DMRS Pattern for Multi-Channel Semi-Persistent Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in control overhead and resource allocation due to the inclusion of demodulation reference signals (DMRS) in each downlink shared channel (PDSCH) communication, especially in low-mobility scenarios where channel coherence is high, leading to increased power consumption and reduced throughput.
Innovation Solution
A method where a base station transmits an indication of a DMRS pattern for a burst of PDSCH communications, allowing for the omission of DMRS in some or all PDSCH communications within the burst, and providing DMRS separately or dynamically, to reduce control overhead and optimize resource allocation based on channel coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS is included in each PDSCH communication, then channel estimation accuracy is improved, but control overhead and power consumption increase
Solution Approach 1:
The patent extracts DMRS from individual PDSCH communications and consolidates them into shared resources. Specifically, a single DMRS is transmitted for multiple PDSCH communications within a burst, and multiple UEs share the same DMRS resources when their channels are coherent. This extraction eliminates redundant DMRS transmissions while maintaining channel estimation accuracy through channel coherence exploitation.
Solution Approach 2:
The patent merges multiple DMRS transmissions into a single shared DMRS resource. By combining DMRS transmissions across multiple PDSCH communications and multiple UEs, the system reduces total DMRS overhead while maintaining estimation accuracy through channel coherence. The merging is enabled by indicating to UEs that they should share DMRS resources under specific coherence conditions.
2Reliability
If DMRS is included in each PDSCH communication, then demodulation reliability is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent makes DMRS universal by enabling a single DMRS to serve multiple PDSCH communications and multiple UEs simultaneously. The DMRS resource is designed to be multi-functional, providing channel estimation for burst-level PDSCH communications across different UEs when channel coherence conditions are met. This universality improves resource allocation efficiency while maintaining demodulation reliability through the indicated sharing mechanism.
Solution Approach 2:
The patent implements periodic DMRS transmission patterns where DMRS is transmitted only when needed based on channel coherence conditions. The base station indicates to UEs whether to expect shared DMRS in upcoming PDSCH communications, creating a periodic rhythm of DMRS transmission that aligns with channel coherence characteristics rather than transmitting DMRS with every PDSCH.
3Productivity
If DMRS pattern is optimized for low-mobility scenarios, then throughput is improved, but system adaptability to high-mobility scenarios deteriorates
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the DMRS sharing configuration to be adjusted based on channel coherence conditions and mobility scenarios. The base station can dynamically indicate to UEs whether DMRS sharing is applicable in given conditions, enabling the system to adapt between low-mobility scenarios (where sharing is beneficial) and high-mobility scenarios (where individual DMRS may be needed). This dynamic configuration resolves the contradiction between optimization for specific scenarios and general adaptability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a demodulation reference signal (DMRS) pattern for a burst of physical downlink shared channel (PDSCH) communications, wherein the burst of PDSCH communications includes one or more associated PDSCH communications within a period of the burst of PDSCH communications, and wherein the DMRS pattern indicates a pattern of DMRS transmitted in the burst of PDSCH communications. The UE may receive the burst of PDSCH communications based at least in part on the DMRS pattern. Numerous other aspects are described.