US9271282B2 - Method of control signaling transmission and reception for user equipment in a LTE communication system - Google Patents

Method of control signaling transmission and reception for user equipment in a LTE communication system Download PDF

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US9271282B2
US9271282B2 US14/127,792 US201314127792A US9271282B2 US 9271282 B2 US9271282 B2 US 9271282B2 US 201314127792 A US201314127792 A US 201314127792A US 9271282 B2 US9271282 B2 US 9271282B2
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transmission
epdcch
indication
prb
epdcch transmission
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US20150195817A1 (en
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Satha Sathananthan
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NEC Corp
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NEC Corp
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    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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 signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H04W72/1284—

Definitions

  • the invention relates generally to wireless communications, and in particular to methods and apparatus for allocating resources for control signaling transmissions within a wireless network.
  • Widely deployed wireless voice and data communications systems include multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g. bandwidth and transmit power). Examples include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, 3GPP Long Term Evolution (LTE) systems, and orthogonal frequency division multiple access (OFDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • LTE 3GPP Long Term Evolution
  • OFDMA orthogonal frequency division multiple access
  • a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals, i.e. user equipment (UE) apparatus.
  • UE user equipment
  • Each UE receives communications from one or more base stations via a downlink and sends communications back to the base station via an uplink.
  • the communications link may be established via a single-in-single-out (SISO), multiple-in-single-out (MISO) or a multiple-in-multiple-out (MIMO) system.
  • SISO single-in-single-out
  • MISO multiple-in-single-out
  • MIMO multiple-in-multiple-out
  • a control signaling channel is generally used for allocation of transmission resources to the UEs sharing the wireless radio spectrum, as well as for other configuration, operations and signaling purposes.
  • An example of a control signaling channel is the physical downlink control channel (PDCCH) defined within the 3GPP LTE specifications.
  • RAN1 Radio Layer 1
  • ePDCCH enhanced PDCCH
  • Some aspects are directed to addressing some of the above requirements for the ePDCCH, within the framework agreed by RAN1.
  • 3GPP RAN1 has agreed that ePDCCH shall be multiplexed with the physical downlink shared channel (PDSCH) in a pure frequency division multiplexing (FDM) manner, that ePDCCH shall occupy a physical resource block (PRB) pair and shall not be multiplexed with PDSCH within a PRB-pair.
  • PDSCH physical downlink shared channel
  • FDM frequency division multiplexing
  • a particular object of some aspects is therefore to provide an effective and efficient method for a base station to provide a PRB indication to a UE, in order to notify the UE of the allocations of PRB-pairs for ePDCCH transmission.
  • a related problem is that of enabling the UE to identify and demultiplex relevant signaling information received within the ePDCCH.
  • the legacy LTE standards provide for ‘blind decoding’ of signaling by the UE, which conducts a search of a defined PDCCH search space in order to identify signaling intended for the UE.
  • the legacy PDCCH search space design is based on control channel elements (CCE) and aggregation levels (AL).
  • CCE control channel elements
  • AAL aggregation levels
  • the legacy PDCCH design is a well-proven technique which provides flexible and efficient transmission of control information. It is therefore desirable that an enhanced design for use with the ePDCCH build on the success of the legacy design.
  • the ePDCCH is transmitted via an enhanced CCE (eCCE) data structure, or via an aggregation of multiple eCCEs. It is therefore logical that the eCCE be a basic unit of the ePDCCH search space construction. However, it remains to define a search space design in detail, including specifying the composite eCCEs, supported aggregation levels, and procedures enabling blind decoding by the UE of Downlink Control Information (DCI) messages carried within eCCEs.
  • DCI Downlink Control Information
  • a further object of some aspects is to provide an ePDCCH search space design and associated methods of blind decoding, addressing one or more of the above desirable factors and features.
  • the present invention have been made to solve the problem like this, and an object thereof is to provide a method implemented in a base station, a user equipment (UE) and a wireless communications system; and a base station, a user equipment (UE) and a wireless communications system, capable of improving the control channel capacity and capabilities.
