Per-packet resource pool selection in LTE V2X system

#The present disclosure relates, in general, to wireless communications and, more particularly, per-packet resource pool selection in LTE V2X systems.

#During Release 12, the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard has been extended with support of device-to-device (D2D) (specified as “sidelink” or Proximity Services (ProSe)) features targeting both commercial and Public Safety applications. An example application enabled by Release 12 LTE is device discovery, where devices are able to sense the proximity of another device and associated application by broadcasting and detecting discovery messages that carry device and application identities. Another example application is direct communication based on physical channels terminated directly between devices.

#One of the potential extensions for the D2D is support of vehicle-to-anything-you-can-imagine (V2X) communication, which includes any combination of direct communication between vehicles, pedestrians and infrastructure. V2X communication may take advantage of a network infrastructure, when available, but at least basic V2X connectivity should be possible even in case of lack of coverage. Providing an LTE-based V2X interface may be economically advantageous because of the LTE economies of scale, and it may enable tighter integration between communications with the network infrastructure (V2I/V2N), vehicle-to-pedestrian (V2P) communications, and vehicle-to-vehicle (V2V) communications, as compared to using a dedicated V2X technology.

#For a more complete understanding of the disclosed embodiments and their features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:

#FIG. 1 is a block diagram illustrating an example embodiment of a network, in accordance with certain embodiments;

#FIG. 2 is a flow diagram of a method in a node, in accordance with certain embodiments;

#As described above, in order to secure QoS for different packets it is necessary for the access stratum to treat each packet from the application layer in a different way. Although PPPP has been proposed as a means to provide priority for ProSe communication, this approach is limited in some aspects and therefore not satisfactory for the V2x scenario. For example, to differentiate QoS for the various traffic types (e.g., V2V, V2P, V2I), the source and/or destination address/ID has to be taken as input factors, which is out of the scope of PPPP framework. Furthermore, PPPP is limited to the PC5 interface and UE-network relay (Uu-PC5 bearer mapping), while in a general case, both Uu and PC5 can be seen as an alternative route to deliver V2X messages and suffer from the impact of per-packet preference. The present disclosure contemplates various embodiments that may address these and other deficiencies associated with existing approaches.

#In order to address the above described deficiencies with existing approaches, certain embodiments comprise an inter-layer signaling mechanism, typically from higher layers to lower layers in the protocol stack, that may advantageously enable implementation of per-packet resource pool selection in V2X scenarios. As used herein, the resource pool is a general item that is not limited to the resource pool used for ProSe communication, but also includes the alternative of a resource pool for Uu-based message delivery.

#In certain embodiments, a tag is used that is per-packet defined and used by the access stratum to select a resource pool, which includes resource pools for both ProSe-based delivery and cellular-based delivery. For example, in certain embodiments a node generates a tag for an associated data packet at a first layer. The node may be any suitable entity. For example, and without limitation, in certain embodiments the node may be a wireless device or a network node (e.g., an RSU). In some cases, the first layer may be an application layer. The generated tag indicates one or more parameters related to transmission of the associated data packet. The node signals the tag from the first layer to another layer. At the another layer, the node maps the associated data packet to a logical channel based on the one or more parameters indicated by the tag. The node selects one or more resources for transmission of the associated data packet based on the mapping of the associated data packet to the logical channel. In certain embodiments, the node transmits the associated data packet using the one or more resources selected for transmission of the associated data packet.