US20220158802A1 - Efficient allocation of uplink harq-ack resources for lte enhanced control channel - Google Patents
Efficient allocation of uplink harq-ack resources for lte enhanced control channel Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1614—Details of the supervisory signal using bitmaps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
Definitions
- LTE Long-Term Evolution
- Enhancements in LTE Release 10 and Release 11 such as improved Downlink (DL) and Uplink (UL) Multi-User Multiple-Input/Multiple-Output (MU-MIMO), DL and UL Coordinated Multipoint Transmission (CoMP)—either with unique physical cell IDs or a shared physical cell ID scenario—and new carrier types for Carrier Aggregation (CA), put a heavy burden on legacy DL control channel capacity.
- the interference from a macro base station as experienced by User Equipment (UE) within the cell range expansion region of a low power node may prevent successful decoding of DL control signals.
- an Enhanced Physical Downlink Control Channel is included for LTE Release 11, where some of the objectives of the EPDCCH include increased control channel capacity, the ability to support frequency domain inter-cell interference control, improved spatial reuse of control channel resources and support of beamforming on the control channel.
- Embodiments of the invention provide systems and methods for selecting Physical Uplink Control Channel (PUCCH) resources.
- An Enhanced Physical Downlink Control Channel (EPDCCH) is detected in signals received from a base station in a first subframe.
- a HARQ-ACK resource indicator offset ( ⁇ ARO) value is identified for the EPDCCH.
- a PUCCH resource is selected for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) corresponding to the EPDCCH.
- the PUCCH resource is selected based upon the ⁇ ARO value.
- a second PUCCH resource may be selected for transmission of the HARQ-ACK on a second antenna port.
- the ⁇ ARO field in the EPDCCH may alternatively indicate one out of a set of semi-statically configured PUCCH resources.
- a HARQ-ACK resource offset field value may be detected in a Downlink Control Information (DCI) format of the EPDCCH.
- DCI Downlink Control Information
- the ⁇ ARO value for the EPDCCH can be identified by looking up the HARQ-ACK resource offset field value in a table that maps the HARQ-ACK resource offset field value for certain DCI formats to ⁇ ARO values.
- the HARQ-ACK resource offset field value may be a two-bit field in a DCI payload.
- the two-bit field may correspond to ⁇ ARO values in the range ⁇ 0, ⁇ 1, ⁇ 2, 2 ⁇ .
- the HARQ-ACK resource offset field in the DCI format of the EPDCCH may be used to indicate a small offset or a large offset.
- a user equipment device comprises a receiver processor circuit that is configured to detect an Enhanced Physical Downlink Control Channel (EPDCCH) in signals received from a base station in a subframe n.
- the user equipment device further comprises a transmit processor circuit configured to select a Physical Uplink Control Channel (PUCCH) resource for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) to the base station in a subframe n+k, where k ⁇ 4 and the PUCCH resource is selected based upon a HARQ-ACK resource offset.
- the user equipment device further comprises a modem configured to transmit the PUCCH resource to the base station.
- the transmit processor circuit may be further configured to select a second PUCCH resource for transmission of the HARQ-ACK on a second antenna port.
- FIG. 1 illustrates the EPDCCH blocking probability taking into account PUCCH resource blocking between two EPDCCH sets for the case where there is no ARO.
- FIG. 3 is a chart illustrating a comparison of the blocking probability in a lightly loaded system consisting of four UEs.
- FIG. 4 is a chart illustrating a comparison of the PUCCH utilization for the lightly loaded system shown in FIG. 3 .
- FIG. 5 is a chart illustrating a comparison of the blocking probability in a heavily loaded system consisting of fourteen UEs.
- FIG. 6 is a chart illustrating a comparison of the PUCCH utilization for the heavily loaded system shown in FIG. 5 .
- FIG. 7 is a block diagram of a wireless communication network according to one embodiment.
- FIG. 8 is a high level block diagram of a system that may be used as an eNB or UE according to one embodiment.
- FIG. 9 illustrates EPDCCH-based PUCCH resource allocation according to one embodiment.
- FIG. 10 is a block diagram illustrating the use of a small ⁇ ARO value within one PUCCH resource allocation block.
- FIG. 11 is a block diagram illustrating the use of a large ⁇ ARO value to move from one PUCCH resource allocation block to another.
- FIG. 12 block diagram illustrating a modification wherein UE resource allocations are moved beyond adjacent blocks.
- An Enhanced Physical Downlink Control Channel (EPDCCH) is introduced in LTE Release 11.
- Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) resources on a Physical Uplink Control Channel (PUCCH) need to be determined in response to a Physical Downlink Shared Channel (PDSCH) transmission that is scheduled by either the Physical Downlink Control Channel (PDCCH) or the EPDCCH.
- HARQ-ACK Hybrid Automatic Repeat reQuest-ACKnowledgement
- the dynamic PUCCH resource is given by the expression:
- n PUCCH (1) n CCE +N PUCCH (1) Eq. (1)
- N PUCCH (1) is a dynamic PUCCH offset parameter that delineates a dynamic PUCCH region from a semi-static PUCCH region and is either common for the entire cell (cell-specific) or dedicated to a particular UE (UE-specific).
- the parameter n CCE denotes the first, or lowest-indexed, control channel element used for the PDCCH that schedules a corresponding Downlink Shared Channel (DL-SCH) data transmission on the PDSCH.
- EPDCCH For EPDCCH, it has been agreed that the EPDCCH region is configured in a dedicated manner for a UE.
- a UE can be configured with up to two EPDCCH sets to form a UE-specific search space for receiving downlink control information.
- Each set may contain ⁇ 2, 4, 8 ⁇ Physical Resource Block (PRB) pairs and each set consists of a number of enhanced Control Channel Elements (ECCEs).
- PRB Physical Resource Block
- ECCEs are indexed per EPDCCH set.
- One or more ECCEs are aggregated for transmitting a Downlink Control Information (DCI) message on the EPDCCH.
- DCI Downlink Control Information
- the dynamic PUCCH resource allocation is defined per EPDCCH set and is modified from equation (1) to
- n PUCCH (1) ⁇ ( n eCCE )+ N PUCCH-UE,k (1) + ⁇ ARO Eq. (2)
- the ⁇ (n eCCE ) term is a function of the lowest-indexed ECCE in EPDCCH set k that is used to construct the transmitted EPDCCH.
- the N PUCCH-UE,k (1) term is a semi-statically configured dedicated PUCCH resource starting offset for EPDCCH set k.
- ⁇ ARO is a dynamically signaled HARQ-ACK resource indicator offset that can be used to resolve collisions between PUCCH resources from PDCCH and an EPDCCH set. It can also be used to resolve collisions between PUCCH resources associated with two EPDCCH sets.
- the PUCCH regions corresponding to PDCCH and EPDCCH DL assignments can be mapped to non-overlapping PUCCH regions. This partitioning avoids possible collisions between PUCCH resources derived from PDCCH and EPDCCH DL assignments. On the other hand, creating non-overlapping regions is not an efficient use of UL resources because it limits the uplink frequency resources that are available for Uplink Shared Channel (UL-SCH) data transmission on the Physical Uplink Shared Channel (PUSCH).
- UL-SCH Uplink Shared Channel
- a 2-bit ARO field is defined with values [ ⁇ , 0, ⁇ , 2 ⁇ ], where ⁇ is the unit offset value.
- the ARO described herein is conveyed in a new field in a DCI format scheduling a DL assignment on the PDSCH. If a UE receives a value of ‘0’ it indicates that no offset is applied in determining the PUCCH resource of equation (2).
- FIG. 1 illustrates the EPDCCH blocking probability taking into account PUCCH resource blocking between two EPDCCH sets for the case where there is no ARO.
- the different curves in FIG. 1 show different levels of overlap in the PUCCH regions associated with the two EPDCCH sets.
- the ARO reduces the overall blocking probability
- the ARO also introduces some limitations. For example, if a UE is configured to receive PDSCH on a secondary serving cell (SCell) in carrier aggregation, the UE is also configured to transmit HARQ-ACK feedback using either PUCCH format 1b with channel selection or PUCCH format 3.
- PUCCH format 1b the PUCCH resource(s) corresponding to a detected data transmission on the PDSCH on a SCell is indicated by a HARQ-ACK Resource Indicator (ARI) value that is conveyed in the Transmit Power Control (TPC) field of the DCI that schedules the PDSCH.
- ARI HARQ-ACK Resource Indicator
- embodiments of the present invention include the following options for the ARO field, namely: (1) the ARO field is not configured in the DCI format, (2) the ARO field is configured in the DCI format with redundant information, or (3) designating the ARO field as reserved when the DCI is transmitted on an EPDCCH scheduling PDSCH on a SCell.
- an explicit ARO field is introduced for all DCI formats that are transmitted on the EPDCCH—except for DCI format 4, which is used to schedule UL MIMO transmission.
- a UE receives a PDSCH transmission indicated by detection of a DL assignment on the EPDCCH or an EPDCCH indicating downlink Semi Persistent Scheduling (SPS) release on the primary cell, the UE decodes the EPDCCH with an explicit 2-bit ARO field in the DCI payload.
- SPS Semi Persistent Scheduling
- the ARO field value indicates a resource offset ( ⁇ ARO ) in the range ⁇ 2, 0, 2, 4 ⁇ .
- the range may be ⁇ 1, 0, 1, 3 ⁇ or ⁇ 2.
