A method in a first wireless station of establishing a connection with a second wireless station according to an Institute of Electrical and Electronics Engineers, IEEE, 802.11 wireless standard, comprising: generating a frame including a capabilities element having: a capabilities element length field appended to a capabilities identifier field, the capabilities element length field containing an element length value indicating the length of the capabilities element, a core capabilities field having a fixed length and being appended after the capabilities element length field, the core capabilities field containing a predefined sequence of core subfields having respective predefined lengths; the core subfields containing respective first core values defining core capabilities of the first wireless station, wherein respective core capabilities fields generated by the first wireless station and the second wireless stations convey parameters for the same set of capabilities which include a value defining MAC protocol data unit, MPDU, aggregation parameters, as well as a value defining training, TRN, parameters and a value defining supported modulation and coding scheme, MCS, parameters and wherein each wireless station defines its specific values for the same set of capabilities; and at least one extended capability field having a variable length and appended to the core capabilities field, wherein each wireless station may generate a different set of extended capabilities fields, the at least one extended capability field containing: an extended capability identifier subfield containing an identifier of one of a plurality of predefined extended capabilities; an extended capability length subfield containing an extended capability length value; and an extended capability payload subfield having a length equal to the extended capability length value; the payload subfield containing a first extended value defining an extended capability of the first wireless station; responsive to generating the frame, transmitting the frame; receiving capabilities information corresponding to the second wireless station; and establishing the connection with the second wireless station based on compatibility between the capabilities information, the core capabilities of the first wireless station, and the extended capability of the first wireless station. a capabilities element length field appended to a capabilities identifier field, the capabilities element length field containing an element length value indicating the length of the capabilities element, a core capabilities field having a fixed length and being appended after the capabilities element length field, the core capabilities field containing a predefined sequence of core subfields having respective predefined lengths; the core subfields containing respective first core values defining core capabilities of the first wireless station, wherein respective core capabilities fields generated by the first wireless station and the second wireless stations convey parameters for the same set of capabilities which include a value defining MAC protocol data unit, MPDU, aggregation parameters, as well as a value defining training, TRN, parameters and a value defining supported modulation and coding scheme, MCS, parameters and wherein each wireless station defines its specific values for the same set of capabilities; and at least one extended capability field having a variable length and appended to the core capabilities field, wherein each wireless station may generate a different set of extended capabilities fields, the at least one extended capability field containing: an extended capability identifier subfield containing an identifier of one of a plurality of predefined extended capabilities; an extended capability length subfield containing an extended capability length value; and an extended capability payload subfield having a length equal to the extended capability length value; the payload subfield containing a first extended value defining an extended capability of the first wireless station; an extended capability identifier subfield containing an identifier of one of a plurality of predefined extended capabilities; an extended capability length subfield containing an extended capability length value; and an extended capability payload subfield having a length equal to the extended capability length value; the payload subfield containing a first extended value defining an extended capability of the first wireless station; responsive to generating the frame, transmitting the frame; receiving capabilities information corresponding to the second wireless station; and establishing the connection with the second wireless station based on compatibility between the capabilities information, the core capabilities of the first wireless station, and the extended capability of the first wireless station.