TDD Uplink Carrier Aggregation Frame Structures for Unequal Bandwidths
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink carrier aggregation of two time division duplex carriers, particularly in scenarios where the bandwidth of one carrier is lower than the other, leading to inefficiencies in frame structure alignment and resource utilization.
Innovation Solution
Implementing a time division multiplexed uplink carrier aggregation (TMDed UL CA) framework with specific frame structures, including various slot sequences for downlink and uplink transmissions, tailored for carriers with different bandwidths, such as 2.5 or 5 millisecond single cycle slot sequences with varying numbers of consecutive slots for UL and DL slots, to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If frame structures are aligned for carriers with different bandwidths, then spectral efficiency is improved, but device complexity increases due to the need to manage multiple slot sequences and timing configurations
Solution Approach 1:
The patent applies parameter changes by introducing different slot sequence configurations (2.5ms and 5ms single cycle slot sequences) with varying numbers of consecutive UL and DL slots to match different carrier bandwidths. This allows the frame structure parameters to be adjusted according to the specific bandwidth requirements of each carrier, thereby improving spectral efficiency while maintaining manageable complexity through standardized configuration options.
Solution Approach 2:
The patent implements dynamics by enabling the wireless communication system to dynamically select and switch between different slot sequence configurations based on the carrier bandwidth and traffic requirements. This dynamic adaptation allows the system to optimize frame structure alignment in real-time, improving spectral efficiency without permanently increasing device complexity through multiple fixed configurations.
2Productivity
If multiple slot sequences are used to accommodate different bandwidths, then resource utilization is improved, but the difficulty of detecting and measuring frame structures increases
Solution Approach 1:
The patent applies segmentation by dividing the frame structure into distinct slot sequences (2.5ms and 5ms single cycle slot sequences) with clearly defined DL and UL slots. Each slot sequence is segmented to accommodate specific bandwidth requirements, allowing the system to improve resource utilization through targeted configurations while reducing detection difficulty through clear structural boundaries and standardized patterns.
Solution Approach 2:
The patent uses parameter changes to define different slot sequence configurations with specific parameters (cycle duration, number of consecutive slots) that can be detected and measured. By standardizing these parameters across different bandwidth scenarios, the patent improves resource utilization while maintaining detectability through consistent measurement criteria.
3Adaptability or versatility
If carriers with different bandwidths are aggregated, then adaptability is improved, but frame structure alignment becomes more difficult
Solution Approach 1:
The patent applies universality by creating a multi-functional slot sequence framework that can accommodate different carrier bandwidths through standardized configurations. The 2.5ms and 5ms single cycle slot sequences serve multiple functions across different bandwidth scenarios, enabling carrier aggregation adaptability while reducing alignment complexity through a universal configuration approach rather than custom solutions for each bandwidth combination.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a configuration for time division multiplexed uplink carrier aggregation of a first time division duplex carrier with a second time division duplex carrier, wherein a bandwidth of the second time division duplex carrier is lower than a bandwidth of the first time division duplex carrier, wherein the configuration indicates a frame structure corresponding to the second time division duplex carrier, and wherein the frame structure comprises a slot sequence, and communicate in accordance with the configuration. Numerous other aspects are provided.