Base station, terminal, communication system, communication method, and integrated circuit

• US 9,560,644 B2
• Filed: 07/08/2013
• Issued: 01/31/2017
• Est. Priority Date: 08/01/2012
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kusashima, Naoki, Shimezawa, Kazuyuki, Nogami, Toshizo, Imamura, Kimihiko, Nakashima, Daiichiro
• Primary Examiner(s): Jaroenchonwanit, Bunjob
• Application Number:
  US14/418,319
• Publication Number:
  US 20150304993A1
• Time in Patent Office: 1,303 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

In a wireless communication system in which a base station and a terminal communicate, the base station effectively transmits control information for the terminal.

The base station that communicates with the terminal by using resource elements configured with OFDM symbols and subcarriers, and resource block pairs configured with a predetermined number of resource elements includes a second control channel generation unit that generates a second control channel which is transmitted by using a reference signal of an antenna port different from an antenna port of a first control channel. The second control channel is configured with predetermined E-REGs, and transmitted to the terminal, by using one or more E-CCEs. The resource block pair is configured with a predetermined number of E-REG sets. The E-REG set is configured with a predetermined number of the E-REGs. The E-REG is configured with a predetermined number of resource elements.

Claims

1. A base station apparatus configured to communicate with a terminal apparatus, the base station apparatus comprising:

control circuitry configured to determine one or several enhanced control channel elements used to receive an enhanced physical downlink control channel, the one or several enhanced control channel elements included in a resource block set corresponding to a plurality of resource block pairs, the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission; and

transmitting circuitry configured to transmit the enhanced physical downlink control channel, the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission, wherein

each of the plurality of resource block pairs includes a specific number of enhanced resource element groups,

first resource elements except second resource elements carrying demodulation reference signal in each of the plurality of resource block pairs are numbered,

each of the specific number of enhanced resource element groups is constituted of third resource elements with a same number in each of the plurality of resource block pairs, the third resource elements being a part of the first resource elements,

each of the one or several enhanced control channel elements consists of a plurality of enhanced resource element groups,

for the localized transmission, the control circuitry determines first enhanced resource element groups for each of the one or several enhanced control channel elements and the first enhanced resource element groups are in a resource block pair among the plurality of resource block pairs,

for the distributed transmission, the control circuitry determines second enhanced resource element groups for each of the one or several enhanced control channel elements and the second enhanced resource element groups are in a plurality of resource block pairs among the plurality of resource block pairs, and

first combination and second combination are common each other, the first combination being for the localized transmission, the second combination being for the distributed transmission, the first and the second combinations being combinations of numbers of enhanced resource element groups corresponding to each of the one or several enhanced control channel elements.

2. A terminal apparatus configured to communicate with a base station apparatus, the terminal apparatus comprising:

control circuitry configured to determine one or several enhanced control channel elements used to receive an enhanced physical downlink control channel, the one or several enhanced control channel elements included in a resource block set corresponding to a plurality of resource block pairs; and

receiving circuitry configured to receive the enhanced physical downlink control channel the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission, wherein

each of the plurality of resource block pairs includes a specific number of enhanced resource element groups,

first resource elements except second resource elements carrying demodulation reference signal in each of the plurality of resource block pairs are numbered,

each of the specific number of enhanced resource element groups is constituted of third resource elements with a same number in each of the plurality of resource block pairs, the third resource elements being a part of the first resource elements,

each of the one or several enhanced control channel elements consists of a plurality of enhanced resource element groups,

for the localized transmission, the control circuitry determines first enhanced resource element groups for each of the one or several enhanced control channel elements and the first enhanced resource element groups are in a resource block pair among the plurality of resource block pairs,

for the distributed transmission, the control circuitry determines second enhanced resource element groups for each of the one or several enhanced control channel elements and the second enhanced resource element groups are in a plurality of resource block pairs among the plurality of resource block pairs, and

first combination and second combination are common each other, the first combination being for the localized transmission, the second combination being for the distributed transmission, the first and the second combinations being combinations of numbers of enhanced resource element groups corresponding to each of the one or several enhanced control channel elements.

3. A communicating method of a base station apparatus that communicates with a terminal apparatus, the communicating method comprising:

determining one or several enhanced control channel elements used to receive an enhanced physical downlink control channel, the one or several enhanced control channel elements included in a resource block set corresponding to a plurality of resource block pairs, the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission; and

transmitting the enhanced physical downlink control channel, the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission, wherein

each of the plurality of resource block pairs includes a specific number of enhanced resource element groups,

first resource elements except second resource elements carrying demodulation reference signal in each of the plurality of resource block pairs are numbered,

each of the specific number of enhanced resource element groups is constituted of third resource elements with a same number in each of the plurality of resource block pairs, the third resource elements being a part of the first resource elements,

each of the one or several enhanced control channel elements consists of a plurality of enhanced resource element groups,

for the localized transmission, the communicating method further comprises determining first enhanced resource element groups for each of the one or several enhanced control channel elements and the first enhanced resource element groups are in a resource block pair among the plurality of resource block pairs,

for the distributed transmission, the communicating method further comprises determining second enhanced resource element groups for each of the one or several enhanced control channel elements and the second enhanced resource element groups are in a plurality of resource block pairs among the plurality of resource block pairs, and

first combination and second combination are common each other, the first combination being for the localized transmission, the second combination being for the distributed transmission, the first and the second combinations being combinations of numbers of enhanced resource element groups corresponding to each of the one or several enhanced control channel elements.

4. A communicating method of a terminal apparatus that communicates with a base station apparatus, the communicating method comprising:

determining one or several enhanced control channel elements used to receive an enhanced physical downlink control channel, the one or several enhanced control channel elements being included in a resource block set corresponding to a plurality of resource block pairs; and

receiving the enhanced physical downlink control channel, the enhanced physical downlink control channel being transmitted using either localized transmission or distributed transmission, wherein

each of the plurality of resource block pairs includes a specific number of enhanced resource element groups,

first resource elements except second resource elements carrying demodulation reference signal in each of the plurality of resource block pairs are numbered,

each of the specific number of enhanced resource element groups is constituted of third resource elements with a same number in each of the plurality of resource block pairs, the third resource elements being a part of the first resource elements,

each of the one or several enhanced control channel elements consists of a plurality of enhanced resource element groups,

for the localized transmission, the communicating method further comprises determining first enhanced resource element groups for each of the one or several enhanced control channel elements and the first enhanced resource element groups are in a resource block pair among the plurality of resource block pairs,

for the distributed transmission, the communicating method further comprises determining second enhanced resource element groups for each of the one or several enhanced control channel elements and the second enhanced resource element groups are in a plurality of resource block pairs among the plurality of resource block pairs, and

first combination and second combination are common each other, the first combination being for the localized transmission, the second combination being for the distributed transmission, the first and the second combinations being combinations of numbers of enhanced resource element groups corresponding to each of the one or several enhanced control channel elements.