Two-Step Random Access MsgB Format for Reduced Latency
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Solution Overview
Problem
The existing four-step random access procedure in LTE and NR systems is cumbersome and leads to longer delays for terminal devices, necessitating a more efficient two-step random access procedure.
Innovation Solution
The proposed solution defines the format of msgB in the two-step random access procedure to include UE contention resolution ID information, dedicated RNTI, uplink timing advance information, or uplink scheduling information, enabling effective response to multiple or single UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-step random access procedure is used, then the random access procedure is complete and reliable, but the procedure is cumbersome and causes longer delay
Solution Approach 1:
The patent merges msg1 and msg3 into a single message A transmitted by the UE, and merges msg2 and msg4 into a single message B transmitted by the network device. This combining of multiple steps into fewer steps directly reduces the access delay while maintaining the essential functions of contention resolution and random access completion.
Solution Approach 2:
The patent segments message B into multiple parts or formats that can handle different scenarios (responding to one UE or multiple UEs). By dividing the response mechanism into different formats within msgB, the system maintains reliability for various random access scenarios while reducing the overall procedure steps.
2Productivity
If msgB responds to multiple UEs, then the response efficiency is improved, but the message format complexity increases
Solution Approach 1:
The patent designs message B with universal formats that can serve multiple purposes: it can respond to a single UE or multiple UEs, and can include different types of information (contention resolution ID, dedicated RNTI, uplink timing advance, uplink scheduling information) based on the scenario. This multi-functionality allows efficient responses without requiring entirely separate message formats for each case.
Solution Approach 2:
The patent employs dynamic message B formats that can be flexibly configured based on the number of UEs and the specific random access scenario. The message structure can adaptively include or exclude certain information elements, allowing efficient responses to multiple UEs when needed while maintaining simpler formats for single-UE scenarios.
3Reliability
If msgB includes all necessary information elements, then the contention resolution is effective, but the message size and processing complexity increase
Solution Approach 1:
The patent applies local quality by including different information elements in message B based on the specific scenario and UE requirements. Not all UEs need all information elements - the message format includes only the necessary components for each particular case, such as including contention resolution ID only when needed, or dedicated RNTI only for specific scenarios.
Solution Approach 2:
The patent uses partial action by including only the necessary subset of information elements in message B for each specific scenario rather than always including all possible elements. This allows effective contention resolution with the minimum required information, reducing message size while maintaining reliability.
Data Source
AI summary
The implementations of the present application provide a random access method and apparatus, a user equipment (UE), and a network device. The method comprises: a UE sends a first message to a network device; the UE receives a second message sent by the network device, the second message being used for responding to the first messages of one or more UEs, and the second message comprising at least one of: UE conflict resolution identification information, a dedicated radio network temporary identifier (RNTI), uplink timing advance information, and uplink scheduling information.