MAC Layer Pre-Filtering for D2D Discovery Signal Processing
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Solution Overview
Problem
The existing method for monitoring discovery information in device-to-device (D2D) wireless communication systems is inefficient, leading to increased processing burden and power consumption due to continuous monitoring and decoding of all discovery channels, which is not targeted and results in unnecessary processing of irrelevant data.
Innovation Solution
Implementing pre-filtering techniques at the medium access control (MAC) and physical (PHY) layers to selectively process and transmit discovery information based on pre-defined parameters such as application identifiers, discovery categories, and cyclic redundancy checks (CRC), allowing only relevant data to be processed and transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring and decoding of all discovery channels is performed, then discovery information can be received, but processing burden and power consumption increase
Solution Approach 1:
The patent applies preliminary action by performing pre-filtering at the PHY layer before full decoding at higher layers. Specifically, the PHY layer decodes only the first part of the discovery signal (e.g., preamble or header) to extract filtering criteria, then filters discovery channels based on these criteria before passing relevant signals to higher layers. This preliminary filtering action reduces the amount of data that needs to be fully processed and decoded, thereby reducing power consumption while maintaining reliable discovery information reception.
2Loss of information
If all discovery channels are monitored and decoded, then complete discovery information is obtained, but processing burden increases
Solution Approach 1:
The patent applies segmentation by dividing the discovery signal into multiple parts: a first part (preamble/header) containing filtering criteria and a second part (payload) containing actual discovery information. The PHY layer performs preliminary decoding only on the first part to extract filtering criteria, then uses these criteria to filter discovery channels. This segmentation allows the system to process only necessary portions of the signal, reducing processing burden while maintaining information completeness for relevant discoveries.
Solution Approach 2:
The patent applies preliminary action by performing pre-filtering at the PHY layer before full decoding at higher layers. Specifically, the PHY layer decodes only the first part of the discovery signal (e.g., preamble or header) to extract filtering criteria, then filters discovery channels based on these criteria before passing relevant signals to higher layers. This preliminary filtering action reduces the amount of data that needs to be fully processed and decoded, thereby reducing power consumption while maintaining reliable discovery information reception.
3Use of energy by moving object
If pre-filtering is implemented at MAC and PHY layers, then power consumption is reduced, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the discovery signal into multiple parts: a first part (preamble/header) containing filtering criteria and a second part (payload) containing actual discovery information. The PHY layer performs preliminary decoding only on the first part to extract filtering criteria, then uses these criteria to filter discovery channels. This segmentation allows the system to process only necessary portions of the signal, reducing processing burden while maintaining information completeness for relevant discoveries.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). A method and user equipment (UE) for transmitting and receiving discovery information in a wireless communication system supporting a proximity service are provided. The method for transmitting discovery information includes receiving, in a medium access control (MAC) layer, discovery information for discovery associated with the proximity service from a higher layer, generating, in the MAC layer, a MAC protocol data unit (PDU) including the received discovery information, and transmitting, in a physical (PHY) layer, a discovery signal including the generated MAC PDU.