Latency Reduction in TDD Carrier Aggregation Systems
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Solution Overview
Problem
Current 3GPP LTE specifications have limited options for switching intervals between uplink and downlink in TDD operation, resulting in insufficient reduction of latency for latency-constrained services.
Innovation Solution
The proposed solution involves aggregating time division duplex (TDD) carriers with different temporal distributions of uplink and downlink times, allowing for more flexible and frequent switching between uplink and downlink modes, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If current 3GPP LTE frame configurations are used for TDD UL-DL switching, then the system structure is simple and standardized, but the switching frequency is limited and latency reduction is insufficient
Solution Approach 1:
The patent segments the TDD carrier into multiple component carriers, each with its own independent UL-DL configuration. This allows different parts of the spectrum to have different switching frequencies and patterns, enabling more frequent UL-DL switches overall while maintaining backward compatibility with existing LTE frame structures.
Solution Approach 2:
The patent introduces dynamic UL-DL configuration where the switching points can be adjusted based on traffic conditions. The system can dynamically reconfigure which component carriers switch more frequently to reduce latency for latency-sensitive services while maintaining simpler configurations for other carriers.
2Productivity
If TDD carriers with different temporal distributions are aggregated, then latency is reduced and transmission availability is improved, but system complexity increases
Solution Approach 1:
The patent makes the TDD carrier aggregation system universal by allowing eNodeBs to aggregate carriers with different UL-DL configurations. The system can serve multiple service types simultaneously - latency-sensitive services use carriers with more frequent switching while bulk data services use carriers with simpler configurations, all within the same aggregated carrier system.
Solution Approach 2:
The patent implements feedback mechanisms where the eNodeB monitors traffic patterns and service requirements to dynamically adjust which carriers use which UL-DL configurations. This feedback loop allows the system to optimize transmission availability while managing complexity through data-driven decision making.
Data Source
AI summary
The present invention is concerned with different novel concepts for reducing latency in data transmission. These concepts may be exploited by a transceiver configured to perform wireless data communication with a third party device by aggregating time division duplex carriers having different temporal distribution of uplink times and downlink times. These concepts may further be exploited by an apparatus configured to perform data transmission or reception via allocations of transmission resources of aggregated carriers in units of transmission time intervals into which the aggregated carriers are subdivided, wherein the aggregated carriers are temporally subdivided into the transmission time intervals in a temporal grid, respectively, wherein the aggregated carriers' grids are temporally mutually offset.