Differentiated Back-Off Timer for Wireless Bandwidth Requests
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Solution Overview
Problem
Current bandwidth request multiplexing techniques in wireless cellular communication systems suffer from low channel utilization due to dedicated request channels and collisions on common random access channels, leading to inefficient resource allocation and unequal service delays for different Quality of Service (QoS) requirements.
Innovation Solution
A method where a mobile station selects a random time delay for bandwidth requests based on Quality of Service (QoS) and load parameters received from the base station, using a back-off interval defined by connection priority, initial back-off interval, maximum back-off interval, and back-off interval scaling factor to optimize contention resolution on a common random access channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated uplink request channel is assigned to each mobile station, then bandwidth requests can be sent simultaneously without collision, but channel utilization becomes low and communication resources are wasted
Solution Approach 1:
The invention segments mobile stations into different priority groups (first priority and second priority) and assigns them to different logical request channels (first request channel and second request channel). This segmentation allows simultaneous transmissions from different priority groups without collision while maintaining better overall channel utilization compared to dedicated channels for each station.
Solution Approach 2:
The invention makes a common random access channel serve multiple functions by implementing priority-based logical channels on top of it. The same physical channel is universally used by all mobile stations, but with differentiated access mechanisms based on priority, thus improving utilization while maintaining reliability for high-priority traffic.
2Loss of energy
If a common random access channel is used for bandwidth request multiplexing, then resource utilization is improved, but collisions occur when multiple mobile stations request bandwidth simultaneously
Solution Approach 1:
The invention segments the common random access channel into multiple logical request channels based on mobile station priority. First priority mobile stations use a first logical request channel while second priority mobile stations use a second logical request channel. This segmentation reduces collisions by separating traffic streams while still utilizing the common physical channel efficiently.
Solution Approach 2:
The invention applies different access characteristics to different parts of the channel access mechanism based on priority. High-priority stations experience different backoff behavior and channel access probabilities compared to low-priority stations, ensuring that critical traffic gets preferential treatment while maintaining overall channel utilization.
3Device complexity
If equal back-off timing is used for all mobile stations, then simplicity is maintained, but delay equity is compromised as users with more failed attempts experience increasing delays
Solution Approach 1:
The invention applies different back-off interval characteristics to mobile stations based on their priority level. First priority mobile stations use one back-off interval configuration while second priority mobile stations use another configuration. This ensures that high-priority traffic experiences smaller delays on average, improving delay equity without requiring complex per-station adaptive mechanisms.
Solution Approach 2:
The invention changes the back-off interval parameters (minimum back-off interval, maximum back-off interval) based on mobile station priority. By adjusting these parameters differently for different priority groups, the system achieves better delay equity while maintaining relatively simple implementation through parameter configuration rather than complex algorithms.
4Device complexity
If QoS-insensitive bandwidth request handling is used, then implementation simplicity is maintained, but service differentiation for different QoS requirements cannot be achieved
Solution Approach 1:
The invention applies different channel access characteristics to different mobile stations based on their QoS requirements and priority levels. High-priority stations with delay-sensitive traffic get preferential treatment through separate logical channels and different back-off parameters, while low-priority stations use standard access mechanisms. This provides QoS service differentiation while keeping the overall mechanism relatively simple through priority-based classification.
Data Source
AI summary
Differentiating wireless uplink bandwidth request by connection priority. Embodiments herein relate to wireless communications, and more particularly to bandwidth management in wireless communications. Embodiments herein focus on multiplexing bandwidth requests on a common random access channel; specifically on contention resolution protocols for a common random access channel. Embodiments herein propose a differentiated back-off timer scheme to address the problems of QoS insensitivity and delay inequity, a set of back-off parameters to implement this scheme and a method of implementing existing well-known back-off strategies within this scheme's framework.