The software code 308 may be stored in the ROM 302a. The processor, storage and other relevant control apparatus can be provided on an appropriate circuit board and / or in chipsets. This feature is denoted by reference 304. The device may optionally have a user interface such as keypad 305, touch sensitive screen or pad, combinations thereof or the like. Optionally one or more of a display, a speaker and a microphone may be provided depending on the type of the device. In 5G NR, the Physical Uplink Shared Channel (PUSCH) and the Physical Downlink Shared Channel (PDSCH) are the physical uplink (UL) and downlink (DL) channels that carry user data. The Demodulation Reference Signal (DM-RS) is the reference signals associated with PUSCH and PDSCH. DM-RS is used for channel estimation as part of coherent demodulation of PUSCH and PDSCH. The time-frequency structure of reference signals depends on the type of waveform configured for PUSCH, as defined in TS 38.211 Sections 6.4.1.1 and 6.4.1.2. following the TS 38.300, DM-RS based spatial multiplexing is supported for PUSCH. Up to 8,12, 16, and 24 orthogonal UL DM-RS ports are supported for type 1, type 2, enhanced type 1, and enhanced type 2 DM-RS respectively. For a given User device (UE), up to 4 or up to 8-layer transmissions are supported. DM-RS Uplink Configuration is sent in the Information Element (IE) DMRS-Uplink Config and DMRS-Downlink Config of Radio Resource Control (RRC) configuration defined in TS 38.331, Clause 6.3.2. The DM-RS used in 5G for channel estimation, also called pilots, which are separated from the data transmission and are ideally orthogonalized among users. This type of approach is generically called in the literature as regular pilot (RP) approach. Due to its orthogonality among users, it may arise pilot contamination issue when the number of users exceeds the number of pilot sequences and different users are being configured with the same pilot sequence. If more pilot sequences are inserted to meet the requirement of the increased users, it will lead to a degradation of spectral efficiency, as portion of the resources is allocated to pilot transmission. One or more aspects of this document provide a solution to manage superimposed pilot, SIP, configuration, transmission, and reception. One or more aspect of this document aims a solution to manage superimposed pilot, SIP configuration, transmission, and reception, higher spectral efficiency and capacity can be achieved by providing more orthogonal pilots and decreases the possibility of pilot reuse among different UEs. As for superimposed pilot, SIP transmission and / or reception, there are several terms need to be noted. Pilot symbol is the reference symbol which is generated based on the pilot constellation, modulation and the pilot sequence known both at the transmitted and the receiver. Data symbol is the symbols generated based on the data constellation and modulation (known to the transmitter and receiver) and the data sequence (known only at the transmitted). Superimposed (SI) symbol in which superimposition of pilot and data symbols transmitted in the same RE (i.e., pilot symbol is laid over / combined with data symbol with a power control on how to lay over them). Superimposed pilot (SIP) symbol is the pilot part of an SI symbol. Superimposed data (SID) symbol is the data part of an SI symbol. Superimposed pilot (SIP) transmission indicates the transmission for transmitting pilot and data over the same resource elements. Superimposed pilot (SIP) configuration is the configuration information for transmitting or receiving in SIP transmission. Fig. 4 shows an example of a flow diagram of a process, performed by a UE and a BS, for superimposed pilot, SIP configuration, transmission, and reception. At step 400, the BS may transmit, to the UE, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, the SIP configuration may comprise one or more of: indications of the REs, pilot sequence of SIP symbols, and / or a power allocation. The indications of the REs indicate the plurality of REs in which SIP symbols are superimposed with data symbols. The indications may be indications of a list of REs (referred as S) per layer or indications of indices of REs (referred to as S) per layer where SIP symbols are superimposed with data symbols. The BS may indicate the pilot sequence of the SIP symbol for some or all entries in the list S. The configuration of the SIP symbols may comprise at least one of: a configuration type, a number of SI symbols, or a number of code division multiplex groups, CDM groups. For example, the pilot sequence may comprise value of the allocated SIP from the agreed SIP sequences. In another example, the pilot sequence may comprise seed values for sequence generation of bits and a pilot constellation. The BS may also indicate the power of the SIP symbols. The power allocation may comprise an indication of a Power of SIP symbols relative to a power of SID symbols or an indication of the absolute power of the SIP symbols. The indication of power of the SIP symbols relative to the power of SID symbols may be defined for all SI symbols and data symbols. It may be defined only for or each of the plurality of REs in which SIP symbols are superimposed with data symbols. The power of the SIP symbols can be configured statically or dynamically via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or mor Downlink Control Information, DCI. At step 402, upon receiving the SIP configuration, the transmitter, i.e. either UE or