Bandwidth-Limited UE Initial Access via Segmented CORESET Selection
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Solution Overview
Problem
Bandwidth-limited user equipment (UE) in mobile networks face challenges in establishing connections due to their reduced capabilities, which are not accommodated by existing initial access procedures, leading to failures in acquiring legacy System Information Block #1 information and performing initial access procedures.
Innovation Solution
The method involves acquiring a Synchronization Signal Block (SSB) with a Master Information Block (MIB) to determine identifying bits, identifying an initial control resource set (CORESET) based on these bits, and monitoring it for Downlink Control Information (DCI) with a cyclic redundancy code scrambled by a bandwidth-limited System Information Radio Network Temporary Identifier (SI-BL-RNTI), allowing bandwidth-limited UEs to select a portion of the CORESET within their capability and acquire System Information Block #1 through a punctured Physical Downlink Shared Channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy initial access procedure is used for bandwidth-limited UE, then network compatibility is maintained, but connection establishment fails due to bandwidth capability constraints
Solution Approach 1:
The initial control resource set (CORESET) is segmented into multiple candidate CORESETs with different bandwidth configurations. The UE selects a CORESET whose bandwidth is appropriate for its capability, enabling both full-bandwidth and bandwidth-limited UEs to successfully establish connections using the same procedure.
Solution Approach 2:
The system dynamically adapts the initial access procedure by allowing the UE to select from multiple CORESET configurations based on its bandwidth capability. This dynamic selection enables the same initial access procedure to serve different UE types without requiring separate procedures.
2Loss of information
If full-bandwidth initial CORESET is configured, then system information can be transmitted, but bandwidth-limited UE cannot acquire the information due to insufficient bandwidth
Solution Approach 1:
The initial CORESET is divided into multiple candidate CORESETs with different bandwidths. Each CORESET is configured with identifying bits that indicate its bandwidth characteristics, allowing the UE to select an appropriate CORESET without requiring complex reconfiguration.
Solution Approach 2:
The system changes the bandwidth parameter of the initial CORESET based on UE capability. By providing multiple CORESET configurations with different bandwidth parameters and allowing UE selection, the system accommodates both full-bandwidth and bandwidth-limited UEs effectively.
3Adaptability or versatility
If multiple candidate CORESETs are provided for UE selection, then bandwidth-limited UE can establish connection, but initial access procedure complexity increases
Solution Approach 1:
Multiple candidate CORESETs are pre-configured with identifying bits before the UE performs initial access. This preliminary configuration allows the UE to autonomously select an appropriate CORESET based on its bandwidth capability without requiring complex real-time configuration or network signaling during the initial access phase.
Data Source
AI summary
A system and method for accommodating reduced capability user equipment in a mobile network. The method may include a method for accommodating bandwidth-limited UEs in the initial access process, employing an extended System Information Block #1, or employing, for bandwidth-limited UEs, a separate Synchronization Signal Block, a separate initial Control Resource Set, and a separate Radio Resource Control System Information Block #1.