Multi-Channel Communication in Unlicensed Spectrum
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Solution Overview
Problem
In unlicensed spectrum communication, devices face increased latency due to the need to scan multiple channels before transmission, especially when channels are close in frequency, leading to inefficiencies and reduced reliability in signal transmission.
Innovation Solution
An apparatus that initiates scanning of multiple channels, determines availability, estimates future transmission opportunities, and manages latency by deferring transmission based on a set deferral allowance, allowing simultaneous transmission on multiple channels while minimizing latency impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device scans multiple channels separately before transmission, then the reliability of transmission is improved, but the latency increases significantly
Solution Approach 1:
The device performs channel scanning and availability determination before transmission opportunity arises. By pre-scanning multiple channels and determining their availability status in advance, the system can make informed decisions about transmission timing without waiting until the last moment, thus reducing latency while maintaining reliability through thorough channel assessment
Solution Approach 2:
The system dynamically adjusts transmission decisions based on real-time channel availability status. When a channel is sensed as available, the device can immediately transmit if deferral allowance is exhausted or when no further channels are expected to become available. This dynamic adaptation allows the system to balance between waiting for optimal transmission conditions and acting promptly to reduce latency
2Productivity
If a device waits for multiple channels to be available before transmission, then the efficiency of spectrum utilization is improved, but the latency increases
Solution Approach 1:
The device transmits on channels that are confirmed available rather than waiting for all scanned channels to be available. This partial action approach allows the system to utilize spectrum resources immediately on suitable channels while still scanning other channels in parallel, thereby improving spectrum utilization efficiency without the latency penalty of waiting for perfect channel conditions across all frequencies
Solution Approach 2:
Channel scanning and availability assessment is performed in advance before transmission opportunity. By determining which channels are available beforehand, the system can efficiently allocate and transmit on the most suitable channels without unnecessary delays, optimizing both spectrum utilization and transmission timing
3Measurement precision
If scanning is performed on channels close in frequency band, then channel availability is determined accurately, but the scanning process cannot occur during transmission
Solution Approach 1:
The frequency spectrum is divided into multiple discrete channels that can be scanned independently. By segmenting the spectrum into separate channel units, the device can scan each channel's availability status independently and in parallel where possible, maintaining detection accuracy while simplifying the overall scanning process through structured channel-by-channel assessment
Solution Approach 2:
Channel availability scanning is performed as a preliminary step before transmission opportunity arises. By completing the scanning and availability determination in advance, the system eliminates the conflict between scanning during transmission and maintaining detection accuracy. The preliminary scanning phase gathers all necessary channel information before the transmission phase begins, resolving the complexity conflict
Data Source
AI summary
A method and apparatus for communicating on multiple channels, perhaps in data duplication communications in unlicensed spectrum. The method comprises scanning a plurality of channels in unlicensed spectrum to determine whether the plurality of channels are available. In response to determining at least one of the channels is available determining when a transmitting opportunity may occur and estimating at least one delay between said transmitting opportunity and at least one further transmitting opportunity at which it is estimated that the apparatus may be able to transmit a signal on at least one other of said multiple channels. Determining hether any of said at least one delays lie within a current deferral allowance and where not transmitting the signal on the available hannel; and where so delaying transmitting the signal until a further transmitting opportunity within the current deferral allowance.