Flexible PDCCH Numerology for Mixed-Bandwidth UE Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting flexible UE bandwidths due to varying capabilities among user equipment, limiting access for devices with different bandwidths, particularly in initial access scenarios.
Innovation Solution
The proposed solution involves designing flexible control channels and resource block grids that accommodate UEs with diverse bandwidths by using pre-defined bandwidths for synchronization and broadcast channels, allowing partial reception of physical downlink control channels, and indicating numerology and resource mappings through system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed bandwidth is allocated for control channels, then system simplicity is maintained, but UEs with different bandwidth capabilities cannot access the network flexibly
Solution Approach 1:
The control channel bandwidth is segmented into multiple possible configurations (e.g., different numbers of resource blocks). The system transmits control channels with different bandwidths according to different bandwidth indicators, allowing UEs to select and receive control channels matching their bandwidth capabilities. This segmentation enables flexible adaptation without requiring a single complex universal design.
Solution Approach 2:
The control channel bandwidth is made dynamic rather than fixed. The system can adjust the control channel bandwidth based on UE capabilities and network conditions by transmitting different bandwidth configurations. This dynamic approach allows the system to adapt to varying UE bandwidth requirements while maintaining operational simplicity through standardized adjustment mechanisms.
2Adaptability or versatility
If synchronization and broadcast channels use dynamic bandwidth allocation, then flexibility for different UEs is improved, but system complexity and resource management difficulty increase
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple bandwidth options for synchronization and broadcast channels before actual UE access. These bandwidth configurations are prepared in advance and can be selected based on UE capabilities. This preliminary preparation simplifies resource management during operation, as the system only needs to select from pre-defined options rather than dynamically creating configurations in real-time.
3Adaptability or versatility
If the system supports multiple bandwidth configurations for control channels, then UE bandwidth compatibility is improved, but the difficulty of detecting and measuring appropriate bandwidth increases
Solution Approach 1:
A bandwidth indicator acts as an intermediary between the multiple bandwidth configurations and the UE. This indicator explicitly tells the UE which bandwidth configuration to use for receiving control channels, eliminating the need for the UE to detect and measure multiple bandwidth options. The intermediary simplifies the UE's task to simply following the indicated bandwidth configuration.
Data Source
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AI summary
The disclosure concerns a method performed by a terminal and comprises: receiving, from a base station, a primary synchronization signal, PSS, and a secondary synchronization signal, SSS, based on a first subcarrier spacing; receiving, from the base station, a master information block, MIB, based on the first subcarrier spacing, wherein the MIB includes first information associated with a second subcarrier spacing for a physical downlink control channel, PDCCH, and second information associated with a resource for the PDCCH; identifying, based on the first information included in the MIB, the second subcarrier spacing for the PDCCH from one of a first subcarrier spacing set or a second subcarrier spacing set, wherein the first subcarrier spacing set corresponds to a lower frequency band and the second subcarrier spacing set corresponds to a higher frequency band; and receiving, from the base station, the PDCCH based on the second subcarrier spacing and the second information.