BS generates SI symbols by mapping SIP symbols to SID symbols in the indicated REs based on the received SIP configuration. The procedure of the generation of SIP symbols in transmitter is shown in fig. 5. Fig 5 shows an example of a flow diagram of a process, performed by a transmitter for SI symbols transmission and / or reception. It should be noted that for UL transmission the transmitter is a UE, and the receiver is a BS. For DL transmission, the transmitter is a BS, and the receiver is a UE. In this embodiment the SIP symbols are overlayed over a QAM data symbol for transmission, this scheme is referred as Regular SIP constellation. At steps 500, 502, 504, and 506, the transmitter generates data symbols as per legacy UL or DL transmission i.e., encoding, scrambling, QAM modulating, RE mapping, etc. At steps 514, 516, and 518, the UE generates SIP symbols from a standard QAM constellation as configured by the gNB. the generation of a SIP symbol contains applying the SIP configuration to determine a complex number and an associated power level, associating this complex number to a RE and generating the SIP symbol by mapping the complex number to the associated RE as indicated by the list S. At step 516, the UE adjusts the power of SIP symbols based on the power allocation included in the SIP configuration. For example, the SIP configuration comprises a power allocation, wherein the power allocation comprises an indication of a Power of the SIP symbols relative to a power of SID symbols in each of the each of the plurality of REs or an indication of an absolute power of the SIP symbols in each of the plurality of REs. The indication of power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs. The power of the SIP symbols relative to the power of SID is configured via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, one or more Downlink Control Information, DCI. The UE adjust its power according to the above-mentioned RRC messages, MAC CE or DCI. At steps 508, 510, and 512, the UE overlays the SIP symbols onto the data symbols as indicated in the list S and generates the OFDM / DFT-S-OFDM signal, once the resource mapping is completed, the OFDM modulation follows as per standard UL or DL transmission. At steps 404a and 404b, as shown in fig. 5 step 512, once the UL or DL signal is generated, the transmitter transmits the generated UL signal or DL signal i.e. SI symbols to the receiver, e.g. BS or UE. At step 404a, the UE transmits the generated SIP symbols with UL data to the BS. At step 404b, the BS transmits the generated SIP symbols with DL data to the UE. Fig.6 shows an example of the possible constellation points in a SIP scheme, where data symbols are drawn from a 16-QAM constellation and the QPSK constellation is used for pilots. For example, if sub-carrier k and OFDM symbol m is a member of list S, then: XSP[k,m\ = / T^E;x + 4E~PP ,XeCx,PcCP Where Cx and CP are the data and SIP constellations, respectively. Also, EP e [0, l]denotes the allocated power for SIP transmission. Note that in SIP transmission scheme, usuallyEp « 1. The corresponding SIP constellation (CSP) includes 64 points / possibilities, However, at each RE in Set S, only 16 points out of these 64 points can be transmitted. At step 406, the receiver receives and extracts the SIP symbols based on the SIP configuration. As mentioned above, the corresponding SIP constellation ( CSP ) includes 64 points / possibilities, at each RE in Set S, only 16 points out of these 64 points can be transmitted. So, the receiver needs to detect the transmitted symbol out of the 16 possible points for each RE. Fig.7 shows an example of how the SIP constellation space (possibilities) may change depending on the allocated SIP in the SIP scheme. The possible SIP points are plotted depending on the assigned pilot to a RE. Thus, the lower row sub-figures of Fig. 7 show the possible 16 constellation points for an RE depending on the assigned pilot value to that RE which are shown in the upper row sub-figures. Fig 8. shows an example of the main blocks of a receiver for processing the received signal in the SIP scheme. In an implementation, the receiver works as a legacy receiver. The UL or DL signal comprises regular SIP symbols and data symbols, the data symbols are drawn from a regular constellation, e.g.16-QAM constellation and the QPSK constellation is used for SIP symbols. At steps 800 and 802, the receiver performs demodulation and de-mapping as per legacy UL or DL reception. At steps 804 and 812, the receiver extracts the SI symbols and data symbols from REs in list S from the received signal based on the SIP configuration. At step 816, the pilot sequence used for SIP symbols in REs is generated by an SIP generation block. At step 814, the received signal at SI REs and the corresponding generated SIP sequence are processed by a channel estimator. The output of the channel estimation block may be fed to the equalizer block. At step 806, the receiver equalizes the received signal at all the REs and recovers the transmitted symbol / data at each RE. It is noted that for the channel estimation task, the pilot part of the received signal is the "interest signal", and the data part transmitted from the transmitter is seen as interference. The receiver channel estimator may need to aggregate the SIP power from several REs to reach a high enough SI NR. At steps 808 and 810, the receiver performs de-mapping, decoding, and estimating UL or DL bits based on the input of the generated SIP sequence. Fig 9. shows