Semi-Persistent Scheduling for Multicarrier Adaptability
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation, particularly in dynamic modulation and coding schemes, and resource allocation across multiple carriers, leading to suboptimal performance in varying radio conditions.
Innovation Solution
The implementation of advanced physical layer mechanisms, including OFDM technology, dynamic modulation schemes like QAM, and semi-dynamic adjustment of transmission parameters based on real-time radio conditions, along with enhanced resource allocation strategies, enables efficient operation of carrier aggregation in multicarrier systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic modulation schemes and semi-dynamic adjustment of transmission parameters are implemented, then adaptability to radio conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements semi-dynamic adjustment of transmission parameters where the wireless device determines a second set of transmission parameters for retransmitting data based on updated channel conditions. This dynamic adaptation allows the system to adjust modulation and coding schemes between initial transmission and retransmission, improving reliability under varying radio conditions while managing complexity through controlled semi-dynamic changes rather than fully dynamic adjustments.
Solution Approach 2:
The patent changes physical layer transmission parameters (modulation scheme, coding rate, resource allocation) based on channel quality indicators and hybrid ARQ feedback. The wireless device selects from multiple predefined parameter sets corresponding to different channel conditions, enabling adaptability without requiring complex real-time optimization algorithms, thus balancing performance improvement with acceptable device complexity.
2Reliability
If hybrid ARQ protocols are implemented across multiple carriers, then reliability is improved, but processing time increases
Solution Approach 1:
The patent segments the hybrid ARQ process into parallel operations across multiple component carriers. Each carrier maintains independent HARQ processes with separate buffers and feedback mechanisms, allowing simultaneous processing of multiple data transmissions. This segmentation enables the system to achieve high reliability through redundant transmissions while minimizing processing time by utilizing parallel carrier resources rather than sequential processing.
Solution Approach 2:
The patent implements preliminary configuration of transmission parameters and resource allocation before actual data transmission. The network pre-configures multiple parameter sets and resource allocations that can be quickly activated based on channel conditions, reducing the time required for parameter negotiation and decision-making during retransmission events, thus maintaining high reliability while minimizing processing delays.
3Productivity
If carrier aggregation with multiple component carriers is implemented, then throughput is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements a unified resource allocation mechanism that manages multiple component carriers through a single set of control procedures. The same physical layer protocols, modulation schemes, and coding strategies are applied across all component carriers, allowing the system to achieve high throughput through carrier aggregation while reducing allocation complexity by using universal management procedures rather than carrier-specific configurations.
Solution Approach 2:
The patent employs periodic channel quality reporting and semi-persistent scheduling across component carriers. Instead of continuous dynamic resource allocation, the system uses periodic feedback mechanisms and pre-configured resource allocations that are activated based on channel conditions, reducing the complexity of real-time resource management while maintaining high throughput through efficient periodic resource utilization across aggregated carriers.
Data Source
AI summary
A wireless device receives at least one message. The at least one message comprises an uplink semi persistent scheduling (SPS) radio network temporary identifier (RNTI), and a sequence of at least one uplink SPS information element (IE). An uplink SPS IE of the sequence comprises: at least one uplink SPS configuration parameter comprising an uplink SPS interval, and an SPS configuration index for the at least one uplink SPS configuration parameter. A downlink control information (DCI) corresponding to the uplink SPS RNTI may be received. The DCI comprises a first SPS configuration index of one of the at least one uplink SPS IE. At least one transport block may be transmitted employing at least one first uplink SPS configuration parameter corresponding to the first SPS configuration index.