Random Access Scrambling Sequence for Uplink Data Transmission
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Solution Overview
Problem
The current random access procedure in communication systems is delayed due to the need for a Temporary Cell Radio Network Temporary Identifier (TC-RNTI) assignment before uplink transmission, which hinders swift establishment of uplink synchronization.
Innovation Solution
A method that determines a scrambling sequence based on a random access preamble index and/or synchronization signal block index, allowing for scrambling or descrambling of data channels in the random access procedure, thereby enabling the inclusion of uplink data in the first message, reducing the delay by eliminating the need for separate TC-RNTI allocation and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current random access procedure is used where UE needs to obtain TC-RNTI before sending data channel, then the procedure follows standard protocol steps, but the random access delay is increased
Solution Approach 1:
The patent applies preliminary action by performing scrambling sequence generation and data channel scrambling using the preamble index before the TC-RNTI is obtained. The UE prepares the scrambled data channel in advance based on available information (preamble index), so that when the random access response is received, the data channel can be transmitted immediately without waiting for TC-RNTI assignment, thus reducing random access delay while maintaining protocol compliance
Solution Approach 2:
The patent uses the preamble index as an intermediary to generate the scrambling sequence. Instead of directly using TC-RNTI (which is not yet available), the system employs the preamble index as a temporary mediator to create the necessary scrambling sequence for data channel transmission. This intermediary approach allows the procedure to continue without interruption until TC-RNTI is received
2Reliability
If the UE waits for TC-RNTI assignment before transmitting data channel, then proper identifier assignment is ensured, but the synchronization establishment is delayed
Solution Approach 1:
The patent performs preliminary scrambling sequence generation using the preamble index before the TC-RNTI is assigned. This allows the UE to prepare the data channel for transmission in advance, reducing the waiting time between achieving downlink synchronization and being able to transmit uplink data, thereby improving synchronization speed while ensuring proper identifier assignment occurs when TC-RNTI is received
3Reliability
If separate TC-RNTI allocation and processing steps are performed, then proper resource management is maintained, but the overall procedure complexity increases
Solution Approach 1:
The patent merges the scrambling sequence generation with the existing random access preamble transmission process. By generating the scrambling sequence based on the preamble index at the same time as the preamble is prepared and transmitted, the system combines multiple operations into a unified process, reducing procedural complexity while maintaining proper resource management through subsequent TC-RNTI assignment
Data Source
AI summary
Disclosed are a random access method and a communication device. The method includes determining a first scrambling sequence according to at least one of a first random access preamble index or a first synchronization signal block index. The method also includes performing a first scrambling or descrambling process on a data channel in a first message in a random access procedure according to the first scrambling sequence. The first scrambling or descrambling process includes scrambling or descrambling performed on an encoded information bit on the data channel.