Random Access Resource Selection for Wireless Paging Load
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Solution Overview
Problem
In highly loaded wireless networks, the existing random access procedures in LTE and NR systems face inefficiencies due to the need for large resource reservations for simultaneous random access attempts by multiple UEs, leading to resource wastage and potential long waiting times for UEs with eDRX cycles.
Innovation Solution
A method where wireless devices randomly select a random access resource from a plurality of available resources spread in time, based on the number of devices paged, to distribute the random-access load and reduce peak resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large pool of radio resources is reserved for (N)PRACH to cope with maximum simultaneous random access attempts, then the system can handle peak paging load, but it results in waste of radio resources when actual load is lower
Solution Approach 1:
The patent introduces dynamic random access resource selection where UEs randomly select from multiple available PRACH resources instead of using a fixed allocation. This dynamic approach allows the system to adapt to actual traffic conditions, enabling efficient resource utilization during low load while maintaining sufficient capacity during peak periods through statistical multiplexing
Solution Approach 2:
The system changes the parameter of random access resource allocation from static to dynamic by introducing random selection among multiple resources. This parameter change transforms the resource allocation strategy, allowing the same physical resources to serve varying numbers of UEs based on actual demand, thereby resolving the contradiction between peak capacity and average efficiency
2Reliability
If the eNB distributes paging load by configuring high number of paging occasions per DRX cycle, then paging load per occasion is reduced, but radio resource consumption for paging increases
Solution Approach 1:
The patent combines multiple paging occasions into fewer DRX cycles, reducing the total number of paging transmissions required. By consolidating paging opportunities, the system achieves effective load distribution without proportionally increasing radio resource consumption, as UEs can still access the network through random access when paged
3Loss of energy
If random access resources are reduced to save radio resources, then resource efficiency improves, but waiting time for UEs with eDRX cycles increases
Solution Approach 1:
The patent introduces a time dimension to random access resource allocation by spreading available PRACH resources across multiple time instances. UEs with eDRX cycles can access resources in subsequent time slots if missed in the current occasion, maintaining low waiting times while keeping the total resource pool small. This temporal distribution allows efficient resource reuse without increasing overall consumption
Data Source
AI summary
A method is performed by a wireless device for performing a random access. In response to a received paging transmission, and when certain conditions are met, the wireless device randomly selects a random access resource from a plurality of available random access resources. The available random access resources may be spread in time, or in frequency, or in time and frequency. The wireless device then transmits a random access signal on the selected random access resource.