A system for an access control, the system comprising: means for receiving (S1) by a network device (ND) a request (ReqA) containing an identifier (IdU) of a user device (UD), a one-time password (OTP) and an access request, from the user device (UD), means for transmitting (S2) by the network device (ND) another request (ReqC) to a control device (CD), said another request (ReqC) containing the identifier (IdU) of the user device (UD) and an identifier (IdND) of the network device (ND), means for transmitting by the control device (CD) said another request (ReqC) through an ultra narrow band radio connection to an authentication server (AS) that grants access rights attributed to the user device (UD) for the network device (ND) by checking the identifier (IdU) of the user device (UD) and the identifier (IdND) of the network device (ND), and means for receiving by the control device (CD) an access token encrypted with the one-time password (OTP) and containing granted access rights from the authentication server (AS) through an ultra narrow band radio connection, means for receiving (S7) by the network device (ND) the access token from the control device (CD), means for decrypting (S8) by the network device (ND) the access token with the one-time password (OTP) to apply the granted access rights attributed to the user device (UD). means for receiving (S1) by a network device (ND) a request (ReqA) containing an identifier (IdU) of a user device (UD), a one-time password (OTP) and an access request, from the user device (UD), means for transmitting (S2) by the network device (ND) another request (ReqC) to a control device (CD), said another request (ReqC) containing the identifier (IdU) of the user device (UD) and an identifier (IdND) of the network device (ND), means for transmitting by the control device (CD) said another request (ReqC) through an ultra narrow band radio connection to an authentication server (AS) that grants access rights attributed to the user device (UD) for the network device (ND) by checking the identifier (IdU) of the user device (UD) and the identifier (IdND) of the network device (ND), and means for receiving by the control device (CD) an access token encrypted with the one-time password (OTP) and containing granted access rights from the authentication server (AS) through an ultra narrow band radio connection, means for receiving (S7) by the network device (ND) the access token from the control device (CD), means for decrypting (S8) by the network device (ND) the access token with the one-time password (OTP) to apply the granted access rights attributed to the user device (UD). means for transmitting by the control device (CD) said another request (ReqC) through an ultra narrow band radio connection to an authentication server (AS) that grants access rights attributed to the user device (UD) for the network device (ND) by checking the identifier (IdU) of the user device (UD) and the identifier (IdND) of the network device (ND), and means for receiving by the control device (CD) an access token encrypted with the one-time password (OTP) and containing granted access rights from the authentication server (AS) through an ultra narrow band radio connection, means for receiving (S7) by the network device (ND) the access token from the control device (CD), means for decrypting (S8) by the network device (ND) the access token with the one-time password (OTP) to apply the granted access rights attributed to the user device (UD). <EOS>