Terminal and method for receiving control information

Patent metadata

Field	Value
Publication number	US-9414261-B2
Application number	US-201414198230-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Sep 29, 2008
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A CCE+ number allocation method reduces the ACK/NACK (Acknowledgment/Negative Acknowledgment) collision probability in a mixed system containing an LTE (Long Term Evolution) system and an LTE+ (Long Term Evolution Advanced) system. A CCE (Control Channel Element)+ number is defined by selecting a number from CCE numbers of the CCE to contain PDCCH (Physical Downlink Control Channel) allocated in a resource element region constituting CCE+ where PDCCH+ is arranged. This can prevent overlapped selection of the CCE number and the CCE+ number even when the PDCCH and the PDCCH+ are simultaneously transmitted, thus making it possible to reduce the collision probability of ACK/NACK correlated to the CCE number and the CCE+ number.

First claim

The invention claimed is:

1. A terminal receiving a control information on a control channel element (CCE), the terminal comprising:
a receiver configured to receive a first downlink control information in a first communication system, the first downlink control information being mapped to at least one of CCEs+, wherein each of the CCEs+ is comprised of resource elements and the CCEs+ are numbered respectively by the CCE+ numbers that are assigned thereto; and
a transmitter configured to transmit an ACK/NACK signal on an uplink control channel, wherein the uplink control channel is associated with said at least one of CCEs+ to which the first downlink control information is mapped,
wherein the CCE+ numbers are respectively assigned to the CCEs+ such that each of the CCEs+ has a CCE+ number same as a CCE number that is assigned to a CCE, that is used for a second downlink control information in a second communication system and that is comprised of the resource elements, of which said each of the CCEs+ is comprised, and
a beginning position of at least one of the CCEs+ is matched with a position obtained by multiplying an L number of CCE(s) by an integer, wherein L is one of aggregation sizes of CCEs, which is used for the second downlink control information.

2. The terminal according to claim 1 , wherein the first communication system is a Long-Term-Evolution-Advanced (LTE+) system, and the second communication system is an LTE system.

3. The terminal according to claim 1 , wherein a size of the first downlink control information is greater than a size of the second downlink control information.

4. A method for receiving a control information on a control channel element (CCE), the method comprising:
receiving a first downlink control information in a first communication system, the first downlink control information being mapped to at least one of CCEs+, wherein each of the CCEs+ is comprised of resource elements and the CCEs+ are numbered respectively by the CCE+ numbers that are assigned thereto; and
transmitting an ACK/NACK signal on an uplink control channel, wherein the uplink control channel is associated with said at least one of CCEs+ to which the first downlink control information is mapped,
wherein the CCE+ numbers are respectively assigned to the CCEs+ such that each of the CCEs+ has a CCE+ number same as a CCE number that is assigned to a CCE, that is used for a second downlink control information in a second communication system and that is comprised of the resource elements, of which said each of the CCEs+ is comprised, and
a beginning position of at least one of the CCEs+ is matched with a position obtained by multiplying an L number of CCE(s) by an integer, wherein L is one of aggregation sizes of CCEs, which is used for the second downlink control information.

5. The method according to claim 4 , wherein the first communication system is a Long-Term-Evolution-Advanced (LTE+) system, and the second communication system is an LTE system.

6. The method according to claim 4 , wherein a size of the first downlink control information is greater than a size of the second downlink control information.

Assignees

• Sun Patent Trust

Inventors

• Horiuchi Ayako
• Nakao Seigo
• Imamura Daichi
• Nishio Akihiko

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04W28/044 Primary

  Electricity · mapped topic

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title