DCI Feedback Reduction for Semi-Persistent Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially in semi-persistent scheduling (SPS) for downlink (DL) communications, there is a challenge in efficiently managing SPS occasions, as user equipment (UE) may unnecessarily perform packet decoding and transmit HARQ feedback for empty SPS resources, leading to power and resource utilization inefficiencies due to the lack of clear indication from the base station (BS) about cancelled or non-empty occasions.
Innovation Solution
The base station transmits a mode indication and occasion-identification parameters to the UE, using bitmaps or occasion indices to clearly distinguish between cancelled and non-empty SPS occasions, allowing the UE to avoid unnecessary decoding and feedback for empty occasions, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the BS does not provide clear indication of cancelled SPS occasions, then the DCI message structure remains simple, but the UE performs unnecessary packet decoding and transmits unnecessary HARQ feedback, leading to power inefficiency and resource waste
Solution Approach 1:
The BS transmits occasion-identification parameters in advance within the DCI message, enabling the UE to pre-determine which SPS occasions are cancelled before attempting packet decoding. This preliminary indication prevents the UE from wasting power on decoding empty occasions while maintaining a manageable DCI structure through efficient parameter encoding.
Solution Approach 2:
The patent introduces occasion-identification parameters as an intermediary mechanism between the BS and UE. These parameters act as a mediator that conveys cancellation information without requiring complex DCI restructuring, enabling the UE to identify empty occasions and avoid unnecessary decoding operations.
2Productivity
If the UE monitors all SPS occasions without identification parameters, then the DCI message remains compact, but the UE cannot distinguish between cancelled and non-empty occasions, leading to inefficient resource utilization
Solution Approach 1:
The patent applies partial action by transmitting only the necessary occasion-identification parameters within the DCI message rather than complete occasion details. This selective transmission provides sufficient information for the UE to identify cancelled occasions while minimizing the increase in DCI message overhead, thus improving resource utilization efficiency without excessive signaling.
3Reliability
If the BS transmits detailed cancellation information for each SPS occasion, then the UE can accurately identify empty occasions and avoid unnecessary decoding, but the DCI message overhead increases significantly
Solution Approach 1:
The patent changes the parameter representation by using efficient encoding schemes for occasion-identification parameters within the DCI message. This parameter optimization maintains accurate identification of cancelled SPS occasions while minimizing the information overhead, thereby preserving reliability without excessive bandwidth consumption.
Data Source
AI summary
Wireless communications systems and methods related to semi-persistent scheduling (SPS) occasion cancellation or validation are provided. A base station (BS) transmits an SPS configuration to a UE indicating a plurality of SPS occasions. The BS further transmits to the UE a mode indication indicating an occasion-identification mode, the occasion-identification mode indicating whether one or more occasion-identification parameters identify one or more SPS occasions of the plurality of SPS occasions to be cancelled or to be used for transmission. The BS further transmits to the UE the one or more occasion-identification parameters. The BS performs SPS transmission based on the mode indication and the one or more occasion-identification parameters.