UE SPS Configuration Switching for Timing Drifts
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Solution Overview
Problem
Wireless communications face challenges due to timing drifts between wireless networks and user equipment (UE), leading to undesired 'holes' in communication, especially in URLLC applications where synchronization is critical.
Innovation Solution
The UE employs a jitter determiner to assess the delay between data packet arrival and transmission, allowing it to dynamically switch between active configurations to ensure timely data transmission, thereby mitigating the effects of timing drifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SPS is used with fixed scheduling, then resource allocation is simplified, but timing drifts cause data packets to be transmitted too late creating communication holes
Solution Approach 1:
The patent applies dynamics by enabling the UE to dynamically switch between multiple active SPS configurations based on timing drift conditions. Instead of being fixed to a single configuration, the UE can transition between configurations with different time offsets to accommodate timing variations and ensure timely packet transmission.
Solution Approach 2:
The patent changes the parameter of active configuration selection based on timing drift measurements. The UE monitors timing differences and selects appropriate SPS configurations with different time offsets (e.g., first time offset, second time offset) to compensate for drift and maintain reliable communication.
2Reliability
If multiple active configurations are introduced to handle timing drifts, then communication reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the SPS configuration into multiple active configurations, each with specific time offsets. This segmentation allows the system to handle different timing scenarios separately, improving reliability while managing complexity through structured organization of configurations.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors timing drifts and uses this information to select appropriate active configurations. The feedback loop ensures that the system adapts to timing variations and maintains reliable communication by choosing configurations that compensate for observed drift conditions.
3Measurement precision
If timing synchronization is strictly enforced, then communication precision is maintained, but timing drifts cause data packets to be lost
Solution Approach 1:
The patent applies beforehand cushioning by pre-configuring multiple SPS configurations with different time offsets to compensate for anticipated timing drifts. This preparation ensures that when timing drift occurs, the system already has alternative configurations ready to prevent packet loss.
Solution Approach 2:
The patent uses time offset adjustments as an intermediary mechanism between strict timing synchronization and timing drift compensation. By introducing configurable time offsets as an intermediate parameter, the system can bridge the gap between maintaining precision and accommodating drift without losing packets.
Data Source
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Figure 2
Figure 2.1.1~2.1.2
AI summary
There are disclosed methods, systems and devices for communications. For example, a user equipment, UE, (100) may: receive data packets (122, 126); transmit the data packets (142) according to a scheduling which allocates transmission resources in a determined time period; determine a delay or jitter information (146) between the reception of a data packet (122, 126) in the buffer (102) and the transmission of the data packet; and modify the transmission configuration to switch from a first active configuration to a second active configuration.