PUCCH resource compression for EPDCCH in TDD mode

• US 9,532,316 B2
• Filed: 12/17/2013
• Issued: 12/27/2016
• Est. Priority Date: 01/14/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Han, Seunghee, Zhu, Yuan, Chen, Xiaogang, Fwu, Jong-Kae
• Primary Examiner(s): Moutaouakil, Mounir
• Application Number:
  US14/652,590
• Publication Number:
  US 20150341922A1
• Time in Patent Office: 1,106 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 47/12 Avoiding congestion; Recovering from congestion
• CPC Class Codes: H04L 47/20 Traffic policing
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0247 based on conditions of the access network or the infrastructure network central resource management H04W28/16
• CPC Class Codes: H04W 28/0252 per individual bearer or channel dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Techniques are described for compressing the PUCCH resources reserved for acknowledging downlink data transmissions when those resources are implicitly signaled by EPDCCHs that schedule the downlink transmissions in TDD mode. An acknowledgement resource offset field transmitted in the EPDCCH is configured to correspond to one or more values that compress the region in PUCCH resource index space that would otherwise be reserved for the subframes of a bundling window.

Claims

1. A method for operating an evolved Node B (eNB) in time division duplex (TDD) mode, comprising:

via an enhanced physical downlink control channel (EPDCCH) made up of indexed enhanced control channel elements (ECCEs), transmitting downlink control information (DCI) to a UE that grants a physical downlink shared channel (PDSCH) resource for a downlink subframe belonging to a bundling window and assigning a physical uplink control channel (PUCCH) resource index to the UE for acknowledging the PDSCH transmission calculated as a function of the lowest index of the ECCEs used to construct the EPDCCH added to the number of ECCEs in EPDCCHs that grant PDSCH resources for earlier subframes that belong to the bundling window; and

,

transmitting an acknowledgment resource offset (ARO) in an ARO field of the DCI that instructs the UE to shift the PUCCH resource index by an amount equal to the value of the ARO and wherein, for subframe subsequent to the earliest subframe of the bundling window, values for the ARO are selected from a group that includes a value that shifts the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of the bundling window.

2. The method of claim 1 wherein, for a downlink subframe having a relative index m between 0 and M−

1 with M being the number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index n_PUCCH⁽¹⁾ is used to determine the resource block pair, cyclic shift, and orthogonal cover sequence of a format 1 PUCCH and is computed as;

3. The method of claim 2, wherein if the PUCCH is to be transmitted over two antenna ports using spatial orthogonal-resource transmit diversity (SORTD), the PUCCH resource index n_PUCCH⁽¹⁾ is computed for one antenna port and incremented by 1 for the other antenna port.

4. The method of claim 2 wherein, for m>

0, the value of the ARO is selected from the following set of elements;

5. The method of claim 2 wherein, for m=0, the value of the ARO is selected from the following set of elements:

{−

2, −

1, 0, 2}.

6. The method of claim 2 wherein, for m>

0, the value of the ARO is selected from a set that includes the following set of elements;

7. The method of claim 2 wherein, for m>

0, the value of the ARO is selected from the following set of elements;

8. The method of claim 7 wherein α

=0 and β

=2.

9. The method of claim 2 further comprising receiving acknowledgements from the UE for PDSCH transmissions in subframes of the bundling window in a PUCCH of a subsequent uplink subframe where the PUCCH contains uplink control information (UCI) with a two-bit acknowledgement field.

10. The method of claim 9 further comprising combining the value of the two-bit acknowledgment field in the UCI with the PUCCH resource selected by the UE to transmit the PUCCH from among the PUCCH resource indices computed by the UE for PDSCH transmissions in subframes of the bundling window to derive up to four separate acknowledgements.

11. An evolved Node B (eNB) for operating in an LTE (Long Term Evolution) network, comprising:

processing circuitry and a radio interface for communicating with user equipments (UEs), wherein the processing circuitry when operating in time division duplex (TDD) mode is to;

transmit downlink control information (DCI) to a UE that grants a physical downlink shared channel (PDSCH) resource for a downlink subframe belonging to a bundling window via an enhanced physical downlink control channel (EPDCCH) made up of indexed enhanced control channel elements (ECCEs);

assign a physical uplink control channel (PUCCH) resource index to the UE for acknowledging the PDSCH transmission calculated as a function of the lowest index of the ECCEs used to construct the EPDCCH added to the number of ECCEs in EPDCCHs that grant PDSCH resources for earlier subframes that belong to the bundling window;

transmit an acknowledgment resource offset (ARO) in an ARO field of the DCI that instructs the UE to shift the PUCCH resource index by an amount equal to the value of the ARO; and

,

wherein the value of the ARO field, for subframes subsequent to the earliest subframe of the bundling window, corresponds to an ARO value selected from a group that includes a value that shifts the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of the bundling window.

12. The eNB of claim 11 wherein, for a downlink subframe having a relative index m between 0 and M−

1 with M being the number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index n_PUCCH⁽¹⁾ is used to determine the resource block pair, cyclic shift, and orthogonal cover sequence of a format 1 PUCCH and is computed as;

13. The eNB of claim 12 wherein, for m>

0, the value of the ARO field corresponds to an ARO value selected from the following set of elements;

14. The eNB of claim 12 wherein, for m=0, the value of the ARO field corresponds to an ARO value selected from the following set of elements:

{−

2, −

1, 0, 2}.

15. The eNB of claim 12 wherein, for m>

0, the value of the ARO field corresponds to an ARO value selected from a set that includes the following set of elements;

16. The eNB of claim 12 wherein, for m>

0, the value of the ARO field corresponds to an ARO value selected from the following set of elements;

17. A user equipment (UE) for operating in an LTE (Long Term Evolution) network, comprising:

processing circuitry and a radio interface for communicating with an evolved Node B (eNB), wherein the processing circuitry when operating in time division duplex (TDD) mode is to;

receive downlink control information (DCI) from the eNB that grants a physical downlink shared channel (PDSCH) resource for a downlink subframe belonging to a bundling window via an enhanced physical downlink control channel (EPDCCH) made up of indexed enhanced control channel elements (ECCEs);

calculate a physical uplink control channel (PUCCH) resource index to the UE for acknowledging the PDSCH transmission as a function of the lowest index of the ECCEs used to construct the EPDCCH added to the number of ECCEs in EPDCCHs that grant PDSCH resources for earlier subframes that belong to the bundling window;

receive an acknowledgment resource offset (ARO) value in an ARO field of the DCI that instructs the UE to shift the PUCCH resource index by an amount equal to the value of the ARO; and

,

wherein the value of the ARO field, for subframes subsequent to the earliest subframe of the bundling window, corresponds to an ARO value selected from a group that includes a value that shifts the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of the bundling window.

18. The UE of claim 17 wherein, for a downlink subframe having a relative index m between 0 and M−

1 with M being the number of subframes in the bundling window and with m=0 representing the earliest subframe, the PUCCH resource index n_PUCCH⁽¹⁾ is used to determine the resource block pair, cyclic shift, and orthogonal cover sequence of a format 1 PUCCH and is computed as;

19. The UE of claim 18 wherein, for m>

0, the value of the ARO field corresponds to an ARO value selected from the following set of elements;

20. The UE of claim 18 wherein, for m=0, the value of the ARO field corresponds to an ARO value selected from the following set of elements:

{−

2, −

1, 0, 2}.