Uplink Control Information Channel Coding for LTE-Advanced
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Solution Overview
Problem
Conventional techniques for LTE-Advanced do not effectively address channel coding for increased Uplink Control Information (UCI) on the Physical Uplink Shared Channel (PUSCH), particularly in scenarios with multiple uplink transmit antennas, leading to inefficiencies in transmission control and scheduling between base stations and user equipment.
Innovation Solution
A method where user equipment determines the number of coded symbols for channel state information by concatenating bits and attaching Cyclic Redundancy Check (CRC) bits for each downlink component carrier, enabling efficient channel coding and transmission of UCI via PUSCH, even with multiple configured component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and higher order MIMO are adopted to increase transmission bandwidth and data rate, then the transmission capacity and speed are improved, but the size of Uplink Control Information (UCI) increases rapidly leading to channel coding inefficiency
Solution Approach 1:
The patent segments the channel coding process into separate paths: one for UCI and another for data on PUSCH. By dividing the coding resources and applying different coding schemes to control information and data separately, the system efficiently handles the increased UCI size without compromising overall transmission capacity.
Solution Approach 2:
The patent introduces a new dimension in resource allocation by allocating specific resource elements for UCI transmission on PUSCH. This dimensional separation in the time-frequency resource grid allows independent optimization of UCI channel coding while maintaining data transmission efficiency.
2Productivity
If multiple transmission antennas are used for uplink transmission with DFT-precoded OFDM, then the spectral efficiency is improved, but the channel coding for UCI on PUSCH becomes inefficient
Solution Approach 1:
The patent applies local quality by using different channel coding schemes for different parts of the transmission: UCI receives dedicated coding protection while data uses adaptive coding. This localized optimization ensures reliable control information transmission while maintaining high spectral efficiency through multiple antennas.
Solution Approach 2:
The patent changes coding parameters specifically for UCI on PUSCH by introducing separate coding rate and redundancy parameters. This allows the system to optimize error protection for control information independently from data transmission, even in multi-antenna DFT-precoded OFDM scenarios.
3Productivity
If UCI is multiplexed with data on PUSCH, then the resource utilization is improved, but the scheduling and channel coding procedures become more complex
Solution Approach 1:
The patent performs preliminary action by pre-defining resource element allocations and coding parameters for UCI before the actual transmission. This advance preparation simplifies the scheduling process by establishing clear rules for resource division between UCI and data, reducing real-time scheduling complexity.
Solution Approach 2:
The patent creates a universal channel coding framework that handles both UCI and data transmission through a unified PUSCH structure. This multi-functional approach allows the same physical channel to efficiently carry both control and data information with standardized procedures.
Data Source
AI summary
A user equipment for performing effective coding scheme of uplink control information transmission is provided. The user equipment transmits, to a base station apparatus, channel state information for multiple downlink component carriers, the user equipment comprising: a determining unit for determining, the number of coded symbol for the channel state information for multiple downlink component carriers, using the number of bits, which is obtained by concatenating channel state information bits for each downlink component carrier and attaching Cyclic Redundancy Check (CRC) bits to the concatenated channel state information bits for each downlink component carrier.