Massive MIMO Interference Suppression via Orthogonal Port Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication methods between base stations and user equipment face challenges in reliable channel estimation due to high inter-cell interference, which affects the Signal to Interference plus Noise Ratio (SINR) and data decoding reliability.
Innovation Solution
A novel port signaling method is introduced, where distinct base stations signal distinct reference signal (RS) ports to users scheduled in those respective base stations, ensuring orthogonality between RS ports to reduce the number of active interferers and enhance SINR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power control is used to suppress inter-cell interference, then interference levels are reduced, but the performance is limited by the number of interferers
Solution Approach 1:
The patent segments the reference signal resources by assigning different orthogonal RS ports to different base stations. This segmentation allows the system to distinguish between signals from different base stations, effectively reducing inter-cell interference without being limited by traditional power control methods.
Solution Approach 2:
The patent introduces a new dimension for interference management by using orthogonal RS ports instead of relying solely on power control. By assigning RS ports from different dimensions (orthogonal ports), the system can suppress interference from multiple interferers simultaneously, overcoming the limitation of traditional methods that work in a single dimension.
2Object-affected harmful factors
If Interference Rejection Combiner (IRC) is used at receiver, then interference suppression is achieved, but performance is still limited by the number of interferers
Solution Approach 1:
The patent applies preliminary action by assigning orthogonal RS ports to different base stations before the actual data transmission occurs. This pre-configuration of orthogonal ports enables the receiver to distinguish and separate signals from different base stations more effectively, enhancing interference suppression capabilities beyond what IRC alone can achieve.
3Object-affected harmful factors
If specific beamforming is used by exploiting multiple antennas, then interference suppression is improved, but performance is limited by the number of interferers
Solution Approach 1:
The patent merges the advantages of orthogonal RS port assignment with beamforming techniques. By combining orthogonal port signaling with multi-antenna beamforming, the system achieves enhanced interference suppression that overcomes the limitations of using either technique alone, allowing effective handling of multiple interferers.
4Measurement precision
If orthogonal RS ports are assigned to users scheduled in distinct BSs, then the number of active interferers is reduced and SINR is increased, but device complexity increases
Solution Approach 1:
The patent changes the parameter of RS port assignment from traditional continuous indexing to orthogonal port assignment based on base station identity. This parameter change enables the system to reduce the number of active interferers and improve SINR, while the complexity is managed through systematic port allocation rules.
Data Source
AI summary
Embodiments of the present disclosure relate to a base station and method for communication in a communication network. The method comprising signalling a DMRS-configuration or SRS-configuration to at least one UE. The DMRS-configuration comprises signalling at least one antenna port number from multiple antenna port numbers, each antenna port number indicates location of occupied subcarriers and null subcarriers associated with a DMRS transmission of the at least one UE. The SRS-configuration comprises signalling of parameters associated with a time, a frequency and a code. The method also comprises receiving a data and DMRS signals, or SRS signals corresponding to the at least one UE. Further, grouping a subset of the signals corresponding to a subset of antennas to generate a plurality of signal groups. Next, performing first stage filtering at RU followed by second stage filtering at DU of the signals associated with each signal groups to obtain filtered signals.