WO2016161629A1 - Procédés et appareil destinés à l'attribution d'une ressource pucch dans une mtc - Google Patents

Procédés et appareil destinés à l'attribution d'une ressource pucch dans une mtc Download PDF

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Publication number
WO2016161629A1
WO2016161629A1 PCT/CN2015/076305 CN2015076305W WO2016161629A1 WO 2016161629 A1 WO2016161629 A1 WO 2016161629A1 CN 2015076305 W CN2015076305 W CN 2015076305W WO 2016161629 A1 WO2016161629 A1 WO 2016161629A1
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Prior art keywords
mtc
pucch resource
pucch
pdsch
index
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PCT/CN2015/076305
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English (en)
Inventor
Min Wu
Tao Chen
Huamin Chen
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Mediatek Singapore Pte. Ltd.
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Priority to PCT/CN2015/076305 priority Critical patent/WO2016161629A1/fr
Publication of WO2016161629A1 publication Critical patent/WO2016161629A1/fr

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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
    • H04L1/1861—Physical mapping arrangements
    • 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
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message

Definitions

  • the present invention generally relates to wireless communications and, more particularly, to methods for physical uplink control channel (PUCCH) resource allocation for machine type communication (MTC) devices.
  • PUCCH physical uplink control channel
  • MTC machine type communication
  • Wireless communication systems are widely deployed to provide various type of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple used by sharing the available system resources (e.g., bandwidth and transmit power) .
  • Example of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA systems) .
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA systems frequency division multiple access
  • 3GPP 3 rd Generation Partnership Project
  • LTE Long Term Evolution
  • OFDMA orthogonal frequency division multiple access
  • a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals.
  • Each terminal communicates with one or more base stations via transmission on the forward and reverse links.
  • the forward link (or downlink) refers to the communication link from the base stations to the terminals
  • the reverse link (or uplink) refers to the communication link from the terminals to the base stations.
  • This communication link may be established via a single-input single-output, multiple-input single-output or a multiple-input multiple-out (MIMO) system.
  • MIMO multiple-input multiple-out
  • Wireless devices may include user equipments (UEs) .
  • UEs may include cellular phones, smart phones, personal digital assistants (PDAs) , wireless modems, handheld devices, laptop computers, netbooks, etc.
  • Some UEs may be considered machine type communication (MTC) UEs, which may include remote devices such as sensors, meters, location tags, etc.
  • a remote device may communicate with a base station, another remote device, or some other entity.
  • Machine type communication may refer to communication involving at least one remote device on at least one end of the communication.
  • PUCCH physical uplink control channel
  • the methods can be applicable for machine type communications (MTC) devices.
  • MTC machine type communications
  • the methods can be applicable for non-MTC devices.
  • a method for wireless communications which is performed, for example, by a UE is provided.
  • the method includes: receiving a physical downlink shared data channel (PDSCH) ; determining corresponding PUCCH resource based on one or more following parameters used for the PDSCH transmission: MTC band index, the lowest physical resource block (PRB) index and antenna port index; and transmitting ACK/NACK of the PDSCH on the determined PUCCH resource.
  • PDSCH physical downlink shared data channel
  • PRB physical resource block
  • a method for wireless communications which is performed, for example, by a UE.
  • the method includes: receiving an initial PUCCH resource value indicated in a DL message (MSG) during a PRACH procedure; transmitting DL ACK/NACK on the initial PUCCH resource; receiving a reconfigured PUCCH resource value indicated in a higher layer signaling; and transmitting DL ACK/NACK on the reconfigured PUCCH resource.
  • MSG DL message
  • a method for wireless communications which is performed, for example, by a UE.
  • the method generally includes: determining a PUCCH resource based on one or more following parameters used for corresponding PDSCH transmission: MTC band index, the lowest PRB index and antenna port index; transmitting ACK/NACK of corresponding PDSCH on the determined PUCCH resource; receiving a PUCCH resource value indicated in a higher layer signaling; and transmitting DL ACK/NACK on the indicated PUCCH resource.
  • an apparatus for wireless communications includes a receiver for receiving a PDSCH; a determiner for determining corresponding PUCCH resource based on one or more following parameters used for the PDSCH transmission: MTC band index, the lowest PRB index and antenna port index; and a transmitter for transmitting ACK/NACK of the PDSCH on the determined PUCCH resource.
  • an apparatus for wireless communications includes a receiver for receiving an initial PUCCH resource value indicated in a DL MSG during a PRACH procedure; a transmitter for transmitting DL ACK/NACK on the initial PUCCH resource; the receiver is further used for receiving a reconfigured PUCCH resource value indicated in a higher layer signaling; and the transmitter is further used for transmitting DL ACK/NACK on the reconfigured PUCCH resource.
