Uplink Control Information Collision Resolution via Priority Segmentation
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Solution Overview
Problem
In wireless communication systems, particularly in CoMP environments, there is a challenge in resolving collisions between transmission schedules of uplink control information (UCI) reports, which leads to inefficiencies and dropped reports due to limited payload capacity in the physical uplink control channel (PUCCH).
Innovation Solution
The implementation of a method within user equipment (UE) to prioritize and manage multiple CSI reports, using CSI report configuration indices, serving cell indices, and reporting types to determine the highest priority report for transmission, ensuring that only the most critical information is sent on the PUCCH, while dropping less critical reports during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple CSI reports are transmitted simultaneously in the PUCCH, then the quantity of information reported increases, but the payload capacity of the PUCCH is exceeded causing collisions and dropped reports
Solution Approach 1:
The patent segments the multiple CSI reports by assigning different priority levels (first priority, second priority, third priority) based on reporting types and cell indices. This segmentation allows the system to handle multiple reports systematically by processing them in priority order, preventing payload overflow while ensuring critical reports are transmitted reliably.
Solution Approach 2:
The patent changes the parameter of report selection dynamically based on collision detection. When a collision is detected, the system modifies which report is transmitted by comparing priority parameters (reporting types, cell indices) and selecting the highest priority report, thereby adapting to the payload capacity constraint while maintaining reliability.
2Loss of information
If all CSI reports are transmitted without prioritization, then the completeness of information is improved, but the PUCCH payload capacity is exceeded leading to collisions
Solution Approach 1:
The patent applies preliminary action by establishing a clear priority hierarchy before transmission. Reports are pre-categorized into priority levels based on reporting types (e.g., Type 0, Type 1, Type 2, Type 3, Type 4, Type 5, Type 6) and cell indices, so that when collisions occur, the system can immediately identify which reports to transmit without complex real-time decision-making.
Solution Approach 2:
The patent introduces dynamics by making the transmission selection adaptive to collision conditions. The system dynamically determines which report to transmit based on real-time collision detection and priority comparison, allowing the transmission behavior to change flexibly according to the specific collision scenario while following predetermined priority rules.
3Quantity of substance
If the PUCCH payload size is increased to accommodate more CSI reports, then the quantity of transmitted information increases, but the channel capacity and reliability deteriorate
Solution Approach 1:
The patent applies partial action by transmitting only the necessary subset of CSI reports that fit within the PUCCH payload capacity. Instead of attempting to transmit all reports (excessive action), the system selectively transmits reports based on priority, ensuring that the transmitted payload does not exceed channel capacity while still conveying the most critical information reliably.
Data Source
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AI summary
A method for reporting uplink control information (UCI) on a user equipment (UE) is described. Multiple channel state information (CSI) reports are generated for multiple channel state information reference signals (CSI-RS) received on a serving cell. The multiple CSI-RS reports are scheduled to be transmitted in a subframe. An overall highest priority CSI report is determined using a method of prioritization. The overall highest priority CSI report is selected. The overall highest priority CSI report is transmitted.