Deactivating Semi-Persistent CSI Reports Upon Sync Loss
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and 5G networks, there is a risk of collisions between user equipment (UE) devices when they transition from an in-sync to an out-of-sync state, leading to resource allocation conflicts on shared channels like PUSCH, as existing techniques fail to efficiently manage semi-persistent CSI reporting.
Innovation Solution
The UE is configured to automatically deactivate all configured SP-CSI reports on PUSCH upon entering an out-of-sync state, releasing resources and preventing potential collisions by re-entering the in-sync state through a random access channel procedure, thus allowing the network to safely reallocate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to transmit semi-persistent CSI reports on PUSCH after entering out-of-sync state, then the resource allocation remains consistent and simple to manage, but uplink transmission collisions occur and resource allocation efficiency deteriorates
Solution Approach 1:
The UE proactively deactivates all configured SP-CSI reports on PUSCH upon entering the out-of-sync state, before any collision can occur. This preliminary action prevents uplink transmission conflicts by ensuring that no CSI reports are transmitted when the UE is out of synchronization, while the network can subsequently reallocate these resources to other UEs
Solution Approach 2:
The system implements feedback through synchronization state monitoring where the UE continuously monitors its synchronization state and provides implicit feedback by deactivating SP-CSI reports when out-of-sync conditions are detected. This feedback mechanism ensures that the network can reallocate resources efficiently based on the UE's actual synchronization status
2Productivity
If the network reallocates resources immediately upon UE entering out-of-sync state, then resource allocation efficiency improves, but the risk of transmission conflicts increases if the UE re-enters in-sync state without proper deactivation
Solution Approach 1:
The UE performs preliminary deactivation of SP-CSI reports upon entering out-of-sync state, ensuring that resources are cleared before the network reallocates them. This prevents any potential transmission conflicts while enabling the network to safely and efficiently reallocate the freed resources to other UEs
Solution Approach 2:
The UE autonomously manages its own SP-CSI report deactivation based on its synchronization state, without requiring explicit network commands. This self-service approach allows the network to reallocate resources efficiently while the UE independently ensures that no conflicts occur by deactivating reports when out-of-sync
Data Source
AI summary
Techniques are disclosed relating to reporting channel state information (CSI) when synchronization state is altered. In some embodiments, a UE starts a timing alignment timer (TAT) in response to a time alignment command (TAC) from a cellular network for one or more serving cells. In some embodiments, the UE stores a configuration for a semi-persistent (SP) channel state information (CSI) report for the apparatus over a physical uplink shared channel (PUSCH). In some embodiments, the UE activates the SP-CSI report based on downlink control information (DCI) from the network. In some embodiments, the UE transmits one or more SP-CSI reports according to the configuration. In some embodiments, in response to expiration of the TAT, the UE deactivates all active stored configurations of SP-CSI reports that use the PUSCH and that correspond to the one or more serving cells. In some embodiments, this may avoid collisions with PUSCH transmissions from other UEs, e.g., when the UE returns to an in-sync state.