Beam Recovery Early Indicator for Wireless Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication networks supporting high frequency bands, beam failure detection and recovery are inefficient, particularly in non-terrestrial networks, leading to failed paging procedures and increased latency due to the lack of beam-sweeping operations in physical downlink control channel transmissions.
Innovation Solution
A method involving a base station that detects beam failures and initiates a beam recovery early indicator (BREI) transmission based on a beam-sweeping scheme, allowing for quick identification of a preferred beam and enabling proactive beam recovery and paging procedures, using cyclic redundancy check (CRC) scrambled downlink control information and BREI-radio network temporary identifier (BREI-RNTI) for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-sweeping scheme is applied to PDCCH transmission for beam recovery, then beam recovery reliability is improved, but transmission time and system complexity increase
Solution Approach 1:
The base station performs preliminary beam sweeping to identify a preferred beam before beam failure occurs. By proactively determining the preferred beam in advance through uplink signal reception and downlink beam correspondence, the system prepares recovery resources ahead of time, enabling faster beam recovery when failure occurs without requiring time-consuming beam sweeping at that moment.
Solution Approach 2:
The beam recovery process is segmented into distinct phases: preferred beam determination phase (using uplink signals like SRS, PUSCH, PUCCH) and beam failure recovery phase (using the predetermined preferred beam). This segmentation allows the system to use different mechanisms for different stages, avoiding the need for complete beam sweeping during recovery while maintaining reliability.
2Reliability
If beam-sweeping operation is applied to PDCCH transmission, then paging reception reliability is improved, but transmission complexity and resource overhead increase
Solution Approach 1:
The base station determines the preferred beam for paging transmission in advance by monitoring uplink signals from the terminal. This preliminary beam determination allows the system to configure paging transmission resources and select the appropriate beam before actual paging occurs, eliminating the need for complex real-time beam sweeping during paging operations.
Solution Approach 2:
Uplink signals (SRS, PUSCH, PUCCH) serve as intermediaries to convey terminal location and channel state information. The base station uses these uplink signals to infer the optimal downlink beam for paging transmission, avoiding direct complex beam sweeping operations while ensuring reliable paging delivery through the intermediary information provided by uplink transmissions.
3Reliability
If beam failure detection threshold M is increased, then false beam failure detection is reduced, but beam recovery latency increases
Solution Approach 1:
The system establishes a preferred beam in advance based on uplink signal quality measurements before beam failure occurs. When beam failure is detected (after M consecutive failures), the pre-determined preferred beam can be immediately activated without requiring additional beam sweeping or selection procedures, thus reducing recovery latency while maintaining reliable failure detection through the threshold M mechanism.
Solution Approach 2:
The system dynamically adjusts beam selection based on real-time uplink signal quality. The preferred beam is determined adaptively from uplink measurements (SRS, PUSCH, PUCCH) and updated as channel conditions change. This dynamic approach allows the system to maintain accurate beam failure detection (through threshold M) while enabling fast recovery by having an already-selected preferred beam ready for immediate use.
Data Source
AI summary
A method of a base station may comprise: detecting a beam failure for a terminal; in response to detecting the beam failure, transmitting a beam recovery early indicator (BREI) to the terminal based on a beam sweeping scheme; receiving a BREI response from the terminal; and identifying a preferred beam of the terminal based on reception of the BREI response.