Quasi-Dedicated Control Channel for Wireless Resource Allocation
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Solution Overview
Problem
The IEEE 802.16e communication system experiences resource waste due to inefficient UL resource allocation, particularly for CQICH and rtPS services, leading to deterioration of system performance due to mobility differences among mobile stations and inefficient use of both UL and DL resources.
Innovation Solution
The system introduces a quasi-dedicated control channel (QDCCH) that can be temporarily allocated to other mobile stations, optimizing resource usage by differentiating CQI feedback periods and allocating UL resources based on service characteristics, thereby minimizing resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated CQICH resources are allocated to all mobile stations at fixed periods, then channel quality feedback can be obtained, but UL resource waste occurs due to mobility differences among mobile stations
Solution Approach 1:
The patent introduces a quasi-dedicated control channel (QDCCH) that can serve multiple mobile stations dynamically. Instead of dedicating CQICH resources to each mobile station permanently, the QDCCH is allocated to different mobile stations based on their current service requirements and mobility states, allowing one channel to perform multiple functions for different users at different times.
Solution Approach 2:
The patent implements dynamic allocation of QDCCH resources where the base station adjusts channel allocation based on real-time mobile station mobility and service requirements. Mobile stations with low mobility can have their QDCCH temporarily allocated to other stations, while high-mobility stations retain dedicated resources, creating a flexible and adaptive resource allocation system.
2Reliability
If UL dedicated resources are allocated for rtPS service, then periodic data transmission is supported, but resource waste occurs when data is not transmitted during allocated periods
Solution Approach 1:
The QDCCH is designed to serve both CQI feedback and periodic service data transmission needs. When a mobile station's QDCCH is not needed for CQI feedback, it can be temporarily reallocated to carry data for other mobile stations providing periodic services, making the channel versatile and reducing overall resource waste.
Solution Approach 2:
The system allows mobile stations to autonomously determine whether they have data to transmit during their allocated QDCCH periods. If no data is present, the channel is automatically made available for other uses without requiring manual intervention or polling, enabling efficient resource reallocation.
3Reliability
If polling is performed for UL resource allocation information, then service quality is maintained, but DL resource waste occurs due to unnecessary polling
Solution Approach 1:
Mobile stations autonomously monitor their QDCCH allocation status and determine whether to transmit data without requiring the base station to poll them. This self-service mechanism eliminates unnecessary polling overhead and allows mobile stations to independently manage their resource usage.
Solution Approach 2:
The system implements feedback mechanisms where mobile stations inform the base station about their data transmission status and QDCCH usage. This feedback allows the base station to make informed decisions about channel reallocation without needing to perform exhaustive polling, reducing DL resource consumption while maintaining service quality.
Data Source
AI summary
Provided is an apparatus and method for transmitting/receiving signals in a communication system. A base station allocates a quasi-dedicated control channel (QDCCH) to a first mobile station (MS), and allocates the QDCCH allocated to the first MS, to a second MS for a preset time. An MS receives a QDCCH allocated from the base station. If there is data to transmit to the base station, the MS determines whether the QDCCH is allocated to another MS different from the MS. If it is determined that the QDCCH is allocated to the MS itself, the MS transmits the data to the base station over the QDCCH.