  • FIG. 1 is a block diagram conceptually illustrating an example of wireless communications system, in accordance with certain embodiments of the present invention.
  • FIG. 2 illustrates an example of implicit PUCCH resource allocation for MTC devices, in accordance with certain embodiments of the present invention.
  • FIG. 3 illustrates an example of PDSCH band specific PUCCH region allocation for MTC devices, in accordance with certain embodiments of the present invention.
  • FIG. 4 illustrates an example MTC band partition within 10 MHz system bandwidth.
  • FIG. 5 illustrates an example of a common PUCCH region allocation for multiple PDSCH bands for MTC devices, in accordance with certain embodiments of the present invention.
  • FIG. 6 ⁇ 7 illustrates examples of PUCCH frequency hopping for PUCCH repetition.
  • FIG. 8 illustrates an example of explicit PUCCH resource allocation for MTC devices under coverage enhancement, in accordance with certain embodiments of the present invention.
  • FIG. 9 illustrates an example of combining implicit and explicit PUCCH resource allocation for MTC devices under coverage enhancement, in accordance with certain embodiments of the present invention.
  • the present invention provides techniques and apparatus for determining physical uplink control channel (PUCCH) resource for certain user equipments (e.g. low cost MTC UEs) .
  • PUCCH physical uplink control channel
  • FIGs. 1 through 9 Several exemplary embodiments of the present invention are described with reference to FIGs. 1 through 9. It is to be understood that the following invention provides various embodiments as examples for implementing different features of the present invention. Specific examples of components and arrangements are described in the following to simplify the present invention. These are, of course, merely examples and are not intended to be limiting. In addition, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various described embodiments and/or configurations.
  • FIG. 1 illustrates a schematic diagram of a wireless communications system according to certain embodiment of the present invention.
  • the wireless communications system 100 includes one or more fixed base units 110 and 111, forming one or more access networks 130 and 131 distributed over a geographical region.
  • the access network 130 and 131 may be a Universal Terrestrial Radio Access Network (UTRAN) in the WCDMA technology or an E-UTRAN in the Long Term Evolution (LTE) /LTE-Atechnology.
  • the base unit may also be referred to an access point, base station, Node-B, eNode-B (eNB) , or other terminologies used in the art.
  • one or more base stations are communicably coupled to a controller forming an access network that is communicably coupled to one or more core networks.
  • the mobile communication network 100 is an OFDM/OFDMA system comprising eNB 110 and eNB 111, and a plurality of UE 120 and UE 121.
  • each UE gets a downlink resource assignment, e.g., a set of downlink radio resources indicated in downlink control information (DCI) which is transmitted with a physical downlink control channel (PDCCH or EPDCCH) .
  • DCI downlink control information
  • PDSCH physical downlink control channel
  • UEs receive corresponding physical downlink shared channel (PDSCH) in the set of downlink radio resources.
  • UEs transmits DL HARQ-ACK with a physical uplink control channel (PUCCH) according to detection results of corresponding PDSCH.
  • PUCCH physical uplink control channel
  • the UE When a UE needs to send an uplink data block to base station, the UE gets a grant from the eNB that assigns a set of uplink radio resources, i.e. an uplink grant convey by a DCI. Thus, the UE transmits corresponding physical uplink shared channel (PUSCH) in the set of uplink radio resources, and eNB receives the PUSCH in the set of downlink radio resources. And then, eNB transmits UL HARQ-ACK with a physical hybrid-ARQ indicator channel (PHICH) according to detection results of the PUSCH.
  • PUSCH physical uplink shared channel
  • eNB receives the PUSCH in the set of downlink radio resources.
  • eNB transmits UL HARQ-ACK with a physical hybrid-ARQ indicator channel (PHICH) according to detection results of the PUSCH.
  • PHICH physical hybrid-ARQ indicator channel
  • one or more mobile stations 120 and 121 are connected wirelessly to base stations 110 and 111 for wireless service within a serving area, for example, a cell or within a cell sector.
  • the mobile station may also be called user equipment (UE) , a wireless communication device, terminal or some other terminologies.
  • UE user equipment
  • Mobile station 120 and 121 send uplink data to base stations 110 and 111 via uplink channel 140 and 141 in the time and/or frequency domain.
  • the serving base station 110 and 111 transmit downlink signals via a downlink channel 150 and 151.
  • the communication system utilizes Orthogonal Frequency Division Multiplexing Access (OFDMA) or a multi-carrier based architecture including Adaptive Modulation and Coding (AMC) on the downlink and next generation single-carrier (SC) based FDMA architecture for uplink transmissions.
  • SC based FDMA architectures include Interleaved FDMA (IFDMA) , Localized FDMA (LFDMA) , DFT-spread OFDM (DFT-SOFDM) with IFDMA or LFDMA.
