Retransmission Control With CoMP Suspension For Backhaul Capacity
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Solution Overview
Problem
The existing communication systems with multiple reception points face challenges in managing retransmissions due to strict capacity and latency requirements in backhaul connections, especially when high-rate connections like optical fibers are not economically feasible, leading to delayed information availability and unnecessary system loading.
Innovation Solution
The proposed solution dynamically selects the use of CoMP reception and HARQ retransmission methods based on predefined criteria, such as decoding gains and backhaul link capacity, to suspend or adjust retransmissions, allowing for more efficient use of multipoint reception and reducing unnecessary retransmissions and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP reception is used with multiple reception points, then system throughput and coverage are improved, but backhaul capacity requirements and latency constraints increase
Solution Approach 1:
The patent segments the retransmission process by introducing a suspension mechanism that divides the traditional HARQ retransmission flow into distinct phases: initial transmission, optional suspension period, and deferred retransmission. This segmentation allows the system to evaluate whether CoMP reception is needed before committing to retransmission, thereby reducing unnecessary backhaul traffic while maintaining throughput for cases where CoMP is beneficial.
Solution Approach 2:
The patent applies preliminary action by suspending retransmission before it occurs when there is an indication that CoMP reception may be beneficial. The system proactively pauses the retransmission process, allowing time for CoMP processing to occur without the pressure of immediate retransmission deadlines, thus reducing backhaul capacity requirements while preparing for potential throughput improvement.
2Reliability
If retransmission is performed according to fixed HARQ timing, then reliability is maintained, but latency increases and system efficiency decreases
Solution Approach 1:
The patent introduces dynamics into the previously fixed HARQ timing by making retransmission timing flexible. The system can now dynamically suspend retransmission based on indicators about CoMP reception status, allowing the timing to adapt to actual system conditions rather than following a rigid schedule, thereby reducing latency while maintaining reliability through conditional retransmission.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors indicators related to CoMP reception and uses this feedback to决定是否 suspend retransmission. This feedback loop allows the system to adjust retransmission timing based on real-time conditions, reducing unnecessary latency while maintaining reliability by only suspending when CoMP is likely to provide benefit.
3Reliability
If parallel retransmissions are performed across multiple reception points, then decoding reliability is improved, but system loading and resource consumption increase
Solution Approach 1:
The patent applies local quality by making retransmission behavior location-specific and condition-specific. Instead of uniformly performing parallel retransmissions across all reception points, the system selectively suspends retransmission at specific reception points based on local indicators about CoMP reception status. This localized approach reduces overall system loading while maintaining decoding reliability where CoMP is actually beneficial.
Solution Approach 2:
The patent uses partial action by implementing optional suspension of retransmission rather than always performing full parallel retransmissions. The system applies suspension selectively based on indicators, performing the action (suspending retransmission) only partially and only when conditions suggest CoMP will be beneficial, thereby reducing system loading while maintaining sufficient reliability.
Data Source
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AI summary
A method and apparatus for controlling retransmissions in multipoint reception is disclosed. In the method it is determined that additional information is needed for decoding of at least one received information block. A procedure is selected for obtaining the additional information from a plurality of options to proceed based on information about predicted result of at least one of the options. In accordance with an aspect an indication of one of a positive acknowledgement of the information block, a negative acknowledgement of the information block and suspension of retransmission of the information block is generated and communicated on a retransmission control channel.