Coupled Mode Common Uplink Burst in TDD Subframes
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Solution Overview
Problem
Current Time Division Duplex (TDD) wireless communication systems face challenges in efficiently managing uplink control latency and channel estimation due to the separation of uplink and downlink transmissions in frequency, which affects data throughput and spectrum utilization, especially in high-frequency unpaired bands.
Innovation Solution
The implementation of a common uplink burst structure that includes both Sounding Reference Signals (SRS) and control channels within the same frequency bandwidth, allowing for coupled transmission and demodulation, thereby decoupling uplink control latency from the downlink/uplink switch pattern and enhancing channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If uplink and downlink transmissions are separated in frequency using TDD mode, then spectrum utilization is improved, but uplink control latency increases
Solution Approach 1:
The patent merges the control channel and SRS transmission into a common uplink burst structure that spans the same frequency bandwidth. This combining allows the control information to be transmitted in the uplink direction without requiring separate downlink resources, thereby reducing uplink control latency while maintaining efficient spectrum utilization through TDD operation.
2Measurement precision
If control channel and SRS are transmitted separately, then channel estimation accuracy may be compromised, but transmitting them together in a common burst improves frequency diversity
Solution Approach 1:
The control channel and SRS are combined in a common uplink burst spanning the same frequency bandwidth. This merging enables the control channel to benefit from the frequency diversity provided by the wideband SRS transmission, improving both channel estimation accuracy and frequency diversity simultaneously.
Solution Approach 2:
The common uplink burst acts as an intermediary structure that carries both the control channel and SRS together. This intermediate transmission vehicle allows the control information to leverage the channel estimation capabilities of the SRS while maintaining their functional independence for processing at the receiver.
3Loss of time
If uplink control is decoupled from downlink/uplink switch pattern, then uplink control latency is reduced, but system complexity increases
Solution Approach 1:
The system dynamically configures common uplink bursts within the flexible TDD frame structure, allowing uplink control transmissions to occur independently of the downlink/uplink switch pattern. This dynamic approach enables reduced uplink control latency while maintaining compatibility with existing TDD operations through configurable burst positions and durations.
Data Source
AI summary
Wireless communications systems and methods related to a coupled mode common uplink burst in Time Division Duplex (TDD) sub-frame structure are disclosed. Upon receiving a signal requesting a user to transmit a sounding reference signal (SRS) and a control channel within a common uplink (UL) burst in each sub-frame communicated between the user and a base station, the user transmits the common UL burst comprising the SRS coupled with the control channel spanning the same frequency bandwidth.