Communication Terminal Apparatus Time Slot Allocation for Interference Reduction
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Solution Overview
Problem
The challenge in communication terminal apparatuses that share both terrestrial and satellite systems is to enhance spectral efficiency in the downlink of the terrestrial system while minimizing interference between the two systems through simple radio resource switching control.
Innovation Solution
The apparatus employs memory to store allocation information for non-overlapping time slots in the same frequency band between terrestrial and satellite systems, using all time slots allocated to the terrestrial system and at least some allocated to the satellite system in the downlink, and none in the uplink, based on this information, to optimize radio resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If simple switching control of radio resources is used to avoid interference between terrestrial and satellite systems, then interference between systems is reduced, but spectral efficiency in the downlink of the terrestrial system is limited
Solution Approach 1:
The radio resources are segmented into different time slots for terrestrial and satellite systems. The terrestrial system uses time slots TS1-TS4 while the satellite system uses TS5-TS8, creating clear temporal separation that avoids interference while allowing both systems to operate simultaneously without conflicting with each other's transmissions.
Solution Approach 2:
The patent implements dynamic time slot allocation where the terrestrial base station can flexibly assign different time slots to different user terminals based on their locations and requirements. For example, terminals in terrestrial coverage areas use TS1-TS4, while terminals in satellite coverage areas use TS5-TS8, optimizing spectral efficiency while maintaining interference avoidance.
2Productivity
If all time slots are used in downlink for terrestrial system, then spectral efficiency is improved, but interference with satellite system may occur
Solution Approach 1:
The patent employs periodic time slot allocation where terrestrial downlink transmissions occur in TS1-TS4 and satellite downlink transmissions occur in TS5-TS8 in a repeating cycle. This periodic structure ensures that terrestrial base stations can use all available time slots for downlink transmissions without causing interference to satellite systems, as the satellite system operates in its designated time slots during each period.
3Device complexity
If time slot switching control is used instead of frequency switching, then control complexity is reduced, but flexibility in resource allocation may be limited
Solution Approach 1:
The patent implements dynamic time slot allocation where the terrestrial base station can flexibly assign different time slots to different user terminals based on their locations and requirements. For example, terminals in terrestrial coverage areas use TS1-TS4, while terminals in satellite coverage areas use TS5-TS8, optimizing spectral efficiency while maintaining interference avoidance.
Solution Approach 2:
The patent changes the time slot parameter dynamically based on terminal location and system conditions. The base station adjusts which time slots are allocated to which terminals, changing the temporal parameter of resource allocation to optimize performance while maintaining simple switching control without requiring complex frequency changes.
Data Source
AI summary
A communication terminal apparatus, a terrestrial cellular base station and a mobile communication system are provided, which are capable of being shared in a terrestrial cellular mobile communication system and a satellite mobile communication system, preventing an interference between both systems and improving a spectral efficiency in a downlink of the terrestrial cellular mobile communication system, by simple switching control of radio resources. When the communication terminal apparatus is located in an area of the terrestrial cellular mobile communication system, all of time slots allocated to the terrestrial cellular mobile communication system and at least a part of time slots allocated to the satellite mobile communication system are used in a downlink, and all of time slots allocated to the terrestrial cellular mobile communication system are used and time slots allocated to the satellite mobile communication system are not used in an uplink.