Adaptive Feedback Rate Balancing Link Direction Capacity

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Solution Overview

Problem

Wireless communication networks using frequency-domain duplexing (FDD) face inefficiencies due to mismatched traffic capacity demands between uplink and downlink directions, leading to sub-optimal use of available transmission spectrum, as the frequency spectrum is typically partitioned equally despite varying traffic loads.

Innovation Solution

Implementing adaptive feedback mechanisms to dynamically balance traffic capacities by varying the information carrying capacity of one link direction based on communication feedback, allowing for non-uniform use of bandwidth and optimizing frequency allocation in response to changing traffic demands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If frequency spectrum is partitioned equally between uplink and downlink, then frequency allocation is simple and fixed, but traffic capacity utilization is sub-optimal due to mismatched traffic demands

Engineering Contradiction:

Improvefrequency allocation simplicityVSAvoidtraffic capacity utilization

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent implements dynamic frequency allocation where the feedback rate for one direction is adaptively adjusted based on traffic conditions. The feedback rate varies over time to balance the traffic capacities of uplink and downlink, transforming the static frequency partitioning into a dynamic resource allocation scheme that responds to changing traffic demands

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the feedback rate parameter adaptively to control the traffic capacity balance. By modifying the feedback rate (a key system parameter) based on traffic conditions, the system can shift traffic capacity between uplink and downlink directions, enabling optimal utilization of available spectrum resources

Inventive Principle:

Principle #35Parameter changes

2Productivity

If frequency spectrum is divided unequally to match traffic demand, then traffic capacity matching improves, but inefficiency remains due to time-varying traffic loads

Engineering Contradiction:

Improvetraffic capacity matchingVSAvoidresponse to time-varying traffic

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent employs feedback mechanisms where traffic capacity information is exchanged between transceivers. Based on this feedback, the system adaptively adjusts the feedback rate to dynamically balance traffic capacities, enabling continuous adaptation to time-varying traffic loads rather than relying on fixed unequal partitioning

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system transitions from static unequal frequency division to dynamic resource allocation. The feedback rate is continuously adjusted based on real-time traffic conditions, allowing the system to adaptively respond to time-varying traffic demands and maintain optimal capacity balance

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If feedback rate is increased to improve capacity balancing, then traffic capacity control precision improves, but uplink resource consumption increases

Engineering Contradiction:

Improvecapacity balancing precisionVSAvoiduplink resource consumption

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies partial feedback action by dynamically adjusting the feedback rate based on traffic conditions. Instead of always using maximum feedback rate, the system uses only the necessary amount of feedback resources required to achieve capacity balancing, avoiding excessive uplink resource consumption while maintaining sufficient control precision

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system changes the feedback rate parameter adaptively to optimize the trade-off between balancing precision and resource consumption. By adjusting this parameter based on traffic conditions, the system achieves adequate capacity control with minimal necessary feedback resources

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8644236B2Balancing capacity between link directions using variable feedback rates

Publication Date: 2014.02.04 MARVELL ASIA PTE LTD

AI summary

A method for communication includes providing a first transceiver configured to communicate with a second transceiver over a bi-directional link having a first aggregation of frequencies that are assigned to carry first communication traffic in a first link direction from the first transceiver to the second transceiver and a second aggregation of frequencies that are assigned to carry second communication traffic in a second link direction from the second transceiver to the first transceiver. Communication feedback is transmitted from the first transceiver to the second transceiver communication feedback at an adaptive feedback rate. The feedback rate is determined so as to achieve a desired balance between the information carrying capacities of the first and second aggregations. An information carrying capacity of the second aggregation is controlled responsively to the communication feedback.