Hybrid Group Hopping for Collision-Free Wireless Data Transmission
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to the overhead required for control information in data transmission, which reduces system capacity and leads to collisions in packet retransmissions.
Innovation Solution
Implementing a hybrid scheme that combines group hopping for new packet transmissions and static grouping for retransmissions, allowing UEs to be preconfigured with modulation and coding schemes and resource blocks, enabling blind decoding without control information, and using semi-static group assignment to adapt resource allocation based on loading and data requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is sent with each data transmission, then the UE can reliably receive and decode packets, but system resources are consumed and system capacity is reduced
Solution Approach 1:
The patent extracts and removes the control information from each data transmission. The base station sends data packets directly to the UE without accompanying control information, forcing the UE to perform blind decoding. This eliminates the overhead of control channels while maintaining reliable communication through the blind decoding mechanism that checks multiple hypotheses about packet presence and validity.
Solution Approach 2:
The UE is empowered to self-determine whether packets are being sent to it by performing blind decoding on received signals. Instead of relying on base station control information, the UE independently evaluates multiple hypotheses about packet presence, modulation schemes, and resource allocations, thereby serving its own need for reliable packet detection without external control overhead.
2Productivity
If pseudo-random group hopping is used for resource block assignment, then statistical multiplexing gain is improved, but packet retransmission collisions occur
Solution Approach 1:
The patent segments the resource allocation into two distinct parts: initial resource blocks assigned via pseudo-random group hopping for new packet transmissions, and dedicated retransmission resource blocks specifically reserved for HARQ retransmissions. This segmentation prevents collisions by ensuring that retransmissions occur on guaranteed available resources separate from the dynamically hopping initial allocations.
Solution Approach 2:
The patent performs preliminary action by pre-allocating specific resource blocks for retransmissions before actual data transmission occurs. The base station reserves these retransmission resources in advance based on the pseudo-randomly determined initial resource blocks, ensuring that when retransmissions are needed, collision-free resources are already prepared and available.
3Productivity
If blind decoding is performed without control information, then control overhead is reduced, but decoding complexity increases
Solution Approach 1:
The patent applies partial action by having the UE perform blind decoding only on a limited set of pre-configured hypotheses rather than exhaustively searching all possible transmission parameters. The UE checks specific hypotheses about packet presence, modulation schemes, and resource allocations that are constrained by the pre-shared configuration between base station and UE, reducing the overall decoding complexity while maintaining the benefits of control-information-free operation.
Data Source
AI summary
Techniques for supporting data transmission with little or no control overhead are described. In an aspect, data may be sent based on a hybrid scheme that utilizes a combination of group hopping for transmissions of new packets and static grouping for retransmissions of pending packets. For the hybrid scheme, a user equipment (UE) may be assigned different resource blocks in different transmission intervals based on a hopping pattern. The first transmission of new packets may be sent on resource blocks determined based on the hopping pattern. Retransmissions of each packet, if any, may be sent on the resource block used for the first transmission of the packet. The UE may perform blind decoding to recover packets sent to the UE. In another aspect, semi-static group assignment may be used, and the UE may be assigned a group of resource blocks that may change periodically or based on trigger events.