UE Early Capability Indication for RedCap Msg3 Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently identifying and accommodating reduced capability User Equipments (RedCap UEs) and their coverage enhancement needs during initial access, leading to suboptimal resource allocation and communication efficiency.
Innovation Solution
User Equipments (UEs) employ implicit and explicit signaling methods to indicate their RedCap capability and Msg3 repetition requirements using distinct RACH resource sets or additional uplink transmissions, allowing network nodes to efficiently allocate resources based on these capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs use generic initial access procedures without capability indication, then the access procedure is simple, but resource allocation is inefficient and coverage enhancement needs are not met
Solution Approach 1:
The UE indicates its capability characteristics (RedCap status, Msg3 repetition capability) during the initial access procedure before actual data transmission begins. This preliminary indication allows the gNB to prepare and allocate appropriate resources in advance, avoiding the need for complex capability exchange procedures later in the connection establishment process.
Solution Approach 2:
The capability indication is segmented into specific characteristics that can be independently signaled: RedCap UE status and Msg3 repetition capability. This segmentation allows the network to selectively apply different resource allocation strategies based on the specific capability组合, rather than requiring a complete capability description, thus balancing efficiency and complexity.
2Reliability
If UEs transmit Msg3 without repetition for all cases, then the transmission is fast, but coverage is insufficient for cell-edge users
Solution Approach 1:
The system dynamically adapts the Msg3 transmission strategy based on UE capability indication. UEs that indicate support for Msg3 repetition can receive configured repetitions from the gNB, while UEs that do not support repetition use standard single-transmission procedures. This dynamic adaptation ensures that each UE receives the appropriate coverage enhancement without unnecessarily increasing access delay for all UEs.
3Productivity
If the network allocates resources without knowing UE capabilities, then the resource allocation process is simple, but communication efficiency is reduced
Solution Approach 1:
Capability information is exchanged preliminarily during the initial access procedure through uplink signaling. The UE includes capability indicators in its initial uplink transmission, allowing the gNB to obtain necessary capability information before allocating resources for data transmission. This preliminary exchange minimizes the need for additional capability negotiation messages later, maintaining efficient communication.
4Measurement precision
If additional signaling is used to indicate UE capabilities, then resource allocation accuracy is improved, but signaling overhead increases
Solution Approach 1:
Instead of requiring complete capability descriptions, the system uses partial capability indication focusing on the most critical characteristics for resource allocation: RedCap UE status and Msg3 repetition capability. This partial indication provides sufficient information for the gNB to make accurate resource allocation decisions while minimizing the signaling overhead compared to comprehensive capability exchange.
Data Source
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AI summary
A system and method for providing early indications. In some embodiments, the method, includes: indicating, by a User Equipment, UE, as part of an initial access uplink transmission, a characteristic of the UE, the characteristic including at least one of the following: the UE is a reduced-capability UE and has a Msg3 repetition capability, the UE is a reduced-capability UE and lacks a Msg3 repetition capability, the UE is not a reduced-capability UE and has a Msg3 repetition capability, and the UE is not a reduced-capability UE and lacks a Msg3 repetition capability.