Single-Carrier SRS/SRI Scheduling for Slot Conflict Resolution
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Solution Overview
Problem
In wireless cellular communication networks, particularly in LTE systems, the simultaneous allocation of SRS (Sounding Reference Signal) and SRI (Scheduling Request Indicator) in single carrier systems can lead to conflicts due to their non-integer periodicity, resulting in the need to drop one signal, which is inefficient when SRI transmission is not pending.
Innovation Solution
Implementing a method where SRS and SRI are transmitted in separate slots or one SRI symbol is punctured to accommodate SRS transmission, with configuration options for NodeBs to manage these conflicts through control signaling, ensuring both signals are transmitted when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS and SRI are allocated with non-integer periodicity, then the system can flexibly adapt to different transmission needs, but conflicts arise when both signals are allocated in the same slot
Solution Approach 1:
The patent implements dynamic conflict resolution by introducing a configuration parameter that allows the system to adaptively choose between different transmission modes (drop SRS, drop SRI, or puncture) based on real-time conditions. This dynamic approach resolves the contradiction by making the system flexible enough to handle non-integer periodicity allocations while providing mechanisms to prevent harmful signal conflicts when they occur.
Solution Approach 2:
The patent changes the parameter of signal allocation by introducing configurable parameters that control the behavior of SRS and SRI transmissions. By modifying these parameters dynamically, the system can adjust the periodicity and timing of signal transmissions to avoid conflicts, thus maintaining adaptability while preventing harmful interference between signals.
2Object-generated harmful factors
If SRI is dropped to avoid conflict with SRS, then signal conflict is avoided, but network efficiency decreases when SRI transmission is pending
Solution Approach 1:
The patent implements dynamic decision-making for SRI transmission by introducing configuration parameters that allow the system to choose between dropping SRI or puncturing SRS based on real-time conditions. When SRI transmission is pending and the configuration allows, the system dynamically switches to puncturing mode rather than dropping SRI, thus maintaining network efficiency while still avoiding signal conflicts through intelligent resource management.
Solution Approach 2:
The patent introduces a configuration parameter as an intermediary that mediates between SRS and SRI transmissions. This intermediary controls the behavior of both signals based on system state, allowing the network to optimize efficiency by selecting appropriate transmission modes (drop or puncture) rather than always dropping SRI, thus resolving the contradiction between conflict avoidance and efficiency maintenance.
3Productivity
If SRS is punctured to accommodate SRI transmission, then both signals can be transmitted, but device complexity increases due to additional control signaling
Solution Approach 1:
The patent segments the control mechanism by separating the configuration parameter from the actual transmission logic. The configuration parameter is set semi-statically through RRC signaling, while the actual transmission decisions are made based on simpler dynamic conditions. This segmentation reduces device complexity by dividing the complex control task into manageable parts with different levels of sophistication.
Solution Approach 2:
The patent applies preliminary action by configuring the transmission behavior in advance through semi-static RRC parameters. This preliminary configuration establishes the rules for SRS puncturing before actual transmissions occur, reducing the complexity of real-time decision-making. The system only needs to evaluate simple conditions during transmission rather than making complex decisions on the fly, thus reducing device complexity while maintaining transmission efficiency.
Data Source
AI summary
A transmission of information from a secondary to a primary node occurs in a plurality of transmission instances which are logical time durations. A secondary node receives an allocation of periodic transmission instances for a scheduling request indicator (SRI) and an allocation if periodic transmission instances for a sounding reference signal (SRS). In a particular transmission instance allocated for the transmission of both SRS and SRI, the secondary node transmits the SRS without transmitting the SRI if a scheduling request is not pending; otherwise, the secondary node transmits at least the SRI.