  • IFDMA Interleaved FDMA
  • LFDMA Localized FDMA
  • DFT-SOFDM DFT-spread OFDM
  • remote units are served by assigning downlink or uplink radio resources that typically comprises a set of sub-carriers over one or more OFDM symbols.
  • Exemplary OFDMA based protocols include the developing LTE/LTE-A of the 3GPP standard and IEEE 802.16 standard.
  • the architecture may also include the use of spreading techniques such as multi-carrier CDMA (MC-CDMA) , multi-carrier direct sequence CDMA (MC-DS-CDMA) , Orthogonal Frequency and Code Division Multiplexing (OFCDM) with one or two dimensional spreading, or may be based on simpler time and/or frequency division multiplexing/multiple access techniques, or a combination of these various techniques.
  • MC-CDMA multi-carrier CDMA
  • MC-DS-CDMA multi-carrier direct sequence CDMA
  • OFDM Orthogonal Frequency and Code Division Multiplexing
  • communication system may utilize other cellular communication system protocols including, but not limited to, TDMA or direct sequence CDMA.
  • TDMA time division multiple access
  • CDMA direct sequence CDMA
  • low complexity is used to save device cost for improvement of market competitiveness.
  • a main low complexity technology is to reduce the bandwidth to 1.4 MHz for baseband and RF band.
  • All physical channel transmissions of MTC UEs are restricted within 6 contiguous PRBs.
  • the 6 contiguous PRBs can be called as a MTC band and there may be multiple MTC bands within system bandwidth.
  • Coverage enhancement is to provide a better coverage than normal coverage to enable MTC UEs to work under terrible application environment.
  • MCL absolute target maximum coupling loss
  • cross-subframe scheduling For low cost MTC UE, cross-subframe scheduling has been agreed, and cross-MTCband scheduling is also possible.
  • cross-subframe scheduling means PDCCH/EPDCCH and associated PDSCH are not transmitted within the same subframe.
  • Cross-MTCband scheduling means PDCCH/EPDCCH and associated PDSCH are not transmitted within the same MTC band.
  • 1ms retuning time may be required to switch radio frequency (RF) of MTC UEs from one MTC band for PDCCH/EPDCCH to another MTC band for PDSCH.
  • RF radio frequency
  • corresponding PDSCH may be transmitted in subframe n+1 for same-MTCband scheduling case or n+2 for cross-MTCband scheduling case.
  • the timing relationship between PDSCH and corresponding PUCCH is fixed, e.g. PUCCH is always transmitted in subframe n+4 assuming corresponding PDSCH is transmitted in subframe n in FDD systems.
  • the timing relationship between PUCCH and corresponding PDCCH/EPDCCH may be different for same-MTCband scheduling case (e.g. n+5) and cross-MTCband scheduling case (e.g. n+6) .
  • PUCCH resource collision may happen if reusing legacy PUCCH resource determination, i.e., PUCCH resource is determined based on the lowest control channel element (CCE/ECCE) index of corresponding PDCCH/EPDCCH transmission.
  • CCE/ECCE index in different subframes may correspond to the same PUCCH resource in a subframe for multiple MTC UEs.
  • PUCCH resources of the multiple MTC UEs collide.
  • one solution may be eNB handling with PDCCH/EPDCCH resource scheduling. For example, a CCE/ECCE shouldn’t be scheduled if PUCCH resource collision potentially happens, and the CCE/ECCE cannot be scheduled for non-MTC UE if non-MTC UE and MTC UE cannot share a resource region for PDCCH/EPDCCH resource scheduling.
  • the restriction on PDCCH/EPDCCH resource scheduling may result in a resource waste and enlarge the blocking probability.
  • Another solution is to determine PUCCH resource based on some parameters used for corresponding PDSCH transmission since the timing relationship between PUCCH and corresponding PDSCH is fixed. These parameters may be one or more of the following: MTC band index, the lowest PRB index and antenna port index used for PDSCH transmission.
  • PUCCH resource collision may still happen due to PUCCH repetition.
  • eNB handling with PDSCH resource scheduling may be feasible to avoid PUCCH resource collision.
  • a PRB which may potentially cause PUCCH resource collision can be scheduled for non-MTC UE, since non-MTC UE and MTC-UE can share a MTC band for PDSCH resource scheduling.
  • PDSCH resource scheduling is more flexible than PDCCH/EPDCCH resource scheduling, eNB handling with the former may be easier and better than the latter to avoid PUCCH resource collision.
  • PUCCH repetition is supported.
  • explicit PUCCH resource allocation is used for all PUCCH subframes except the first PUCCH subframe wherein implicit PUCCH resource determined based on the lowest CCE/ECCE index of corresponding PDCCH/EPDCCH transmission is used.
  • Explicit PUCCH resource allocation herein refers to that a PUCCH resource value is configured by a higher layer signaling, i.e. UE-specific radio resource control (RRC) signaling. This means eNB handling with explicit PUCCH resource allocation is directly used to avoid PUCCH resource collision.
