Methods and apparatus for synchronizing a user equipment with an HFN offset
US9532268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2014 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Aug 8, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W56/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and devices are described for wireless communication at a user equipment (UE). In some examples, the UE may identify an initialization and refresh (IR) packet at the radio link control (RLC) layer based the size of the IR packet, where the IR packet comprises a larger ciphered PDU size than a compressed RoHC packet. Accordingly, once the UE identifies the received packet as an IR packet, the UE may attempt to decipher the IR packet using one or more HFN offset values. In one example, the UE may determine whether the IR packet is deciphered correctly based on cyclic redundancy check (CRC) value of the deciphered IR packet. As a result, the present disclosure allows the UE to re-synchronize with the transmitting device by at least one of incrementing or decrementing an HFN value at the receiving device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.