Broadcast Beam-Sweeping with Beam-Index Aided PBCH Decoding
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face challenges in reliably decoding broadcast information, like the Physical Broadcast Channel (PBCH) in LTE, due to limitations in transmitting and receiving additional useful information alongside broadcast data, leading to potential decoding errors.
Innovation Solution
The proposed solution involves transmitting broadcast information and beam/symbol index information jointly encoded in multiple beams, allowing receiving devices to combine log-likelihood ratios (LLRs) from adjacent beams for improved decoding reliability, using a method that combines LLRs from beams with different beam indices through exclusive OR operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If broadcast information and beam index information are jointly encoded in multiple beams, then the quantity of transmitted information increases, but the decoding reliability deteriorates due to potential decoding errors
Solution Approach 1:
The patent combines broadcast information and beam index information into a single joint encoding scheme transmitted across multiple beams. The receiving device merges LLRs from multiple received beams to decode the jointly encoded information, achieving both increased information transmission and maintained decoding reliability through soft combining of LLRs from different beam instances
Solution Approach 2:
The system performs preliminary beam sweeping transmissions of jointly encoded broadcast and beam index information before the receiving device needs to decode the final information. Multiple beams transmit the same jointly encoded data in advance, allowing the receiver to accumulate LLRs from these preliminary transmissions to improve decoding reliability
2Adaptability or versatility
If additional beam index information is transmitted alongside broadcast information, then the usefulness of communicated information increases, but the complexity of decoding jointly coded information increases
Solution Approach 1:
The patent segments the decoding process into distinct stages: first determining LLRs from received signals, then combining LLRs from multiple beams, and finally decoding the jointly encoded broadcast and beam index information. This segmentation of the decoding complexity into manageable steps reduces the overall computational burden while maintaining the ability to transmit additional useful information
Data Source
AI summary
Various features related to decoding jointly coded broadcast information and beam/symbol index information to achieve higher reliability and reduced decoding errors from the perspective of a receiving device such as a UE are described. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be configured to receive a first beam and a second beam of a plurality of beams from a base station, the first beam including broadcast information and a first beam index information jointly encoded together, and the second beam including broadcast information and a second beam index information jointly encoded together, determine a first LLR of the first beam, determine a second LLR of the second beam, and decode the broadcast information and the first beam index information in the first beam based on both the first LLR and the second LLR.