Uplink Packet Error Rate Management in Wireless Networks
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Solution Overview
Problem
IEEE 802.16 wireless networks face challenges in efficiently managing packet error rates (PER) for different applications due to centralized scheduling, which can lead to inappropriate modulation coding schemes being used for uplink transmissions, affecting voice and data applications.
Innovation Solution
Incorporating a Packet Error Rate (PER) target in the uplink MAP information elements (IEs) allows remote stations to schedule transmissions based on the advertised PER, enabling more efficient data transfer by distinguishing between different types of traffic, such as voice and data, and dynamically adjusting parameters like modulation schemes and coding sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If centralized scheduling is used in the base station, then resource allocation is simplified, but the remote station cannot efficiently adapt to varying channel conditions and meet different PER targets for different applications
Solution Approach 1:
The patent segments the scheduling function by separating grant allocation (performed by the base station in centralized UL grants) from PER target selection (performed by the remote station). This allows the base station to maintain simple centralized scheduling while enabling the remote station to adapt to different channel conditions and application requirements by selecting appropriate PER targets from multiple advertised options.
Solution Approach 2:
The patent introduces dynamic adaptability by having the base station advertise multiple PER targets that can be dynamically selected by the remote station based on current channel conditions and application requirements. This dynamic selection mechanism allows the system to adapt to varying conditions without increasing base station scheduling complexity.
2Device complexity
If a single PER target is used for all uplink transmissions, then configuration is simplified, but different applications cannot meet their specific PER requirements
Solution Approach 1:
The patent applies local quality by allowing different PER targets to be selected for different applications or traffic types at the remote station. Each application can utilize the PER target that best suits its requirements (e.g., lower PER for voice, higher PER for data), while the base station maintains a unified configuration of multiple PER targets to advertise.
Solution Approach 2:
The system transitions from a static single PER target configuration to a dynamic multi-PER target system where the remote station can selectively apply different PER targets based on current transmission needs, channel conditions, and application requirements, enabling fine-grained control without complex base station intervention.
3Extent of automation
If the base station processes all uplink signals, then centralized control is maintained, but the remote station cannot efficiently adapt to time-varying channel conditions
Solution Approach 1:
The patent segments the adaptation function from the centralized control function. The base station maintains centralized control by allocating UL grants and advertising multiple PER targets, while the remote station autonomously selects the appropriate PER target based on its local observation of channel conditions, achieving both centralized control and local adaptability.
Solution Approach 2:
The remote station performs self-service by autonomously selecting the appropriate PER target from the advertised options based on its local channel conditions and application requirements, without requiring continuous base station intervention or processing, thus maintaining centralized control while enabling efficient local adaptation.
Data Source
AI summary
Methods and apparatuses for dynamic error rate management. A wireless station may receive one or more data transfer parameters from another wireless station using a wireless communications protocol. Data may be selected to be transferred between the stations according to the wireless communications protocol based, at least in part, on the one or more data transfer parameters. The one or more data parameters may include a target packet error rate (PER).