Dual Carrier DRX Pattern Synchronization in DC-HSDPA
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Solution Overview
Problem
Current wireless communication technologies lack a mechanism to handle Discontinuous Reception (DRX) operations in Dual Cell High Speed Downlink Packet Access (DC-HSDPA) mode and fail to indicate which carrier the associated High-Speed Physical Downlink Shared Channel (HS-PDSCH) is transmitted on when only one carrier is used.
Innovation Solution
A method and apparatus for a Wireless Transmit/Receive Unit (WTRU) to simultaneously receive on two carriers and perform DRX in DC-HSDPA, activating or de-activating DRX on both anchor and supplementary carriers based on received messages, using HS-SCCH orders, and aligning or offsetting DRX patterns to optimize power consumption and data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX operations are implemented in DC-HSDPA mode, then power consumption is reduced and battery life is improved, but the device complexity and signaling requirements increase
Solution Approach 1:
The patent segments DRX operations into separate patterns for anchor carrier and supplementary carrier, allowing independent configuration and management of DRX cycles on each carrier. This segmentation enables the device to apply different DRX strategies to different carriers, reducing overall power consumption while maintaining manageable complexity through modular control
Solution Approach 2:
The patent creates a universal DRX mechanism that works across both single-carrier and dual-carrier modes. The same DRX framework can be applied whether the device is operating on one carrier or two carriers simultaneously, providing a multi-functional solution that reduces power consumption without requiring entirely separate control mechanisms for different operating modes
2Ease of operation
If DRX patterns are aligned across both carriers, then device complexity is reduced and operation is simplified, but power saving opportunities are limited compared to independent DRX patterns
Solution Approach 1:
The patent implements dynamic DRX pattern configuration where the device can adaptively switch between aligned and independent DRX patterns based on traffic conditions and power requirements. The system dynamically adjusts the DRX behavior of each carrier independently, allowing optimization of power savings while maintaining operational simplicity when conditions permit
Solution Approach 2:
The patent changes the operational parameters of DRX patterns by allowing independent configuration of DRX cycle lengths, offsets, and activation conditions for each carrier. This parameter flexibility enables the system to achieve better power savings by staggering DRX patterns when beneficial, while still allowing alignment when operational simplicity is prioritized
3Reliability
If carrier indication is provided for HS-PDSCH, then data transmission reliability is improved, but signaling overhead and message complexity increase
Solution Approach 1:
The patent introduces an intermediary carrier indication mechanism that acts as a mediator between the network and the device. Rather than requiring complex explicit signaling for every HS-PDSCH transmission, the carrier indication serves as an intermediary signal that efficiently directs the device to the correct carrier for data reception, improving reliability while minimizing signaling overhead through compact indication methods
Data Source
AI summary
A method and an apparatus for simultaneously receiving on two carriers and performing discontinuous transmission (DTX) and discontinuous reception (DRX) in dual cell high speed downlink packet access (DC-HSDPA) are disclosed. A wireless transmit/receive unit (WTRU) receives a message for activating DRX for at least one of an anchor carrier and a supplementary carrier and applies the same DRX pattern to the anchor carrier and the supplementary carrier upon reception of the message. The message may be received via a high speed shared control channel (HS-SCCH) order. The WTRU may activate or de-activate the supplementary carrier based on the physical layer signal. Upon activation of the supplementary carrier, the WTRU may apply the same DRX pattern on both the anchor carrier and the supplementary carrier. The WTRU may flush a hybrid automatic repeat request (HARQ) buffer associated with the supplementary carrier upon de-activation of the supplementary carrier.