an example of the main blocks of a receiver for processing the received signal within the SIP scheme. In another implementation, the receiver is with a Neural receiver. The UL or DL signal comprises regular SIP symbols and data symbols. The data symbols are drawn from a regular constellation, e.g.16-QAM constellation while the QPSK constellation is used for SIP symbols. At steps 900 and 902, the receiver performs demodulation and de-mapping as per legacy UL reception. At steps 904 and 910, the receiver extracts the SI symbols and data symbols from REs in list S from the received signal based on the SIP configuration. At step 912, the pilot sequence used for SI symbols in REs is generated by an SIP generation block. At step 906, the receiver estimates the channel from the extracted SI REs from list S, and / or detects the transmitted symbols at all the SI symbols and data symbols by using a Neural receiver. At step 908, the receiver estimates UL or DL bits based on the input of the Neural receiver. As for the neural receiver, it may be noted that other information such as pilot values for each REs in list S and / or the correlated received signal with the pilot sequence can be fed to the neural receiver as extra inputs. It is also noted that the neural receiver can take different architectures like convolutional neural networks (CNNs), residual neural networks (ResNets), or T ransformers. To train the parameters of the neural receiver, a Cross Entropy (CE) function over the transmitted and estimated bits can be used. CE B —1 (b[d) log b[d) (d)ED b=0 + (i-^d))iog(i-sfdb) where CE is the cross entropy between the transmitted bit and estimated bit at the receiver, averaged over all the data resource elements in the resource grid D and all the B bits in each symbol. To obtain the ground truth values b^ at receiver, the receiver and the transmitter may coordinate to use a pseudo-random generator for bit generation, and the receiver may configure a seed value for generating synthetic bits. in the SIP scheme, the SIP symbols are superimposed with data symbols in indicated REs e.g. list S. There are several ways to superimpose the SIP to data symbols. In an orthogonal SIP scheme, SIP symbols from all layers are not overlapped in REs, which means an RE never has SIP symbols from more than one MIMO layer. In a non-orthogonal SIP scheme, SIP symbols from all layers are overlapped in REs, but the SIP symbol is transformed differently per layer. In an orthogonal SIP scheme, an SI pattern may be designed so that the same RE never has SIP from more than one MIMO layer. The pattern of SI symbols may comprise at least one of: alternating SI symbols assignments in a subcarrier dimension; alternating SI symbols assignments in a time dimension; alternating SI symbols assignments in a code dimension; or alternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension. The pattern of SI symbols may be identified based on a user device identifier, a cell identifier and / or an antenna identifier. Fig. 10 shows an example of an example of orthogonal (non-overlapping in the subcarrier dimension) SIP scheme for two-layer MIMO. In this embodiment, the two MIMO layers use different subcarrier set. In layer 1, odd subcarriers are used to transmit the SI symbols while other subcarriers are used for data transmission. In layer 2, even subcarriers are used for SI symbols transmission while other subcarriers are for data symbols transmission. It is noted that, it may use different subcarrier set for SIP transmission in layer 1 and layer2, the only condition is that the two subcarrier sets are not overlapping in subcarrier dimension. For MIMO with higher number of layers, M, where the M is a positive integer, for example, M is 2,4,8,12,16, and 24 or more. There may be M non-overlapping subcarrier sets to provide orthogonality in the subcarrier for M-layer MIMO. Fig. 11 shows an example of an example of orthogonal (non-overlapping in the time dimension) SIP scheme for two-layer MIMO. In this embodiment, the two MIMO layers use different time pattern. In layer 1, even symbols are used to transmit the SI symbols while other symbols are used for data transmission. In layer 2, odd symbols are used for SI symbols transmission while other symbols are for data symbols transmission. It is noted that, it may use different time patterns for SI transmission in layer 1 and layer 2, the only condition is that the time patterns are not overlapping in time dimension. For MIMO with higher number of layers, M, where the M is a positive integer, for example, M is 2,4,8,12,16, and 24 or more. There may be M non-overlapping time patterns to provide orthogonality in the time dimension for M-layer MIMO. The BS may decide the SIP allocation based on the scheduling decisions, utilizing predefined SI patterns. The BS may signal the chosen pattern to the UE via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI, after which the UE can construct the PUSCH signal comprising SIP symbols. In case, BS is the transmitter, the BS construct the PDSCH signal comprising SIP symbols according to the chosen pattern. When the MIMO layer allocation of the UE is changed, the BS may provide updated SIP configuration parameters to the UE. in case the UE is the transmitter, the UE products PUSCH based on the updated SIP configuration. In case BS is the transmitter, the BS products PDSCH based on the updated SIP configuration. The produced PUSCH and / or PDSCH may comprising SIP symbols generated based on the updated SIP configuration. Fig. 