Uplink Control Information Carrier Selection in TDD Systems
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently transmitting uplink control information (UCI) in narrowband systems, particularly in time division duplex (TDD) frequency bands, which affects uplink data rates and resource utilization.
Innovation Solution
The method involves determining at least two carriers for uplink transmission by a user equipment (UE) and selecting a specific carrier for UCI transmission. The UE then determines the relative frequency-domain position and time-domain starting position for UCI transmission on this carrier, allowing for efficient UCI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are used for uplink transmission, then uplink data rate is improved, but device complexity increases due to frequency retuning requirements
Solution Approach 1:
The patent segments the uplink transmission by dividing it into data transmission on one carrier and control information transmission on another carrier. This allows the UE to handle multiple carriers independently, with the frequency retuning specifically triggered only when control information needs to be transmitted, thus managing complexity through functional segmentation
Solution Approach 2:
The patent implements dynamic frequency retuning where the UE adjusts its center frequency based on real-time needs. The retuning is dynamically triggered when control information transmission is required on a different carrier, allowing the system to adapt between single-carrier and multi-carrier operation modes as needed
2Quantity of substance
If control information is transmitted on a separate carrier, then resource utilization is improved, but time delay increases due to frequency switching
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple carriers for the UE before actual transmission begins. The network configures at least two carriers in advance, so when control information needs to be transmitted, the UE can immediately switch to the pre-configured carrier without needing to search or establish new resources, reducing the effective time penalty
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method performed by a user equipment (UE) is provided that includes receiving, via a RRC signaling, SIB for two uplink carriers in one cell, the two uplink carriers including a first uplink carrier corresponding to a downlink carrier in which a downlink synchronization signal is received and a second uplink carrier, transmitting an uplink signal on one of the two uplink carriers configured to the UE.