Wireless Device Random-Access Power Control for Asymmetric Channels
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Solution Overview
Problem
Wireless devices face challenges in accurately determining transmission power for asymmetric uplink and downlink channels, leading to inefficiencies and reduced likelihood of successful communication.
Innovation Solution
The wireless device determines transmission power based on information in a message from the computing device, using a pathloss offset when indicated, allowing for more precise power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wireless device uses a single transmission power determination method for all computing devices, then the device complexity is reduced, but the transmission precision and reliability deteriorate due to asymmetric uplink and downlink channel characteristics
Solution Approach 1:
The patent segments the power determination approach by computing device type. For anchor TRPs, the device uses downlink-based pathloss estimation without offset. For uplink-only TRPs, it uses uplink-based pathloss estimation with offset. This segmentation resolves the contradiction by allowing precise power control for each TRP type while maintaining manageable overall complexity through clear differentiation rules.
Solution Approach 2:
The patent applies local quality by using different pathloss offset values for different computing device types. Specifically, a first pathloss offset is applied for anchor TRPs while a second (different) pathloss offset is applied for uplink-only TRPs. This localized adaptation to different TRP characteristics enables precise power determination for each scenario without requiring a completely separate system for each case.
2Reliability
If the wireless device accurately determines transmission power for each computing device type, then the reliability of communication is improved, but the device complexity increases due to multiple pathloss offset configurations
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple pathloss offset values in the wireless device before communication begins. The device is provided with a first pathloss offset for anchor TRPs and a second pathloss offset for uplink-only TRPs through RRC configuration. This advance preparation enables the device to quickly select the appropriate offset based on TRP type without complex real-time calculations, thereby improving reliability while controlling complexity.
Solution Approach 2:
The patent applies dynamics by making the pathloss offset selection adaptive based on the identified TRP type. The wireless device dynamically selects which pathloss offset to use depending on whether it is communicating with an anchor TRP or an uplink-only TRP. This dynamic adaptation improves communication reliability for each specific scenario while maintaining manageable complexity through clear selection criteria based on TRP classification.
3Productivity
If the wireless device uses pathloss offset for transmission power determination, then the transmission efficiency is improved, but the energy consumption increases due to additional power control calculations
Solution Approach 1:
The patent applies partial action by selectively applying pathloss offset only when necessary - specifically, when communicating with uplink-only TRPs. For anchor TRPs, the device uses the simpler downlink-based pathloss estimation without offset. This selective application improves transmission efficiency for the scenarios that require it (uplink-only TRPs) while minimizing additional energy consumption by avoiding unnecessary offset calculations in other scenarios.
Data Source
AI summary
A wireless device may be configured to communicate with multiple computing devices, such as transmission/reception points. A message from a first computing device may cause the wireless device to initiate a random access procedure for communication with the first computing device or for uplink-only communication with a second computing device or a third computing device. Based on one or more fields of the message, the wireless device may determine whether to use a pathloss offset and/or which pathloss offset value to use for determination of a transmission power for the random access procedure.