Peer Discovery Resource Allocation for Interference Management
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Solution Overview
Problem
In wireless wide area networks (WWANs), peer discovery signals transmitted by wireless devices to detect each other can cause interference to WWAN communication in neighboring cells due to unsynchronized resource allocation, leading to reduced range and increased latency of peer discovery.
Innovation Solution
A method where a base station determines the path loss or distance of wireless devices to allocate peer discovery resources, distributing them such that devices with higher path loss or distance use resources with more subcarriers and fewer OFDM symbols, while those with lower path loss or distance use resources with fewer subcarriers and more OFDM symbols, minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If wireless devices transmit peer discovery signals at maximum power to maximize peer discovery range, then peer discovery range is improved, but interference to WWAN communication in neighboring cells increases
Solution Approach 1:
The patent segments the peer discovery resources into multiple groupings, where each grouping corresponds to a specific subset of resources (time periods, subcarriers, or OFDM symbols). Wireless devices are assigned to different groupings based on their distance to the base station, allowing them to transmit on different resource subsets simultaneously. This segmentation enables the system to accommodate both maximum power transmission for range and interference management by distributing transmissions across multiple resource groups.
Solution Approach 2:
The patent applies local quality by differentiating resource allocation based on the local characteristics of each wireless device, specifically their distance to the base station. Devices closer to the base station use different resource groupings than devices farther away. This localized differentiation allows each device to transmit at appropriate power levels and on optimized resources, balancing peer discovery range with interference management for each local scenario.
2Object-generated harmful factors
If transmission power is reduced to reduce interference to WWAN communication, then interference is reduced, but peer discovery range decreases and latency increases
Solution Approach 1:
By segmenting resources into multiple groupings with different time periods, subcarrier sets, or OFDM symbol durations, the system allows devices to transmit on different segments simultaneously. This enables the base station to manage interference by controlling which segments are active in neighboring cells while maintaining overall peer discovery effectiveness through the aggregated performance of all segments.
Solution Approach 2:
The patent introduces dynamic resource allocation where the base station determines path loss or distance for each wireless device and dynamically assigns appropriate resource groupings. This dynamic adaptation allows the system to optimize transmission parameters for each device based on its specific conditions, balancing interference reduction with maintaining adequate peer discovery range and minimizing latency.
3Object-generated harmful factors
If multiple groupings of peer discovery resources are used with different time periods and subcarriers, then interference management is improved, but device complexity increases
Solution Approach 1:
The patent divides the complex resource allocation problem into manageable segments by creating distinct groupings based on time periods, subcarrier sets, or OFDM symbols. Each grouping can be independently managed and assigned to specific devices. This segmentation simplifies the overall complexity by breaking down the resource management task into discrete, handleable units that can be systematically allocated based on device requirements and interference conditions.
Data Source
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AI summary
A method of operating a wireless device is provided in which the wireless device determines to use one grouping of peer discovery resources of a plurality of groupings of peer discovery resources based on one of a path loss or a distance to a base station. The plurality of groupings include a first grouping of resources having a first plurality of identical subsets of resources and a second grouping of resources having a second plurality of identical subsets of resources. Each of the first plurality of identical subsets of resources extends over at least one of a different time period or a different number of subcarriers than each of the second plurality of identical subsets of resources. The wireless device transmits a peer discovery signal on one subset of the identical subsets of said one grouping of peer discovery resources.