Determination of characteristics during the transition between an AAL2 signalling and another signalling
View Patent ↗The invention relates to a method and device for simple and efficient determining characteristics during a transition between an AAL2 signalling protocol and at least one another signalling protocol of at least one communication network. The inventive method and device are characterised in that at least one characteristic is determined on the basis of parametric values assigned to the AA2 signalling protocol and in that the determined characteristics are used for reproducing the parametric values of the AA2 signalling protocol in the parametric values of another signalling protocol.
1. A method for transitioning an AAL2 signaling protocol into at least one further signaling protocol of at least one communication network, comprising:
in processing unit, determining at least one characteristic from the parameter values specified for the AAL2 signaling protocol; and
in the processing unit, using the determined characteristics for mapping parameter values of the AAL2 signaling protocol into parameter values of the further signaling protocol, wherein a transition is performed to convert the Link Characteristics parameter values of the AAL2 signaling protocol to the Transfer Capabilities parameter values of the AAL2 signaling protocol;
wherein a transition is performed to convert the Link Characteristics parameter values of the AAL2 signaling protocol to the IP Transfer Capability parameter values of a signaling protocol for IP connections; and
wherein in order to determine the bit rate for the transition of the Link Characteristics parameter values of the AAL2 signaling protocol to the IP Transfer Capability parameter values of a signaling protocol for IP connections, a minimum header bit rate on the IP side is determined from a number of data packets per time unit of the peak rate at maximum packet size and the bit rate is determined in conjunction with the peak byte rate.
2. The method as claimed in claim 1 , wherein a transition is performed to convert the Preferred Link Characteristics parameter values of the AAL2 signaling protocol to the Preferred Transfer Capabilities parameter values of the AAL2 signaling protocol.
3. The method as claimed in claim 1 , wherein a transition is performed to convert the Preferred Link Characteristics parameter values of the AAL2 signaling protocol to the Preferred IP Transfer Capability parameter values of a signaling protocol for IP connections.
4. The method as claimed in claim 1 wherein the transition of parameter values of the AAL2 signaling protocol to a further signaling protocol is performed on the basis of an Establish Request or Modify Request.
5. The method as claimed in claim 1 wherein the bit rates, the maximum permitted packet size, the maximum CPS-SDU size, the average CPS-SDU size, the SSISU parameter or the IP Transfer Capability class are determined as characteristics of parameter values.
6. The method as claimed in claim 1 , wherein in order to determine the bit rate for the transition of the Link Characteristics parameter values of the AAL2 signaling protocol to the Transfer Capabilities parameter values of the AAL2 signaling protocol, the number of peak rate data packets per time unit relative to the average CPS-SDU size is established and the bit rate determined in conjunction with the length of a packet header.
7. The method as claimed in claim 1 , wherein the maximum permitted packet size is determined from the maximum CPS-SDU size, the maximum length of the SSSAR-SDU and the length of the IP packet header.
8. The method as claimed in claim 1 , wherein during the determination of the characteristics a normalization to an integral multiple of 64 bits per second is performed.
9. The method as claimed in claim 1 , wherein at least one of the maximum CPS-SDU size and average CPS-SDU size are/is determined from the minimum of the maximum permitted packet size minus the length of the header of the IP packet of the IP Transfer Capability or Preferred IP Transfer Capability and the maximum permissible CPS-SDU size.
10. The method as claimed in claim 1 , wherein the SSISU parameter is determined from the maximum of the maximum permitted packet size minus the length of the header of the IP packet of the IP Transfer Capability, the maximum permitted packet size minus the length of the header of the IP packet of the Preferred IP Transfer Capability and the maximum permissible CPS-SDU size.
11. The method as claimed in claim 10 , wherein the Desired Bandwidth Transfer Capability is chosen on the basis of previously defined conditions in relation to at least one of the link characteristics and MS link characteristics of an Establish Request from an AAL2 network and that if at least one of said conditions is not met, the Statistical Bandwidth Transfer Capability will be used as the IP Transfer Capability class.
12. The method as claimed in claim 11 , wherein the IP Transfer Capability class is determined upon reception of an Establish Request from an interworking unit.
13. The method as claimed claim 1 , wherein the IP packet header, the UDP header and, for connections that use RTP, the RTP header are used for determining the length of the IP packet header.
14. The method as claimed in claim 1 , herein the characteristics for the transition of the AAL2 signaling protocol to a signaling protocol for IP connections are determined in an interworking unit.
15. The method as claimed in claim 1 , wherein the characteristics for the transition of the AAL2 signaling protocol to a further AAL2 signaling protocol are determined in an AAL2 switching device.
16. A device for transitioning an AAL2 signaling protocol into at least one further signaling protocol of at least one communication network, comprising:
a receive unit for receiving parameter values of an AAL2 signaling protocol;
a processing unit for determining at least one characteristic from parameter values specified for the AAL2 signaling protocol and for mapping parameter values of the AAL2 signaling protocol into Transfer Capability parameter values of the further signaling protocol; and
a transmit unit for transmitting the mapped parameter values of the further signaling protocol, wherein a transition is performed to convert the Link Characteristics parameter values of the AAL2 signaling protocol to the Transfer Capabilities parameter values of the AAL2 signaling protocol;
wherein a transition is performed to convert the Link Characteristics parameter values of the AAL2 signaling protocol to the IP Transfer Capability parameter values of a signaling protocol for IP connections; and
wherein in order to determine the bit rate for the transition of the Link Characteristics parameter values of the AAL2 signaling protocol to the IP Transfer Capability parameter values of a signaling protocol for IP connections, a minimum header bit rate on the IP side is determined from a number of data packets per time unit of a peak rate at maximum packet size and the bit rate is determined in conjunction with the peak byte rate.
17. The device as claimed in claim 16 , wherein an AAL2 switching unit is provided as the device.
18. The device as claimed in claim 16 , wherein an interworking unit is provided as the device.