Relay Node User Plane Support for IP Relay Delay Mitigation
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Solution Overview
Problem
Wireless communication systems face limitations in network capacity and coverage due to the restricted number of radio bearers that relay nodes can establish with donor access points, leading to delayed data processing and potential communication degradation for mobile devices near the edge of coverage or in high-traffic areas.
Innovation Solution
The method involves transmitting Service Data Units (SDUs) from a donor access point to a relay node, where they are processed into Protocol Data Units (PDUs) and delivered to the upper communication layer regardless of sequence numbers, allowing out-of-order communication and reducing delays by enabling immediate processing of data from one device while others' data is still being received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay nodes wait for in-sequence SDUs before processing data, then communication order is maintained, but data processing delays increase and network capacity is reduced
Solution Approach 1:
The relay node performs preliminary actions by receiving and buffering out-of-sequence SDUs before the expected in-sequence SDU arrives. When the missing SDU is received, the relay node can immediately process all buffered SDUs in sequence without waiting for each individual SDU, thus maintaining order while reducing overall delay
Solution Approach 2:
The patent introduces an intermediary mechanism (the relay node's buffer and reordering function) between the donor eNB and UEs. This intermediary receives out-of-sequence data, reorders it, and delivers it sequentially to upper layers, allowing asynchronous reception while maintaining sequential processing
2Productivity
If relay nodes establish multiple radio bearers with donor access points, then network capacity increases, but device complexity and configuration difficulty increase
Solution Approach 1:
The relay node is designed with multi-functional capability to handle multiple SDUs from different bearers simultaneously. It can receive, buffer, reorder, and process data from multiple sources through a unified interface, eliminating the need for separate processing paths for each bearer and reducing configuration complexity
Solution Approach 2:
The patent merges multiple bearer handling functions into a single relay node infrastructure. Instead of requiring separate processing chains for each bearer, the relay node combines reception, buffering, reordering, and delivery functions into one unified system that handles multiple bearers efficiently
Data Source
AI summary
Systems and methodologies are described that facilitate providing user plane support for internet protocol (IP) relays. Service data units (SDU) received at a radio communication layer can be provided to an upper communication layer, such as a packet data convergence protocol (PDCP) layer, without regard to sequence numbers. The upper communication layer can handle reordering of the received protocol data units. Since communications related to a plurality of devices through one or more IP relays can be mapped over a single bearer, allowing reordering at the upper communication layer can mitigate delay caused where a donor or other upstream access point is delayed in providing a sequential SDU related to one of a plurality of devices downstream. In this regard, SDUs related to other devices can be processed by the upper communication layer while waiting for the sequential SDU.