Beam Pair Link Switching for Low-Latency Beam Recovery
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Solution Overview
Problem
Beam recovery in high-frequency communication systems experiences long delays due to conventional methods requiring high-layer intervention and beam training for optimal beam finding after link deterioration, which disrupts service transmission.
Innovation Solution
A method for beam recovery processing involving a network-side device and mobile terminal that initiates a beam recovery mechanism based on measurement results of downlink or uplink reference signals, using indication messages to switch to new beam pair links (BPLs) for data transmission, including beam reporting and local beam training to optimize beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional beam recovery methods are used with high-layer intervention and beam training, then optimal beam finding is achieved, but beam recovery delay increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple beam pair links (BPLs) between transmission and reception points before beam recovery is needed. When beam failure occurs, the system can immediately switch to a pre-established alternative BPL without performing time-consuming beam training procedures, thus reducing recovery delay while maintaining connection reliability
Solution Approach 2:
The patent skips the conventional beam training process by directly switching to alternative pre-established beam pair links. This rushing through of the recovery process eliminates the time-consuming beam training phase while still achieving beam recovery through pre-prepared alternative paths
2Reliability
If high-layer RRC reestablishment is initiated for beam recovery, then link reliability is improved, but service transmission delay increases
Solution Approach 1:
The patent segments the beam recovery process from the conventional RRC reestablishment procedure. Instead of initiating full high-layer RRC reestablishment, the system performs a simplified recovery by switching between pre-established beam pair links at the physical layer, separating the recovery function from the complex reestablishment protocol
Solution Approach 2:
The patent extracts the essential beam switching function from the complex RRC reestablishment process. By taking out only the necessary beam pair link switching operation and eliminating unnecessary higher-layer procedures, the system achieves reliable beam recovery with minimal delay
3Adaptability or versatility
If multiple beam pair links are established between transmission and reception points, then beam recovery flexibility is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple beam pair links during normal operation. These alternative BPLs are prepared in advance and stored for quick switching, enabling flexible beam recovery without increasing real-time system complexity during the recovery process itself
Data Source
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AI summary
A method for beam recovery processing, a network-side device, and a mobile terminal are provided. The method includes: transmitting, by a network-side device, a first indication message to a mobile terminal in response to that a preset trigger condition is met, where the first indication message is used to indicate a new beam pair link BPL, and the preset trigger condition includes that a beam recovery mechanism is determined to be initiated by the mobile terminal based on a measurement result of a downlink reference signal or a beam recovery mechanism is determined to be initiated by the network-side device based on a measurement result of an uplink reference signal; and switching to the new BPL for data transmission.