Dynamic H-ARQ Process Allocation for Wireless Priority Management
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Solution Overview
Problem
In wireless communication systems, the preemption of H-ARQ processes for higher priority data transmissions leads to a loss of combining advantages and inefficient use of radio resources, as lower priority data can monopolize H-ARQ processes, degrading overall system performance and increasing latency.
Innovation Solution
Dynamic allocation of H-ARQ processes in WTRUs for specific transport channels and priority classes, allowing higher priority channels to preempt lower priority channels based on urgency or RNC configuration, and using a common pool of H-ARQ processes to ensure timely initiation of higher priority transmissions without preemption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If H-ARQ processes are preempted for higher priority data transmissions, then higher priority data can be transmitted timely, but the combining advantage is lost and radio resources are used inefficiently
Solution Approach 1:
The patent segments H-ARQ processes into two distinct types: synchronous H-ARQ processes and asynchronous H-ARQ processes. Synchronous processes are used for lower priority data and cannot be preempted, preserving combining benefits. Asynchronous processes are used for higher priority data and can be preempted when necessary. This segmentation allows the system to maintain combining advantages for non-time-critical transmissions while enabling timely delivery for urgent data.
2Productivity
If lower priority data monopolizes H-ARQ processes, then more data can be transmitted, but higher priority transmissions are blocked and system performance degrades
Solution Approach 1:
The patent applies local quality by assigning different preemption characteristics to different H-ARQ processes based on their priority classification. Lower priority H-ARQ processes are configured with non-preemptible characteristics to ensure they can utilize available resources fully, while higher priority H-ARQ processes are configured with preemptible characteristics to ensure they can access resources when needed. This local differentiation of quality attributes resolves the conflict between maximizing throughput and ensuring service quality.
3Productivity
If the number of H-ARQ processes is increased to support multiple simultaneous transmissions, then data rates increase and latency reduces, but memory requirements exceed WTRU capabilities
Solution Approach 1:
The patent implements dynamic allocation of H-ARQ processes where the same physical H-ARQ process can be dynamically assigned to different priority classes based on current transmission needs. When high priority data arrives, the system can allocate asynchronous H-ARQ processes to handle these transmissions. When only low priority data is present, synchronous H-ARQ processes are used. This dynamic assignment allows the limited memory resources to support the functionality of having more simultaneous processes than physically exist.
Data Source
AI summary
A method and apparatus for dynamically allocating hybrid automatic repeat request (H-ARQ) processes in a wireless transmit/receive unit (WTRU) for supporting enhanced uplink (EU) transmissions. The H-ARQ processes in the WTRU are reserved for specific transport channels (TrCHs), dedicated channel medium access control (MAC-d) flows or logical channels associated with different data transmission priority classes. The WTRU allocates H-ARQ processes from those reserved H-ARQ processes that are available. Optionally, a higher priority channel may be allowed to allocate an H-ARQ process reserved for lower priority channels. Lower priority H-ARQ processes may be preempted. The preemption may be restricted by urgency of data transmission, or by radio network controller (RNC) configuration of H-ARQ processes. Alternatively, a common pool of H-ARQ processes may be configured and an H-ARQ process may be allocated from the common pool in accordance with a priority of each channel, and lower priority H-ARQ may be preempted.