SPS HARQ Deferral Under Dynamic SSB Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems, dynamic adaptation of synchronization signal blocks (SSBs) for network energy saving can cause collisions with semi-persistent scheduling (SPS) Hybrid Automatic Repeat Request (HARQ) messages, leading to deferred transmissions and increased latency.
Innovation Solution
Implementing rules for SPS HARQ deferral during dynamic SSB adaptation to avoid collisions, allowing for flexible scheduling and reducing latency by deferring SPS HARQ messages when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dynamic adaptation of SSBs is implemented for network energy saving, then energy consumption is reduced, but collisions with SPS HARQ messages occur causing increased latency
Solution Approach 1:
The network entity performs preliminary actions by evaluating whether to adapt SSB transmissions before actual transmissions occur. The UE is configured with SPS HARQ deferral parameters in advance, enabling it to preemptively defer HARQ messages when SSB adaptations are scheduled, preventing collisions before they occur and reducing latency.
Solution Approach 2:
The system implements dynamic scheduling where the network entity can adaptively adjust SSB transmission patterns based on traffic conditions and energy requirements. The SPS HARQ deferral mechanism dynamically adjusts timing based on received messages from the network entity, allowing flexible coordination between energy-saving adaptations and reliable communication.
2Loss of energy
If SSB transmissions are adapted dynamically, then network energy efficiency improves, but communication reliability deteriorates due to message collisions
Solution Approach 1:
The SPS HARQ deferral mechanism acts as an intermediary between SSB transmissions and HARQ message transmissions. When the network entity sends adaptation messages, the UE uses these as intermediate signals to adjust its HARQ timing, preventing direct collisions between SSB and HARQ messages while maintaining both functions.
Solution Approach 2:
The network entity provides feedback through messages that inform the UE about upcoming SSB adaptations. The UE uses this feedback to adjust its HARQ message timing accordingly, creating a closed-loop system that maintains reliability while enabling energy-saving adaptations.
3Object-affected harmful factors
If SPS HARQ messages are deferred to avoid collisions, then collision rate decreases, but scheduling flexibility is reduced
Solution Approach 1:
The system changes the timing parameter of HARQ message transmissions dynamically based on received network messages. Instead of fixed scheduling, the UE adjusts transmission timing by deferring messages when needed, changing the temporal parameters of communication to avoid collisions while maintaining overall scheduling flexibility.
Data Source
AI summary
Some examples of the techniques described herein may provide approaches for managing cases of dynamic downlink signal adaptation. For instance, one or more rules may be utilized for semi-persistent scheduling (SPS) hybrid automatic repeat request (HARQ) deferral under dynamic synchronization signal block (SSB) adaptation. In some examples, a UE may determine whether a HARQ message will be deferred due to the SSB before the SSB transmission. With dynamic adaptation, various scenarios may occur. In an example, an existing SSB may be adapted by removal. Accordingly, the SPS HARQ may not collide with the SSB after adaptation, making the previously scheduled uplink resource available for transmission. In another example, the SSB adaptation may add an SSB that collides with SPS HARQ. The UE may defer transmission of the SPS HARQ in this case. For instance, an SPS HARQ message may be deferred under dynamic SSB adaptation to avoid collisions.