Joint Channel Coding for LTE Control Information Grouping
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Solution Overview
Problem
In LTE systems, the control channel capacity is limited when multiple transmission points share the same cell ID, leading to insufficient control channel resources and restricted system throughput due to the increased number of UEs.
Innovation Solution
Grouping UEs into groups based on similar signal-to-interference noise ratios or geographic locations, performing joint channel coding on the control information for each group, and transmitting the coded information on a data channel, allowing only the corresponding transmission points to receive and transmit the control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple transmission points share the same cell ID to increase network coverage and capacity, then the number of served UEs increases, but the control channel capacity becomes insufficient
Solution Approach 1:
The patent segments control information transmission by introducing two distinct channels: a first control channel for transmission point-specific control information and a second control channel for cell-level control information. This segmentation allows multiple transmission points to share the same cell ID while maintaining adequate control channel capacity by distributing control information across different channels.
2Measurement precision
If control information is transmitted separately for each UE to maintain individualized control, then control accuracy is maintained, but control channel overhead increases significantly
Solution Approach 1:
The patent merges control information for multiple UEs into group-based control messages transmitted through the second control channel. By combining control information at the cell level rather than transmitting separate control messages for each UE, the system maintains necessary control accuracy while significantly reducing control channel overhead and resource consumption.
3Reliability
If all control information is transmitted through the first control channel to ensure transmission point-specific control, then control reliability is maintained, but the control channel capacity is exceeded
Solution Approach 1:
The patent segments control information into two categories: transmission point-specific control information sent through the first control channel and cell-level control information sent through the second control channel. This segmentation prevents any single channel from being overloaded, maintaining both reliability and efficient capacity utilization.
4Adaptability or versatility
If separate control channels are created for each transmission point to maintain independent control, then transmission point control independence is achieved, but system complexity increases
Solution Approach 1:
The patent implements a universal second control channel that serves multiple transmission points simultaneously, eliminating the need for separate dedicated control channels for each transmission point. This multi-functional approach maintains transmission point control independence through the first control channel while using the second control channel for common cell-level information, thereby reducing overall system complexity.
Data Source
AI summary
A method and an apparatus for transmitting control information are disclosed. The method includes: grouping UEs in a cell, and obtaining second control information of each UE group after grouping; performing joint channel coding on the second control information of each UE group; obtaining first control information, and transmitting the first control information to the UEs in the cell, where the first control information includes indication information of the second control information, on which joint channel coding has been performed, of each UE group, so as to obtain the second control information according to the indication information; and transmitting the second control information, on which joint channel coding has been performed, of each UE group to the UEs in the cell.