A method performed by an access point in an access network, the method comprising: • broadcasting information comprising an index of a respective option for each of at least one air interface building block of a first air interface configuration, each air interface building block having a predefined set of possible options each being associated with an index, and each air interface building block represents a set of parameters used to define an air interface configuration (step 450), • transmitting to a first user equipment, UE, or receiving from the first UE data by using the first air interface configuration for a first service in accordance with the broadcast information (step 452), • communicating with a second UE with a second air interface configuration for a second service, wherein the first service is in a first slice different from a second slice for the second service in the access network, wherein the first and second air interface configurations are respectively associated with different numerologies, and each numerology comprises at least two of the following parameters: sub-carrier spacing, symbol duration, or a cyclic prefix, CP, length; • when downlink data for one service among the first and second services arrive, transmitting the downlink data for the one service to a UE among the first and second UE to which the one service belongs by sending the downlink data in a wireless resource allocated for the one service, thereby, due to the sending of the downlink data on the wireless resource allocated to the one service, wherein the sending in the wireless resource indicates the service and slice to which the downlink data belong, and wherein the wireless resource is a bandwidth formed by a plurality of time-frequency resources (step 454). • broadcasting information comprising an index of a respective option for each of at least one air interface building block of a first air interface configuration, each air interface building block having a predefined set of possible options each being associated with an index, and each air interface building block represents a set of parameters used to define an air interface configuration (step 450), • transmitting to a first user equipment, UE, or receiving from the first UE data by using the first air interface configuration for a first service in accordance with the broadcast information (step 452), • communicating with a second UE with a second air interface configuration for a second service, wherein the first service is in a first slice different from a second slice for the second service in the access network, wherein the first and second air interface configurations are respectively associated with different numerologies, and each numerology comprises at least two of the following parameters: sub-carrier spacing, symbol duration, or a cyclic prefix, CP, length; • when downlink data for one service among the first and second services arrive, transmitting the downlink data for the one service to a UE among the first and second UE to which the one service belongs by sending the downlink data in a wireless resource allocated for the one service, thereby, due to the sending of the downlink data on the wireless resource allocated to the one service, wherein the sending in the wireless resource indicates the service and slice to which the downlink data belong, and wherein the wireless resource is a bandwidth formed by a plurality of time-frequency resources (step 454). <EOS>