Transport Block HARQ-ACK Across TCI-Linked Timing Advance Groups
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple timing advance groups, leading to suboptimal resource allocation and increased latency in data transmission.
Innovation Solution
Implementing a mechanism for managing multiple timing advance groups, including configurations and management of time alignment timers, to optimize resource allocation and reduce latency in wireless communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple timing advance groups are managed using existing mechanisms, then resource allocation can be performed, but resource allocation efficiency is suboptimal and latency increases
Solution Approach 1:
The patent segments the timing advance management by introducing separate time alignment timers for each timing advance group (TAC-1 timer for first TA group, TAC-2 timer for second TA group). This segmentation allows independent management of timing advances for different uplink carriers, enabling more efficient resource allocation and reducing latency by avoiding wait-for-release mechanisms.
2Productivity
If existing timing advance management mechanisms are used, then system complexity is maintained, but resource allocation and latency performance deteriorate
Solution Approach 1:
The patent introduces dynamic timer management where TAC-1 and TAC-2 timers can be independently configured and managed for different timing advance groups. The network can dynamically start, stop, and reset these timers based on uplink scheduling needs, allowing flexible adaptation to varying traffic conditions while maintaining efficient resource allocation.
Solution Approach 2:
The patent changes the timing management parameters by introducing separate time alignment timer values (TAC-1 and TAC-2) for different timing advance groups. These timer parameters can be independently configured by the network, allowing optimization of resource allocation efficiency and latency performance by adjusting timer durations based on specific service requirements.
Data Source
AI summary
A wireless device receives one or more messages indicating: at least two timing advance groups (TAGs) for a cell, and an uplink resource of a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback. Each TAG of the at least two TAGs is associated with a respective transmission configuration indicator (TCI) state. A wireless device receives a downlink reception comprising a transport block (TB). The wireless device instructs a physical layer, of the wireless device, to generate an acknowledgement for the TB in response to a time alignment timer of a TAG, among the at least two TAGs and associated with a TCI state used for transmitting the HARQ-ACK feedback, being running. The wireless device transmits, via the cell and based on the TCI state, the HARQ-ACK feedback comprising the acknowledgement.