Bandwidth Allocation in Mixed GPRS EDGE Systems
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Solution Overview
Problem
Current methods for allocating available bandwidth in GSM or GSM-R systems face challenges when mixing GPRS and EDGE mobile stations, as they struggle with differing bit rates, leading to inefficient bandwidth utilization and physical limitations, especially when sharing timeslots.
Innovation Solution
A method that calculates an expansion factor to allocate available bandwidth among GPRS and EDGE mobile stations, ensuring efficient use without exceeding physical limitations, by using the formula E = NbTSinCGroup * (pfcTSGBR GPRS + pfcTSGBR EDGE) and allocating bandwidths accordingly, A GPRS = E * D GPRS and A EDGE = E * D EDGE, which also supports mixed traffic classes and priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If GPRS and EDGE mobile stations share the same timeslot group, then bandwidth utilization improves, but physical limitations are exceeded and bandwidth allocation becomes inefficient
Solution Approach 1:
The patent applies parameter changes by introducing an expansion factor E that dynamically adjusts the guaranteed bit rates for GPRS and EDGE mobile stations. Instead of using fixed bit rates (8 kbit/s for GPRS, 20 kbit/s for EDGE), the system multiplies these base rates by expansion factors EGPRS and EEDGE respectively, allowing the parameters to be adjusted based on available bandwidth and demand conditions while maintaining the proportional relationship between different mobile station types.
Solution Approach 2:
The patent implements dynamics by making the bandwidth allocation adaptive rather than static. The expansion factors EGPRS and EEDGE are calculated dynamically based on the ratio of available bandwidth to total bandwidth demand, allowing the system to respond to changing traffic conditions, available resources, and mixed GPRS/EDGE station compositions in real-time, thereby optimizing bandwidth utilization without exceeding physical limitations.
2Ease of manufacture
If fixed guaranteed bit rates are used for GPRS and EDGE, then allocation simplicity is maintained, but bandwidth efficiency decreases and unused bandwidth is lost
Solution Approach 1:
The patent transforms fixed bit rate parameters into dynamic parameters by introducing expansion factors. The guaranteed bit rate for each mobile station type becomes a variable rather than a constant, allowing the system to adjust allocation efficiency while maintaining the simple structure of proportional allocation based on demand ratios.
Solution Approach 2:
The patent creates a universal bandwidth allocation formula that works for both GPRS and EDGE mobile stations regardless of their specific bit rate requirements. The expansion factor mechanism provides a multi-functional solution that handles mixed GPRS/EDGE groups, pure GPRS groups, and pure EDGE groups uniformly, eliminating the need for separate allocation procedures while improving overall bandwidth efficiency.
3Device complexity
If bandwidth allocation ignores mixed GPRS/EDGE scenarios, then calculation complexity is reduced, but allocation accuracy deteriorates and demands cannot be met
Solution Approach 1:
The patent addresses mixed GPRS/EDGE scenarios by introducing type-specific expansion factors EGPRS and EEDGE that adjust the base guaranteed bit rates. This parameter change allows the system to accurately calculate allocations for mixed groups while maintaining a relatively simple calculation structure based on proportional distribution of available bandwidth according to demand ratios.
Data Source
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AI summary
The present invention relates to a method of allocating available bandwidth (A) for packet switched data transmissions in a GSM or GSM-R system (1) having a PFC service module for handling bandwidth demands (D) from mobile stations (2, 3), a group of which shares at least one TDMA timeslot (16) and contains at least one GPRS (2) and at least one EDGE mobile station (3), with: - calculating an expansion factor E according to E=NbTSinCGroupDGPRSpfcTSGBRGPRS+DEDGEpfcTSGBREDGE and - allocating available bandwidths (A) to the at least one GPRS and the at least one EDGE mobile station (2, 3) according to AGPRS=E⋅DGPRS AEDGE=E⋅DEDGE.