Uplink SPS Release Acknowledgment via DCI Format 1A
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In traditional wireless telecommunications systems, there is no mechanism for user equipment (UE) to acknowledge uplink semi-persistent scheduling (SPS) resource release signals sent over the physical downlink control channel (PDCCH) using DCI format 0, making it unclear to the access device whether the UE received the release signal.
Innovation Solution
Using DCI format 1A for both uplink and downlink SPS resource release signals, with indicators in unused data fields to differentiate between uplink and downlink releases, allowing the UE to acknowledge uplink SPS resource release signals using the existing HARQ ACK mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI format 0 is used for uplink SPS resource release signals, then the release signal can be sent over PDCCH, but there is no mechanism for UE to acknowledge receipt of the release signal
Solution Approach 1:
The patent applies universality by enabling DCI format 1A to serve dual purposes: both downlink SPS resource release signals and uplink SPS resource release signals. This allows the existing HARQ ACK mechanism, originally designed for downlink acknowledgments, to be universally applied to both downlink and uplink release signal acknowledgments, eliminating the need for a separate acknowledgment mechanism for uplink releases
Solution Approach 2:
The patent introduces an intermediary approach by using the PHICH (Physical Hybrid ARQ Indicator Channel) as a mediator to carry HARQ ACK signals for uplink SPS resource release confirmations. The PHICH serves as the intermediary channel that enables the UE to send acknowledgment back to the access device, solving the reliability issue without requiring direct uplink resource allocation for acknowledgment
2Reliability
If DCI format 1A is used for both uplink and downlink SPS resource release signals, then acknowledgment mechanism is enabled, but data field differentiation is required
Solution Approach 1:
The patent applies local quality by introducing specific indicator bits within the DCI format 1A data fields to differentiate between uplink and downlink SPS resource release signals. By modifying local portions of the data structure (adding specific indicator fields), the system enables reliable signal type differentiation while maintaining the overall DCI format structure, thus achieving acknowledgment capability without excessive complexity
3Ease of operation
If separate mechanisms are created for uplink and downlink SPS resource release acknowledgment, then clarity is improved, but system complexity increases
Solution Approach 1:
The patent strongly applies universality by creating a single unified acknowledgment mechanism using HARQ ACK that works for both uplink and downlink SPS resource release signals. The system uses universal elements (PHICH channel, HARQ ACK format) that can handle both signal types, thereby improving ease of operation through consistency while avoiding the complexity of maintaining separate acknowledgment mechanisms for uplink and downlink
Data Source
AI summary
A method is provided for acknowledging a semi-persistent scheduling (SPS) uplink resource release. The method comprises receiving an SPS resource release signal over a physical downlink control channel in a Downlink Control Information (DCI) format 1A. The signal includes an indicator that indicates that the signal pertains to at least one of an uplink resource release and a downlink resource release. The method further comprises sending an acknowledgement to confirm the release of the resource.