LTE Base Station SPS Conflict Resolution
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Solution Overview
Problem
In LTE and LTE-Advanced systems, simultaneous Semi-Persistent Scheduling (SPS) communications at different intervals can lead to conflicts, where only one data transmission is allowed per subframe, potentially causing one SPS communication to be terminated when multiple SPS communications occur at the same timing, even with conventional control methods.
Innovation Solution
A radio communication system with a base station and mobile station that adjusts communication configurations to resolve simultaneous SPS communications by shifting communication timings and using methods like spatial multiplexing or bundling data into a single transport block to avoid conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SPS communications are scheduled at the same timing, then communication capacity is utilized, but transmission conflicts occur and one SPS communication must be terminated
Solution Approach 1:
The base station performs preliminary scheduling to identify and detect when multiple SPS communications are scheduled at the same timing before actual transmission occurs. This advance detection allows the system to preemptively resolve conflicts by switching to DS or adjusting timing, preventing transmission conflicts and ensuring continuous SPS communications without data loss.
Solution Approach 2:
The system dynamically switches between SPS and DS modes based on real-time scheduling conditions. When multiple SPS communications are detected at the same timing, the system automatically transitions to DS for those specific communications while maintaining SPS for others, allowing flexible adaptation to avoid conflicts while maximizing communication capacity utilization.
2Loss of information
If SPS communication is used to reduce PDCCH signaling overhead, then signaling efficiency is improved, but simultaneous SPS communications cause transmission conflicts
Solution Approach 1:
The base station continuously monitors the scheduling status of SPS communications and provides feedback when conflicts are detected. When multiple SPS communications are scheduled at the same timing, the system receives feedback about the conflict and automatically adjusts by switching to DS or modifying timing, thereby maintaining low signaling overhead while preventing transmission conflicts.
3Reliability
If DS is used instead of SPS to avoid simultaneous transmission conflicts, then transmission reliability is improved, but PDCCH signaling overhead increases
Solution Approach 1:
The system dynamically selects between SPS and DS modes based on scheduling conditions. SPS is used as the default mode to minimize signaling overhead, but the system automatically switches to DS when conflicts are detected, and can switch back to SPS when conflicts are resolved. This dynamic approach ensures transmission reliability while minimizing PDCCH signaling overhead.
Data Source
AI summary
A radio communication system includes a base station and a mobile station. The base station includes a controller that changes communication configurations when a plurality of communications with the mobile station at respective periodic communication intervals are scheduled to occur at the same communication timing so as to control to resolve simultaneous communications. The mobile station comprises a controller that performs communications with the base station using the communication configurations changed by the controller in the base station.