PDCCH Coding Rate Control for Flexible PDCCH-PDSCH Multiplexing
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Solution Overview
Problem
Current PDCCH/PDSCH multiplexing designs suffer from ambiguity in determining modulation order and coding rate, limiting efficient resource utilization and integration in wireless communications systems, particularly in non-millimeter wave bands.
Innovation Solution
Implement beta-based rate control for PDCCH to align resource element usage with DCI formats, allowing flexible and efficient multiplexing of PDCCH and PDSCH by indicating coding rates based on payload size and resource allocation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static resource allocation units are used for PDCCH regardless of payload size, then device complexity is reduced, but resource efficiency deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation for PDCCH where the resource allocation unit is adjusted based on the DCI payload size. When payload size varies, the system dynamically selects appropriate resource allocation units (e.g., different numbers of resource elements or resource blocks), allowing efficient utilization of wireless resources while adapting to different control information requirements.
Solution Approach 2:
The system changes the parameter of resource allocation unit size based on the DCI payload size. By establishing a relationship between payload size and resource allocation unit, the system optimizes resource efficiency without significantly increasing device complexity, as the mapping can be implemented through predefined tables or simple calculation rules.
2Loss of energy
If PDCCH and PDSCH are tightly integrated and multiplexed, then resource efficiency is improved, but ambiguity in determining modulation order and coding rate increases
Solution Approach 1:
The patent segments the control information by introducing format-specific coding rate values for different DCI formats. Each DCI format (e.g., format 0, format 1, format 2) has its own associated coding rate value, which eliminates ambiguity when determining the coding rate for multiplexed PDCCH and PDSCH transmissions.
Solution Approach 2:
The patent introduces coding rate values as intermediary parameters that bridge the PDCCH and PDSCH. These coding rate values are indicated to the UE and serve as mediators to resolve the ambiguity in determining modulation order and coding rate when PDCCH and PDSCH are multiplexed together, enabling reliable demodulation and decoding.
3Adaptability or versatility
If multiple DCI formats with varying payload sizes are supported, then adaptability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent creates a universal resource allocation mechanism that works across multiple DCI formats. By establishing a general relationship between payload size and resource allocation unit that applies to all DCI formats, the system maintains adaptability to different formats while avoiding format-specific complex allocation rules.
Solution Approach 2:
The system performs preliminary configuration by establishing predefined mappings or tables that associate different payload sizes with appropriate resource allocation units. This preliminary action simplifies runtime resource allocation, as the UE and network entity can directly lookup or calculate the appropriate resource allocation based on the known payload size without complex real-time decisions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message indicating a coding rate value corresponding to a downlink control information (DCI) format. The coding rate value may indicate a coding rate of the DCI format. The UE may receive, via a quantity of resource elements (REs) that is based on a payload size and the coding rate value, a DCI message of the DCI format that includes scheduling information associated with a data message, and the UE may receive the data message in accordance with the scheduling information. In some examples, the UE may receive the DCI message via a physical downlink control channel (PDCCH) multiplexed with a physical downlink shared channel (PDSCH) that carries the data message.