PBCH Beam Hopping and Polar Coding for NR Broadcast Reliability
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Solution Overview
Problem
Current 5G New Radio (NR) systems face challenges in reducing beam sweep overhead and energy consumption for Physical Broadcast Channel (PBCH) transmissions, while also efficiently transmitting system information and enhancing PBCH performance.
Innovation Solution
The method involves determining a PBCH beam hopping pattern and adjusting it based on the direction distribution of wireless transmit/receive units, using a concatenated master information block with cyclic redundancy check (CRC) bits and polar encoding for efficient channel coding and rate matching, and employing beam hopping and full beam sweeping techniques to optimize PBCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweeping is performed for PBCH transmission to ensure coverage, then reliability is improved, but beam sweep overhead and energy consumption increase
Solution Approach 1:
The beam sweeping process is segmented into multiple beam hopping patterns. Instead of performing a complete beam sweep for every PBCH transmission, the system divides the beam space into multiple sectors and hops between them systematically. This segmentation allows the network to cover multiple directions over time while reducing the frequency and overhead of complete beam sweeps, thereby lowering energy consumption while maintaining coverage reliability.
Solution Approach 2:
The patent implements periodic beam hopping patterns where beams are transmitted in a repeating sequence across different directions. By using periodic action instead of continuous full beam sweeping, the system maintains reliable coverage through regular updates while significantly reducing the energy consumption and overhead associated with frequent complete sweeps. The periodic nature allows predictable resource allocation and efficient energy management.
2Use of energy by moving object
If beam sweep overhead is reduced to save energy, then energy efficiency is improved, but system information transmission efficiency deteriorates
Solution Approach 1:
The system performs preliminary beam hopping patterns and direction distribution analysis before full PBCH transmissions. By预先 establishing beam hopping patterns and analyzing direction distribution, the network can optimize subsequent transmissions to be more efficient. This preliminary action enables the system to identify optimal beam directions and patterns, improving energy efficiency while maintaining effective system information delivery.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system monitors the effectiveness of beam hopping patterns and adjusts them based on observed performance. Through feedback, the network can optimize beam directions, hopping patterns, and resource allocation to improve both energy efficiency and information transmission efficiency simultaneously. The feedback loop enables continuous optimization without requiring excessive beam sweeps.
3Reliability
If conventional channel coding is used for PBCH, then implementation simplicity is maintained, but error correction performance deteriorates
Solution Approach 1:
The patent employs polar codes with variable coding rates and parameters optimized specifically for PBCH transmissions. By changing the coding parameters (such as code rate, block length, and polarization pattern) based on channel conditions and requirements, the system achieves superior error correction performance compared to conventional fixed-parameter codes. This parameter optimization allows high reliability while managing complexity through standardized polar code structures.
Solution Approach 2:
The system replaces conventional mechanical/algorithmic channel coding approaches with polar code-based encoding and decoding mechanisms. Polar codes provide a more efficient mathematical framework for error correction, leveraging polarization phenomena to achieve better performance. This substitution introduces enhanced error correction capabilities while the standardized polar code algorithms keep implementation complexity manageable through systematic encoding and belief propagation decoding.
Data Source
AI summary
A method for transmitting system information on a PBCH is described herein. A transmission/reception point (TRP) may generate a concatenated master information block (MIB) transport block that includes information bits associated with system bandwidth information, timing information, system frame number (SFN), a beam sweeping configuration, and a control resource set (CORESET). The TRP may then attach at least 16 cyclic redundancy check (CRC) bits to the concatenated MIB and then prioritize the concatenated MIB and the at least 16 CRC bits based on content. The TRP may then perform channel coding of the prioritized concatenated MIB and the at least 16 CRC bits to produce coded bits using at least one polar encoder with a coding rate that is less than ⅓, perform rate matching via repetition on the coded bits, and then transmit the rate matched, coded bits on the PBCH of a radio frame.