Uplink Multipoint Transmission With Dynamic Destination Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in coordinating multipoint transmissions, particularly in managing uplink channels and interference in LTE networks, especially in scenarios with multiple destination points and varying bandwidth allocations, leading to issues with connectivity and interference management.
Innovation Solution
The proposed solution involves enhancing wireless transmit/receive units (WTRUs) with dynamic destination point selection, improved power control mechanisms, and advanced resource allocation strategies, including cyclic shift hopping, power headroom reporting, and enhanced physical uplink channel management to optimize multipoint transmission in LTE systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple destination points are used for uplink transmission, then connectivity and coverage are improved, but interference management and coordination complexity increase
Solution Approach 1:
The patent segments the uplink transmission by introducing separate uplink transmission contexts (UTCs) for different destination points. Each UTC is independently configured and managed, allowing the system to handle multiple destination points without increasing overall coordination complexity. The WTRU selects appropriate UTCs based on the intended destination, effectively dividing the complex multipoint problem into manageable independent transmission contexts.
2Productivity
If dynamic destination point selection is implemented, then transmission efficiency is improved, but power control and resource allocation complexity increase
Solution Approach 1:
The patent implements dynamic destination point selection through dynamic UTC selection. The WTRU can switch between different UTCs based on current transmission conditions, destination requirements, and channel state. Each UTC contains destination-specific parameters including power control settings, allowing the system to adapt transmission parameters dynamically without requiring complex centralized coordination for every transmission decision.
3Object-affected harmful factors
If multiple uplink transmission contexts are configured, then interference management is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent creates universal UTC configurations that can serve multiple destination points with similar characteristics. Rather than configuring completely separate parameters for each destination, the system uses a set of configurable UTCs that can be selectively applied based on destination identification. This reduces signaling overhead by reusing common parameters across multiple destinations while maintaining the ability to manage interference specific to each destination through selective UTC activation.
Data Source
AI summary
Embodiments contemplate wireless transmit/receive unit (WTRU) transmissions of different types of uplink channels and/or signals in a system deployment where multiple destination points may exist. Some embodiments contemplate that a WTRU may select the destination point of a transmission on a dynamic basis. In one or more systems where destination point selection from among multiple potential destination points may be possible for a WTRU transmission, some embodiments contemplate the determination of the handling of hybrid automatic repeat request (HARQ) retransmissions and for different power headroom reporting mechanisms. Embodiments also contemplate the reduction and/or inhibition of WTRU transmissions to destination points to which the WTRU may have lost connectivity.