Wireless Control Channel Signaling for Multiple TTI Lengths
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing control channel signaling with multiple transmission time intervals (TTIs), particularly in reducing latency and optimizing resource allocation for different TTI lengths, which affects overall system efficiency and user equipment (UE) performance.
Innovation Solution
The described techniques involve configuring control information transmission for different TTI lengths, such as 1 ms and 0.5 ms, using established control channel resources, with specific search spaces for each TTI, and employing blind decoding methods based on limited decoding candidates and hybrid automatic repeat request (HARQ) round trip times to identify and decode control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TTI lengths are supported concurrently, then system adaptability and latency reduction are improved, but control channel resource allocation complexity increases
Solution Approach 1:
The control channel search space is segmented into multiple distinct sets, with each set dedicated to specific TTI lengths. This allows the UE to monitor different search spaces for different TTIs, reducing the complexity of resource allocation while supporting multiple TTI lengths concurrently.
Solution Approach 2:
The patent introduces a new dimension for resource allocation by defining search spaces in the frequency domain with specific offset relationships. The second search space is determined based on the first search space using frequency domain offsets, creating a structured multi-dimensional resource allocation scheme that simplifies management of multiple TTI lengths.
2Measurement precision
If separate search spaces are defined for different TTI lengths, then control information decoding accuracy is improved, but blind decoding complexity increases
Solution Approach 1:
The patent establishes predetermined relationships between search spaces using frequency domain offsets and index mappings before blind decoding begins. The second search space indices are determined based on the first search space, allowing the UE to prepare monitoring configurations in advance and reduce real-time decoding complexity.
Solution Approach 2:
Different search spaces are configured with specific local characteristics including frequency domain offsets, monitoring periodicities, and association rules tailored to specific TTI lengths. This localized optimization allows accurate decoding for each TTI type while managing overall complexity through structured local configurations.
3Productivity
If control information for different TTIs is transmitted using the same resources, then resource utilization efficiency is improved, but control information reliability decreases
Solution Approach 1:
The control channel resources are segmented into multiple search spaces, with each search space dedicated to specific TTI lengths. This segmentation ensures that control information for different TTIs is transmitted in separate, dedicated resources, preventing interference and maintaining reliability while still achieving high resource utilization through systematic allocation.
Solution Approach 2:
The patent enables dynamic configuration of search spaces and their associations with different TTI lengths. The system can adaptively allocate and reconfigure search space resources based on traffic conditions and TTI requirements, maintaining both high resource utilization and reliable control information transmission through flexible dynamic management.
Data Source
AI summary
Control information may be transmitted for different TTI lengths. Different control information for the different TTIs may be transmitted using control channel resources that are established for communication of control information, such as a physical downlink control channel (PDCCH), for example. Control information for a first TTI may be located in a first set of resources, and control information for a second TTI may be located in a second set of resources. The first set of resources may be located within a first search space that may be searched by a user equipment (UE) to identify the first control information. The second set of resources may be located within a second search space that may be searched by the UE to identify the second control information.