Uplink Rate Request Retransmission for Wireless Scheduling
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Solution Overview
Problem
Current wireless communication networks face inefficiencies in scheduling data transmissions due to bandwidth constraints and round trip delays, leading to wasted signalling bandwidth and potential loss of rate request messages, especially when high data rates are required.
Innovation Solution
The method involves establishing a data channel and a signalling channel for user equipment to repeatedly send rate request messages until a rate grant message is received, utilizing otherwise wasted uplink signalling bandwidth and reducing the risk of message loss, allowing for faster scheduling of higher data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the packet scheduler is located in the radio network controller, then centralized control of data transmissions is achieved, but bandwidth constraints on the signalling interface limit the ability to adapt to instantaneous traffic changes
Solution Approach 1:
The patent segments the scheduling functionality by introducing a distributed scheduler at the node B level while maintaining the centralized radio network controller. This allows local scheduling decisions to be made at the node B (improving response time), while the radio network controller retains overall resource management authority (maintaining centralized control). The segmentation resolves the contradiction by enabling both centralized coordination and rapid local adaptation.
2Reliability
If the packet scheduler is conservative in allocating uplink power, then the influence from inactive users is accounted for, but spectral efficiency deteriorates for high allocated data rates
Solution Approach 1:
The patent implements dynamic scheduling at the node B that can rapidly adjust uplink power allocation based on current traffic conditions and user activity. Unlike the conservative static approach, the dynamic scheduler at node B can immediately respond to active users and allocate resources efficiently, achieving both reliability through proper resource management and high spectral efficiency through adaptive power allocation.
3Reliability
If rate request messages are sent repeatedly during the waiting period, then the reliability of message delivery is improved, but signalling bandwidth consumption increases
Solution Approach 1:
The patent enables the user equipment to autonomously retransmit rate request messages without requiring additional network coordination or acknowledgment mechanisms. The UE self-manages the retransmission process by monitoring for the rate grant message and automatically sending follow-up rate requests if no grant is received, improving reliability while minimizing additional signalling overhead compared to protocol-driven retransmission schemes.
Data Source
AI summary
A method of scheduling transmission of data in a wireless communication network comprising: establishing a data channel for transmitting user data from a user equipment to a network entity, establishing a signaling channel for transmitting signaling data from a user equipment to a network entity, transmitting over said signaling channel from the user equipment a first rate request message requesting additional resources from the network for transmission of data at an increased data rate over said data channel, maintaining said signaling channel for a period awaiting a rate grant message, and transmitting a second rate request message over said signaling channel during said period.