Uplink BAT Reporting for Low-Latency Resource Allocation
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Solution Overview
Problem
Base stations struggle to promptly allocate transmission resources for ultra-reliable low-latency communication (URLLC) due to significant burst arrival time (BAT) drift of uplink service data packets from user equipments (UEs), leading to increased latency in waiting for transmission resources.
Innovation Solution
A communication method that allows the base station to accurately determine the BAT of uplink service data packets by using the uplink or downlink frame boundary and timing advance (TA) of the terminal device, enabling timely resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station waits for uplink service data packets to arrive at the air interface, then transmission resources can be allocated, but significant BAT drift occurs causing increased latency
Solution Approach 1:
The terminal device calculates and reports the expected BAT before the actual packet arrival. The base station receives this advance information and proactively allocates transmission resources in advance, eliminating the waiting period and reducing latency while ensuring reliable resource allocation.
2Loss of information
If the base station uses traditional BAT detection methods, then BAT information can be obtained, but the network device cannot track accurate TA value causing BAT drift
Solution Approach 1:
The terminal device feeds back the expected BAT calculation based on its local frame boundary and TA value to the base station. This feedback mechanism allows the base station to obtain accurate BAT information without requiring the network to track the TA value, resolving the measurement precision issue while maintaining information completeness.
3Loss of time
If the terminal device reports BAT based on uplink frame boundary, then the base station can be promptly informed of BAT, but frame boundary alignment issues exist between terminal and network
Solution Approach 1:
The terminal device acts as an intermediary that translates its local frame boundary and TA value into an expected BAT representation that the base station can understand and use. This intermediary conversion allows prompt BAT notification without requiring direct frame boundary alignment between the terminal and network, resolving the alignment stability issue while achieving time reduction.
Data Source
AI summary
A communication method and a related apparatus are provided. The method includes: receiving first information from a network device, where the first information is used to request a first burst arrival time BAT corresponding to a first uplink service; and sending second information to the network device, where the second information includes information about the first BAT, and the first BAT is determined based on an uplink frame boundary of a terminal device. In the method, the first BAT determined by using the uplink frame boundary of the terminal device as a reference is reported to the network device, so that the network device can be promptly aware of the burst arrival time of data packets of the first uplink service of the terminal device. This reduces a latency of waiting for transmission resources by the uplink service data packets, and meets low-latency requirements.