Adaptive Interframe Space Selection for TDD Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In time division duplexing systems, especially those using frequency hopping, the interframe space (IFS) is often too large, leading to inefficiencies due to overhead, particularly when handling short packets and requiring frequency changes, which affects communication efficiency and stability.
Innovation Solution
The method involves selecting an IFS duration based on whether the frequency changes between packets, using a shorter IFS when the same frequency is maintained and a longer IFS when frequency hopping occurs, allowing for adaptive adjustment to optimize packet exchange time and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed large IFS duration is used to accommodate frequency hopping, then frequency stability is ensured, but communication efficiency deteriorates due to excessive overhead
Solution Approach 1:
The patent applies dynamics by making the IFS duration variable rather than fixed. The system dynamically adjusts the IFS duration based on whether frequency hopping occurs: using a shorter IFS when frequency remains stable and a longer IFS when frequency hopping is required. This resolves the contradiction by adapting the IFS duration to actual communication conditions, ensuring frequency stability when needed while maximizing communication efficiency when frequency hopping is not required.
Solution Approach 2:
The patent changes the parameter of IFS duration based on communication conditions. By monitoring whether frequency hopping occurs between packets, the system selects appropriate IFS durations from a set of possible values. This parameter adaptation allows the system to maintain frequency stability when hopping occurs while reducing overhead and improving efficiency when frequency remains constant.
2Reliability
If a larger IFS is used to ensure frequency synthesizer settling time, then frequency hopping stability is improved, but packet exchange time increases
Solution Approach 1:
The system dynamically adjusts IFS duration based on whether frequency hopping occurs. When frequency hopping is detected, a longer IFS is applied to allow the frequency synthesizer sufficient settling time, ensuring stability. When no frequency hopping occurs, a shorter IFS is used, minimizing the time loss in packet exchange. This dynamic adaptation resolves the contradiction between stability and time efficiency.
Solution Approach 2:
The patent changes the IFS parameter adaptively based on frequency hopping conditions. By selecting from multiple possible IFS durations according to actual communication needs, the system ensures adequate synthesizer settling time when frequency hopping occurs while reducing unnecessary time overhead when frequency remains stable, thereby optimizing packet exchange time.
3Productivity
If a shorter IFS is used to reduce overhead, then communication efficiency improves, but frequency synthesizer settling time may be insufficient
Solution Approach 1:
The system applies dynamics by adjusting IFS duration based on frequency hopping detection. When frequency hopping occurs, the system automatically selects a longer IFS to ensure the frequency synthesizer has adequate settling time, maintaining reliability. When no frequency hopping occurs, a shorter IFS is used to minimize overhead and maximize communication efficiency. This dynamic adjustment resolves the contradiction between efficiency and settling time requirements.
Solution Approach 2:
The patent changes the IFS parameter adaptively based on whether frequency hopping occurs. By selecting appropriate IFS durations from a set of possible values, the system ensures sufficient frequency synthesizer settling time when hopping occurs while using shorter IFS values to reduce overhead and improve efficiency when frequency remains constant.
Data Source
AI summary
Embodiments described herein relate to methods and apparatuses for optimizing interframe space in time division duplexing communication between a first wireless device and a second wireless device. A method in the first wireless device comprises receiving a first packet from the second wireless device; selecting an interframe space, IFS, duration from a plurality of possible IFS durations; and transmitting a second packet to the second wireless device when the selected IFS duration has elapsed after receipt of the first packet.