D2D Enabled and Group based RACH Access Sample Clauses

D2D Enabled and Group based RACH Access. Random access of a large number of devices will introduce new challenges to the 5G RAN design. Thus a new approach to address this problem in 5G is required. Here we discuss a potential solution especially for a group of devices that are static or semi-static. Devices in the same group uses unicast D2D communication or one-to-many/all D2D communication. Besides, a device, based on various criteria depending on particular deployment scenario, is selected as a group head or cluster head. Group head uses PC5* interface towards its directly connected devices for D2D discovery and/or communication. Group head uses Uu interface for communication with the 5G-RAN. In this case, instead of having all the group members to proceed in random access using one of the 64 preambles when they have to transmit, the transmission requests could be aggregated, and only one device (i.e. the group head) will perform the random access request. Thus instead of having all the devices competing for resources, only the group heads will compete. The technique has the potential to reduce the collision rate in the RACH. A slotted access scheme, where each device will be able to transmit according to its needs will further benefit the system. Group heads could further coordinate among each other by intra cluster communication i.e. D2D unicast communication or one-to-many communication among group heads, as depicted in Figure 6-1. Below are the main aspects of this scheme: a. The devices are being grouped by the network based on their mobility and communication characteristics (e.g., data to be transmitted, packet delay requirements) b. The network schedules the cluster heads’ transmission opportunities based on their transmission requirements. The scheduling information includes how many timeslots each device should attempt to access the network and also which preambles should be used. c. The intra cluster communication may take place either via a different interface e.g. IEEE 802.15/Xxxxxx or IEEE 802.11 or via D2D communication over 5G AIV. The collision rate is high since many devices compete for the same number of RACH preambles The collision rate is decreased since less devices compete for the same number of RACH preambles taking advantage to the group based system access Successful system access Collision in system access Successful system access through group Inactive device

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