RAN Parallel Resource Allocation for Instant Session Latency
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Solution Overview
Problem
Traditional instant communication services over packet-switched networks face high latency due to the separation of paging and resource allocation processes, exacerbated by dormancy periods in wireless communication devices, which hinder rapid session establishment.
Innovation Solution
The radio access network (RAN) overlaps the latency associated with paging and resource allocation by pre-allocating resources upon identifying an instant communication session setup message with a suitable QoS indication, allowing for reduced overall session establishment latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional sequential paging and resource allocation is used, then device compatibility and network stability are maintained, but session establishment latency increases
Solution Approach 1:
The RAN pre-allocates resources for the destination WCD before the WCD responds to the page request. This preliminary resource allocation occurs in parallel with the paging process, eliminating the sequential wait time and reducing overall session establishment latency while maintaining procedural simplicity
Solution Approach 2:
The patent combines the paging process and resource allocation process into a single parallel operation. Instead of completing paging first then allocating resources, both operations proceed simultaneously, merging their execution timelines to reduce total latency without increasing procedural complexity
2Loss of time
If resources are pre-allocated for all incoming packets, then session establishment latency is reduced, but network resource waste increases
Solution Approach 1:
The RAN applies different handling strategies based on the specific characteristics of each incoming packet. For instant communication session setup messages, parallel pre-allocation is applied to reduce latency. For other packet types, traditional sequential processing is maintained to avoid unnecessary resource consumption, thus applying quality locally rather than uniformly across all packets
Solution Approach 2:
The system changes the processing parameter based on packet type identification. When an instant communication session setup message is detected, the system switches to parallel processing mode with pre-allocation. For other packets, it maintains standard sequential processing, thereby optimizing latency only where necessary without wasting resources on unrelated traffic
3Use of energy by moving object
If dormant devices are woken up using traditional paging, then power consumption is minimized during dormancy, but session establishment latency increases
Solution Approach 1:
While the destination WCD is still in dormant state and processing the page request, the RAN performs preliminary resource allocation in parallel. This allows the WCD to maintain low power consumption during dormancy while the network prepares resources in advance, so that when the WCD wakes up, resources are already ready, reducing the effective latency without increasing device power consumption
Data Source
AI summary
Methods and systems for reducing the latency of instant communication session establishment are presented. According to various preferred embodiments, a RAN, may receive a setup request message via a packet-switched network. The RAN may determine, from a quality of service (QOS) indication contained in the setup request message, that the setup request message is requesting establishment of a instant communication session. The RAN may further determine an intended destination wireless communication device (WCD) for the setup request message. Based on the QOS indication and/or a profile indicating the destination WCD's capabilities, the RAN may pre-allocate resources for the instant communication session in parallel to paging the destination WCD. In this way, the latencies associated with these procedures are overlapped, thus reducing the overall latency of instant communication session establishment.