Cross Carrier Scheduling Downlink Data Buffering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in cross carrier scheduling scenarios, there is a challenge in effectively buffering downlink data before successfully decoding control channels, leading to inconsistencies and potential data loss due to timing offsets between control channel reception and data channel transmission.
Innovation Solution
The method involves a user equipment (UE) receiving configurations for multiple serving cells and buffering downlink data using the Transmission Configuration Indication (TCI) state associated with the lowest CORESET-ID in the latest slot configured, ensuring data is buffered only after successful decoding of the control channel, thereby avoiding data loss and inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the UE buffers downlink data before successfully decoding the control channel, then data reception continuity is improved, but data loss and inconsistencies occur due to timing offsets between control channel reception and data channel transmission
Solution Approach 1:
The UE performs preliminary buffering of downlink data in the TCI state associated with the lowest CORESET-ID before control channel decoding is complete. This preliminary action ensures that data is ready to be processed immediately upon successful decoding, maintaining reception continuity while avoiding data loss by using a predetermined safe buffering location.
Solution Approach 2:
The TCI state associated with the lowest CORESET-ID acts as an intermediary buffering location between the control channel and data channel. This intermediary state allows the UE to temporarily hold downlink data in a known, consistent location until control channel decoding is complete, resolving the timing offset issue without causing data loss.
2Stability of the object's composition
If the UE uses TCI state from the latest slot with lowest CORESET-ID for buffering, then buffering consistency is improved, but timing synchronization complexity increases
Solution Approach 1:
The patent changes the parameter used for buffering from a dynamic timing-based approach to a static TCI state-based approach. By using the TCI state associated with the lowest CORESET-ID from the latest slot, the patent transforms the buffering mechanism into a more consistent and predictable operation, reducing timing synchronization complexity while maintaining buffering consistency.
Data Source
AI summary
Methods and apparatuses for downlink data buffering considering cross carrier scheduling in a wireless communication system. The UE receives configuration of a first serving cell and a second serving cell from a network and receives and/or monitors a first PDCCH transmitted on the second serving cell, wherein the first PDCCH schedules a first PDSCH. The UE receives and/or monitors a second PDCCH transmitted on the second serving cell, receives and/or buffers the second PDSCH based on a first TCI state used for PDCCH quasi co-location indication of a CORESET, and receives and/or buffers the first PDSCH based on a second TCI state.