D2D Radio Resource Allocation by Group Identifier
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Solution Overview
Problem
In ProSe direct discovery model B, multiple discoveree UEs may transmit responses simultaneously on the same radio resource, leading to potential failure in detection by the discoverer UE due to overlapping signals.
Innovation Solution
A base station allocates distinct radio resources to each UE based on their group identifiers, preventing simultaneous transmission on the same resource by considering the group identifiers during radio resource allocation for D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple discoveree UEs transmit responses simultaneously on the same radio resource, then the communication efficiency is improved, but the detection reliability deteriorates due to overlapping signals
Solution Approach 1:
The patent segments the radio resources by associating them with different group identifiers. Each discoveree UE is assigned radio resources corresponding to its group identifier, which divides the resource space and prevents overlapping transmissions from different UEs, thereby resolving the contradiction between communication efficiency and detection reliability
2Ease of operation
If radio resources are allocated without considering group identifiers, then the resource allocation simplicity is improved, but the signal overlap problem worsens leading to detection failure
Solution Approach 1:
The patent applies preliminary action by pre-associating radio resources with group identifiers before the actual discovery process. This preliminary association ensures that when discoveree UEs transmit responses, they automatically use non-overlapping resources based on their group identifiers, maintaining allocation simplicity while preventing signal overlap and detection failure
Data Source
AI summary
A base station (2) is configured to receive, from a first wireless terminal (1), a first group identifier indicating a first terminal group, and allocate, to the first wireless terminal (1), a second radio resource, rather than a first radio resource, for device-to-device (D2D) communication performed by the first wireless terminal (1). The first radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent the first group identifier. Meanwhile, the second radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent a second group identifier indicating a second terminal group different from the first terminal group. It is thus, for example, possible to preventing a plurality of D2D communication signals, which are transmitted from multiple wireless terminals to a single wireless terminal, from being transmitted on the same radio resource.