The present invention relates to a shoe, in particular a sports shoe, having a flexible upper surrounding a foot, a closure panel arranged on an instep area of the flexible upper, and a tightening element arranged at the heel of the shoe. The invention further relates to a corresponding device for performing the method. The apparatus is equipped with detection means for detecting operating states, processing means, storage means and output means. A method comprising the step of using a guard sequence in a guard interval of OFDM symbols of the received TDS-OFDM signals in the downlink to estimate a received signal power or an interference power is provided. In one embodiment, the method includes, responsive to receipt of a removal request, performing a role evaluation of the removal request to generate a policy request; performing a policy evaluation of the policy request; generating a policy response in accordance with the policy evaluation; and enforcing the policy response.