Uplink Scheduling Around SSB Collisions in Multi-TRP Cells
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Solution Overview
Problem
In wireless communication systems, particularly in multi-TRP inter-cell configurations, there is a challenge in managing potential collisions between uplink transmissions and synchronization signal blocks (SSBs), leading to inefficiencies and limitations in simultaneous transmission and reception capabilities of user equipment (UEs).
Innovation Solution
The proposed solution involves techniques for detecting potential collisions between scheduled uplink transmissions and SSBs and allowing these transmissions to proceed under specific conditions, enabling flexible and intelligent transmission even when collisions are detected, thereby overcoming conventional restrictions on simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs refrain from transmitting when collision with SSB is detected, then interference between uplink transmission and SSB is avoided, but system efficiency and resource utilization deteriorate due to transmission interruptions
Solution Approach 1:
The patent changes the transmission parameter by allowing uplink transmissions to proceed despite detected SSB collisions under certain conditions. The network entity configures parameters indicating which SSBs are actually transmitted, enabling the UE to make informed decisions about transmission timing and resource allocation, thereby maintaining system efficiency while managing interference risks.
Solution Approach 2:
The patent introduces dynamic transmission management where the UE can switch between transmitting and refraining from transmitting based on real-time collision detection and configured conditions. This dynamic approach allows the system to adapt to varying channel conditions and traffic priorities, improving overall productivity while maintaining reliability when necessary.
2Productivity
If UEs always transmit scheduled uplink transmissions regardless of SSB collision, then system efficiency and resource utilization improve, but interference between uplink transmission and SSB deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the network entity provides configuration information to the UE about which SSBs are actually transmitted. The UE uses this feedback to detect potential collisions and make intelligent transmission decisions. This feedback loop enables the system to maximize resource utilization while avoiding harmful interference through informed transmission decisions.
Solution Approach 2:
The patent applies local quality by allowing transmissions in specific time-frequency resources where no collision occurs, while refraining from transmissions only in resources where collisions are detected. This localized approach ensures that interference is avoided only where necessary, maintaining high overall resource utilization without compromising system-wide interference management.
3Reliability
If UEs detect potential collision between uplink transmission and SSB, then interference management becomes possible, but transmission flexibility and priority handling deteriorate due to mandatory transmission refusal
Solution Approach 1:
The patent segments the SSB set into individual SSBs with specific transmission indicators. The network entity configures separate indication information for each SSB, allowing the UE to detect collisions on a per-SSB basis rather than blanket refusal. This segmentation enables flexible priority handling where high-priority transmissions can proceed even if lower-priority SSBs would collide, thereby maintaining both interference management and transmission flexibility.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for detecting a potential collision between a scheduled uplink transmission and a synchronization signal block (SSB) and transmitting the scheduled uplink transmission. For example, in cases of inter-cell multi-transmission and reception points (multi-TRP), a user equipment (UE) may not be capable of simultaneously transmitting and receiving on the multiple serving cells. A first serving cell may indicate to the UE of SSB indices that are actually transmitted for a second serving cell. If there is a slot collision between one of the SSB to be transmitted and a scheduled uplink transmission, the UE may not be able to handle such collision. The present disclosure provides techniques for detecting a potential collision between a scheduled uplink transmission and one of the SSBs and transmitting the scheduled uplink transmission when one or more conditions are met.