Parameterized Self-Contained Subframe Structure for Wireless Latency
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing subframe structures to accommodate diverse traffic types and service requirements, particularly in balancing latency and buffer requirements across different communication protocols like LTE/LTE-A and Wi-Fi.
Innovation Solution
A parameterized self-contained subframe structure is introduced, combining interlaced and one-shot subframe structures, which includes an interlaced portion for medium latency traffic and a tail portion with reduced trigger-response delay for low-latency traffic, allowing dynamic adjustment based on traffic type and service level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If an interlaced subframe structure is used, then medium latency traffic is accommodated, but latency requirements for low-latency traffic are not met
Solution Approach 1:
The subframe structure is segmented into two distinct portions: an interlaced portion for medium latency traffic and a tail portion for low-latency traffic. This segmentation allows each portion to be optimized for its specific traffic type, with the tail portion providing reduced trigger-response delay for low-latency requirements while the interlaced portion maintains the periodic structure for medium latency traffic.
Solution Approach 2:
The subframe structure is made dynamic by allowing the tail portion to be configured with reduced trigger-response delay parameters that can be adjusted based on traffic type and service level. This dynamic adjustment enables the system to adapt to diverse traffic requirements within a single unified framework, improving latency performance for low-latency traffic while maintaining compatibility with medium latency traffic.
2Adaptability or versatility
If a unified subframe structure is used for diverse traffic types, then adaptability is improved, but buffer requirements increase
Solution Approach 1:
By segmenting the subframe into interlaced and tail portions with different trigger-response delay characteristics, the system can process different traffic types through appropriate segments. This reduces the need for large buffers to accommodate all traffic types simultaneously, as low-latency traffic can be handled by the tail portion with its reduced delay requirements.
Solution Approach 2:
Different portions of the subframe structure are assigned different quality characteristics: the interlaced portion maintains periodic timing for medium latency traffic, while the tail portion provides reduced trigger-response delay for low-latency traffic. This local differentiation allows the system to meet diverse buffer requirements without requiring a single high-capacity buffer for all traffic types.
3Reliability
If separate MAC protocols are used for LTE/LTE-A and Wi-Fi, then protocol-specific performance is optimized, but system complexity increases
Solution Approach 1:
The parameterized subframe structure with configurable interlaced and tail portions provides a universal framework that can accommodate both LTE/LTE-A and Wi-Fi protocols within a single MAC structure. By adjusting the trigger-response delay parameters and portion configurations, the same underlying protocol can optimize performance for different protocol requirements without requiring separate MAC implementations.
Data Source
AI summary
Techniques are described for wireless communication. A first method includes wirelessly communicating at a first device, with a second device, according to a first subframe structure; receiving a subframe truncation parameter from the second device; and terminating the first subframe structure based at least in part on the subframe truncation parameter. The first subframe structure includes a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs. A second method includes wirelessly communicating at a first device, with a second device, according to a parameterized self-contained subframe structure having an interlaced portion and a tail portion; and reducing a delay indicated by a nominal trigger-response delay parameter associated with a downlink TTI, to enable a response message corresponding to the downlink TTI to be transmitted during the tail portion and before termination of the subframe structure.


