Interference Source Identification via Terminal Reception Timing
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Solution Overview
Problem
In broadband wireless access systems, interference source information cannot be accurately collected when terminals fail to receive broadcast messages from newly started Neighbor Base Stations due to interference or other issues, leading to incomplete data and incorrect interference reporting.
Innovation Solution
A method where terminals report receiving time information for broadcast messages, allowing the Operating Base Station to determine interference sources for terminals that did not correctly receive the message by associating receiving time information, and update the coexistence database with interference source information, even if some terminals cannot demodulate or correctly receive the broadcast message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminals receive broadcast messages from newly started Neighbor Base Stations, then interference source information can be collected, but terminals may fail to receive the broadcast message due to interference or other issues, leading to incomplete data
Solution Approach 1:
The patent implements a feedback mechanism where terminals report their reception status of broadcast messages to the Operating Base Station. The OBS uses this feedback information to identify which terminals failed to receive the broadcast message and manually determines interference source information for these terminals based on their reported receiving time information, thereby resolving the contradiction between message reception reliability and interference source identification accuracy.
Solution Approach 2:
The patent introduces receiving time information as an intermediary element. Instead of directly relying on terminals to report interference sources, the system uses receiving time information as a mediator to indirectly determine interference sources. The OBS matches receiving time information from terminals that failed to receive the broadcast message with the broadcast message timing, thereby inferring the interference source without requiring direct terminal reporting of interference conditions.
2Productivity
If terminals report interference information, then the Operating Base Station can update the coexistence database, but terminals that cannot demodulate or correctly receive the broadcast message cannot provide accurate interference reporting
Solution Approach 1:
The patent applies partial action by requiring terminals to report only the receiving time information of the broadcast message rather than requiring complete and accurate interference condition reporting. This partial reporting approach allows terminals that failed to correctly receive the broadcast message to still contribute useful timing information, enabling the OBS to manually determine interference sources without discarding these terminals' reports, thereby improving information collection efficiency while reducing information loss.
3Object-affected harmful factors
If the system requires rigid frame timing alignment for BS coexistence, then interference between neighboring BSs is reduced, but the complexity of coordinating and managing timing among multiple BSs increases
Solution Approach 1:
The patent implements self-service by having each terminal independently record and report its own receiving time information of the broadcast message. The Operating Base Station then uses this self-reported timing data to manually determine interference sources without requiring complex centralized timing coordination or control signals from the system controller. This approach reduces timing coordination complexity while maintaining effective interference management.
Data Source
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AI summary
A wideband wireless access technique, in particular, a method for collecting and reporting interference source information by terminals in coexistence system, in order to solve the problem in prior art that terminals can't collect and report interference source information when there are errors in receiving broadcast message from neighbor BSs. The method includes: each terminal receives broadcast message containing NBS identification information sent by NBS when initializing, terminals which can demodulate and check accurately contain the broadcast message and receiving time information in interfered reporting message and send the interfered reporting message to the operating base station OBS, and terminals which can't demodulate and check in error contain receiving time information in reporting message; OBS records the receiving time information reported by each terminal, and records the NBS identification information contained in the broadcast message reported by terminals which check accurately as the interference source of the terminals which report the broadcast message; then, searches and records the interference sources for the other terminals from the recorded interference sources according to the relationship between the receiving time information.