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Activating component carriers in a carrier aggregation

A technology of component carrier and access code, applied in the field of activation/deactivation of component carrier, which can solve the problem of imposing too much delay

Active Publication Date: 2012-11-14
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RRC signaling is not considered efficient for this purpose as its semi-static nature would impose too much delay, especially given the inherent delay and the introduction due to HARQ and ARQ when activating and / or deactivating any CC time uncertainty

Method used

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  • Activating component carriers in a carrier aggregation
  • Activating component carriers in a carrier aggregation
  • Activating component carriers in a carrier aggregation

Examples

Experimental program
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Embodiment Construction

[0032] As mentioned above, there is a need for a mechanism (besides RRC signaling) for activating and deactivating individual CCs for UEs, such that there is a relationship between both the eNB and the UE as to whether a particular cell in the CC is available for The response is sufficient and reliable in the sense that the CA and when it is available for the CA "simultaneously" agrees.

[0033] According to an exemplary embodiment of the present invention, a "PDCCH order" is sent from the eNB to the affected UE, which combines the CC activation indication with an indication of the codeword or preamble that will be used to access the newly activated CC. By way of example, the CC activation indication may be a 1-bit field in DCI format 1A (see eg 3GPP TS 36.212 v8.7.0 section 5.3.3.1.3), modified to accommodate this CC activation indication. By way of example and not limitation, this new DCI format may be referred to as DCI format 1AA, which has the same length as the prior art...

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Abstract

In an exemplary embodiment there is sent to a user equipment UE downlink control information DCI comprising an indication of an access codeword and an indication that at least one component carrier CC is activated for the UE, and there is received from the UE the access codeword which is an acknowledgement that the UE has activated the at least one CC. The access codeword is received on an uplink channel which a) lies in the at least one activated CC if there is an activated uplink channel in the activated CC, or b) is previously activated if there is no activated uplink channel in the activated CC. In another embodiment DCI comprising the above two indications is received from a network, the received indications are used to select and access the at least one CC; and activating the CC is acknowledged by sending the access codeword.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to wireless communication systems, methods, devices and computer programs, and more particularly to activation / deactivation of component carriers in systems employing carrier aggregation. Background technique [0002] This section is intended to provide a background or context for the invention recited in the claims. The descriptions herein may include concepts that can be traced back, but not necessarily concepts that have been previously envisioned or traced back. Therefore, unless otherwise indicated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section. [0003] The following abbreviations that may be found in the specification and / or drawings are defined as follows: [0004] [0005] [0006] In a communication system known as Evolved UTR...

Claims

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Application Information

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IPC IPC(8): H04W72/04
CPCH04L5/0007H04L5/001H04L5/0096H04L5/0098H04L1/1607H04L5/003H04W72/0453H04W72/042H04W74/006H04W28/04H04W72/23
Inventor L·达尔斯加德J·奥雅拉J·凯科南M·乔基米斯T·恩托南
Owner NOKIA TECHNOLOGLES OY