Dual TDD Carrier Configuration for Low-Latency Uplink and Downlink
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Solution Overview
Problem
The slot configuration of TDD carriers in 5G communication systems limits latency, preventing its application in vertical industries due to uplink and downlink data having to wait for non-continuous time slots, exceeding the 1 ms latency requirement.
Innovation Solution
A method involving a combination of two TDD carriers, where one type is predominantly downlink and the other is predominantly uplink, allowing data transmission to occur on the appropriate type carrier instead of waiting for the next available slot, mimicking FDD performance while maintaining a wider bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If TDD carrier slot configuration is used, then bandwidth is widened, but latency increases due to non-continuous time slots
Solution Approach 1:
The patent combines two TDD carriers (first-type and second-type) into a carrier aggregation configuration, where the first-type carrier provides downlink resources and the second-type carrier provides uplink resources. This merging allows the system to achieve FDD-like simultaneous uplink-downlink transmission while maintaining TDD's bandwidth advantages, thereby reducing latency without sacrificing bandwidth.
2Device complexity
If single TDD carrier is used, then configuration is simple, but uplink and downlink data must wait for non-continuous time slots
Solution Approach 1:
The patent segments the TDD carrier configuration into two distinct types: first-type TDD carrier (predominantly downlink) and second-type TDD carrier (predominantly uplink). This segmentation allows independent optimization of uplink and downlink transmission, enabling continuous data transmission without waiting for non-continuous time slots, thereby improving transmission efficiency while maintaining manageable configuration complexity.
3Loss of time
If TDD carrier combination is used, then latency is reduced, but configuration complexity increases
Solution Approach 1:
The patent establishes a universal carrier aggregation framework that can accommodate different TDD carrier configurations. The network device can flexibly configure the first-type and second-type TDD carriers with different downlink-uplink ratios, making the system adaptable to various latency requirements. This multi-functionality allows the system to achieve low latency while managing configuration complexity through standardized aggregation mechanisms.
Data Source
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AI summary
Embodiments of this application provide a carrier configuration method, an apparatus, and a system. The method includes: A terminal device receives configuration information of at least two TDD carriers from a network device, where the at least two TDD carriers include at least one first-type TDD carrier and at least one second-type TDD carrier, and the configuration information indicates that in one slot configuration period, each slot corresponding to the first-type TDD carrier includes only downlink symbols or mainly downlink symbols, and indicates that in the slot configuration period, each slot corresponding to the second-type TDD carrier includes only uplink symbols or mainly uplink symbols. The terminal device transmits information based on the configuration information of the at least two TDD carriers. Two or more TDD carriers are combined to achieve an effect similar to that of an FDD carrier. In this way, resources for sending uplink and downlink data are fully guaranteed, a latency can be reduced, and uplink and downlink performance can be improved.