Sidelink PSFCH Transmission with LBT Gap Scheduling
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Solution Overview
Problem
Existing sidelink communication systems face challenges in efficiently transmitting and receiving signals in unlicensed bands without significant modifications, particularly due to regulatory requirements for channel access and bandwidth limitations.
Innovation Solution
The method involves using listen-before-talk (LBT) procedures during a configured gap (LBT gap) within the transmission-reception switching period, allowing for efficient sidelink signal transmission and reception in unlicensed bands by incorporating automatic gain control (AGC) and transmission-reception switching periods, minimizing changes to existing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk (LBT) procedures are implemented in sidelink communication, then channel access compliance in unlicensed bands is improved, but transmission delay and complexity increase
Solution Approach 1:
The patent applies preliminary action by performing LBT procedures in advance during the TX-RX switching period before actual data transmission begins. The LBT gap is configured to occur before the PSFCH transmission, allowing the channel to be sensed and cleared beforehand, ensuring compliance while preparing for immediate transmission once the channel is free.
Solution Approach 2:
The patent segments the transmission timeline into distinct phases: a TX-RX switching period containing the LBT gap, followed by the actual data transmission period. This segmentation allows LBT to be performed in a dedicated time window separate from data transmission, reducing interference and organizing the channel access procedure into manageable segments.
2Reliability
If LBT gap is inserted in transmission schedule, then channel access reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent makes the LBT gap duration dynamic by configuring it based on the specific requirements of the TX-RX switching period and the type of LBT being performed. The gap length can be adjusted to match the minimum required sensing time while minimizing the impact on overall transmission efficiency, rather than using a fixed conservative value.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the LBT gap is tightly integrated with the transmission schedule, allowing data transmission to begin immediately after the LBT gap without unnecessary idle periods. The TX-RX switching period is configured to minimize interruptions while ensuring proper channel access procedures are completed.
3Productivity
If TX-RX switching period is configured to include LBT gap, then spectral efficiency in unlicensed bands is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the TX-RX switching period structure to serve multiple functions simultaneously: it provides the necessary LBT gap for channel access compliance, enables proper switching between transmission and reception modes, and optimizes spectral efficiency for unlicensed band operation. This multi-functional design reduces the need for separate dedicated structures for each function.
Solution Approach 2:
The patent utilizes parameter changes by allowing the LBT gap duration and TX-RX switching period parameters to be configured based on the specific LBT type and communication requirements. These parameters can be adjusted to balance spectral efficiency gains against device complexity constraints, enabling flexible optimization for different deployment scenarios.
Data Source
AI summary
The present disclosure provides a method of transmitting a physical sidelink feedback channel (PSFCH) by a terminal in a wireless communication system. In particular, the method may comprise: receiving a physical sidelink control channel (PSCCH); receiving a first physical sidelink shared channel (PSSCH) on the basis of the PSCCH; performing listen before talk (LBT) for an LBT gap; and transmitting a PSFCH corresponding to the first PSSCH on the basis that the LBT has been successful, wherein the LBT gap is positioned immediately before the foremost symbol among symbols for the PSFCH, and transmission of a second PSSCH may continue to the LBT gap from a symbol immediately after the last symbol among symbols for the second PSSCH having been transmitted by the terminal before the PSFCH.