  • UE user equipment
  • UE user equipment
  • a method implemented in a base station used in a wireless communications system includes:
  • ePDCCH enhanced physical downlink control channel
  • a method implemented in a user equipment (UE) used in a wireless communications system includes:
  • ePDCCH enhanced physical downlink control channel
  • a method implemented in a wireless communications system includes:
  • ePDCCH enhanced physical downlink control channel
  • a base station used in a wireless communications system includes:
  • a transmitter to transmit to a user equipment (UE) an indication of a type of enhanced physical downlink control channel (ePDCCH) transmission, and an indication of the number of physical resource block (PRB) pairs allocated for the ePDCCH transmission,
  • UE user equipment
  • ePDCCH enhanced physical downlink control channel
  • PRB physical resource block
  • ePDCCH transmission includes either localized transmission or distributed transmission
  • a user equipment (UE) used in a wireless communications system the UE includes:
  • a receiver to receive from a base station an indication of a type of enhanced physical downlink control channel (ePDCCH) transmission, and an indication of the number of physical resource block (PRB) pairs allocated for the ePDCCH transmission,
  • ePDCCH enhanced physical downlink control channel
  • PRB physical resource block
  • ePDCCH transmission includes either localized transmission or distributed transmission
  • a wireless communications system includes:
  • a base station to transmit an indication of a type of enhanced physical downlink control channel (ePDCCH) transmission, and an indication of the number of physical resource block (PRB) pairs allocated for the ePDCCH transmission;
  • ePDCCH enhanced physical downlink control channel
  • PRB physical resource block
  • UE user equipment
  • ePDCCH transmission includes either localized transmission or distributed transmission
  • a method implemented in a base station used in a wireless communications system includes:
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a method implemented in a user equipment (UE) used in a wireless communications system includes:
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a method implemented in a wireless communications system includes:
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a base station used in a wireless communications system includes:
  • a transmitter to transmit, to a user equipment (UE), Y offset,k LT and P k LT ,
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a user equipment (UE) used in a wireless communications system the UE includes:
  • a receiver to receive, from a basestation, Y offset,k LT and P k LT ,
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a wireless communications system includes:
  • a base station to transmit Y offset,k LT and P k LT ;
  • UE user equipment
  • Y offset,k LT is a signaling parameter to determine a second offset Y k LT for a location of the physical resource block (PRB) pairs allocated for localized enhanced physical downlink control channel (ePDCCH) transmission in a k-th subframe
  • PRB physical resource block
  • a method implemented in a base station used in a wireless communications system includes:
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • a method implemented in a user equipment (UE) used in a wireless communications system includes:
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • a method implemented in a wireless communications system includes:
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • a base station used in a wireless communications system includes:
  • a transmitter to transmit P k DT to a user equipment (UE)
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • a user equipment (UE) used in a wireless communications system the UE includes:
  • a receiver to receive P k DT from a base station
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • a wireless communications system includes:
  • UE user equipment
  • P k DT is a signaling parameter to indicate the number of physical resource block (PRB) pairs allocated for distributed enhanced physical downlink control channel (ePDCCH) transmission in k-th subframe.
  • PRB physical resource block
  • One aspect provides a method for identifying resources allocated for enhanced Physical Downlink Control Channel (ePDCCH) transmissions from a base station, the method includes:
  • PDSCH Physical Downlink Shared Channel
  • UE User Equipment
  • the radio transmission data unit is a subframe
  • the resources reserved for ePDCCH transmission include one or more Physical Resource Block (PRB) pairs within the subframe.
  • the resources reserved for ePDCCH transmission may include at least two PRB pairs occupying adjacent groups of frequency subcarriers within the subframe.
  • PRB Physical Resource Block
  • Information indicative of the position within the subframe may include information indicative of an offset value, and information indicative of the quantity of the reserved resources includes information indicative of a number of the reserved PRB pairs.
  • the information indicative of an offset value may identify an initial PRB pair of the at least two PRB pairs.
  • the information indicative of an offset value includes a dynamic offset value, e.g. a position of the initial PRB pair relative to a predetermined static offset value within the subframe, which identifies a position of the initial PRB pair within the subframe.
  • a static offset value may be predetermined to provide Inter-Cell Interference Coordination (ICIC) with one or more neighbouring radio cells.
  • ICIC Inter-Cell Interference Coordination
  • resources reserved for ePDCCH transmission include at least two PRB pairs occupying non-adjacent groups of frequency subcarriers within the subframe.
  • a predetermined frequency subcarrier interval may be provided between successive PRB pairs of the at least two PRB pairs.
  • the predetermined frequency subcarrier interval may be a uniform frequency interval.
  • Information indicative of the quantity of the reserved resources may include information indicative of a number of the reserved PRB pairs.
  • the reserved resources may be characterised by the position within the subframe of an initial pair of the at least two PRB pairs, which in some embodiments can be a predetermined static offset value within the subframe selected to provide ICIC with one or more neighbouring radio cells.
  • the predetermined signaling mechanism includes a Downlink Control Information (DCI) message transmitted in a common search space of a legacy PDCCH channel.
  • the predetermined signaling mechanism may include a message transmitted via an enhanced implementation of a Physical Control Format Indicator Channel (PCFICH).
  • PCFICH Physical Control Format Indicator Channel
  • the predetermined signaling mechanism may also, or instead, include Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the step of reserving the resources for ePDCCH transmissions may include reserving resources in accordance with a selected reservation scheme within a predetermined configuration table.
