Wireless Access Negotiation for Real-Time Latency and Jitter
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Solution Overview
Problem
Existing wireless communication protocols like EDCA do not adequately address the absolute latency and jitter requirements of real-time applications such as network games and industrial robots, making it difficult to ensure their availability and control.
Innovation Solution
A terminal apparatus and base station system that includes data processing units and wireless signal processing units to generate frames inquiring about and negotiating communication requirements, allowing for prioritization of real-time applications through enhanced channel access schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EDCA priority control scheme is used, then relative priority among traffic categories is achieved, but absolute latency and jitter requirements of real-time applications cannot be guaranteed
Solution Approach 1:
The terminal apparatus performs preliminary negotiation with the base station before actual data transmission, exchanging negotiation frames that specify absolute latency and jitter requirements. This preliminary action allows the base station to pre-configure access parameters and transmission opportunities, ensuring real-time application requirements are met before traffic begins flowing.
Solution Approach 2:
The system dynamically adjusts transmission parameters based on negotiated requirements. The base station modifies access parameters such as contention window sizes, transmission opportunity limits, and priority levels according to the specific latency and jitter requirements communicated in negotiation frames, enabling adaptive control that satisfies varying real-time application needs.
2Adaptability or versatility
If traditional CSMA/CA channel access is used, then simple channel sharing is achieved, but real-time application availability cannot be controlled
Solution Approach 1:
The negotiation framework establishes a feedback mechanism where terminals communicate their real-time application requirements to the base station, and the base station responds with configured access parameters. This feedback loop enables the system to adapt channel access control to specific application needs while maintaining operational simplicity through automated parameter exchange.
Solution Approach 2:
The system changes access parameters such as contention window minimum and maximum values, inter-frame spaces, and transmission opportunity limits based on negotiated requirements. By dynamically adjusting these parameters for different access categories, the system achieves adaptable real-time application support while keeping the basic CSMA/CA operation simple.
3Reliability
If access parameters are allocated for multiple access categories, then relative priority transmission is enabled, but absolute latency guarantees for real-time applications are not achieved
Solution Approach 1:
Access parameter configuration is performed as a preliminary negotiation action before data transmission begins. The terminal specifies its absolute latency and jitter requirements in a negotiation frame, and the base station pre-calculates and configures the appropriate access parameters, eliminating the need for complex real-time parameter adjustment during active transmission.
Solution Approach 2:
The access control mechanism is segmented into distinct phases: negotiation phase where requirements are exchanged and parameters are determined, and transmission phase where pre-configured parameters are applied. This segmentation simplifies parameter management by separating the complex parameter determination logic from the straightforward transmission execution.
Data Source
AI summary
A terminal apparatus (20) according to an embodiment of the present disclosure includes a data processing unit (201) and a wireless signal processing unit (202). The data processing unit (201) generates a first frame including a requirement related to a latency during data communication and inquiring a base station (10) whether communication that satisfies the requirement is possible. The wireless signal processing unit (202) transmits the first frame.