ABS Subframe Handling for Wireless Communication Power Optimization
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Solution Overview
Problem
In wireless communication systems, especially in LTE and LTE-Advanced, the handling of Almost Blank Subframes (ABS) leads to uncertainty for mobile devices regarding transmission and reception, resulting in unnecessary power consumption and potential loss of important messages due to interference mitigation strategies.
Innovation Solution
The method involves configuring mobile devices by the network to either stop receiving or continue receiving packets during ABS subframes, depending on the priority, and synchronizing transmission and reception to avoid power wastage and maintain communication throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the network blanks ABS subframes to mitigate interference from macro cells to pico cells, then interference is reduced, but the UE cannot receive packets in those subframes causing potential loss of important messages
Solution Approach 1:
The subframe is segmented into two functional parts: a first portion that is blanked to mitigate interference, and a second portion that remains active for transmitting important messages such as HARQ feedback. This segmentation allows the ABS to simultaneously achieve interference mitigation while preserving essential communication functionality.
Solution Approach 2:
Different portions of the same subframe are assigned different qualities: the first portion has blanked transmission to reduce interference, while the second portion maintains normal transmission quality to ensure delivery of critical messages. This local differentiation resolves the contradiction between interference mitigation and message delivery.
2Use of energy by moving object
If the UE stops receiving packets in ABS subframes to save power, then power consumption is reduced, but important messages may be lost
Solution Approach 1:
The reception process is segmented by stopping reception only during the first portion of the ABS subframe while continuing reception during the second portion. This allows the UE to save power during the blanked interval while maintaining awareness of and ability to receive important messages transmitted in the active interval.
Solution Approach 2:
The network configures the UE in advance about the ABS subframe structure and which portions contain important messages. This preliminary configuration enables the UE to strategically adjust reception behavior, stopping power-intensive reception during blanked portions while maintaining reception during active portions to capture critical messages.
3Productivity
If the UE attempts to receive packets in ABS subframes, then communication continuity is maintained, but unnecessary power is consumed and NACK transmissions are wasted
Solution Approach 1:
The subframe is divided into a first portion for interference mitigation and a second portion for maintaining communication. The UE uses this segmentation to stop receiving during the first portion (avoiding power wastage) while actively receiving during the second portion (maintaining throughput for critical messages).
Solution Approach 2:
The UE autonomously determines when to stop and resume reception based on the ABS configuration and message priority. By self-managing reception behavior according to the segmented subframe structure, the UE optimizes both power consumption and communication effectiveness without requiring continuous network control.
Data Source
AI summary
A method of handling transmission and reception involving an almost blank subframes (ABS) subframe for a mobile device in a wireless communication system is disclosed. The method comprises the mobile device being configured the ABS subframe by a network of the wireless communication system; and the mobile device stopping receiving a first packet transmitted by the network in a subframe, when the subframe is the ABS subframe.