Radio Resource Allocation for Elastic Sessions in CDMA Networks
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Solution Overview
Problem
In mobile radio communication networks operating with code division multiple access (CDMA), the limited radio bandwidth leads to inefficient resource utilization, as the maximum transmission capacity is tightly coupled with interference levels, necessitating a method to optimize resource allocation among ongoing sessions.
Innovation Solution
A method is introduced to allocate reduced radio resources to elastic sessions by slowing down their transmission rates based on the requirements of other ongoing sessions, ensuring that the resource share is not lower than the maximum transmission rate when sufficient resources are available, thereby optimizing resource utilization without compromising real-time transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power is reduced to lower interference, then network capacity increases, but transmission rate decreases
Solution Approach 1:
The patent applies dynamic transmission rate control by adjusting the transmission rate of elastic sessions based on current network conditions and interference levels. The system continuously monitors the radio situation and adapts transmission rates in real-time, allowing the network to optimize capacity while maintaining acceptable service quality. This dynamic adjustment resolves the contradiction by making transmission rate a variable parameter rather than a fixed value.
Solution Approach 2:
The patent changes the transmission rate parameter of elastic sessions to optimize network capacity. By modifying this key parameter based on network load and interference conditions, the system can increase overall capacity during high-load periods while maintaining service functionality. The parameter change is applied selectively to elastic sessions rather than all sessions, preserving quality for time-sensitive traffic.
2Quantity of substance
If transmission rate is reduced to increase network capacity, then more sessions can be supported, but holding time increases
Solution Approach 1:
The patent applies local quality by differentiating between elastic sessions and time-sensitive sessions in its resource allocation strategy. Elastic sessions (such as file transfers and email) are subjected to transmission rate reduction to increase overall session capacity, while time-sensitive sessions (such as voice calls and interactive applications) maintain their transmission rates to preserve service quality. This selective application resolves the contradiction by applying rate control only where it does not critically impact holding time requirements.
3Reliability
If radio resources are allocated to maintain peak transmission rate, then service quality is preserved, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies partial action by implementing transmission rate control only for elastic sessions rather than all sessions. Time-sensitive sessions receive full resource allocation to maintain service quality, while elastic sessions undergo rate reduction. This partial application of rate control achieves improved resource utilization efficiency without compromising the service quality of critical applications, resolving the contradiction between reliability and productivity.
Data Source
AI summary
A method and apparatus for allocating radio resources to an elastic session in a cell in a CDMA network is presented. The method comprises allocating, to the elastic session, a radio resource share corresponding to a reduced transmission rate wherein the reduction in transmission rate corresponds to a peak transmission rate of the elastic session being slowed down by a first slowdown rate. The first slow down rate is determined in dependency of the transmission rate requirements of the ongoing sessions in the cell in a manner so that the radio resource share allocated is not lower than a radio resource share corresponding to the maximum transmission rate if a total amount of resources available for allocation to ongoing sessions in the cell is sufficient for all ongoing sessions to transmit at a respective peak transmission rate.