- ⁇ 1, 0, 2 ⁇ the main idea taught here is that small offset values are defined to resolve PUCCH resource collisions.
- Tables 1 and 2 illustrate alternative ⁇ ARO mappings for values in the ARO field in DCI format.
- the resource offset range may be configured based on whether the UE is configured for transmit diversity on PUCCH format 1a/1b.
- the ARO field indicates an offset in the range ⁇ 2, 0, 2, 4 ⁇ .
- the ARO field indicates an offset in the range ⁇ 1, 0, 1, 2 ⁇ or in the range ⁇ 0, 1, 2, 3 ⁇ .
- Time-Division Duplex (TDD) UE that is configured for PUCCH format 3 and an EPDCCH is detected with the value of the downlink assignment index (DAI) greater than 1 in the DCI message; or
- an explicit ARO field may be used to indicate a semi-statically configured resource, such as one out of a set of four semi-statically configured resources.
- the TPC field of the DCI format may be re-interpreted as the ARI value when a UE detects a PDCCH scheduling PDSCH on a SCell. Additionally, when a TDD UE that is configured for single cell operation is configured for PUCCH format 3, the TPC field of the DCI format scheduling PDSCH may be used to indicate the ARI if the Downlink Assignment Index (DAI) value is greater than 1. This embodiment restores the TPC field to its original function of providing TPC commands instead of indicating an ARI value.
- DAI Downlink Assignment Index
- the TPC field indicates transmit power control commands and the HARQ-ACK resource offset (ARO) field indicates one out of a set of up to four semi-statically configured PUCCH format 3 resources.
- ARO HARQ-ACK resource offset
- the TPC field of the EPDCCH may indicate one out of a set of up to four semi-statically configured PUCCH format 3 resources.
- the ARO field of the EPDCCH may be set to zero or may be reserved (i.e., the value is undefined).
- both the TPC field and the ARO field of the EPDCCH may indicate the same PUCCH format 3 resource out of the set of up to four semi-statically configured PUCCH format 3 resources.
- the TPC field may indicate the TPC command, while the ARO field indicates one PUCCH format 3 resource out of the set of up to four semi-statically configured PUCCH format 3 resources. If a UE detects in the same subframe an EPDCCH on the primary cell scheduling PDSCH on the primary cell and another EPDCCH on the primary cell scheduling PDSCH on a secondary cell, the same TPC value is transmitted on both EPDCCHs.
- the TPC field and ARO field may both indicate the same ARI value for selecting a PUCCH format 3 resource.
- an explicit ARO field is inserted only in DCI formats carried in EPDCCH on the primary cell.
- the UE decodes the EPDCCH on the primary cell assuming the presence of the ARO field. For EPDCCH on a secondary cell, there is no explicit ARO field.
- TDD dynamic PUCCH resource allocation corresponding to a detected EPDCCH is similar to FDD with one important exception.
- the UE may need to send HARQ-ACK feedback in an UL subframe corresponding to PDSCH received in multiple DL subframes.
- PUCCH resources must be reserved for each DL subframe of a length-M HARQ-ACK bundling window.
- the HARQ-ACK bundling window is also known as the DL association set.
- the length M of the DL association set depends on the TDD UL/DL configuration and the UL subframe.
- the PUCCH resource regions for EPDCCH scheduling are sequentially allocated for each subframe of the HARQ-ACK DL association set of length M.
- the PUCCH region is offset by the total number of ECCEs in all preceding subframes 0, . . . , i ⁇ 1. If there are N eCCE,q,m ECCEs in EPDCCH set q for the subframe n ⁇ k m , an equal number of N eCCE,q,m PUCCH resources are reserved in UL subframe n for PDSCH transmitted in subframe n ⁇ k m .
- the dynamic PUCCH resource allocation corresponding to subframe n ⁇ k m for antenna port p0 is given by:
- ⁇ f ⁇ ( n eCCE , q , m ) ⁇ ⁇ n eCCE , q , m / N eCCE , q RB ⁇ * N eCCE , q RB + k p ⁇ ⁇ 0 localized ⁇ ⁇ EPDCCH n eCCE , q m distributed ⁇ ⁇ EPDCCH , Eq . ⁇ ( 3 )
- N eCCE,q RB is the number of ECCEs in a resource block for EPDCCH set q.
- the ARO field size may be set to 3 bits in order to support both collision avoidance and PUCCH resource compression.
- Table 3 illustrates an exemplary mapping of the ARO field value in the DCI format to the PUCCH resource in Equation 3 above.
- the last four entries offset the PUCCH resource for the i th DL subframe by the number of ECCEs in subframe i ⁇ 1 of EPDCCH set q. These entries retain resource collision avoidance capability as in FDD by further offsetting by the values ⁇ 2, 0, 1, 2 ⁇ .
- a different mapping of ARO values consisting of a mix of resource compression and collision avoidance, may also be used in other embodiments.
- the last four entries offset the resource allocation by the number of ECCEs allocated to set q in one or more previous DL subframes.
- TDD PUCCH resource compression reduces the resource collision avoidance capability if the ARO field size is unchanged with respect to FDD. If this is deemed acceptable in order to keep the same ARO field size in DCI formats for both duplex modes, the following set of values may be used in various options.
- this set reverts back to the same one for FDD, i.e. ⁇ 0, 2, ⁇ 1, ⁇ 2 ⁇ , whereas for i>1, resource compression of one DL subframe is possible.
- this set reverts back to the same one for FDD, i.e. ⁇ 0, 2, ⁇ 1, ⁇ 2 ⁇ , whereas for i>1, resource compression of one DL subframe is possible.
- the ARO set may be defined as
- both small offsets and large offsets can be designed for the ARO field.
- the small offsets are used to resolve PUCCH resource collisions between assignments in two EPDCCH sets or between an EPDCCH set and PDCCH-based resource allocation.
- the large offset on the other hand, is used to compress PUCCH resource by moving from one reserved block to another.
- FIG. 3 is a chart illustrating a comparison of the blocking probability given two EPDCCH sets, TDD UL/DL Configuration #2 and a lightly loaded system consisting of four UEs.
- FIG. 4 is a chart illustrating a comparison of the PUCCH utilization for the lightly loaded system shown in FIG. 3 .
- FIG. 5 is a chart illustrating a comparison of the blocking probability given two EPDCCH sets, TDD UL/DL Configuration #2 and a heavily loaded system consisting of fourteen UEs.
- FIG. 6 is a chart illustrating a comparison of the PUCCH utilization for the heavily loaded system shown in FIG. 5 .
- FIGS. 3-6 compare options 1, 2, and 3 as described above. As a baseline, the results with no ARO and results using an FDD ARO set of ⁇ 0, 2, ⁇ 1, ⁇ 2 ⁇ are included in the comparisons.
- FIGS. 3 and 5 show the blocking probability for each scheduled DL subframe assuming all UEs are scheduled in each subframe of the bundling window.
- FIGS. 4 and 6 show the PUCCH utilization for each PUCCH sub-region corresponding to each of the scheduled DL subframes.
- the comparison results illustrated in FIGS. 3-6 can be summarized as follows.
- all ARO options (including the FDD ARO set) achieve the intended goal of reducing the blocking probability with respect to no ARO indication. Accordingly, one PUCCH sub-region can be saved for all three options for combining resource compression with collision avoidance. In one embodiment, options 1 and 2 achieve the best PUCCH utilization. For sixteen ECCEs in an EPDCCH set, this translates to roughly one PRB (assuming that the eNB allocates eighteen format 1a/1b resources in one PRB).
- FIG. 5 also indicates that the blocking probability is low for Option 3 because, for each DL subframe, more degrees of freedom are used for resource compression to the detriment of collision avoidance. In contrast, Options 1 and 2 appear to efficiently utilize the degrees of freedom to provide both resource compression and collision avoidance capabilities.
- An LTE Release 11 UE can be configured to monitor the EPDCCH on a subset of all possible DL and special subframes.
- the UE When the UE is not configured to monitor EPDCCH in a subframe, it monitors the legacy PDCCH for DL assignments including PDCCH indicating SPS release and UL grants. It may occur that in the same DL association set of length M>1, the UE may be configured to monitor EPDCCH in some subframes and PDCCH in the other subframes. For such scenarios the PUCCH resource allocation needs to be specified.
- the PUCCH resource for antenna port p0 is
- n PUCCH , m ( 1 , p ⁇ 0 ) f ⁇ ( n eCCE , q , m ) + N PUCCH ⁇ - ⁇ UE , q ( 1 ) + ⁇ m ′ ⁇ S ( m ) ⁇ N eCCE , q , m ′ + ⁇ ARO ⁇ 0 ⁇ m ⁇ M - 1
- S (m) is the subset of DL subframes in the DL association set ⁇ n ⁇ k 0 , n ⁇ k 1 , . . . , n ⁇ k m-1 ⁇ for which the UE is configured to monitor the EPDCCH.
- This TDD resource allocation implies that if a UE is configured to monitor EPDCCH in all MDL subframes of a DL association set, then
- ⁇ m 0 M - 1 ⁇ N eCCE , q , m
- PUCCH resources shall be reserved for set q. The worst case occurs for TDD UL-DL configuration 5 with nine DL subframes and one UL subframe.
