DCI Transmission via RNTI Differentiation for MBMS Overhead Reduction
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Solution Overview
Problem
Existing methods for transmitting downlink control information (DCI) in MBMS systems require additional bits to indicate changes in multicast traffic channel configurations and new services, leading to increased bit overhead and reduced control channel transmission performance.
Innovation Solution
The method involves using different radio network temporary identifiers (RNTIs) to indicate whether the DCI schedules a multicast traffic channel or a user equipment-specific channel, allowing the necessary information to be transmitted without adding extra bits by selectively including or excluding specific information fields in the DCI format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 2 bits are added to DCI to indicate MTCH configuration changes and new service start, then the indication capability is improved, but the bit overhead increases and control channel transmission performance deteriorates
Solution Approach 1:
The patent extracts the indication function from a dedicated bit field and implements it through RNTI-based differentiation. Instead of adding bits to DCI, the system extracts the need for explicit indication bits and replaces them with implicit indication through RNTI selection, thereby reducing bit overhead while maintaining indication capability
Solution Approach 2:
The RNTI field, which traditionally serves only for identification purposes, is given multi-functionality by using different RNTIs to simultaneously indicate both the target channel type (MTCH vs UE-specific) and the presence of configuration change information. This universal approach eliminates the need for separate indication bits
2Adaptability or versatility
If 2 bits are added to DCI to indicate MTCH configuration changes and new service start, then the indication capability is improved, but the control channel transmission performance deteriorates
Solution Approach 1:
The patent removes unnecessary indication bits from the DCI structure, extracting only the essential scheduling information. By using RNTI-based differentiation, the system extracts the indication function from the data plane and moves it to the control plane through identifier selection, thereby improving transmission efficiency and reliability
Solution Approach 2:
Instead of adding information to DCI to improve indication capability, the patent inverts the approach by using information removal (not including certain fields in DCI) combined with RNTI-based implicit indication. This inversion reduces DCI overhead and improves control channel transmission performance while maintaining full indication capability
Data Source
AI summary
Embodiments of the present invention disclose a downlink control information (DCI) transmission method, a network device, and user equipment. The method includes the following steps: A network device transmits DCI in a first DCI format; when the DCI is used to schedule a physical downlink shared channel (PDSCH) carrying a multicast traffic channel, the network device indicates, by using a first radio network temporary identifier (RNTI), that the DCI is used to schedule the PDSCH carrying the multicast traffic channel, and that first information is indicated in the DCI and second information is not indicated in the DCI; and when the DCI is used to schedule a user equipment-specific (UE-specific) PDSCH, the network device indicates, by using a second RNTI, that the DCI is used to schedule the UE-specific PDSCH, and that the first information is not indicated in the DCI and the second information is indicated in the DCI.