  • Another aspect provides an apparatus at a base station configured to identify resources allocated for enhanced Physical Downlink Control Channel (ePDCCH) transmissions, the apparatus includes:
  • a resource reservation processor configured for reserving resources for ePDCCH transmissions from within resources generally configured for Physical Downlink Shared Channel (PDSCH) transmissions, wherein the reserved resources are characterised by a position within a radio transmission data unit and a quantity of the reserved resources;
  • PDSCH Physical Downlink Shared Channel
  • a resource reservation signaling processor configured to construct a message including information indicative of the position within the radio transmission data unit and/or information indicative of the quantity of the reserved resources to a User Equipment (UE) apparatus via a predetermined signaling mechanism;
  • a transmitter for transmitting the message constructed by the resource reservation signaling processor.
  • the radio transmission data unit may be a subframe, and the resource reservation processor may be configured to reserve resources of ePDCCH transmissions which include one or more Physical Resource Block (PRB) pairs within the subframe.
  • PRB Physical Resource Block
  • the resources reserved for ePDCCH transmission include at least two PRB pairs occupying adjacent groups of frequency subcarriers within the subframe, and the resource reservation signaling processor is configured to construct a message including information indicative of an offset value of an initial PRB pair of the at least two PRB pairs, and information indicative of a number of the reserved PRB pairs.
  • the resources reserved for ePDCCH transmission include at least two PRB pairs occupying non-adjacent groups of frequency subcarriers within the subframe, and the resource reservation signaling processor is configured to construct a message including information indicative of a number of the reserved PRB pairs.
  • the resources reserved for ePDCCH transmission may include at least two PRB pairs occupying adjacent groups of frequency subcarriers within the subframe, and at least two PRB pairs occupying non-adjacent groups of frequency subcarriers within the subframe, and wherein the resource reservation signaling processor is configured to construct a message includes:
  • the transmitter is configured to transmit the message constructed by the resource reservation signaling processor within a Downlink Control Information (DCI) message transmitted in a common search space of a legacy PDCCH channel.
  • DCI Downlink Control Information
  • the transmitter may be configured to transmit the message constructed by the resource reservation signaling processor via an enhanced implementation of a Physical Control Format Indicator channel (PCFICH).
  • PCFICH Physical Control Format Indicator channel
  • the transmitter may be configured to transmit the message constructed by the resource reservation signaling processor via Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the apparatus may further includes a memory storing a configuration table including predefined resource reservations for ePDCCH transmissions, wherein the resource reservation signaling processor is configured to construct a message including information indicative of an entry within the configuration table corresponding with a selected resource reservation.
  • UE User Equipment
  • ePDCCH Physical Downlink Control Channel
  • a receiver configured to receive, via a predetermined signaling mechanism, a message including information indicative of a position within the radio transmission unit of the resources allocated for ePDCCH transmissions, and a quantity of the reserved resources;
  • a resource location processor configured to locate the resources reserved for ePDCCH transmissions from within resources generally configured for Physical Downlink Shared Channel (PDCCH) transmissions within the radio transmission data unit, in accordance with the information in the received message.
  • PDCH Physical Downlink Shared Channel
  • the radio transmission data unit is a subframe
  • the resources reserved for ePDCCH transmission include one or more PRB pairs within the subframe
  • the resource location processor is configured to locate the reserved PRB pairs within the subframe.
  • the resources reserved for ePDCCH transmission may include at least two PRB pairs, which may occupy adjacent groups of frequency subcarriers within the subframe, and/or may occupy non-adjacent groups of frequency subcarriers within the subframe.
  • the receiver is configured to receive resource allocation signaling messages via a predetermined signaling mechanism including one or more of:
  • DCI Downlink Control Information
  • PCFICH Physical Control Format Indicator Channel
  • RRC Radio Resource Control
  • the UE apparatus may further include a memory for storing a configuration table including predefined resource reservations for ePDCCH transmissions, wherein:
  • the receiver is configured to receive a message including information indicative of an entry within the configuration table
  • the resource location processor is configured to locate the resources reserved of ePDCCH transmissions based upon the contents of the entry in the configuration table corresponding with the information in the received message.
  • Another aspect provides a method in a wireless device includes:
  • the predetermined search space is selected from a set of search spaces constructed so as to provide scalability with a number of the control channel structures, in combination with a low blocking probability of access to the control information structure due to contention with other wireless devices.
  • the method further includes decoding, by the wireless device, of contents of the control information structure.
  • the predetermined search space may be selected from the set of search spaces according to an algorithm which depends upon one or more of a wireless device identifier, a wireless base station identifier, and a subframe index.
  • the predetermined search space corresponds with an associated antenna port of the wireless device.
  • the predetermined search space may include a plurality of aggregation levels, which may be selected from a group including one, two, four and eight.
