Method and apparatus for transmitting reception acknowledgement in wireless communication system

• US 9,660,787 B2
• Filed: 08/07/2013
• Issued: 05/23/2017
• Est. Priority Date: 08/07/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon, Seo, Hanbyul, Chae, Hyukjin
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Wei, Siren
• Application Number:
  US14/420,286
• Publication Number:
  US 20150229455A1
• Time in Patent Office: 1,385 Days
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

One embodiment of the present invention is a method in which a terminal transmits an acknowledgement of reception performed through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system, the method comprising the steps of: decoding the EPDCCH in both a first EPDCCH physical resource block (PRB) set and a second EPDCCH PRB set; and transmitting an acknowledgement of reception performed through each EPDCCH. The resource indices for transmitting an acknowledgement of reception performed through each EPDCCH are determined in mutually different manner based on the type of the EPDCCH PRB set, whether or not the number of the PRB pairs contained in each EPDCCH PRB set corresponds to each other, and/or whether or not the EPDCCH PRB sets overlap.

Claims

1. A method for transmitting reception acknowledgement for an enhanced physical downlink control channel (EPDCCH) by a user equipment (UE) in a wireless communication system, the method comprising:

decoding an EPDCCH in each of a first EPDCCH Physical Resource Block (PRB) set and a second EPDCCH PRB set; and

transmitting a reception acknowledgement for each of the EPDCCHs,

wherein one of a PRB pair ratio between the first and second EPDCCH PRB sets or an Enhanced Control Channel Element (ECCE) index change in an overlapping EPDCCH PRB set of the first EPDCCH PRB set and the second EPDCCH PRB set is used for determining a resource index for transmitting the reception acknowledgement for each of the EPDCCHs.

2. The method according to claim 1, wherein, when the first and second EPDCCH PRB sets are intended for transmission of a distributed EPDCCH, and a number of PRB pairs included in the first EPDCCH PRB set is different from a number of PRB pairs included in the second EPDCCH PRB set,

the resource index for transmitting the reception acknowledgement for the EPDCCH of one of the first and second EPDCCH PRB sets is determined in consideration of a PRB pair ratio between the first and second EPDCCH PRB sets, the one of the first and second EPDCCH PRB sets including a smaller number of PRB pairs than the other one of the first and second EPDCCH PRB sets.

3. The method according to claim 2, wherein the PRB pair ratio is a ratio of the number of PRB pairs included in the other one of the first and second EPDCCH PRB sets to the number of PRB pairs included in the one of the first and second EPDCCH PRB sets having the smaller number of PRB pairs.

4. The method according to claim 2, wherein the first EPDCCH PRB set and the second EPDCCH PRB set include PRB pairs overlapping each other.

5. The method according to claim 2, wherein the resource index for transmitting the reception acknowledgement for the EPDCCH of the one of the first and second) EPDCCH PRB sets having the smaller number of PRB pairs, n_PUCCH-DECCE⁽¹⁾, is determined by the following equation:

n_PUCCH-DECCE⁽¹⁾=N_PUCCH⁽¹⁾+T×

n_DECCE-set2,

wherein N_PUCCH⁽¹⁾ denotes a starting point of Physical Uplink Control Channel (PUCCH) resource indexes and has a value delivered through higher layer signaling, T denotes a value obtained by dividing the number of PRB pairs of the other one of the first and second EPDCCH PRB sets by the number of PRB pairs of the one of the first and second EPDCCH PRB sets having the smaller number of PRB pairs, and n_DECCE-set2 denotes a lowest ECCE index of the one of the first and second EPDCCH PRB sets having the smaller number of PRB pairs.

6. The method according to claim 1, wherein the resource index for transmitting the reception acknowledgement for the EPDCCH of the one of the first and second EPDCCH PRB sets including the smaller number of PRB pairs, n_PUCCH-DECCE⁽¹⁾, is determined by the following equation:

n_PUCCH-DECCE⁽¹⁾=N_PUCCH⁽¹⁾+T×

n_DECCE-set2−

X,

wherein, N_PUCCH⁽¹⁾ denotes a starting point of Physical Uplink Control Channel (PUCCH) resource indexes and has a value delivered through higher layer signaling, T denotes a value obtained by dividing the number of PRB pairs of the other one of the first and second EPDCCH PRB sets by the number of PRB pairs of the one of the first and second EPDCCH PRB sets having the smaller number of PRB pairs, X is a lowest index of the PRB pairs, and n_DECCE-set2 denotes a lowest Enhanced Control Channel Element (ECCE) index of the one of the first and second EPDCCH PRB sets having the smaller number of PRB pairs.

7. The method according to claim 1, wherein, when the first and second EPDCCH PRB sets are for transmission of a localized EPDCCH and transmission of a distributed EPDCCH, respectively, and the first EPDCCH PRB set is a subset of the second EPDCCH PRB set,

an ECCE index in the first EPDCCH PRB set is replaced with an ECCE index given when the first EPDCCH PRB set has the same number of PRB pairs as the second EPDCCH PRB set.

8. The method according to claim 1, wherein, when the first and second EPDCCH PRB sets are for transmission of a localized EPDCCH and transmission of a distributed EPDCCH, respectively, and the first EPDCCH PRB set is a subset of the second EPDCCH PRB set,

the resource index for transmitting the reception acknowledgement for the EPDCCH of the first EPDCCH PRB set, n_PUCCH-DECCE⁽¹⁾, is determined by the following equation:

9. The method according to claim 1, wherein, when the first and second EPDCCH PRB sets are for transmission of a localized EPDCCH and transmission of a distributed EPDCCH, respectively, and the second EPDCCH PRB set is a subset of the first EPDCCH PRB set,

an ECCE index in the second EPDCCH PRB set is changed to an ECCE index in the first EPDCCH PRB set including the same Enhanced Resource Element Group (EREG) as the second EPDCCH PRB set in determining the resource index for transmitting the reception acknowledgement for the EPDCCH of the second EPDCCH PRB set.

10. The method according to claim 1, wherein, when the first and second EPDCCH PRB sets are for transmission of a localized EPDCCH and transmission of a distributed EPDCCH, respectively, and the second EPDCCH PRB set is a subset of the first EPDCCH PRB set, the resource index for transmitting the reception acknowledgement for the EPDCCH of the first EPDCCH PRB set, n_PUCCH-LECCE⁽¹⁾, is determined by the following equation:

11. The method according to claim 10, wherein, when d=4 in a normal cyclic prefix, k_p=p−

107, pε

{107,108,109,110}.

12. The method according to claim 1, wherein the first and second EPDCCH PRB sets are indicated by higher layer signaling.

13. A user equipment (UE) in a wireless communication system, the UE comprising:

a receive device; and

a processor,

wherein the processor decodes an enhanced physical downlink control channel (EPDCCH) which is received via the receive device in each of a first EPDCCH Physical Resource Block (PRB) set and a second EPDCCH PRB set, and transmits a reception acknowledgement for each of the EPDCCHs,

wherein one of a PRB pair ratio between the first and second EPDCCH PRB sets or an Enhanced Control Channel Element (ECCE) index change in an overlapping EPDCCH PRB set of the first EPDCCH PRB set and the second EPDCCH PRB set is used for determining a resource index for transmitting the reception acknowledgement for each of the EPDCCHs.