12 shows an example of non-orthogonal (overlapping) SIP scheme for two-layer MIMO; In this embodiment, SIP symbols from all layers are overlapped in REs, but the SIP symbols are transformed differently per layer. A transmission layer information is signalled from BS to UE. The transmission layer information may comprise an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to the SIP symbols. The indication of a rotation, for example, the rotation difference between the constellation and the SIP, can be utilized by the receiver to determine the SIP symbols. In another embodiment, the BS may signal the transmission layer information e.g. transformation of a SIP pattern. The SIP pattern may be transmitted along with the SI symbol pattern and the power level. The SI symbol pattern is applied to SI in the plurality of REs and the SIP pattern is applied to transformation. For example, a gNB configures [1+1j, 1 -1 j] as the SIP pattern, then layer 1 may use this pattern directly, while layer 2 may use a transformed version of this pattern as [1+1 j, -1+1j], A BS may configure such transformation with sharing vector [1, -1], where elementwise multiplication of this vector with the SIP pattern of layer 1 ([1+1 j, 1 -1 j]) results the SIP pattern for layer 2. The transmission layer information can be based on a look-up table of predefined options, or it can be based on an arbitrary function that the BS can provide to the UE. Once having received the configuration, the UE can transmit PUSCH data with the SIP symbols e.g. SIP or the BS can transmit PDSCH data with the SIP symbols as well. It should be noted that the transmission layer information might depend on the number of spatially multiplexed UEs, which means that the allocation can change from one slot to another. Therefore, the BS should have the means to carry this information in the control channel, similar to other scheduling-related information. It can be carried via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or more Downlink Control Information, DCI. Fig.13 shows an example of a signalling diagram of a process, performed by a UE and a BS, for a superimposed pilot, SIP configuration, transmission and reception. At step 1300, the BS may transmit, to the UE, a request to receive UE capability information indicating whether UE supports a superimposed pilot, SIP transmission or reception. At step 1302, UE may transmit a response comprising UE capability information indicating that UE supports the superimposed pilot, SIP transmission or reception. The response may comprise at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP and / or DL SIP, or a support of dynamic power SIP. For example, the UE capability indicating whether UE supports an SIP transmission may comprise: phy-ParametersFRX-Diff { supportedSIP-TypeUL typel, pucch-F2-WithFH supported, pucch-F3-WithFH supported, pucch-F1-3-4WithoutFH notSupported, almostContiguousCP-OFDM-UL supported, multipleCORESET supported, DynamicPowerSIP supported, In another example, the UE capability information may comprise: SIP-RS-Support-UL / DL and / or SIP-RS-Type-UUDL. The SIP-RS-Support-UL / DL Indicates whether the UE supports the SIP transmission or reception in UL and / or DL. The support of transmission or reception may be indicated separately or jointly. The support for UL and DL can also be indicated separately or jointly. The SIP-RS-Type-UL / DL Indicates whether the UE supports SIP type 1, type 2, ...etc in UL / DL. The supported type in UL and / or DL may be indicated separately or jointly. At step 1304, the BS and the UE may perform the process shown in Fig. 4. Fig. 14 shows an example of a flow diagram of a process, performed by a UE and a BS, for superimposed pilot, SIP configuration, transmission, and reception. At step 1400, the BS may transmit, to the UE, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs. The SIP configuration may comprise transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols. The SIP configuration may further comprise a power allocation. The power allocation may comprise an indication of the power of the SIP symbols relative to a power of SID symbols or an indication of the absolute power of the SIP symbols. The indication of power of the SIP symbols relative to the power of SID symbols may be defined for all symbols including all pilots and data symbols. It may be defined only for or each of the plurality of REs in which pilots are superimposed with data symbols. The power of the SIP symbols can be configured statically or dynamically via one or more Radio Resource Control, RRC messages, or one or more Medium Access Control Control elements, MAC CEs, or one or mor Downlink Control Information, DCI. At step 1402, upon receiving the SIP configuration, the transmitter generates SIP symbols and imposing the SIP symbols to data symbols based on the received SIP configuration. For UL transmission, the UE generate the SI symbols. For DL transmission, the BS generates the SI symbols. At step 1404, as shown in fig. 5 step 512, once the UL or DL signal is generated, the transmitter transmits the generated signal i.e. SI symbols and data symbols to the receiver. At step 1404a, the UE transmits the generated SI symbols to the BS with UL data. At step 1404b, the BS transmits the generated SI symbols to the UE with DL data. At step 1406, the receiver receives, and extracts the SI symbols based on the SIP configuration. To manage the configuration, transmission, and reception of SI symbols, the UE and BS may perform