BL/CE Terminal Multicast Search Space Configuration
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Solution Overview
Problem
Current 3GPP Release-13 Bandwidth Reduced Low complexity/Coverage Enhancement (BL/CE) terminals and Narrowband Internet of Things (NB-IoT) terminals lack support for multicast transmission, specifically multicasting data channel transmission, which is not defined in the existing standards.
Innovation Solution
Configuring a separate downlink control channel search space, such as the MPDCCH or NPDCCH search space, to enable the BL/CE and NB-IoT terminals to receive and transmit multicasting data channels by transmitting scheduling control information through these specifically configured search spaces based on configuration information received from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast transmission functions are provided to typical LTE terminals, then multicast service capability is improved, but device complexity increases for BL/CE and NB-IoT terminals
Solution Approach 1:
The patent segments the downlink control channel search space into multiple distinct search spaces: common search space for system information, dedicated search space for unicast data, and multicast search space for multicast data. This segmentation allows BL/CE and NB-IoT terminals to selectively monitor only the multicast search space when multicast services are needed, avoiding the complexity of processing all control channels while maintaining multicast capability.
2Adaptability or versatility
If separate MPDCCH search space is configured for multicast data channel, then multicast transmission support is improved, but control channel configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring distinct search spaces for different service types before actual data transmission begins. The base station configures the multicast search space parameters (such as monitoring occasions, frequency locations, and resource allocations) in advance through system information or RRC signaling, so that terminals can immediately receive multicast data without dynamic configuration complexity during operation.
3Adaptability or versatility
If multicast data channel transmission is enabled for BL/CE terminals, then service functionality is improved, but processing overhead increases
Solution Approach 1:
The patent applies local quality by optimizing the multicast search space configuration specifically for BL/CE and NB-IoT terminal characteristics. The search space is designed with localized monitoring occasions and resource allocations that match the reduced capabilities of these terminals, allowing them to receive multicast data with minimal processing overhead while maintaining their low-complexity design philosophy.
Data Source
AI summary
The present disclosure proposes a method of supporting Single Cell Point-to-Multi-point (SC-PTM) for a Bandwidth reduced Low complexity/Coverage Enhancement (BL/CE) terminal or an NB-IoT terminal, which are for a Machine Type Communication (MTC) application defined in a 3GPP LTE/LTE-A system. Particularly, the present disclosure proposes a method of allocating a resource of a PDSCH for transmitting an SC-MTCH that is multicasting data information for a single cell group terminal.