SBFD Wake-Up Signal Prioritization for Uplink Collision Handling
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Solution Overview
Problem
In wireless communications systems employing subband full-duplex techniques, user equipment (UE) faces challenges in managing collisions between low-power wake-up signals (LP-WUS) and scheduled uplink transmissions, as it is unclear whether to prioritize LP-WUS monitoring or uplink message transmission in overlapping slots.
Innovation Solution
The UE is equipped with prioritization rules to determine whether to prioritize LP-WUS monitoring or uplink transmission based on factors such as the activation timeline and message priority, using a main radio and a low-power wake-up radio (LP-WUR) to manage these collisions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE monitors for LP-WUS in downlink resources that overlap with uplink transmission resources, then power saving is achieved through low-power wake-up signaling, but collision occurs between LP-WUS reception and uplink transmission
Solution Approach 1:
The patent segments the radio resources into distinct uplink and downlink subbands within the same time slot, allowing the UE to simultaneously transmit uplink signals in one subband and monitor LP-WUS in another subband without collision, thus resolving the conflict between power saving and communication reliability
Solution Approach 2:
The patent introduces frequency domain separation as an additional dimension to resolve the time-domain collision between uplink transmission and LP-WUS monitoring. By allocating different frequency subbands for uplink and downlink within the same time slot, the system enables simultaneous operation without interference
2Use of energy by moving object
If the UE prioritizes LP-WUS monitoring over uplink transmission, then power saving is maximized, but uplink communication reliability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different priorities to different frequency subbands based on their function. Uplink subbands are designated for transmission with high priority, while downlink subbands are designated for LP-WUS monitoring with lower priority, allowing simultaneous operation with appropriate priority handling
3Reliability
If the UE prioritizes uplink transmission over LP-WUS monitoring, then uplink communication reliability is maintained, but power saving benefits are reduced
Solution Approach 1:
The patent merges uplink and downlink operations in the same time slot by using different frequency subbands. This allows the UE to simultaneously perform uplink transmission and LP-WUS monitoring without mutual exclusion, achieving both reliability and power saving benefits concurrently
4Productivity
If subband full-duplex resources are used to allow simultaneous uplink and downlink in the same time slot, then spectral efficiency is improved, but resource collision between LP-WUS and uplink transmission occurs
Solution Approach 1:
The patent changes the resource allocation parameters by introducing frequency domain separation through subband division. This parameter change transforms the resource management from time-division to frequency-division within the same slot, enabling simultaneous uplink and downlink operations with clear resource boundaries
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein may enable a user equipment (UE) to identify prioritization rules for monitoring for low-power wake-up signals (LP-WUSs) or transmitting uplink messages in a subband full-duplex (SBFD) slot configured with both uplink and downlink resources. For example, the prioritization rules may instruct the UE to prioritize the LP-WUS over the uplink message or to prioritize the LP-WUS over the uplink message if the LP-WUS. In some examples, the prioritization rules may instruct the UE to both monitor for the LP-WUS via a low-power wake-up radio (LP-WUR) and transmit the uplink message with a main radio of the UE. In some examples, the UE may receive configuration information indicating the one or more prioritization rules.