Mobile Rate Control Offset Adjustment for Channel Adaptation
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Solution Overview
Problem
Existing rate control methods in mobile communication systems, such as Closed Loop Rate Control (CLRC) and Open Loop Rate Control (OLRC), face challenges in adapting quickly to abrupt changes in channel state and maximizing transmission efficiency, especially when the channel state reverses.
Innovation Solution
A method and apparatus that adjust the offset value based on the success or failure of previous packet transmission, maintaining the offset when channel quality is at extreme levels, and updating it only when necessary to ensure quick adaptation to changing channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the offset value is continuously updated to adapt to channel changes, then the transmission efficiency is improved, but the system cannot adapt quickly when channel state reverses
Solution Approach 1:
The offset value is dynamically adjusted based on packet reception status. When packets are successfully received, the offset is updated to optimize transmission efficiency. When packets fail to be received, the offset is maintained at its current value to preserve adaptation speed. This dynamic adjustment mechanism resolves the contradiction between transmission efficiency and adaptation speed.
Solution Approach 2:
The system uses feedback from packet reception status to determine whether to update the offset value. Successful packet reception triggers offset updates to improve efficiency, while failed reception maintains the offset to preserve quick adaptation capability. This feedback mechanism enables the system to balance transmission efficiency and adaptation speed based on actual channel conditions.
2Speed
If the offset value is maintained at extreme levels, then the adaptation speed is improved, but the transmission efficiency decreases
Solution Approach 1:
The offset value transitions from static extreme maintenance to dynamic adjustment based on packet reception status. When packets are successfully received, the offset is updated to optimize transmission efficiency. When packets fail, the offset remains at extreme levels to maintain adaptation speed. This dynamic behavior resolves the contradiction between adaptation speed and transmission efficiency.
Solution Approach 2:
The system changes the offset parameter based on packet reception status. Successful reception triggers parameter updates to improve efficiency, while failed reception maintains extreme parameter values to preserve adaptation speed. This parameter change mechanism enables the system to optimize both adaptation speed and transmission efficiency under different channel conditions.
3Productivity
If the offset range is limited to narrow values, then the transmission efficiency is maximized, but the adaptation speed to channel changes decreases
Solution Approach 1:
The offset range is dynamically adjusted based on packet reception status. When packets are successfully received, the offset can be updated within an appropriate range to maximize transmission efficiency. When packets fail to be received, the offset is maintained at extreme values to ensure quick adaptation to channel changes. This dynamic range adjustment resolves the contradiction between transmission efficiency and adaptation speed.
Solution Approach 2:
The system uses packet reception feedback to determine the appropriate offset range. Successful reception allows the system to operate within efficiency-optimized ranges, while failed reception triggers the system to maintain extreme offset values for rapid adaptation. This feedback mechanism enables the system to balance transmission efficiency and adaptation speed based on actual channel conditions.
Data Source
AI summary
A method and apparatus are provided for controlling a data rate in a mobile communication system. The method includes changing an offset from a first offset used in a previous packet to a second offset determined based on whether or not the previous packet is successfully received by a second apparatus; determining whether or not a second channel quality in which the second offset is applied is within a range from a minimum quality to a maximum quality; if it is determined that the second channel quality is not within the range, determining that the offset is maintained as the first offset in a current packet; and transmitting, to the second apparatus, the current packet according to a first channel quality in which the first offset is applied.