Scheduling timing design for a TDD system

• US 9,686,089 B2
• Filed: 12/17/2012
• Issued: 06/20/2017
• Est. Priority Date: 03/16/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: He, Hong, Fwu, Jong-Kae, Huang, Rui
• Primary Examiner(s): Soe, Kyaw Z
• Application Number:
  US13/716,978
• Publication Number:
  US 20130242819A1
• Time in Patent Office: 1,646 Days
• Field of Search: 370280
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 12/2854 Wide area networks, e.g. public data networks
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/6275 based on priority
• CPC Class Codes: H04L 5/001 : the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 : Allocation of signaling, i.e. of overhead other than pilot signals
• 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 5/0073 : Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/14 : Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1438 : Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 5/1446 : of transmission speed
• CPC Class Codes: H04L 5/1469 : using time-sharing
• CPC Class Codes: H04L 65/75 : Media network packet handling
• CPC Class Codes: H04L 65/752 : adapting media to network capabilities
• CPC Class Codes: H04L 65/756 : adapting media to device capabilities
• CPC Class Codes: H04L 67/02 : based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/568 : Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04N 21/25841 : involving the geographical location of the client retrieval from the Internet by querying based on geographical locations G06F16/9537; arrangements for identifying locations of receiving stations in broadcast systems H04H60/51; location of the user terminal in data switching networks H04L67/52; services making use of the location of users or terminals in wireless networks H04W4/02; locating users or terminals in wireless networks H04W64/00
• CPC Class Codes: H04N 21/41407 : embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/6405 : Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/6408 : Unicasting
• CPC Class Codes: H04W 16/04 : Traffic adaptive resource partitioning
• CPC Class Codes: H04W 24/00 : Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 : Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/0236 : radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/0268 : using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 28/0278 : using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 4/06 : Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 52/02 : Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: H04W 52/0206 : in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0209 : in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0229 : where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0235 : where the received signal is a power saving command
• CPC Class Codes: H04W 52/143 : Downlink power control
• CPC Class Codes: H04W 52/243 : taking into account interferences
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/1268 : of uplink data flows
• CPC Class Codes: H04W 72/1273 : of downlink data flows
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• 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
• CPC Class Codes: H04W 72/27 : between access points
• CPC Class Codes: H04W 72/51 : based on terminal or device properties
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 72/569 : of the traffic information
• CPC Class Codes: H04W 74/085 : collision avoidance
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Disclosed is a method of transmitting, from an enhanced Node B (eNB), an indication of an uplink/downlink (UL-DL) subframe configuration of a scheduling cell and a scheduled cell in a wireless time-division duplex (TDD) system. Embodiments include identifying the type of the UL-DL subframe configuration of the scheduling cell and determining a UL-DL subframe configuration to use for UL resource allocation of the scheduled cell. Other embodiments include identifying a reference UL-DL subframe configuration to use for UL resource allocation of the scheduled cell.

Claims

1. A system comprising:

a receiver to receive, at a user equipment (UE), an indication of an uplink/downlink (UL-DL) subframe configuration of a scheduling cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling;

the receiver further to receive an indication of a UL-DL subframe configuration of a scheduled cell in the wireless TDD system that utilizes the cross-carrier scheduling, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell, wherein transmission on a component carrier (CC) of the scheduled cell is based on a resource allocation received on a CC of the scheduling cell; and

a processor to identify a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and scheduled cell; and

wherein the receiver is further to receive, from the scheduling cell of an enhanced NodeB (eNB), a hybrid automatic repeat request (HARQ) signal of the scheduled cell according to a subframe timing of the reference UL-DL subframe configuration;

wherein;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 1 and the UL-DL subframe configuration of the scheduled cell is equal to 2, 4, or 5;

the reference UL-DL subframe configuration is equal to 2 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 3 and the UL-DL subframe configuration of the scheduled cell is equal to 4 or 5; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 5.

2. The system of claim 1, wherein:

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 1, 2, 3, or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 6;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 3 or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 0; and

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 1.

3. The system of claim 1, wherein:

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 3; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

4. The system of claim 1, wherein:

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 0;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 1, 2, or 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 3;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 0 and the UL-DL subframe configuration of the scheduled cell is equal to 6; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

5. The system of claim 1, wherein the scheduling cell is a primary service cell or a secondary serving cell;

and

wherein the scheduled cell is a secondary serving cell.

6. The system of claim 1, wherein the receiver is further to receive an identification of the reference UL-DL subframe configuration via one or more radio resource control (RRC) signals.

7. The system of claim 1, wherein the processor is further to identify the reference UL-DL subframe configuration via a table stored in a memory of the UE.

