An electronic device, ED, comprising: a processing unit configured to execute instructions to cause the ED to: receive, via dynamic signaling, from a first serving cell, with which the ED initially has a primary connection, a role change trigger wherein the role change trigger causes the ED to use a connection with a second serving cell, with which the ED initially has a secondary connection, as the primary connection instead of the first serving cell; characterised in that the role change trigger is received in a downlink control information, DCI, signal, the DCI signal including at least two fields containing all '0' or all '1', the at least two fields being at least two of: a hybrid automatic repeat request, HARQ, process field, a modulation and coding scheme, MCS, field, a new data indicator, NDI, field, or a redundancy version field; wherein the instructions further cause the ED to recognize the two fields containing all '0' or all '1' as indicating the role change trigger; and wherein the DCI signal includes at least one field having no predetermined value, the at least one field being at least one of: a transmit power control, TPC, field, a physical uplink control channel, PUCCH, resource field, or a hybrid automatic repeat request, HARQ, timing field; wherein the at least one field having no predetermined value contains information useable by the ED to provide feedback. a processing unit configured to execute instructions to cause the ED to: receive, via dynamic signaling, from a first serving cell, with which the ED initially has a primary connection, a role change trigger wherein the role change trigger causes the ED to use a connection with a second serving cell, with which the ED initially has a secondary connection, as the primary connection instead of the first serving cell; characterised in that the role change trigger is received in a downlink control information, DCI, signal, the DCI signal including at least two fields containing all '0' or all '1', the at least two fields being at least two of: a hybrid automatic repeat request, HARQ, process field, a modulation and coding scheme, MCS, field, a new data indicator, NDI, field, or a redundancy version field; wherein the instructions further cause the ED to recognize the two fields containing all '0' or all '1' as indicating the role change trigger; and wherein the DCI signal includes at least one field having no predetermined value, the at least one field being at least one of: a transmit power control, TPC, field, a physical uplink control channel, PUCCH, resource field, or a hybrid automatic repeat request, HARQ, timing field; wherein the at least one field having no predetermined value contains information useable by the ED to provide feedback. receive, via dynamic signaling, from a first serving cell, with which the ED initially has a primary connection, a role change trigger wherein the role change trigger causes the ED to use a connection with a second serving cell, with which the ED initially has a secondary connection, as the primary connection instead of the first serving cell; characterised in that the role change trigger is received in a downlink control information, DCI, signal, the DCI signal including at least two fields containing all '0' or all '1', the at least two fields being at least two of: a hybrid automatic repeat request, HARQ, process field, a modulation and coding scheme, MCS, field, a new data indicator, NDI, field, or a redundancy version field; wherein the instructions further cause the ED to recognize the two fields containing all '0' or all '1' as indicating the role change trigger; and wherein the DCI signal includes at least one field having no predetermined value, the at least one field being at least one of: a transmit power control, TPC, field, a physical uplink control channel, PUCCH, resource field, or a hybrid automatic repeat request, HARQ, timing field; wherein the at least one field having no predetermined value contains information useable by the ED to provide feedback.