UE PDSCH Reception Prioritization for Random Access
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in efficiently receiving multiple physical downlink shared channels (PDSCHs) simultaneously, especially when scheduled to receive both unicast and UE-group common PDSCHs in the same slot, exceeding its simultaneous reception capability, leading to dropped channels and inefficient resource management.
Innovation Solution
The UE prioritizes PDSCHs for random access procedures and determines priorities based on priority information in the downlink control information (DCI), selecting 'M' PDSCHs for random access and 'M-1' PDSCHs from the remaining channels, where 'M' corresponds to the UE's simultaneous reception capability, to optimize channel reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives multiple PDSCHs simultaneously in the same slot, then the data reception capacity is improved, but the UE's simultaneous reception capability is exceeded leading to dropped channels
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reception capability parameter based on the type of PDSCH. The UE determines its simultaneous reception capability by identifying PDSCHs of the first type (unicast) and PDSCHs of the second type (group common), then calculates the maximum number of PDSCHs it can receive simultaneously based on these classifications. This dynamic parameter adjustment allows the UE to manage its reception capacity efficiently without dropping channels.
Solution Approach 2:
The patent segments the PDSCH reception task by classifying PDSCHs into different types (first type for unicast, second type for group common services). This segmentation allows the UE to apply different reception strategies for different channel types, prioritizing group common PDSCHs when capability limits are reached, thereby maintaining reliable reception of critical channels while maximizing overall data reception capacity.
2Reliability
If the UE prioritizes PDSCH for random access procedure, then the random access reliability is improved, but other PDSCHs may be dropped
Solution Approach 1:
The patent applies preliminary action by establishing priority rules in advance before the actual reception occurs. The UE is configured to prioritize PDSCHs associated with random access procedures over other PDSCHs when simultaneous reception capability is exceeded. This pre-established priority framework ensures that critical random access channels are protected while maintaining efficient use of reception resources for other data channels.
3Reliability
If the UE receives all scheduled PDSCHs without dropping, then the completeness of data reception is improved, but the UE's simultaneous reception capability is exceeded
Solution Approach 1:
The patent uses parameter changes to simplify the reception management process. Instead of requiring complex decision-making for each PDSCH, the UE adjusts its simultaneous reception capability parameter based on the classified types of PDSCHs. This parameter-based approach provides a straightforward rule set for determining which PDSCHs to receive and which to drop, reducing management complexity while maintaining high reception completeness.
Data Source
AI summary
According to an embodiment of the present the UE can be scheduled to simultaneously receive one or more PDSCHs and one or more UE-group common PDSCHs at a same slot. When the simultaneously reception exceeds the UE's simultaneous reception capability, the UE may prioritizes a PDSCH for random access procedure over remaining PDSCHs, determine priorities of the remaining PDSCHs based on priority information in each DCI, and receive ‘M’ PDSCHs including the PDSCH for random access and ‘M−1’ PDSCHs selected from the remaining PDSCHs, where ‘M’ related to the UE's simultaneous reception capability.