  • RRC radio resource control
  • the explicit PUCCH resource allocation can be reused.
  • PUCCH resource allocation is still a problem for HARQ-ACK feedback of PDSCH before receiving a higher layer signaling used for explicit PUCCH resource configuration.
  • one solution may be to indicate an initial PUCCH resource value in MSG4 during a PRACH procedure since MSG4 is the first PDSCH requiring HARQ-ACK feedback during initial access.
  • the initial PUCCH resource is used until a reconfigured PUCCH resource value is indicated by a higher layer signaling.
  • Another solution is to apply implicit PUCCH resource determination until receiving an explicit PUCCH resource value.
  • the implicit PUCCH resource determination may be based on some parameters used for corresponding PDSCH transmission.
  • FIG. 2 illustrates an example of implicit PUCCH resource allocation for a MTC UE, comprising: receiving a PDSCH; determining corresponding PUCCH resource based on one or more following parameters used for the PDSCH transmission: MTC band index, the PRB index and antenna port index; and transmitting ACK/NACK of the PDSCH on the determined PUCCH resource.
  • the PUCCH resource herein means a logical resource, and PUCCH physical resource is determined based on the logical resource.
  • the method is used for a MTC UE under normal coverage.
  • the method is used for a MTC UE or a non-MTC UE under coverage enhancement.
  • PUCCH resource is implicitly determined based on MTC band index, the lowest PRB index and antenna port index used for corresponding PDSCH transmission according to following equation (1) and (2) .
  • Equation (1) is used for FDD systems
  • equation (2) is used for TDD systems.
  • multiple MTC bands for PDSCH correspond to a common PUCCH region as shown in FIG. 3.
  • the common PUCCH region is shared by all MTC UEs served by the multiple MTC bands.
  • Equation (1) and (2) it denotes the MTC band index used for PDSCH transmission,
  • the value of is a variable, and it is broadcasted in a system information block (SIB) dedicated for MTC UEs, and it is selected from a predefined set, e.g. ⁇ 1, 2, 4, 8, 16 ⁇ .
  • SIB system information block
  • an indicator of physical resource location of each allocated MTC band should be accompanying with the value of i.e., they are included in an information element (IE) .
  • IE information element
  • the physical resource location of MTC band can be flexibly scheduled by network, e.g. the starting PRB of MTC band may be any one PRB within system bandwidth.
  • the physical resource location of MTC band is predefined, e.g. system bandwidth is divided into multiple MTC bands according to a predefined rule.
  • the value of is a predefined value depending on the system bandwidth, and physical resource location of each MTC band is also predefined.
  • the system bandwidth is divided into multiple MTC bands according to a predefined rule, e.g. central carrier frequency of MTC band should be integral multiples of 100 kHz.
  • eNB may use one or several MTC bands within the multiple MTC bands for PDSCH transmission of MTC UEs.
  • FIG. 4 illustrates an example of MTC band partition within 10 MHz system bandwidth including 50 PRBs.
  • MTC bands are numbered from low frequency to high frequency.
  • the PRB 17 is included in MTC band k and MTC band k+1 in FIG. 4.
  • the number of MTC bands allocated by an eNB should depend on the number of MTC UEs connected to the eNB and traffic quantity of these MTC UEs. For example, a large number of MTC UEs need more MTC bands for data transmission.
  • One MTC band should be separately configured for DL data transmission and UL data transmission.
  • the ratio of the number of UL MTC bands to the number of DL MTC bands can be semi-statically adjusted to match actual traffic status of all connected MTC UEs, and its effect is similar to UL-DL configuration in TDD systems.
  • one MTC band should be separately configured for each physical channel. For example, PDCCH/EPDCCH and PDSCH may be transmitted within different MTC bands, and PUCCH and PUSCH may be transmitted within different MTC bands.
  • the value of is dynamically indicated in DCI.
  • a special DCI field is used to indicate the value of and the size of the DCI field depends on the value of e.g. 2 information bits indicate one from four MTC bands configured by higher layers.
  • the value of is semi-statically configured by higher layers.
  • the configuration of MTC band for PDSCH should include two types: common and dedicated, i.e. two IEs respectively for MTCBandForPDSCH-ConfigCommon and MTCBandForPDSCH-ConfigDedicated.
  • the initial configuration should be the common configuration broadcasted in a SIB dedicated for MTC UEs. And then, the initial configuration can be replaced by a dedicated configuration indicated in a higher layer signaling, e.g. UE-specific RRC signaling. In other words, a common configuration is used until a dedicated configuration is activated. In one example, the dedicated configuration may not be signaled, and the common configuration is always used.
