OFDMA Soft Handoff Resource Management via Logical-Physical Mapping
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Solution Overview
Problem
In OFDMA-based communication systems, mobile stations at the edge of sectors experience poor data throughput due to strong co-channel interference and inefficient use of common radio resources, leading to decreased system throughput and user experience.
Innovation Solution
The method involves separating logical radio resources into sets for soft handoff groups and normal communication traffic, using a predetermined mapping function to identify and allocate physical radio resources, and modifying the hopping pattern to minimize resource collisions and interference, while broadcasting resource assignments to mobile stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If common radio resources are used for soft handoff in OFDMA systems, then mobile stations at sector edges can improve data throughput, but strong co-channel interference is generated especially at cell borders
Solution Approach 1:
The patent segments the radio resources by separating logical resources into two distinct sets: a first set dedicated to soft handoff transmissions and a second set for normal communications. This segmentation prevents interference between soft handoff signals and normal traffic, allowing mobile stations at sector edges to benefit from soft handoff without generating harmful co-channel interference that would degrade system performance.
2Productivity
If logical radio resources are separated into sets for soft handoff and normal traffic, then resource allocation efficiency improves, but device complexity increases due to mapping functions and resource management
Solution Approach 1:
The patent introduces a mapping function as an intermediary mechanism that translates logical resource assignments into physical resource allocations. This mapping function serves as a mediator between the resource separation strategy and the actual physical transmission, enabling efficient resource allocation while managing complexity through a systematic translation process rather than direct complex management.
3Object-generated harmful factors
If sub-carrier hopping pattern is modified to minimize resource collisions, then interference reduction is achieved, but signaling overhead increases for broadcasting resource assignments
Solution Approach 1:
The patent applies preliminary action by pre-defining the mapping function and resource assignment rules before actual communication occurs. The logical resource sets are established in advance, and the mapping function is predetermined, allowing the system to minimize interference through structured resource allocation without requiring excessive real-time signaling. Resource assignments are broadcast efficiently based on these pre-established frameworks.
Data Source
AI summary
A method and system is disclosed for managing resource within a predetermined soft handoff group in an OFDM based telecommunications system. Logical radio resources are separated into at least one set to support the soft handoff group and at least one set for supporting normal communication traffic. At least one physical radio resource is identified for each logical radio resource in the set for supporting the SHOG according to a predetermined mapping function so as to minimize resource collision.