8. The system of claim 1, wherein at least one of the UL-DL subframe configuration of the scheduled cell, the UL-DL subframe configuration of the scheduling cell, and the reference UL-DL subframe configuration correspond to one of TDD UL-DL configurations 0-6 associated with 3^rd Generation Partnership Project'"'"'s (3GPP'"'"'s) long-term evolution (LTE) advanced wireless communication standard;

and

wherein the system is a mobile phone, a netbook, a laptop, an electronic tablet, or a data system of a vehicle.

9. The system of claim 1, wherein the reference UL-DL subframe configuration is different from the UL-DL subframe configuration of either the scheduling cell or the scheduled cell.

10. The system of claim 1, wherein the receiver is further to receive the HARQ signal of the scheduled cell in a downlink subframe of the scheduling cell;

and

wherein the HARQ signal comprises a positive or negative acknowledgement signal.

16. The system of claim 1, wherein the indication of the UL-DL subframe configuration of the scheduling cell is received in a system information block of a signal of the scheduling cell.

11. An enhanced NodeB (eNB) comprising:

a processor to;

determine respective uplink/downlink (UL-DL) subframe configurations of a scheduling cell and a scheduled cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell, wherein transmission on a component carrier (CC) of the scheduled cell is based on a resource allocation received on a CC of the scheduling cell; and

determine a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and the scheduled cell; and

a transmitter to transmit to a user equipment (UE);

an indication of the UL-DL subframe configuration of the scheduling cell;

an indication of the UL-DL subframe configuration of the scheduled cell; and

an indication of the reference UL-DL subframe configuration;

wherein the transmitter is further to transmit a hybrid automatic repeat request (HARQ) signal comprising a positive or negative acknowledgement signal of the scheduled cell in a downlink subframe of the scheduling cell; and

wherein;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 1, 2, 3, or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 6;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 3 or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 0; and

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 1.

12. The eNB of claim 11, wherein the indication of the reference UL-DL subframe configuration is transmitted in radio resource control (RRC) signaling.

13. The eNB of claim 11, wherein the scheduling cell is a primary service cell or a secondary serving cell;

and

wherein the scheduled cell is a secondary serving cell.

14. The eNB of claim 11, wherein at least one of the UL-DL subframe configuration of the scheduled cell, the UL-DL subframe configuration of the scheduling cell, and the reference UL-DL subframe configuration are one of TDD UL-DL configurations 0-6 associated with 3^rd Generation Partnership Project'"'"'s (3GPP'"'"'s) long-term evolution (LTE) advanced wireless communication standard.

15. The eNB of claim 11, wherein:

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 1 and the UL-DL subframe configuration of the scheduled cell is equal to 2, 4, or 5;

the reference UL-DL subframe configuration is equal to 2 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 3 and the UL-DL subframe configuration of the scheduled cell is equal to 4 or 5;

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 3;

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 4;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 0;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 1, 2, or 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 3;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 0 and the UL-DL subframe configuration of the scheduled cell is equal to 6; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

17. One or more non-transitory computer-readable media comprising instructions to cause a user equipment (UE), upon execution of the instructions by one or more processors of the UE, to:

receive an indication of an uplink/downlink (UL-DL) subframe configuration of a scheduling cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling;

receive an indication of a UL-DL subframe configuration of a scheduled cell in the wireless TDD system that utilizes the cross-carrier scheduling, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell, wherein transmission on a component carrier (CC) of the scheduled cell is based on a resource allocation received on a CC of the scheduling cell;

identify a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and scheduled cell; and

receive, from the scheduling cell of an enhanced NodeB (eNB), a hybrid automatic repeat request (HARD) signal of the scheduled cell according to a subframe timing of the reference UL-DL subframe configuration;

wherein;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 3; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

18. The one or more non-transitory computer-readable media of claim 17, wherein:

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 1 and the UL-DL subframe configuration of the scheduled cell is equal to 2, 4, or 5;

the reference UL-DL subframe configuration is equal to 2 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 3 and the UL-DL subframe configuration of the scheduled cell is equal to 4 or 5; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 5.

19. The one or more non-transitory computer-readable media of claim 17, wherein:

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 1, 2, 3, or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 6;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 3 or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 0; and

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 1.

20. The one or more non-transitory computer-readable media of claim 17, wherein the indication of the UL-DL subframe configuration of the scheduling cell is received in a system information block of a signal of the scheduling cell.

