Mixed Numerology SSB and CORESET Multiplexing for 5G Initial Access
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Solution Overview
Problem
In wireless communication systems, particularly in 5G New Radio (NR) networks, the increased subcarrier spacing for initial access signals such as ControlResourceSet0 (CORESET #0) and System Information Block 1 (SIB1) poses challenges in mixed numerology operations, leading to issues like RA-RNTI calculation overflow and increased latency, especially when transitioning to higher frequency ranges like 52-71 GHz.
Innovation Solution
A processor-based solution that employs a mixed numerology multiplexing pattern for SSB and CORESET #0/RMSI transmissions, using different subcarrier spacings (e.g., 120 kHz for SSB and 480 kHz or 960 kHz for CORESET #0/RMSI), and modifies the RA-RNTI calculation by segmenting the PRACH transmission window and introducing a scaling factor to ensure the RA-RNTI remains within a 16-bit field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If increased subcarrier spacing (480 kHz or 960 kHz) is used for CORESET #0 and SIB1 transmissions in mixed numerology operations, then the system can support extended frequency ranges (52-71 GHz), but RA-RNTI calculation overflow occurs and latency increases
Solution Approach 1:
The PRACH transmission window is divided into multiple segments, and the RA-RNTI calculation is modified to incorporate a segment index parameter. This segmentation approach allows the system to handle extended frequency ranges with higher subcarrier spacing while preventing RA-RNTI overflow by distributing random access occasions across different segments within the transmission window
Solution Approach 2:
The patent modifies the RA-RNTI calculation parameters by introducing a segment index and adjusting the formula to account for mixed numerology operations. This parameter change enables the system to support extended frequency ranges while maintaining RA-RNTI within valid calculation limits
2Adaptability or versatility
If increased subcarrier spacing is used for initial access signals, then higher frequency ranges can be supported, but latency increases during initial access procedures
Solution Approach 1:
The system dynamically selects different subcarrier spacings for different signal types (SSB uses one numerology while CORESET #0 and SIB1 use another), allowing flexible adaptation to frequency range requirements while optimizing initial access latency through coordinated resource allocation across the mixed numerology framework
3Adaptability or versatility
If mixed numerology is used for SSB and CORESET #0 transmissions, then extended frequency ranges are supported, but network complexity increases
Solution Approach 1:
The modified RA-RNTI calculation and segmented PRACH window approach provide a universal solution that works across both legacy and extended frequency ranges. This multi-functionality allows the same framework to handle different numerology configurations without requiring separate processing paths, thereby reducing overall network complexity despite the mixed numerology operation
Data Source
AI summary
A user equipment (UE) is configured to receive a synchronization signal block (SSB) transmission with a first subcarrier spacing (SCS) in an SSB burst window (SSBW), decode the SSB transmission to determine parameters for a control resource set 0 (CORESET #0) to be transmitted in the SSBW using a second SCS that is different from the first SCS, monitor physical downlink control channel (PDCCH) candidates in the determined CORESET #0 based on a mapping between the SSB transmission and the CORESET #0 and decode the PDCCH and a system information block 1 (SIB1) scheduled by the PDCCH in the SSBW.