SC-PTM Base Station Logical Channel Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Multimedia Broadcast Multicast Service (MBMS) systems in mobile communication lack clarity on the logical channel used for transmitting Single Cell Point to Multi-point (SC-PTM) configuration information and unclear application of Hybrid ARQ (HARQ) in SC-PTM transmission.
Innovation Solution
The implementation of a base station and user terminal configured to provide SC-PTM transmission using a Group Control Channel (GCCH) mapped on the Downlink Shared Channel (DL-SCH), with specific RNTIs for resource allocation information, and the application of HARQ with different RNTIs for first and retransmission transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SC-PTM configuration information is transmitted via an undefined logical channel, then the system maintains flexibility, but the transmission clarity and reliability deteriorate
Solution Approach 1:
The patent segments the control information transmission by defining a specific logical channel (SC-PTM control channel) separate from the traffic channel, while both are mapped on the DL-SCH. This segmentation provides clear identification and reliable transmission of configuration information without compromising system flexibility.
Solution Approach 2:
The patent introduces a predetermined RNTI as an intermediary identifier for the SC-PTM control channel. This RNTI acts as a mediator that enables clear identification and reliable reception of configuration information by user terminals, resolving the contradiction between flexibility and transmission clarity.
2Device complexity
If a single RNTI is used for both configuration information and multicast data transmission, then the system complexity is reduced, but the resource allocation precision deteriorates
Solution Approach 1:
The patent segments the RNTI usage by assigning a predetermined RNTI specifically for SC-PTM control channel (configuration information) and a G-RNTI for multicast data transmission. This segmentation enables precise resource allocation and identification without significantly increasing system complexity, as both RNTIs operate within the existing LTE framework.
3Device complexity
If HARQ is not clearly applied in SC-PTM transmission, then the system maintains simplicity, but the transmission reliability deteriorates
Solution Approach 1:
The patent implements HARQ feedback mechanism for SC-PTM transmission by using a predetermined RNTI for initial transmission and a G-RNTI for retransmission. This feedback mechanism improves transmission reliability while maintaining relative system simplicity by leveraging the existing HARQ infrastructure in LTE.
Data Source
AI summary
A base station includes a controller that performs multicast service SC-PTM transmission, and a transmitter that transmits SC-PTM configuration information related to a configuration of the SC-PTM transmission via a SC-PTM control channel, which is a logical channel different from a MCCH, and transmits multicast data via a traffic channel for the SC-PTM transmission. Each of the SC-PTM control channel and the traffic channel is mapped on a DL-SCH. The transmitter transmits a SIB related to the SC-PTM control channel via a BCCH, transmits first resource allocation information for transmitting the SC-PTM configuration information via a PDCCH, where a predetermined RNTI for the SC-PTM control channel is applied to transmission of the first resource allocation information, and transmits second resource allocation information for transmitting multicast data by the SC-PTM transmission via the PDCCH. A G-RNTI different from the predetermined RNTI is applied to transmission of the second resource allocation information.