UE PDSCH Scheduling Offset for Power Management
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Solution Overview
Problem
In the context of 5G wireless communication systems, there is a need to optimize power consumption in user equipment (UE) during the transmission and reception of downlink signals, particularly in scenarios where efficient resource allocation and buffering strategies are essential to manage latency and reliability.
Innovation Solution
The method involves a user equipment (UE) receiving physical downlink shared channel (PDSCH) information by utilizing a PDSCH time-domain resource assignment table, with the ability to buffer signals based on candidate resource assignments that include a minimum offset value, allowing for flexible scheduling related to system information, random access responses, or paging, and optimizing power consumption by controlling when and how PDSCH is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE receives PDSCH based on candidate time-domain resource assignment information with offset values less than the minimum offset value, then the scheduling flexibility and latency are improved, but the power consumption increases due to frequent wake-up and signal reception
Solution Approach 1:
The patent changes the offset value parameter in time-domain resource assignment information to control the timing relationship between PDCCH and PDSCH. By setting a minimum offset value (e.g., K0 ≥ 1), the system ensures sufficient time for UE processing while allowing flexible scheduling. This parameter adjustment resolves the contradiction by enabling latency optimization when offset ≥ minimum offset, while power consumption is managed through the same parameter mechanism.
Solution Approach 2:
The patent dynamically adjusts the UE's reception behavior based on the offset value relative to the minimum offset value. When offset ≥ minimum offset, UE can enter sleep mode or buffer signals; when offset < minimum offset, UE must wake up to receive PDSCH. This dynamic adaptation allows the system to balance latency and power consumption based on real-time scheduling requirements.
2Use of energy by moving object
If the UE buffers downlink signals for a longer duration to save power, then the power consumption is reduced, but the latency and reliability of time-sensitive communications deteriorate
Solution Approach 1:
The minimum offset value parameter controls the buffer duration by defining the minimum time between PDCCH and PDSCH. By adjusting this parameter, the system balances power savings from buffering against the reliability requirements of time-sensitive communications. The parameter acts as a threshold that ensures sufficient processing time while enabling power-efficient buffering strategies.
Solution Approach 2:
The UE performs preliminary actions (buffering signals) in advance based on the minimum offset value configuration. This preliminary buffering allows the UE to save power by avoiding frequent wake-ups, while the minimum offset value ensures that the buffering duration is sufficient for reliable reception of time-sensitive data. The preliminary action is constrained by the parameter to maintain reliability.
3Adaptability or versatility
If the UE monitors all candidate PDSCH resources without filtering by minimum offset value, then the scheduling flexibility is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The minimum offset value parameter serves as a filtering criterion that reduces the number of candidate PDSCH resources the UE must monitor. By comparing the offset value against the minimum offset value, the UE can exclude invalid candidates, thereby reducing processing overhead while maintaining scheduling flexibility for valid candidates. This parameter-based filtering resolves the contradiction between flexibility and complexity.
Solution Approach 2:
The patent extracts and removes candidate PDSCH resources that do not meet the minimum offset value requirement from the monitoring set. This extraction reduces the processing burden on the UE by eliminating invalid candidates, while the remaining candidates preserve the necessary scheduling flexibility. The minimum offset value parameter defines the extraction criterion.
Data Source
AI summary
A method of receiving a physical downlink shared channel (PDSCH) by a user equipment (UE) in a wireless communication system includes receiving first information about a PDSCH time-domain resource assignment table including a plurality of candidate PDSCH time-domain resource assignment information, receiving second information about a minimum offset value for an interval between a slot in which a physical downlink control channel (PDCCH) is received and a slot to which a PDSCH is allocated, and receiving the PDSCH based on candidate PDSCH time-domain resource assignment information including an offset value equal to or larger than the minimum offset value among the candidate PDSCH time-domain resource assignment information. The PDSCH is received based on one of the candidate PDSCH time-domain resource assignment information irrespective of the minimum offset value, based on a PDCCH for scheduling the PDSCH, being related to system information (SI), a random access response (RAR), or paging.