Wireless Random Access Timer and ACK Spacing
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Solution Overview
Problem
Current wireless communication systems lack the ability to set a proper resource allocation standby time based on Quality of Service (QoS) and fail to minimize the overhead of ACK/NACK messages in broadband wireless access systems, leading to inefficient resource allocation and increased latency.
Innovation Solution
A method for random access in wireless communication systems that involves transmitting a bandwidth request with a timer value determined by the base station's acknowledgement, allowing for differentiated resource allocation standby times based on QoS and mobile station priority, and minimizing ACK/NACK overhead by spacing ACK transmissions apart from resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed resource allocation standby time is used for all mobile stations, then the system operation is simplified, but QoS differentiation and resource allocation efficiency deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation standby time by allowing the base station to set different timer values (T1, T2, T3) based on mobile station priority and QoS requirements. High-priority stations receive shorter timer values for faster resource allocation, while low-priority stations receive longer timer values, enabling the system to adapt to different service requirements without complex manual configuration.
Solution Approach 2:
The patent changes the parameter of resource allocation standby time from a fixed value to a variable value that can be adjusted according to mobile station priority and QoS levels. The base station dynamically modifies the timer value parameter in response to bandwidth request indicators, allowing the system to optimize resource allocation for different service types (e.g., real-time vs. non-real-time traffic) without increasing operational complexity.
2Reliability
If ACK/NACK messages are transmitted frequently to confirm bandwidth requests, then transmission reliability is improved, but message overhead and system latency increase
Solution Approach 1:
The patent applies partial acknowledgment by having the base station selectively send ACK/NACK messages based on whether resource allocation is necessary. When resources are available and allocation is straightforward, the base station may omit ACK messages, reducing overhead. When resource contention exists or allocation requires coordination, ACK messages are sent to ensure reliable transmission, thus applying acknowledgment only when partially needed rather than universally.
3Reliability
If resource allocation standby time is extended to ensure proper resource allocation, then resource allocation reliability is improved, but system latency and efficiency deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of resource allocation standby time based on mobile station priority and QoS requirements. High-priority stations with urgent traffic needs receive shorter timer values (T1) that enable faster resource allocation, improving system efficiency for critical services. Low-priority stations receive longer timer values (T3) that ensure thorough resource allocation checks, maintaining reliability for non-critical services. This dynamic approach optimizes the balance between reliability and efficiency for different traffic types.
Data Source
AI summary
A random access method in a wireless communication system is disclosed. The present invention includes transmitting a bandwidth request indicator and a quick access message from a mobile station to a base station and starting a timer having a timer value determined according to an acknowledgement from the base station.