Dynamic transport channel synchronization

A device configured to be a radio access network supervising entity, for adapting to delay in a communication link established between the device and at least one radio base station communicating with a mobile terminal, the device comprising a processing unit being arranged to:

• associate a target Connection Frame Number (CFN) to each transmitted data frame, said target CFN being calculated by offsetting an expected CFN with a counter value corresponding to a current communication link delay associated with a first communication link between the device and a first radio base station communicating with the mobile terminal;
• determine delay of the first communication link;
• adapt to the delay of the first communication link by adjusting transmission time of the transmitted data frame or adjusting the target CFN of the transmitted data frame, said target CFN being calculated by offsetting the expected CFN with a counter value corresponding to the determined delay
• establish a second communication link between the device and a second radio base station;
• determine delay for each of the first and second communication links;
• identify a greatest delay from determining of the delay of each of the first and second communication links;
• and
• adapt delay of each of the first and second communication links by advancing the transmission time of the transmitted data frame to reflect the greatest delay or by advancing the target CFN to reflect the greatest delay.

A non-transitory machine-readable storage medium having computer code stored therein, which when executed by a set of one or more processors of a device configured to be a radio access network supervising entity, for adapting to delay in a communication link established between the device and at least one radio base station communicating with a mobile terminal, causes the device to perform operations comprising:

• associating a target Connection Frame Number (CFN) to each transmitted data frame, said target CFN being calculated by offsetting an expected CFN with a counter value corresponding to a current communication link delay associated with a first communication link between the radio access network supervising entity and a first radio base station communicating with the mobile terminal;
• determining delay of the first communication link;
• adapting to the delay of the first communication link by adjusting transmission time of the transmitted data frame or adjusting the target CFN of the transmitted data frame, said target CFN being calculated by offsetting the expected CFN with a counter value corresponding to the determined delay;
• establishing a second communication link between the radio access network supervising entity and a second radio base station;
• determining delay for each of the first and second communication links;
• identifying a greatest delay from the determining of the delay of each of the first and second communication links;
• and
• adapting delay of each of the first and second communication links by advancing the transmission time of the transmitted data frame to reflect the greatest delay or by advancing the target CFN to reflect the greatest delay.