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Aligned configuration for random access channel-less handover/secondary cell group change

A technology for random access to channels and secondary cells, applied in wireless communication, electrical components, etc., and can solve problems such as handover or SCG change process failure

Pending Publication Date: 2021-11-09
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The target node also does not know when the timer expires in the UE (e.g. when there is a problem with the uplink transmission in the target cell), resulting in failure of the handover or SCG change procedure

Method used

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  • Aligned configuration for random access channel-less handover/secondary cell group change
  • Aligned configuration for random access channel-less handover/secondary cell group change
  • Aligned configuration for random access channel-less handover/secondary cell group change

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Embodiment Construction

[0049] Some of the embodiments contemplated herein will now be described more fully with reference to the accompanying drawings. However, other embodiments are included within the scope of the subject matter disclosed herein, and the disclosed subject matter should not be construed as limited to only the embodiments set forth herein; rather, these embodiments are provided by way of example to teach skilled artisans The person conveys the scope of the subject.

[0050] Generally, all terms used herein are to be interpreted according to their ordinary meanings in the relevant technical field, unless a different meaning is implied and / or clearly given by the context in which it is used. Unless expressly stated otherwise, all references a / an / to said element, device, component, means, step, etc. are to be construed openly as referring to at least one instance of said element, device, component, means, step, etc. Any step disclosed herein does not have to be performed in the exact ...

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Abstract

A process allows a UE to acquire an SEN before accessing a target base station / node during a RACH-less handover. The SEN may be provided to the UE in various ways. For example, the SEN may be provided as part of a handover command message (e.g., RRCReconfiguration) or a master information block (MIB). In this manner, the UE acquires the SEN before accessing the target base station / node, which allows the target base station / node and the UE to effect certain timings for the handover. For example, the target base station / node and the UE may set time bounds in which the handover must occur. As another example, different types of uplink grants may be set.

Description

technical field [0001] The present disclosure relates generally to wireless communications, and more particularly, to handovers in wireless networks. Background technique [0002] As part of 3GPP Release 14, Random Access Channel (RACH)-free handover (HO) and RACH-free Secondary Cell Group (SCG) change have been specified for Long Term Evolution (LTE) to reduce the interruption time at handover and SCG change respectively . The RACH-less handover procedure means that no Msg1 transmission (eg RACH preamble transmission) or Msg2 transmission (eg network acknowledgment with a random access response message) by the user equipment (UE) is performed when accessing the target cell during handover. [0003] Through Msg2, the network provides the UE with an uplink (UL) grant for transmission of more information to the network in so-called Msg3. Msg1 is also used inter alia by the network to determine the timing advance (TA) value that the UE should use in its uplink transmissions f...

Claims

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Application Information

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IPC IPC(8): H04W36/00
CPCH04W36/08H04W36/00725H04W36/0072H04W72/23
Inventor J·贝里奎斯特O·奥尔松J·鲁内P·瓦伦丁
Owner TELEFON AB LM ERICSSON (PUBL)
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