Semi-Persistent Scheduling Collision Handling via MCS Aggregation
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Solution Overview
Problem
In wireless networks, semi-persistent scheduling collisions occur when user devices are allocated multiple SPS configurations with different modulation and coding schemes for the same transmission time interval, leading to inefficiencies in resource utilization and increased signaling overhead.
Innovation Solution
User devices select a modulation and coding scheme (MCS) from the colliding SPS configurations and transmit data using an aggregated set of resources, optimizing resource use and reducing signaling overhead by prioritizing SPS configurations based on Quality of Service parameters or other criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SPS configurations are allocated for different services, then service quality and resource allocation flexibility are improved, but collision occurs when configurations are scheduled for the same TTI
Solution Approach 1:
The system performs preliminary actions by determining SPS collisions in advance and pre-selecting a reference SPS configuration before the actual transmission time. This allows the user device to prepare the necessary control information and resource aggregation plans beforehand, resolving the collision issue proactively rather than reactively during transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station acts as a mediator to resolve SPS collisions. The base station determines which SPS configuration should be used as reference and provides control information to the user device, facilitating coordinated resource allocation across multiple SPS configurations without direct conflict.
2Productivity
If SPS configurations with different MCS are aggregated, then resource utilization efficiency is improved, but transmission reliability deteriorates due to MCS mismatch
Solution Approach 1:
The patent applies local quality by allowing different MCS values for different SPS configurations to be aggregated together, with each configuration maintaining its own optimized MCS parameters. The reference SPS configuration serves as a template for resource aggregation, while non-reference configurations contribute their specific MCS parameters, enabling localized optimization without requiring uniform MCS across all configurations.
Solution Approach 2:
The system changes the parameter approach by introducing a reference SPS configuration that defines the resource aggregation structure, while allowing other configurations to have different MCS parameters. This parameter change enables the system to maintain different coding schemes for different services while still achieving efficient resource utilization through the reference configuration framework.
3Reliability
If dynamic rescheduling is used to handle collisions, then transmission reliability is maintained, but signaling overhead increases
Solution Approach 1:
The system performs preliminary determination of SPS collisions and pre-selection of reference configurations before transmission time. This eliminates the need for dynamic rescheduling by resolving conflicts in advance, thereby maintaining transmission reliability while significantly reducing signaling overhead as no additional control information needs to be exchanged during transmission.
Solution Approach 2:
The patent enables self-service by allowing the user device to autonomously determine SPS collisions and select reference configurations based on pre-configured parameters. The device independently manages the collision resolution process without requiring continuous base station intervention or additional signaling, reducing overall system complexity and overhead.
Data Source
AI summary
A technique includes receiving, by a user device, a plurality of semi-persistent scheduling (SPS) configurations, each SPS configuration including an SPS identifier and an interval for each of the plurality of SPS configurations; receiving, by the user device, an SPS activation corresponding to each of the plurality of SPS configurations, each SPS activation indicating a set of resources and a modulation and coding scheme (MCS) to be used for transmission of data for the corresponding SPS configuration; determining, by the user device, that a collision will occur for the plurality of SPS configurations during a transmission time interval (TTI); selecting a MCS corresponding to one of the plurality of SPS configurations that have been determined to collide during the TTI; and transmitting, by the user device during the TTI, data using the selected MCS via an aggregated set of SPS resources that includes at least a portion of each of the sets of resources for the plurality of SPS configurations that have been determined to collide during the TTI.