Unlicensed Channel Coordination via Licensed Band Feedback
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Solution Overview
Problem
In wireless communication systems, especially in distributed systems like V2X, channel selection in unlicensed frequency bands is not coordinated, leading to inconsistent channel choices among user equipment (UEs), which can result in inefficient communication.
Innovation Solution
A method where UEs monitor unlicensed bands, select a channel based on monitoring, and advertise this selection along with location information on a licensed band, allowing nearby UEs to coordinate and potentially use the same channel for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UEs independently select channels in unlicensed bands without coordination, then each UE can autonomously choose a channel, but channel selection inconsistency occurs among UEs leading to inefficient communication
Solution Approach 1:
The patent implements feedback by having UEs advertise their selected unlicensed channel information on the licensed band. This allows other UEs to receive feedback about which channels are already selected by nearby UEs, enabling coordinated channel selection and avoiding inconsistencies that would otherwise reduce communication efficiency.
Solution Approach 2:
The licensed band acts as an intermediary medium between UEs for exchanging channel selection information. Instead of UEs directly coordinating on the unlicensed band (which would be inefficient), the licensed band serves as a communication channel to share selection decisions, enabling indirect coordination and improving overall system efficiency.
2Adaptability or versatility
If UEs use distributed channel selection in unlicensed bands, then spectrum availability is increased, but interference between UEs increases due to lack of coordination
Solution Approach 1:
By advertising selected channel information on the licensed band, UEs provide feedback to the network about their unlicensed band usage. This enables the network to coordinate channel assignments and reduce interference between UEs while still allowing them to utilize unlicensed spectrum resources for increased availability.
Solution Approach 2:
The licensed band serves as an intermediary control channel that mediates access to unlicensed bands. Through this intermediary, the network can coordinate UE selections and manage interference, while UEs still benefit from the expanded spectrum availability provided by unlicensed band access.
3Productivity
If UEs advertise channel information on licensed band, then channel coordination among UEs is improved, but system complexity increases due to dual band management
Solution Approach 1:
The licensed band serves multiple functions: it is used for both traditional licensed band communication and for advertising unlicensed band channel selection information. This multi-functionality reduces the need for separate dedicated control channels, thereby limiting the increase in system complexity despite the dual band operation.
4Loss of time
If UEs monitor and select unlicensed channels autonomously, then response time is reduced, but channel selection consistency deteriorates
Solution Approach 1:
UEs perform preliminary autonomous monitoring and selection of unlicensed channels, enabling fast response time. Subsequently, they advertise their selections on the licensed band, which allows the network to coordinate and ensure consistency. This two-stage approach preserves the speed benefit of autonomous selection while achieving consistency through subsequent coordination.
Data Source
AI summary
Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for channel selection in systems that utilize both licensed and unlicensed frequency bands. As will be described in greater detail below, user equipments (UEs) that share unlicensed frequency band may select a channel in an unlicensed frequency band and advertise their channel selection over a licensed frequency band, in an effort to coordinate communications other UEs. An example method may include selecting at least a first channel within an unlicensed band for communications with at least a second UE, and transmitting, on a licensed band, an indication of the first channel and location information for the selection.