Uplink Data Transmission Using Retransmission Resources
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Solution Overview
Problem
In wireless communication systems, there is a delay in transmitting urgent data due to the HARQ retransmission process, where user equipment (UE) needs to wait for previous data retransmission to complete before allocating resources for new urgent data, leading to potential long delays, especially when the maximum retransmission count is reached.
Innovation Solution
A method is introduced where the user equipment (UE) transmits control information indicating whether the uplink data is a retransmission or new data, using the allocated retransmission resource, allowing for immediate transmission of urgent data by preempting the resource and including this information in the MAC packet data unit (PDU) with a PHY header, which is mapped to specific resource elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ retransmission resource is used for urgent data transmission, then resource utilization is improved, but HARQ process reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining NDI value rules before transmission occurs. When urgent data needs to be sent on retransmission resources, the UE can immediately determine the NDI value based on pre-established rules (e.g., NDI=0 for retransmission, NDI=1 for new data), eliminating the need for real-time negotiation and enabling immediate transmission without compromising HARQ process reliability
Solution Approach 2:
The patent introduces NDI (New Data Indicator) as an intermediary signal to mediate between retransmission resources and urgent data transmission. The NDI value acts as a flag that tells the base station whether the transmitted data is a retransmission or new urgent data, allowing the system to maintain HARQ process reliability while enabling flexible resource utilization
2Reliability
If new resource allocation is performed for urgent data, then data transmission accuracy is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource allocation rules for urgent data transmission. When urgent data arrives, the UE can immediately use pre-allocated retransmission resources with pre-defined NDI rules, avoiding the time-consuming process of new resource allocation while maintaining transmission accuracy through proper NDI signaling
Solution Approach 2:
The patent enables skipping the conventional resource allocation process for urgent data by allowing direct transmission on retransmission resources. The NDI mechanism allows the system to rush through the transmission process immediately without waiting for new resource allocation, reducing delay from 32ms to 1-3ms while maintaining accuracy through proper NDI indication
3Speed
If control information is transmitted through MAC PDU with PHY header, then transmission speed is improved, but system complexity increases
Solution Approach 1:
The patent merges control information (NDI) with data transmission by embedding it in the MAC PDU structure. The NDI is transmitted as part of the MAC PDU header rather than as a separate control channel, combining control and data transmission into a single operation. This increases transmission speed by reducing overhead while the standardized MAC PDU structure keeps system complexity manageable
Solution Approach 2:
The patent makes the MAC PDU structure multi-functional by using it to carry both data and control information (NDI). The same MAC PDU that carries user data also conveys the NDI, eliminating the need for separate control signaling and improving transmission efficiency. The universal MAC PDU structure handles both functions without significantly increasing system complexity
Data Source
AI summary
The present description provides a method for transmitting and receiving uplink (UL) data in a wireless communication system. A method, which is carried out by means of a terminal, comprises the steps of: receiving a first uplink grant from a base station; transmitting, on the basis of the first uplink grant, first uplink data to the base station; receiving an HARQ response to the first uplink data from the base station; transmitting second uplink data to the base station by means of retransmission resources allocated for the retransmission of the first uplink data; and transmitting, to the base station, control information which indicates whether the second uplink data is retransmission data of the first uplink data or new data generated by means of a particular event.