UE, a secondary ENB and a master ENB and respective method performed thereby for providing system information of a communication system to the UE

摘要

A UE, a MeNB, a SeNB and respective methods performed thereby are provided. The UE, the MeNB, and the SeNB are operable in a wireless communication system, the wireless communication system being adapted to provide for dual connectivity between the SeNB and a UE, and between the UE and a MeNB. The method is performed for providing system information of the wireless communication system to the UE and for the UE to acquire the system information. The method performed by the UE comprises receiving (110), from the SeNB, a MIB of a cell of the SeNB; and acquiring (120) a System Frame Number, SFN, from the MIB.

主权项

1. A method performed by a User Equipment (UE) operable in a wireless communication system, the wireless communication system being adapted to provide for dual connectivity between the UE and a Master evolved Node B (MeNB), and between the UE and a Secondary eNB (SeNB), the method being performed for acquiring system information of the wireless communication system, the method comprising:
receiving, from the MeNB, a System Frame Number (SFN) of the MeNB from a Master Information Block (MIB); and receiving, from the MeNB, an SFN offset relating to the offset between the SFN of the SeNB and the SFN of the MeNB by means of dedicated Radio Resource Control (RRC) signalling; wherein a starting time of radio frames in the MeNB is denoted t1 and a starting time of radio frames in the SeNB is denoted t2, wherein t2>t1 and a frame_offset is defined as t2−t1, and wherein:
when a time difference between a current moment t, and the next radio frame boundary of the SeNB is bigger than the frame_offset, then the SFN of the SeNB is defined as the SFN of the MeNB+the SFN offset; andwhen the time difference between the current moment t and the next radio frame boundary of the SeNB is smaller than the frame_offset, then the SFN of the SeNB is defined as the SFN of the MeNB+the SFN offset−1.