  • Equation (1) and (2) it denotes the lowest PRB index in the first slot of corresponding PDSCH transmission within MTC band, i.e. In TDD systems, is the lowest PRB index in the first slot of corresponding adjacent PDSCH transmission within DL association set (as shown in table 1) . In other words, is the lowest PRB index in the first slot of corresponding PDSCH transmission in subframe n-k m , and k m is the smallest value in the DL association set K such that UE detects a PDSCH transmission within subframe (s) n-k m and k m ⁇ K, m 0, 1, L, M-1.
  • the method illustrated in FIG. 2 is used for a MTC UE or a non-MTC UE under coverage enhancement wherein most physical channels need to be repeated.
  • PDSCH repetition means a PDSCH is transmitted on multiple subframes. If frequency hopping is applied to reduce repetition number of PDSCH, the PRB (s) used for the PDSCH transmission may be different within the multiple subframes. In the case, the lowest PRB index denotes the physical location in the first slot of a certain subframe within the multiple subframes. In one example, the certain subframe is the first subframe within the multiple subframes. In another example, the certain subframe is the ending subframe within the multiple subframes.
  • Equation (1) and (2) it is determined from the antenna port used for corresponding PDSCH transmission as shown in table 2. And it is just used for PDSCH with DMRS-based transmission mode wherein PDSCH demodulation is based on DMRS. If the PDSCH is transmitted with CRS-based transmission mode wherein PDSCH demodulation is based on CRS, Introducing antenna port index into PUCCH resource determination is to avoid PUCCH resource collision for multi-user MIMO wherein the same PRB (s) are scheduled for multiple UEs.
  • N PUCCH in equation (1) and (2) , it denotes PUCCH resource starting offset configured by higher layers. Since one PUCCH region is shared by all connected MTC UEs, the value of N PUCCH should be indicated in a SIB dedicated for MTC UE. And UE-specific configuration on N PUCCH is unnecessary.
  • Equation (1) and (2) it denotes the total PRB number within multiple MTC bands for PDSCH transmission of MTC UEs in subframe n-k i in TDD systems.
  • the allocated number of MTC bands should be the same for each MTC subframe, i.e. If subframe n-k i can be scheduled for PDSCH transmission of MTC UEs, Otherwise, e.g. a special subframe with special subframe configuration 0 or 5 for normal downlink cyclic prefix (CP) , and a special subframe with special subframe configuration 0 or 4 or 7 for extended downlink CP.
  • CP normal downlink cyclic prefix
  • ⁇ ARO in equation (1) and (2) , it is determined from the HARQ-ACK resource offset field in the DCI format of the corresponding physical downlink control channel as shown in table 3.
  • the value of ⁇ ARO is used for PUCCH resource compression.
  • PUCCH resource is compressed within multiple PDSCH bands for FDD systems, and within multiple DL associated subframes for TDD systems.
  • ⁇ ARO is removed in equation (1) and (2) .
  • PUCCH resource is implicitly determined based on the lowest PRB index and the antenna port index used for corresponding PDSCH transmission according to following equation (3) and (4) .
  • Equation (3) is used for FDD systems
  • equation (4) is used for TDD systems.
  • each MTC band corresponds to a PUCCH region as shown in FIG. 5.
  • there are multiple PUCCH regions and each PUCCH region is shared by a group of MTC UEs sharing the same MTC band for PDSCH transmission.
  • N PUCCH and in equation (3) and (4) corresponding interpretation is same to that in above equation (1) and (2) .
  • subframe n-k i is a MTC subframe which can be scheduled for PDSCH transmission of MTC UEs. Otherwise,
  • each PDSCH band corresponds to one PUCCH region
  • the value of N PUCCH is configured accompanying with PDSCH band configuration, i.e. they are included in the same IE.
  • multiple MTC bands for PDSCH and corresponding N PUCCH are configured in a SIB dedicated for MTC UEs.
  • corresponding value of N PUCCH is used regardless of whether the MTC band is semi-statically or dynamically configured.
  • a MTC band for PDSCH and corresponding N PUCCH are configured by higher layers.
  • Configuration of the IE including MTC band for PDSCH and corresponding N PUCCH is similar to above description on configuration of MTC band for PDSCH, i.e. a common configuration and a dedicated configuration.
  • the common configuration is broadcasted in a SIB dedicated for MTC UEs, and the dedicated configuration is indicated in a higher layer signaling, e.g. UE-specific RRC signaling.
  • ⁇ ARO in equation (3) and (4) , it is determined from ARO field in DCI as shown in table 4.
  • the same PRB may correspond to different PRB indexes for different MTC UEs.
  • PUCCH resource collision may happen.
  • the value of ⁇ ARO can be used to adjust PUCCH resource to avoid the collision.
  • the value of ⁇ ARO can be further used to compress PUCCH resources within multiple DL associated subframe in time domain.
