LTE Uplink Control Information Segmentation for Channel Capacity
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Solution Overview
Problem
In LTE systems, the increasing amount of frequency-selective CQI and PMI information exceeds the limited number of bits available for transmission on the uplink control channel, leading to resource constraints.
Innovation Solution
The solution involves transmitting wideband control information on the control channel and frequency-selective control information on the data channel, with the base station periodically assigning radio resources and requesting the transmission of frequency-selective control information on the data channel, allowing for efficient separation and management of control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If frequency-selective CQI and PMI information is transmitted on the uplink control channel, then channel quality information and precoding matrix information are provided to the base station, but the number of bits exceeds the available transmission limit
Solution Approach 1:
The patent segments control information into two types: wideband control information (transmitted on uplink control channel) and frequency-selective control information (transmitted on uplink data channel). This segmentation allows frequency-selective CQI and PMI information to be transmitted without exceeding the bit limit of the uplink control channel, while still providing complete channel quality and precoding matrix information to the base station.
2Productivity
If frequency-selective control information is transmitted on the uplink control channel, then scheduling and frequency-selective precoding can be performed, but radio resources cannot be efficiently utilized
Solution Approach 1:
The patent moves frequency-selective control information from the uplink control channel to the uplink data channel, utilizing a different transmission dimension. This allows the system to maintain the available bit limit of the control channel while still transmitting frequency-selective CQI and PMI information through the data channel, enabling scheduling and frequency-selective precoding without resource waste.
3Measurement precision
If wideband control information is transmitted on the control channel, then system band channel quality is monitored, but frequency-direction fluctuations are not captured
Solution Approach 1:
The patent segments control information into wideband control information transmitted on the uplink control channel for system band monitoring, and frequency-selective control information transmitted on the uplink data channel for capturing frequency-direction fluctuations. This segmentation ensures both system band CQI measurement and frequency-selective information are captured without exceeding control channel bit limits.
Data Source
AI summary
A user equipment terminal for transmitting control information to a base station according to a single carrier scheme includes a wideband control information generating unit configured to generate wideband control information for a whole system band or a portion thereof; a frequency-selective control information generating unit configured to generate frequency-selective control information; and a control unit configured to control the wideband control information to be transmitted on a control channel or a data channel and control the frequency-selective control information to be transmitted on the data channel.