Multicast Retransmission Using Segmented Data Versions
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Solution Overview
Problem
In multicast and broadcast wireless communication systems, transmitting devices often use more robust modulation and coding schemes than necessary, leading to unnecessary resource expenditure by receiving devices that could successfully decode data with less robust schemes, and result in redundant bit reception.
Innovation Solution
The method involves encoding multicast and broadcast data bits to generate multiple data versions, which are transmitted in a predefined pattern along with identification and decoding information, allowing receiving devices to selectively retrieve and decode only the necessary versions based on their channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting device uses the most robust modulation and coding scheme to ensure successful transmission to all receiving devices, then the reliability of data transmission is improved, but the resource expenditure by receiving devices increases unnecessarily
Solution Approach 1:
The patent segments the data transmission into multiple versions with different robustness levels. Instead of transmitting a single robust version to all devices, the system creates multiple versions (first version with first robustness level, second version with second robustness level) that can be selectively received based on channel conditions, allowing each receiving device to process only the version it needs.
Solution Approach 2:
The patent applies local quality by tailoring the modulation and coding scheme to the specific channel conditions of each receiving device. Devices with better channel quality receive less robust versions (more efficient decoding), while devices with poorer channel quality receive more robust versions (higher reliability), optimizing resource usage for each local receiver rather than using a uniform approach.
2Reliability
If the transmitting device uses the most robust modulation and coding scheme for point-to-multipoint transmission, then every receiving device has an opportunity to correctly receive the packet data, but receiving devices closer to the transmitting device expend unnecessary resources decoding data transmitted using a more robust MCS
Solution Approach 1:
The patent divides the data transmission into multiple versions with different robustness characteristics. The first version uses a first modulation and coding scheme optimized for certain channel conditions, while the second version uses a second scheme optimized for different conditions. This segmentation allows receiving devices to select only the version appropriate for their channel quality, avoiding unnecessary processing of overly robust versions.
Solution Approach 2:
The patent changes the modulation and coding parameters dynamically based on channel conditions. Instead of using a fixed robust MCS for all devices, the system adjusts the MCS parameters (modulation order, coding rate) according to the specific channel quality of each receiving device, optimizing the balance between transmission reliability and receiver resource consumption.
3Reliability
If the transmitting device transmits multiple redundancy versions of encoded subpackets using incremental redundancy, then the ability to retransmit PDUs is improved, but the complexity of the transmission control mechanism increases
Solution Approach 1:
The patent prepares multiple redundancy versions in advance during the initial encoding process. Instead of generating redundancy versions only when retransmission is needed, the system pre-creates multiple versions of the encoded data with different redundancy levels, so that when channel conditions require retransmission, the appropriate version is already ready for immediate transmission.
Solution Approach 2:
The patent implements feedback mechanisms where receiving devices report their channel conditions and reception status back to the transmitting device. This feedback information enables the transmitter to dynamically select which redundancy version to transmit next, optimizing the retransmission process while managing complexity through intelligent decision-making based on real-time channel knowledge.
Data Source
AI summary
Embodiments of method and apparatus for reception of multicast and broadcast (MBS) transmissions in a wireless communication system including a set of receiving devices is disclosed. A method embodiment includes encoding, by a transmission device, a plurality of MBS data bits to generate a plurality of MBS data versions, and transmitting, to the set of receiving devices, the plurality of MBS data versions, wherein the plurality of MBS data versions are transmitted in a predefined transmission pattern. The method also includes transmitting, to the set of receiving devices, identification and decoding information associated with each of the plurality of MBS data versions.