Mobile Terminal Bandwidth Adaptation for Base Station Compatibility
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Solution Overview
Problem
In a radio communication system supporting multiple bandwidths, mobile terminals need to connect to base stations with different bandwidths, requiring effective methods for setting proper transmission and reception bandwidths, especially for initial access and channel synchronization, which affects terminal configuration and channel implementation.
Innovation Solution
The solution involves configuring mobile terminals to support a maximum bandwidth value, allowing them to connect to base stations using various bandwidths by setting the downlink and uplink transmission bandwidths appropriately, with methods including preparing terminals for all supported bandwidths or ensuring a minimum maximum bandwidth support, and using pilot and data channels with different bandwidths for efficient scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile terminals are configured to support multiple bandwidths, then adaptability to different base stations is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth configuration where mobile terminals can adaptively adjust their operating bandwidth based on the base station they are connecting to. The terminal determines the bandwidth of the downlink common channel and configures its transmission and reception bandwidths dynamically, allowing it to support multiple bandwidth scenarios without requiring fixed hardware for each bandwidth type.
Solution Approach 2:
The patent changes the operational parameters of the mobile terminal based on the detected base station bandwidth. By identifying the bandwidth of the downlink common channel and adjusting the terminal's transmission and reception bandwidths accordingly, the system enables terminals to operate across different bandwidth configurations without increasing physical device complexity.
2Productivity
If a single bandwidth is used for all channels, then device complexity is reduced, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies different bandwidth configurations to different channels based on their specific requirements. The downlink common channel uses a bandwidth appropriate for its function, while uplink pilot channels and data channels use bandwidths optimized for their respective purposes. This local optimization of bandwidth allocation improves overall transmission efficiency without requiring uniform bandwidth across all channels.
Solution Approach 2:
The patent segments the bandwidth allocation by channel type, assigning appropriate bandwidths to downlink common channels, uplink pilot channels, and uplink data channels independently. This segmentation allows each channel to operate at optimal bandwidth, improving system productivity while managing complexity through structured bandwidth distribution.
3Productivity
If maximum bandwidth is allocated to all terminals, then transmission capacity is improved, but resource waste increases
Solution Approach 1:
The patent implements dynamic bandwidth allocation where mobile terminals transmit and receive signals at bandwidths matched to the actual base station configuration rather than always using maximum bandwidth. The terminal determines the appropriate bandwidth based on the downlink common channel and adjusts its uplink transmission accordingly, preventing resource waste while maintaining adequate transmission capacity.
Solution Approach 2:
The patent changes the operational bandwidth parameter of mobile terminals based on the detected base station bandwidth. By adjusting the terminal's transmission and reception bandwidths to match the actual system configuration, the patent optimizes resource utilization, ensuring sufficient transmission capacity without allocating excessive bandwidth that would be wasted.
Data Source
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Figure 3A~3B
AI summary
In a radio communication system defining a plurality of bandwidths, mobile terminals of kinds respectively corresponding to the plurality of bandwidths are accommodated in the system, and a minimum transmission bandwidth of the plurality of bandwidths is set as a transmission bandwidth of a downlink common channel. Or, every mobile terminal accommodated in the radio communication system is provided with a capability for processing a bandwidth equal to or greater than a predetermined value, and equal to or more than two transmission bandwidths that are equal to or less than a predetermined value are set as a transmission bandwidth of a downlink common channel. In the latter case, the mobile terminal identifies a bandwidth of a received downlink common channel.