Unicast Satellite Location Data for UE Power Reduction
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Solution Overview
Problem
In wireless communications systems, especially in non-terrestrial networks, the large propagation delay and frequency shifts due to high-altitude satellites cause synchronization issues for user equipment (UEs), leading to inefficient satellite location information transmission, where frequent broadcast transmissions waste power and can collide with uplink transmissions.
Innovation Solution
Implementing dedicated unicast transmission of satellite location information, where UEs receive first location information via broadcast and second, more accurate information via unicast, allowing for reduced power consumption and increased reliability by determining uplink timing and frequency based on the unicast data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent broadcast transmissions of satellite location information are used, then all UEs can receive location information, but power consumption increases and transmission collisions with uplink occur
Solution Approach 1:
The patent segments the location information transmission into two types: broadcast transmissions for general location data and unicast transmissions for dedicated, more accurate location information. This segmentation allows UEs to receive essential location information through broadcast while avoiding frequent wake-ups for power-consuming unicast transmissions, thereby reducing power consumption while maintaining transmission reliability.
Solution Approach 2:
The patent applies local quality by providing different types of location information to different needs: broadcast messages provide general location information to all UEs, while unicast messages provide dedicated, more accurate location information to specific UEs when needed. This differentiated approach ensures that location information is transmitted efficiently without wasting power on unnecessary frequent transmissions.
2Area of stationary object
If broadcast messages are used for satellite location information, then coverage is wide, but timing accuracy for uplink synchronization is insufficient
Solution Approach 1:
The patent segments location information delivery into broadcast and unicast channels. Broadcast messages provide wide coverage with general location data, while unicast messages provide targeted, high-precision timing information to specific UEs. This segmentation resolves the contradiction by assigning different functions to different transmission types based on their inherent characteristics.
Solution Approach 2:
The patent uses unicast transmission as an intermediary mechanism that complements broadcast transmission. While broadcast provides broad coverage, unicast acts as a mediator that delivers enhanced timing accuracy to individual UEs when needed, bridging the gap between wide coverage and precise timing.
3Measurement precision
If unicast transmission is used for satellite location information, then timing accuracy improves, but transmission frequency must be reduced to save power
Solution Approach 1:
The patent segments location information transmission into broadcast (for general coverage) and unicast (for high accuracy) components. This allows the system to maintain low transmission frequency for power-saving purposes while still achieving high timing accuracy when unicast transmissions are used, resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent changes the transmission parameters by using unicast transmission with lower frequency but higher accuracy characteristics. This parameter change allows the system to prioritize timing accuracy over transmission frequency, reducing power consumption while maintaining synchronization precision through selective unicast transmissions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which UEs may communicate with satellites or base stations, or both in a non-terrestrial network. Due to large distances between transmitting devices and receiving devices in a non-terrestrial network, the UE may account for propagation delay and frequency shift of communications with a satellite based on location information of the satellite. The UE may receive first satellite location information from a base station or a satellite, via a broadcast message. The UE may receive second satellite location information from the wireless network node via a unicast message, where both the first satellite location information and the second satellite location information relate to a same satellite. The UE may transmit an uplink communication via the satellite based on at least one of the first satellite location information or the second satellite location information.