D2D Cluster Head Location Registration for Idle Mode UEs
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in idle mode mobility management, particularly in location/tracking area updates and paging, which are conflicting and result in high signaling costs, especially when precise location registration is required for user equipment (UE) in device-to-device (D2D) communication.
Innovation Solution
Implementing a two-level location registration mechanism that combines multi-cell location registration with device-to-device (D2D) based location registration, allowing UE to join a device cluster for precise location tracking without additional signaling overhead, with the cluster head sending location update messages on behalf of idle mode UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional multi-cell location registration is used for idle mode UE, then location tracking coverage is provided, but signaling costs are high and location precision is insufficient for D2D communication
Solution Approach 1:
The patent introduces a D2D cluster head as an intermediary entity to perform location registration on behalf of idle mode UEs. The cluster head receives and processes location registration messages from the network, then forwards them to member UEs, eliminating the need for each UE to independently communicate with the network for location updates. This intermediary approach reduces signaling overhead while maintaining location tracking capability.
Solution Approach 2:
The patent implements a copying mechanism where the cluster head maintains a copy of location registration information for its member UEs. When location updates are needed, the cluster head uses its cached information and cluster identity to represent multiple UEs, rather than each UE maintaining separate location registration with the network. This copying approach significantly reduces the number of signaling messages required.
2Measurement precision
If frequent location updates are performed to maintain precise location tracking, then location precision is improved, but signaling overhead increases
Solution Approach 1:
The patent enables the D2D cluster to self-manage location registration for its member UEs. The cluster head autonomously handles location update messages from the network, processes them locally, and maintains location information for all cluster members without requiring each UE to independently interact with the network. This self-service mechanism reduces signaling overhead while maintaining precise location tracking within the cluster.
Solution Approach 2:
The patent merges the location registration functions of multiple idle mode UEs into a single cluster-level registration process. By combining the location management of multiple UEs under one cluster head, the system reduces redundant signaling messages. The cluster head represents all members in location registration interactions with the network, consolidating what would otherwise be multiple separate signaling operations into a single unified process.
3Reliability
If idle mode UE performs independent location registration, then individual location accuracy is maintained, but system efficiency decreases due to redundant signaling
Solution Approach 1:
The D2D cluster head serves as an intermediary that maintains reliable location registration for multiple UEs simultaneously. When the network needs to locate or communicate with idle mode UEs, it interacts with the cluster head, which then manages the location information for all cluster members. This intermediary approach maintains location registration reliability while improving system efficiency by eliminating redundant signaling between the network and each individual UE.
Solution Approach 2:
The cluster head performs multiple functions including location registration management, message forwarding, and cluster coordination for all member UEs. This multi-functional entity handles location registration for the entire cluster, providing universal service to all members. The cluster head's ability to represent multiple UEs in location registration interactions improves system efficiency while maintaining the reliability needed for D2D communication services.
Data Source
AI summary
The invention relates to device-to-device (D2D) communications an in particular to location registration of a D2D User Equipment (UE) being in idle mode. A D2D capable UE (D2D cluster head) is [1] configured to communicate with a communication network, is [2] able to establish D2D communication with another D2D capable UE, receives [3] from the communication system a configuration so as to send location update related messaging on behalf of UEs with which D2D communications has been established, obtains [4] information of a change of status of a UE regarding a D2D communication or a change of cell of a UE and in response to the information, causes [5] the sending of a message to the communication network, the message comprising a location update request regarding the UE.