Packet transmission in telecommunication network
US6563825B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1999 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | May 13, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/14
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a packet radio network, the position updates of a mobile station are transmitted in UI frames, whose priority is higher than that of I frames which transmit payload traffic and whose header comprises the cell for identifier of the mobile station. If the mobile station moves from a first cell to a second, an SGSN node can receive the I frame later than the UI frame giving the location update; the SGSN node thus incorrectly concluding that the mobile station has returned to the first cell. The incorrect location update is prevented in such a way that: (i) the transmitter or a following network element provides at least some frames with a sequence identifier, which is not dependent on the frame type; and (ii) at least one network element receiving the frame observes the sequence identifier of the frames and concludes that the location and/or routing information of the frame is incorrect, if the sequence identifier shows that the frame is older than a previously received frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.