Terminal Initial Access in High Frequency Bands
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Solution Overview
Problem
The challenge in wireless communication systems is to enable initial access in higher frequency bands, particularly above 52.6 GHz, where larger sub-carrier spacings and multiple beams are used, requiring effective arrangement of synchronization signals, control signals, and system information for efficient radio resource allocation.
Innovation Solution
A terminal is configured to receive blocks containing synchronization signals, broadcast channels, and control channels, with a control unit performing initial access based on system information, arranging these signals in consecutive slots across a frequency band with specific subcarrier spacings, such as 480 kHz or 960 kHz, to facilitate efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger subcarrier spacing is used in higher frequency bands, then data transmission rate and capacity are improved, but initial access complexity and resource arrangement difficulty increase
Solution Approach 1:
The patent applies parameter changes by adapting the arrangement period of synchronization signal blocks to the subcarrier spacing. Specifically, when subcarrier spacing is 480 kHz or larger, the arrangement period is set to 32 slots, whereas for smaller subcarrier spacings, a different period applies. This dynamic parameter adjustment resolves the contradiction by optimizing both transmission rate and access complexity for different frequency bands
Solution Approach 2:
The patent implements dynamics by making the synchronization signal block arrangement flexible and adaptive to different subcarrier spacings. The system dynamically adjusts the periodicity and timing of synchronization signals based on the configured subcarrier spacing, enabling the network to efficiently support both high-speed data transmission and simplified initial access procedures in higher frequency bands
2Adaptability or versatility
If multiple beams are used in higher frequency bands, then coverage and capacity are improved, but signal arrangement and resource allocation complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the synchronization signal transmission into multiple beams that are arranged in specific time-frequency slots. Each beam is transmitted in dedicated resource slots, allowing the system to cover multiple directions and areas simultaneously while maintaining organized and manageable resource allocation. This resolves the contradiction by enabling multi-beam coverage without overwhelming complexity
Solution Approach 2:
The patent utilizes another dimension by arranging multiple beams in the time domain through slot-based allocation rather than only in the frequency domain. By distributing synchronization signals across different time slots and beams, the system achieves enhanced coverage and capacity while keeping resource allocation structured and manageable through temporal separation
3Reliability
If synchronization signals are arranged in all consecutive slots, then initial access reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies periodic action by arranging synchronization signal blocks in a periodic manner with specific periodicity values (e.g., 32 slots for 480 kHz subcarrier spacing). Instead of occupying all consecutive slots uniformly, the signals are transmitted periodically at defined intervals, ensuring reliable initial access while leaving other slots available for data transmission and other services, thus resolving the contradiction between reliability and resource efficiency
Data Source
AI summary
A terminal includes: a reception unit configured to receive: a block including a synchronization signal and a broadcast channel; a control channel carrying control information; and a shared channel carrying system information, based on the control information; and a control unit configured to perform an initial access, based on the system information. The block is arranged in all of consecutive slots in a period in a case where a subcarrier spacing is applied in a frequency band.