Long DRX Cycle Subframe Determination in UMTS Base Stations
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Solution Overview
Problem
In the context of UMTS, when a shorter DRX-On length is set, it is difficult to accurately determine which radio subframe the DRX-on is on, leading to low data processing efficiency due to the inability to precisely identify the radio subframe within a radio frame that may contain multiple subframes.
Innovation Solution
A method and system where a base station and user equipment receive long discontinuous reception parameters, including cycle length, receiving data length, and not receiving data length, to accurately determine the radio subframe for DRX-on by using timers and high-speed downlink shared channel-radio network temporary identifiers, allowing for precise scheduling and data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a shorter DRX-On length is set to save energy consumption, then energy efficiency is improved, but the ability to accurately determine which radio subframe DRX-on is on deteriorates, resulting in low data processing efficiency
Solution Approach 1:
The patent segments the DRX cycle into clearly defined components: DRX cycle length, DRX-on length, and DRX-off length. By introducing separate parameters for each segment and establishing explicit calculation formulas, the system can accurately determine the radio subframe for DRX-on even when the DRX-on length is shortened. This segmentation allows precise control and identification of each phase within the DRX cycle.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the DRX parameters (cycle length, on length, off length) and pre-calculating the DRX-on timing using the formula (SFN-H-RNTI+65536) mod DRX_cycle. This pre-establishment of parameters and calculation rules enables the system to determine the exact radio subframe for DRX-on in advance, maintaining measurement precision even with shorter DRX-on lengths.
2Loss of energy
If a shorter DRX-On length is set, then energy consumption is reduced, but data processing efficiency deteriorates due to inability to accurately identify the radio subframe
Solution Approach 1:
The patent divides the DRX operation into distinct segments with explicit parameters: DRX cycle length, DRX-on length, and DRX-off length. This segmentation allows the system to optimize the DRX-on length for energy savings while maintaining accurate identification of the radio subframe through separate timing calculation mechanisms, thus preserving data processing efficiency.
Solution Approach 2:
The patent replaces ambiguous mechanical timing determination with a precise mathematical calculation system. By using the formula (SFN-H-RNTI+65536) mod DRX_cycle to calculate DRX-on timing, the system substitutes imprecise time-based determination with exact arithmetic computation, enabling accurate radio subframe identification even with shortened DRX-on periods.
3Use of energy by moving object
If DRX cycle parameters are configured to save energy, then energy efficiency is improved, but scheduling precision deteriorates when multiple UEs share the same subframe
Solution Approach 1:
The patent applies local quality by allowing different UEs to have customized DRX parameter configurations (different cycle lengths, on lengths, off lengths) based on their specific requirements. This enables each UE to optimize its own energy efficiency while the network controller can schedule them on different radio subframes, maintaining scheduling precision even when multiple UEs are in DRX mode.
Solution Approach 2:
The network controller performs preliminary scheduling actions by pre-determining the DRX parameters and calculating the DRX-on timing for each UE before data transmission. This advance planning allows the controller to distribute multiple UEs across different radio subframes, preventing collisions and maintaining scheduling precision while enabling energy-efficient DRX operation.
Data Source
AI summary
Embodiments of the present invention provide a method includes: receiving, by a base station, a long DRX parameter sent by an RNC, where the long DRX parameter includes at least two of a cycle length of a long DRX cycle, a long DRX on length and a long DRX off length; determining, when the UE enters the CELL-FACH state, by the base station, and according to a first timer and a first preset duration corresponding to the first timer, that the UE enters the long DRX cycle; and determining, when the UE enters the long DRX cycle, by the base station, and according to the H-RNTI of the UE, the cycle length of the long DRX cycle and the long DRX on length, a radio subframe on which long DRX on of the UE is in the long DRX cycle.