A token seizure method for DECT MAC ID Assignment
Original Publication Date: 2001-Apr-01
Included in the Prior Art Database: 2003-Jul-23
In a time division multiple access (TDMA) system like digital european cordless telephone (DECT) each physic channel has to be uniquely identified through a portable media access control (MAC) identity (PMID) in order to support the hand over. DECT standard specifies that when initiating a MAC connection, a portable, knowing nothing about the available unique PMID, can use a random number as default PMID. But ist uniqueness can not be ensured and so the hand over can not be safely performed. If it is not unique the base station will not send bearer confirm to portable and it has select another random number to repeat the process. Even if this process is finished with a unique number within the base station area, it is not certainly unique on the system level to support connection hand over. The network layer of the fixed part will temporarily use this default PMID link to assign a unique MAC identity to the portable as soon as possible. The old link based on the default PMID is then to be released and the connection is newly established on the assigned unique PMID. To overcome the disadvantages of the default PMID a method is presented to enable the portable to acquire a unique number as PMID at the very first MAC establish attempt and directly use it as the assigned PMID. This link identity will be used during the whole life cycle of the link with that base station. This uniquness make link release and reestablishment no longer necessary. There is also no need for explicit location procedure since an implicit location registration can be performed at fixed part side when a portable makes a connection setup attempt.