- FIG. 7 is a block diagram of a wireless communication network 700 , which may be an LTE network that utilizes orthogonal frequency-division multiple access (OFDMA) on the downlink and single-carrier frequency division multiple access (SC-FDMA) on the uplink.
- LTE partitions system bandwidth into multiple orthogonal subcarriers, which may be referred to as frequency tones or frequency bins. Each subcarrier may be modulated with data, control, or reference signals.
- the wireless network 700 includes a number of evolved Node Bs (eNBs) 701 and other network entities.
- the eNBs 701 communicate with user equipment devices (UEs) 702 , 705 .
- Each eNB 701 provides communication services for a particular geographic area or “cell” 703 .
- eNB 701 may be a macro base station, micro base station, pico base station, or femto base station, for example.
- a network controller 704 may be coupled to a set of eNBs 701 and provide coordination and control for these eNBs 701 .
- UEs 702 , 705 may be stationary or mobile and may be located throughout the wireless network 700 .
- UEs 702 , 705 may be referred to as a terminal, a mobile station, a subscriber unit, a station, such as a mobile telephone, a personal digital assistant (PDA), a wireless modem, a laptop or notebook computer, a tablet, and the like.
- a UE 702 communicates with an eNB 701 serving the cell 703 in which the UE 702 is located.
- a UE 702 may communicate with more than one eNB 701 if the cells 703 of the eNBs 701 overlap.
- One eNB 701 will be the primary cell (PCell) and the other eNBs 701 will be secondary serving cells (SCell).
- PCell primary cell
- SCell secondary serving cells
- FIG. 8 is a high level block diagram of a system 800 that may be used as an eNB or UE, which may be, for example, eNB 701 or UE 702 in FIG. 7 .
- System 800 receives data to be transmitted from an interface 801 at transmit processor 802 .
- the data may include, for example, audio or video information or other data file information to be transmitted on a PUSCH.
- the transmit processor 802 may also receive control or HARQ-ACK information to be transmitted on a PUCCH, PUSCH, or SRS, from a controller 803 .
- Transmit processor 802 processes (e.g., encode and symbol map) the data and control information to obtain data symbols, control symbols, and reference symbols.
- the transmit processor 802 may also perform spatial processing or precoding on the data symbols and/or the control symbols and reference symbols.
- the output of the transmit processor 802 is provided to a modem 804 .
- Modem 804 processes the output symbol stream from the transmit processor 802 to obtain an output sample stream that is further processed by converting to analog, amplifying, and upconverting before being transmitted via antenna 805 .
- multiple modems 804 may be used to support multiple-input multiple-output (MIMO) transmission on multiple antennas 805 .
- MIMO multiple-input multiple-output
- Signals are also received at system 800 on antenna 805 from other devices.
- the received signals are provided to modem 804 for demodulation.
- Modem 804 processes the signals by filtering, amplifying, downconverting, and/or digitizing, for example, to obtain input samples.
- Modem 804 or a receive processor 806 may further process the input samples to obtain received symbols.
- Receive processor 806 then processes the symbols by demodulating, deinterleaving, and/or decoding, for example.
- Receive processor 805 then provides decoded data to interface 801 for use by the eNB or UE.
- Receive processor further provides decoded control information to controller 803 .
- Controller 803 may direct the operation of system 800 in the eNB or UE, such as by adjusting timing and power levels.
- a memory 807 may store data and program codes for controller 803 , transmit processor 802 , and/or receive processor 806 .
- Additional components, such as a scheduler 808 may schedule downlink and/or uplink data transmission on one or more component carriers by system 800 (e.g., in an eNB).
- FIG. 9 illustrates EPDCCH-based PUCCH resource allocation according to one embodiment.
- eNodeB 901 transmits on downlink channels to UE 902 .
- eNodeB 901 transmits M EPDDCH and PDSCH to UE 902 on M downlink subframes 903 - 1 through 903 -M starting at subframe n ⁇ k 0 to subframe n ⁇ k M-1 .
- UE 902 has to feedback HARQ-ACK 904 to eNodeB 901 for the M downlink subframes 903 .
- eNodeB 901 reserves PUCCH resources 905 for M subframes.
- M>1 and k m ⁇ 4 and takes values depending on the UL subframe and the TDD UL/DL configuration as shown in Table 4.
- Embodiments of the invention disclosed herein provide a system and method for PUCCH resource compression, which saves PUCCH resources when PDSCH is scheduled by EPDCCH. Additionally, embodiments avoid PUCCH resource collision between multiple UEs and/or between multiple EPDCCH sets.
- the dynamic HARQ-ACK resource offset ( ⁇ ARO ) is used to compress PUCCH resources in an UL subframe 904 as shown in Equation 3 above.
- FIG. 10 is a block diagram illustrating the use of a small ⁇ ARO value within one PUCCH resource allocation block.
- ⁇ ARO 1001 For FDD and TDD, using a relatively small value of ⁇ ARO 1001 , the UE moves from resource 1002 to resource 1003 within PUCCH resource allocation block 1004 . This movement within a single PUCCH resource allocation block is used to avoid collision between different UEs.
- FIG. 11 is a block diagram illustrating the use of a large ⁇ ARO value to move from one PUCCH resource allocation block to another.
- a UE is moved from 1102 in PUCCH resource allocation block 1103 to 1104 within PUCCH resource allocation block 1105 . This movement saves PUCCH resource allocation block 1103 .
- FIG. 12 is a block diagram illustrating a modification of the embodiment shown in FIG. 11 wherein UE resource allocations are moved beyond adjacent blocks.
- ⁇ ARO 1201 moves the UE resource allocation from 1202 in block 1203 to resource 1204 in block 1205 .
- the UE For a PDSCH transmission indicated by the detection of a corresponding EPDCCH in subframe n ⁇ 4, or for an EPDCCH indicating downlink SPS release in subframe n ⁇ 4, the UE shall use:
- n PUCCH (1, p 0 ) n ECCE,q + ⁇ ARO +N PUCCH,q (e1)
- EPDCCH-PRB-set is configured for distributed transmission
- n PUCCH , m ( 1 , p ⁇ 0 ) ⁇ n ECCE , q N RB ECCE , q ⁇ ⁇ N RB ECCE , q + n ′ + ⁇ ARO + N PUCCH , q ( e ⁇ ⁇ 1 )
- EPDCCH-PRB-set is configured for localized transmission
- n ECCE,q is the number of the first ECCE (i.e., lowest ECCE index used to construct the EPDCCH) used for transmission of the corresponding DCI assignment in EPDCCH-PRB-set q.
- the value of ⁇ ARO is determined from the HARQ-ACK resource offset field in the DCI format of the corresponding EPDCCH as given in a Table 5 below, which is a mapping of the ACK/NACK Resource offset field in DCI format 1A/1B/1D/1/2A/2/2B/2C/2D to ⁇ ARO values.
- N PUCCH,q (e1) for EPDCCH-PRB-set q is configured by a higher layer parameter designated as pucch-ResourceStartOffset-r11.
- N RB ECCE,q for EPDCCH-PRB-set q is given in section 6.8A.1 of 3GPP TS 36.211: “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation.”
- n′ is determined from the antenna port used for localized EPDCCH transmission which is described in section 6.8A.5 in 3GPP TS 36.211.
- n PUCCH (1 p 1 ) n ECCE,q +1+ ⁇ ARO +N PUCCH,q (e1)
- EPDCCH-PRB-set is configured for distributed transmission
- n PUCCH ( 1 , p ⁇ 1 ) ⁇ n ECCE , q N RB ECCE , q ⁇ ⁇ N RB ECCE , q + 1 + n ′ + ⁇ ARO + N PUCCH , q ( e ⁇ ⁇ 1 )
- EPDCCH-PRB-set is configured for localised transmission.
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Abstract
Systems and methods for selecting Physical Uplink Control Channel (PUCCH) resources are disclosed. An Enhanced Physical Downlink Control Channel (EPDCCH) is detected in signals received from a base station in a first subframe. A HARQ-ACK resource indicator offset (ΔARO) value is identified for the EPDCCH. A PUCCH resource is selected for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) corresponding to the EPDCCH. The PUCCH resource is selected based upon the ΔARO value. The ΔARO value may correspond to a semi-statically configured PUCCH resource. A second PUCCH resource may be selected for transmission of the HARQ-ACK on a second antenna port. A HARQ-ACK resource offset field value may be detected in a Downlink Control Information (DCI) format of the EPDCCH. A table that maps the HARQ-ACK resource offset field value for certain DCI formats to ΔARO values may be used to determine the ΔARO value for the EPDCCH.
Description
- This application is a continuation of U.S. application Ser. No. 14/026,878, filed Sep. 13, 2013, which claims the benefit of U.S. Provisional Application No. 61/721,880, filed Nov. 2, 2012; U.S. Provisional Application No. 61/750,157, filed Jan. 8, 2013; U.S. Provisional Application No. 61/755,675, filed Jan. 23, 2013; and U.S. Provisional Application No. 61/767,012, filed Feb. 20, 2013, the disclosures of all the above-mentioned applications are incorporated herein by reference in their entireties.
