Resource allocation in communications system

Patent metadata

Field	Value
Publication number	US-9729295-B2
Application number	US-201314041431-A
Country	US
Kind code	B2
Filing date	Sep 30, 2013
Priority date	Sep 28, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An exemplary embodiment discloses a multi-subframe physical uplink control channel PUCCH resource arrangement for PUCCH format 1a/1b resource allocation for enhanced physical downlink control channel EPDCCH in time division duplex TDD transmission. A definition of a semi-static offset for each EPDCCH set is extended by considering multiple downlink subframes, and a dynamic offset mechanism is enhanced to avoid resource collision between multiple DL subframes.

First claim

The invention claimed is:

1. A method for resource allocation in a communications system, characterized by
determining, in a network apparatus, PUCCH format 1a/1b resources for HARQ-ACK for time division duplex signalling based on
an index of the first enhanced control channel element used for transmission of a corresponding EPDCCH downlink assignment in a downlink subframe,
the index of the downlink subframe in which the EPDCCH downlink assignment is transmitted, and
one or more configured parameters,
wherein the one or more configured parameters comprise a dynamic offset modifier,
a first semi-static user terminal-specific resource starting offset defined for an EPDCCH set, and
a second user terminal-specific resource offset defined for each EPDCCH set.

2. A method as claimed in claim 1 , characterized in that a multi-subframe PUCCH format 1a/1b resource allocation is carried out for HARQ-ACK corresponding to PDSCH scheduled via EPDCCH.

3. A method as claimed in claim 1 , characterized in that when M=1, the resource determination is independent of the second user terminal-specific resource offset, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

4. A method as claimed in claim 1 , characterized in that for time division duplex signalling when M>1, the second user terminal-specific resource offset impacts resource allocation when PUCCH HARQ-ACK resources for multiple downlink subframes map into a single uplink subframe, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

5. A method as claimed in claim 1 , characterized in that the offset for each EPDCCH set applied in each downlink subframe is dependent on the first semi-static user terminal-specific resource starting offset, second user terminal-specific resource offset, and m, where m(0 . . . M−1) is a relative index of the downlink subframe, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

6. A method as claimed in claim 1 , characterized in that the dynamic offset modifier k is dependent on an antenna port or a power control command.

7. A method as claimed in claim 1 , characterized in that the dynamic offset modifier is applied such that it is independent on a subframe index m, wherein the dynamic offset modifier is derived based on downlink control information DCI that EPDCCH is carrying.

8. A method as claimed in claim 1 , characterized in that a dynamic offset modifier is applied such that the dynamic offset modifier depends on a subframe index m, wherein multiple sets of dynamic offset modifiers are defined to be a matrix C with (M−1) columns and N rows, N corresponding to the number of options to perform dynamic switching, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback, and the subframe index m is used as one factor to determine the value of the dynamic offset modifier k(n, m), where n is an index of dynamic switching option signalled as downlink control information DCI via EPDCCH.

9. A method as claimed in claim 8 , characterized in that the resource index of the ACK/NACK resource corresponding to the m-th subframe X m is derived from the resource index of the first subframe X 0 as X 0 +C(m), where C(m) is a predefined constant number.

10. A method as claimed in claim 9 , characterized in that the matrix C is configured via a protocol layer higher than the physical layer.

11. A method as claimed in claim 1 , characterized in that the dynamic offset modifier k is an antenna port-specific offset associated with antenna port p, where p is the antenna port allocated to the first control channel element CCE of corresponding EPDCCH or other explicitly signalled or implicitly derived parameter.

12. A method as claimed in claim 1 , characterized by scheduling the PUCCH format 1a/1b resources for EPDCCH for time division duplex signalling based on formula I:
n PUCCH (1) =N UE-PUCCH-TDD *m+n eCCE +N UE-PUCCH (1) +k,
where
n PUCCH (1) is a PUCCH format 1a/1b resource to be allocated for a HARQ-ACK signal;
N UE-PUCCH (1) is the first semi-static user terminal-specific resource starting offset defined for an EPDCCH set;
N UE-PUCCH-TDD (1) is the second user terminal-specific resource offset defined for EPDCCH sets when M>1, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback, m being a relative index of a downlink subframe, wherein 0≦m≦M−1;
n eCCE is an index of the first enhanced control channel element eCCE used for transmission of a corresponding EPDCCH downlink assignment in a downlink subframe n−k m , where m is the relative index of the downlink subframes and 0≦m≦M−1;
k is a dynamic offset modifier.

13. A computer program product comprising a non-transitory computer-readable storage medium bearing computer program code embodied therein for use with a computer, the computer program code comprising code for performing the method according to claim 1 .

14. An apparatus comprising:
at least one processor; and
at least one memory including a computer program code, the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform the following:
determine PUCCH format 1a/1b resources for HARQ-ACK for time division duplex signalling based on
an index of the first enhanced control channel element used for transmission of a corresponding EPDCCH downlink assignment in a downlink subframe,
the index of the downlink subframe in which the EPDCCH downlink assignment is transmitted, and
one or more configured parameters,
wherein the one or more configured parameters comprise a dynamic offset modifier,
a first semi-static user terminal-specific resource starting offset defined for an EPDCCH set, and
a second user terminal-specific resource offset defined for each EPDCCH set.

15. An apparatus as claimed in claim 14 , characterized in that the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to carry out a multi-subframe PUCCH format 1a/1b resource allocation for HARQ-ACK corresponding to PDSCH scheduled via EPDCCH.

16. An apparatus as claimed in claim 14 , characterized in that when M=1, the resource determination is independent of the second user terminal-specific resource offset, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

17. An apparatus as claimed in claim 14 , characterized in that for time division duplex signalling when M>1, the second user terminal-specific resource offset impacts resource allocation when PUCCH HARQ-ACK resources for multiple downlink subframes map into a single uplink subframe, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

18. An apparatus as claimed in claim 14 , characterized in that the offset for each EPDCCH set applied in each downlink subframe is dependent on the first semi-static user terminal-specific resource starting offset, second user terminal-specific resource offset, and m, where m(0 . . . M−1) is a relative index of the downlink subframe, M being the number of downlink subframes associated with an uplink subframe for HARQ-ACK feedback.

19. An apparatus as claimed in claim 14 , characterized in that the at least one memory and the computer program code are configured to, with the at least one processor, cause the appa

Assignees

• Nokia Siemens Networks Oy
• Nokia Solutions & Networks Oy

Inventors

• Zhang Li
• Lunttila Timo Erkki
• Tiirola Esa Tapani

Classifications

• H04L5/1469

  using time-sharing · CPC title

• H04L5/0055

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

• H04L5/0053 Primary

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

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title