In some embodiments, the buffer state monitoring module 19a is configured to monitor the rate at which the buffer state changes and the congestion detection module 19b is configured to determine the condition indicative of congestion in response to said buffer change rate exceeding the predetermined limit. For example, in one embodiment, the buffer state monitoring module 19a is configured to monitor the rate at which the buffer state fills and the congestion detection module 19b is configured to determine the condition indicative of congestion in response to said buffer fill rate exceeding the predetermined limit.
Reference is now made to