Wireless UE Bandwidth Adjustment for Interference Management
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Solution Overview
Problem
In wireless communication networks with multiple transmission points, interference between primary and secondary transmission points can disrupt data traffic and communication quality, making it challenging to ensure that secondary points carry the bulk of data traffic while maintaining the benefits of primary point capabilities without compromising communication.
Innovation Solution
Implementing a New Carrier Type (NCT) that reduces the need for UEs to receive CRS from secondary cells, using Scell gaps to manage power imbalance and interference, and adjusting bandwidth to prioritize PCell reception during critical signaling, while employing Scell power reduction and muting to protect PCell signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If secondary transmission points are deployed to carry bulk data traffic, then network capacity and cost efficiency are improved, but interference with primary transmission points increases
Solution Approach 1:
The patent changes the parameter of reference signal transmission by introducing a new carrier type that does not transmit CRS in certain subframes. This parameter change allows secondary cells to operate at higher power levels for data traffic while preventing interference with primary cell measurements, as UEs can be configured to expect no CRS in specific subframes from secondary cells.
Solution Approach 2:
The patent implements periodic action by configuring specific subframes where CRS is muted or reduced in secondary cells. This periodic muting pattern allows primary cell measurements to occur without interference from secondary cells while maintaining continuous data transmission in other subframes, creating a rhythmic interference management scheme.
2Measurement precision
If UEs receive CRS from all cells for measurements, then measurement accuracy is improved, but interference from secondary cells increases
Solution Approach 1:
The patent applies local quality by differentiating the CRS transmission behavior between primary and secondary cells. Primary cells transmit CRS continuously for measurement purposes, while secondary cells mute or reduce CRS in specific subframes. This localized differentiation allows UEs to perform accurate measurements on primary cells without interference from secondary cells.
Solution Approach 2:
The patent introduces configuration signaling as an intermediary mechanism that informs UEs about which cells will transmit CRS and in which subframes. This intermediary information allows UEs to properly distinguish between CRS from primary cells (to be measured) and CRS from secondary cells (to be ignored or used for other purposes).
3Productivity
If power imbalance between primary and secondary cells is increased, then secondary cell data capacity is improved, but signal quality for primary cell reception deteriorates
Solution Approach 1:
The patent implements beforehand cushioning by proactively muting or reducing CRS transmission from secondary cells in subframes where primary cell measurements or critical signaling occurs. This preventive measure cushions against the potential interference that would otherwise result from high power imbalance, ensuring primary cell signal quality is maintained even when secondary cells operate at high power for data capacity.
Data Source
AI summary
Disclosed are methods for allowing a wireless communication device (or “user equipment” or “UE”) to receive signaling information when there is a power imbalance between a primary cell (“Pcell”) and a New Carrier Type (“NCT”) secondary cell (“Scell”). In one aspect, the UE reduces its downlink bandwidth to cover only a carrier of the Pcell, receives control signaling information, if present, and then increases its bandwidth to cover carriers of both the Pcell and Scell.