User device for a wireless communication system , the user device comprising a transceiver configured to: receive a first Radio Network Temporary Identifier, RNTI, wherein the first RNTI is valid for a first set of network nodes (20a, 20b,..., 20n) of a radio communication network ; receive at least one second RNTI, wherein the second RNTI is valid for a second set of network nodes (20a, 20b,..., 20n) of the radio communication network , and wherein the first set of network nodes (20a, 20b,..., 20n) and the second set of network nodes (20a, 20b,..., 20n) are different sets of network nodes (20a, 20b,..., 20n); transmit data to the radio communication network , or receive data from the radio communication network , using the first RNTI or the second RNTI; wherein using the first RNTI or the second RNTI are given by RNTI selection rules, wherein the RNTI selection rules for using the first RNTI or the second RNTI are dependent on one or more parameters in the group comprising: geographic location of the user device ; serving network node identity; detected neighbour network nodes; mobility for the user device ; and RNTI communication failure; and wherein the user device further comprises a processor configured to provide the RNTI selection rules, or wherein the transceiver is further configured to receive a RNTI control message from the radio communication network comprising the RNTI selection rules; and wherein the transceiver is further configured to: transmit data to the radio communication network , or receive data from the radio communication network , using the first RNTI or the second RNTI according to the RNTI selection rules. receive a first Radio Network Temporary Identifier, RNTI, wherein the first RNTI is valid for a first set of network nodes (20a, 20b,..., 20n) of a radio communication network ; receive at least one second RNTI, wherein the second RNTI is valid for a second set of network nodes (20a, 20b,..., 20n) of the radio communication network , and wherein the first set of network nodes (20a, 20b,..., 20n) and the second set of network nodes (20a, 20b,..., 20n) are different sets of network nodes (20a, 20b,..., 20n); transmit data to the radio communication network , or receive data from the radio communication network , using the first RNTI or the second RNTI; wherein using the first RNTI or the second RNTI are given by RNTI selection rules, wherein the RNTI selection rules for using the first RNTI or the second RNTI are dependent on one or more parameters in the group comprising: geographic location of the user device ; serving network node identity; detected neighbour network nodes; mobility for the user device ; and RNTI communication failure; and wherein the user device further comprises a processor configured to provide the RNTI selection rules, or wherein the transceiver is further configured to receive a RNTI control message from the radio communication network comprising the RNTI selection rules; and wherein the transceiver is further configured to: transmit data to the radio communication network , or receive data from the radio communication network , using the first RNTI or the second RNTI according to the RNTI selection rules. <EOS>