PSBCH Message Encoding for 5G V2X TDD Configuration
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Solution Overview
Problem
The challenge of indicating 5G V2X TDD configuration information within a limited field size of 12 bits in SL system configuration poses difficulties in design, particularly in assigning information to each code point.
Innovation Solution
A method for user equipment to set and transmit a 12-bit message in the physical sidelink broadcast channel (PSBCH) to indicate sidelink time division duplex configuration, using 1 bit to indicate pattern 1 or both patterns of tdd-UL-DL-ConfigurationCommon, or setting all bits to '1' for frequency division duplex when tdd-UL-DL-ConfigurationCommon is not provided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDD configuration information is indicated in a 12-bit field in SL system configuration, then the configuration can be transmitted in limited bandwidth, but the design complexity increases due to the need to assign information to each code point
Solution Approach 1:
The 12-bit field is segmented into multiple parts: 1 bit for indicating whether pattern 1 or both patterns are used, and additional bits for indicating specific TDD configuration parameters. This segmentation allows systematic organization of configuration information within the limited bit field, reducing design complexity while maintaining comprehensive configuration capability.
Solution Approach 2:
The patent uses parameter encoding to represent TDD configuration information. By defining specific parameter values for different TDD configurations (e.g., different UL-DL patterns, periodicities), the system can efficiently convey configuration data within the 12-bit constraint, balancing information completeness with field size limitations.
2Ease of operation
If all 12 bits are set to '1' for FDD cell or when tdd-UL-DL-ConfigurationCommon is not provided, then the indication is simplified, but information completeness is reduced
Solution Approach 1:
The patent extracts the essential TDD configuration indication from the full configuration data. By using a simplified all-'1' pattern for FDD cells or when TDD configuration is not provided, the system separates cases where detailed configuration is needed from cases where a default or absent configuration is acceptable, reducing unnecessary information transmission while maintaining accuracy where needed.
Data Source
Figure 1~2
AI summary
According to the present invention, provided is a method performed by user equipment, characterized by comprising: setting content of a message of 12 bits in a PSBCH of an S-SS/PSBCH block; and transmitting the S-SS/PSBCH block. One bit of the 12 bits is used to indicate whether pattern 1 is used or both of pattern 1 and pattern 2 are used for TDD configuration, and for FDD, or for a spectrum supporting only a PC5 interface and not provided with the TDD configuration, the 12 bits are all set to '1'.