Cross-Subband Power Reservation for Mid-Slot UE Interference
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Solution Overview
Problem
In wireless communication systems, especially those using shared spectrum, user equipment (UE) face challenges in determining suitable receive power when a neighboring UE begins transmitting partway through a slot in another subband, leading to potential interference and insufficient receive power for the recipient UE.
Innovation Solution
A neighboring UE transmits a power reservation signal at the beginning of the slot in the recipient UE's subband to indicate its intended transmission power, allowing the recipient UE to adjust its automatic gain control and account for mid-slot transmissions, thereby ensuring adequate receive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits partway through a slot in one subband, then the UE can utilize available spectrum resources dynamically, but the recipient UE cannot determine appropriate receive power due to interference from mid-slot transmissions in other subbands
Solution Approach 1:
The patent applies preliminary action by transmitting a power reservation signal at the beginning of a slot in a first subband before the actual mid-slot transmission occurs in a second subband. This advance signaling allows the recipient UE to prepare appropriate receive power settings and perform automatic gain control procedures before the interfering transmission begins, thus resolving the contradiction between dynamic spectrum utilization and reliable receive power determination
Solution Approach 2:
The power reservation signal acts as an intermediary between the transmitting UE and the recipient UE. Instead of the recipient UE directly dealing with the interference from mid-slot transmissions, the power reservation signal provides advance information about the intended transmission power, enabling the recipient UE to compensate for the upcoming interference and maintain reliable reception
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, from a second UE, a control message that indicates a duration of time the second UE has reserved at least a first subchannel of a first subband of a set of shared spectrum subbands. The duration of time may include a quantity of time periods. The first UE may transmit, during a time period of the quantity of time periods and in a second subchannel of the first subband, a power reservation signal that indicates a transmission power associated with the first UE beginning transmission to a third UE in a second subband of the set of shared spectrum subbands and partway through the time period. The first UE may transmit signaling to the third UE in the second subband partway through the time period and after transmitting the power reservation signal.