Wireless Resource Reuse for Base Station Interference

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Solution Overview

Problem

In heterogeneous wireless communication networks, unplanned or semi-planned deployments of base stations lead to increased interference due to varying transmit powers and types, complicating access and acquisition techniques, especially with the introduction of restricted access base stations, which can desensitize terminals and reduce network efficiency.

Innovation Solution

Implementing a resource re-use scheme that allocates specific orthogonal wireless resources to different categories of base stations based on type, power, and service area, and dynamically adjusts these allocations based on network load and interference conditions using a processor-driven method to mitigate interference and optimize access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If restricted access base stations are deployed to provide exclusive access to specific terminals, then access control and privacy are improved, but interference to other terminals increases and network efficiency decreases

Engineering Contradiction:

Improveaccess control reliabilityVSAvoidinterference to other terminals

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the wireless communication spectrum into different resource sets (first resources and second resources) allocated to different base station types. Restricted access base stations use first resources while general access base stations use second resources, preventing interference between different access types and maintaining network efficiency while preserving access control reliability.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If base stations transmit at high power to cover large areas, then coverage area is improved, but interference to other base stations increases

Engineering Contradiction:

Improvecoverage areaVSAvoidinterference to other base stations

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent divides wireless resources into time-subframes and frequency-subbands, assigning different subsets to different base station categories. High-power macro base stations can transmit during certain resource subsets while low-power micro/femto base stations use other subsets, allowing both coverage area and interference reduction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic resource allocation where base stations can switch between different resource subsets based on deployment type and interference conditions. This dynamic adjustment allows high-power base stations to maintain coverage while avoiding interference with low-power base stations through coordinated resource usage.

Inventive Principle:

Principle #15Dynamics

3Object-generated harmful factors

If resource allocation is fixed for different base station types, then interference is reduced, but adaptability to changing network conditions decreases

Engineering Contradiction:

Improveinterference reductionVSAvoidadaptability to network conditions

Core Design Contradiction:

Object-generated harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent establishes a dynamic resource allocation mechanism where the network controller can reassign resource subsets to different base stations based on real-time network conditions, load, and interference levels. This maintains the structured resource division that reduces interference while providing flexibility to adapt to changing deployment scenarios.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent allows dynamic modification of resource allocation parameters such as time-subframe assignments and frequency-subband distributions. The system can adjust these parameters based on network load, interference conditions, and deployment changes, maintaining both interference reduction and adaptability.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If multiple base stations operate simultaneously in the same area, then network capacity is improved, but access complexity and interference management difficulty increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidaccess complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments access procedures into distinct phases and resource sets for different base station types. This segmentation simplifies the access protocol by providing clear, dedicated resource assignments, reducing the complexity of managing multiple simultaneous base stations while maintaining high network capacity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8737229B2Access mechanisms for base stations in heterogeneous access point networks

Publication Date: 2014.05.27 QUALCOMM INC

AI summary

Providing for improved access communication for wireless systems is described herein. By way of example, wireless devices can employ wireless resource re-use in selecting a subset of access communication resources, to mitigate interference on uplink access requests. Re-use can be based on current network conditions, or on a type of base station facilitating the wireless communication. In some aspects, planned resource re-use can be facilitated by an access terminal. The access terminal requests neighboring or interfering network access points to reserve a set of resources for a serving access point. Reserved resources can be conveyed to the serving access point with an uplink access probe, to further mitigate interference.