Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types

Active Publication Date: 2013-09-05
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0049]In accordance with another embodiment of the present invention, a method and UE apparatus are provided to transmit a HARQ-ACK signal in a PUCCH in response to a detection of a first PDCCH or a second PDCCH transmitted from a base station in a TTI. The UE detects the first PDCCH over a first number of CCEs of a first type or the second PDCCH over a second number of CCEs of second type. The first PDCCH conveys a first DCI format including information fields. The second PDCCH conveys a second DCI format including all information fields of the first DCI format and further including a HPRO information field. The UE determines a first PUCCH resource, nPUCCH, as nPUCCH=nCCE+NPUCCH, w

Problems solved by technology

This configuration limits PDCCH capacity and cannot achieve interference coordination in the frequency domain among PDCCH transmissions from different NodeBs.
A direct extension of the maximum DL control region size to more than MsymbDL=3 OFDM symbols is not possible at least due to the requirement to support legacy UEs, which cannot be aware of such an extension.
The use of spatial multiplexing for transmissions of EPDCCHs associated with PDSCHs to respective UEs results in PUCCH resource collision for respective HARQ-ACK signal transmissions under the conventional PUCCH resource determination.
Due to the limited number of ECCEs per PRB, such as 4 ECCEs per PRB, the PUCCH resource c

Method used

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  • Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types
  • Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types
  • Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types

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second embodiment

[0092]the invention considers methods and apparatus for a UE to determine a PUCCH resource for HARQ-ACK signal transmission in response to the detection of an EPDCCH associated with a PDSCH (or SPS release) while also allowing for spatial multiplexing of EPDCCH transmissions. For brevity, the following analysis considers localized EPDCCHs but the same process applies for distributed EPDCCHs.

[0093]In a first approach, PUCCH resource collision for HARQ-ACK signal transmissions when respective, spatially multiplexed, EPDCCH transmissions use the same first LCCE, is avoided by restricting the use of spatial multiplexing only to transmissions of EPDCCHs, where at most one such EPDCCH schedules a PDSCH (the remaining EPDCCHs may schedule, for example, PUSCHs). However, in many applications, DL traffic is significantly larger than UL traffic and the previous restriction may significantly diminish the potential overhead reduction from applying spatial multiplexing to EPDCCH transmissions.

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third embodiment

[0106]the invention considers methods and apparatus for a UE to transmit an HARQ-ACK signal in a PUCCH using transmitter antenna diversity in response to the detection of an EPDCCH associated with a PDSCH.

[0107]A UE is configured by a NodeB whether or not to use transmitter antenna diversity for HARQ-ACK signal transmissions in a PUCCH. As a localized EPDCCH transmission in a PRB benefits from beamforming or FDS, it is likely to require less LCCEs than the DCCEs for a distributed EPDCCH transmission of a same DCI format. Consequently, for the same DCI format, localized EPDCCH transmissions over a single LCCE are more likely than distributed EPDCCH transmissions over a single DCCE as the former typically experience a higher SINR and can therefore be transmitted with a higher coding rate or modulation order thereby requiring fewer resources.

[0108]The increased likelihood of a localized first EPDCCH transmission being over a single LCCE places strong restrictions in a use of transmitte...

fourth embodiment

[0119]the present invention considers methods and apparatus for a UE to determine a PUCCH resource for a HARQ-ACK signal transmission in response to an EPDCCH detection, when possible ECCE aggregation levels for an EPDCCH type (distributed or localized) vary per subframe and, in particular, when an existence of an aggregation level of 1 ECCE varies per subframe.

[0120]The ECCE aggregation levels that may be used for an EPDCCH transmission may vary per subframe in order to adjust to a respective varying number of REs available for EPDCCH transmission in respective PRBs assigned to a UE in a subframe. For example, in FIG. 4, REs available for localized EPDCCH transmissions in a PRB exclude REs used by a conventional DL control region in the first 3 OFDM symbols, and REs used for transmitting various RS types (DMRS, CRS, etc.). Therefore, in FIG. 4, a total number of REs available for localized EPDCCH transmissions in a PRB is equal to 96, and an LCCE size is equal to 24 REs for 4 LCCEs...

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Abstract

Methods and apparatus are described for a User Equipment (UE) to transmit and for a base station to receive a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) signal in a resource of a Physical Uplink Control CHannel (PUCCH). The HARQ-ACK signal is transmitted from the UE in response to a detection of a PDCCH transmitted from the base station and conveying a DCI format that, depending on the PDCCH type, can include a HARQ-ACK PUCCH Resource Offset (HPRO) information field. The UE and the NodeB determine the PUCCH resource depending on the PDCCH type and, if the DCI format includes the HPRO, also depending on a PDCCH transmission type.

Description

PRIORITY[0001]The present application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Applications Nos. 61 / 606,772, 61 / 675,518, 61 / 684,997, and 61 / 717,998, which were filed in the United States Patent and Trademark Office on Mar. 5, 2012, Jul. 25, 2012, Aug. 20, 2012, and Oct. 24, 2012, respectively, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to wireless communication systems and, more particularly, to the transmission and reception of ACKnowledgements (ACK) signals.[0004]2. Description of the Art[0005]A communication system includes a DownLink (DL) that conveys transmission signals from transmission points, such as, for example, Base Stations (BSs), or NodeBs, to User Equipments (UEs). The communication system also includes an UpLink (UL) that conveys transmission signals from UEs to reception points, such as, for example BSs or NodeBs. A UE, which ...

Claims

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Application Information

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IPC IPC(8): H04W72/04
CPCH04W72/0406H04L1/1896H04L1/1861H04W72/20H04W72/21H04W72/23H04L1/1812
Inventor PAPASAKELLARIOU, ARISCHO, JOON-YOUNG
Owner SAMSUNG ELECTRONICS CO LTD
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