Wireless Node DCI Interpretation for Cross-Cell Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining whether a cell associated with a Preamble comprises the cell identified by a C-RNTI, particularly in scenarios involving DCI enhancements for mobility, leading to inefficiencies in air interface resource allocation and random access success.
Innovation Solution
A method is introduced to interpret DCI bit blocks based on whether the cell associated with the Preamble includes the cell, using additional bit blocks and RRC messages to configure Preamble and reference signal resources, thereby determining the air interface resource and improving random access success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the DCI format is enhanced to support mobility scenarios where the cell associated with the Preamble does not comprise the cell identified by C-RNTI, then the adaptability for different mobility scenarios is improved, but the device complexity and protocol complexity increase
Solution Approach 1:
The patent applies dynamics by making the interpretation of the first bit block conditional based on the cell association status. The bit block dynamically changes its meaning: when the cell associated with the Preamble comprises the cell identified by C-RNTI, it indicates air interface resources; when it does not comprise the cell, it indicates a cell index. This dynamic interpretation mechanism enables the system to handle different mobility scenarios without requiring separate DCI formats, thus improving adaptability while controlling complexity.
Solution Approach 2:
The patent changes the parameter interpretation based on the cell association condition. The same bit block parameter serves different functions depending on whether the Preamble's associated cell comprises the C-RNTI cell. This parameter change approach allows a single DCI format to support multiple scenarios, improving versatility without proportionally increasing device complexity.
2Loss of information
If additional bit blocks are added to DCI to indicate cell information for Preambles associated with different cells, then the information completeness is improved, but the DCI field occupation increases
Solution Approach 1:
The patent makes the first bit block universal by enabling it to serve multiple functions depending on the cell association context. When the Preamble is associated with the C-RNTI cell, the bit block indicates air interface resources; when associated with a different cell, it indicates the cell index. This multi-functionality eliminates the need for separate bit blocks for cell indication, maintaining information completeness while avoiding additional DCI field occupation.
Solution Approach 2:
The existing first bit block in the DCI format performs self-service by adapting its function based on the cell association status. Instead of requiring additional dedicated bit blocks for cell information, the existing bit block reuses itself to convey different types of information, thereby maintaining information completeness without increasing DCI field occupation.
3Reliability
If the DCI format is enhanced to support cross-cell Preamble scenarios, then the reliability of random access is improved, but the ease of operation and implementation becomes more difficult
Solution Approach 1:
The patent uses dynamic interpretation of the first bit block based on cell association to improve random access reliability. The UE determines whether to interpret the bit block as air interface resource indication or cell index based on whether the Preamble is associated with the C-RNTI cell. This dynamic mechanism enables reliable cross-cell random access while keeping the operation straightforward through clear conditional logic.
Data Source
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AI summary
Disclosed in the present application are a method and apparatus used in a communication node for wireless communication. The method comprises: a communication node receiving first signaling and receiving first DCI, wherein the first DCI is identified by a C-RNTI of a first node in a first cell, the first DCI comprises a first bit block and a second bit block, the first bit block comprises at least one bit, the second bit block comprises at least one bit, and any bit comprised in the second bit block does not belong to the first bit block; and in response to the reception of the first DCI, sending a first preamble on a first air interface resource, wherein the first signaling is used for determining whether the second bit block indicates a cell associated with the first preamble, the interpretation of the first bit block depends on whether the cell associated with the first preamble comprises the first cell, and when the cell associated with the first preamble comprises the first cell, the first bit block is used for determining the first air interface resource. The solution provided in the present application reduces the occupation of a DCI reserved field.