SIB Decoding Without PDCCH in Low SNR Networks
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Solution Overview
Problem
Conventional MIB and SIB decoding in new radio (NR) networks is inefficient, especially at low signal-to-noise ratio (SNR) conditions, as it requires decoding the physical downlink control channel (PDCCH), which can impede traffic flow and decoding performance.
Innovation Solution
A user equipment (UE) processor configured to receive and decode system information blocks (SIB) without decoding the PDCCH by determining scheduling information from downlink control information (DCI) carried on the PDCCH, and using additional information sources like GNSS for MIB decoding, such as timing information to determine the system frame number (SFN) for improved decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE decodes the PDCCH to obtain scheduling information for SIB, then the SIB can be decoded, but the decoding performance is degraded and traffic flow is impeded especially at low SNR conditions
Solution Approach 1:
The patent extracts the scheduling information from the PDCCH and places it directly into the SIB payload. This allows the UE to decode the SIB without needing to decode the PDCCH, thereby eliminating the congestion and performance degradation caused by PDCCH decoding while maintaining the ability to obtain scheduling information.
Solution Approach 2:
The patent merges the scheduling information that was previously carried on the PDCCH with the SIB payload. By combining these two elements, the system eliminates the need for separate PDCCH decoding while ensuring the UE still receives the necessary scheduling information for SIB operation.
2Reliability
If the UE decodes the entire MIB payload to obtain cell attachment information, then the cell attachment can be achieved, but the decoding efficiency is reduced at low SNR conditions
Solution Approach 1:
The patent applies preliminary action by pre-determining the system frame number (SFN) using timing information from GNSS or other sources before MIB decoding. This allows the UE to have prior knowledge of part of the MIB content, enabling more efficient decoding at low SNR conditions while still achieving complete cell attachment information.
3Ease of operation
If the UE decodes the PDCCH to obtain scheduling information, then the SIB decoding can proceed, but the overall decoding performance is congested
Solution Approach 1:
The patent extracts the scheduling information function from the PDCCH decoding process and embeds it directly in the SIB. This simplifies the UE's decoding operations by eliminating the need to decode the PDCCH, reducing device complexity while maintaining SIB decoding capability.
Data Source
AI summary
A user equipment (UE) is configured to receive, from a cell of a network, a system information block (SIB), determine values for scheduling information for the SIB without decoding a Physical Downlink Control Channel (PDCCH) corresponding to the SIB and decode the SIB using the scheduling information. A UE is also configured to receive, from a cell of a network, a message to be decoded, receive, from a source different from the cell, additional information related to a portion of the message, determine the portion of the message using the additional information and decode the message based at least in part on the determined portion of the message.