Cluster Head Random Access for Wireless UE Groups
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Solution Overview
Problem
In wireless communication systems, cluster members in high-speed vehicles face challenges in completing data downloads due to the high moving speed, small coverage of roadside units, and large data volumes, leading to increased signaling overhead and collisions during the random access process when establishing connections with a base station.
Innovation Solution
A random access method where a cluster head selects a preamble that matches the number of cluster members, allowing the base station to allocate corresponding resources and temporary identifiers, enabling simultaneous connection establishment by cluster members without sequential competition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cluster members separately perform random access processes to establish connections with the base station, then each cluster member can establish its own connection, but the signaling overhead increases and collision probability increases
Solution Approach 1:
The patent merges multiple cluster members' random access processes into a single representative random access process. The cluster head performs random access on behalf of the entire cluster, and the base station allocates resources for all cluster members simultaneously. This combining approach reduces signaling overhead and collision probability while maintaining reliable connection establishment for all cluster members.
2Productivity
If cluster members separately perform random access processes, then individual connections can be established, but the data download efficiency decreases due to sequential access
Solution Approach 1:
The patent implements preliminary action by having the cluster head perform random access in advance on behalf of all cluster members. The base station pre-allocates resources and provides timing advance information before the actual data download begins. This allows all cluster members to establish connections simultaneously without sequential delays, improving data download efficiency.
3Speed
If multiple cluster members transmit preambles simultaneously, then connection establishment speed increases, but collision probability increases
Solution Approach 1:
The patent extracts the random access function from individual cluster members and concentrates it in the cluster head only. By taking out the random access process from multiple members and assigning it to a single representative, the system achieves fast connection establishment without collision, as only one preamble transmission is needed per cluster.
4Device complexity
If the base station processes each cluster member's random access separately, then individual resource allocation is precise, but system overhead increases
Solution Approach 1:
The patent merges multiple individual resource allocation processes into a single batch allocation process. The base station receives one random access request from the cluster head and allocates resources for all cluster members simultaneously. This combining approach reduces base station processing complexity while maintaining precise resource allocation and improving system throughput.
Data Source
AI summary
Provided are a random access method and apparatus. The method can include: a first cluster head in a first cluster formed by multiple UEs selects a preamble from a preset preamble set, and transmits the preamble to a base station, each preamble in the preamble set indicating the number of UEs corresponding to the each preamble, and the number of UEs corresponding to the selected preamble being equal to the number of cluster members in the first cluster; the first cluster head receives a response message transmitted by the base station in response to the preamble; and the first cluster head broadcasts, to each cluster member in the first cluster, the resource information for establishing the RRC connection and the C-RNTI.