SU-MIMO PUCCH Index Allocation for Control Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3GPP LTE standards do not effectively support the simultaneous transmission of multiple PUCCH resources for ACK/NACK signals, limiting the efficiency of SU-MIMO in high-data-rate communication systems.
Innovation Solution
The method involves user equipment utilizing single-user multiple input multiple output (SU-MIMO) transmission by reserving control channel elements for control signals, where available indexes are used to transmit control information, with the lowest downlink channel index used for initial transmission and an additional predetermined index used if available, or adjusting transmission properties if only one index is available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PUCCH resources are allocated for SU-MIMO control information transmission, then control information transmission capability is improved, but PUCCH overhead and resource consumption increase
Solution Approach 1:
The patent applies multi-functionality by enabling a single PUCCH resource to carry multiple control information types (ACK/NACK for different transport blocks, CQI, and scheduling requests) through codebook-based multiplexing. The codebook structure allows different control information elements to be combined and transmitted together on one PUCCH resource, making the PUCCH channel universally capable of handling various uplink control signals without requiring separate dedicated resources for each control information type.
Solution Approach 2:
The patent merges multiple control information transmissions into a single PUCCH resource by combining ACK/NACK responses for multiple transport blocks, channel quality indicators, and scheduling requests into one unified uplink control message. This combining is achieved through codebook construction where different control information elements are packed together, reducing the number of separate PUCCH transmissions needed and thereby reducing overall PUCCH overhead.
2Productivity
If SU-MIMO transmission is implemented to support higher data rates, then data rate capability is improved, but control signalling requirements and complexity increase
Solution Approach 1:
The patent segments the control information into distinct codebook entries corresponding to different transport blocks and control signal types. Each transport block receives its own ACK/NACK bit in the codebook, and different control information elements (CQI, scheduling requests) are segmented into specific codebook positions. This segmentation allows the system to handle SU-MIMO's multiple transport blocks systematically while maintaining organized control signalling structure.
Solution Approach 2:
The patent changes the parameter representation of control information by using codebook indices and bit positions to encode control signals. Instead of transmitting separate control messages for each transport block, the system uses parameter changes in the codebook structure (bit positions, codebook size, index values) to represent multiple control information elements compactly. This parameter-based encoding reduces control signalling complexity while supporting SU-MIMO's higher data rate requirements.
Data Source
AI summary
Apparatus and method for communication are provided. An apparatus includes a receiver configured to receive control and data signal; a transmitter configured to transmit control information on an uplink channel wherein a number of uplink control channel indexes corresponding to the number of control channel elements as on the downlink control channel is available, the transmission requiring more than one uplink channel index; and a controller. If one control channel index is available, the controller is configured to control the transmission of control information to utilise the uplink control channel index and control the transmission of control information related to a second control channel index based on a separate channel or adjusting transmission properties when transmitting the control information.