- Long-Term Evolution (LTE) systems are evolving from homogenous networks of macro base stations that provide basic coverage to multi-layered, heterogeneous networks in which a macro base station may be overlaid and complemented by low-power nodes, such as micro, pico, and femto base stations and relay nodes. It has been observed that some of the original signaling design principles used in
LTE Release 8 are no longer optimal when employed in these heterogeneous networks. Enhancements inLTE Release 10 and Release 11, such as improved Downlink (DL) and Uplink (UL) Multi-User Multiple-Input/Multiple-Output (MU-MIMO), DL and UL Coordinated Multipoint Transmission (CoMP)—either with unique physical cell IDs or a shared physical cell ID scenario—and new carrier types for Carrier Aggregation (CA), put a heavy burden on legacy DL control channel capacity. Furthermore, the interference from a macro base station as experienced by User Equipment (UE) within the cell range expansion region of a low power node may prevent successful decoding of DL control signals. Therefore, an Enhanced Physical Downlink Control Channel (EPDCCH) is included for LTE Release 11, where some of the objectives of the EPDCCH include increased control channel capacity, the ability to support frequency domain inter-cell interference control, improved spatial reuse of control channel resources and support of beamforming on the control channel. - Embodiments of the invention provide systems and methods for selecting Physical Uplink Control Channel (PUCCH) resources. An Enhanced Physical Downlink Control Channel (EPDCCH) is detected in signals received from a base station in a first subframe. A HARQ-ACK resource indicator offset (ΔARO) value is identified for the EPDCCH. A PUCCH resource is selected for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) corresponding to the EPDCCH. The PUCCH resource is selected based upon the ΔARO value. A second PUCCH resource may be selected for transmission of the HARQ-ACK on a second antenna port. The ΔARO field in the EPDCCH may alternatively indicate one out of a set of semi-statically configured PUCCH resources.
- A HARQ-ACK resource offset field value may be detected in a Downlink Control Information (DCI) format of the EPDCCH. The ΔARO value for the EPDCCH can be identified by looking up the HARQ-ACK resource offset field value in a table that maps the HARQ-ACK resource offset field value for certain DCI formats to ΔARO values.
- The HARQ-ACK resource offset field value may be a two-bit field in a DCI payload. For example, the two-bit field may correspond to ΔARO values in the range {0, −1, −2, 2}. The HARQ-ACK resource offset field in the DCI format of the EPDCCH may be used to indicate a small offset or a large offset.
- In one embodiment, a user equipment device comprises a receiver processor circuit that is configured to detect an Enhanced Physical Downlink Control Channel (EPDCCH) in signals received from a base station in a subframe n. The user equipment device further comprises a transmit processor circuit configured to select a Physical Uplink Control Channel (PUCCH) resource for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) to the base station in a subframe n+k, where k≥4 and the PUCCH resource is selected based upon a HARQ-ACK resource offset. The user equipment device further comprises a modem configured to transmit the PUCCH resource to the base station. The transmit processor circuit may be further configured to select a second PUCCH resource for transmission of the HARQ-ACK on a second antenna port.
- Having thus described the invention in general terms, reference will now be made to the accompanying drawings, wherein:
-
FIG. 1 illustrates the EPDCCH blocking probability taking into account PUCCH resource blocking between two EPDCCH sets for the case where there is no ARO. -
FIG. 2 illustrates EPDCCH blocking probability for the case where ARO is present with δ=1. -
FIG. 3 is a chart illustrating a comparison of the blocking probability in a lightly loaded system consisting of four UEs. -
FIG. 4 is a chart illustrating a comparison of the PUCCH utilization for the lightly loaded system shown inFIG. 3 . -
FIG. 5 is a chart illustrating a comparison of the blocking probability in a heavily loaded system consisting of fourteen UEs. -
FIG. 6 is a chart illustrating a comparison of the PUCCH utilization for the heavily loaded system shown inFIG. 5 . -
FIG. 7 is a block diagram of a wireless communication network according to one embodiment. -
FIG. 8 is a high level block diagram of a system that may be used as an eNB or UE according to one embodiment. -
FIG. 9 illustrates EPDCCH-based PUCCH resource allocation according to one embodiment. -
FIG. 10 is a block diagram illustrating the use of a small ΔARO value within one PUCCH resource allocation block. -
FIG. 11 is a block diagram illustrating the use of a large ΔARO value to move from one PUCCH resource allocation block to another. -
FIG. 12 block diagram illustrating a modification wherein UE resource allocations are moved beyond adjacent blocks. - The invention now will be described more fully hereinafter with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. One skilled in the art may be able to use the various embodiments of the invention.
- An Enhanced Physical Downlink Control Channel (EPDCCH) is introduced in LTE Release 11. Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) resources on a Physical Uplink Control Channel (PUCCH) need to be determined in response to a Physical Downlink Shared Channel (PDSCH) transmission that is scheduled by either the Physical Downlink Control Channel (PDCCH) or the EPDCCH.
- For PDCCH, the dynamic PUCCH resource is given by the expression:
-
n PUCCH (1) =n CCE +N PUCCH (1) Eq. (1) - wherein NPUCCH (1) is a dynamic PUCCH offset parameter that delineates a dynamic PUCCH region from a semi-static PUCCH region and is either common for the entire cell (cell-specific) or dedicated to a particular UE (UE-specific). The parameter nCCE denotes the first, or lowest-indexed, control channel element used for the PDCCH that schedules a corresponding Downlink Shared Channel (DL-SCH) data transmission on the PDSCH.
- For EPDCCH, it has been agreed that the EPDCCH region is configured in a dedicated manner for a UE. A UE can be configured with up to two EPDCCH sets to form a UE-specific search space for receiving downlink control information. Each set may contain {2, 4, 8} Physical Resource Block (PRB) pairs and each set consists of a number of enhanced Control Channel Elements (ECCEs). The ECCEs are indexed per EPDCCH set. One or more ECCEs are aggregated for transmitting a Downlink Control Information (DCI) message on the EPDCCH. Based on this EPDCCH definition, the dynamic PUCCH resource allocation is defined per EPDCCH set and is modified from equation (1) to
-
n PUCCH (1)=ƒ(n eCCE)+N PUCCH-UE,k (1)+ΔARO Eq. (2) - The ƒ(neCCE) term is a function of the lowest-indexed ECCE in EPDCCH set k that is used to construct the transmitted EPDCCH.
- The NPUCCH-UE,k (1) term is a semi-statically configured dedicated PUCCH resource starting offset for EPDCCH set k.
- ΔARO is a dynamically signaled HARQ-ACK resource indicator offset that can be used to resolve collisions between PUCCH resources from PDCCH and an EPDCCH set. It can also be used to resolve collisions between PUCCH resources associated with two EPDCCH sets.
- The PUCCH regions corresponding to PDCCH and EPDCCH DL assignments can be mapped to non-overlapping PUCCH regions. This partitioning avoids possible collisions between PUCCH resources derived from PDCCH and EPDCCH DL assignments. On the other hand, creating non-overlapping regions is not an efficient use of UL resources because it limits the uplink frequency resources that are available for Uplink Shared Channel (UL-SCH) data transmission on the Physical Uplink Shared Channel (PUSCH).
- Therefore, it is more efficient to allow some degree of overlap between PUCCH regions derived from PDCCH and EPDCCH and use the dynamically signaled HARQ-ACK resource indicator offset (ΔARO) to resolve potential PUCCH resource collisions. A 2-bit ARO field is defined with values [−δ, 0, δ, 2δ], where δ is the unit offset value. In one embodiment of the present invention the ARO described herein is conveyed in a new field in a DCI format scheduling a DL assignment on the PDSCH. If a UE receives a value of ‘0’ it indicates that no offset is applied in determining the PUCCH resource of equation (2). Therefore, an LTE Evolved Node B (eNB) has three possible offsets that it can use to avoid collision between PUCCH resources when the PUCCH regions are overlapped between PDCCH and EPDCCH sets. Furthermore, using a unit offset of δ=2 ensures that two consecutive resources can be reserved in the case of PUCCH transmit diversity.
- To demonstrate the need for an ARO,
FIG. 1 illustrates the EPDCCH blocking probability taking into account PUCCH resource blocking between two EPDCCH sets for the case where there is no ARO. The different curves inFIG. 1 show different levels of overlap in the PUCCH regions associated with the two EPDCCH sets.FIG. 2 illustrates EPDCCH blocking probability for the case where ARO is present with δ=1. ComparingFIGS. 1 and 2 , it can be seen that for a 10% blocking probability, eight UEs (or rather eight DCI allocations) can be scheduled without ARO whereas at least twelve UEs can be scheduled with ARO. This provides a 50% increase in control channel capacity on the EPDCCH. - Although the ARO reduces the overall blocking probability, the ARO also introduces some limitations. For example, if a UE is configured to receive PDSCH on a secondary serving cell (SCell) in carrier aggregation, the UE is also configured to transmit HARQ-ACK feedback using either PUCCH format 1b with channel selection or
PUCCH format 3. For either PUCCH format, the PUCCH resource(s) corresponding to a detected data transmission on the PDSCH on a SCell is indicated by a HARQ-ACK Resource Indicator (ARI) value that is conveyed in the Transmit Power Control (TPC) field of the DCI that schedules the PDSCH. Hence, if EPDCCH schedules PDSCH on a SCell, there is no need for a separate ARO field in the DCI format. Accordingly, embodiments of the present invention include the following options for the ARO field, namely: (1) the ARO field is not configured in the DCI format, (2) the ARO field is configured in the DCI format with redundant information, or (3) designating the ARO field as reserved when the DCI is transmitted on an EPDCCH scheduling PDSCH on a SCell. - Explicit ARO Field for all DCI Formats.
