Carrier Indication for Channel State Information Reporting
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Solution Overview
Problem
In LAA-LTE systems, user equipment may not always occupy a channel resource, leading to delayed channel state information reporting to the base station, which hinders timely scheduling decisions.
Innovation Solution
A method and device that send carrier indication information to indicate the carrier resource for transmitting channel state information, allowing user equipment to report channel state information on either a licensed or unlicensed carrier, ensuring timely reporting and scheduling decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user equipment reports channel state information only on unlicensed carriers, then reporting accuracy is improved, but reporting timeliness deteriorates when channel access is lost
Solution Approach 1:
The patent introduces a licensed carrier as an intermediary transmission path for channel state information. When the unlicensed carrier channel is unavailable, the UE can report CSI on the licensed carrier, ensuring timely reporting while maintaining reporting accuracy through the fallback mechanism
2Productivity
If user equipment occupies unlicensed channel resources, then system capacity is improved, but reporting reliability deteriorates due to channel access uncertainty
Solution Approach 1:
The patent prepares a licensed carrier as a backup transmission path in advance. When LBT fails or the unlicensed channel is unavailable, the UE can immediately switch to reporting on the licensed carrier without delay, ensuring reporting reliability while maintaining high system capacity through primary use of unlicensed carriers
3Measurement precision
If the network waits for channel state information before making scheduling decisions, then scheduling accuracy is improved, but scheduling timeliness deteriorates
Solution Approach 1:
The patent establishes a feedback mechanism where the network receives CSI reports on both unlicensed and licensed carriers. The network can make scheduling decisions based on available CSI from either carrier, improving scheduling timeliness while maintaining accuracy through the dual-carrier feedback path
Data Source
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AI summary
Embodiments of the present invention provide a method for transmitting channel state information and a transmission device. The method includes: sending, by a first device, carrier indication information to a second device, where the carrier indication information is used to indicate a carrier resource used when the second device sends channel state information of an unlicensed carrier; and when the carrier resource indicated by the carrier indication information is a licensed carrier, receiving, on the licensed carrier by the first device, the channel state information sent by the second device. In the embodiments of the present invention, the first device indicates, to the second device, the carrier resource used for transmitting the channel state information, so that the second device can send the channel state information of the unlicensed carrier to the first device in time, and the first device can make a corresponding scheduling decision in time according to the channel state information of the unlicensed carrier.