Multiple Uplink SPS Configurations for Adaptive V2X Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing carrier aggregation and semi-persistent scheduling for vehicle-to-vehicle (V2V) communication, particularly in scenarios involving multiple carriers and varying traffic conditions.
Innovation Solution
Implementing mechanisms for carrier aggregation and semi-persistent scheduling in LTE and 5G systems, including dynamic modulation and coding schemes, and configuring secondary cells with PUCCH resources to offload PUCCH load from the primary cell, while utilizing RRC signaling for timing advance group management and activation/deactivation of secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented with multiple carriers for V2V communication, then network capacity and communication performance are improved, but system complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the V2V communication system by introducing separate timing advance groups (TAGs) for different carriers. Each TAG can be independently managed with its own timing advance parameters, allowing the system to handle multiple carriers without requiring complete reconfiguration of the entire system. This segmentation reduces the complexity of managing carrier aggregation by breaking it into manageable, independent units.
Solution Approach 2:
The patent implements preliminary configuration of SPS parameters including timing advance group associations before actual V2V communication begins. The base station pre-configures multiple TAGs and their associated carriers, so that when carrier aggregation is activated, the system is already prepared with the necessary timing relationships and resource allocations, reducing real-time management complexity.
2Productivity
If semi-persistent scheduling is used for V2V communication, then resource allocation efficiency is improved, but flexibility in adapting to varying traffic conditions deteriorates
Solution Approach 1:
The patent introduces dynamic activation and deactivation mechanisms for SPS configurations through MAC control elements. While SPS provides persistent resource allocation for efficiency, the system can dynamically activate or deactivate specific SPS configurations based on current V2V traffic conditions. This dynamic control allows the system to maintain high resource allocation efficiency while adapting flexibly to varying traffic demands.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors V2V traffic conditions and adjusts SPS activation states accordingly. When traffic patterns change, the base station can send MAC control elements to activate or deactivate appropriate SPS configurations, ensuring that resource allocation remains efficient for active communications while freeing resources when traffic diminishes.
3Ease of operation
If secondary cells are configured with PUCCH resources to offload load from primary cell, then primary cell load is reduced, but device complexity and signaling overhead increase
Solution Approach 1:
The patent extracts the PUCCH function from the primary cell and relocates it to secondary cells through configured associations. Specifically, the system configures SPS occasions to be associated with particular TAGs, and PUCCH resources are allocated on the carrier within the TAG rather than always on the primary cell. This extraction reduces primary cell load while the standardized association rules keep device complexity manageable.
Solution Approach 2:
The patent introduces timing advance groups as intermediaries between carriers and PUCCH resources. Instead of directly managing PUCCH allocation across multiple carriers, the system uses TAGs as intermediary structures that group carriers with similar timing characteristics. This intermediary layer simplifies the management complexity by providing a structured approach to PUCCH resource allocation across aggregated carriers.
4Adaptability or versatility
If multiple SPS configurations are activated simultaneously for different V2X services, then service diversity and communication versatility are improved, but uplink transmission conflicts and resource management complexity increase
Solution Approach 1:
The patent segments multiple SPS configurations into separate timing advance groups to prevent uplink transmission conflicts. Each SPS configuration is associated with a specific TAG, and the system ensures that configurations within the same TAG have non-overlapping uplink transmissions. This segmentation allows diverse V2X services to operate simultaneously while maintaining clear resource separation, managing complexity through structured organization rather than monolithic resource management.
Data Source
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AI summary
A base station receives, from a wireless device, at least one first message comprising a parameter indicating whether the wireless device supports multiple uplink semi persistent scheduling (SPS) configurations for V2X communications. At least one second message is transmitted by the base station based on the parameter indicates support of the multiple uplink SPS configurations. The at least one second message comprises: an uplink SPS radio network temporary identifier (RNTI), at least one uplink SPS configuration parameter, and an SPS configuration index for the at least one uplink SPS configuration parameter. A downlink control information (DCI) corresponding to the uplink SPS RNTI is transmitted. The DCI comprises the SPS configuration index. One or more transport blocks are received employing the at least one uplink SPS configuration parameter.