Common Uplink Burst Decoupling TDD Latency
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Solution Overview
Problem
Current Time Division Duplex (TDD) wireless communication systems face challenges in decoupling uplink latency due to the shared frequency spectrum for uplink and downlink transmissions, leading to interference and increased latency in transmitting time-critical control information.
Innovation Solution
Implementing a common uplink burst in each sub-frame that includes physical layer acknowledgments, scheduling requests, buffer status reports, or sounding reference signals, allowing for the transmission of scheduled uplink payload data, thereby reducing latency and minimizing interference by using orthogonal frequency/time resources across all sub-frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink and downlink transmissions share the same frequency spectrum in TDD mode, then spectrum utilization is improved, but interference between uplink and downlink increases and uplink latency worsens
Solution Approach 1:
The patent segments the uplink transmission by introducing a common uplink burst that is separate from the scheduled uplink payload data transmission. This common UL burst occurs in every sub-frame and carries time-critical control information, while scheduled UL data transmission follows traditional patterns. This segmentation allows control information to be transmitted independently without being blocked by downlink transmissions or waiting for scheduled uplink opportunities, thereby reducing interference impact and latency while maintaining efficient spectrum utilization.
2Device complexity
If uplink control information is transmitted only in scheduled uplink sub-frames, then resource allocation is simplified, but uplink latency for time-critical information increases
Solution Approach 1:
The patent implements preliminary action by establishing a common uplink burst mechanism that is pre-configured to occur in every sub-frame regardless of traditional uplink scheduling. This allows time-critical control information to be transmitted immediately when needed, without waiting for scheduled uplink opportunities. The preliminary setup of this common burst structure enables low-latency control information transmission while maintaining relatively simple resource allocation through predefined patterns.
3Loss of time
If common uplink burst is transmitted in every sub-frame, then uplink control latency is reduced, but system complexity increases
Solution Approach 1:
The common uplink burst is designed with multi-functionality to reduce system complexity. It can carry multiple types of uplink control information including physical layer acknowledgments, scheduling requests, buffer status reports, and sounding reference signals all in a single transmission opportunity. This universal structure eliminates the need for separate dedicated resources for each control information type, thereby reducing overall system complexity while achieving low-latency transmission of all control information in every sub-frame.
Data Source
AI summary
Wireless communications systems and methods related to decoupling uplink latency using common uplink (UL) burst in Time Division Duplex (TDD) sub-frame structure are disclosed. User equipment (UE) can transmit to a base station a common UL burst in each sub-frame communicated between UE and the base station, wherein the common UL burst comprises at least one of: a physical layer (PHY) acknowledgement (ACK), a scheduling request (SR), a buffer status report (BSR), or a sounding reference signal (SRS). UE can be further configured to transmit scheduled UL payload data in at least one common UL burst of at least one sub-frame communicated between the UE and the base station.