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Ue, network node and methods for handling 2-step and 4-step random access procedures

A network node, random access technology, applied in wireless network protocols, electrical components, wireless communications, etc., can solve problems such as random access performance impact, and achieve the effect of reducing adverse effects and optimizing performance

Pending Publication Date: 2021-09-17
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A third reason could be because the transmission collides with another UE101 that uses the same preamble but sends a different msg3 part, i.e. the preamble is detected but only one of the Msg3 parts is detected
This choice may have an impact on random access performance

Method used

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  • Ue, network node and methods for handling 2-step and 4-step random access procedures
  • Ue, network node and methods for handling 2-step and 4-step random access procedures
  • Ue, network node and methods for handling 2-step and 4-step random access procedures

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Experimental program
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Embodiment Construction

[0088] The present disclosure relates to determining whether the UE should retransmit the entire msgA using the msg3 grant. This selection can be made based on minimizing latency and optimizing system utilization. In NR-U systems, it can also maximize the probability of successful transmission.

[0089] image 3 A communication system 100 is depicted, which may be a wireless communication network, also sometimes referred to as a wireless communication system, a cellular radio system, or a cellular network. The communication system 100 may generally be a 5G system, a 5G network, an NR-U or next generation system or network, LAA, MulteFire, 4G system, 3G system, 2G system, another generation system, or any other suitable system. The communication system 100 may alternatively be an earlier system than the 5G system. The communication system 100 may support other technologies such as Long Term Evolution (LTE), LTE-Advanced / LTE Pro, such as LTE Frequency Division Duplex (FDD), L...

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Abstract

The present disclosure relates to a method performed by a UE (101) for handling 2-step and 4-step RA procedures in a communications system (100). The UE (101) transmits a msgA comprising a preamble and a msg3 to a network node (103). The UE (101) applies5a 2-step RA procedure when transmitting msgA. Based on a criterion, the UE (101) determines to fallback from the 2-step RA procedure to a 4-step RA, procedure. The criterion is that a maximum number of msgA transmissions has been exceeded or receipt of an indicator indicating that the UE (101) should fallback from the 2-step RA procedure to the 4-step RA procedure.

Description

technical field [0001] The present disclosure generally relates to user equipment (UE), methods performed by the UE, network nodes, and methods performed by the network nodes. More specifically, the present disclosure relates to handling 2-step and 4-step random access (RA) procedures, eg, the handling of fallbacks from 2-step RA procedures to 4-step RA procedures. Background technique [0002] Next-generation systems are expected to support a wide range of use cases with different needs, ranging from fully mobile devices to stationary Internet of Things (IoT) devices or fixed wireless broadband devices. In New Radio (NR), the 3rd Generation Partnership Project (3GPP) will support both Licensed Assisted Access (LAA) and standalone unlicensed operation. Therefore, 3GPP will study the procedures for Physical Random Access Channel (PRACH) transmission and / or Scheduling Request (SR) transmission in unlicensed spectrum. In the following, a channel sensing scheme based on a List...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W74/0841H04W74/0866H04W80/02H04W72/23
Inventor 詹·克里斯托弗里森王民
Owner TELEFON AB LM ERICSSON (PUBL)
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