- In one embodiment of the present invention, an explicit ARO field is introduced for all DCI formats that are transmitted on the EPDCCH—except for
DCI format 4, which is used to schedule UL MIMO transmission. - If a UE receives a PDSCH transmission indicated by detection of a DL assignment on the EPDCCH or an EPDCCH indicating downlink Semi Persistent Scheduling (SPS) release on the primary cell, the UE decodes the EPDCCH with an explicit 2-bit ARO field in the DCI payload.
- The ARO field value indicates a resource offset (ΔARO) in the range {−2, 0, 2, 4}. In other embodiments of the present invention, the range may be {−1, 0, 1, 3} or {−2. −1, 0, 2}, the main idea taught here is that small offset values are defined to resolve PUCCH resource collisions. Tables 1 and 2 illustrate alternative ΔARO mappings for values in the ARO field in DCI format.
-
TABLE 1 ARO Field Value Δ ARO 0 0 1 2 2 −1 3 −2 -
TABLE 2 ARO Field Value Δ ARO 0 0 1 −1 2 −2 3 2 - Alternatively, the resource offset range may be configured based on whether the UE is configured for transmit diversity on PUCCH format 1a/1b. When a UE is configured to transmit PUCCH format 1a/1b on two antenna ports, the ARO field indicates an offset in the range {−2, 0, 2, 4}. When a UE is configured to transmit PUCCH format 1a/1b on one antenna port, the ARO field indicates an offset in the range {−1, 0, 1, 2} or in the range {0, 1, 2, 3}.
- The ARO field may be reserved under the following conditions:
- a Time-Division Duplex (TDD) UE that is configured for
PUCCH format 3 and an EPDCCH is detected with the value of the downlink assignment index (DAI) greater than 1 in the DCI message; or - both FDD and TDD carrier aggregation, if an EPDCCH is detected scheduling PDSCH on a configured SCell and the UE is configured for either
PUCCH format 3 or for PUCCH format 1b with channel selection. - Semi-Statically Configured Resources.
- In another embodiment, when a UE is configured for
PUCCH format 3 or when a UE configured for carrier aggregation using PUCCH format 1b with channel selection, an explicit ARO field may be used to indicate a semi-statically configured resource, such as one out of a set of four semi-statically configured resources. - In
LTE Release 10, the TPC field of the DCI format may be re-interpreted as the ARI value when a UE detects a PDCCH scheduling PDSCH on a SCell. Additionally, when a TDD UE that is configured for single cell operation is configured forPUCCH format 3, the TPC field of the DCI format scheduling PDSCH may be used to indicate the ARI if the Downlink Assignment Index (DAI) value is greater than 1. This embodiment restores the TPC field to its original function of providing TPC commands instead of indicating an ARI value. - Therefore, when the DAI value is greater than 1 for an EPDCCH scheduling PDSCH on the primary cell or an EPDCCH indicating SPS release on the primary cell, the TPC field indicates transmit power control commands and the HARQ-ACK resource offset (ARO) field indicates one out of a set of up to four semi-statically configured
PUCCH format 3 resources. - For EPDCCH transmitted on the primary cell and scheduling PDSCH on a secondary cell, the TPC field of the EPDCCH may indicate one out of a set of up to four semi-statically configured
PUCCH format 3 resources. The ARO field of the EPDCCH may be set to zero or may be reserved (i.e., the value is undefined). - In one alternative, both the TPC field and the ARO field of the EPDCCH may indicate the
same PUCCH format 3 resource out of the set of up to four semi-statically configuredPUCCH format 3 resources. In another alternative, the TPC field may indicate the TPC command, while the ARO field indicates onePUCCH format 3 resource out of the set of up to four semi-statically configuredPUCCH format 3 resources. If a UE detects in the same subframe an EPDCCH on the primary cell scheduling PDSCH on the primary cell and another EPDCCH on the primary cell scheduling PDSCH on a secondary cell, the same TPC value is transmitted on both EPDCCHs. - In a further alternative, the TPC field and ARO field may both indicate the same ARI value for selecting a
PUCCH format 3 resource. - Primary Cell Only.
- In a further embodiment, an explicit ARO field is inserted only in DCI formats carried in EPDCCH on the primary cell. The UE decodes the EPDCCH on the primary cell assuming the presence of the ARO field. For EPDCCH on a secondary cell, there is no explicit ARO field.
- PUCCH Resource Allocation for TDD.
- TDD dynamic PUCCH resource allocation corresponding to a detected EPDCCH is similar to FDD with one important exception. For TDD, the UE may need to send HARQ-ACK feedback in an UL subframe corresponding to PDSCH received in multiple DL subframes. In addition to the semi-static resource offset for the EPDCCH set k, PUCCH resources must be reserved for each DL subframe of a length-M HARQ-ACK bundling window. The HARQ-ACK bundling window is also known as the DL association set. The length M of the DL association set depends on the TDD UL/DL configuration and the UL subframe.
- The PUCCH resource regions for EPDCCH scheduling are sequentially allocated for each subframe of the HARQ-ACK DL association set of length M. In particular, for the ith DL subframe, the PUCCH region is offset by the total number of ECCEs in all preceding
subframes 0, . . . , i−1. If there are NeCCE,q,m ECCEs in EPDCCH set q for the subframe n−km, an equal number of NeCCE,q,m PUCCH resources are reserved in UL subframe n for PDSCH transmitted in subframe n−km. - The dynamic PUCCH resource allocation corresponding to subframe n−km for antenna port p0 is given by:
-
- and NeCCE,q RB is the number of ECCEs in a resource block for EPDCCH set q.
- From equation (3) it can be observed that the PUCCH overhead for EPDCCH-based dynamic PUCCH resource allocation can be considerable. As such, it is desirable to design methods to compress PUCCH resource allocation to improve PUSCH transmission capacity. The HARQ-ACK resource offset indicator in this case can therefore be used for two purposes:
- (1) used to avoid PUCCH resource collisions between EPDCCH sets and/or between EPDCCH and PDCCH (similar to FDD); and
- (2) used for PUCCH resource compression between the PUCCH regions that are reserved for each DL subframe in a HARQ-ACK bundling window.
- Incorporating some resource compression reduces the degrees of freedom available for resource collision compared to FDD. For a fully loaded system where a significant number of UEs are scheduled in every subframe, resource compression may not be necessary since each PUCCH region per DL subframe is required for PUCCH transmission. For such a scenario, it is desirable to specify the same collision avoidance capability for TDD and FDD.
- PUCCH Resource Compression and Collision Avoidance Methods.
- 3-Bit ARO Field.
- In one embodiment, the ARO field size may be set to 3 bits in order to support both collision avoidance and PUCCH resource compression. Table 3 illustrates an exemplary mapping of the ARO field value in the DCI format to the PUCCH resource in
Equation 3 above. -
TABLE 3 ARO Value in ΔARO ΔARO DCI Format (Option 1) (Option 2) 0 0 0 1 2 2 2 −1 −1 3 −2 −2 4 -NeCCE, q, i-1 -NeCCE, q, i-1 5 -NeCCE, q, i-1 + 2 -(NeCCE, q, i-1 + NeCCE, q, i-2) 6 -NeCCE, q, i-1 − 1 -(NeCCE, q, i-1 + NeCCE, q, i-2 + NeCCE, i-3, j) 7 -NeCCE, q, i-1 − 2 Reserved - For
Option 1 in Table 3, the last four entries offset the PUCCH resource for the ith DL subframe by the number of ECCEs in subframe i−1 of EPDCCH set q. These entries retain resource collision avoidance capability as in FDD by further offsetting by the values {−2, 0, 1, 2}. This approach allows a resource compression on the order of one DL subframe. For example, for TDD UL/DL configuration 2 where the length of the DL association set M=4 in both UL subframes n=2 and n=7, it is possible to save the implicit resource allocation for the fourth DL subframe of the DL association set. A different mapping of ARO values, consisting of a mix of resource compression and collision avoidance, may also be used in other embodiments. - For
Option 2 in Table 3, the last four entries offset the resource allocation by the number of ECCEs allocated to set q in one or more previous DL subframes. - Trade-Off PUCCH Resource Collision Avoidance and Resource Compression.
- TDD PUCCH resource compression reduces the resource collision avoidance capability if the ARO field size is unchanged with respect to FDD. If this is deemed acceptable in order to keep the same ARO field size in DCI formats for both duplex modes, the following set of values may be used in various options.
-
Option 1 - For the ith subframe of the DL association set, the set of ARO values is given as
-
ΔARO∈{0,2,−N ECCE,q,i-1−1,−N ECCE,q,i-1−2}i>0. - For subframe i=0, this set reverts back to the same one for FDD, i.e. {0, 2, −1, −2}, whereas for i>1, resource compression of one DL subframe is possible.
-
Option 2 - For the ith subframe of the HARQ-ACK bundling window, the set of ARO values is given as
-
ΔARO∈{0,2,−N ECCE,i-1,j+1,−N ECCE,i-1,j+2}i>0. - For subframe i=0, this set reverts back to the same one for FDD, i.e. {0, 2, −1, −2}, whereas for i>1, resource compression of one DL subframe is possible.
