Wireless Terminal Beam Failure Reporting via Bitmap Aggregation
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Solution Overview
Problem
In wireless communication systems, existing methods fail to efficiently report beam failure across multiple cells, leading to unnecessary resource allocation and increased signaling overhead.
Innovation Solution
A method where a terminal detects beam failure in multiple cells and reports state information, including bitmap and new beam information, to a base station using a single uplink channel, allowing the base station to quickly recognize beam failure and minimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods are used to report beam failure across multiple cells, then beam failure can be reported, but resource allocation is unnecessary and signaling overhead is increased
Solution Approach 1:
The patent combines beam failure reporting for multiple cells into a single uplink message. Instead of separately reporting beam failure for each cell, the terminal aggregates the status of N cells (where N ≥ 2) and transmits unified state information containing bitmap data indicating which cells experienced beam failure and identification information of new beams for those cells. This merging approach eliminates redundant signaling and reduces overall overhead while maintaining comprehensive beam failure monitoring across all configured cells.
Solution Approach 2:
The state information message serves multiple functions simultaneously: it reports beam failure status for multiple cells, provides identification of new candidate beams, and enables the base station to make coordinated resource allocation decisions across all affected cells. This multi-functional approach replaces what would otherwise require multiple separate signaling interactions, thereby reducing signaling overhead while improving reporting efficiency.
2Reliability
If existing methods are used to report beam failure across multiple cells, then beam failure can be reported, but resource allocation is unnecessary and increased
Solution Approach 1:
The terminal performs preliminary identification of new candidate beams for each cell before transmitting the state information message. By pre-processing and organizing the beam status information, including bitmap representation of failed cells and new beam identification, the terminal enables the base station to quickly recognize beam failure conditions and allocate resources only where necessary, avoiding unnecessary resource allocation across all cells.
3Reliability
If beam failure is reported for multiple cells, then comprehensive coverage is achieved, but signaling overhead is increased
Solution Approach 1:
The patent transforms the representation of beam failure status by changing parameters from individual cell reports to a compact bitmap format. Each bit in the bitmap corresponds to a specific cell, indicating whether beam failure occurred. This parameter transformation maintains complete coverage of all N cells while dramatically reducing the signaling structure complexity compared to individual reporting for each cell.
Data Source
AI summary
Disclosed are: a method by which a terminal reports state information, relating to one or more cells from among a plurality of cells set in the terminal, in a wireless communication system including the terminal and a base station having the plurality of cells; and a terminal and a base station for supporting same. According to one embodiment applicable to the present disclosure, a terminal can efficiently report, to a base station, state information related to one or more cells in which beam failure has occurred and, in response thereto, the base station can recognize the beam failure in the one or more cells.