GPRS Radio Resource Management Traffic Model The definition of a GPRS session in our model: Packet 1 Packet 2 Packet 3 Packet Call1 Packet Call 2 Packet Call 3 Session1 Session2 Session3 Time[ s] Time[ m] Time[ h] Group 896 GPRS Radio Resource Management

GPRS Radio Resource Management Traffics: Mixture of GSM Voice calls and GPRS Data sessions Each session/call was randomly assigned to a Mobile Station(MS), where each MS only represent a propagation condition(C/I) corresponding to a certain distance from the BTS. Group 896 GPRS Radio Resource Management

GPRS Radio Resource Management Traffic Generation Method Group 896 GPRS Radio Resource Management

GPRS Radio Resource Management Model Assumptions 1 session assigned to 1MS corresponding to a certain radio condition 1MS can have multiple sessions based on radio condition All the sessions are in the BSS to be transmitted No Handover Based on one Cell Configuration No uplink simulation Higher layers(TCP/IP, LLC) is not considered ARQ for uplink is not considered Group 896 GPRS Radio Resource Management

GPRS Radio Resource Management Parameters List Parameters Stochastic Process Parameter Values GSM Arrival Time Exponential Holding Time GPRS Session Size Geometrical P=0.5 Object Size = 50 Kbytes Mean Session Size=100Kbytes In traffic generator while calculating the mean GPRS holding time: We use average data speed: 25kbps. Which comes from some simulation output on different traffic load. Traffic Load = 5 ~ 29 Erlang GSM Voice: Traffic_Load*70% GPRS Data: Traffic_Load*30% Group 896 GPRS Radio Resource Management

Mapping GPRS session to RLC blocks Session size (bits) GPRS SESSION time CS-x RLC blocks arrival time Mapping to block We map a GPRS session( a number of bits) only into RLC blocks and simplify the upper layers. Because in simulation the transmission was working on RLC block level. Group 896 GPRS Radio Resource Management