Terminal Memory Storage for Unlicensed Band Retransmission Optimization
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Solution Overview
Problem
In telecommunications, particularly in unlicensed frequency bands, communications between a terminal and a base station can be delayed due to channel busy conditions, leading to inefficiencies such as spectral efficiency loss and unnecessary retransmissions.
Innovation Solution
A method is proposed where a terminal stores states representative of data packet transmissions from the base station in memory areas identified by control information, and transmits these states to the base station when authorized to emit. This allows the base station to determine transmission failures and optimize retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LBT access protocol is used in unlicensed frequency bands, then channel access is facilitated, but communication delays occur when channel is busy
Solution Approach 1:
The terminal performs channel listening and obtains channel access in advance before data transmission is needed. By proactively securing the channel when it becomes available, the terminal can immediately transmit data without waiting, thereby reducing communication delays caused by busy channel conditions.
2Reliability
If base station performs systematic retransmissions when feedback is not received, then transmission reliability is improved, but spectral efficiency is reduced
Solution Approach 1:
The terminal feeds back channel state information and decoding results to the base station when channel access is obtained. This feedback mechanism allows the base station to distinguish between cases where the terminal did not receive the transmission versus cases where the terminal successfully decoded the data but could not send ACK/NACK feedback due to channel unavailability, enabling intelligent retransmission decisions that improve spectral efficiency while maintaining reliability.
Solution Approach 2:
The terminal prepares decoding results and channel state information in advance and transmits them as soon as channel access is obtained. This preliminary preparation of feedback information allows the base station to make informed decisions about whether retransmissions are necessary, avoiding unnecessary systematic retransmissions and improving spectral efficiency.
3Productivity
If terminal stores transmission states in memory areas, then retransmission optimization is enabled, but device complexity increases
Solution Approach 1:
The terminal's memory is divided into multiple storage areas, each dedicated to storing information about a specific transmission. This segmentation allows efficient organization and retrieval of transmission states without requiring complex management structures, as each storage area independently tracks its associated transmission's decoding status and timing information.
Solution Approach 2:
The storage areas are configured to automatically expire after a predetermined time period without requiring active management or cleanup operations. This self-service mechanism reduces complexity by eliminating the need for complex memory management algorithms, as the system automatically discards outdated transmission state information.
Data Source
AI summary
A method for managing a communication between a base station and a terminal. The terminal is associated with at least one memory having at least two storage areas. The terminal implements: at least one step of storing, in one of the storage areas, a state representative of a transmission, by the base station, of at least one current data packet and control information associated with the current data packet, called current transmission, the storage area being identified by a storage area indicator borne by the control information associated with the current data packet; and transmission, to the base station, of all states stored in the storage areas, when the terminal is authorized to emit.