PDCCH Coding Rate Adaptation for LTE Capacity
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Solution Overview
Problem
The PDCCH channel capacity becomes a bottleneck in LTE systems as connected UE capacity increases, due to limited resources and the need to schedule both user data and control information, leading to congestion and reduced performance.
Innovation Solution
Dynamic adaptation of control channel coding rates based on measured radio frequency conditions of multiple user equipment within a cell, determining a minimum coding rate for control channels and applying it to all user equipment to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of connected UEs is increased to meet high capacity demands, then the PDCCH capacity is exceeded and performance degrades
Solution Approach 1:
The patent implements dynamic adaptation of control channel coding rates based on measured radio frequency conditions. The system continuously monitors RF conditions and adjusts the minimum control channel coding rate accordingly, transforming the static PDCCH resource allocation into a dynamic system that can adapt to changing channel conditions, thereby supporting more connected UEs without degrading PDCCH reliability
Solution Approach 2:
The patent changes the coding rate parameter of the control channel based on measured RF conditions. By adjusting the minimum control channel coding rate dynamically, the system optimizes the trade-off between PDCCH capacity and transmission reliability, enabling support for higher connected UE capacity while maintaining acceptable performance levels
2Reliability
If more CCEs are used for PDCCH to improve transmission reliability, then the PDCCH capacity is consumed faster
Solution Approach 1:
The patent dynamically adjusts the minimum control channel coding rate parameter based on measured RF conditions. When RF conditions are good, a lower coding rate (fewer CCEs) can be used; when conditions deteriorate, the coding rate is increased. This parameter adaptation resolves the contradiction by optimizing CCE usage based on actual channel conditions rather than using fixed conservative values
Solution Approach 2:
The system transforms the static allocation of CCEs into a dynamic resource allocation mechanism. The minimum control channel coding rate is continuously adapted based on RF condition measurements, allowing the system to use fewer CCEs when conditions permit while maintaining reliability when needed, thus optimizing overall PDCCH capacity utilization
3Reliability
If conservative coding rates are used for all UEs without RF condition knowledge, then transmission reliability is maintained but PDCCH capacity is wasted
Solution Approach 1:
The patent implements a feedback mechanism where the system measures RF conditions of UEs and uses this information to adaptively determine the minimum control channel coding rate. This feedback loop replaces the conservative one-size-fits-all approach with an intelligent system that adjusts coding rates based on actual channel conditions, improving PDCCH resource efficiency while maintaining reliability
Solution Approach 2:
The system changes the coding rate parameter from a fixed conservative value to a dynamically adjusted value based on measured RF conditions. This parameter adaptation allows the system to use appropriate coding rates for different channel conditions, resolving the contradiction between maintaining reliability and improving resource efficiency
Data Source
AI summary
In a cell where messages having a message type are sent without knowledge of radio frequency conditions for individual ones of user equipment within the cell, measured radio frequency conditions are accessed of multiple user equipment within the cell. Based on the measured radio frequency conditions, a minimum control channel coding rate is determined for a control channel for messages having the message type. Subsequent to a determination of the minimum control channel coding rate, transmission is caused toward all user equipment in the cell of the messages having the message type using the determined minimum control channel coding rate for the control channel. Methods, apparatus, computer programs, and program products are disclosed. The methods may be performed by a base station, self-organizing network server, or other apparatus.