D2D Terminal Access Information Sharing
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Solution Overview
Problem
In wireless communication systems, terminal devices face delays when obtaining access information such as system information and timing advance (TA) from network devices, which affects initial access to the system, particularly in scenarios where network devices broadcast this information in fixed cycles.
Innovation Solution
A method for device-to-device (D2D) communication where terminal devices share access information, including system information and TA values, with each other to reduce the delay associated with obtaining these details from network devices, allowing them to determine and use the shared information for accessing cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices obtain access information from network devices through fixed-cycle broadcasting, then the network device can provide system information and timing advance values to terminals, but this results in access delay for terminal devices
Solution Approach 1:
Terminal devices that have already obtained access information from network devices perform preliminary actions by storing this information and preparing to share it with other terminals. This preliminary preparation enables subsequent terminals to quickly acquire access information through D2D communication without waiting for the next broadcast cycle, thereby reducing access delay while maintaining information reliability
Solution Approach 2:
Already-connected terminal devices serve as intermediaries between the network device and new accessing terminals. These intermediary terminals relay access information (system information and timing advance values) to new terminals through D2D communication, eliminating the need for new terminals to wait for network device broadcasts and significantly reducing access delay
2Reliability
If terminal devices wait for network device broadcasts to obtain access information, then the information is officially provided by the network, but this process generates delay affecting initial system access
Solution Approach 1:
Terminal devices create copies of the access information (system information and timing advance values) received from network devices and share these copies with other terminals through D2D communication. This copying mechanism allows new terminals to immediately obtain access information without waiting for official network broadcasts, dramatically improving initial access speed while the information content remains reliable and accurate
3Device complexity
If the network device broadcasts system information in fixed cycles, then the network can manage information distribution centrally, but terminals experience delay when arriving between broadcast cycles
Solution Approach 1:
The patent introduces a new dimension of information distribution by adding D2D communication channels alongside the traditional network device broadcast channel. This creates a multi-dimensional information acquisition path where terminals can obtain access information either from network broadcasts or from nearby connected terminals, eliminating the waiting time issue caused by fixed-cycle broadcasting while the network maintains centralized management of the original information source
Data Source
AI summary
Embodiments of the present disclosure provide a method for device-to-device (D2D) communication and a terminal device. The method includes: determining first access information by a first terminal device, the first access information being used to access a first cell; and sending the first access information by the first terminal device, causing a second terminal device to determine, based on the first access information as received, second access information used by the second terminal device to access a second cell. Thus, different terminal devices obtain access information used for accessing a cell by way of D2D communication, which can reduce delay generated by obtaining the access information from a network device by a terminal device.