Single-DCI SIB Repetition Scheduling for Coverage Recovery
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting system information blocks (SIBs) to user equipment (UEs) operating in reduced bandwidth, leading to increased latency and potential data loss due to SIB payload changes, especially in scenarios where UEs require multiple repetitions for synchronization.
Innovation Solution
The system employs a grant scheduling mechanism that allows for repetition-based SIB transmissions with a single downlink control information (DCI) indicating time-frequency resources for multiple repetitions, utilizing cyclic-shifted VRB-to-PRB mapping and redundancy versions to ensure consistent parameters across repetitions, enabling UEs to receive SIBs in the same or different bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetition-based SIB transmissions are used for UEs in reduced bandwidth, then coverage recovery and reception reliability are improved, but latency increases and data loss may occur due to SIB payload changes
Solution Approach 1:
The SIB transmission is divided into multiple repetitions that are scheduled using a single DCI with mapping configuration. Each repetition can be received in the same or different bandwidth, allowing the UE to segment the reception process across multiple time instances while maintaining consistency through the mapping configuration that references the first repetition's resources.
Solution Approach 2:
The mapping configuration is provided in advance within the single DCI before the actual SIB repetitions occur. This preliminary configuration allows the UE to pre-determine the time-frequency resources for subsequent repetitions, reducing processing latency and enabling more efficient reception without waiting for separate scheduling information for each repetition.
2Device complexity
If a single DCI schedules multiple SIB repetitions with mapping configuration, then device complexity and control signaling overhead are reduced, but the system must maintain consistent parameters across repetitions
Solution Approach 1:
A single DCI serves multiple functions by simultaneously providing the mapping configuration for multiple SIB repetitions. This universal scheduling approach eliminates the need for separate DCIs for each repetition, reducing control signaling complexity while the mapping configuration ensures parameter consistency across all repetitions through its reference to the first repetition's time-frequency resources.
3Adaptability or versatility
If SIB repetitions are transmitted in the same or different bandwidth, then adaptability to UE capabilities is improved, but UE retuning operations are required when bandwidth changes
Solution Approach 1:
The system dynamically allows SIB repetitions to be transmitted in the same or different bandwidth based on UE capabilities and network conditions. The mapping configuration supports this flexibility by referencing the first repetition's resources while allowing subsequent repetitions to use different bandwidths, enabling the UE to adapt its reception parameters accordingly.
Solution Approach 2:
The system changes the bandwidth parameter across SIB repetitions based on UE capabilities. When the bandwidth changes between repetitions, the UE performs retuning operations to adjust to the new bandwidth. This parameter change approach allows the system to optimize for different UE capabilities while the mapping configuration provides the necessary information for the UE to understand the resource allocation despite bandwidth variations.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a grant scheduling repetition-based system information block transmissions for the UE, the grant indicating a mapping configuration identifying time-frequency resources for a second repetition of a system information block transmission relative to a first repetition of the system information block transmission. The UE may receive, in a first subset bandwidth of a system bandwidth, the first repetition of the system information block transmission according to the grant. The UE may receive, in a second subset bandwidth of the system bandwidth, the second repetition of the system information block transmission according to the grant and based at least in part on the mapping configuration.