Secondary Cell Release via PUCCH Group Segmentation
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing multiple physical uplink control channel (PUCCH) groups, leading to high PUCCH load on primary cells and potential interference issues due to limited resource allocation and synchronization across secondary cells.
Innovation Solution
The implementation of multiple PUCCH groups, where cells are grouped to distribute CSI reports and HARQ feedbacks across primary and secondary cells, allowing for flexible PUCCH configuration and resource management, thereby reducing the load on primary cells and enhancing network capacity and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PUCCH groups are implemented to distribute control signaling, then the load on primary cells is reduced and network capacity is enhanced, but the device complexity and resource management overhead increase
Solution Approach 1:
The patent divides the control channel resources into multiple PUCCH groups, where each group is associated with specific secondary cells. This segmentation allows control signaling to be distributed across different groups rather than concentrated on primary cells, thereby reducing primary cell load while enhancing overall network capacity through parallel handling of multiple cell groups.
2Loss of energy
If secondary cells are released based on timing alignment timer expiration, then interference is reduced and resource efficiency is improved, but the risk of premature release and connection instability increases
Solution Approach 1:
The patent implements a feedback mechanism where the wireless device monitors timing alignment timer status and provides feedback to the network about the synchronization state of secondary cells. This feedback allows the network to make informed decisions about cell release, balancing resource efficiency with connection stability by avoiding premature release while maintaining uplink synchronization.
Solution Approach 2:
The patent performs preliminary actions by configuring multiple timing alignment timers for different cell groups before potential release scenarios occur. This preliminary configuration ensures that when release decisions are needed, the device already has the necessary timing alignment information and can execute releases smoothly without compromising connection stability.
3Object-affected harmful factors
If uplink transmissions are stopped when timing alignment timer expires, then interference is reduced, but the productivity and data transmission efficiency decrease
Solution Approach 1:
The patent segments uplink transmissions by cell group, allowing uplink transmissions to continue in cell groups that have valid timing alignment while stopping them only in groups where the timing alignment timer has expired. This selective approach reduces interference in affected groups while maintaining data transmission efficiency in groups that remain synchronized.
Data Source
AI summary
A wireless device receives configuration parameters of cells. The cells are grouped into a primary group comprising a primary cell, and a secondary group. The secondary group comprises first secondary cells. The first secondary cells comprise a physical uplink control channel (PUCCH) secondary cell with a secondary PUCCH. A channel quality indicator of a signal is transmitted via the secondary PUCCH. A message indicating a release of fewer secondary cells than the first secondary cells is received. The fewer secondary cells comprise the PUCCH secondary cell. The first secondary cells are released based on releasing the PUCCH secondary cell.