Block Acknowledgment for Multiple SPS Configurations
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in managing hybrid automatic repeat request (HARQ) feedback for multiple semi-persistently scheduled (SPS) configurations, leading to resource wastage and increased power consumption due to separate acknowledgments for each SPS occasion, especially when not all SPS occasions result in PDSCH transmissions.
Innovation Solution
Implementing a method where user equipment (UE) and network entities use block acknowledgments (BAs) to provide HARQ feedback for multiple SPS occasions within an acknowledgment window, allowing for either separate or shared BAs to reduce overhead, with options for variable or fixed payload sizes and NAK-only feedback to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate acknowledgments are transmitted for each SPS occasion, then HARQ feedback reliability is improved, but uplink resource overhead and power consumption increase
Solution Approach 1:
The patent combines multiple separate HARQ acknowledgments into a single block acknowledgment that covers multiple SPS occasions. The UE transmits one BA message containing acknowledgment information for multiple SPS configurations and occasions, reducing the number of separate uplink transmissions and associated power consumption while maintaining reliable feedback through comprehensive acknowledgment coverage.
2Reliability
If separate acknowledgments are transmitted for each SPS occasion, then HARQ feedback reliability is improved, but uplink resource overhead increases
Solution Approach 1:
Multiple separate acknowledgment messages are merged into a single block acknowledgment transmission. The BA message structure accommodates acknowledgment information for multiple SPS configurations and occasions within one uplink resource allocation, significantly reducing the quantity of uplink resources consumed compared to transmitting separate ACKs for each SPS occasion.
3Productivity
If block acknowledgments are used for multiple SPS occasions, then uplink resource efficiency is improved, but feedback precision for individual occasions may be reduced
Solution Approach 1:
The block acknowledgment is segmented to include individual acknowledgment information for each SPS occasion within the single BA message. The feedback structure contains separate acknowledgment fields or indicators for different SPS configurations and occasions, allowing precise feedback for each individual transmission while maintaining the efficiency benefits of consolidated uplink resource usage.
4Quantity of substance
If NAK-only feedback is implemented, then uplink resource overhead is reduced, but information completeness about received packets is decreased
Solution Approach 1:
The patent extracts and transmits only the essential negative acknowledgment information when NAK-only feedback is used. By focusing solely on indicating which packets require retransmission rather than providing complete status information for all packets, the solution reduces uplink resource overhead while maintaining sufficient information for the gNB to perform necessary retransmissions.
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to mechanisms for using block acknowledgments to acknowledge SPS occasions from multiple SPS configurations.