-
Options -
Option 3 - Alternatively, the ARO set may be defined as
-
ΔARO∈{0,2,−1,−N ECCE,q,0 }i=1 -
ΔARO∈{0,2,−N ECCE,q,0,−(N ECC,q,0 +N ECCE,q,1)}i=2 -
ΔARO∈{0,−N ECC,q,0,−(N ECC,q,0 +N ECCE,q,1),−(N ECC,q,0 +N ECCE,q,1 +N ECCE,q,2)}i>2 - Other alternative options are not precluded as the main idea taught by the present invention is that both small offsets and large offsets can be designed for the ARO field. The small offsets are used to resolve PUCCH resource collisions between assignments in two EPDCCH sets or between an EPDCCH set and PDCCH-based resource allocation. The large offset on the other hand, is used to compress PUCCH resource by moving from one reserved block to another.
-
FIG. 3 is a chart illustrating a comparison of the blocking probability given two EPDCCH sets, TDD UL/DL Configuration # 2 and a lightly loaded system consisting of four UEs. -
FIG. 4 is a chart illustrating a comparison of the PUCCH utilization for the lightly loaded system shown inFIG. 3 . -
FIG. 5 is a chart illustrating a comparison of the blocking probability given two EPDCCH sets, TDD UL/DL Configuration # 2 and a heavily loaded system consisting of fourteen UEs. -
FIG. 6 is a chart illustrating a comparison of the PUCCH utilization for the heavily loaded system shown inFIG. 5 . -
FIGS. 3-6 compareoptions -
FIGS. 3 and 5 show the blocking probability for each scheduled DL subframe assuming all UEs are scheduled in each subframe of the bundling window.FIGS. 4 and 6 show the PUCCH utilization for each PUCCH sub-region corresponding to each of the scheduled DL subframes. The comparison results illustrated inFIGS. 3-6 can be summarized as follows. - For a lightly loaded system, all ARO options (including the FDD ARO set) achieve the intended goal of reducing the blocking probability with respect to no ARO indication. Accordingly, one PUCCH sub-region can be saved for all three options for combining resource compression with collision avoidance. In one embodiment,
options - For a heavily loaded system, although PUCCH utilization approaches 100% in the first sub-region, there is still appreciable PUCCH utilization in the last sub-region (i.e., there is no PUCCH saving compared to using the FDD ARO set). Furthermore, from a system perspective, there may not be significant gain in minimizing PUCCH overhead for a fully loaded system. Although it may be argued that if higher aggregation levels are more likely to be transmitted the PUCCH resource utilization for FDD is low, it is not necessarily desirable to increase packing efficiency per PUCCH PRB because of the resulting higher intra-cell interference (this is also true for PDCCH-based PUCCH resource allocation).
-
FIG. 5 also indicates that the blocking probability is low forOption 3 because, for each DL subframe, more degrees of freedom are used for resource compression to the detriment of collision avoidance. In contrast,Options - EPDCCH Monitoring Set for PUCCH Resource Allocation.
- An LTE Release 11 UE can be configured to monitor the EPDCCH on a subset of all possible DL and special subframes. When the UE is not configured to monitor EPDCCH in a subframe, it monitors the legacy PDCCH for DL assignments including PDCCH indicating SPS release and UL grants. It may occur that in the same DL association set of length M>1, the UE may be configured to monitor EPDCCH in some subframes and PDCCH in the other subframes. For such scenarios the PUCCH resource allocation needs to be specified.
- For a PDSCH transmission indicated by the detection of corresponding EPDCCH or a EPDCCH indicating downlink SPS release in sub-frame n−km the PUCCH resource for antenna port p0 is
-
- wherein S(m) is the subset of DL subframes in the DL association set {n−k0, n−k1, . . . , n−km-1} for which the UE is configured to monitor the EPDCCH.
- This TDD resource allocation implies that if a UE is configured to monitor EPDCCH in all MDL subframes of a DL association set, then
-
- PUCCH resources shall be reserved for set q. The worst case occurs for TDD UL-DL configuration 5 with nine DL subframes and one UL subframe.
-
FIG. 7 is a block diagram of awireless communication network 700, which may be an LTE network that utilizes orthogonal frequency-division multiple access (OFDMA) on the downlink and single-carrier frequency division multiple access (SC-FDMA) on the uplink. LTE partitions system bandwidth into multiple orthogonal subcarriers, which may be referred to as frequency tones or frequency bins. Each subcarrier may be modulated with data, control, or reference signals. Thewireless network 700 includes a number of evolved Node Bs (eNBs) 701 and other network entities. TheeNBs 701 communicate with user equipment devices (UEs) 702, 705. EacheNB 701 provides communication services for a particular geographic area or “cell” 703.eNB 701 may be a macro base station, micro base station, pico base station, or femto base station, for example. Anetwork controller 704 may be coupled to a set ofeNBs 701 and provide coordination and control for theseeNBs 701. -
UEs wireless network 700.UEs UE 702 communicates with aneNB 701 serving thecell 703 in which theUE 702 is located. - A
UE 702 may communicate with more than one eNB 701 if thecells 703 of theeNBs 701 overlap. OneeNB 701 will be the primary cell (PCell) and theother eNBs 701 will be secondary serving cells (SCell). -
FIG. 8 is a high level block diagram of asystem 800 that may be used as an eNB or UE, which may be, for example,eNB 701 orUE 702 inFIG. 7 .System 800 receives data to be transmitted from aninterface 801 at transmitprocessor 802. The data may include, for example, audio or video information or other data file information to be transmitted on a PUSCH. The transmitprocessor 802 may also receive control or HARQ-ACK information to be transmitted on a PUCCH, PUSCH, or SRS, from acontroller 803. Transmitprocessor 802 processes (e.g., encode and symbol map) the data and control information to obtain data symbols, control symbols, and reference symbols. The transmitprocessor 802 may also perform spatial processing or precoding on the data symbols and/or the control symbols and reference symbols. The output of the transmitprocessor 802 is provided to amodem 804.Modem 804 processes the output symbol stream from the transmitprocessor 802 to obtain an output sample stream that is further processed by converting to analog, amplifying, and upconverting before being transmitted viaantenna 805. In other embodiments,multiple modems 804 may be used to support multiple-input multiple-output (MIMO) transmission onmultiple antennas 805. - Signals are also received at
system 800 onantenna 805 from other devices. The received signals are provided tomodem 804 for demodulation.Modem 804 processes the signals by filtering, amplifying, downconverting, and/or digitizing, for example, to obtain input samples.Modem 804 or a receiveprocessor 806 may further process the input samples to obtain received symbols. Receiveprocessor 806 then processes the symbols by demodulating, deinterleaving, and/or decoding, for example. Receiveprocessor 805 then provides decoded data to interface 801 for use by the eNB or UE. Receive processor further provides decoded control information tocontroller 803. -
Controller 803 may direct the operation ofsystem 800 in the eNB or UE, such as by adjusting timing and power levels. Amemory 807 may store data and program codes forcontroller 803, transmitprocessor 802, and/or receiveprocessor 806. Additional components, such as ascheduler 808 may schedule downlink and/or uplink data transmission on one or more component carriers by system 800 (e.g., in an eNB). -
FIG. 9 illustrates EPDCCH-based PUCCH resource allocation according to one embodiment.eNodeB 901 transmits on downlink channels toUE 902. For example,eNodeB 901 transmits M EPDDCH and PDSCH toUE 902 on M downlink subframes 903-1 through 903-M starting at subframe n−k0 to subframe n−kM-1. In a subsequent uplink subframe n,UE 902 has to feedback HARQ-ACK 904 toeNodeB 901 for theM downlink subframes 903. -
eNodeB 901reserves PUCCH resources 905 for M subframes. For FDD, M=1 and k0=4. For TDD, M>1 and km≥4 and takes values depending on the UL subframe and the TDD UL/DL configuration as shown in Table 4. Embodiments of the invention disclosed herein provide a system and method for PUCCH resource compression, which saves PUCCH resources when PDSCH is scheduled by EPDCCH. Additionally, embodiments avoid PUCCH resource collision between multiple UEs and/or between multiple EPDCCH sets. -
TABLE 4 UL/DL Subframe n Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, — — 6 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12, 9, 8, 7, 5, 4, — — — — — — — 11, 6 6 — — 7 7 5 — — 7 7 — - The dynamic HARQ-ACK resource offset (ΔARO) is used to compress PUCCH resources in an
UL subframe 904 as shown inEquation 3 above. -
FIG. 10 is a block diagram illustrating the use of a small ΔARO value within one PUCCH resource allocation block. For FDD and TDD, using a relatively small value of ΔARO 1001, the UE moves fromresource 1002 toresource 1003 within PUCCHresource allocation block 1004. This movement within a single PUCCH resource allocation block is used to avoid collision between different UEs. -
FIG. 11 is a block diagram illustrating the use of a large ΔARO value to move from one PUCCH resource allocation block to another. For TDD with M=4 downlink subframes, using a relatively large value of ΔARO 1101, a UE is moved from 1102 in PUCCHresource allocation block 1103 to 1104 within PUCCHresource allocation block 1105. This movement saves PUCCHresource allocation block 1103. -
FIG. 12 is a block diagram illustrating a modification of the embodiment shown inFIG. 11 wherein UE resource allocations are moved beyond adjacent blocks. InFIG. 12 ΔARO 1201 moves the UE resource allocation from 1202 inblock 1203 toresource 1204 inblock 1205. - FDD HARQ-ACK Procedure for One Configured Serving Cell
- For a PDSCH transmission indicated by the detection of a corresponding EPDCCH in subframe n−4, or for an EPDCCH indicating downlink SPS release in subframe n−4, the UE shall use:
-
n PUCCH (1,p 0 ) =n ECCE,q+ΔARO +N PUCCH,q (e1) - if EPDCCH-PRB-set is configured for distributed transmission; or
-
- if EPDCCH-PRB-set is configured for localized transmission,
- These values are for antenna port p0. where nECCE,q is the number of the first ECCE (i.e., lowest ECCE index used to construct the EPDCCH) used for transmission of the corresponding DCI assignment in EPDCCH-PRB-set q. The value of ΔARO is determined from the HARQ-ACK resource offset field in the DCI format of the corresponding EPDCCH as given in a Table 5 below, which is a mapping of the ACK/NACK Resource offset field in DCI format 1A/1B/1D/1/2A/2/2B/2C/2D to ΔARO values.
