Signaling Radio Transmission Mapping Types in 5G NR
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Solution Overview
Problem
Current 5G NR systems lack efficient methods to signal whether physical downlink shared channel (PDSCH) mapping type A or B is used, leading to inflexible system operation and wastage of bits in downlink control information (DCI) when only one mapping type is deployed.
Innovation Solution
Incorporating mapping type information into resource allocation information, such as a time allocation table, allowing network nodes to signal the mapping type along with time-domain resources to wireless devices, reducing the need for separate signaling and optimizing bit usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mapping type information is signaled separately from resource allocation information, then the system provides flexibility in indicating different mapping types, but it increases the number of bits required in downlink control information (DCI) and reduces efficiency when only one mapping type is deployed
Solution Approach 1:
The patent combines mapping type information with resource allocation information into a unified signaling mechanism. Specifically, the mapping type is indicated through the time allocation index in the DCI, which points to entries in a time allocation table that contains both time allocation parameters and mapping type information. This merging eliminates the need for separate signaling of mapping type, thereby reducing bit wastage while maintaining the ability to indicate different mapping types when needed.
Solution Approach 2:
The time allocation index serves multiple functions: it indicates the time allocation for the PDSCH transmission and simultaneously indicates the mapping type. The time allocation table is designed to contain entries that encode both time domain resource allocation and mapping type information, allowing a single field to perform multiple signaling tasks, thus improving efficiency without sacrificing adaptability.
2Reliability
If separate signaling of mapping type and time allocation is implemented, then complete information is provided to the UE, but the DCI structure becomes less efficient and more bits are required
Solution Approach 1:
The patent merges mapping type indication with time allocation indication by incorporating mapping type information into the time allocation table. The DCI contains a time allocation index that points to table entries containing both time allocation parameters (such as start symbol and length) and mapping type information. This unified structure ensures complete information is provided to the UE while simplifying the DCI structure and reducing the number of separate fields required.
3Manufacturing precision
If multiple time allocation tables are used for different mapping types, then precise control is achieved, but the system complexity increases
Solution Approach 1:
The patent employs a single time allocation table that serves multiple purposes: it provides precise time allocation control and simultaneously indicates the mapping type through the table entry selection. Each entry in the time allocation table contains both time domain resource allocation parameters and mapping type information, allowing the system to achieve precise control without requiring multiple separate tables, thus reducing system complexity while maintaining precision.
Data Source
AI summary
According to some embodiments, a wireless device is configured to receive resource allocation information from a network node. The wireless device comprises a radio interface and processing circuitry configured to receive radio resource allocation information for a wireless transmission. The radio resource allocation information comprises one or more time-domain resources for the wireless transmission and a mapping type for the wireless transmission. The mapping type refers to a reference signal placement within the wireless transmission (e.g., demodulation reference signal (DMRS) mapping Type A or Type B). The radio interface and processing circuitry are further configured to interpret the received radio resource allocation information to determine a mapping type for the wireless transmission.