  • ⁇ ARO is removed in equation (3) and (4) .
  • PUCCH resource allocation is determined based on some parameters used for corresponding PDSCH transmission, PUCCH resource may be a problem for a PDCCH/EPDCCH without associated PDSCH if the PDCCH/EPDCCH requires a DL HARQ-ACK feedback, e.g. downlink semi-persistent scheduling (SPS) release.
  • SPS downlink semi-persistent scheduling
  • an invalid DCI field is used to indicate a PUCCH resource.
  • the TPC command for PUCCH field can be used as an index to one of the four PUCCH resource values configured by higher layers with the mapping as shown in table 5.
  • ACK/NACK of the PDSCH on the determined PUCCH resource in the step 230 further comprising: determining a PRB index used for PUCCH transmission based on the determined PUCCH resource; determining a MTC band used for PUCCH transmission; and transmitting the ACK/NACK in a certain PRB within the determined MTC band;
  • Legacy PUCCH is transmitted on two edges of the system bandwidth, and the allocated PRBs in the first slot and the second slot are mirrored.
  • the cross-slot frequency hopping on two edges of system bandwidth can generally achieve significant frequency diversity gain.
  • the frequency diversity gain achieved by cross-slot frequency hopping on two edges of MTC band may be very limited since one MTC band just comprises 6 contiguous PRBs.
  • cross-slot frequency hopping within MTC band may cause resource segmentation considering localized resource allocation for PUSCH. Therefore, a reasonable design for narrow band PUCCH of MTC UEs should be that the PRB used for PUCCH transmission is the same in the first slot and in the second slot, i.e. no cross-slot frequency hopping.
  • a PRB index used for PUCCH transmission is determined based on a PUCCH resource value n PUCCH and some parameters configured by higher layers according to following equation (5) and (6) . Equation (5) is used for a MTC UE under normal coverage, wherein mix of PUCCH formats 1/1a/1b and formats 2/2a/2b is supported. Equation (6) is used for a MTC UE or a non-MTC UE under coverage enhancement, wherein PUCCH formats 2/2a/2b are not supported.
  • RB resource block
  • the maximum number of available PUCCH resources in a PRB is The value of is broadcasted in a SIB dedicated for MTC UEs, and it is within the range of ⁇ 0, 1, ..., 7 ⁇ .
  • equation (5) it refers the number of PRBs that are available for PUCCH formats 2/2a/2b transmission in each slot.
  • the value of is broadcasted in a SIB dedicated for MTC UEs.
  • equation (5) it refers to the number of cyclic shift used for PUCCH formats 1/1a/1b in a PRB used for a mix of formats 1/1a/1b and 2/2a/2b.
  • the value of is broadcasted in a SIB dedicated for MTC UEs, and it is an integer multiple of No mixed resource block is present if At most one PRB in each slot supports a mix of formats 1/1a/1b and 2/2a/2b.
  • MTC band configured for PUCCH transmission
  • MTC band refers to the physical location within the MTC band, i.e. If no MTC band configured for PUCCH transmission, refers to the physical location within UL system bandwidth, i.e. Here, denotes the number of PRBs within UL system bandwidth.
  • a MTC band is semi-statically allocated by network for PUCCH transmission of a MTC UE, and the PRB index determined based on a PUCCH resource value n PUCCH refers to the physical location within the MTC band, i.e.
  • the semi-statically allocated MTC band is dedicated for PUCCH transmission, i.e. PUCCH and PUSCH may be transmitted on different MTC bands.
  • the semi-statically configured MTC band is shared by PUCCH and PUSCH of a MTC UE.
  • configuration of MTC band for PUCCH it is similar to above description of MTC band for PDSCH, i.e. common configuration broadcasted in a SIB and dedicated configuration indicated in a UE-specific RRC signaling.
  • signaling overhead for PUCCH resource related configuration can be reduced. For example, information bits of can be reduced to 3bits from 7bits, i.e. legacy range ⁇ 0, 1, ...., 98 ⁇ is reduced to ⁇ 0, 1, ..., 4 ⁇ .
  • Information bits of N PUCCH can be reduced to 8bits from 11bits, i.e. legacy range ⁇ 0, 1, ..., 2047 ⁇ is reduced to ⁇ 0, 1, ..., 215 ⁇ .
  • frequency hopping can be used to reduce repetition number for power consumption reduction. If a MTC band is configured for PUCCH, frequency hopping interval is in terms of MTC band, i.e. PUCCH is transmitted over multiple MTC bands. And the relative physical location of the PRB (i.e ) should be the same within the multiple MTC bands.
  • PUCCH is transmitted over two MTC bands as shown in FIG. 6, wherein is called as initial band and is called as hopping band. And PUCCH is transmitted in the same PRB in the two MTC bands.
  • the two MTC bands are configured by higher layers as initial band and hopping band respectively.
