EPDCCH Edge UE Interference Coordination via ECCE Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-advanced systems, the enhanced physical downlink control channel (EPDCCH) faces challenges with increased demand for control signaling due to heterogeneous networking, leading to bottlenecks in system performance, particularly in inter-cell interference coordination and channel capacity, which are not adequately addressed by existing schemes.
Innovation Solution
A device on the base station side identifies edge user equipment and applies an interference coordination scheme, such as Coordinated Multipoint (CoMP) transmission or Almost Blank Subframe (ABS), to optimize the ECCE aggregation level, reducing interference and improving channel quality, thereby enhancing the EPDCCH's performance and network capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EPDCCH performs frequency division multiplexing with PDSCH to obtain beamforming and diversity gains, then channel capacity and coverage are improved, but control signaling capacity becomes a bottleneck due to increased demand from heterogeneous networking
Solution Approach 1:
The patent segments the EPDCCH into different aggregation levels (AL1, AL2, AL4, AL8, AL16, AL32) based on control signaling requirements. By dividing the control channel into multiple aggregation levels, the system can flexibly allocate resources to meet different signaling capacity demands while maintaining beamforming and diversity gains through frequency division multiplexing with PDSCH.
2Productivity
If ECCE aggregation level is reduced to save EPDCCH space and increase network capacity, then control signaling capacity improves, but blind detection complexity increases
Solution Approach 1:
The patent dynamically adjusts the ECCE aggregation level based on channel quality indicators (CQI) and reference signal receiving power (RSRP) feedback from user equipment. The base station selects appropriate aggregation levels (AL1, AL2, AL4, AL8, AL16, AL32) adaptively, allowing the system to optimize between network capacity and blind detection complexity according to actual channel conditions.
3Ease of manufacture
If existing interference coordination schemes are used on EPDCCH, then implementation simplicity is maintained, but inter-cell interference coordination capability is insufficient in heterogeneous networks
Solution Approach 1:
The patent applies different interference coordination strategies to different EPDCCH aggregation levels and user equipment types. Edge users experience enhanced coordination with coordinated multipoint transmission and almost blank subframes, while central users maintain conventional coordination. This localized quality adjustment improves inter-cell interference coordination capability without overly complicating the overall system implementation.
Data Source
AI summary
A wireless communication system, wireless communication system and method, the device on the base station side in the wireless communication system including: an edge user equipment (UE) identification unit configured to identify the edge UE on the enhanced physical downlink control channel (EPDCCH) according to the information about the UE received from the UE; and an interference coordination unit configured to apply an interference coordination plan to the EPDCCH of the edge UE. Applying the interference coordination plan to the EPDCCH of the edge UE improves service quality of the edge UE; and setting a proper degree of enhanced control channel element aggregation for the edge UE reduces the number of blind tests of the UE, thus increasing the system response speed.