Importance

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Abstract

The applications relates to configuring a Discontinuous Reception DRX cycle Paging DRX cycle and connected mode DRX cycle are both limited by the current SFN cycle length., i.e. because the system frame number in the Master Information Block consists of only 8 bits the maximum SFN is 1023. Both DRX cycles can not be longer than the SFN cycle. The problem is solved in that the SFN parameter is extended. The extended SFN range and cycle enables an extension of both the paging DRX cycle and the long connected mode DRX cycle. As the bits in the MIB are costly, because they are frequently transmitted, using robust and thus costly coding, the proposed solution avoids adding bits to the SFN parameter in the MIB. Furthermore, extending the current SFN parameter in a separate parameter, backwards compatibility is maintained because a legacy user equipment will only read the original SFN parameter and ignore the new separate parameter. A suitable size of this new separate parameter, also referred to as SFN extension parameter, would be 10 bits, yielding a SFN cycle of almost 3 hours (2˜20*10 ms=174 minutes). A radio base station (12) controlling a cell (11) serving the user equipment (10) transmits system information comprising the above mentioned SFN extension parameter to the user equipment which configures a DRX cycle based now on both, the original SFN and the SFN extension parameter.

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First Claim