Patent ID: 8140081

Claim:
A Code Division Multiple Access, CDMA, cellular communication system comprising: a first base station supporting a remote station making uplink transmissions using an uplink scrambling code in a first cell; scrambling code means arranged to determine a first set of uplink scrambling codes from an identity of the first remote station and to select the uplink scrambling code from the first set, the first set having a unique dependency from the identity; a first access point supporting a second cell and comprising: means for determining a group of remote stations registered at the access point, the group of remote stations comprising the first remote station; means for determining associated uplink scrambling codes for the group of remote stations, a first associated uplink scrambling code of the first remote station being a scrambling code of the first set of uplink scrambling codes; means for monitoring for received signals using the associated uplink scrambling codes; handover detection means arranged to generate a potential handover detection for a handover of the first remote station from the first cell to the second cell in response to a detection of a received signal using the first associated uplink scrambling code; and handover means for temporarily transmitting a handover pilot signal using a handover pilot signal scrambling code in response to the potential handover detection, the pilot signal scrambling code being comprised in a neighbour list for the remote station.