Wireless Resource Preemption for Call Blocking Reduction
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Solution Overview
Problem
In CDMA 1xRTT wireless networks, the variable demand for resources leads to call blocking issues due to reserved minimum resources for data transfers, which can result in insufficient resources for new requests, especially when SCH usage monopolizes data resources, even if other channels have unused resources.
Innovation Solution
Implementing a resource management system that allows high-priority services to preempt resources allocated to low-priority services, enabling adaptive re-allocation of Walsh Code and Forward Power resources between FCH and SCH channels to ensure sufficient resources for incoming high-priority requests, while maintaining a 'head room' for FCH resources to prevent blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved for data transfers to ensure minimum service levels, then reliability of data service is improved, but availability of resources for new requests deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the base station resource manager can adjust resource partitioning between FCH and SCH channels based on real-time network conditions. Instead of fixed reservations, the system dynamically modifies resource allocation to balance guaranteed minimum service levels with adaptability to new requests, allowing the network to respond flexibly to changing traffic patterns while maintaining reliability guarantees.
Solution Approach 2:
The system changes the parameter of resource allocation from static reserved values to dynamic values that can be adjusted based on current network state. The base station resource manager monitors resource usage and modifies the amount of resources reserved for SCH channels versus available for FCH channels, thereby changing allocation parameters to resolve the contradiction between guaranteed service levels and resource availability for new requests.
2Productivity
If SCH resources are fully utilized to maximize data throughput, then productivity is improved, but call blocking for FCH requests increases
Solution Approach 1:
The patent employs dynamic resource management where the base station resource manager continuously monitors SCH channel utilization and FCH request patterns. When FCH request blocking becomes excessive, the system dynamically reduces SCH resource allocation to free up resources for FCH channels. This dynamic adjustment maintains high productivity during normal operation while preventing excessive blocking during peak FCH demand periods.
Solution Approach 2:
The system implements feedback mechanisms where the base station resource manager monitors the blocking rate of FCH requests and uses this information to adjust resource allocation between SCH and FCH channels. When feedback indicates high blocking rates, the manager reallocates resources from SCH to FCH, thereby reducing blocking while maintaining overall system productivity through adaptive response to network conditions.
3Productivity
If variable transfer rates are permitted to maximize resource utilization, then productivity is improved, but call blocking for new requests increases
Solution Approach 1:
The patent implements a dynamic resource management system that adjusts resource allocation based on real-time network conditions and service priorities. The base station resource manager monitors both ongoing data transfers and incoming service requests, dynamically modifying resource allocation to maintain high utilization while ensuring resources remain available for new requests. This dynamic approach allows variable transfer rates during periods of low demand while preventing blocking during periods of high demand.
Data Source
AI summary
The invention provides for the management of wireless resources, which can reduce call blocking by allowing high priority services, under suitable conditions, to use resources allocated to low priority services. Thus high priority services can pre-empt the usage of wireless resources by low priority services. This has the advantage of reducing call blocking for high priority calls, while permitting low priority calls to have more access to radio resources than conventional systems with the same call blocking rate. Thus a base station can implement a preemption mechanism that would reclaim Walsh Code and Forward Power resources from an active Supplemental Channel (SCH) burst in order to accommodate incoming Fundamental Channel (FCH) requests.