Dedicated H-RNTI Allocation for Reliable MAC Packet Reception
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Solution Overview
Problem
In wireless communications systems, UEs using the common H-RNTI for HS-DSCH reception in CELL_FACH state fail to identify and receive MAC packets due to the absence of UE identity information in MAC-d PDUs, leading to unsuccessful downlink data reception.
Innovation Solution
The method ensures that UEs always use a dedicated H-RNTI for high-speed downlink operations in CELL_FACH state by initiating the RRC establishment procedure with the first function, which allocates a dedicated H-RNTI, preventing the use of the second function that does not allocate a dedicated H-RNTI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE uses common H-RNTI for HS-DSCH reception in CELL_FACH state, then the system can support more UEs in the same cell, but the UE fails to identify and receive MAC packets due to absence of UE identity information
Solution Approach 1:
The patent applies local quality by transitioning from a uniform common H-RNTI assigned to all UEs in a cell to a dedicated H-RNTI assigned to specific UEs based on their individual requirements. This allows different UEs to have different identification characteristics - those needing reliable packet reception receive dedicated H-RNTIs with UE identity information, while others can use common H-RNTI for basic connectivity, thus resolving the contradiction between grouping capability and packet reception reliability.
2Productivity
If the UTRAN does not allocate dedicated H-RNTI during RRC establishment, then the procedure is simpler and faster, but the UE cannot correctly identify and receive downlink data packets
Solution Approach 1:
The patent applies preliminary action by allocating the dedicated H-RNTI during the RRC establishment procedure before the UE needs to receive downlink data. This advance allocation ensures that the UE has the necessary identification information (UE ID and H-RNTI) ready in advance, enabling reliable packet reception without requiring additional setup steps later in the communication process.
3Reliability
If the UE initiates RRC establishment procedure with first function, then a dedicated H-RNTI is allocated enabling successful packet reception, but the establishment procedure becomes more complex
Solution Approach 1:
The patent applies the taking out principle by extracting the H-RNTI allocation function from the general RRC establishment procedure and making it an optional first function that can be selectively activated. This allows the dedicated H-RNTI allocation to be separated as a distinct capability that can be enabled when needed for reliable packet reception, rather than being mandatory for all UEs, thus managing the complexity trade-off.
Data Source
AI summary
A method of improving a high-speed downlink operation in CELL_FACH state for a network terminal of a wireless communications system includes using a first function but not using a second function when a user equipment, hereinafter called UE, initiates a radio resource control establishment procedure. The network terminal wirelessly communicates with the UE, and the network terminal and the UE both support the high-speed downlink operation in CELL_FACH state. The first function is used for allocating a dedicated HS-DSCH radio network transaction identifier (H-RNTI) to the UE, so as to manage the UE to perform the high-speed downlink operation in CELL_FACH based on the dedicated H-RNTI. The second function is used for not allocating the dedicated H-RNTI to the UE.