D2D Discovery Announcement via Extra Measurement Bandwidth
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Solution Overview
Problem
In wireless communication systems, especially in D2D operations, wireless devices face challenges in performing discovery announcements on frequencies not listed in the system information, leading to insufficient measurement bandwidth information, which hinders efficient communication, particularly in public safety networks that require direct signal transmission and reception.
Innovation Solution
The method involves receiving additional measurement bandwidth information from the serving cell for frequencies not included in the initial system information, allowing the wireless device to perform discovery announcements based on this information, even when in an RRC idle or connected state, and selecting the appropriate cell for the announcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device performs discovery announcement on frequencies not listed in the system information, then the communication coverage and reliability are improved, but the device lacks measurement bandwidth information which prevents it from measuring and selecting appropriate cells
Solution Approach 1:
The network performs preliminary action by providing measurement bandwidth information for frequencies before the wireless device needs to perform discovery announcements. This advance provision of information allows the device to properly measure and evaluate frequencies even before they are explicitly listed in system information, thereby resolving the information gap that would otherwise prevent reliable communication on alternative frequencies.
2Quantity of substance
If the system information includes only listed frequencies for measurement, then the system information size is kept small, but the wireless device cannot perform discovery announcements on frequencies outside the list
Solution Approach 1:
The measurement bandwidth information serves multiple functions: it enables the wireless device to measure frequencies both within and outside the explicitly listed frequency range. This single piece of information provides universal support for discovery announcements across multiple frequencies without requiring the system information to be expanded to include every possible frequency detail, thus maintaining compact system information while enhancing frequency selection versatility.
3Adaptability or versatility
If the wireless device receives additional measurement bandwidth information separately, then the discovery announcement capability is enhanced, but the information reception complexity increases
Solution Approach 1:
The measurement bandwidth information is merged with existing system information structures and transmission mechanisms. By integrating the additional frequency measurement capabilities into the established information delivery framework rather than creating separate complex communication channels, the patent enhances discovery announcement capability while minimizing the increase in information reception complexity.
Data Source
AI summary
The present invention relates to a device-to device (D2D) operation method performed by a terminal in a wireless communication system. The method comprises: separately receiving, from a serving cell, measurement bandwidth information about a frequency not included in information indicative of a measurement object for the purpose of supporting the mobility of the terminal; measuring the frequency not included in the measurement object for the purpose of supporting the mobility on the basis of the measurement bandwidth information; selecting a cell on the frequency; and performing discovery announcement on the cell.