Uplink Control Channel Sequence Allocation for Interference Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G new radio access technologies do not adequately address interference control in physical uplink control channels (PUCCH) that transmit one to two-bit UCI, which is crucial for efficient data transmission and IoT connectivity.
Innovation Solution
A terminal and communication method that decide and transmit uplink control channel sequences using cell identification and subcell-specific information, limiting the maximum sequences per resource block and separating cyclic shifts for ACK and NACK, to effectively manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of sequences allocated in one resource block is increased to support more terminals, then the system capacity is improved, but the interference between terminals increases
Solution Approach 1:
The patent divides the cyclic shift resources into multiple sets, where each set is allocated to specific terminals. By segmenting the resource block into multiple sets with different cyclic shift patterns, the system can serve more terminals while controlling interference through set-based allocation rather than uniform allocation.
Solution Approach 2:
Different terminals are assigned different cyclic shift patterns (local differentiation) within the same resource block. This local quality differentiation allows terminals to use the same frequency resources without experiencing identical interference conditions, thereby improving system capacity while managing interference through localized parameter variation.
2Device complexity
If the same cyclic shift pattern is used for all terminals in one resource block, then the implementation is simplified, but the interference control becomes insufficient
Solution Approach 1:
The patent segments the cyclic shift patterns into multiple sets and associates each set with specific terminals. This segmentation maintains implementation simplicity through structured allocation while significantly improving interference control by ensuring different terminals use different cyclic shift patterns within the same resource block.
3Productivity
If more resource blocks are allocated for PUCCH to increase data transmission capacity, then the data transmission capacity is improved, but the frequency utilization efficiency decreases
Solution Approach 1:
The patent merges multiple terminals into the same resource block by using different cyclic shift patterns, allowing multiple terminals to share frequency resources simultaneously. This merging approach increases data transmission capacity while maintaining frequency utilization efficiency through multiplexing rather than requiring separate resource blocks for each terminal.
Data Source
AI summary
In a terminal, a control unit decides a sequence used for an uplink control channel, in accordance with uplink control information, and a transmission unit transmits the uplink control information using the sequence. Here, the sequence is calculated using cell identification information that identifies the cell to which the terminal belongs, and subcell-specific information relating to at least one subcell included in the cell.