Physical Layer Signaling Across Shared Spectrum Resources
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Solution Overview
Problem
Existing wireless communication systems, such as LTE and LTE-A, lack mechanisms to inform user equipment (UE) of varying physical layer parameters on a subframe-by-subframe basis in shared radio frequency spectrum bands, leading to inefficiencies in coexistence with other users and potential power consumption issues.
Innovation Solution
The system configures UEs into groups based on capability and data type, using physical layer channels like PHICH, PCFICH, and PDCCH to transmit varying physical layer parameters, enabling dynamic adjustment of frame formats and power settings on a subframe basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If physical layer parameters are signaled using existing LTE/LTE-A mechanisms, then system compatibility is maintained, but dynamic adjustment capability on a subframe-by-subframe basis is lost
Solution Approach 1:
The patent segments the parameter signaling by dividing UEs into different groups (first UE group and second UE group) and assigning different subsets of physical resources to each group. This segmentation enables targeted delivery of parameter variation information to specific UE groups, resolving the contradiction by allowing dynamic adjustment for those who need it while maintaining compatibility for others.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by using different subsets of physical resources (time-frequency resources) for different UE groups. This dimensional approach allows the system to convey parameter variation information dynamically without breaking existing LTE/LTE-A compatibility, as the new signaling occurs in an additional resource dimension rather than replacing existing mechanisms.
2Loss of information
If all UEs monitor all physical resources for parameter signaling, then complete information is received, but power consumption increases
Solution Approach 1:
The patent applies local quality by configuring different UE groups to monitor different subsets of physical resources based on their specific needs and capabilities. Each UE only monitors the relevant subset assigned to its group, receiving complete parameter information for its context while consuming less power by not monitoring all resources system-wide.
3Use of energy by moving object
If different UE groups monitor different resource subsets, then power consumption is reduced, but information delivery complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring UE groups and their assigned resource subsets before actual parameter signaling begins. This upfront configuration simplifies the ongoing signaling process, as UEs already know which resources to monitor, reducing the need for complex dynamic allocation decisions during operation.
Data Source
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AI summary
Techniques are provided that enable signaling of physical layer parameters in a shared radio frequency spectrum band or a dedicated radio frequency spectrum band (or any available radio frequency spectrum band). One or more physical layer channels may be used to transmit physical layer parameters, and different portions of the channel(s) may carry physical layer information for different groups of UEs. Abase station may configure a UE into a UE group that monitors particular channel resources based on the UE group. In this manner, a base station may transmit physical layer parameters that may be received by a UE for receiving wireless communications for one or more subframe. A base station may transmit physical layer parameters to be monitored by the use using a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH), a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), or combinations thereof.