HYBRID AUTOMATIC REPEAT REQUEST ACKNOWLEDGE RESOURCE ALLOCATION FOR ENHANCED PHYSICAL DOWNLINK CONTROL CHANNEL

• US 20120320848A1
• Filed: 06/18/2012
• Published: 12/20/2012
• Est. Priority Date: 06/17/2011
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Chen, Runhua, Ekpenyong, Anthony
• Granted Patent: US 9,413,509 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• 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 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A method and apparatus of wireless communication between a base station and at least one user equipment. The method includes: transmitting an enhanced physical downlink control channel from the base station to the at least one user equipment using a demodulation reference signal antenna port; transmitting message from the base station to the at least one user equipment which is scheduled by the enhanced physical downlink control channel; receiving the message at the at least one user equipment; determining at the at least one user equipment whether the message was correctly received; and transmitting an ACK/NAK signal on an ACK/NAK resource determined from the enhanced physical downlink control channel from the at least one user equipment to the base station indicating whether the message was correctly received by the at least one user.

Claims

1. A method of wireless communication between a base station and at least one user equipment comprising the steps of:

transmitting an enhanced physical downlink control channel from the base station to the at least one user equipment using a demodulation reference signal antenna port;

transmitting message from the base station to the at least one user equipment which is scheduled by the enhanced physical downlink control channel;

receiving the message at the at least one user equipment;

determining at the at least one user equipment whether the message was correctly received; and

transmitting an ACK/NAK signal on an ACK/NAK resource determined from the enhanced physical downlink control channel from the at least one user equipment to the base station indicating whether the message was correctly received by the at least one user.

2. The method of claim 1, wherein:

transmitting a signal from the base station to the at least one user equipment to determine the selection of ACK/NAK resources for transmission of the ACK/NAK signal.

3. The method of claim 1, wherein:

a number of the plurality of first user equipment is greater than a number of the at least one second user equipment; and

the step of transmitting a signal to the second user equipment employing the physical uplink control channel downlink control indicator format 1a/1b/3 resource for semi-static configuration includes semi-statically configuring the user equipment with a set of four physical uplink control channel resources and dynamically indicating a currently assigned physical uplink control channel resource using a hybrid automatic repeat request acknowledge resource indicator.

4. The method of claim 1, wherein:

said step of transmitting from the at least one user equipment to the base station the ACK/NAK signal on the ACK/NAK resource indexed by a lowest-indexed control channel element for the enhanced physical downlink control channel.

5. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal further includes partitioning a dynamic physical uplink control channel into a legacy region when the user equipment is configured by higher layers to receive downlink control information on the legacy physical downlink control channel and an enhanced region wherein the user equipment is configured by higher layers to receive downlink control information on the enhanced physical uplink control channel and to use physical uplink control channel format 1a/1b for determining ARK/NAK resource as;

n_PUCCH⁽¹⁾=n_index+N_PUCCH⁽¹⁾+g(N_PUCCH,e⁽¹⁾)

where;

n_index is the respective lowest indexed physical resource block or lowest indexed control channel element;

N_PUCCH⁽¹⁾ is the cell-specific offset; and

g(N_{PUCCH, e}⁽¹⁾) is a function of a user equipment specific extended offset parameter.

6. The method of claim 5, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on the enhanced physical downlink control channel type.

7. The method of claim 5, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on the demodulation reference symbol antenna port used for transmitting the enhanced physical downlink control channel.

8. The method of claim 5, wherein:

said g(N_PUCCH,e⁽¹⁾) is defined based on the scrambling sequence identification number of the demodulation reference symbol antenna port used for transmitting the enhanced physical downlink control channel.

9. The method of claim 5, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on a cyclic redundancy check used for masking the enhanced physical downlink control channel.

10. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal further includes partitioning a dynamic physical uplink control channel into a legacy region employing cell-specific reference symbols diversity selecting 0, . . . , N_CCE,k−

1 in subframe k and an enhanced region employing an enhanced physical downlink control channel using demodulating reference signals transmission diversity, wherein the user equipment is configured by higher layers to receive downlink control information on the an enhanced physical downlink control channel wherein N_CCE,k, . . . , M_CCE,k−

1 defines the set of control channel elements corresponding to the enhanced physical downlink control channel and g(N_{PUCCH, e}⁽¹⁾)=0.

11. The method of claim 1, wherein:

said enhanced region is configured with a user equipment specific offset g(N_{PUCCH, e}⁽¹⁾)=N_{PUCCH, e}⁽¹⁾ where resource allocation is based on the lowest-indexed physical resource block for the enhanced physical downlink control channel allocation n_PRB.

12. The method of claim 11, wherein:

the ACK/NAK resource is determined from one offset g(N_{PUCCH, e}⁽¹⁾)=N_{PUCCH, e}⁽¹⁾ as;

n_PUCCH⁽¹⁾=n_index+N_PUCCH,e⁽¹⁾.

13. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal includes determining a hybrid automatic repeat request acknowledge resource as a function of the scrambling sequence on cyclic redundancy check of the corresponding enhanced physical downlink control channel;

n_PUCCH⁽¹⁾=n_CCE+N_PUCCH⁽¹⁾+N_PUCCH,e⁽¹⁾+g′

(CRC_scrambling_sequence_ID)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

N_PUCCH⁽¹⁾ is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_PUCCH,e⁽¹⁾ is a cell-specific offset which delineates the semi-static enhanced physical uplink control channel region from the dynamic enhanced physical uplink control channel downlink control indicator; and

g′

(CRC_scrambling_sequence_ID) is a function of a cyclic redundancy check scrambling sequence.

14. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal includes determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH⁽¹⁾=n_CCE+N_PUCCH⁽¹⁾+N_PUCCH,e⁽¹⁾+g′

(DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

N_PUCCH⁽¹⁾ is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_PUCCH,e⁽¹⁾ is a cell-specific offset which delineates the semi-static enhanced physical uplink control channel region from the dynamic enhanced physical uplink control channel downlink control indicator; and

g′

(DMRS_port_PDCCH) is a function of a demodulation reference signal antenna port on the physical downlink control channel.

15. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal includes determining a hybrid automatic repeat request acknowledge resource as a function of a demodulation reference signal scrambling sequence identity and as;

n_PUCCH=n_CCE+f(N_PUCCH)+g(SCID_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator; and

g(SCID_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel.

16. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal includes determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal scrambling sequence identity and a demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH=n_CCE+f(N_PUCCH)+g(SCID_PDCCH,DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator; and

g(SCID_PDCCH,DMRS_port_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel and of a demodulation reference signal antenna port on the physical downlink control channel.

17. The method of claim 16, wherein:

g(SCID_PDCCH,DMRS_port_PDCCH) is given by;

18. The method of claim 16, wherein:

g(SCID_PDCCH,DMRS_port_PDCCH) is given by;

19. The method of claim 1, wherein:

said step of transmitting from the at least on user equipment to the base station an ACK/NAK signal includes determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal scrambling sequence identity and a demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH=n_CCE+f(N_PUCCH)+N_CCE×

g(SCID_PDCCH,DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_CCE is the total number of available control channel elements for enhanced physical downlink control channel on a single antenna port with a single scrambling sequence identity without multiuser, multiple input, multiple output of enhanced physical downlink control channel; and

g(SCID_PDCCH,DMRS_port_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel and of a demodulation reference signal antenna port on the physical downlink control channel.

32. The base station of claim 1, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal including determining a hybrid automatic repeat request acknowledge resource as a function of the scrambling sequence on cyclic redundancy check of the corresponding enhanced physical downlink control channel;

n_PUCCH⁽¹⁾=n_CCE+N_PUCCH⁽¹⁾+N_PUCCH,e⁽¹⁾+g′

(CRC_scrambling_sequence_ID)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

N_PUCCH⁽¹⁾ is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_PUCCH,e⁽¹⁾ is a cell-specific offset which delineates the semi-static enhanced physical uplink control channel region from the dynamic enhanced physical uplink control channel downlink control indicator; and

g′

(CRC_scrambling_sequence_ID) is a function of a cyclic redundancy check scrambling sequence.

20. A base station in a wireless communication system comprising:

a transceiver operable to communication with at least one user equipment by respective transmitting radio frequency signals to the at least one user equipment and receiving radio frequency signals from the at least one user equipment;

a programmable digital data processor connected to said transceiver; and

a memory connected to said digital data processor storing data and at least one application program controlling operation of said programmable digital data processor, said at least one application program operable to control said programmable digital data processor to

transmit an enhanced physical downlink control channel from the base station to the at least one user equipment using a demodulation reference signal antenna port,

transmit a message from the base station to the at least one user equipment which is scheduled by the enhanced physical downlink control channel,

receive a ACK/NAK signal on a designated ACK/NAK resource, and

take a remedial action if said ACK/NAK signal indicates a non-acknowledge.

21. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to transmit a signal from the base station to the at least one user equipment to determine the selection of ACK/NAK resources for transmission of the ACK/NAK signal.

22. The base station of claim 20, wherein:

a number of the plurality of first user equipment is greater than a number of the at least one second user equipment; and

said at least one application program further operable to control said programmable digital data processor to transmit a signal to the second user equipment employing the physical uplink control channel downlink control indicator format 1a/1b/3 resource for semi-static configuration including semi-statically configuring the user equipment with a set of four physical uplink control channel resources and dynamically indicating a currently assigned physical uplink control channel resource using a hybrid automatic repeat request acknowledge resource indicator.

23. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station the ACK/NAK signal on the ACK/NAK resource indexed by a lowest-indexed control channel element for the enhanced physical downlink control channel.

24. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal further including partitioning a dynamic physical uplink control channel into a legacy region when the user equipment is configured by higher layers to receive downlink control information on the legacy physical downlink control channel and an enhanced region wherein the user equipment is configured by higher layers to receive downlink control information on the enhanced physical uplink control channel and to use physical uplink control channel format 1a/1b for determining ARK/NAK resource as;

n_PUCCH⁽¹⁾=n_index+N_PUCCH⁽¹⁾+g(N_PUCCH,e⁽¹⁾)

where;

n_index is the respective lowest indexed physical resource block or lowest indexed control channel element;

N_PUCCH⁽¹⁾ is the cell-specific offset; and

g(N_{PUCCH, e}⁽¹⁾) is a function of a user equipment specific extended offset parameter.

26. The base station of claim 24, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on the demodulation reference symbol antenna port used for transmitting the enhanced physical downlink control channel.

27. The base station of claim 24, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on the scrambling sequence identification number of the demodulation reference symbol antenna port used for transmitting the enhanced physical downlink control channel.

28. The base station of claim 24, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on a cyclic redundancy check used for masking the enhanced physical downlink control channel.

29. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to partition a dynamic physical uplink control channel into a legacy region employing cell-specific reference symbols diversity selecting 0, . . . , N_CCE,k−

1 in subframe k and an enhanced region employing an enhanced physical downlink control channel using demodulating reference signals transmission diversity, wherein the user equipment is configured by higher layers to receive downlink control information on the an enhanced physical downlink control channel wherein N_CCE,k, . . . , M_CCE,k−

1 defines the set of control channel elements corresponding to the enhanced physical downlink control channel and g(N_{PUCCH, e}⁽¹⁾)=0.

30. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to configure an enhanced region with a user equipment specific offset g(N_{PUCCH, e}⁽¹⁾)=N_{PUCCH, e}⁽¹⁾ where resource allocation is based on the lowest-indexed physical resource block for the enhanced physical downlink control channel allocation n_PRB.

31. The base station of claim 30, wherein:

the ACK/NAK resource is determined from one offset g(N_{PUCCH, e}⁽¹⁾)=N_{PUCCH, e}⁽¹⁾ as;

n_PUCCH⁽¹⁾=n_index+N_PUCCH,e⁽¹⁾.

33. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal including determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH⁽¹⁾=n_CCE+N_PUCCH⁽¹⁾+N_PUCCH,e⁽¹⁾+g′

(DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

N_PUCCH⁽¹⁾ is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_PUCCH,e⁽¹⁾ is a cell-specific offset which delineates the semi-static enhanced physical uplink control channel region from the dynamic enhanced physical uplink control channel downlink control indicator; and

g′

(DMRS_port_PDCCH) is a function of a demodulation reference signal antenna port on the physical downlink control channel.

34. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal including determining a hybrid automatic repeat request acknowledge resource as a function of a demodulation reference signal scrambling sequence identity and as;

n_PUCCH=n_CCE+f(N_PUCCH)+g(SCID_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator; and

g(SCID_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel.

35. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal including determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal scrambling sequence identity and a demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH=n_CCE+f(N_PUCCH)+g(SCID_PDCCH,DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator; and

g(SCID_PDCCH,DMRS_port_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel and of a demodulation reference signal antenna port on the physical downlink control channel.

36. The base station of claim 35, wherein:

g(SCID_PDCCH,DMRS_port_PDCCH) is given by;

37. The base station of claim 35, wherein:

g(SCID_PDCCH,DMRS_port_PDCCH) is given by;

38. The base station of claim 20, wherein:

said at least one application program further operable to control said programmable digital data processor to receive at the base station an ACK/NAK signal including determining a hybrid automatic repeat request acknowledge resource as a function of the demodulation reference signal scrambling sequence identity and a demodulation reference signal antenna port of the corresponding enhanced physical downlink control channel downlink grant;

n_PUCCH=n_CCE+f(N_PUCCH)+N_CCE×

g(SCID_PDCCH,DMRS_port_PDCCH)

where;

n_CCE is the index of the lowest control channel elements in the corresponding physical downlink control channel;

f(N_PUCCH) is a cell-specific offset which delineates the semi-static physical uplink control channel region from the dynamic physical uplink control channel downlink control indicator;

N_CCE is the total number of available control channel elements for enhanced physical downlink control channel on a single antenna port with a single scrambling sequence identity without multiuser, multiple input, multiple output of enhanced physical downlink control channel; and

g(SCID_PDCCH,DMRS_port_PDCCH) is a function of a demodulation reference signal scrambling sequence identity on the physical downlink control channel and of a demodulation reference signal antenna port on the physical downlink control channel.

25. The base station of claim 25, wherein:

said g(N_{PUCCH, e}⁽¹⁾) is defined based on the enhanced physical downlink control channel type.