NR Sidelink Power Control for LTE Co-Channel Overlap
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Solution Overview
Problem
Efficient signal transmission is challenged in wireless communication systems where NR sidelink and LTE sidelink communications coexist on a co-channel, leading to interference and instability in channel configurations.
Innovation Solution
A terminal configured for NR sidelink communication adjusts its transmission power and subcarrier spacing to minimize interference with legacy LTE terminals by using a larger subcarrier spacing and controlling transmission power across multiple slots, ensuring stable communication for control and shared channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NR sidelink and LTE sidelink communications coexist on a co-channel, then communication capacity is improved, but interference between systems increases
Solution Approach 1:
The patent applies local quality by configuring different subcarrier spacings for different time slots specifically when NR sidelink transmissions overlap with LTE subframes. The first subcarrier spacing is used in slots overlapping with LTE subframes to avoid interference, while a second subcarrier spacing is used in non-overlapping slots for normal NR operation. This localized parameter adjustment resolves the interference issue without affecting overall system capacity.
2Object-affected harmful factors
If NR sidelink uses larger subcarrier spacing to avoid LTE interference, then interference is reduced, but transmission efficiency may be affected
Solution Approach 1:
The patent implements periodic action by alternating between different subcarrier spacings based on the timing relationship with LTE subframes. The first subcarrier spacing is periodically applied in slots that overlap with LTE subframes, while the second subcarrier spacing is used in slots without overlap. This periodic switching ensures interference avoidance during critical periods while maintaining transmission efficiency during non-critical periods.
3Reliability
If transmission power is controlled across multiple slots, then communication stability is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the first subcarrier spacing in slots that are predetermined to overlap with LTE subframes. The terminal receives configuration information indicating the first subcarrier spacing for multiple slots in advance, allowing it to proactively adjust parameters before interference occurs. This preliminary configuration simplifies the control mechanism while ensuring communication stability during overlapping periods.
Data Source
AI summary
Disclosed is a method by which a terminal transmits a signal in a wireless communication system. The terminal can receive configuration information for setting a first subcarrier spacing (SCS) for a plurality of slots, and transmit a physical sidelink shared channel (PSSCH) in the plurality of slots. At this time, if the terminal coexists with a legacy terminal in a co-channel and the plurality of slots fully overlap a legacy subframe of the legacy terminal, second transmission power in at least one slot that excludes a first slot from among the plurality of slots can be limited by means of first transmission power of the first slot.