PDCCH Control Message Transmission Reliability
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Solution Overview
Problem
The performance of radio telecommunications networks is limited by the Physical Downlink Control Channel (PDCCH) due to its limited code rate and minimum Signal to Interference and Noise Ratio (SINR) requirements, which restricts coverage and capacity, leading to potential transmission failures and delayed retransmissions.
Innovation Solution
The method involves transmitting control messages multiple times within a single transmission time interval across multiple control channel element groups, allowing for independent decoding and increasing the probability of successful transmission, thereby reducing the minimum SINR required for successful communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control messages are transmitted using PDCCH with QPSK modulation and limited CCEs, then the code rate is limited from below and minimum SINR is required, but coverage and capacity are restricted
Solution Approach 1:
The control message is segmented into multiple parts and transmitted through multiple PDCCH transmissions within the same subframe. Each transmission uses a different set of CCEs, dividing the transmission task into multiple independent segments that can be received and decoded separately by the UE.
Solution Approach 2:
The control message is transmitted periodically multiple times within the same subframe at different time instances. This periodic transmission within a single subframe increases the probability that at least one transmission will be successfully received, effectively combating fading and interference without requiring additional subframes.
2Device complexity
If control messages are transmitted using PDCCH with limited CCEs, then transmission structure is simplified, but transmission failures occur and retransmissions are delayed
Solution Approach 1:
Multiple PDCCH transmissions carrying the same control message are merged into a single subframe. This combining approach allows the UE to attempt decoding of multiple transmissions and select the successful one, improving reliability while maintaining the simplicity of the existing PDCCH structure without requiring complex new protocols.
3Ease of manufacture
If control messages are transmitted using PDCCH with QPSK modulation, then modulation scheme is simple, but code rate is limited and minimum SINR is required
Solution Approach 1:
The control message transmission is made continuous through multiple transmissions within the same subframe. Instead of a single discrete transmission that may fail, the message is transmitted continuously across multiple opportunities, ensuring that the useful action of control information delivery is maintained even in poor channel conditions.
Data Source
AI summary
Embodiments disclose a method in a first communication device in a radio telecommunications network for transmitting a control message comprising communication configuration information to a second communication device within the radio telecommunications network. The first communication device determines the communication configuration information of the control message and maps the control message to a plurality of control channel element groups for the second communication device. The first communication device then transmits the control message to the second communication device over the plurality of control channel element groups within a single transmission time interval on a radio control channel.