DMRS Time Domain Pattern Configuration for Type-B PDSCH
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in efficiently configuring time domain resource patterns for demodulation reference signals (DMRS) in Type-B PDSCH, leading to excessive receiver complexity and processing resources due to unsupported durations and DMRS gaps, which affect spectral efficiency and latency.
Innovation Solution
The method involves determining a time domain resource pattern for DMRSs in Type-B PDSCH based on existing uplink or downlink time domain patterns, applying interpolation-reduction or extrapolation-reduction rules, and shifting patterns to minimize interpolation and extrapolation, ensuring DMRS gaps are less than or equal to 8 symbols and reducing the quantity of symbols for extrapolation, thereby reusing channel estimation matrices and maintaining a frontloaded DMRS configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing uplink or downlink time domain patterns are reused for Type-B PDSCH DMRS configuration, then device complexity is reduced and ease of manufacture is improved, but the patent must support unsupported durations and DMRS gaps which increases receiver complexity
Solution Approach 1:
The patent applies parameter changes by modifying the time domain resource pattern parameters (DMRS gaps, durations, symbol positions) to satisfy specific criteria (DMRS gaps ≤ 8 symbols, reduced extrapolation symbols) while maintaining the overall structure of existing patterns. This allows reuse of established patterns with adjusted parameters that reduce receiver complexity and processing requirements.
Solution Approach 2:
The patent segments the time domain resource pattern into controllable components (DMRS positions, gap intervals, symbol allocations) that can be independently adjusted. By dividing the pattern into manageable segments, the system can apply interpolation-reduction or extrapolation-reduction rules to specific portions without redesigning the entire pattern, thereby reducing receiver complexity while maintaining ease of configuration.
2Productivity
If DMRS gaps are reduced to less than or equal to 8 symbols, then spectral efficiency is improved and latency is reduced, but the quantity of symbols for extrapolation must be reduced which increases processing constraints
Solution Approach 1:
The patent changes the DMRS gap parameter from existing values to specifically reduced values (≤ 8 symbols), which directly improves spectral efficiency and reduces latency. Simultaneously, the patent reduces the quantity of symbols for extrapolation by applying extrapolation-reduction rules, which manages processing constraints through parameter optimization rather than increasing complexity.
3Device complexity
If interpolation-reduction or extrapolation-reduction rules are applied, then receiver complexity is reduced and memory utilization is improved, but the time domain resource pattern must be shifted which increases configuration complexity
Solution Approach 1:
The patent applies preliminary action by pre-defining interpolation-reduction and extrapolation-reduction rules that determine how time domain resource patterns should be shifted. These rules are established in advance to minimize receiver complexity and improve memory utilization, allowing the system to automatically adjust patterns without requiring complex real-time configuration decisions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station and/or a user equipment may determine a time domain resource pattern for a set of demodulation reference signals (DMRSs), wherein the set of DMRSs is included in a Type-B physical downlink shared channel (PDSCH). A base station may transmit, and the user equipment may receive, the set of DMRSs using a set of resources determined based at least in part on the time domain resource pattern. Numerous other aspects are provided.