TDM Coordination for LTE-NR Carrier Aggregation
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Solution Overview
Problem
The increasing demand for mobile broadband access highlights the need for improved techniques in New Radio (NR) and Long Term Evolution (LTE) technologies, particularly in coordinating time division multiplexing (TDM) for multiple radio access technologies (RAT) carrier aggregation, such as LTE-NR carrier aggregation, to mitigate interference and enhance communication efficiency.
Innovation Solution
A method for wireless communication that involves generating and exchanging resource coordination information between base stations using different radio access technologies (RATs), specifically through the use of resource coordination bitmaps indicating shortened transmission time intervals (sTTIs), to coordinate resource utilization in the time and frequency domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time division multiplexing (TDM) is used for multiple RAT carrier aggregation, then communication efficiency is improved, but interference between base stations increases
Solution Approach 1:
The patent applies preliminary action by having base stations exchange resource coordination information before actual transmission occurs. The first base station generates resource coordination information indicating sTTIs assigned to the first RAT, transmits this to the second base station, and receives acknowledgment with modified bitmaps indicating additional sTTIs assigned to the second RAT. This pre-coordination mechanism allows the system to resolve interference issues before they occur, enabling efficient TDM while mitigating harmful interference effects.
2Object-affected harmful factors
If resource coordination information is exchanged between base stations, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent employs an intermediary approach by introducing resource coordination information as a mediating mechanism between base stations. The first base station generates resource coordination information containing bitmaps that serve as an intermediary data structure to communicate resource allocation intentions to the second base station. This intermediary mechanism simplifies the coordination process by providing a standardized format for exchanging timing and resource information, thereby reducing interference without excessive system complexity.
3Speed
If shortened transmission time intervals (sTTI) are used, then transmission speed is improved, but coordination difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the transmission time interval into multiple shortened transmission time intervals (sTTIs). The resource coordination information includes bitmaps that indicate which specific sTTIs within a TTI are assigned to each RAT. This segmentation allows the system to maintain high transmission speeds through shorter intervals while managing coordination complexity by providing granular, discrete time slot assignments that are easier to schedule and coordinate between multiple base stations.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for multiple radio access technology (RAT) carrier aggregation (CA), such as Long Term Evolution (LTE)-New Radio (NR) CA. The method, in one example, comprises generating a first resource coordination information (RCI) comprising one or more resource coordination bitmaps indicating one or more shortened transmission time intervals (sTTIs) of a TTI assigned to the first RAT for communication, wherein the TTI comprises a plurality of sTTIs. The method further comprises transmitting a message including the first RCI to a second base station that uses a second RAT. The method further comprises receiving an acknowledgement of the message from the second base station, the acknowledgment including a second RCI comprising one or more modified resource coordination bitmaps indicating the one or more sTTIs assigned to the first RAT for communication and one or more additional sTTIs of the TTI assigned to the second RAT.