procedures described in Fig. 5 to Fig. 12. Fig. 15 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception. At step 1500, a UE may receive, from a BS, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of: indication of the REs, pilot sequence of SIP symbols, and / or a power allocation. At step 1502, the UE may transmit, to the BS, the SI symbols based on the SIP configuration; and / or the UE may receive, from the BS, the SI symbols based on the SIP configuration. Fig. 16 shows an example of a block diagram of a method, performed by the base station, for a superimposed pilot, SIP configuration, transmission and reception. At step 1600, a BS may transmit, to a UE, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises one or more of indication of the REs, pilot sequence of SIP symbols, and / or a power allocation. At step 1602, the BS may receive, from the UE, the SI symbols based on the SIP configuration; and / or the BS may transmit, to the UE, the SI symbols based on the SIP configuration. Fig. 17 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception. At step 1700, a UE may receive, from a BS, a request to receive UE capability information indicating whether the UE supports a superimposed pilot, SIP, transmission or reception. As step 1702, the UE may transmit, to the BS, UE capability information. Fig. 18 shows an example of a block diagram of a method, performed by base station, for a superimposed pilot, SIP configuration, transmission and reception. At step 1800, a BS may transmit, to a UE, a request to receive UE capability information indicating whether the UE supports a superimposed pilot, SIP, transmission or reception. At step 1802, the BS may receive, from the UE, UE capability information. Fig. 19 shows an example of a block diagram of a method, performed by a user device, for a superimposed pilot, SIP configuration, transmission and reception. At step 1900, a UE may receive, from a BS, a superimposed pilot, SIP, configuration for a transmission or reception of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols. At step 1902, the UE may transmit, to the BS, the SI symbols based on the SIP configuration; and / or the UE may receive, from the base station, the SI symbols based on the SIP configuration. Fig. 20 shows an example of a block diagram of a method, performed by base station, for a superimposed pilot, SIP configuration, transmission and reception. At step 2000, a BS may transmit, to a UE, a superimposed pilot, SIP, configuration for the transmission of superimposed, SI, symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises a transmission layer information associated with modulation constellations to determine SI symbols. At step 2002, the BS may receive, from the UE, the SI symbols based on the SIP configuration; and / or the BS may transmit, to the UE, the SI symbols based on the SIP configuration. Fig. 21 shows a schematic representation of a non-volatile memory medium storing instructions which when executed by a processor allow a processor to perform one or more of the steps of the methods of Fig. 15 to Fig. 20. It is noted that while the above describes example embodiments, there are several variations and modifications which may be made to the disclosed solution without departing from the scope of the present invention. The embodiments may thus vary within the scope of the attached claims. In general, some embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto. While various embodiments may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as nonlimiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. The embodiments may be implemented by computer software stored in a memory and executable by at least one data processor of the involved entities or by hardware, or by a combination of software and hardware. Further in this regard it should be noted that any procedures, e.g., as in Fig. 15 to Fig. 20, may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. The software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD. The memory 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, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The data processors 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), application specific integrated circuits (ASIC), gate level circuits and processors based on multi-core processor architecture, as non-limiting examples. Alternatively or additionally some embodiments may be implemented using circuitry. The circuitry may be configured to perform one or more of the functions and / or method steps previously described. That circuitry may be provided in the base station and / or in the communications device. As used in this application, the term “circuitry” may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analogue and / or digital circuitry); (b) combinations of hardware circuits and software, such as: (i) a combination of analogue and / or digital hardware circuit(s) with software / firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as the communications device or base station to perform the various functions described; and (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation. This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example integrated device. The foregoing description has provided by way of exemplary and non-limiting examples a full 5 and informative description of some embodiments However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the teachings will still fall within the scope as defined in the appended claims. 10