  • one MTC band is configured by higher layers as initial MTC band and hopping band is implicitly determined based on a predefined rule and initial band
  • the predefined rule for determining is based on mirror pattern according to equation (7) .
  • the predefined rule is based on a fixed interval according to equation (8) , wherein the fixed interval is Regarding in equation (7) and (8) , it denotes the number of MTC bands for PUCCH within UL system bandwidth. Similar to above description of MTC bands for PDSCH. The value of may be broadcasted in a SIB dedicated for MTC UEs, or a predefined value depending on UL system bandwidth.
  • a MTC band configured for PUCCH
  • a PRB index determined based on PUCCH resource denotes physical location of the PRB within UL system bandwidth, i.e.
  • a MTC band including the PRB is selected as RF band for PUCCH transmission.
  • the MTC band is selected from multiple predefined MTC bands, e.g. UL system bandwidth is divided into multiple MTC bands according to a predefined rule.
  • the predefined rule is that central carrier frequency of each MTC band should be integral multiples of 100kHz as illustrated in FIG. 4.
  • a single MTC band includes the PRB
  • the single MTC band is selected as RF band.
  • multiple MTC bands include the PRB
  • one of the multiple MTC bands is selected as RF band.
  • selecting one of the multiple MTC bands is up to UE implementation.
  • selecting one of the multiple MTC bands is based on a predefined rule.
  • the predefined rule may be selecting one with a smaller MTC band index, selecting one with a larger MTC band index, or selecting one with a smaller duplex distance in the subframe used for PUCCH transmission for a full-duplex UE in FDD systems.
  • frequency hopping interval may be in terms of PRB, i.e. PUCCH is transmitted over multiple PRBs.
  • PUCCH is transmitted over two PRBs as shown in FIG. 7, wherein is called as initial PRB and is called as hopping PRB.
  • initial PRB is determined based on PUCCH resource according to equation (5) or (6)
  • hopping PRB is implicitly determined based on a predefined rule and initial PRB
  • the predefined rule is based on mirror pattern according to equation (9) .
  • the predefined rule is based on a fixed interval according to equation (10) , wherein the fixed interval is Regarding in equation (9) and (10) , it denotes the number of PRB within UL system bandwidth.
  • FIG. 8 illustrates an example of explicit PUCCH allocation for a MTC UE under coverage enhancement, comprising: receiving an initial PUCCH resource value indicated in a DL MSG during a PRACH procedure; transmitting DL HARQ-ACK on the initial PUCCH resource; receiving a reconfigured PUCCH resource value indicated in a higher layer signaling; and transmitting DL ACK/NACK on the reconfigured PUCCH resource.
  • the purpose of triggering the PRACH procedure is for RRC connection setup when initial access or RRC connection re-setup when radio link failure.
  • the PRACH procedure comprises MSG1, MSG2, MSG3, and MSG4.
  • MSG1 is a PRACH preamble transmitted by a UE on a PRACH resource, wherein the PRACH preamble and the PRACH resource are randomly selected by the UE.
  • MSG2 is a RACH response (RAR) transmitted by eNB on PDSCH addressed to a RA-RNTI which is determined based on the selected PRACH resource.
  • RAR RACH response
  • PRACH preamble (s) successfully detected by eNB and corresponding information are transmitted, e.g. temporary C-RNTI, timing advance value, and UL grant resource of MSG3.
  • MSG3 is a PUSCH transmitted by the UE with the temporary C-RNTI, wherein UE ID is conveyed for contention resolution.
  • MSG4 is a PDSCH transmitted by eNB with contention resolution message to UE whose message is successfully received in MSG3. During the PRACH procedure, MSG4 is the first PDSCH requiring HARQ-ACK feedback.
  • the initial PUCCH resource value is signaled during the PRACH procedure and it is used until receiving a reconfigured PUCCH resource value.
  • the reconfigured PUCCH resource value is indicated in a UE-specific RRC signaling.
  • the reconfigured PUCCH resource value should replace the initial one.
  • eNB may not reconfigure PUCCH resource value, and the initial PUCCH resource value is always used.
  • the DL MSG is MSG4, i.e. the initial PUCCH value is indicated in MSG4. If the MSG4 is not successfully detected, the initial PUCCH resource value is not known and the NACK of MSG4 cannot be transmitted. Therefore, eNB cannot distinguish the NACK and DTX of MSG4. If MSG4 is successfully detected, the initial PUCCH resource value is known and the ACK of MSG4 can be transmitted. So, there is only ACK transmission on the initial PUCCH resource for MSG4. Based on the phenomenon, eNB can use an optimized algorithm to improve the ACK detection performance of MSG4, e.g. using energy information rather than phase information when performing demodulation.
  • the DL MSG is MSG2, i.e. the initial PUCCH resource value is indicated in MSG2. Regardless of whether MSG4 is successfully detected or not, the initial PUCCH resource value is known.
