UE-Driven Selective TX DC Location Reporting for Intra-Band Uplink CA
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Solution Overview
Problem
The challenge in 5G NR networks is efficiently determining and reporting the transmit direct current (TX DC) location for UEs with multiple configured bandwidth parts (BWPs) across component carriers, leading to increased signaling complexity and overhead.
Innovation Solution
The proposed solution involves flexible techniques for UEs to report TX DC locations based on network requests, unsolicited reporting when BWPs change, and storing reported locations for future reference, minimizing signaling complexity and energy consumption while supporting intra-band carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If UEs report TX DC location for every BWP change and configuration, then the network maintains accurate TX DC location information, but signaling overhead and complexity increase significantly
Solution Approach 1:
The patent applies partial action by having UEs report TX DC location information only in specific scenarios (initial configuration, BWP switching, intra-band CA changes) rather than continuously. This selective reporting maintains necessary information accuracy while significantly reducing signaling overhead compared to continuous reporting.
Solution Approach 2:
The patent implements periodic action through event-triggered reporting mechanisms where UEs report TX DC location information at specific events (configuration changes, BWP switches) rather than continuously. The network also uses stored information from previous reports until new information is needed, creating a periodic rather than continuous signaling pattern.
2Loss of information
If UEs continuously report TX DC location for all BWPs, then the network has complete information for all carrier aggregations, but energy consumption increases
Solution Approach 1:
The patent reduces energy consumption by implementing partial reporting where UEs transmit TX DC location information only when changes occur (BWP switching, configuration changes) rather than continuously. This event-driven approach maintains information completeness when needed while dramatically reducing the frequency of transmissions and associated energy usage.
Solution Approach 2:
The UE autonomously determines when to report TX DC location information based on detected events (BWP changes, CA configurations) without requiring continuous network requests. This self-service mechanism allows the UE to manage its own reporting schedule, reducing unnecessary energy consumption from continuous monitoring and reporting.
3Measurement precision
If the network requests TX DC location for each BWP configuration, then accurate location data is obtained, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by having the network store TX DC location information from initial UE configuration and BWP setups. When the same BWP configuration is reused, the network retrieves stored information rather than requesting new reports, maintaining accuracy while reducing repetitive signaling overhead.
Solution Approach 2:
The patent implements feedback mechanisms where the network tracks and stores reported TX DC location information for future reference. This feedback loop allows the network to determine when information is already available (avoiding redundant requests) and when new reports are necessary, optimizing the balance between accuracy and signaling overhead.
Data Source
AI summary
Embodiments include methods for a user equipment (UE) to transmit uplink (UL) data in a wireless network based on carrier aggregation (CA). Such methods include determining active UL bandwidth parts (BWPs) associated with at least two component carriers (CCs) within a frequency band; and determining at least one UL transmit direct current (TX DC) location for the active UL BWPs. Such methods also include selectively sending an indication of the at least one UL TX DC location to the wireless network. In some cases, such methods include transmitting, to the wireless network via the active UL BWPs, data arranged in at least one OFDM symbol having the respective at least one UL TX DC location. Other embodiments include complementary methods for a wireless network (e.g., one or more network nodes), as well as UEs and wireless networks configured to perform such methods.