- NPUCCH,q (e1) for EPDCCH-PRB-set q is configured by a higher layer parameter designated as pucch-ResourceStartOffset-r11. NRB ECCE,q for EPDCCH-PRB-set q is given in section 6.8A.1 of 3GPP TS 36.211: “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation.” n′ is determined from the antenna port used for localized EPDCCH transmission which is described in section 6.8A.5 in 3GPP TS 36.211.
- For two antenna port transmission the PUCCH resource for antenna port p1 is given by
-
n PUCCH (1p 1 ) =n ECCE,q+1+ΔARO +N PUCCH,q (e1) - if EPDCCH-PRB-set is configured for distributed transmission; or
-
- if EPDCCH-PRB-set is configured for localised transmission.
-
TABLE 5 ACK/NACK Resource Offset Field in DCI Format 1A/1B/1D/1/2A/2/2B/2C/ 2D Δ ARO 0 0 1 −1 2 −2 3 2 - Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions, and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (18)
1. A method for selecting Physical Uplink Control Channel (PUCCH) resources, comprising:
detecting an Enhanced Physical Downlink Control Channel (EPDCCH) in signals received from a base station in a first subframe;
identifying a HARQ-ACK resource indicator offset (ΔARO) value for the EPDCCH; and
selecting a PUCCH resource for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) corresponding to the EPDCCH, wherein the PUCCH resource is selected based upon the ΔARO value.
2. The method of claim 1 , further comprising:
selecting a second PUCCH resource for transmission of the HARQ-ACK on a second antenna port.
3. The method of claim 1 , further comprising:
detecting a HARQ-ACK resource offset field value in a Downlink Control Information (DCI) format of the EPDCCH; and
identifying the ΔARO value for the EPDCCH by looking up the HARQ-ACK resource offset field value in a table.
4. The method of claim 3 , wherein the table maps the HARQ-ACK resource offset field value for certain DCI formats to ΔARO values.
5. The method of claim 3 , wherein the HARQ-ACK resource offset field value is a two-bit field in a DCI payload.
6. The method of claim 5 , wherein the two-bit field corresponds to ΔARO values in the range {0, −1, −2, 2}.
7. The method of claim 1 , wherein the ΔARO value indicates one out of a set of semi-statically configured PUCCH resources.
8. The method of claim 3 , wherein a HARQ-ACK resource offset field in the DCI format of the EPDCCH is used to indicate a small offset or a large offset.
9. The method of claim 8 , further comprising:
a two-bit HARQ-ACK resource offset field (ΔARO) is inserted in an EPDCCH set scheduling downlink assignments on the PDSCH; and
the value of the HARQ-ACK resource offset field for PUCCH resource allocation for subframe n−km indicate values in the range {0, −1, −NECCE,q,m-1−1, NECCE,q,m-1−2}.
10. A user equipment device, comprising:
a receiver processor circuit configured to:
detect an Enhanced Physical Downlink Control Channel (EPDCCH) in signals received from a base station in a subframe n;
a transmit processor circuit configured to:
select a Physical Uplink Control Channel (PUCCH) resource for transmission of a Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) to the base station in a subframe n+4, the PUCCH resource selected based upon a HARQ-ACK resource offset; and
a modem configured to transmit the PUCCH resource to the base station.
11. The user equipment device of claim 10 , wherein the transmit processor circuit is further configured to:
select a second PUCCH resource for transmission of the HARQ-ACK on a second antenna port.
12. The user equipment device of claim 10 , wherein the receiver processor circuit is further configured to:
detect a HARQ-ACK resource offset field value in a Downlink Control Information (DCI) format of the EPDCCH; and
the transmit processor circuit is further configured to:
identify the HARQ-ACK resource offset for the EPDCCH by looking up the HARQ-ACK resource offset field value in a table.
13. The user equipment device of claim 12 , wherein the table maps the HARQ-ACK resource offset field value for certain DCI formats to HARQ-ACK resource offset values.
14. The user equipment device of claim 12 , wherein the HARQ-ACK resource offset field value is a two-bit field in a DCI payload.
15. The user equipment device of claim 14 , wherein the two-bit field corresponds to HARQ-ACK resource offset values in the range {0, −1, −2, 2}.
16. The user equipment device of claim 14 , wherein the two-bit field corresponds to HARQ-ACK resource offset values in the range {0, −1, −NECCE,q,m-1−1, NECCE,q,m-1−2}.
17. The user equipment device of claim 10 , wherein the two-bit HARQ-ACK resource offset value indicates one out of a set of semi-statically configured PUCCH resources.
18. The user equipment device of claim 14 , wherein HARQ-ACK feedback information is transmitted on the indicated PUCCH resource.
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Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5395902B2 (en) | 2009-06-16 | 2014-01-22 | シャープ株式会社 | Mobile station apparatus, base station apparatus, and radio communication method |
KR101925031B1 (en) | 2011-06-24 | 2018-12-04 | 엘지전자 주식회사 | Method for transmitting uplink control information, user equipment, method for receiving uplink control information, and base station |
WO2014049917A1 (en) | 2012-09-27 | 2014-04-03 | パナソニック株式会社 | Wireless communication terminal, base station device, and resource allocation method |
US11245507B2 (en) * | 2012-11-02 | 2022-02-08 | Texas Instruments Incorporated | Efficient allocation of uplink HARQ-ACK resources for LTE enhanced control channel |
CN104823389A (en) * | 2012-11-29 | 2015-08-05 | Lg电子株式会社 | Method and apparatus for transmitting acknowledgement of reception in wireless communication system |
US9271242B2 (en) * | 2013-01-14 | 2016-02-23 | Intel IP Corporation | Energy-harvesting devices in wireless networks |
US9112662B2 (en) * | 2013-01-17 | 2015-08-18 | Samsung Electronics Co., Ltd. | Overhead reduction for transmission of acknowledgment signals |
TWI615050B (en) * | 2013-01-18 | 2018-02-11 | 諾基亞對策與網路公司 | Aro values in pucch resource allocation for epdcch in tdd |
US9401795B2 (en) | 2013-01-31 | 2016-07-26 | Lg Electronics Inc. | Method and apparatus for transmitting receipt acknowledgement in wireless communication system |
US9397796B2 (en) * | 2013-03-13 | 2016-07-19 | Samsung Electronics Co., Ltd. | Computing and transmitting channel state information in adaptively configured TDD communication systems |
US9924536B2 (en) * | 2013-05-22 | 2018-03-20 | Lg Electronics Inc. | Communication method for terminal in wireless communication system and terminal using same |
WO2015016575A1 (en) * | 2013-07-29 | 2015-02-05 | 엘지전자 주식회사 | Method and device for performing coordinated multi-point transmission based on selection of transmission point |
US9844039B2 (en) * | 2013-09-26 | 2017-12-12 | Sharp Kabushiki Kaisha | Terminal, base station, and communication method |
JP6375382B2 (en) * | 2014-02-14 | 2018-08-15 | エルジー エレクトロニクス インコーポレイティド | HARQ-ACK transmission method and apparatus in wireless communication system |
EP3198961B1 (en) * | 2014-09-24 | 2019-06-26 | Telefonaktiebolaget LM Ericsson (publ) | Method and bs for scheduling ue and method and ue for transmitting harq |
US9800387B2 (en) * | 2014-11-06 | 2017-10-24 | Intel IP Corporation | Computing apparatus with cross-subframe scheduling |
WO2016108665A1 (en) * | 2014-12-31 | 2016-07-07 | 엘지전자(주) | Method for allocating resource in wireless communication system and apparatus therefor |
CN111510252B (en) | 2014-12-31 | 2023-04-07 | Lg 电子株式会社 | Method for transmitting ACK/NACK in wireless communication system and apparatus using the same |
US9985742B2 (en) * | 2015-04-06 | 2018-05-29 | Samsung Electronics Co., Ltd. | Transmission power control for an uplink control channel |
US11362759B2 (en) | 2015-04-06 | 2022-06-14 | Samsung Electronics Co., Ltd. | Transmission power control for an uplink control channel |
EP3281331A1 (en) * | 2015-04-10 | 2018-02-14 | Telefonaktiebolaget LM Ericsson (publ) | Implementation of harq on pusch for multiple carriers |
WO2016206083A1 (en) * | 2015-06-26 | 2016-12-29 | 华为技术有限公司 | Method and apparatus for uplink data transmission |
JP6907117B2 (en) * | 2015-08-21 | 2021-07-21 | 株式会社Nttドコモ | Terminals, base stations and wireless communication methods |
