UE Connected Mode Bundled Transmission Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing bundled transmissions, particularly in connected mode operations, where power consumption and signaling overhead are high due to the need for continuous monitoring of control channels across multiple subframes, leading to increased latency and packet loss in VoIP and low-rate data transmissions.
Innovation Solution
The proposed solution involves determining the optimal start time for monitoring bundled control channels by restricting downlink and uplink grants, allowing the UE to align its DRX ON duration with the TTI bundling size, and using a grant indicator to signal when a bundled transmission is imminent, thereby reducing unnecessary wake-ups and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of control channels is performed across multiple subframes for bundled transmissions, then coverage is improved, but power consumption increases
Solution Approach 1:
The UE performs periodic monitoring of bundled control channels at specific intervals determined by the network, rather than continuous monitoring. The network configures monitoring parameters including periodicity and time offsets, allowing the UE to wake up only at scheduled times to monitor for bundled transmissions, thus reducing power consumption while maintaining coverage reliability.
Solution Approach 2:
The network provides advance configuration information to the UE about when bundled control channels will be transmitted, including timing offsets and periodicity. This allows the UE to prepare and wake up only at necessary times before actual transmissions occur, avoiding continuous monitoring and reducing power consumption while ensuring coverage is maintained.
2Reliability
If continuous monitoring of control channels is performed across multiple subframes, then packet loss is reduced, but latency increases
Solution Approach 1:
The UE monitors bundled control channels periodically at configured intervals rather than continuously. This periodic monitoring reduces latency by allowing the UE to enter low-power states between monitoring occasions, while the network ensures reliable delivery by scheduling transmissions at these periodic intervals, thus reducing packet loss without incurring continuous monitoring latency.
Solution Approach 2:
The system uses feedback mechanisms where the network receives acknowledgment from the UE about successful reception of bundled control channels. If acknowledgment is not received, the network can retransmit or adjust monitoring configurations, ensuring packet loss is minimized while maintaining efficient periodic monitoring that reduces latency compared to continuous monitoring approaches.
3Loss of information
If continuous monitoring of control channels is performed, then signaling overhead is reduced, but power consumption increases
Solution Approach 1:
The network provides comprehensive configuration information in advance to the UE about bundled control channel monitoring, including periodicity, time offsets, and resource allocations. This preliminary configuration reduces the need for continuous signaling exchanges, allowing the UE to operate efficiently with pre-configured parameters and reducing both signaling overhead and power consumption.
Solution Approach 2:
The UE performs periodic monitoring based on pre-configured parameters rather than continuous monitoring requiring ongoing signaling. This periodic approach maintains efficient signaling overhead by using established configurations while significantly reducing power consumption by allowing the UE to sleep between periodic monitoring occasions.
4Use of energy by moving object
If DRX ON duration is aligned with TTI bundling size, then power consumption is reduced, but monitoring flexibility is reduced
Solution Approach 1:
The system allows dynamic adjustment of DRX ON duration and monitoring parameters based on network conditions and service requirements. The network can reconfigure monitoring periodicity, time offsets, and bundling sizes adaptively, enabling the UE to optimize power consumption while maintaining monitoring flexibility when needed. This dynamic reconfiguration capability resolves the contradiction by allowing both power-efficient operation and flexible adaptation to changing conditions.
Solution Approach 2:
The network can change monitoring parameters such as periodicity, time offsets, and bundling sizes based on service requirements. By dynamically adjusting these parameters, the system allows the UE to align DRX ON duration with TTI bundling size for power efficiency in stable conditions, while maintaining the ability to flexibly reconfigure parameters when adaptability is needed, thus resolving the contradiction between power consumption and monitoring flexibility.
Data Source
AI summary
Aspects of the present disclosure provided techniques that may be applied in systems that utilize bundled transmissions from a base station (e.g., an eNodeB) to a user equipment (UE), when a user equipment (UE) is in a connected mode of operation. An exemplary method performed by a UE for processing a downlink control channel sent as a bundled transmission over a bundle of subframes, comprises determining when to start monitoring for the control channel; and monitoring for the control channel in a limited number of downlink subframes, based on the determination.