Network-Initiated Beam Pair Link Reselection
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Solution Overview
Problem
Current beam failure recovery procedures in wireless communication networks are initiated only when the wireless device becomes unreachable, are device-initiated and unpredictable, leading to performance degradation in high load scenarios, and lack a mechanism for proactive re-establishment of beam pair links.
Innovation Solution
Implementing a network-initiated procedure that selects and updates transmitter and receiver configurations based on spatial quasi co-location assumptions to preemptively realign beam pair links, ensuring continuous availability and reducing latency by scheduling reselection commands appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-initiated beam failure recovery procedure is used, then beam failure can be recovered, but the procedure becomes unpredictable and causes performance degradation in high load scenarios
Solution Approach 1:
The patent inverts the traditional device-initiated beam failure recovery approach by implementing network-initiated reselection. Instead of waiting for the device to detect and report beam failure, the network proactively monitors uplink signal quality and triggers reselection commands, making the procedure predictable and controllable while maintaining reliability
2Reliability
If device-initiated beam failure recovery is implemented, then beam recovery is achieved, but PRACH resource contention increases in high load scenarios
Solution Approach 1:
The network performs preliminary monitoring of uplink signal quality before beam failure occurs and proactively initiates reselection commands. This preliminary action prevents the need for simultaneous PRACH transmissions from multiple devices experiencing beam failure, thereby reducing resource contention and improving overall system productivity
3Reliability
If reactive beam failure recovery is used, then beam failure can be recovered, but latency increases due to delayed re-establishment
Solution Approach 1:
The network continuously monitors uplink signal quality and detects degradation trends before complete beam failure occurs. By initiating reselection commands proactively based on this preliminary detection, the system reduces the time required for beam pair link re-establishment while maintaining reliable communication
4Ease of operation
If network-initiated reselection procedure is implemented, then predictability and efficiency are improved, but system complexity increases
Solution Approach 1:
The network leverages existing uplink signal quality measurements and monitoring mechanisms to initiate reselection decisions. By utilizing already-available channel state information and quality metrics, the system achieves predictable and efficient beam management without requiring complex additional hardware or processing infrastructure
Data Source
AI summary
A network initiated procedure is introduced for updating an SS-BPL once the gNB TX beam and wireless device RX beam start to become misaligned due to movement/rotation of the wireless device. When the gNB measures and determines that a re-establishment of the SS-BPL should be performed, the gNB transmits a trigger signal to the wireless device to update the SS-BPL. In one embodiment, the trigger signal may initiate a new SS block measurement by the wireless device, and a transmission of an uplink signal (e.g., a PRACH transmission) to indicate to the gNB the new preferred SS block and thus a new SS-BPL. In another embodiment, the gNB determines a new SS block for the wireless device and indicates directly in a message from gNB to wireless device an SS block selected by the gNB to use for SS-BPL in subsequent transmissions.