Search Space Window Offset Control for Pre-Configured Uplink
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Solution Overview
Problem
In wireless networks, the energy consumption of user equipment (UE) is high due to prolonged monitoring of the physical downlink control channel (PDCCH) in the search space (SS) window for application layer responses after uplink transmissions on pre-configured resources, leading to battery drain, especially when application layer responses are delayed.
Innovation Solution
Implementing a configurable offset value to determine the starting position of the SS window based on the expected application layer response delay, allowing the UE to monitor the SS window efficiently and reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the search space window monitoring time is extended to cover application layer response delays, then the reliability of receiving application layer responses is improved, but the energy consumption of the UE increases
Solution Approach 1:
The network configures the UE with a pre-defined search space window duration and offset values before the uplink transmission occurs. This preliminary configuration allows the UE to know in advance when to start and stop monitoring, avoiding the need to extend monitoring indefinitely while ensuring the window covers the expected application layer response time. The configuration is provided through RRC signaling or MAC CE before the actual transmission.
Solution Approach 2:
The patent introduces configurable parameters (search space window duration, offset values) that can be adjusted by the network based on the specific service requirements and expected application layer response delays. By changing these parameters dynamically, the system can balance between ensuring reliable response reception and minimizing unnecessary monitoring time, thus optimizing energy consumption while maintaining reliability.
2Reliability
If the search space window is extended to monitor delayed application layer responses, then the completeness of receiving responses is improved, but the power consumption increases
Solution Approach 1:
The network provides preliminary configuration of the search space window parameters including duration and offset values before the UE performs uplink transmission. This allows the UE to establish a precise monitoring schedule in advance, ensuring it captures the application layer response without extending monitoring beyond what is necessary, thereby preventing energy waste while maintaining complete response reception.
Solution Approach 2:
The search space window configuration is made dynamic and adaptable to different service types and expected response delays. The network can adjust the window duration and offset based on real-time requirements, making the monitoring period neither too short (missing responses) nor too long (wasting energy). This dynamic adjustment optimizes the balance between response completeness and energy conservation.
3Loss of information
If pre-configured resources are used for frequent data transmissions, then the signaling overhead is reduced, but the relative energy consumption from monitoring PDCCH increases
Solution Approach 1:
The patent configures specific parameters for the search space window (duration, offset values) that are optimized for pre-configured resource scenarios. By adjusting these parameters, the system reduces the monitoring window size appropriately for frequent transmissions where application layer responses are expected to be relatively timely, thereby reducing the energy cost of monitoring while maintaining the signaling efficiency benefits of pre-configured resources.
Solution Approach 2:
The search space window configuration is tailored specifically for the pre-configured resource scenario rather than using a one-size-fits-all approach. The window duration and offset are locally optimized for this specific transmission mode, ensuring that monitoring effort is concentrated only where necessary to catch application layer responses, thus minimizing energy consumption from PDCCH monitoring while preserving the low-signaling advantage of pre-configured resources.
Data Source
AI summary
Embodiments include methods implemented in a wireless device for efficient energy consumption at the wireless device. In one embodiment, a method comprises performing an uplink transmission on pre-configured resources to a network node; and monitoring in a search space (SS) window for an application layer response from a network node downlink transmission based on an offset value indicating a time difference between the SS window and the uplink transmission on the pre-configured resources.