Uplink Scheduling Using Terminal Packet Delay Feedback
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Solution Overview
Problem
Base stations cannot accurately control uplink scheduling due to a lack of knowledge about the delay time of IP packets in terminals, as only data size is reported, not the actual delay time, leading to inefficient resource allocation.
Innovation Solution
Terminals measure the elapsed time from packet reception to transmission and report this delay time to the base station, allowing the base station to schedule uplink resources based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station allocates radio resources based only on data size notification from the terminal, then the scheduling process is simple, but the base station cannot recognize the delay time of IP packets and cannot appropriately control scheduling according to the allowable delay
Solution Approach 1:
The terminal measures the elapsed time from packet reception to uplink transmission and feeds back this delay time information to the base station. This feedback mechanism enables the base station to recognize the actual delay time of IP packets in the terminal, allowing appropriate scheduling control according to the allowable delay specified in QCI parameters.
Solution Approach 2:
The delay time information acts as an intermediary parameter that bridges the terminal and base station. By introducing this intermediate information element, the base station can indirectly obtain knowledge about packet delay status without directly monitoring terminal buffer operations, enabling improved scheduling decisions.
2Quantity of substance
If the terminal reports only data size of each LCG to the base station, then the reporting overhead is reduced, but the base station cannot recognize the delay time of IP packets
Solution Approach 1:
Instead of reporting all possible parameters (data size, delay time, packet count, etc.), the terminal selectively reports only the delay time information that is most critical for scheduling decisions. This partial reporting approach adds minimal overhead while providing the specific information needed for delay-aware scheduling.
3Device complexity
If the base station uses delay-related information compared with a delay threshold, then the scheduling control is simplified, but the base station cannot recognize the detailed delay time of IP packets
Solution Approach 1:
The base station dynamically adjusts scheduling decisions based on the actual delay time values received from the terminal, rather than using fixed threshold comparisons. This dynamic approach allows the scheduler to adapt resource allocation to the specific delay characteristics of each packet, optimizing both latency performance and resource efficiency.
Data Source
AI summary
A base station apparatus appropriately controls scheduling of an uplink. A terminal apparatus includes measuring means for measuring an elapsed time from when a packet is received from a higher layer to when the uplink data is transmitted to the base station apparatus by using the radio resource for the uplink, and transmitting means for transmits the measured elapsed time to the base station apparatus as a delay time.