Multi-Periodicity SPS Allocation for TDD VoIP Resource Conflicts
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Solution Overview
Problem
In E-UTRAN systems with TDD, there is a need to support VoIP services with predetermined timing requirements while avoiding collisions with retransmission requests without additional higher-layer communications or burdening radio resources, especially in scenarios where semi-persistent scheduling is used for VoIP packets.
Innovation Solution
A communication terminal, such as a UE, determines the periodicity for multiple periodicity SPS allocation using implicit rules to calculate delta values for forming periodic patterns, which depend on TDD configuration, HARQ processes, and system frame numbers, allowing for efficient resource allocation without additional control channel signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semi-persistent scheduling is used for VoIP packets in TDD systems, then quality of service for VoIP is maintained, but resource conflicts with HARQ retransmissions occur
Solution Approach 1:
The patent segments the scheduling into two distinct periodicities: one for VoIP packets (semi-persistent scheduling) and another for HARQ retransmissions. By dividing the resource allocation into separate periodic patterns, the system avoids conflicts between VoIP traffic and retransmission requests, allowing both to coexist without interference.
Solution Approach 2:
The patent implements multiple periodic patterns with different periods for different scheduling purposes. The first periodicity is configured for VoIP packet transmissions while the second periodicity handles HARQ retransmissions. This periodic action with differentiated timing ensures that VoIP and HARQ operations occur at distinct time intervals, preventing resource conflicts.
2Object-generated harmful factors
If multiple periodicity SPS allocation is implemented, then resource conflicts are reduced, but signaling requirements increase
Solution Approach 1:
The patent enables the user equipment to autonomously determine the second periodicity based on the first periodicity and predefined relationships. The UE calculates the second periodicity pattern without requiring explicit network signaling, thereby reducing control channel overhead while maintaining multiple periodicity benefits for conflict avoidance.
Solution Approach 2:
The patent changes the periodicity parameter dynamically by establishing a mathematical relationship between the first and second periodicities. The second periodicity is derived as a multiple or function of the first periodicity, allowing the system to adapt resource allocation patterns without additional signaling messages, thus reducing information loss and overhead.
3Loss of information
If implicit rules are used to determine periodicity, then additional control channel signaling is avoided, but complexity in determining delta values increases
Solution Approach 1:
The patent uses the first periodicity pattern as a template to generate the second periodicity pattern through copying and scaling. The UE copies the first periodicity configuration and applies a predefined multiplier or transformation to derive the second periodicity, simplifying the calculation process while avoiding additional signaling overhead.
Solution Approach 2:
The patent creates a universal relationship between the two periodicities that can be applied across different scenarios. The same implicit rule and delta value calculation method works for various TDD configurations and HARQ processes, reducing the need for scenario-specific complexity while maintaining flexibility in resource allocation.
Data Source
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AI summary
Systems and methods for determining the periodicity for a multiple periodicity SPS allocation using implicit rules for a TDD communications system are disclosed. A communication terminal such as a UE is provided that may determine the periodicity for a multiple periodicity SPS allocation using implicit rules to calculate a delta value to form a long time period and a shorter time period, forming a periodic pattern where the rules depend on the TDD configuration being used. In another embodiment a communication terminal such as a UE is provided that may determine the periodicity for a multiple periodicity SPS allocation using implicit rules to calculate a delta value to form a long time period and a shorter time period forming a periodic pattern, where the rules depend on the TDD configuration being used and the HARQ process being used.