Beam-Based Sidelink Grant Regeneration Under HARQ Process Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam-based grants in FR2 sidelink communication due to the limitation of maintaining a maximum number of HARQ processes, leading to potential delays and inefficient resource usage when beam pairings exceed the maximum number of HARQ processes.
Innovation Solution
A method for (re)selecting or (re)creating sidelink grants based on specific beams by releasing HARQ processes when the number of HARQ processes reaches a threshold, allowing for new beam pairings and efficient resource utilization in FR2 operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the maximum number of HARQ processes is maintained to support multiple beam pairings, then beam diversity is improved, but system complexity and resource management difficulty increase
Solution Approach 1:
The patent implements dynamic HARQ process management where the system can flexibly allocate and release HARQ processes based on actual beam pairing needs. When a beam pairing is established, corresponding HARQ processes are allocated; when beam conditions change or resources are needed, processes are released. This dynamic approach allows the system to adapt to varying beam diversity requirements without maintaining a fixed maximum number of HARQ processes, thereby reducing management complexity while preserving beam diversity capability.
2Adaptability or versatility
If beam pairings exceed the maximum number of HARQ processes, then communication coverage is improved, but transmission delays increase
Solution Approach 1:
The patent employs preliminary action by pre-establishing a pool of available HARQ processes and pre-defining the mapping between beam pairings and HARQ processes. When a beam pairing is needed, the system can quickly allocate an available HARQ process from the pool without waiting for process creation or initialization. This preliminary preparation allows the system to handle multiple beam pairings simultaneously, expanding communication coverage while minimizing transmission delays through rapid HARQ process allocation.
Solution Approach 2:
The patent implements discarding and recovering of HARQ processes based on beam condition changes. When beam conditions deteriorate or resources are needed for other beam pairings, the system can discard (release) unused HARQ processes and recover them when needed. This mechanism allows the system to maintain communication coverage by reallocating HARQ processes to different beam pairings as conditions change, preventing permanent delays while ensuring continuous communication capability.
3Productivity
If HARQ processes are released to accommodate new beam pairings, then resource utilization is improved, but data retransmission opportunities are reduced
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors beam conditions, signal quality, and HARQ process status. Based on this feedback, the system makes informed decisions about when to allocate, hold, or release HARQ processes. When feedback indicates that a beam pairing is no longer optimal or that resources are better utilized elsewhere, the system can release HARQ processes. Conversely, when feedback shows stable beam conditions, the system maintains HARQ processes to ensure reliable retransmissions. This feedback-driven approach balances resource utilization with data retransmission reliability.
Data Source
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AI summary
A method for performing wireless communication by a first device, and an apparatus for supporting same are provided. The method may comprise the steps of: generating multiple grants on the basis of multiple beams; generating a first grant other than the multiple grants on the basis that a first beam other than the multiple beams is not covered by the multiple beams; and performing transmission to a second device on the basis of the first grant. For example, the first grant may be generated by releasing the multiple grants on the basis that the number of multiple hybrid automatic repeat request (HARQ) processes related to the multiple grants reaches a first threshold value.