MIMO Control Information Scheduling via PUCCH and PUSCH
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Solution Overview
Problem
In next-generation mobile communication systems, there is a challenge in efficiently transmitting control information such as channel quality indicators (CQI), precoding matrix indices (PMI), and rank information (RI) between user equipment (UE) and eNode B, especially in multi-cell environments where channel information feedback is crucial for adaptive transmission but is hindered by limited resource allocation and timing variations.
Innovation Solution
A method for effectively scheduling the transmission of control information, including PMI/CQI, RI, and acknowledgement/negative acknowledgement (ACK)/NAK, through the physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) using a closed-loop or open-loop spatial multiplexing scheme, where specific bit allocations are made based on the number of transmit antennas and transmission ranks to optimize reporting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control information (CQI, PMI, RI) is transmitted frequently to improve channel feedback accuracy, then measurement precision improves, but transmission resource consumption increases
Solution Approach 1:
The patent segments control information into different types (wideband CQI/PMI, subband CQI, RI, ACK/NACK) and transmits them through different channels (PUCCH or PUSCH) based on their importance and timing requirements. This segmentation allows efficient resource allocation where critical feedback like RI uses dedicated resources while less critical information shares resources, resolving the contradiction between feedback accuracy and resource consumption.
Solution Approach 2:
The patent implements periodic transmission of control information with different periods for different types of feedback. Wideband CQI/PMI and RI are transmitted periodically with configured periods, while aperiodic feedback is triggered by specific events. This periodic structure ensures timely feedback without continuous resource consumption, balancing accuracy requirements with resource efficiency.
2Productivity
If multiple types of control information are transmitted simultaneously to improve system capabilities, then system capacity improves, but transmission complexity increases
Solution Approach 1:
The patent merges multiple types of control information (CQI, PMI, RI, ACK/NACK) into unified transmission structures. When PUSCH is available, all control information is multiplexed together in a single transmission. When only PUCCH is available, different types are systematically multiplexed with defined priorities. This merging reduces the number of separate transmission operations and simplifies the overall transmission process while maintaining full system capacity.
Solution Approach 2:
The patent implements a structured feedback mechanism where the eNodeB configures the UE with specific reporting modes and periods for different control information types. The UE follows these configurations to transmit appropriate feedback, and the eNodeB uses this feedback to adaptively adjust transmission parameters. This closed-loop feedback system manages complexity by providing clear transmission rules while enabling sophisticated MIMO operations.
3Speed
If control information is transmitted on PUCCH to ensure timely feedback, then transmission speed improves, but information loss increases due to channel limitations
Solution Approach 1:
The patent uses the PUSCH as an intermediary channel when available to transmit control information, leveraging its larger capacity to avoid information loss. When PUSCH is not available, PUCCH serves as the intermediary with optimized multiplexing schemes. The system dynamically selects between these intermediary channels based on availability, ensuring timely feedback while minimizing information loss through appropriate channel selection and multiplexing.
Data Source
AI summary
A method for transmitting a plurality of control information through a PUCCH or a PUSCH is disclosed. The method includes transmitting first control information, and transmitting second control information. The transmission of the first control information and the transmission of the second control information are performed in units of one subframe and are performed once per predetermined period, respectively. In a subframe in which the transmission of the second control information is to be simultaneously performed with the transmission of the first control information, the second control information is excluded for transmission or the first and the second information are simultaneously transmitted, according to the configuration of a closed-loop system or an open-loop system.