AUL-DFI Timing Signal for 5G Uplink Feedback
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Solution Overview
Problem
Current wireless communication systems face interference and communication inefficiencies due to the need for medium-sensing procedures in shared radio frequency spectrum, particularly in 5G networks, which can lead to increased signaling overhead and latency when multiple network operating entities contend for shared resources.
Innovation Solution
Implementing a method where UEs receive a minimum processing time signal from a serving base station to correctly interpret downlink feedback information (DFI) for autonomous uplink (AUL) transmissions, allowing them to differentiate between acknowledged and pending AUL transmissions based on the processing time, thereby reducing the need for medium-sensing and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If medium-sensing procedures are implemented in shared spectrum access, then interference between network operating entities is reduced, but signaling overhead and latency increase
Solution Approach 1:
The base station performs preliminary processing of AUL transmissions and prepares DFI messages in advance, allowing UEs to interpret acknowledgments without waiting for medium-sensing procedures. The minimum processing time signal establishes a predetermined timeline that eliminates the need for real-time sensing before feedback can be transmitted.
Solution Approach 2:
The patent extracts the medium-sensing requirement from the feedback transmission process by using autonomous uplink transmissions that do not depend on medium availability sensing. The DFI message delivery is separated from the sensing procedure, allowing feedback to be transmitted independently of medium-access contention.
2Productivity
If default acknowledgement values are used for AUL transmissions, then signaling overhead is reduced, but communication efficiency decreases due to inability to differentiate pending from acknowledged transmissions
Solution Approach 1:
The base station provides explicit feedback through DFI messages that contain acknowledgment information for multiple AUL transmissions. The feedback mechanism uses timing relationships (minimum processing time) to enable UEs to distinguish between acknowledged and pending transmissions, eliminating the need for default values and improving communication efficiency.
Solution Approach 2:
The system dynamically determines transmission status based on the minimum processing time parameter. UEs calculate whether a transmission is acknowledged or pending by comparing the elapsed time since transmission against the minimum processing time signal, allowing flexible and accurate status differentiation without static default values.
3Measurement precision
If minimum processing time signaling is implemented, then UE interpretation of AUL-DFI is improved, but device complexity increases
Solution Approach 1:
The base station signals a minimum processing time parameter that UEs use to determine transmission status. This single parameter change enables accurate interpretation of DFI messages without requiring complex timing management, as the parameter provides a clear threshold for distinguishing acknowledged from pending transmissions.
Data Source
AI summary
Timing considerations for autonomous uplink (AUL) downlink feedback information (AUL-DFI) is disclosed. With the flexible timeline for new radio (NR) operations, signaling of the processing timeline may be used for the served user equipments (UEs) to properly interpret the acknowledgement information in the AUL-DFI. The UE receives a signal identifying a minimum processing time of the serving base station to process AUL. Using the knowledge of the minimum processing time, the UE determines which of the outstanding AUL transmissions are accurately addressed in the AUL-DFI and which are still pending. Additional signaling to the UE may instruct the UE when to implement any changes to transmission parameters also signaled via the AUL-DFI. Slots prior to the indicated change time will be transmitted using the current parameters, while slots after the indicated time will use the updated parameters from the AUL-DFI.