Wireless Communication Node Random Access Resource Allocation
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Solution Overview
Problem
In wireless communication systems, reducing the allocation of cell-common RA resources to save energy can lead to increased access latency for legacy User Equipment, and existing solutions fail to balance energy savings with latency and hardware complexity effectively.
Innovation Solution
A method and device for wireless communications that dynamically allocate random access resources by setting thresholds for reception quality, allowing the system to preferentially occupy alternative resource sets, thereby reducing congestion in primary resource sets while maintaining transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the allocation of cell-common RA resources is reduced to save energy, then energy consumption is reduced, but access latency for legacy UE increases
Solution Approach 1:
The patent segments RA resources into two distinct sets: a first RA resource set with relatively sparse resources for energy saving, and a second RA resource set with sufficient resources for low latency. This segmentation allows the system to provide different resource allocations for different UE types, resolving the contradiction between energy saving and access latency for legacy UE.
Solution Approach 2:
The patent applies local quality by making the RA resource allocation UE-type-specific. Legacy UE are directed to the second RA resource set with sufficient resources to maintain low access latency, while other UE types can utilize the first RA resource set for energy saving. This localized optimization resolves the contradiction by providing different resource qualities to different user groups.
2Use of energy by moving object
If the allocation of cell-common RA resources is reduced to save energy, then energy consumption is reduced, but hardware complexity increases
Solution Approach 1:
The patent extracts the complexity from hardware by implementing a lightweight indication mechanism. The base station uses simple signaling (e.g., a flag in system information or a dedicated indication message) to tell UE which RA resource set to use, avoiding the need for complex hardware-based resource management and resolution of the contradiction between energy saving and hardware complexity.
Solution Approach 2:
The patent makes the indication mechanism universal and configurable, allowing it to adapt to different deployment scenarios and UE types through software configuration rather than hardware redesign. This multi-functionality enables the same indication mechanism to serve various purposes (energy saving, latency optimization, load balancing) without increasing hardware complexity.
3Loss of time
If alternative RA resource sets are introduced to maintain access latency, then access latency is maintained, but system complexity increases
Solution Approach 1:
The patent extracts the complexity of managing multiple RA resource sets by using a simple indication mechanism that tells UE which set to use. This approach maintains low access latency for legacy UE through the second resource set while avoiding the need for complex system-wide coordination and management of multiple resource sets, thus resolving the contradiction between access latency and system complexity.
Solution Approach 2:
Instead of having UE complexly select from multiple RA resource sets based on various criteria, the patent inverts the approach by having the network explicitly indicate which resource set UE should use. This simplifies the system complexity while maintaining the ability to provide low-latency access to legacy UE through the second resource set.
Data Source
AI summary
The present application provides a method and a device in a communication node for wireless communications. A communication node receives first information, second information and a first signaling, herein, only a former of the first information and the second information belongs to legacy SIB1; transmits a first message on a first radio resource, the first message comprises a random access preamble, the first radio resource belongs to a first resource set or the first radio resource belongs to a second resource set; herein, the first resource set depends on an indication of the legacy SIB1, and the first signaling is used to determine the second resource set. The scheme in the present application can reduce the random access delay of a legacy UE.