NR MBS Radio Bearer Setup via RRC and PDCP Configuration
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Solution Overview
Problem
Existing technologies have not adequately addressed efficient methods for receiving multicast/broadcast services (MBS) in New Radio (NR) cellular mobile communication systems, which require different core network considerations compared to Evolved Universal Terrestrial Radio Access (E-UTRA).
Innovation Solution
A terminal apparatus and base station apparatus are designed to establish a Packet Data Convergence Protocol (PDCP) entity for Multicast Broadcast Service (MBS) Radio Bearers (MRBs) via a Dedicated Control Channel (DCCH), with corresponding RRC messages for efficient MBS reception in NR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing MBMS transmission technologies (MBSFN or SC-PTM) are used in E-UTRA, then multicast/broadcast services can be provided, but the system requires different core network considerations and lacks efficient reception methods for NR
Solution Approach 1:
The patent applies universality by enabling the NR system to handle multicast/broadcast services using the same efficient reception mechanisms already established for unicast services. The terminal apparatus uses unified procedures for receiving both unicast and multicast/broadcast data, allowing the NR system to serve multiple service types through a common framework rather than requiring separate specialized mechanisms for each service type.
Solution Approach 2:
The patent applies parameter changes by modifying the reception parameters and configuration settings in the NR system to accommodate multicast/broadcast services. Specifically, the terminal apparatus receives RRC messages that configure MRB parameters, PDCP entity parameters, and reception settings, allowing efficient MBS reception by adjusting these parameters rather than changing the fundamental reception architecture.
2Productivity
If PDCP entities are established for MRBs via RRC messages, then efficient MBS reception is enabled, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing the PDCP entities and configuring all necessary parameters through RRC messages before actual MBS data reception begins. The terminal apparatus receives configuration information in advance, sets up the PDCP entities with appropriate parameters, and prepares the reception infrastructure beforehand, which streamlines the actual data reception process and improves overall efficiency.
Solution Approach 2:
The patent applies self-service by enabling the terminal apparatus to autonomously establish PDCP entities and configure reception parameters based on received RRC messages without requiring complex external coordination. The terminal independently processes the configuration information, sets up its own PDCP entities with appropriate parameters, and manages its reception resources, reducing the need for complex network-side control and simplifying the overall system architecture.
Data Source
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Figure 3(A)~3(B)
AI summary
Provided is a terminal apparatus configured to establish, based on receiving, via a DCCH from the base station apparatus, an RRC message including a part of session information of an MBS session, an MBS radio bearer used to receive the MBS session.