Uplink Control Information Encoding for LTE-A TDD Systems
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Solution Overview
Problem
In LTE and LTE-A TDD systems, the number of bits occupied by Uplink Control Information (UCI) often exceeds the maximum number of bits supported by the Reed Muller (32, O) code, posing a challenge in efficient transmission and reception.
Innovation Solution
The method involves dividing the UCI information bit sequence into two parts, encoding each part using Reed Muller (32, O) code, removing the last 8 bits to obtain 24-bit coded sequences, and performing rate matching to generate a 48-bit coded sequence, which is then transmitted, allowing for effective transmission even when the number of bits exceeds the Reed Muller code's capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of downlink subframes is increased to enhance data transmission capacity, then the downlink throughput is improved, but the number of UCI bits to be fed back exceeds the maximum capacity of RM (32, O) code
Solution Approach 1:
The UCI bit sequence is divided into two parts: first UCI bits and second UCI bits. Each part is independently encoded using RM (32, O) code, allowing the system to handle more total UCI bits than the original single-code limitation by distributing them across multiple encoded segments.
Solution Approach 2:
The patent transitions from a single-dimension encoding approach (one RM code for all UCI bits) to a two-dimension approach by creating separate encoded sequences for first UCI bits and second UCI bits, then combining them through rate matching to achieve higher overall capacity.
2Productivity
If carrier aggregation is introduced to increase system capacity, then the data transmission capability is enhanced, but the number of UCI bits from multiple component carriers exceeds the RM (32, O) code support limit
Solution Approach 1:
UCI bits from multiple component carriers are segmented into first UCI bits and second UCI bits, each undergoing separate RM (32, O) encoding. This segmentation enables the system to aggregate UCI from multiple carriers without exceeding the encoding capacity of a single code instance.
Solution Approach 2:
After separate encoding of first and second UCI bits, the patent merges the encoded sequences through rate matching to generate a combined coded sequence that carries information from multiple component carriers, effectively aggregating capacity while maintaining encoding constraints.
3Device complexity
If all UCI bits are encoded using a single RM (32, O) code, then the encoding process is simple, but the maximum number of supported bits is limited to 11 bits
Solution Approach 1:
The UCI bit sequence is segmented into two separate sequences that are independently encoded. This maintains the simplicity of using standard RM (32, O) code for each segment while effectively doubling the capacity to handle more than 11 bits of UCI information through the combination of both encoded sequences.
4Quantity of substance
If the number of coded bits is increased to accommodate more UCI information, then the information capacity is improved, but the coding gain per bit decreases
Solution Approach 1:
By dividing UCI bits into two separately encoded segments, each segment maintains a manageable size that preserves coding gain. The first UCI bits and second UCI bits are each encoded with RM (32, O) code, ensuring sufficient coding gain for each segment while the combined capacity exceeds the original 11-bit limitation.
Solution Approach 2:
The patent changes the parameter of coded bit sequence length by creating two separate encoded sequences and combining them through rate matching. This allows the system to achieve higher total information capacity while maintaining appropriate coding gain through the structured combination of two optimized segments.
Data Source
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AI summary
A method for transmitting and receiving Uplink Control Information (UCI), a terminal, and a base station are provided. The transmitting method includes: calculating the number (Q') of modulation symbols occupied by the UCI to be transmitted; dividing the information bit sequence of the UCI to be transmitted into two parts; using Reed Muller (RM) (32, 0) codes to encode each part of information bit sequence of the UCI to be transmitted to obtain a 32-bit coded bit sequence respectively, and performing rate matching so that the rate of the first 32-bit coded bit sequence is ┌Q/2┐×Qm bits and that the rate of the second 32-bit coded bit sequence is (Q-┌Q/2┐)×Qm bits; and mapping the two parts of coded bit sequences that have undergone rate matching onto a Public Uplink Shared Channel (PUSCH), and transmitting the coded bit sequences to a base station.