HARQ Control Signaling for Wireless Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in managing signaling overhead and resource allocation efficiency, particularly in HARQ processes, leading to increased complexity and potential packet loss due to irregular resource vacancies and missed control signaling.
Innovation Solution
A method is introduced that involves transmitting control information from a base station to a mobile station, including an encoder packet ID, resource ID, and other relevant parameters like MCS and MIMO mode, to uniquely identify the HARQ process and allocate resources efficiently, with options for scrambling using a user ID and dynamic retransmission scheduling based on ACK/NAK/NULL responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fully asynchronous unicast HARQ is used with independent resource allocation for each transmission, then adaptability to real-time channel conditions is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the resource allocation into two parts: semi-persistent allocation for initial transmission and dynamic allocation for retransmissions. This segmentation allows the system to maintain adaptability for retransmissions while reducing signaling overhead for initial transmissions by using pre-configured resources.
Solution Approach 2:
The patent implements preliminary resource allocation through semi-persistent scheduling where resources are pre-configured for initial transmissions. This preliminary action reduces the need for extensive signaling overhead during actual transmissions, as the basic resource framework is established in advance.
2Loss of information
If fully synchronous unicast HARQ is used with fixed resource allocation, then signaling overhead for retransmission is reduced, but scheduling complexity and signaling overhead for first transmission increase
Solution Approach 1:
The patent introduces dynamic retransmission scheduling that allows flexible resource allocation for retransmissions based on actual channel conditions and system load. This dynamic approach reduces scheduling complexity by allowing the base station to optimize retransmission resources without rigid constraints, while maintaining low signaling overhead.
Solution Approach 2:
The patent changes the resource allocation parameters from fixed (synchronous) to semi-flexible by allowing dynamic retransmission scheduling. This parameter change enables the system to maintain low signaling overhead while reducing scheduling complexity through adaptive resource selection based on current system state.
3Reliability
If multicast HARQ is used with worst channel quality indicators, then coverage for multiple users is improved, but retransmission efficiency decreases when some users successfully decode
Solution Approach 1:
The patent implements feedback mechanisms where user equipment sends acknowledgment information to the base station. This feedback allows the base station to identify which users successfully decoded the transmission and which require retransmission, enabling targeted retransmissions that improve efficiency while maintaining coverage for all users.
Solution Approach 2:
The patent applies local quality differentiation by providing different service levels to different users based on their individual channel conditions and decoding success. Users with good channel conditions receive efficient single-shot transmissions, while users with poor conditions receive targeted retransmissions, optimizing both coverage and efficiency.
Data Source
AI summary
Methods described herein are for wireless communication systems. One aspect of the invention is directed to a method for a HARQ process, in which the HARQ process includes a first transmission of an encoder packet and at least one retransmission. The method involves allocating a transmission resource for each respective transmission. The method involves transmitting control information from a base station to a mobile station for each respective transmission. The control information includes information to uniquely identify the HARQ process and an identification of one of a time resource, a frequency resource and a time and frequency resource that is allocated for the transmission. In some embodiments of the invention, specific control information is signalled from a base station to a mobile station to enable RAS-HARQ operation. In some embodiments of the invention, retransmission signaling in included as part of regular unicast signaling used for both first transmission and retransmissions. In some embodiments of the invention, a 3-state acknowledgement channel and associated error recovery operation enables the base station and mobile station to recover from control signaling error and reduce packet loss.