Relay Node R-PDCCH Access via Segmented Random Procedure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Relay Nodes (RNs) in LTE-Advanced systems face challenges in accessing the Relay Physical Downlink Control Channel (R-PDCCH) and performing subsequent normal transmission, with existing solutions being ineffective.
Innovation Solution
A method for RNs to monitor and access the R-PDCCH by sending dedicated random access preambles and receiving response messages, allowing them to acquire necessary resources and perform scheduled transmissions through the Relay Physical Uplink Shared Channel (R-PUSCH) and monitor Contention Resolution messages on the R-PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Relay Nodes use traditional random access procedure to access PDCCH, then initial access and synchronization can be achieved, but they cannot successfully access R-PDCCH and perform normal transmission
Solution Approach 1:
The patent segments the random access procedure into two distinct parts: a first random access procedure for initial access and synchronization, and a second random access procedure specifically for R-PDCCH access. This segmentation allows each procedure to be optimized for its specific function, enabling RNs to successfully access R-PDCCH and perform normal transmission.
Solution Approach 2:
The patent applies preliminary action by first enabling RNs to complete initial access and synchronization through the first random access procedure before initiating the second random access procedure for R-PDCCH access. This preliminary completion of basic connection establishment ensures that RNs are ready for the more specific R-PDCCH access task that follows.
2Adaptability or versatility
If Relay Nodes monitor PDCCH for Downlink Assignment and Uplink Grant, then compatibility with existing terminals is maintained, but transmission conflicts with terminal communications occur
Solution Approach 1:
The patent segments the channel monitoring function into two separate channels: PDCCH for terminal communications and R-PDCCH for relay node transmissions. By monitoring PDCCH for Downlink Assignment and Uplink Grant to maintain compatibility with existing terminals, while simultaneously monitoring R-PDCCH for relay-specific control information, the system avoids transmission conflicts and ensures reliable communication for both terminals and relay nodes.
3Ease of operation
If Relay Nodes access network using existing random access procedure, then initial access is achieved, but subsequent normal transmission cannot be performed
Solution Approach 1:
The patent segments the random access procedure into two distinct phases: a first random access procedure for initial access and synchronization, and a second random access procedure for R-PDCCH access and normal transmission. This segmentation maintains the simplicity of the access procedure while enabling full transmission capability, as each phase is optimized for its specific function.
Solution Approach 2:
The patent applies preliminary action by first completing initial access and synchronization through the first random access procedure before proceeding to the second procedure for R-PDCCH access. This preliminary completion establishes the basic connection, enabling subsequent normal transmission operations to proceed smoothly.
Data Source
AI summary
The present invention discloses methods for random access of a Relay Node (RN), which includes one method for random access wherein a RN monitors R-PDCCH and receives a random access response message according to a random access-radio network temporary identifier through the R-PDCCH. By the present invention, the random access procedure of the RN is achieved.