Terminal High Frequency Band SSB Index Extension
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Solution Overview
Problem
High-frequency bands above 52.6 GHz face challenges with increased phase noise, propagation loss, and sensitivity to Peak-to-Average Power Ratio (PAPR) and power amplifier nonlinearity, requiring innovative solutions to maintain effective communication.
Innovation Solution
The terminal extends the synchronization signal block index, adjusts the gap between adjacent signal blocks, and changes the mapping pattern of slots to accommodate higher frequency bands, utilizing cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread OFDM with larger Sub-Carrier Spacing (SCS) to enhance beamforming and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of antenna elements are used to generate narrower beams for wider bandwidth and higher propagation loss, then beamforming capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the beamforming process by introducing multiple SSB indexes to represent different beam directions. Instead of requiring a single large-scale antenna array to cover all directions simultaneously, the system divides the coverage area into multiple sectors, each associated with a specific SSB index. This allows the terminal to perform beamforming in a segmented manner, reducing the complexity of the antenna system while maintaining comprehensive coverage capability.
Solution Approach 2:
The patent introduces a new dimension for beam management by extending the SSB index range beyond the conventional limit. This additional index dimension enables the system to differentiate and manage multiple beams without requiring proportional increases in antenna element count. The extended indexing scheme provides a virtual dimension for beam identification and selection, decoupling beam diversity from physical antenna scale.
2Reliability
If the Sub-Carrier Spacing is increased to reduce phase noise and propagation loss, then signal quality is improved, but the symbol period and slot period are shortened reducing time for signal processing
Solution Approach 1:
The patent applies preliminary action by having the network notify the terminal in advance about the SSB index and beam configuration through system information or RRC signaling. This advance notification allows the terminal to prepare its receiving unit and control unit before the actual signal transmission, compensating for the reduced symbol period. The terminal can pre-configure its beamforming parameters and synchronization settings, ensuring adequate processing time despite the shortened symbol duration caused by larger SCS.
3Area of stationary object
If the SSB index range is extended to accommodate more beams for high frequency band, then coverage area is improved, but the time gap between adjacent SSBs must be adjusted affecting synchronization timing
Solution Approach 1:
The patent implements dynamics by making the SSB time gap configurable and adaptable based on the operating frequency band and beam configuration. Rather than using a fixed time gap between adjacent SSBs, the system dynamically adjusts the timing interval according to the specific requirements of high-frequency operation and the number of beams being deployed. This dynamic timing adjustment optimizes the balance between providing sufficient time for terminal processing and maximizing the utilization of available time resources for extended coverage.
Data Source
AI summary
A terminal can use a high frequency band having a higher frequency than a certain frequency band including one or more frequency ranges. When using the high frequency band, the terminal extends a range of SSB than that when using the certain frequency band and receives the SSB of which the SSB has been extended.