Random Access Contention Resolution With Combined Uplink Grant
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in contention resolution during random access procedures, particularly for terminal devices out of synchronization with the network, leading to unnecessary resource allocation and wasted capacity in downlink control information.
Innovation Solution
A method where a terminal device transmits a random access request with its identification, such as C-RNTI, and receives a response from the network device containing a corresponding identification and resource information, allowing concurrent determination of contention resolution and resource allocation without separate downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate downlink control information is used for contention resolution and resource allocation, then reliability of random access procedure is improved, but device complexity and control information overhead increase
Solution Approach 1:
The patent combines contention resolution and resource allocation into a single uplink grant message transmitted by the network device. Instead of using separate downlink control information for contention resolution indication and resource allocation, the invention merges these functions into one unified message that simultaneously provides both the contention resolution result and the resource allocation for subsequent uplink transmission, thereby reducing control information overhead while maintaining procedural reliability
Solution Approach 2:
The uplink grant message is designed to serve multiple functions: it acts as both a contention resolution indication and a resource allocation grant. This multi-functional message structure allows the network device to convey both the result of contention resolution and the resource assignment for uplink data transmission in a single control information element, improving efficiency and reducing overhead
2Measurement precision
If separate downlink control information is transmitted for contention resolution indication, then measurement precision of contention resolution is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent merges the contention resolution indication and resource allocation into a single uplink grant message, allowing the terminal device to determine both the contention resolution result and receive resource allocation simultaneously. This eliminates the sequential processing time required for separate messages, reducing the overall time for the random access procedure while maintaining precise contention resolution through the unified message structure
Data Source
AI summary
Embodiments of the present disclosure relate to contention resolution in random access procedure. A first device transmits to a second device a random access request comprising a first identification of the first device. The first device receives a response to the random access request from the second device. The response comprises a second identification from the second device for the first device and control information indicating a resource for communication between the first device and the second device. The first device compares the second identification with the first identification to determine data to be transmitted by using the indicated resource.