Wireless Frame Slot Configuration for Dynamic UL-DL Ratio Control
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Solution Overview
Problem
The 5G wireless communication system requires dynamic control of the downlink-uplink ratio and immediate retransmission in response to HARQ ACK/NACK transmissions, which is challenging due to the high frequency band operation and limitations in Frequency Division Duplex (FDD) in the 5G system.
Innovation Solution
A method and apparatus for transmitting and receiving data using a radio frame structure with subframes, where each subframe includes a predetermined number of slots, and the foremost part of each slot contains configuration information, enabling dynamic control of the UL-DL ratio and rapid retransmission by including a slot indicator to differentiate between downlink and uplink slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Frequency Division Duplex (FDD) is used in 5G system, then data transmission can be performed simultaneously in uplink and downlink, but it is difficult to secure downlink-uplink frequency and achieve dynamic control of UL-DL ratio
Solution Approach 1:
The patent applies Time Division Duplex (TDD) instead of FDD to enable dynamic control of the UL-DL ratio. In TDD, the same frequency is used for both uplink and downlink, but different time slots are allocated. The system can dynamically adjust the number of downlink slots and uplink slots within a frame structure, allowing flexible adaptation to varying traffic demands without the complexity of managing separate frequency resources.
Solution Approach 2:
The patent transitions from frequency-domain separation (FDD) to time-domain separation (TDD). By introducing the time dimension for resource allocation, the system achieves dynamic UL-DL ratio control through slot configuration within frames, eliminating the need for separate uplink and downlink frequency pairs and simplifying frequency resource management.
2Reliability
If immediate retransmission is required in response to HARQ ACK/NACK, then data transmission reliability is improved, but transmission delay increases due to the need for rapid response
Solution Approach 1:
The patent configures the frame structure in advance with predetermined slot allocations and identifies specific slots for HARQ feedback transmission. By pre-planning the resource allocation and feedback timing, the system enables immediate retransmission responses without ad-hoc resource negotiation, thus improving reliability while minimizing the time loss associated with rapid HARQ operations.
3Adaptability or versatility
If configuration information is included in the foremost part of each slot, then dynamic control of slot configuration is enabled, but overhead increases
Solution Approach 1:
The patent divides the frame into multiple slots, with configuration information placed in the foremost part of each slot. This segmentation allows each slot to be independently configured and controlled, enabling fine-grained dynamic adaptation of slot structures to match instantaneous traffic requirements. While this does increase overhead, the modular approach allows efficient resource utilization that offsets the overhead cost.
Data Source
AI summary
Disclosed is a method for transmitting and receiving data in a wireless communication system, the method comprising the steps of: generating a wireless frame including a predetermined number of subframes; and transmitting and receiving a control signal and data by using the generated wireless frame, wherein the subframes include the predetermined number of slots, and the foremost part of each slot includes the configuration information of the slots.