Power Level Signaling for LTE and NR CV2X Interference
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Solution Overview
Problem
In wireless communication systems, the interference between LTE CV2X and NR CV2X wireless communications can lead to receiver saturation in LTE CV2X devices, particularly due to the lack of guard bands and differing frequency ranges, resulting in noise and interference that degrade reception quality.
Innovation Solution
The approach involves transmitting a signal with a power level associated with an upcoming NR CV2X communication during a first slot, allowing the LTE CV2X receiving device to set a gain based on this power level, thereby avoiding high gain settings that could cause receiver saturation. This is achieved by duplicating a symbol of the NR CV2X communication and transmitting it during a first slot, ensuring the gain setting reflects the actual power level of the NR CV2X communication during the second slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE CV2X receiving device operates without guard bands and with differing frequency ranges, then spectrum efficiency is improved, but receiver saturation occurs due to interference from NR CV2X communications
Solution Approach 1:
The transmitting device sends a power level indication signal before the actual data transmission. This preliminary action allows the receiving device to configure its gain and receiver parameters in advance, preventing receiver saturation when NR CV2X communications occur without guard bands, thus maintaining both spectrum efficiency and reception quality
2Reliability
If gain setting is increased to compensate for interference, then signal reception is improved, but receiver saturation occurs due to high power level signals
Solution Approach 1:
The transmitting device provides feedback information about the power level of upcoming transmissions to the receiving device. This feedback mechanism enables the receiver to adjust its gain setting dynamically, setting lower gain for high power level signals to avoid saturation while maintaining higher gain for low power level signals to ensure proper reception
3Reliability
If frequency selectivity of receiver components is increased to reduce interference, then reception quality is improved, but device complexity and cost increase
Solution Approach 1:
Instead of increasing frequency selectivity of receiver components, the invention changes the operational parameters of the receiver by dynamically adjusting gain settings based on power level indications from the transmitting device. This approach maintains reception quality while avoiding the increased complexity and cost associated with more selective frequency filtering components
Data Source
AI summary
An apparatus for wireless communication includes a receiver and a transmitter that is configured to transmit a signal during a first slot. The signal has a power level that is associated with a transmission that is to occur during the first slot or during a second slot after the first slot. The signal is distinct from the transmission. The first slot and the second slot occur during a sub-frame time interval associated with a first cellular vehicle-to-everything (CV2X) wireless communication protocol, and the first slot and the second slot are associated with a second CV2X wireless communication protocol different than the first CV2X wireless communication protocol. The transmitter is further configured to perform the transmission during the second slot based on the power level.