PUCCH resource compression for EPDCCH in TDD mode

• US 10,045,336 B2
• Filed: 01/10/2018
• Issued: 08/07/2018
• 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:
  US15/867,069
• Publication Number:
  US 20180132233A1
• Time in Patent Office: 209 Days
• 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 comprising:

receiving, at a user equipment (UE), downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe;

receiving 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

determining a physical uplink control channel (PUCCH) resource index to acknowledge PDSCH transmissions as a function of the lowest ECCE index used to construct the EPDCCH, wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of a bundling window, 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;

2. The method of claim 1, wherein, for m>

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

3. The method of claim 1, 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}.

4. The method of claim 1, wherein the PUCCH resource index is calculated further based on EPDCCH added to the number of ECCEs in EPDCCHs derived for the UE and added to an integer value determined from the antenna port used for EPDCCH transmission.

5. A method comprising:

transmitting, by an evolved NodeB (Enb) downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe;

assigning a physical uplink control channel (PUCCH) resource index to a user equipment (UE) for acknowledging the PDSCH transmissions as a function of the lowest ECCE index used to construct the EPDCCH; 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,

wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of a bundling window, 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;

6. The method of claim 5 wherein, for m>

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

7. The method of claim 5, 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}.

8. The method of claim 5, wherein the PUCCH resource index is calculated further based on EPDCCH added to the number of ECCEs in EPDCCHs derived for the UE and added to an integer value determined from the antenna port used for EPDCCH transmission.

9. A non-transitory computer-readable medium including instructions that, when executed on processing circuitry of an evolved NodeB (eNB), cause the eNB to:

transmit downlink control information (DCI) on an enhanced physical downlink control channel (EPDCCH) that includes indexed enhanced control channel elements (ECCEs), the DCI to schedule a physical downlink shared channel (PDSCH) resource for a downlink subframe;

assign a physical uplink control channel (PUCCH) resource index to a user equipment (UE) for acknowledging the PDSCH transmissions as a function of the lowest ECCE index used to construct the EPDCCH; and

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,

wherein the value of the ARO field corresponds to an ARO value to shift the PUCCH resource index to a range used for acknowledging PDSCH transmissions in the earliest subframe of a bundling window, 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;

10. The non-transitory computer-readable medium of claim 9 wherein, for m>

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

11. The non-transitory computer-readable medium of claim 9 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}.

12. The non-transitory computer-readable medium of claim 9, wherein the PUCCH resource index is calculated further based on EPDCCH added to the number of ECCEs in EPDCCHs derived for the UE and added to an integer value determined from the antenna port used for EPDCCH transmission.