Radio telecommunications system with improved use of air interface (II)
View Patent ↗In a General Packet Radio Service (GPRS) system in which a Serving GPRS Support Node operates a leaky bucket algorithm to control data flow, a packet control unit in the base station is arranged so that on connection of a new mobile, a flow control message in the form of new values of B the maximum bucket capacity and R the leak rate is sent to the Serving GPRS Support Node only when it is known that the new connection is non-bursty. In the Temporary Block Flow queue for the new connection, a threshold is set at a queue length which ensures that at least two Logical Link Layer-Protocol Data Units are received before the threshold is reached. New values of B and R are then sent, the new value of B being related to the maximum data capacity of the newly connected mobile.
1. A packet based telecommunications system comprising a base station, a first data transmission means between the base station and a plurality of users, and a second data transmission means between the base station and a serving node,
the serving node using a leaky bucket algorithm to control data flow,
and the base station being arranged to determine if data traffic of a new user is bursty or non-bursty when said new user is connected over the first transmission means,
wherein, for data traffic of a user determined to be non-bursty, at least one flow control message is sent to the serving node to set parameters of the leaky bucket algorithm in dependence on data characteristics of said user,
and wherein, for data traffic of a user determined to be bursty, if only one packet of data is received in a stream, then no flow control message is sent to the serving node from the base station, such that said parameters are not set in dependence on data characteristics of the bursty user.
2. The system of claim 1 in which on connection of the new user a temporary block flow queue for that user is set up, and a threshold length is set, and when the queue reaches the threshold, the flow control message is sent.
3. The system of claim 2 in which the flow control message specifies bucket size B and leak rate R values related to the maximum data capacity of the new user.
4. The system of claim 3 in which the system is a GPRS system, and the values of B and R are independent of the actual throughput of the air interface Um.
5. The system of claim 4 in which the threshold length is set so that the temporary block flow queue receives at least two logical link layer protocol data units before the threshold is reached and a mobile station (MS) flow control message is sent.
6. The system of claim 1 wherein a user is determined to be non-bursty if more than one packet of data is received in a stream at the base station on connection of said user.