Uplink Control Information Transmission in Unlicensed Bands
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Solution Overview
Problem
There is a need for a method and apparatus to efficiently transmit uplink control information in mobile communication systems operating in unlicensed bands or requiring channel sensing.
Innovation Solution
The method involves configuring serving cells in a mobile communication system to determine whether to transmit uplink control information through an uplink data channel, and receiving this information in licensed or unlicensed bands based on the configuration, with specific rules for idle or occupied states of the unlicensed band cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink control information is transmitted through uplink data channel in unlicensed band, then transmission efficiency is improved, but terminal complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission parameters based on channel conditions. The network configures the terminal with parameters indicating whether simultaneous PUCCH and PUSCH transmission is enabled, and the terminal adjusts its transmission behavior accordingly. This allows efficient adaptation to unlicensed band conditions without permanently increasing terminal complexity.
Solution Approach 2:
The patent implements dynamics by making the transmission mode flexible and configurable rather than fixed. The network can dynamically enable or disable simultaneous PUCCH and PUSCH transmission based on channel sensing results and traffic conditions, allowing the system to adapt to changing environmental conditions in unlicensed bands.
2Reliability
If channel sensing is performed in unlicensed band, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by performing channel sensing before actual data transmission. The network performs LBT (Listen-Before-Talk) procedure in advance to check if the unlicensed channel is available, and only then proceeds with transmission. This preliminary check ensures reliable transmission by avoiding collisions while the timing is optimized to minimize delay.
Solution Approach 2:
The system implements self-service through autonomous channel access management. The terminal independently performs channel sensing and determines whether to transmit based on channel availability, without requiring continuous network control. This autonomous operation reduces overhead and minimizes transmission delay while ensuring reliable access to unlicensed spectrum.
Data Source
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AI summary
A communication technique for combining a 5G communication system for supporting a higher data rate after 4G system with IoT technology includes transmitting configuration information of one or more serving cells that operate in an unlicensed band to a terminal, transmitting information indicating that an uplink control channel and an uplink data channel can be simultaneously transmitted to the terminal, determining whether the terminal is configured to transmit at least one of data and the uplink control information through the uplink data channel in at least one of a licensed band and the unlicensed band, and receiving the uplink control information in at least one of the licensed band and the unlicensed band on the basis of the determination, wherein the configuration information includes unlicensed-band uplink control channel configuration information for configuring the uplink control channel in one of the serving cells that operate in the unlicensed band.