Uplink Control Information Transmission for Bandwidth Part Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing LTE systems face challenges in controlling half-duplex communication, particularly in future radio communication systems where UL and DL are switched in units of a symbol, leading to interference issues due to differing slot formats across cells.
Innovation Solution
A user terminal is equipped with a receiving section to receive information about slot formats for cells and a control section to determine the appropriate slot format based on whether full-duplex communication is supported, ensuring proper half-duplex communication by limiting UL and DL operations in cells and applying consistent slot formats across cells to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slot formats are configured differently for multiple cells to support flexible UL/DL switching in symbol units, then communication flexibility and spectral efficiency are improved, but interference between UL and DL signals increases due to half-duplex constraints
Solution Approach 1:
The patent applies local quality by configuring different slot formats for different cells based on their specific UL/DL switching requirements. Each cell can have its own slot format configuration (e.g., first slot format for first cell, second slot format for second cell) to optimize local communication flexibility while managing interference through cell-specific control rather than uniform configuration.
2Object-affected harmful factors
If a user terminal performs half-duplex communication by controlling UL and DL operations, then simultaneous transmission and reception interference is reduced, but communication latency increases due to sequential operations
Solution Approach 1:
The patent applies preliminary action by having the network side configure slot formats in advance before actual communication occurs. The slot format configuration is established beforehand, allowing the user terminal to know the expected UL/DL switching pattern ahead of time, which enables better timing control and reduces latency by avoiding last-minute adjustments.
Solution Approach 2:
The patent applies dynamics by enabling dynamic switching between different slot formats based on real-time communication needs. The system can transition from static subframe-based UL/DL configuration to dynamic symbol-level switching, allowing flexible adaptation to changing traffic conditions while maintaining half-duplex constraints through controlled switching timing.
3Reliability
If slot format information is transmitted for each cell individually, then communication reliability is improved through precise control, but signaling overhead increases
Solution Approach 1:
The patent applies merging by combining slot format information for multiple cells into a single transmitted message structure. Instead of transmitting separate slot format information for each cell individually, the system uses a unified approach where slot format information for the first cell and second cell is included together in one transmission, reducing the total amount of signaling overhead while maintaining reliable cell-specific control through proper message formatting and parsing.
Data Source
AI summary
A terminal is disclosed including a transmitter that performs an uplink (UL) transmission; and a receiver that performs a downlink (DL) reception, wherein the transmitter does not perform the UL transmission in a period after a last symbol of the DL reception. In other aspects, a radio communication method, a base station, and a system are also disclosed.