21. The one or more non-transitory computer-readable media of claim 17, wherein:

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 0;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 1, 2, or 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 3;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 0 and the UL-DL subframe configuration of the scheduled cell is equal to 6; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

22. The one or more non-transitory computer-readable media of claim 17, wherein the scheduling cell is a primary service cell or a secondary serving cell;

and

wherein the scheduled cell is a secondary serving cell.

23. The one or more non-transitory computer-readable media of claim 17, wherein the instructions are further to receive an identification of the reference UL-DL subframe configuration via one or more radio resource control (RRC) signals.

24. The one or more non-transitory computer-readable media of claim 17, wherein the instructions are further to identify the reference UL-DL subframe configuration via a table stored in a memory of the UE.

25. The one or more non-transitory computer-readable media of claim 17, wherein at least one of the UL-DL subframe configuration of the scheduled cell, the UL-DL subframe configuration of the scheduling cell, and the reference UL-DL subframe configuration correspond to one of TDD UL-DL configurations 0-6 associated with 3rd Generation Partnership Project'"'"'s (3GPP'"'"'s) long-term evolution (LTE) advanced wireless communication standard;

and

wherein the system is a mobile phone, a netbook, a laptop, an electronic tablet, or a data system of a vehicle.

26. The one or more non-transitory computer-readable media of claim 17, wherein the reference UL-DL subframe configuration is different from the UL-DL subframe configuration of either the scheduling cell or the scheduled cell.

27. The one or more non-transitory computer-readable media of claim 17, wherein a receiver is further to receive the HARQ signal of the scheduled cell in a downlink subframe of the scheduling cell;

and

wherein the HARQ signal comprises a positive or negative acknowledgement signal.

28. One or more non-transitory computer-readable media comprising instructions to cause an enhanced NodeB (eNB), upon execution of the instructions by one or more processors of the eNB, to:

determine respective uplink/downlink (UL-DL) subframe configurations of a scheduling cell and a scheduled cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell, wherein transmission on a component carrier (CC) of the scheduled cell is based on a resource allocation received on a CC of the scheduling cell;

determine a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and the scheduled cell;

transmit, to a user equipment (UE), an indication of the UL-DL subframe configuration of the scheduling cell, an indication of the UL-DL subframe configuration of the scheduled cell, and an indication of the reference UL-DL subframe configuration; and

transmit a hybrid automatic repeat request (HARQ) signal comprising a positive or negative acknowledgement signal of the scheduled cell in a downlink subframe of the scheduling cell;

wherein;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 0;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 1, 2, or 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 0 or 6, and the UL-DL subframe configuration of the scheduled cell is equal to 3;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 0 and the UL-DL subframe configuration of the scheduled cell is equal to 6; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 6 and the UL-DL subframe configuration of the scheduled cell is equal to 4.

29. The one or more non-transitory computer-readable media of claim 28, wherein the indication of the reference UL-DL subframe configuration is transmitted in radio resource control (RRC) signaling.

30. The one or more non-transitory computer-readable media of claim 28, wherein the scheduling cell is a primary service cell or a secondary serving cell;

and

wherein the scheduled cell is a secondary serving cell.

31. The one or more non-transitory computer-readable media of claim 28, wherein at least one of the UL-DL subframe configuration of the scheduled cell, the UL-DL subframe configuration of the scheduling cell, and the reference UL-DL subframe configuration are one of TDD UL-DL configurations 0-6 associated with 3rd Generation Partnership Project'"'"'s (3GPP'"'"'s) long-term evolution (LTE) advanced wireless communication standard.

32. The one or more non-transitory computer-readable media of claim 28, wherein:

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 1 and the UL-DL subframe configuration of the scheduled cell is equal to 2, 4, or 5;

the reference UL-DL subframe configuration is equal to 2 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 3 and the UL-DL subframe configuration of the scheduled cell is equal to 4 or 5;

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 5;

the reference UL-DL subframe configuration is equal to 6 if the UL-DL subframe configuration of the scheduling cell is equal to 1, 2, 3, or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 6;

the reference UL-DL subframe configuration is equal to 0 if the UL-DL subframe configuration of the scheduling cell is equal to 3 or 4, and the UL-DL subframe configuration of the scheduled cell is equal to 0;

the reference UL-DL subframe configuration is equal to 1 if the UL-DL subframe configuration of the scheduling cell is equal to 4 and the UL-DL subframe configuration of the scheduled cell is equal to 1;

the reference UL-DL subframe configuration is equal to 3 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 3; and

the reference UL-DL subframe configuration is equal to 4 if the UL-DL subframe configuration of the scheduling cell is equal to 2 and the UL-DL subframe configuration of the scheduled cell is equal to 4.