Direct Communication Paging via Cell-Aware Discovery Messages
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Solution Overview
Problem
In 3GPP LTE Rel.12 systems, direct communication between user equipment (D2D ProSe) leads to unnecessary resource waste due to network devices paging multiple cells in a tracking area list without knowing the current cell location of user equipment, causing inefficient resource utilization.
Innovation Solution
User equipment sends a discovery message indicating its cell information, allowing the network device to send a paging message only to the correct cell, thereby narrowing the paging range and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device pages multiple cells in the tracking area list to locate user equipment, then the user equipment can be found, but network resources are wasted due to paging in unnecessary cells
Solution Approach 1:
The invention applies preliminary action by having the user equipment include its current cell information in the discovery message before the paging process occurs. This allows the network device to have advance knowledge of the user equipment's location, eliminating the need to page multiple cells and thus preventing resource waste while ensuring reliable location determination.
Solution Approach 2:
The discovery message serves as an intermediary that carries cell information from the user equipment to the network device. This intermediary mechanism enables the network device to obtain location information without having to page multiple cells, resolving the contradiction between reliable location determination and resource efficiency.
2Reliability
If the network device pages all cells in the tracking area list, then no user equipment location is missed, but the paging process becomes inefficient and consumes excessive resources
Solution Approach 1:
By including current cell information in the discovery message before paging, the system performs preliminary location identification. This allows the network device to skip the inefficient process of paging all cells in the tracking area list while ensuring that the user equipment is not missed, thus improving paging efficiency without sacrificing coverage.
Solution Approach 2:
The invention extracts the cell information from the user equipment and includes it in the discovery message. This extraction allows the network device to identify the specific cell where the user equipment is located without having to page all cells in the tracking area list, thereby improving paging efficiency while maintaining reliable coverage.
3Stability of the object's composition
If the tracking area list is not updated during cell reselection, then the user equipment can maintain connectivity, but the network device cannot determine the current cell location
Solution Approach 1:
The discovery message acts as an intermediary that carries current cell location information from the user equipment to the network device. This allows the tracking area list to remain stable without frequent updates while still providing the network device with accurate current cell location information through the discovery message mechanism.
Solution Approach 2:
The invention implements feedback by having the user equipment provide its current cell information in the discovery message to the network device. This feedback mechanism ensures that the network device always has up-to-date location information without requiring frequent tracking area list updates, thus maintaining stability while preventing information loss.
Data Source
AI summary
Embodiments relate to a communication method, user equipment, and a network device. A discovery message sent by second user equipment indicates cell information of the user equipment, so that first user equipment that receives the discovery message sends a communication request to a network device according to the discovery message. The communication request indicates the cell information of the second user equipment. The network device sends a paging message to the second user equipment according to a cell message of the second user equipment, which saves resources in a paging process of direct communication.