Mitigation of traffic congestion in dual connectivity systems
AssigneeIntel IP Corporation
InventorsKathiravetpillai Sivanesan, Ali Koc, Rath Vannithamby
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Abstract
Technology for mitigating traffic congestion is disclosed. A master evolved node B (MeNB) can identify service data unit (SDU) packets that are dropped in a retransmission buffer of a packet data convergence protocol (PDCP) layer of the MeNB. The MeNB can create a list of packet data unit (PDU) packets that are dropped at the PDCP layer of the MeNB, wherein the PDU packets that are dropped are associated with the SDU packets. The MeNB can send the list of dropped PDU packets, from the PDCP layer of the MeNB to the PDCP layer of a user equipment (UE), to enable the UE to distinguish between delayed PDU packets and the dropped PDU packets.
Claims22
A master evolved node B (MeNB) operable to mitigate traffic congestion, the MeNB having computer circuitry configured to:
- identify service data unit (SDU) packets that are dropped in a retransmission buffer of a packet data convergence protocol (PDCP) layer of the MeNB;
- create a list of packet data unit (PDU) packets that are dropped at the PDCP layer of the MeNB, wherein the PDU packets that are dropped are associated with the SDU packets;
- and
- send the list of dropped PDU packets, from the PDCP layer of the MeNB to the PDCP layer of a user equipment (UE), to enable the UE to distinguish between delayed PDU packets and the dropped PDU packets.
A method for mitigating traffic congestion, the method comprising:
- detecting a potential overflow at a retransmission buffer of a packet data convergence protocol (PDCP) layer of a user equipment (UE), wherein packet data unit (PDU packets) are stored in the retransmission buffer for retransmission in downlink to one of a master evolved node B (MeNB) or a secondary evolved node B (SeNB);
- detecting a type of traffic associated with the PDU packets;
- and
- extending a discard counter at the retransmission buffer based in part on the type of traffic associated with the PDU packets in order to avoid premature flushing of the PDU packets at the retransmission buffer.
A master evolved node B (MeNB) operable to mitigate traffic congestion, the MeNB having computer circuitry configured to:
- determine that a retransmission buffer at the MeNB is storing a number of packets that exceed a selected threshold level;
- adjust a downlink (DL) split ratio for the packets in the retransmission buffer, wherein the packets are to be sent to a secondary evolved node B (SeNB) or directly from the MeNB to a user equipment (UE);
- and
- split a bearer in the PDCP layer of the MeNB based on the adjusted DL split ratio to enable the UE and the SeNB to receive the packets in the retransmission buffer from the MeNB according to the adjusted DL split ratio.
Dependencies are inferred from the claim text.