UCI Transmission for High Carrier Frequencies
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Solution Overview
Problem
In wireless communications, particularly in 5G and future 6G systems operating at carrier frequencies above 52.6 GHz, there is a challenge in maintaining adequate uplink coverage for UCI transmission due to larger path-loss and low transmit power at user equipment, which affects the quality of service and requires improved transmission schemes for both initial and retransmission of data channels.
Innovation Solution
The implementation of a multiple port transmission scheme for UCI, using separate coding and scrambling for each port, along with block-wised orthogonal cover code and shared DMRS for modulation and power management, to enhance coverage and phase continuity between initial and retransmission of data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier frequency is increased above 52.6 GHz to enable 5G/6G wireless communication, then data transmission capacity is improved, but path-loss increases and uplink coverage deteriorates
Solution Approach 1:
The patent segments the uplink transmission into multiple slots, separating initial transmission from retransmission. This allows different modulation orders and power levels to be applied to different segments, optimizing both capacity and coverage. The segmentation enables the system to achieve high data rates when conditions permit while ensuring reliable delivery through dedicated retransmission resources.
Solution Approach 2:
The patent implements dynamic modulation order adjustment between initial transmission and retransmission. The modulation order can be changed based on channel conditions, allowing the system to adapt to varying path-loss conditions. This dynamic approach enables the system to maintain high productivity when channel conditions are good while ensuring reliability when conditions deteriorate.
2Power
If transmit power is reduced at user equipment to manage interference and heat, then device complexity and energy consumption are reduced, but uplink coverage and signal quality deteriorate
Solution Approach 1:
The patent applies preliminary action by allocating dedicated retransmission resources in advance. The network pre-configures retransmission slots and power levels before actual transmission occurs. This allows the system to plan power usage strategically, using lower power for initial transmission when possible, and having pre-arranged resources available if retransmission is needed, thereby maintaining signal quality without requiring continuously high power.
Solution Approach 2:
The patent changes key transmission parameters including modulation order and power level between initial transmission and retransmission. By allowing these parameters to vary dynamically, the system can reduce transmit power when initial transmission succeeds, improving energy efficiency and reducing interference, while maintaining signal quality through parameter optimization during retransmission if needed.
3Reliability
If separate coding and scrambling are applied for each port in multiple port transmission, then transmit diversity and coverage are improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission process into distinct phases (initial transmission and retransmission) with separate coding and scrambling applied to each phase. This segmentation allows the system to implement complex diversity schemes without overwhelming the device, as the complexity is distributed across time slots rather than requiring simultaneous processing of all diversity mechanisms.
Solution Approach 2:
The patent merges multiple transmission techniques including multiple port transmission, separate coding, scrambling, and phase continuity mechanisms into a unified transmission framework. By combining these techniques systematically, the patent achieves improved coverage through transmit diversity while managing device complexity through integrated design that coordinates all elements working together rather than as separate independent functions.
Data Source
AI summary
Various embodiments herein provide techniques related to transmission and retransmission of data in systems that are operating with carrier frequencies above approximately 52.6 gigahertz (GHz). Some embodiments herein may refer to an enhanced transmission scheme for UCI. Some embodiments may additionally or alternatively relate to mixed initial transmission and retransmission of data channels for higher carrier frequencies. Other embodiments may be described and/or claimed.