SCCE to SREG Mapping for SPDCCH Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in reducing packet data latency, particularly in LTE networks, which affects system responsiveness and throughput, and there is a need for improved scheduling of Short Transmission Time Intervals (STTIs) to enhance radio resource efficiency.
Innovation Solution
The implementation of systems and methods for mapping Short Control Channel Elements (SCCE) to Short Resource Element Groups (SREG) for Short Physical Downlink Control Channel (SPDCCH) transmissions, specifically defining localized and distributed SCCE to SREG mappings for CRS-based and DMRS-based SPDCCH, to optimize latency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If Short Transmission Time Interval (STTI) is implemented to reduce packet data latency, then latency is improved, but control channel mapping complexity increases
Solution Approach 1:
The control channel is segmented into Short Control Channel Elements (SCCEs) that can be independently mapped to Short Resource Element Groups (SREGs). This segmentation allows flexible mapping configurations for different STTI lengths (1, 2, or 3 OFDM symbols) while maintaining manageable complexity through standardized mapping patterns.
Solution Approach 2:
The patent defines SCCE to SREG mapping relationships that change based on the STTI length parameter. For 1 OFDM symbol STTI, the mapping follows one pattern, while 2 or 3 OFDM symbol STTIs use different mapping configurations. This parameter-driven approach allows the system to adapt mapping complexity to the actual latency reduction needs.
2Productivity
If STTI scheduling is optimized to improve radio resource efficiency, then resource efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The scheduling mechanism dynamically selects between localized and distributed SCCE to SREG mapping based on channel conditions and traffic requirements. This dynamic adaptation allows the system to optimize radio resource efficiency without requiring complex static scheduling configurations, as the mapping can be adjusted in response to actual network conditions.
3Adaptability or versatility
If localized and distributed SCCE to SREG mappings are defined for CRS-based and DMRS-based SPDCCH, then mapping flexibility is improved, but system complexity increases
Solution Approach 1:
The patent defines universal SCCE to SREG mapping relationships that work for both CRS-based and DMRS-based SPDCCH, as well as for different STTI lengths. This multi-functionality approach allows a single mapping framework to handle multiple scenarios, improving flexibility while avoiding the need for separate complex mapping mechanisms for each case.
Data Source
AI summary
Short Control Channel Elements (SCCE) to Short Resource Element Groups (SREG) mapping for Short Physical Downlink Control Channel (SPDCCH) is provided. A User Equipment (UE) receives a communication from a base station; determines a mapping between one or more SCCE and corresponding SREG; and processes the communication based on the mapping. A base station determines a mapping between one or more SCCE and corresponding SREG for a communication to a UE and transmits a communication to the UE based on the mapping. In this way, the localized and distributed SCCE to SREG mapping for CRS-based SPDCCH is defined. Also, the SCCE to SREG mapping for 2 and 3 OFDM symbols DMRS-based SPDCCH is defined. For DMRS-based SPDCCH, a distributed configuration at SCCE level is defined. This may improve latency and can improve the average throughput of a communications system. Radio resource efficiency could be positively impacted by latency reductions.