Layer Mapping for Piggybacked DCI in Wireless Systems
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Solution Overview
Problem
Conventional methods for configuring piggybacked downlink control information (DCI) on wireless communications systems are inefficient, particularly in high-frequency bands where power consumption is high due to increased control channel monitoring occasions and reduced opportunities for transmitting multiple DCIs to multiple UEs.
Innovation Solution
The described techniques involve layer mapping methods for piggybacked DCI, where a base station or user equipment configures DCIs on a downlink shared channel by identifying optimal layer configurations based on modulation and coding schemes, signal-to-noise ratio, or payload sizes, allowing DCIs to be mapped to a single layer or split across multiple layers to reduce power consumption and payload size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI messages are transmitted on multiple layers, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments DCI messages across multiple layers (layer 0 and layer 1) based on payload size thresholds. When DCI payload exceeds a threshold, it is split and transmitted on both layers; otherwise, it uses only layer 0. This segmentation approach improves reliability for large payloads while maintaining simplicity for smaller payloads, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements dynamic layer mapping where the number of layers used for DCI transmission is not fixed but adapts based on payload size conditions. The system dynamically selects between single-layer and multi-layer transmission modes, allowing flexibility to balance reliability requirements against implementation complexity for different traffic scenarios.
2Reliability
If control channel monitoring density is increased, then DCI transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent merges DCI transmission with downlink data transmission by piggybacking DCI messages on the PDSCH (physical downlink shared channel). Instead of separate PDCCH transmissions, DCI is combined with data on the same physical channel, reducing the number of separate monitoring occasions and thereby reducing UE power consumption while maintaining reliable delivery through the robust PDSCH channel.
3Quantity of substance
If DCI payload size is increased, then more control information is transmitted, but transmission efficiency decreases
Solution Approach 1:
The patent transitions from single-layer to multi-layer transmission dimension when DCI payload size exceeds a threshold. By adding the layer dimension (using both layer 0 and layer 1), the system can efficiently handle larger control information volumes without sacrificing transmission efficiency, as the multi-layer approach provides better resource utilization and error resilience for large payloads.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may identify, for a user equipment (UE), a configuration for receiving a set of downlink control information (DCI) messages on one or more layers of a set of layers of a downlink shared channel. The base station may transmit, to the UE, a first DCI message in a downlink control channel, where the first DCI message may schedule resources of the downlink shared channel for the set of piggybacking DCI messages. The UE may receive the first DCI message and identify the configuration for receiving the set of DCI messages on the one or more layers of the downlink shared channel. The UE may receive, from the base station, the set of DCI messages on the one or more layers of the downlink shared channel based on the identified configuration.