Claims

1. A user device comprising:means for obtaining, by a user device, a superimposed pilot, SIP, configuration for transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols;means for transmitting, to a base station, the SI symbols based on the SIP configuration, and / ormeans for receiving, from the base station, the SI symbols based on the SIP configuration.

2. The user device of claim 1, wherein the SIP configuration comprises:means for receiving a power allocation.

3. The user device of claim 2, wherein the power allocation comprises an indication of a power of the SIP symbols relative to a power of the superimposed data, SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs.

4. The user device of claim 2 or claim 3, wherein the indication of the power of the SIP symbols relative to the power of SID symbols is defined for all SI symbols and data symbols or each of the plurality of REs.

5. The user device of any of claims 2-4, wherein the power of the SIP symbols relative to the power of SID symbols is configured statically or dynamically.

6. The user device of any of claims 1, wherein the transmission layer information comprises:an indication of a rotation to be applied to determine the SIP symbols; and / oran indication of a transformation to be applied to the SIP symbols.

7. The user device of claims 6, wherein the transformation layer information further comprises:the transformation is based on a predefined configuration;the transformation is based on a function indicated by the base station; oran indication of the transformation received from the base station.

8. The user device of any of claims 1, claims 6 or claim 7, wherein the transmission layer information is received via one or more of: Radio Resource Control, RRC messages, one or more Medium Access Control Control elements, MAC CEs or one or more Downlink Control Information, DCI.

