D2D User Terminal Scheduling Assignment for Retransmission Management
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Solution Overview
Problem
In Device-to-Device (D2D) communication, the reception-side user terminal lacks a mechanism to distinguish between initial transmission data and retransmission data when the transmission-side user terminal decides the number of re-transmissions independently, leading to uncertainty until the data contents are checked.
Innovation Solution
A user terminal transmits a scheduling assignment indicating the location of a radio resource used for communication data, including information on the number of re-transmissions, allowing the reception-side to understand and manage initial and retransmission data based on the scheduling assignment, and optionally uses a new data identifier to differentiate between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmission-side user terminal decides the number of re-transmissions independently without feedback from the reception-side, then the transmission efficiency is improved by reducing feedback overhead, but the reception-side cannot distinguish between initial transmission data and retransmission data
Solution Approach 1:
The patent applies preliminary action by pre-configuring the reception-side user terminal with the number of re-transmissions through higher layer signaling before data transmission begins. This allows the reception-side to know in advance how many re-transmissions to expect, enabling it to distinguish between initial transmission and retransmission data without requiring feedback mechanisms during the transmission process.
Solution Approach 2:
The patent uses the scheduling assignment as an intermediary carrier to convey the number of re-transmissions information from the transmission-side to the reception-side. This scheduling assignment acts as a mediator that carries the necessary control information, allowing the reception-side to identify data types without direct feedback interaction between the terminals.
2Productivity
If the transmission-side user terminal transmits both initial transmission data and retransmission data using the same radio resource, then the resource utilization is improved, but the reception-side experiences uncertainty in data management
Solution Approach 1:
The reception-side user terminal performs preliminary configuration by storing the number of re-transmissions information before receiving data. This pre-knowledge enables the reception-side to systematically manage incoming data by comparing the received data type against the pre-configured re-transmission count, eliminating uncertainty in data management while maintaining efficient resource utilization.
Solution Approach 2:
The patent implements a form of feedback by having the reception-side use the pre-configured number of re-transmissions information to determine whether received data is initial transmission or retransmission. This internal feedback mechanism allows the reception-side to autonomously manage data without requiring external feedback from the transmission-side, simplifying data management while maintaining resource efficiency.
Data Source
AI summary
In the communication control method according to the present embodiment, a user terminal transmits a scheduling assignment indicating the location of a radio resource used in a reception of communication data by direct device-to-device communication. The user terminal transmits the communication data including initial transmission data and retransmission data by using the radio resource. The retransmission data is transmitted depending on the number of times of re-transmissions associated with a predetermined scheduling assignment by using a predetermined radio resource of which the location is indicated by the predetermined scheduling assignment.