Uplink Control Information Transmission via HARQ Bit Padding
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Solution Overview
Problem
In LTE wireless communication systems, the limited radio resources for uplink channels lead to potential transmission errors in uplink control information, degrading service quality, particularly when hybrid automatic repeat request (HARQ) ACK/NACK and channel state information (CSI) are transmitted simultaneously.
Innovation Solution
A method and device for transmitting uplink control information by determining simultaneous transmission of HARQ ACK/NACK and CSI, adding additional bits to HARQ ACK/NACK bits corresponding to the number of CSI bits, encoding, modulating, and transmitting these through an uplink control channel, using quadrature phase shift keying (QPSK) modulation, and employing PUCCH format 3 for increased information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If HARQ ACK/NACK and CSI are transmitted simultaneously in the uplink control channel, then the amount of uplink control information is increased, but the transmission error rate increases due to limited radio resources
Solution Approach 1:
The patent segments the uplink control information into different parts: HARQ ACK/NACK bits are separated from CSI bits, and additional dummy bits are inserted into the HARQ ACK/NACK sequence. This segmentation allows the total bit sequence to be divided into information bits and dummy bits, which are then encoded separately using channel coding to improve overall transmission reliability while maintaining increased information capacity.
Solution Approach 2:
The patent changes the parameter of bit sequence length by adding dummy bits to the HARQ ACK/NACK bits. This parameter change increases the total number of bits available for transmission, allowing simultaneous transmission of HARQ ACK/NACK and CSI without exceeding resource limits. The channel coding rate is also adjusted to account for the added bits, optimizing the balance between information capacity and transmission reliability.
2Loss of information
If additional bits are added to HARQ ACK/NACK for simultaneous transmission with CSI, then the information transmission capacity is increased, but the complexity of the transmission protocol increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the structure of the bit sequence before transmission. The format of HARQ ACK/NACK bits, the number and position of dummy bits, and the channel coding scheme are all predetermined. This preliminary structuring simplifies the transmission process by eliminating the need for complex real-time negotiations or dynamic protocol adjustments, reducing overall system complexity while enabling simultaneous transmission of multiple control information types.
Data Source
AI summary
A method of transmitting uplink control information in a wireless communication system is provided. The method may include: determining whether to simultaneously transmit a hybrid automatic repeat request (HARQ) ACK/NACK and channel state information (CSI) from a sub frame; generating an added HARQ ACK/NACK by adding additional bits having a number of bits corresponding to the number of bits of the CSI to the bits of the HARQ ACK/NACK if it is determined that simultaneous transmission is performed; generating an encoded HARQ ACK/NACK by encoding the added HARQ ACK/NACK; generating a plurality of modulation symbols by modulating the encoded HARQ ACK/NACK; and transmitting the plurality of modulation symbols from the sub frame to an uplink control channel.