9. The user device of any of claim 1- 6, wherein the SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbols are to be transmitted.

10. The user device of claim 9, wherein the pattern of SI symbols is identified based on a user equipment identifier, a cell identifier and / or an antenna identifier.

11. The user device of claim 9, wherein the pattern of SI comprises at least one of: alternating SI symbols assignments in a subcarrier dimension;alternating SI symbols assignments in a time dimension;alternating SI symbols assignments in a code dimension; oralternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, or a code dimension.

12. The user device of any of claims 1-11, comprising:means for receiving, from a base station, a request to receive a user equipment, UEcapability information indicating whether a user device supports superimposed pilot, SIP transmission or reception;means for transmitting, to the base station, the user equipment capability information.

13. The user equipment of claim 12, wherein the user equipment, UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP.

14. An apparatus comprising:means for transmitting, to a user device, a superimposed pilot, SIP, configuration for the transmission or reception of superimposed, SI symbols on a plurality of resourceelements, REs, wherein the SIP configuration comprises a transmission layer information associated with a modulation constellation for transmission or reception of the SI symbols;means for receiving, from the user device, the SI symbols based on the SIP configuration;means for transmitting, to the user device, the SI symbols based on the SIP configuration.

15. The apparatus of claim 14, wherein the SIP configuration comprises: means for transmitting a power allocation.

16. The apparatus of claim 15, wherein the power allocation comprises an indication of a power of SIP symbols relative to a power of superimposed data, SID symbols or an indication of an absolute power of the SIP symbols in each of the plurality of REs.

17. The apparatus of any of claim 16, wherein the power of the SIP symbols relative to the power of SID symbols in each of the plurality of REs is configured statically or dynamically.

18. The apparatus of claims 14, wherein the transmission layer information comprises: an indication of a rotation to be applied to determine the SIP symbols; and / or an indication of a transformation to be applied to of the SIP symbols.

19. The apparatus of claim 18, wherein the transformation layer information further comprises:the transformation is based on a predefined configuration.the transformation is based on a function determined by the apparatus; or an indication of the transformation to be applied to the SIP symbols.

20. The apparatus of any of claim 14-18, wherein the SIP configuration further comprises: a pattern of SI symbols applicable to each of a plurality of transmission layers; and / or an indication of one or more transmission layers where the pattern of the SI symbolsis to be transmitted.

21. The apparatus of any of claim 20, the pattern of SI symbols comprises at least one of: alternating SI symbols assignments in a subcarrier dimension;alternating SI symbols assignments in a time dimension;alternating SI symbols assignments in a code dimension; oralternating SI symbols assignments in a combination of at least two dimensions among a subcarrier dimension, a time dimension, and / or a code dimension.

22. The apparatus of any of claim 14-21:means for transmitting, to a user device, a request to receive a user equipment, UE capability information indicating whether the user device supports superimposed pilot, SIP transmission or reception.means for receiving, from the user device, the UE capability information.

23. The apparatus of claim 22, wherein the UE capability information further comprises at least one of: one or more SIP types, one or more SIP lengths, one or more Physical Uplink Control Channel, PUCCH formats, a support of frequency hopping, a support of multiple CORESET, support of UL SIP, support of DL SIP, or a support of dynamic power SIP.

24. A method comprising:obtaining, by a user device, a superimposed pilot, SIP, configuration for a transmission or reception of SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols;transmitting, to a base station, the SI symbols based on the SIP configuration, and / or receiving, from the base station, the SI symbols based on the SIP configuration.

25. A method comprising:transmitting, to a user device, a superimposed pilot, SIP, configuration for transmission or reception of superimposed, SI symbols on a plurality of resource elements, REs, wherein the SIP configuration comprises transmission layer information associated with one or more modulation constellations for the transmission or reception of the SI symbols;receiving, from the user device, the SI symbols based on the SIP configuration; and / ortransmitting, to the user device, the SI symbols based on the SIP configuration.55

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