TDD-OFDMA Frame Zone Segmentation for Short Latency Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile communication systems face challenges in achieving short latency data transmission, which is essential for high-speed data services, particularly for real-time services like VoIP, due to limitations in existing frame structures and latency calculations.
Innovation Solution
The introduction of a method that divides frames into multiple zones, including a short latency zone, within the TDD-OFDMA scheme, where specific channels like Downlink Short Latency Control Channel (D-SLCCH) and Uplink Short Latency Data Channel (U-SLDCH) are defined to support short latency data transmission, allowing for reduced processing and retransmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional TDD-OFDMA frame structure is used, then the system can support both high-speed and low-speed data services, but it cannot achieve short latency data transmission required for real-time services like VoIP
Solution Approach 1:
The frame structure is segmented into multiple zones including a short latency zone and a non-short latency zone. Each zone is optimized for specific service requirements: the short latency zone handles real-time traffic with reduced processing delays, while the non-short latency zone handles other data services. This segmentation allows the system to achieve short latency for critical services without compromising overall system capacity.
Solution Approach 2:
Different parts of the frame structure are assigned different properties: the short latency zone has reduced processing time and optimized resource allocation for real-time services, while other zones maintain conventional timing for non-real-time services. This local optimization enables the system to provide differentiated quality of service without requiring complete frame structure redesign.
2Adaptability or versatility
If the frame structure is optimized for short latency transmission, then real-time services can be supported, but the system cannot efficiently handle both short latency and non-short latency packets simultaneously
Solution Approach 1:
The frame is divided into multiple zones with different latency characteristics. The short latency zone is dedicated to real-time services requiring rapid transmission, while the non-short latency zone handles other data services. This segmentation enables the system to simultaneously support multiple service types with different latency requirements without compromising either service category.
Solution Approach 2:
The frame structure is designed to serve multiple functions: it can handle both short latency and non-short latency packets within the same frame transmission cycle. The short latency zone provides rapid service for real-time applications, while the non-short latency zone provides standard service for other applications, making the system universally applicable to diverse service requirements.
3Loss of time
If conventional frame structures are used without zone division, then the system structure remains simple, but retransmission delay cannot be reduced for short latency packets
Solution Approach 1:
By segmenting the frame into short latency and non-short latency zones, the system can apply different retransmission strategies to each zone. The short latency zone uses optimized retransmission protocols with reduced delay, while the non-short latency zone uses conventional retransmission methods. This segmentation enables reduced retransmission delay for critical packets without complicating the overall system architecture excessively.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A method for supporting short latency data transmission in a mobile communication system is provided. A frame is divided into an uplink subframe and a downlink subframe. Each of the uplink and downlink subframes includes at least one zone for the short latency data transmission and each of the at least one zone includes a first channel for indicating data resource assignment, a second channel over which to transmit data, or a third channel for feedback signal reception. The method includes indicating a location and a size of the second channel using the first channel included in any one of the at least one zone by a transmitting end, transmitting data over the second channel, and receiving feedback information for the data, which has been transmitted over the second channel, over the third channel.