Method for synchronizing PDCP operations after RRC connection re-establishment in a wireless communication system and related apparatus thereof
AssigneeHTC Corporation
InventorChih-Hsiang Wu
Life of this patent
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Abstract
A method used in an E-UTRAN for synchronizing PDCP operations after a RRC connection re-establishment procedure with a user equipment (UE) is provided. The method includes: initiating an RRC reconfiguration procedure to resume all radio bearers other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established; re-transmitting a designated group of PDCP Service Data Units (SDUs) to the UE when a data radio bearer (DRB) mapped on Radio Link Control (RLC) Acknowledged Mode (AM) is resumed.
Claims10
A communication device for synchronizing Packet Data Convergence Protocol (PDCP) operations with another communication device, the communication device comprising:
- means for initiating an RRC Reconfiguration procedure to resume a radio bearer other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established;
- means for transmitting a group of PDCP Service Data Units (SDUs) when the radio bearer (RB) is resumed;
- means for generating a new base-key (KeNB) corresponding to a Radio Resource Control (RRC) connection re-establishment procedure, and generating a new ciphering key from the new KeNB;
- and
- means for utilizing the new ciphering key to cipher the transmitted PDCP SDUs when the RRC connection is re-established.
A communication device for synchronizing Packet Data Convergence Protocol (PDCP) operations with another communication device, the communication device comprising:
- means for resuming a radio bearer other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established;
- means for receiving a group of PDCP Service Data Units (SDUs) transmitted from the other communication device when the radio bearer (RB) is resumed;
- means for generating a new base-key (KeNB) corresponding to a Radio Resource Control (RRC) connection re-establishment procedure, and generating a new ciphering key from the new KeNB;
- and
- means for utilizing the new ciphering key to decipher the received PDCP SDUs when the RRC connection is re-established.
A method of synchronizing Packet Data Convergence Protocol (PDCP) operations with a user equipment (UE), the method comprising:
- initiating an RRC Reconfiguration procedure to resume a radio bearer other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established;
- transmitting a group of PDCP Service Data Units (SDUs) to the UE when the radio bearer (RB) is resumed;
- generating a new base-key (KeNB) corresponding to a Radio Resource Control (RRC) connection re-establishment procedure, and generating a new ciphering key from the new KeNB;
- and
- utilizing the new ciphering key to cipher the transmitted PDCP SDUs when the RRC connection is re-established.
A method synchronizing Packet Data Convergence Protocol (PDCP) operations with an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), the method comprising:
- resuming a radio bearer other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established;
- receiving a group of PDCP Service Data Units (SDUs) transmitted from the E-UTRAN when the radio bearer (RB) is resumed;
- generating a new base-key (KeNB) corresponding to a Radio Resource Control (RRC) connection re-establishment procedure, and generating a new ciphering key from the new KeNB;
- and
- utilizing the new ciphering key to decipher the received PDCP SDUs when the RRC connection is re-established.
Dependencies are inferred from the claim text.