Concurrent Subframe Coordination for Low Latency TDD Transmission
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Solution Overview
Problem
The Long Term Evolution (LTE) TDD frame structure leads to relatively long information waiting durations, which are inadequate for services with high latency requirements, such as ultra-reliable and low latency communications (URLLC), as only uplink or downlink information transmission can occur in specific subframes, resulting in delayed data exchange.
Innovation Solution
Implementing a concurrent subframe in the TDD frame structure, where uplink and downlink information transmission can occur simultaneously, by sending indication information between communications devices to coordinate the use of specific time-frequency resources, allowing for bidirectional data exchange without waiting for specific uplink or downlink subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If TDD frame structure is used with specific uplink-downlink configurations, then system structure is simplified and easy to implement, but information waiting duration becomes long for high latency services
Solution Approach 1:
The patent applies dynamics by making the subframe configuration flexible and adaptable. Instead of fixed TDD uplink-downlink configurations, the system dynamically determines whether to use uplink subframes, downlink subframes, or concurrent subframes based on service requirements. This allows the frame structure to adapt to different service types (e.g., URLLC vs. traditional services), resolving the contradiction between structural simplicity and latency performance.
Solution Approach 2:
The patent changes the parameter of subframe directionality from fixed (either uplink or downlink) to variable (can be uplink, downlink, or concurrent). By introducing concurrent subframes where both uplink and downlink transmissions can occur simultaneously, the system modifies the temporal parameters of information transmission, reducing waiting duration while maintaining implementation feasibility through standardized frame structures.
2Device complexity
If traditional TDD subframe transmission is used, then device complexity is low, but spectrum resource utilization is insufficient
Solution Approach 1:
The patent merges uplink and downlink transmissions in concurrent subframes, allowing both directions to occur simultaneously within the same subframe. This combining of previously separate transmission channels increases spectrum resource utilization without significantly increasing device complexity, as the merging is achieved through coordinated scheduling rather than complex hardware modifications.
Solution Approach 2:
The patent introduces a new dimension to subframe utilization by creating concurrent subframes that operate in both uplink and downlink directions simultaneously. This dimensional change from single-direction to dual-direction transmission within the same time resource improves spectrum efficiency while maintaining relatively simple device architecture through standardized multi-functional subframe handling.
3Loss of time
If concurrent subframe transmission is implemented, then latency is reduced and spectrum utilization is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
The patent applies preliminary action by determining service types and their latency requirements in advance, before actual transmission occurs. The network device pre-configures appropriate subframe types (uplink, downlink, or concurrent) based on service characteristics, and informs terminal devices of these configurations ahead of time. This preliminary planning reduces latency for time-sensitive services while managing device complexity through advance coordination rather than real-time complex decision-making.
Solution Approach 2:
The patent implements feedback mechanisms where terminal devices report service requirements and transmission status to the network device, which then adjusts subframe configurations accordingly. This feedback loop enables the system to optimize latency performance for different services while managing device complexity through intelligent, information-driven coordination rather than purely complex hardware architectures.
Data Source
AI summary
Example information transmission methods and apparatus are described. In one example method, a first communications device sends indication information to a second communications device, where the indication information is used to indicate a concurrent subframe in which the first communications device and the second communications device perform information transmission. The first communications device sends first information to the second communications device on a first time-frequency resource in the concurrent subframe. The first communications device receives, on a second time-frequency resource in the concurrent subframe, second information sent by the second communications device.