Uplink Grant Resource Block Assignment Length Adjustment
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Solution Overview
Problem
Current wireless communication systems face challenges in allocating uplink grants in a random access response that are responsive to varying system bandwidths without impacting random access channel procedures for user equipment (UEs).
Innovation Solution
The solution involves encoding a truncated or expanded resource block assignment in the uplink grant based on the uplink bandwidth configuration, allowing the UE to interpret the resource block assignment accurately across different system bandwidths, thereby accommodating variations in system bandwidth without losing information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed-size uplink grant is used in random access response, then the random access procedure is simplified and UE interpretation is straightforward, but the system cannot adapt to different bandwidth configurations
Solution Approach 1:
The patent applies dynamics by making the resource block assignment field length variable rather than fixed. The field length adjusts dynamically based on the system bandwidth configuration, allowing the same RAR message format to work across different bandwidths while maintaining a consistent fixed total message size through compensating adjustments in other fields.
Solution Approach 2:
The patent changes the parameter of field length based on bandwidth configuration. Specifically, the resource block assignment field length varies with system bandwidth, and this parameter change is compensated by adjusting the timing advance field length to maintain overall message structure consistency.
2Adaptability or versatility
If the resource block assignment field length is increased to accommodate larger bandwidths, then more bandwidth configurations can be supported, but the message size exceeds the fixed allocation and disrupts RACH procedures
Solution Approach 1:
The patent uses dynamic field length adjustment where the resource block assignment field expands or contracts based on bandwidth needs, while the timing advance field provides compensating size changes to maintain a constant total message length, avoiding disruption to RACH procedures.
Solution Approach 2:
The patent changes the length parameter of the resource block assignment field according to system bandwidth configuration, and simultaneously adjusts the timing advance field length to compensate, thereby maintaining fixed overall message size while adapting to different bandwidth requirements.
3Device complexity
If the resource block assignment field is truncated to fit fixed message size, then RACH procedures remain intact, but information is lost for larger bandwidth configurations
Solution Approach 1:
The patent prevents information loss by making the resource block assignment field length dynamic rather than fixed. The field expands to accommodate the required number of resource blocks for the given bandwidth configuration, eliminating truncation while maintaining fixed total message size through compensating adjustments in the timing advance field.
Solution Approach 2:
The patent changes the resource block assignment field length parameter based on the number of resource blocks required for the system bandwidth, allowing sufficient information to be conveyed without truncation, while adjusting the timing advance field to maintain overall message size consistency.
Data Source
AI summary
Methods and apparatuses for wireless communication are provided. In an aspect, an uplink grant is received which includes a resource block assignment. The resource block assignment with a length adjustment is interpreted based on an uplink bandwidth configuration. In another aspect, a length adjustment is determined for an uplink grant. The length adjustment is based on an uplink bandwidth configuration. A resource block assignment is encoded based on the length adjustment, and the uplink grant including the resource block assignment is transmitted.