Semi-Persistent Scheduling Control for VoIP Resource Efficiency
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Solution Overview
Problem
Current mobile communication systems face inefficiencies in managing limited radio resources, particularly in Voice over Internet Protocol (VoIP) services, where resources are persistently allocated even during silence periods, leading to waste and reduced efficiency.
Innovation Solution
A method is introduced to dynamically manage radio resources by transitioning VoIP services from talk periods to silence periods, releasing resources during silence and reallocating them as needed, using dedicated scheduling requests, silence descriptors, and timers to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If persistent scheduling is used to allocate radio resources for VoIP service, then reliability of voice transmission is improved, but radio resource utilization efficiency deteriorates due to resources being allocated during silence periods
Solution Approach 1:
The patent applies dynamics by transitioning the scheduling scheme from static persistent scheduling to dynamic scheduling based on voice activity detection. The base station monitors whether the user is in talk or silence period and adjusts the scheduling mode accordingly, making the system adaptable to changing conditions rather than fixed in one mode
Solution Approach 2:
The patent changes the scheduling parameter dynamically based on voice activity state. During talk periods, persistent scheduling parameters are used to ensure reliable voice transmission, while during silence periods, the system switches to dynamic scheduling or releases resources to improve resource utilization efficiency
2Ease of operation
If radio resources are persistently allocated during silence periods, then ease of operation is improved by maintaining ready-to-use resources, but loss of energy increases due to unused allocated resources
Solution Approach 1:
The patent implements periodic action by releasing radio resources during silence periods and reallocating them when talk periods resume. This periodic release and reallocation pattern eliminates energy waste during silence while maintaining ease of operation through rapid reallocation when needed, using mechanisms like dedicated scheduling requests and timers
Data Source
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AI summary
A method of controlling a scheduling scheme, the method performed by a base station, BS, and comprising: transmitting first scheduling information including a first resource assignment and a first new data indicator, NDI, on a physical downlink control channel, PDCCH, to a user equipment, UE, to activate a semi-persistent scheduling, SPS, for a downlink data packet to be delivered to the UE with the first resource assignment, the first scheduling information being masked with a persistent Cell Radio Network Temporary Identifier, C-RNTI, associated with the SPS, the first NDI indicating a first value; and transmitting second scheduling information including a second resource assignment on the PDCCH from the BS, the second scheduling information being masked with the persistent C-RNTI associated with the SPS, wherein if the second scheduling information includes a second NDI, the second scheduling information is used for a retransmission downlink data packet with the second resource assignment, the second NDI indicating a second value.