Dynamic TDD HARQ Timing for Flexible Sub-Frame Allocation
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Solution Overview
Problem
Existing Time Division Duplex (TDD) systems lack an uplink and downlink Hybrid Automatic Repeat Request (HARQ) timing relationship for dynamic allocation of sub-frames, which hampers the efficient transmission of uplink and downlink data in dynamic TDD systems.
Innovation Solution
A method is introduced where user equipment receives indication information from the network side to determine the appropriate uplink sub-frame for transmitting PUSCH data based on timing relationships or fixed relationships, ensuring proper HARQ timing for dynamic sub-frame allocation, allowing flexible sub-frame configuration to adapt to varying traffic demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static or semi-static sub-frame allocation is used in TDD systems, then network planning and coverage are simplified, but the system cannot adapt to dynamically varying uplink and downlink traffic demands
Solution Approach 1:
The patent implements dynamic sub-frame allocation where the network side can flexibly configure uplink and downlink sub-frames based on real-time traffic conditions. The network side determines timing relationships for HARQ processes dynamically, allowing the system to adapt to varying traffic demands rather than using fixed static allocation schemes.
Solution Approach 2:
The patent changes the timing relationship parameters between downlink and uplink sub-frames dynamically. By allowing the network side to configure different timing offsets and HARQ process timings based on traffic conditions, the system can optimize performance for different traffic scenarios without requiring complex reconfiguration of the entire frame structure.
2Productivity
If dynamic sub-frame allocation is implemented without HARQ timing relationships, then traffic adaptability improves, but data transmission efficiency deteriorates due to lack of proper timing coordination
Solution Approach 1:
The patent establishes HARQ timing relationships that provide feedback mechanisms between downlink and uplink transmissions. The network side can determine appropriate timing for HARQ acknowledgments and retransmissions based on the dynamic sub-frame allocation, ensuring that feedback loops are maintained even when sub-frames are flexibly configured.
Solution Approach 2:
The patent pre-determines timing relationships for HARQ processes when configuring dynamic sub-frame allocation. By establishing these timing relationships in advance based on expected traffic patterns and system requirements, the network side ensures that proper timing coordination is maintained without requiring complex real-time calculations during transmission.
3Adaptability or versatility
If flexible sub-frames are used for dynamic traffic adaptation, then traffic demand responsiveness improves, but HARQ timing coordination becomes uncertain
Solution Approach 1:
The patent introduces the network side as an intermediary that mediates between dynamic sub-frame allocation and HARQ timing requirements. The network side determines the timing relationships based on the flexible sub-frame configuration, acting as a coordinator that ensures HARQ timing reliability is maintained even when sub-frames are dynamically adjusted to meet traffic demands.
Data Source
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AI summary
The embodiments of the present invention relate to the technical field of wireless communications, and particularly, to a time-division duplexing communication method, system and device, which are used for solving the problem in the prior art that there is no uplink or downlink HARQ sequential relationship for a dynamic uplink and downlink subframe distribution solution. A method of time division duplex transmission of uplink data of the present application includes: a user equipment receiving indication information from the a user equipment receiving indication information from the network side in a nth sub-frame, sub-frame n, in a radio frame, wherein the sub-frame 0 and the sub-frame 5 in the radio frame are fixed downlink sub-frames, the sub-frame 2 is a fixed uplink sub-frame, the sub-frame 1 is a special sub-frame, the sub-frame 6 is a special sub-frame or a downlink sub-frame, the remaining sub-frames are flexible sub-frames which are with a variable transmission direction, and the sub-frame n is a fixed downlink sub-frame or a special sub-frame; and the user equipment transmitting PUSCH data in at least one uplink sub-frame after the sub-frame n upon determining from the indication information that the PUSCH data needs to be transmitted to the network side.