Auxiliary Band TDD Frame Segmentation for Low-Delay Wireless Communication
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Solution Overview
Problem
Conventional TDD wireless communication systems face performance degradation due to increased delay and overhead in user data transmission, especially in scenarios requiring small delay and high-speed movement, as they rely on fixed frame lengths and guard intervals, which are not suitable for accommodating variable asymmetric traffic.
Innovation Solution
The introduction of one or more auxiliary bands in a TDD wireless communication system allows for the transmission and reception of data signals and control signals in units of slots shorter than a frame, with one auxiliary band dedicated to either downlink or uplink transmission, reducing the need for extended guard intervals and enabling flexible adjustment of the DL-UL ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the frame length is increased to reduce overhead due to guard intervals, then the overhead is reduced, but the delay of control signals such as channel information and feedback information for retransmission request is increased
Solution Approach 1:
The patent segments the frame structure into multiple slots, allowing control signals and data to be transmitted in distributed time units. This segmentation enables shorter effective transmission intervals within the frame, reducing control signal delay while maintaining overall frame structure for overhead management.
Solution Approach 2:
The patent implements periodic slot-based transmission within the frame structure, where control signals and data are transmitted at regular intervals. This periodic action allows for timely control signal delivery without requiring the entire frame to be extended, thus reducing delay while managing overhead efficiently.
2Productivity
If the TDD scheme is used to flexibly adjust DL-UL ratio and reduce feedback overhead, then frequency use efficiency is improved, but synchronization complexity and guard interval overhead are increased
Solution Approach 1:
The patent divides the TDD frame into multiple slots with flexible DL-UL assignments. This segmentation allows the system to achieve flexible DL-UL ratio adjustment without requiring complex whole-frame synchronization, as each slot can be independently configured and managed.
Solution Approach 2:
The patent implements dynamic slot-based resource allocation where DL and UL slots can be flexibly adjusted within the frame structure. This dynamic approach enables the system to adapt to varying traffic conditions while maintaining manageable synchronization complexity through standardized slot boundaries.
3Reliability
If guard interval is inserted to accommodate propagation delay and switching delay in TDD, then bidirectional communication is enabled, but overhead in transmission of user data is increased
Solution Approach 1:
The patent segments the transmission into multiple slots within a frame, distributing the guard interval requirements across slot boundaries rather than requiring a single large guard interval. This segmentation reduces the overhead impact on user data transmission while maintaining reliable bidirectional communication.
Solution Approach 2:
The patent applies guard intervals only where necessary at slot boundaries rather than continuously throughout the transmission. This partial application of guard intervals maintains bidirectional communication reliability while minimizing overhead in user data transmission by avoiding excessive guard interval insertion.
Data Source
AI summary
An apparatus for bidirectional communication using one or more auxiliary bands in a wireless communication system is provided. A primary band transmitter transmits data over one or more primary bands in a frame. A primary band receiver receives data over the one or more primary bands in the frame. An auxiliary band transmitter transmits data over one or more first auxiliary bands in the frame. An auxiliary band receiver receives data over the one or more first auxiliary bands or over the one or more first auxiliary bands and one or more second auxiliary bands in the frame. Therefore, it is possible to facilitate a low-delay service and to cope with a rapid channel change due to high-speed movement.