Central Unit Broadcasting Downlink Data to Data Managers
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Solution Overview
Problem
In radio network systems, high-density small cell arrangements lead to increased interference, limiting the period available for downlink data transfer via Mobile Front-Haul (MFH) due to the need for synchronization with scheduling completion, resulting in inefficient bandwidth utilization.
Innovation Solution
A radio network system with a central unit broadcasting downlink data to data managers via MFH, allowing simultaneous scheduling and data transfer, where data managers accumulate and selectively transfer data to corresponding remote radio units based on allocation results, enabling data transfer during scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the CU waits for scheduling completion before transferring downlink data to RRUs, then the RRU can perform baseband processing with complete data, but the MFH transferable period becomes limited and bandwidth utilization decreases
Solution Approach 1:
The patent applies preliminary action by transferring downlink data from the CU to the RRU before the scheduling process is completed. The RRU receives and stores the data in advance, so when scheduling finishes and the allocation result is available, the data is already ready for immediate baseband processing and transmission. This eliminates the waiting period and extends the MFH transferable period, significantly improving bandwidth utilization while ensuring data completeness for processing.
2Device complexity
If multiple RRUs share MFH resources via TDM multiplexing, then the MFH infrastructure is economized, but the transferable period for each RRU is shortened further
Solution Approach 1:
The patent applies preliminary action by enabling each RRU to receive and store downlink data in advance during its allocated TDM time slots, before the scheduling completion. This allows the RRU to have data ready when needed, effectively utilizing the shared MFH resources without extending the physical infrastructure. The preliminary data reception and storage compensates for the limited transferable period imposed by TDM multiplexing, maintaining productivity while economizing on MFH infrastructure.
3Measurement precision
If the CU transfers data after scheduling completion, then data allocation accuracy is ensured, but transfer time increases and latency is introduced
Solution Approach 1:
The patent applies preliminary action by separating the data transfer function from the scheduling function. The CU transfers downlink data to the RRU in advance based on preliminary allocation information, before the final scheduling completion. The RRU stores this data and waits for the allocation result. When scheduling completes, the RRU already has the data ready, eliminating transfer latency. The allocation accuracy is maintained because the final scheduling result determines which stored data is actually used for transmission.
Solution Approach 2:
The patent applies segmentation by dividing the data transfer process into two independent phases: (1) preliminary data transfer from CU to RRU based on initial allocation, and (2) final data usage based on scheduling completion. This segmentation allows data to be transferred in advance without waiting for complete scheduling, reducing latency while maintaining allocation accuracy through the two-stage process.
Data Source
AI summary
A CU (Central Unit) executes scheduling for allocating radio resources of RRUs (Remote Radio Units) to radio transmission of downlink data while broadcasting, to DMs (Data Managers) via MFH, downlink data from MBH. Each DM selects, based on an allocation result obtained by scheduling, the downlink data of an RRU (Remote Radio Unit) corresponding to the self DM from the accumulated downlink data from the CU, and transfers the selected downlink data to the corresponding RRU while discarding the downlink data of other RRUs. Based on the allocation result, each RRU performs radio transmission of the downlink data from the DM to a corresponding UE (User Equipment) using the designated radio resource. This makes it possible to efficiently transfer the downlink data from the CU to each RRU via the MFH constructed by a TDM system represented by TDM-PON.