TD-SCDMA Random Access Conflict Resolution via Sub-channel Segmentation
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Solution Overview
Problem
In TD-SCDMA communication systems, user equipment (UE) faces challenges in selecting uplink synchronization codes and time slots during random access, leading to conflicts and failure in synchronization processes, which existing technologies fail to address effectively.
Innovation Solution
The UE physical layer method involves recording available uplink synchronization codes and sub-channels, randomly selecting them to ensure even distribution, and determining the uplink pilot time slot based on system frame numbers to avoid conflicts and meet Quality of Service (QoS) requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE randomly selects uplink synchronization codes and time slots during random access, then the random access process can be initiated, but conflicts occur when multiple UEs select the same resources, causing access failure
Solution Approach 1:
The patent segments the uplink synchronization resources by introducing sub-channel division within the UpPTS time slot. Instead of treating all synchronization codes and time slots as a single resource pool, the system divides them into multiple sub-channels, allowing UEs to select resources from different segments. This segmentation reduces the probability of conflicts by distributing UEs across multiple resource segments.
Solution Approach 2:
The patent implements dynamic resource selection where UEs can adaptively choose from multiple available sub-channels based on current system conditions. The UE physical layer dynamically selects both the uplink synchronization code and the sub-channel index, creating a more flexible and conflict-resistant random access mechanism compared to static resource allocation.
2Adaptability or versatility
If the system configures multiple access service classes with different resources, then QoS requirements can be met, but the device complexity increases due to multiple configuration parameters
Solution Approach 1:
The patent adds a new dimension to resource configuration by introducing sub-channel indexing within the existing UpPTS time slot structure. Instead of only varying the number of time slots or codes, the system creates a hierarchical resource structure where sub-channels are organized within time slots, and synchronization codes are assigned to specific sub-channels. This dimensional organization allows multiple ASCs to share resources more efficiently while maintaining QoS differentiation.
Solution Approach 2:
The patent applies local quality by assigning specific synchronization codes to specific sub-channels for each ASC. Rather than uniformly distributing all codes across all time slots, the system creates localized resource assignments where each ASC has dedicated code-sub-channel pairs. This localized allocation ensures that UEs with different QoS requirements access different resource subsets, reducing inter-ASC interference while maintaining manageable configuration complexity.
Data Source
AI summary
The present invention discloses a random access method for user equipment (UE) in time division synchronization code division multiple access (TD-SCDMA) communication system, including the following steps: (a) the system broadcasts the configured ASC and the configuration information thereof to the UE, the UE records these information; (b) the MAC of the UE sends RACH transmission request to the physical layer, the physical layer selects one RACH; (c) the physical layer of the UE randomly selects an uplink synchronization code and an uplink synchronization sub-channel; (d) after the physical layer of the UE transmits the selected uplink synchronization code in the uplink pilot time slot corresponding to the selected uplink synchronization sub-channel, if the UE receives the access confirmation message from the network, the UE completes the uplink synchronization and selects PRACH to send out the message, otherwise, the access to the network is re-performed. By using this invention, during the random access process of the UE in the TD-SCDMA system, the physical layer of the UE can select the resources configured by the system for the ASC, thereby meeting the QoS requirements and avoiding the generation of conflicts by all means.