EFFICIENT DISCARD MECHANISM IN SMALL CELL DEPLOYMENT
First Claim
1. An evolved packet core (EPC) comprising:
- control circuitry, which, in operation, establishes a S1-U connection with a master base station of an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) when the E-UTRAN supports a dual connectivity operation whereby a mobile station is connectable to the master base station and a secondary base station; and
a transmitter, which is coupled to the control circuitry and which, in operation, transmits data packets to the master base station via the S1-U connection;
wherein,the master base station is configured to transmit the data packets destined for the mobile station via the secondary base station to the mobile station in the dual connectivity operation;
the master base station transmits the data packets as PDCP PDUs (Packet Data Convergence Protocol, Protocol Data Units) received via the S1-U connection to the secondary base station;
the master base station receives an indication from the secondary base station, the indication including first information on the PDCP PDUs transmitted from the master base station and successfully delivered by the secondary base station to the mobile station and second information on the PDCP PDUs transmitted from the master base station and unsuccessfully delivered by the secondary base station to the mobile station;
the first information includes a highest sequence number of the PDCP PDU successfully delivered by the secondary base station to the mobile station and the second information includes sequence numbers of an oldest lost PDCP PDU and a most recently lost PDCP PDU such that the sequence numbers indicate a range of consecutively lost PDCP PDUs; and
the master base station considers buffer capacity of the secondary base station in controlling the secondary base station.
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Abstract
The invention relates to a method for efficiently discarding data packets destined to a mobile station connected to both a master base station and a secondary base station. The master base station configures a secondary discard function in a lower layer of the secondary base station, based on the master discard function in the higher layer of the master base station. The master base station forwards the data packet from the higher layer to the lower of the secondary base station. The secondary discard function of the lower layer at the secondary base station discards the received data packet upon expiry of the secondary timer started by the lower layer upon reception of the data packet from the higher layer at the master base station.
1 Citation
6 Claims
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1. An evolved packet core (EPC) comprising:
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control circuitry, which, in operation, establishes a S1-U connection with a master base station of an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) when the E-UTRAN supports a dual connectivity operation whereby a mobile station is connectable to the master base station and a secondary base station; and a transmitter, which is coupled to the control circuitry and which, in operation, transmits data packets to the master base station via the S1-U connection; wherein, the master base station is configured to transmit the data packets destined for the mobile station via the secondary base station to the mobile station in the dual connectivity operation; the master base station transmits the data packets as PDCP PDUs (Packet Data Convergence Protocol, Protocol Data Units) received via the S1-U connection to the secondary base station; the master base station receives an indication from the secondary base station, the indication including first information on the PDCP PDUs transmitted from the master base station and successfully delivered by the secondary base station to the mobile station and second information on the PDCP PDUs transmitted from the master base station and unsuccessfully delivered by the secondary base station to the mobile station; the first information includes a highest sequence number of the PDCP PDU successfully delivered by the secondary base station to the mobile station and the second information includes sequence numbers of an oldest lost PDCP PDU and a most recently lost PDCP PDU such that the sequence numbers indicate a range of consecutively lost PDCP PDUs; and the master base station considers buffer capacity of the secondary base station in controlling the secondary base station. - View Dependent Claims (2, 3)
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4. A method implemented in an evolved packet core (EPC), the method comprising:
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establishing a S1-U connection with a master base station of an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) when the E-UTRAN supports a dual connectivity operation whereby a mobile station is connectable to the master base station and a secondary base station; and transmitting data packets to the master base station via the S1-U connection; wherein, the master base station is configured to transmit the data packets destined for the mobile station via the secondary base station to the mobile station in the dual connectivity operation; the master base station transmits the data packets as PDCP PDUs (Packet Data Control Protocol, Protocol Data Units) received via the S1-U connection to the secondary base station; the master base station receives an indication from the secondary base station, the indication including first information on the PDCP PDUs transmitted from the master base station and successfully delivered by the secondary base station to the mobile station and second information on the PDCP PDUs transmitted from the master base station and unsuccessfully delivered by the secondary base station to the mobile station; the first information includes a highest sequence number of the PDCP PDU successfully delivered by the secondary base station to the mobile station and the second information includes sequence numbers of an oldest lost PDCP PDU and a most recently lost PDCP PDU such that the sequence numbers indicate a range of consecutively lost PDCP PDUs; and the master base station considers buffer capacity of the secondary base station in controlling the secondary base station. - View Dependent Claims (5, 6)
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Specification