CN108353313A (en) * | 2015-11-05 | 2018-07-31 | 株式会社Ntt都科摩 | User terminal, wireless base station and wireless communications method |
CN111556571B (en) | 2015-11-11 | 2023-11-14 | 华为技术有限公司 | Method and device for transmitting scheduling information |
US10932237B2 (en) | 2016-03-01 | 2021-02-23 | Nokia Technologies Oy | PUCCH resource allocation |
US10516463B2 (en) | 2016-04-07 | 2019-12-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for indicating a transmission time offset of a feedback message |
US10440706B2 (en) * | 2016-08-08 | 2019-10-08 | Sharp Kabushiki Kaisha | Systems and methods for PUCCH resource allocation and HARQ-ACK reporting with processing time reduction |
TWI624168B (en) * | 2016-10-21 | 2018-05-11 | 元智大學 | An intelligent deployment cascade control device based on an fdd-ofdma indoor small cell in multi-user and interference environments |
EP3531599A4 (en) * | 2016-11-04 | 2019-11-06 | Huawei Technologies Co., Ltd. | Harq-ack feedback information transmission method and related apparatus |
CN108024345B (en) * | 2016-11-04 | 2023-04-28 | 中兴通讯股份有限公司 | Method and device for determining transmission resources of uplink control information |
CN108306720B (en) * | 2017-01-13 | 2022-06-21 | 北京三星通信技术研究有限公司 | Method and equipment for transmitting UCI information |
WO2019028735A1 (en) * | 2017-08-10 | 2019-02-14 | Lenovo (Beijing) Limited | Uplink control channel resource determination |
US10715283B2 (en) * | 2017-10-02 | 2020-07-14 | Kt Corporation | Apparatus and method of transmitting and receiving HARQ ACK/NACK information for new radio |
BR112020007915B1 (en) * | 2017-10-26 | 2021-02-23 | Telefonaktiebolaget Lm Ericsson (Publ) | METHOD PERFORMED BY A WIRELESS DEVICE, WIRELESS DEVICE AND METHOD FOR OPERATING A WIRELESS DEVICE |
US10306669B2 (en) | 2017-10-26 | 2019-05-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Physical uplink control channel (PUCCH) resource allocation |
CN110351019B (en) * | 2018-04-04 | 2020-12-15 | 华为技术有限公司 | Communication method and device |
EP4224759A1 (en) * | 2018-04-06 | 2023-08-09 | Telefonaktiebolaget LM Ericsson (publ) | Power control for feedback signaling |
US11368260B2 (en) | 2018-05-03 | 2022-06-21 | Mediatek Singapore Pte. Ltd. | Method and apparatus for reporting hybrid automatic repeat request-acknowledge information in mobile communications |
US20210235481A1 (en) * | 2018-05-07 | 2021-07-29 | Ntt Docomo, Inc. | User terminal and radio communication method |
CN117318893A (en) * | 2018-08-09 | 2023-12-29 | 北京三星通信技术研究有限公司 | Uplink transmission method, user equipment, base station and computer readable medium |
TWI729708B (en) | 2019-02-20 | 2021-06-01 | 華碩電腦股份有限公司 | Method and apparatus for handling sidelink and uplink harq-ack feedback in a wireless communication system |
CN112583543B (en) * | 2019-09-27 | 2022-08-02 | 维沃移动通信有限公司 | Resource determination method and communication equipment |
CA3195885A1 (en) | 2020-10-19 | 2022-04-28 | XCOM Labs, Inc. | Reference signal for wireless communication systems |
WO2022093988A1 (en) | 2020-10-30 | 2022-05-05 | XCOM Labs, Inc. | Clustering and/or rate selection in multiple-input multiple-output communication systems |
US11778607B2 (en) | 2021-04-01 | 2023-10-03 | Nokia Technologies Oy | Using relative transmission occasion delay indexing |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130230030A1 (en) * | 2012-03-05 | 2013-09-05 | Samsung Electronics Co., Ltd. | Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types |
US20150195822A1 (en) * | 2012-09-28 | 2015-07-09 | Seunghee Han | Dynamic hybrid automatic repeat request-acknowledgement (harq-ack) transmission with enhanced physical downlink control channels |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100703287B1 (en) * | 2005-07-20 | 2007-04-03 | 삼성전자주식회사 | System and method for transmitting/receiving resource allocation information in a communication system |
KR101410120B1 (en) | 2007-08-21 | 2014-06-25 | 삼성전자주식회사 | Apparatus and method for transmitting/receiving the hybrid- arq ack/nack signal in mobile communication system |
KR20100011879A (en) * | 2008-07-25 | 2010-02-03 | 엘지전자 주식회사 | Method of receiving data in wireless communication system |
KR101573072B1 (en) * | 2008-08-27 | 2015-12-01 | 엘지전자 주식회사 | Method of transmitting control information in wireless communication system |
KR101629298B1 (en) | 2008-10-30 | 2016-06-10 | 엘지전자 주식회사 | Method of transmitting control signal in wireless communication system and appratus therefore |
KR101715938B1 (en) * | 2009-03-03 | 2017-03-14 | 엘지전자 주식회사 | Method and apparatus for transmitting harq ack/nack signal in multiple antenna system |
CN101841892B (en) * | 2009-03-18 | 2012-10-03 | 中国移动通信集团公司 | Method, equipment and system for indicating and detecting PDCCH in a carrier aggregation system |
KR101827584B1 (en) | 2010-01-08 | 2018-02-08 | 인터디지탈 패튼 홀딩스, 인크 | Method and apparatus for channel resource mapping in carrier aggregation |
HUE024571T2 (en) * | 2010-08-20 | 2016-02-29 | Ericsson Telefon Ab L M | Arrangement and method for identifying pucch format 3 resources |
KR101771550B1 (en) * | 2010-10-15 | 2017-08-29 | 주식회사 골드피크이노베이션즈 | Method of Transmitting and Receiving Ack/Nack Signal and Apparatus Thereof |
CN102098151B (en) * | 2010-12-28 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of sending method of correct/error response message and user terminal |
CN102638879A (en) * | 2011-02-12 | 2012-08-15 | 北京三星通信技术研究有限公司 | Method for allocating acknowledgement (ACK)/negative acknowledgement (NACK) channel resource |
KR101919780B1 (en) * | 2011-03-03 | 2018-11-19 | 엘지전자 주식회사 | Method and apparatus for transmitting acknowledgment information in a wireless communication system |
CN102215094B (en) * | 2011-06-01 | 2013-11-20 | 电信科学技术研究院 | Method, system and equipment for sending and receiving uplink feedback information |
JP5895388B2 (en) * | 2011-07-22 | 2016-03-30 | シャープ株式会社 | Terminal device, base station device, integrated circuit, and communication method |
CN102316595B (en) | 2011-09-30 | 2017-04-12 | 中兴通讯股份有限公司 | Resource determination method and device for physical uplink control channel (PUCCH) of large-band-width system |
CN102573094B (en) | 2012-01-17 | 2015-04-08 | 电信科学技术研究院 | Method and device for transmitting DCI (downlink control information) |
US8743820B2 (en) * | 2012-05-30 | 2014-06-03 | Intel Corporation | PUCCH resource allocation with enhanced PDCCH |
CN104335517B (en) * | 2012-05-31 | 2017-10-20 | Lg电子株式会社 | Method and its device for receiving and dispatching control signal |
US9148881B2 (en) * | 2012-08-02 | 2015-09-29 | Panasonic Intellectual Property Corporation Of America | Base station device, terminal device, resource allocation method and response signal transmission method |
US9801171B2 (en) * | 2012-10-02 | 2017-10-24 | Industry-University Cooperation Foundation Hanyang University | Transmission method and reception method of downlink signal and channel, terminal thereof, and base station thereof |
US11245507B2 (en) * | 2012-11-02 | 2022-02-08 | Texas Instruments Incorporated | Efficient allocation of uplink HARQ-ACK resources for LTE enhanced control channel |
KR101724220B1 (en) * | 2012-11-14 | 2017-04-06 | 엘지전자 주식회사 | Method for operating terminal in carrier aggregation system, and apparatus using said method |
-
2013
- 2013-09-13 US US14/026,878 patent/US11245507B2/en active Active
- 2013-11-04 CN CN202010071852.5A patent/CN111277398B/en active Active
- 2013-11-04 WO PCT/US2013/068315 patent/WO2014071304A1/en active Application Filing
- 2013-11-04 CN CN202210998629.4A patent/CN115208547A/en active Pending
- 2013-11-04 CN CN201380055693.8A patent/CN104782204B/en active Active
- 2013-11-04 JP JP2015541834A patent/JP6497706B2/en active Active
-
2018
- 2018-12-21 JP JP2018240280A patent/JP7148768B2/en active Active
-
2021
- 2021-10-15 JP JP2021169512A patent/JP7344264B2/en active Active
-
2022
- 2022-02-07 US US17/666,120 patent/US20220158802A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130230030A1 (en) * | 2012-03-05 | 2013-09-05 | Samsung Electronics Co., Ltd. | Harq-ack signal transmission in response to detection of control channel type in case of multiple control channel types |
US20150195822A1 (en) * | 2012-09-28 | 2015-07-09 | Seunghee Han | Dynamic hybrid automatic repeat request-acknowledgement (harq-ack) transmission with enhanced physical downlink control channels |
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