Uplink Subframe Allocation in Dual Connectivity
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Solution Overview
Problem
In wireless communication systems, particularly in dual connectivity mode, there is a challenge in efficiently handling single uplink transmissions due to collisions between LTE and NR uplink communications, leading to performance degradation and interference in both LTE and NR networks.
Innovation Solution
The method involves determining whether an uplink communication is dynamically scheduled or semi-statically configured, and using a downlink-reference uplink-downlink configuration to identify suitable subframes for transmission, allowing flexible and efficient transmission of uplink communications by prioritizing either LTE or NR based on the configuration, thereby avoiding collisions and optimizing network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE and NR uplink communications are transmitted simultaneously in dual connectivity mode, then communication capacity is increased, but collisions occur leading to performance degradation and interference
Solution Approach 1:
The patent segments the uplink transmission resources by dividing them into LTE-specific uplink subframes and NR-specific uplink subframes based on the downlink-reference uplink-downlink configuration. This segmentation prevents collisions between LTE and NR uplink communications while maintaining dual connectivity operation, thereby preserving communication capacity without suffering from performance degradation due to collisions.
2Productivity
If flexible scheduling is implemented for uplink communications, then spectral efficiency is improved, but complexity in managing LTE and NR transmissions increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the uplink-downlink configuration before scheduling uplink communications. The downlink-reference uplink-downlink configuration is established in advance, which defines the LTE-specific and NR-specific uplink subframes. This preliminary configuration simplifies the scheduling process by providing a clear framework for allocating uplink resources, thereby maintaining spectral efficiency while reducing the complexity of managing LTE and NR transmissions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether an uplink communication for a first radio access technology (RAT) has been dynamically scheduled or semi-statically configured, wherein the UE is in a dual connectivity mode using the first RAT and a second RAT. The UE may identify an uplink subframe for transmission of the uplink communication based at least in part on whether the uplink communication has been dynamically scheduled or semi-statically configured, and based at least in part on a downlink-reference uplink-downlink configuration. The UE may transmit the uplink communication in the identified uplink subframe. Numerous other aspects are provided.