Sidelink DMRS Pattern Selection via SCI for Channel Duration
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Solution Overview
Problem
The NR system lacks clear guidelines for determining and indicating DMRS patterns for sidelink channels, which affects data transmission efficiency in scenarios like V2V and V2X communications.
Innovation Solution
A method for determining and indicating an additional DMRS symbol number through SCI, allowing the receiving terminal device to calculate the sidelink data channel duration and select an appropriate DMRS pattern based on the received symbol number and duration, while the transmitting terminal device determines the duration and symbol number and transmits SCI to indicate the same.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS patterns are pre-configured for sidelink data channel, then channel estimation can be performed, but the NR system lacks clear guidelines for the number of patterns, determination method, and indication method
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the DMRS pattern based on the duration of the sidelink data channel. The system changes the DMRS pattern parameter according to the channel duration, which is indicated through SCI signaling. This resolves the contradiction by providing clear parameter selection guidelines while maintaining flexibility for different channel conditions.
Solution Approach 2:
The patent implements dynamics by making the DMRS pattern selection dynamic rather than static. The transmitting terminal determines the channel duration and selects an appropriate DMRS pattern from pre-configured options, then indicates this selection to the receiving terminal through SCI. This dynamic approach provides clear determination and indication methods while adapting to varying channel conditions.
2Adaptability or versatility
If multiple DMRS patterns are supported for different sidelink scenarios, then communication flexibility improves, but the system lacks standardized methods for determining and indicating patterns
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple DMRS patterns in advance for different sidelink scenarios. The system prepares a set of standardized patterns before actual communication, each suitable for specific channel duration conditions. This allows the transmitting terminal to simply select from pre-prepared options based on the current channel duration, making operation easy while maintaining high adaptability.
Solution Approach 2:
The patent uses parameter changes to map different channel duration parameters to specific DMRS patterns. By establishing clear relationships between channel duration and pattern selection, the system provides standardized determination and indication methods. This resolves the contradiction by making pattern selection straightforward through parameter-based rules while supporting multiple scenarios.
Data Source
AI summary
Communication methods, devices and a computer readable medium in the wireless communication system. A communication method is performed at a receiving terminal device in the sidelink communication. In the communication method, sidelink control information (SCI) is received from a transmitting terminal device, the SCI indicating an additional DMRS symbol number for the sidelink data channel. Then, duration of the sidelink data channel is determined according to the number of symbols within a slot and the number of symbols for a sidelink feedback channel. Next, a DMRS pattern to be used for the sidelink data channel is determined based on the received additional DMRS symbol number for the sidelink data channel and the determined duration of the sidelink data channel.