Dynamic SPS Reconfiguration for Wireless Network Signaling
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Solution Overview
Problem
In LTE networks, dynamic scheduling for voice traffic results in high signaling overhead due to small payload sizes, and existing Semi-Persistent Scheduling (SPS) methods struggle to adjust for varying packet sizes and transitions between talk spurts and silence intervals, leading to inefficient resource utilization and potential transmission failures.
Innovation Solution
The method involves reconfiguring uplink and downlink SPS by modifying time-interval parameters and resource block allocations based on user device requests, accommodating packet-size changes and optimizing channel status report timing to improve resource allocation and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for voice traffic in LTE networks, then scheduling flexibility is improved, but signaling overhead increases due to small payload sizes
Solution Approach 1:
The patent implements dynamic SPS reconfiguration where the time-interval parameter can be adjusted based on traffic conditions. The system transitions from static SPS to a dynamic configuration that adapts to varying voice traffic patterns, allowing the scheduling interval to be modified without establishing new SPS configurations, thereby reducing signaling overhead while maintaining flexibility.
Solution Approach 2:
The patent changes the time-interval parameter of existing SPS configurations dynamically. By modifying this key parameter based on traffic conditions (talk spurt vs. silence interval), the system achieves adaptability without the overhead of complete reconfiguration, directly addressing the contradiction between flexibility and signaling overhead.
2Loss of information
If fixed SPS configuration is used, then signaling overhead is reduced, but resource utilization efficiency deteriorates due to inability to adjust for varying packet sizes
Solution Approach 1:
The patent introduces dynamic reconfiguration capability to existing SPS configurations by allowing modification of the time-interval parameter. This transforms fixed SPS into a dynamic system that can adapt to varying packet sizes and traffic conditions, improving resource utilization without incurring the overhead of complete reconfiguration.
Solution Approach 2:
The patent makes the SPS configuration multi-functional by enabling it to serve different packet size requirements through parameter modification. The same SPS configuration can adapt to various traffic conditions (voice, data, mixed traffic) by changing the time-interval parameter, eliminating the need for multiple fixed configurations.
3Device complexity
If SPS time-interval is kept constant, then configuration complexity is reduced, but transmission reliability deteriorates during transitions between talk spurts and silence intervals
Solution Approach 1:
The patent implements dynamic adjustment of the time-interval parameter based on detected traffic conditions. During talk spurts, the interval is optimized for voice packets, while during silence intervals, it is adjusted to accommodate data transmissions, thereby maintaining transmission reliability without significantly increasing configuration complexity.
Solution Approach 2:
The system uses feedback from traffic condition detection (identifying talk spurt vs. silence interval states) to dynamically adjust the time-interval parameter. This feedback mechanism ensures transmission reliability by adapting to actual traffic conditions while keeping the control logic relatively simple.
Data Source
AI summary
In one embodiment, a method is performed by a base station in a wireless network. The method includes receiving from a user device a request to reconfigure already-active uplink semi-persistent scheduling (SPS). The already-active uplink SPS grants the user device a resource block allocation (RBA) and a modulation and coding scheme (MCS) for periodic uplink transmissions. The already-active uplink SPS includes a time-interval parameter, the time-interval parameter specifying a time interval between the periodic uplink transmissions. The request includes information related to a proposed adjustment of the time-interval parameter. The method further includes reconfiguring the already-active uplink SPS. The reconfiguring includes modifying the time-interval parameter based, at least in part, on the information.