Radio Base Station RDG Duration Calculation
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Solution Overview
Problem
Conventional IEEE 802.11n bi-directional data transfer methods fail to accurately determine the Reverse Direction Grant (RDG) Duration, leading to inefficient data transmission and hardware design complexities due to the lack of consideration for traffic streams and radio environment conditions.
Innovation Solution
A radio base station apparatus that sets a ratio between the periods for transmitting frames from an initiator and a responder, allowing for the calculation of RDG Duration based on the transmission opportunity period and this ratio, facilitating efficient bi-directional data transfer and simplifying hardware design by separating software and hardware processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conventional bi-directional data transfer method is used where the initiator determines RDG Duration based on responder's required values, then the responder can transmit data during the granted period, but the transmission period to satisfy the initiator's traffic stream requirements is consumed by the responder's data transmission and the initiator's traffic stream requirements cannot be satisfied
Solution Approach 1:
The patent applies preliminary action by having the initiator determine the RDG Duration in advance based on its own traffic stream requirements and the ratio between initiator and responder periods, rather than simply accepting the responder's requested values. This allows the initiator to pre-calculate the appropriate grant duration that ensures both parties' requirements can be met, preventing the situation where the initiator's requirements are violated by the responder's transmission.
2Adaptability or versatility
If the RDG Duration is determined by reflecting all required values from the responder, then the responder's data transmission needs are met, but the initiator's traffic stream requirements cannot be satisfied
Solution Approach 1:
The patent applies parameter changes by introducing a ratio parameter between the initiator period and responder period, and using this ratio to calculate the RDG Duration. Instead of directly using the responder's requested values, the initiator transforms these parameters through calculation based on the predetermined ratio, ensuring that the resulting RDG Duration satisfies both the responder's transmission needs and the initiator's traffic stream requirements.
3Speed
If the conventional method calculates RDG Duration in extremely short time after receiving RAC frame, then the hardware design requires high operation speed, but hardware design becomes complex and modifications are difficult
Solution Approach 1:
The patent applies preliminary action by pre-determining the ratio between the initiator period and responder period before the actual data transmission occurs. This ratio is calculated and stored in advance, so that when the RDG Duration needs to be determined, the system only needs to perform a simple calculation using this pre-established ratio rather than performing complex real-time analysis, thereby reducing hardware complexity while maintaining high calculation speed.
4Device complexity
If the initiator determines RDG Duration without considering traffic stream settings and radio environment, then the calculation is simpler, but the transmission efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by transforming the complex multi-factor determination process into a simplified calculation based on a predetermined ratio parameter. The initiator determines the RDG Duration by calculating based on this ratio and its own traffic stream requirements, rather than performing complex real-time analysis of multiple parameters. This maintains transmission efficiency while significantly reducing calculation complexity.
Data Source
AI summary
A radio base station apparatus used in a radio communication system in which an initiator holds a transmission opportunity (TXOP) period in a frame exchange sequence and a responder responds to the initiator in the frame exchange sequence is disclosed. The apparatus includes a setting device which sets a ratio between a first period necessary for transmitting a first frame from the initiator to the responder and a second period necessary for transmitting a second frame from the responder to the initiator. The apparatus also includes a calculation device which calculates the first period to be used by the initiator and the second period to be used by the responder, on the basis of the transmission opportunity period and of the ratio which is set.