Wireless Identifier Reuse via Air-Interface Segmentation
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Solution Overview
Problem
In wireless communication systems, contention-based random access protocols can lead to service latency and degradation due to the finite pool of identifiers, especially during handovers, as multiple devices may select the same identifier, causing collisions and reducing the efficiency of contention-free random access requests.
Innovation Solution
The system configures multiple air-interface resources to enable concurrent, non-interfering transmissions of identical random access requests from different wireless communication devices, allowing the reuse of contention-free identifiers and increasing the number of contention-based identifiers available by using different resource blocks within the same uplink subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finite pool of identifiers is used for random access requests, then the system can manage identifier allocation, but service latency increases and contention-free random access efficiency decreases when multiple devices select the same identifier
Solution Approach 1:
The patent introduces a new dimension for identifier reuse by allowing the same identifier to be used across different air-interface resources (time slots, frequency resources). This transforms the problem from a single-dimension identifier collision issue into a multi-dimensional resource allocation problem, enabling identifiers to be reused safely when transmitted on different resources.
Solution Approach 2:
The patent changes the parameter of identifier uniqueness from absolute uniqueness to conditional uniqueness based on air-interface resource separation. By modifying the condition under which identifiers must be unique (only when using the same air-interface resource), the system can reuse identifiers more aggressively, improving random access efficiency and reducing latency.
2Quantity of substance
If multiple devices transmit identical random access requests simultaneously, then the pool of available identifiers for contention-based access increases, but interference between transmissions may occur
Solution Approach 1:
The patent segments the air-interface resources into multiple independent transmission channels (different time slots, frequency resources). This segmentation allows identical identifier transmissions to occur simultaneously on different segments without interference, effectively multiplying the capacity for contention-free random access while preserving identifier pool size for contention-based access.
Solution Approach 2:
The patent enables copying of the same identifier transmission across multiple air-interface resources. Instead of requiring unique identifiers for each device, the system allows identical identifier copies to be transmitted simultaneously on different resources, increasing the effective capacity for contention-free access without depleting the identifier pool.
Data Source
AI summary
A system and method for reuse of identifiers for contention-free random access requests by wireless communication devices (WCDs) to a network are disclosed. A base station can configure two or more air-interface resources for concurrent, non-interfering transmissions by two or more different WCDs of identical random access requests to the base station. The base station may then assign an identical identifier for contention-free random access requests to two or more WCDs, while assigning the WCDs different ones of the two or more air-interface resources configured for the concurrent, non-interfering transmissions. The two or more WCDs can then concurrently transmit identical contention-free random access requests that do not interfere with one another. By way of example, the air-interface resources can be different instances of a physical random access channel, each instance corresponding to a different resource block of a common uplink subframe in a long-term evolution (LTE) system.