Broadcast Redirect Information for Faster Cell Reselection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing cell selection and reselection procedures in LTE and NR networks involve substantial signaling delays due to unicast messaging, leading to prolonged latency and inefficient UE connections.
Innovation Solution
Broadcasting redirect information to User Equipments (UEs) in wireless communication networks, allowing UEs to perform cell selection or reselection procedures based on acquired broadcasted information, reducing the need for dedicated signaling and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If unicast messaging is used for cell release and redirect information, then specific system information can be transmitted to the UE, but substantial signaling delays occur and latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring UEs with redirect information and system information in advance through unicast RRC messages before the actual cell reselection is needed. This allows UEs to have the necessary information ready beforehand, reducing the signaling delay when cell reselection occurs. The network sends RRCRelease with redirect information and system information in advance, so UEs don't need to request this information later through additional signaling.
Solution Approach 2:
The patent uses copying by including complete system information copies within the RRCRelease message itself. Instead of requiring UEs to acquire system information separately through additional signaling, the network embeds the necessary system information blocks (SIBs) directly in the release message, allowing UEs to immediately use this copied information for cell reselection without waiting for separate system information transmissions.
2Ease of operation
If unicast messaging is used for release with redirect and resume with redirect procedures, then directed cell reselection can be achieved, but the number of signaling messages increases
Solution Approach 1:
The patent applies merging by combining multiple functions into a single RRCRelease message. Instead of sending separate messages for cell release, redirect information, and system information, the patent consolidates all these elements into one unified message. This reduces the total number of signaling messages while maintaining the directed cell reselection capability, as the single message contains both the redirect information and the necessary system information blocks.
3Reliability
If UEs wait for RRC Release with redirect information after random access, then connection establishment can be confirmed, but connection latency is prolonged
Solution Approach 1:
The patent applies preliminary action by providing UEs with redirect information and system information in advance through the RRCRelease message before the UE needs to establish a new connection. This allows UEs to prepare for cell reselection beforehand rather than waiting after random access, reducing connection latency while maintaining reliability. The network proactively sends the information needed for successful reconnection, so UEs don't need to wait and request it later.
Data Source
AI summary
A method for operating a User Equipment, UE, in a wireless communication network. The method includes acquiring broadcast information comprising redirection information and performing a cell selection or cell reselection procedure based on the acquired broadcasted information. A corresponding UE and a computer program are also disclosed. There is also disclosed a method for operating a network node serving a User Equipment, UE, in a wireless communication network. The method includes broadcasting information having redirection information enabling the UEs to perform a cell selection or cell reselection procedure. A corresponding network node and computer program are also disclosed.