Happy Bit Feedback for Enhanced Uplink Carrier Allocation
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Solution Overview
Problem
Current wireless communication systems, particularly in UMTS networks, face challenges in efficiently determining whether user equipment (UE) can benefit from transmitting at a higher data rate across multiple uplink carriers, due to limitations in channel conditions and buffer lengths feedback mechanisms.
Innovation Solution
The system independently determines a Happy Bit for each uplink carrier based on channel conditions and buffer lengths, allowing the UE to indicate if it has available power to increase data transmission rates, thereby informing the Node B about resource allocation needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common happy bit across multiple carriers is used, then feedback complexity is reduced, but the ability to provide carrier-specific resource allocation feedback is lost
Solution Approach 1:
The patent divides the single happy bit into multiple carrier-specific happy bits, with each carrier having its own independent happy bit indicator. This segmentation allows the system to maintain simple feedback structure (one bit per carrier) while achieving precise carrier-specific resource allocation feedback, resolving the contradiction between feedback simplicity and measurement precision.
2Measurement precision
If individual happy bits are used for each carrier, then carrier-specific feedback precision is improved, but feedback overhead and complexity increase
Solution Approach 1:
The patent implements local quality by assigning independent happy bits to each carrier, allowing each carrier to have its own feedback state. This enables precise carrier-specific resource allocation feedback while keeping each individual feedback unit simple (one bit per carrier), thus resolving the contradiction between precision and overall complexity.
3Loss of time
If happy bit feedback is delayed, then processing time is reduced, but the timeliness of resource allocation feedback deteriorates
Solution Approach 1:
The patent incorporates happy bit feedback into the existing E-DPCCH uplink control channel structure, which is already configured for timely transmission. By leveraging the pre-configured channel structure and integrating happy bit determination into the regular MAC protocol operations, the system achieves timely feedback without requiring additional processing time, thus resolving the contradiction between processing time and feedback timeliness.
Data Source
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AI summary
Various processing options and systems are provided for setting/controlling feedback indicators referred to as "Happy Bits" in a wireless communication network using multiple uplink carriers. In one aspect, a Happy Bit is determined independently for each one of a plurality of uplink carriers based on channel conditions and buffer lengths for the respective carrier. For example, if a UE is transmitting the maximum data allowed by its serving grant for that carrier, the UE has available power to increase the data rate on that carrier, and the TEBS delay is greater than a certain threshold, then the Happy Bit for that carrier may be set to Unhappy to inform the Node B that the UE is capable of transmitting at a higher data rate on that carrier.