D2D Discovery Resource Allocation via Network Notification
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Solution Overview
Problem
In communication systems supporting device-to-device (D2D) schemes, there is a need for efficient allocation and management of dedicated discovery resources to avoid collisions and ensure that receiving D2D UEs receive intended discovery information, as existing methods require new buffer status report formats, downlink control information, and radio network temporary identifiers, and lack efficient ways to notify receiving UEs about dedicated discovery resources.
Innovation Solution
A method and apparatus for allocating and managing dedicated discovery resources in a D2D communication system, where a D2D UE determines if it can request a discovery resource from the network, transmits a discovery resource request message, and receives a response with allocated resource information, allowing for efficient resource allocation and notification to receiving UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pool of resources is reserved for D2D direct discovery process and TX D2D UE randomly selects a resource, then resource allocation is simple, but collision among discovery signals occurs
Solution Approach 1:
The network entity acts as an intermediary to allocate dedicated discovery resources to TX D2D UEs. Instead of random selection from a pool, the network entity assigns specific resources to specific UEs, eliminating collisions while maintaining systematic control over resource distribution
Solution Approach 2:
The system changes the resource allocation parameter from random selection to dedicated assignment. Each TX D2D UE is assigned a unique discovery resource by the network entity, transforming the allocation mechanism from probabilistic to deterministic, thereby preventing signal collisions
2Reliability
If dedicated discovery resource is allocated to TX D2D UE, then collision among discovery signals is avoided, but monitoring overhead for receiving UEs increases
Solution Approach 1:
The patent extracts and removes unnecessary monitoring requirements for RX D2D UEs. By implementing a notification mechanism where the network entity informs RX UEs about the dedicated resources allocated to their interested TX UEs, RX UEs no longer need to monitor all discovery resources, significantly reducing their monitoring overhead
Solution Approach 2:
The network entity implements a feedback mechanism by notifying RX D2D UEs about the dedicated discovery resources allocated to TX D2D UEs they are interested in. This feedback allows RX UEs to adjust their monitoring behavior accordingly, reducing unnecessary monitoring while ensuring they receive relevant discovery information
3Extent of automation
If new BSR format, DCI format, and RNTI are introduced for dedicated resource allocation, then resource allocation control is improved, but device complexity increases
Solution Approach 1:
The patent utilizes existing communication protocols and message formats for resource allocation. The discovery resource request and response messages leverage established uplink and downlink communication mechanisms, avoiding the need for entirely new protocol formats and reducing implementation complexity while maintaining automated control
Data Source
AI summary
A method for being allocated a discovery resource by a user equipment (UE) in a communication system supporting a device to device (D2D) scheme is provided. The method includes determining whether a discovery resource request message may be transmitted to a network entity; transmitting the discovery resource request message to the network entity based on the determining result; and receiving a discovery resource response message as a response message to the discovery resource request message from the network entity.