User Terminal TDD Frequency Band Pair Switching
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Solution Overview
Problem
Current radio communication systems face challenges in efficiently performing Time Division Duplex (TDD) using DL/UL frequency band pairs with UL and DL frequency bands configured in a carrier, particularly in configuring and switching between frequency bands to avoid RF retuning and ensure contiguous uplink resource allocation.
Innovation Solution
A user terminal is equipped with a transmitting/receiving section for TDD using DL/UL frequency band pairs, where one pair has a shared center frequency and uneven bandwidth configuration, and another pair has a wider bandwidth, allowing for seamless switching between them without RF retuning, and optimizing uplink resource allocation by arranging PUCCH resources at the edges of the carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DL/UL frequency band pairs are configured with different bandwidths and center frequencies, then adaptability and versatility are improved, but device complexity increases due to the need to manage multiple frequency configurations and switching between them
Solution Approach 1:
The frequency band configuration is segmented into multiple DL/UL frequency band pairs, each with specific bandwidth and center frequency characteristics. This allows the system to divide the overall frequency management into manageable segments that can be independently configured and switched, reducing the complexity of managing a single large frequency configuration while maintaining adaptability.
Solution Approach 2:
The system implements dynamic switching between different DL/UL frequency band pairs based on communication requirements. The user terminal can switch between frequency band pairs with different bandwidths and center frequencies, allowing the system to adapt to varying data rate requirements while maintaining a structured approach to frequency management that prevents complexity from becoming unmanageable.
2Adaptability or versatility
If frequency bands are switched between different DL/UL pairs, then adaptability is improved, but loss of time increases due to RF retuning gaps required during switching
Solution Approach 1:
Multiple DL/UL frequency band pairs are pre-configured with different bandwidths and center frequencies before communication begins. This preliminary configuration allows the system to switch between frequency bands without requiring time-consuming RF retuning, as the terminal is already prepared to operate on the target frequency pair. The pre-configuration of multiple frequency pairs eliminates the need for real-time frequency synthesis adjustments during switching.
3Ease of operation
If PUCCH resources are allocated in the middle of the carrier bandwidth, then ease of operation is improved, but object-affected harmful factors increase due to restrictions on contiguous uplink resource allocation for other UEs
Solution Approach 1:
The PUCCH resources are extracted from the middle of the carrier bandwidth and repositioned to the edge of the carrier bandwidth. This extraction from the central location eliminates the harmful effect of blocking contiguous uplink resource allocation for other user terminals. By placing PUCCH resources at the edge, the system maintains ease of operation for PUCCH transmission while removing the restriction that would prevent other UEs from allocating contiguous uplink resources in the central frequency region.
Data Source
AI summary
A user terminal is disclosed including a transmitting/receiving section that performs transmission and reception by Time Division Duplex (TDD) by using a DL/UL frequency band pair that has a UL frequency band and a DL frequency band configured in a frequency direction in a carrier; and a control section that performs control to switch between a first DL/UL frequency band pair and a second DL/UL frequency band pair, and performs the transmission and the reception. In another aspect, a radio communication method of a user terminal is also disclosed.