Secondary cell synchronization for carrier aggregation

A carrier aggregation, secondary cell technology, applied in the directions of synchronization devices, electrical components, wireless communication, etc., can solve the problem of not including

Active Publication Date: 2016-04-27
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, they may not include cell-specific reference symbols

Method used

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  • Secondary cell synchronization for carrier aggregation
  • Secondary cell synchronization for carrier aggregation
  • Secondary cell synchronization for carrier aggregation

Examples

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Embodiment Construction

[0114] Some examples will be described below. These embodiments are intended to be illustrative examples only and are by no means restrictive.

[0115] As will be explained below (for example, in conjunction with the attached Figure 12 ), some embodiments relate to a method for carrier aggregation scenarios, where the purpose is to achieve fast synchronization of user equipment (UE) with an unknown SCell, and to send out a CSI report within the required activation time. According to some of these embodiments, multiple activations (eg, two or more synchronization to cells, channel estimation, and measurement for CSI reporting) may be scheduled simultaneously. Thus, as soon as sufficient synchronization is achieved, valid CSI reports (based on simultaneously performed measurements) are sent directly from the UE into the network, whereby the UE can be quickly scheduled on the SCell.

[0116] According to some embodiments, synchronization with an unknown SCell may be based on s...

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Abstract

A carrier aggregation application method is provided of attaining time synchronization to a secondary cell for a wireless communication device usable in a cellular communication network. The method comprises, if a time reference of the secondary cell is unknown to the wireless communication device: setting a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; performing a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; performing preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; setting, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and transmitting a channel state information report comprising the channel quality indicator to the cellular communication network. An arrangement for a wireless communication device usable in a cellular communication network, adapted to attain time synchronization to a secondary cell of a carrier aggregation application is also disclosed. A modem comprising the arrangement and wireless communication device comprising the arrangement are also disclosed.

Description

technical field [0001] The present invention generally relates to the technical field of carrier aggregation. More specifically, the present invention relates to secondary cell activation in carrier aggregation scenarios. Background technique [0002] Throughout this specification, the Universal Mobile Telecommunications Standard, Long Term Evolution (UMTS-LTE, also known as Evolved UMTS Terrestrial Radio Access Network - E-UTRAN - and promoted by the Third Generation Partnership Project - 3GPP will be used. ) notation and examples. It should be noted, however, that this is not meant to be limiting. Rather, the embodiments and application scenarios are equally applicable with respect to other known or future communication standards. DL means downlink and UL means uplink. [0003] carrier aggregation [0004] Carrier aggregation was introduced in Release 10 of the E-UTRAN standard for E-UTRAN to be able to meet the 1000Mbit / s requirement of 4G. Another purpose of carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
Inventor D·昊J·阿克斯蒙P·刘
Owner TELEFON AB LM ERICSSON (PUBL)
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