Grouping Mobile Terminals for LTE Control Channel Allocation
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Solution Overview
Problem
In LTE communications systems, the existing methods for managing downlink control channels result in increased processing load and power consumption for mobile terminals due to excessive blind detection of control channels, insufficient capacity for L1/L2 control information transmission, and inefficient use of radio resources, leading to delays and reduced data throughput.
Innovation Solution
A communications method that groups mobile terminals based on attribution information and allocates L1/L2 control signals to specific control channel elements, allowing for blind detection of a reduced candidate set, thereby reducing processing load and power consumption, and optimizing the use of radio resources by using OFDM and SC-FDMA access methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile terminals perform blind detection on all candidate control channels, then control information can be reliably received, but processing load and power consumption increase significantly
Solution Approach 1:
The patent segments the control channel candidates into multiple groups based on CCE index ranges. Each mobile terminal is assigned to monitor only specific groups rather than all candidates, dividing the blind detection task into manageable segments that reduce processing load while maintaining reliable control information reception through targeted monitoring.
Solution Approach 2:
The patent applies local quality by making different mobile terminals monitor different groups of control channel candidates based on their specific needs and assignments. This localized approach allows each terminal to optimize its detection efforts for relevant candidates only, reducing overall system power consumption while maintaining individual terminal reliability.
2Productivity
If the number of control channel candidates is increased to accommodate more mobile terminals, then more terminals can be served, but processing delays increase
Solution Approach 1:
The patent segments control channel candidates into multiple groups that can be processed in parallel. By organizing candidates into distinct groups with specific CCE index ranges, the system can serve multiple mobile terminals simultaneously through parallel processing of different groups, increasing productivity without proportionally increasing processing delays.
3Quantity of substance
If all control channel elements are used for L1/L2 control information transmission, then transmission capacity is maximized, but radio resource efficiency decreases
Solution Approach 1:
The patent segments control channel elements into multiple groups based on CCE index ranges and assigns different groups to different mobile terminals. This segmentation allows the system to maintain adequate transmission capacity for each terminal while improving overall radio resource efficiency through organized, targeted allocation rather than uniform distribution across all elements.
Solution Approach 2:
The patent applies local quality by assigning different CCE groups to different mobile terminals based on their specific requirements. This localized allocation optimizes the match between control information transmission needs and radio resource availability, improving efficiency while maintaining sufficient capacity for each terminal.
Data Source
AI summary
A mobile terminal monitors a candidate set (Candidate Set) of L1/L2 control information. However, when a base station carries out signaling of a candidate set to each of all mobile terminals, the load on the base station from the viewpoint of radio resources becomes large. Furthermore, the amount of processing in performing a blind detection of each mobile terminal also increases.Therefore, the base station carries out a process of performing grouping of the above-mentioned mobile terminal which is a destination of transmission of the above-mentioned L1/L2 control signal, a process of allocating an L1/L2 control signal to be transmitted to a predetermined mobile terminal to the control channel elements included in a group to which the predetermined mobile terminal is belonging on the basis of attribution information about the mobile terminal. The mobile terminal receives a downlink physical control channel, and also performs a blind detection process on the candidate set corresponding to the group to which the mobile terminal is belonging and performs a process of reading the L1/L2 control signal from the control channel elements included in the candidate set.