Beam-Based Uplink Scheduling for Fast Beam Switching
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Solution Overview
Problem
Existing beam-based transmission in millimeter-wave networks face challenges such as uplink beam misalignment and inefficient resource allocation, leading to high latency and low reliability in uplink data transmission.
Innovation Solution
Assign preconfigured resources for scheduling occasions that are mapped to specific beams, allowing UEs to select resources based on downlink radio quality and share resources with other UEs, reducing beam misalignment and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beam-based transmission is used in millimeter-wave networks, then pathloss is mitigated and data rates are improved, but uplink beam misalignment occurs and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple uplink resources associated with different SSBs before actual data transmission. When a UE moves out of coverage of its current beam, it can immediately use a pre-configured resource associated with a different SSB without waiting for new configuration, thus preventing beam misalignment and maintaining transmission reliability.
2Device complexity
If traditional scheduling is used, then resource allocation is simple, but latency increases and transmission efficiency decreases
Solution Approach 1:
The patent pre-configures multiple uplink resources associated with different SSBs and beam failure recovery parameters before transmission needs occur. This allows UEs to quickly switch to alternative resources when beam failure is detected, reducing latency without requiring complex real-time scheduling decisions.
Solution Approach 2:
The patent introduces dynamic beam failure recovery mechanisms where UEs can autonomously select from pre-configured resources based on current beam conditions. This dynamic adaptation allows the system to respond quickly to changing wireless conditions while maintaining relatively simple overall scheduling architecture.
3Reliability
If dedicated uplink resources are allocated to each UE, then transmission reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent makes uplink resources universal by associating each uplink resource with multiple SSBs. This allows the same uplink resource to be used by multiple UEs depending on which SSB they are connected to, improving resource utilization efficiency while maintaining reliable dedicated access for each UE through their specific SSB associations.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device comprises obtaining an indication of an initial resource region. The initial resource region comprising time frequency resources, wherein the time frequency resources are divided into a plurality of scheduling occasions (SOs) and each of the plurality of SOs is associated with an uplink beam. The method further comprises: determining the wireless device has moved out of coverage of a first beam and that uplink resources associated with the first beam should no longer be used; selecting a second beam for uplink transmission; selecting a SO associated with the second beam from the initial resource region; and transmitting an initial transmission of uplink data in the selected SO using the second beam.