Uplink Acknowledgment Offset Mechanism for Contention-Based Wireless Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack an effective method for the base station to acknowledge uplink transmissions on contention-based resources, which can lead to misinterpretation of acknowledgments due to the possibility of multiple user equipment (UE) transmitting simultaneously, necessitating a mechanism to uniquely associate acknowledgments with specific UE.
Innovation Solution
The implementation of an offset-based mechanism to determine a downlink resource for acknowledging uplink transmissions, where the base unit applies an offset to a predetermined downlink resource based on information associated with the transmitting UE, such as a cell radio network temporary identifier (C-RNTI), to ensure accurate acknowledgment and identification of the transmitting UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UE transmit simultaneously on contention-based uplink resource, then uplink transmission efficiency is improved, but acknowledgment misinterpretation occurs
Solution Approach 1:
The patent segments the acknowledgment resource by associating each UE with a unique downlink resource through its identifier (C-RNTI). When a UE transmits on the contention-based uplink resource, the base station uses the UE's identifier to determine which specific downlink resource should be used for sending the acknowledgment back to that UE, thereby preventing misinterpretation among multiple UEs.
Solution Approach 2:
The patent introduces the UE identifier (C-RNTI) as an intermediary element that links the uplink transmission to the corresponding downlink acknowledgment resource. This intermediary mechanism allows the base station to accurately associate acknowledgments with specific UEs even when multiple UEs are transmitting simultaneously on the shared uplink resource.
2Measurement precision
If UE identifier is included in transmission, then UE identification accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-associating each UE with a unique downlink resource based on its identifier before the actual transmission occurs. The base station uses the UE's C-RNTI to pre-determine which downlink resource will be used for acknowledgment, eliminating the need to repeatedly transmit identifier information during the acknowledgment phase.
Solution Approach 2:
The patent changes the parameter approach by using the UE identifier to map to a specific downlink resource index rather than transmitting the identifier itself in the acknowledgment. This parameter transformation reduces overhead while maintaining identification accuracy, as the resource selection is based on pre-established mapping relationships.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A remote unit configured to transmit a message on a contention based uplink resource granted by a base unit wherein the message includes information associated with the remote unit. The remote unit also configured to determine a downlink resource on which the remote unit may receive a response to the message sent on the uplink resource by applying an offset to a predetermined downlink resource wherein the offset is based on the information associated with the wireless communication device.