Node for use in positioning of a wireless unit, and related methods and systems

System for use in positioning of a wireless unit, the system comprising:

• a node;
• a base station;
• and
• a wireless device,
• wherein the node comprises:
• a first transmitter arranged to broadcast system information arranged to trigger a registration, wherein the system information comprises a first registration area code;
• a first receiver arranged to receive registration requests from wireless devices in receipt of the system information,
• wherein the node is arranged to:
• in response to any registration request received, transmit, via the first transmitter, a response indicating that the registration request is rejected, and to change the first registration area code to a second registration area code when a registration area code update condition is met;
• and
• transmit, via the first transmitter, a node identifier indicating an identity of the node;
• wherein the registration area code update condition comprises at least one of:
• a first timer has expired wherein the first timer is initialized upon transmission of the registration request rejection, and
• a number of registration request rejections transmitted by the node within a time window has exceeded a threshold;
• wherein the wireless device comprises:
• a second receiver arranged to receive broadcasted system information from the node;
• a second transmitter arranged to transmit a registration request to the node,
• wherein the wireless device is further arranged to:
• receive, via the second receiver, a response from the node indicating that the registration request is rejected;
• receive, via the second receiver, the node identifier from the node, and
• transmit, via the second transmitter, the node identifier to the base station.