Dynamic sPDCCH Resource Allocation for Latency Reduction
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Solution Overview
Problem
Current LTE systems face challenges in reducing packet data latency, particularly due to limitations in the efficiency of short Physical Downlink Control Channel (sPDCCH) resource allocation, which affects the scheduling and transmission speed, leading to increased reference signal overhead and reduced resource utilization.
Innovation Solution
The method involves dynamically determining and modifying sPDCCH resources based on characteristics such as reference signal overhead, subslot length, and transmission mode, allowing for flexible allocation of time and frequency resources to optimize sPDCCH transmission, including using a different number of OFDM symbols and PRBs depending on the sTTI pattern and reference signal overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sPDCCH resources are allocated using fixed LTE subframe structure, then system compatibility is maintained, but packet data latency cannot be reduced effectively
Solution Approach 1:
The patent applies dynamics by making sPDCCH resource allocation flexible and adaptive rather than fixed. The network node dynamically determines time resources (number of OFDM symbols) and frequency resources (PRBs) for sPDCCH based on current transmission conditions, sTTI patterns, and reference signal overhead, enabling the system to adapt to varying latency requirements while maintaining LTE compatibility.
Solution Approach 2:
The patent changes key parameters of sPDCCH allocation including the number of OFDM symbols (time resources), number of resource blocks (frequency resources), and aggregation levels. These parameter changes allow the system to optimize latency performance by adjusting resource allocation according to specific transmission scenarios, sTTI configurations, and reference signal overhead conditions.
2Reliability
If sPDCCH uses more time resources (OFDM symbols) to ensure reliable transmission, then decoding reliability improves, but reference signal overhead increases
Solution Approach 1:
The patent optimizes the number of OFDM symbols allocated to sPDCCH based on reference signal overhead conditions. When reference signal overhead is high, the system adjusts the time resource allocation to maintain adequate signal-to-noise ratio and decoding reliability. This dynamic parameter adjustment ensures reliable transmission while minimizing unnecessary reference signal overhead.
Solution Approach 2:
The patent applies partial action by allocating just enough time resources (OFDM symbols) for sPDCCH to achieve reliable decoding without excessive allocation. The system determines the minimum necessary resources based on transmission conditions, avoiding waste of reference signal overhead while maintaining adequate reliability for successful decoding.
3Reliability
If sPDCCH aggregation level is increased to improve decoding reliability, then transmission robustness improves, but resource efficiency deteriorates
Solution Approach 1:
The patent makes aggregation level selection dynamic by adapting it to transmission conditions, wireless device capabilities, and channel quality. The network node selects appropriate aggregation levels (1, 2, 4, or 8) based on current conditions, using higher aggregation levels only when necessary for reliability-critical transmissions and lower levels for efficient resource utilization in good channel conditions.
Solution Approach 2:
The patent changes aggregation level parameters dynamically to balance reliability and resource efficiency. By adjusting the aggregation level according to transmission requirements and channel conditions, the system achieves robust transmission when needed while maintaining high resource efficiency during normal operations, avoiding excessive resource consumption.
4Productivity
If sPDCCH resource allocation is made dynamic based on transmission characteristics, then resource efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the network node monitors transmission conditions, sTTI patterns, and decoding success rates to continuously optimize sPDCCH resource allocation. This feedback-driven approach enables dynamic resource efficiency improvements while keeping complexity manageable through rule-based decision making rather than complex algorithms.
Solution Approach 2:
The patent manages complexity by changing a limited set of well-defined parameters (number of OFDM symbols, number of PRBs, aggregation levels) based on transmission characteristics. This parameter-based approach provides sufficient resource efficiency improvement while avoiding excessive system complexity through standardized adjustment mechanisms.
Data Source
AI summary
A network node for configuring resources for a short Physical Downlink Control Channel, sPDCCH, is provided. The network node includes processing circuitry configured to determine time resources for the sPDCCH based on at least one characteristic associated with transmission, and configure a wireless device using the time resources for the sPDCCH.