  • the NACK of MSG4 can be transmitted on the initial PUCCH resource.
  • the NACK and DTX of MSG4 can be distinguished, and corresponding retransmission strategies at eNB side may be different. For example, if DTX is detected by eNB, retransmission of physical downlink control channel associated with MSG4 may ensure a better detection performance than corresponding initial transmission, e.g. using a larger aggregation level or a larger repetition level.
  • an initial PUCCH repetition number is explicitly indicated in a DL MSG during a PRACH procedure, and the initial PUCCH repetition number is accompanying with PUCCH resource in the DL MSG.
  • the DL MSG is MSG4. In another example, the DL MSG is MSG2.
  • an initial PUCCH repetition number is implied by the repetition level of PRACH resource selected by the MTC UE.
  • a mapping table of PUCCH repetition number and PRACH repetition number is used to determine the initial PUCCH repetition number.
  • the mapping table may be specified in specification, or broadcasted in a SIB dedicated for MTC UEs.
  • the initial PUCCH repetition number indicated in a DL MSG during a PRACH procedure or implied by PRACH repetition level can be replaced by a reconfigured PUCCH repetition number.
  • the initial PUCCH repetition number is used until receiving a reconfigured PUCCH repetition number indicated in a UE-specific higher layer signaling.
  • the reconfigured PUCCH repetition number is accompanying with reconfigured PUCCH resource in the UE-specific higher layer signaling, i.e. they are included in an IE.
  • PUCCH repetition number and PUCCH resource value are separately reconfigured by higher layers.
  • FIG. 9 illustrates an example of combining implicit and explicit PUCCH resource allocation for a MTC UE or a non-MTC UE under coverage enhancement, comprising: determining PUCCH resource based on one or more following parameters used for corresponding PDSCH transmission: MTC band index, the lowest PRB index, and antenna port index; transmitting the ACK/NACK of corresponding PDSCH on the determined PUCCH resource; receiving a PUCCH resource value indicated in a higher layer signaling; and transmitting DL ACK/NACK on the indicated PUCCH resource.
  • implicit PUCCH resource allocation is applied until receiving a PUCCH resource value configured by UE-specific RRC signaling.
  • the implicit PUCCH resource allocation refers to the method illustrated in FIG. 2, i.e. determining PUCCH resource based on some parameters used for corresponding PDSCH transmission. Due to PUCCH repetition, PUCCH resource collision may happen when applying the implicit PUCCH resource allocation, e.g. the same PRB is scheduled for PDSCH transmission of different MTC UEs in different subframes. Fortunately, eNB handling with PDSCH resource scheduling may be feasible to avoid PUCCH resource collision, e.g. a PRB which may potentially cause PUCCH resource collision is scheduled for non-MTC UE.
  • IC integrated circuit
  • the IC may comprise a general purpose processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute codes or instructions that reside within the IC, outside of the IC, or both.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module e.g., including executable instructions and related data
  • other data may reside in a data memory such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of computer-readable storage medium known in the art.
  • a sample storage medium may be coupled to a machine such as, for example, a computer/processor (which may be referred to herein, for convenience, as a “processor” ) such that the processor can read information (e.g., code) from and write information to the storage medium.
  • a sample storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in user equipment.
  • the processor and the storage medium may reside as discrete components in user equipment.
  • any suitable computer-program product may comprise a computer-readable medium comprising codes relating to one or more of the aspects of the invention.
  • a computer program product may comprise packaging materials.

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Abstract

L'invention a trait à un procédé d'attribution d'une ressource PUCCH pour un dispositif MTC, et ce procédé comprend : la réception d'un canal de données de liaison descendante physique (PDSCH) ; la détermination d'une ressource de canal de commande de liaison montante physique (PUCCH) correspondante sur la base d'un ou plusieurs paramètres servant à la transmission PDSCH parmi l'indice de bande MTC, l'indice de bloc de ressource physique (PRB) le plus faible et l'indice de port d'antenne ; et la transmission d'un ACK/NACK du PDSCH sur la ressource PUCCH déterminée. Un procédé d'attribution d'une ressource PUCCH pour un dispositif MTC est également décrit, et ce procédé implique : la réception d'une valeur de ressource PUCCH initiale indiquée dans un MSG DL au cours d'une procédure PRACH ; la transmission d'un PUCCH sur la ressource PUCCH initiale ; la réception d'une valeur de ressource PUCCH reconfigurée indiquée dans une signalisation de couche supérieure ; et la transmission du PUCCH sur la ressource PUCCH reconfigurée.
PCT/CN2015/076305 2015-04-10 2015-04-10 Procédés et appareil destinés à l'attribution d'une ressource pucch dans une mtc WO2016161629A1 (fr)

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