Data preservation
AssigneeTelefonaktiebolaget LM Ericsson
InventorsAnn-Christine Eriksson, Sandra Collins, Ingemar Backlund
Life of this patent
Estimating the term…
Abstract
A method ensures that data is not lost during an inter-Routing Area or inter-Network Service Entity cell change in a GPRS network. When a mobile station passes from one cell into another, a command is sent from the SGSN to the BSS serving the first cell, causing that BSS to discard any data awaiting transmission to the mobile station. A reply is sent from the BSS to the SGSN, and, in resonse thereto, the SGSN transmits data to the BSS serving the new cell, in order to ensure that all of the data intended for the mobile station is transmitted thereto.
Claims29
A method of controlling a cell change in a mobile communications network, in which data is transmitted from a core network node to a mobile station in packets, and in which data packets are stored in a respective radio access node before transmission to the mobile station, the method comprising:
- detecting a cell change of a mobile station, from a first cell served by a first cell radio access node to a second cell served by a second cell radio access node;
- sending a first message from the core network node to the first cell radio access node;
- in response to said first message, discarding any data packets stored in the first cell radio access node for transmission to the mobile station, and sending a reply message to the core network node;
- and
- in response to said reply message, transmitting said data packets, discarded in the first cell radio access node, from the core network node to the second cell radio access node.
A radio access node, for use in a mobile communications network, the radio access node comprising means for storing data packets before transmission to a mobile station, the radio access node further comprising:
- means for acting on a first message from a core network node indicating a cell change of a mobile station, by:
- discarding any data packets stored for transmission to the mobile station, and sending a reply message to the core network node, wherein said core network node is enabled to transmit said data packets, discarded in said radio access node, to the a second radio access node in response to said reply message.
A core network node for use in a mobile communications network, in which data is transmitted from the core network node to a mobile station in packets, and in which data packets are stored in a respective radio access node before transmission to the mobile station, the core network node comprising:
- means for detecting a cell change of a mobile station, from a first cell served by a first cell radio access node to a second cell served by a second cell radio access node;
- means for sending a first message from the core network node to the first cell radio access node in response to a cell change detection, said first message causing the first cell radio access node to delete stored data packets intended for transmission to the mobile station;
- means for receiving a reply to said first message and, in response to said reply, transmitting said data packets, discarded in the first cell radio access node, from the core network node to the second cell radio access node.
Dependencies are inferred from the claim text.