  • the plurality of control channel structures is transmitted within the signal subframe via one or more Physical Resource Block (PRB) pairs.
  • PRB Physical Resource Block
  • the one or more PRB pairs may include a single PRB pair, the plurality of control channel structures may include two control channel structures, and the predetermined search space may include one or two aggregation levels.
  • the plurality of control channel structures may include four control channel structures, and the predetermined search space may include one, two or four aggregation levels.
  • the one or more PRB pairs may include a plurality of PRB pairs, the plurality of control channel structures may include two control channel structures and the predetermined search space may include one, two or four aggregation levels. Alternatively, the plurality of control channel structures may include four control channel structures, and the predetermined search space may include one, two, four or eight aggregation levels.
  • N eCCE is a number of the plurality of control channel structures
  • k is a subframe index
  • Y k mod N eCCE is an index determining the selected search space
  • a and D are parameters selected such that Y k represents a pseudo-random sequence with desired spectral properties
  • Y ⁇ 1 is a seed value derived from one or more of a wireless device identifier and a wireless base station identifier.
  • the one or more PRB pairs may include at least two PRB pairs occupying adjacent groups of frequency subcarriers within the subframe, or may include at least two PRB pairs occupying non-adjacent groups of frequency subcarriers within the subframe. There may be a uniform predetermined frequency subcarrier interval between successive PRB pairs of the at least two PRB pairs.
  • a wireless User Equipment (UE) apparatus includes:
  • a receiver operable to receive a signal subframe transmitted by a wireless base station
  • a communications processor operably associated with the receiver and configured to:
  • the communications processor is further configured to decode contents of the control information structure.
  • the communications processor may be configured to select the predetermined search space from the set of search spaces according to an algorithm which depends upon one or more of a wireless device identifier, a wireless base station identifier, and a subframe index.
  • Embodiments of the wireless UE apparatus further include a plurality of antenna ports, wherein the communications processor is configured to associate the predetermined search space with one of the antenna ports.
  • a still further aspect provides an apparatus in a wireless base station for communicating with a plurality of wireless devices, the apparatus includes:
  • a transmitter operable to transmit a signal subframe to the wireless device
  • a communications processor operably associated with the transmitter and configured to:
  • the communications processor may be configured to select the predetermined search space from the set of search spaces according to an algorithm which depends upon one or more of a destination wireless device identifier, a wireless base station identifier, and a subframe index.
  • the plurality of wireless devices may each include a plurality of antenna ports, wherein the communications processor is configured to associate the predetermined search space with one of the antenna ports of a destination wireless device, and to operate the transmitter to direct transmission of the signal subframe to the associated antenna port.
  • FIG. 1 is a schematic diagram illustrating an exemplary wireless communications system supporting signaling and data transmissions between an enhanced Node B (eNB) base station and an LTE-based User Equipment (UE) 104 ;
  • eNB enhanced Node B
  • UE User Equipment
  • FIG. 2 is a schematic diagram illustrating indications of ePDCCH PRB-pairs
  • FIG. 3 is a schematic diagram illustrating two types of ePDCCH resources satisfying requirements for localized and distributed ePDCCH transmission;
  • FIG. 4 shows an example of frequency domain ICIC for ePDCCH
  • FIG. 5 illustrates a generalized signaling structure
  • FIG. 6 illustrates simplified signaling
  • FIG. 7 is a schematic diagram illustrating determination of localized ePDCCH transmission
  • FIG. 8 is a schematic diagram illustrating determination of distributed ePDCCH transmission
  • FIG. 9 is a flowchart illustrating overall procedures of ePDCCH transmission
  • FIG. 10 illustrates an ePDCCH search space design
  • FIG. 11 illustrates another ePDCCH search space design
  • FIG. 12 is a flowchart illustrating a control signaling process within a wireless network, including blind decoding of a DCI within an ePDCCH by a UE.
  • FIG. 1 is a schematic diagram 100 illustrating an exemplary wireless communications system supporting signaling and data transmissions between an enhanced Node B (eNB) base station 102 and an LTE-based User Equipment (UE) 104 .
  • eNB enhanced Node B
  • UE User Equipment
  • Transmissions from the eNB 102 to the UE 104 are via a downlink (DL) channel 106
  • DL downlink
  • UL uplink
  • the eNB 102 and UE 104 include hardware and/or software processing entities 110 , 112 configured to implement allocation, transmission and reception of an enhanced Physical Downlink Control Channel (ePDCCH) which is multiplexed in a pure FDM manner with a Physical Downlink Shared Channel (PDSCH) in a data region of transmitted LTE subframes.
  • ePDCCH enhanced Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • this multiplexing includes allocating resources which are generally configured for the PDSCH, to be used instead for ePDCCH transmissions.
  • the ePDCCH resources are reserved by the ePDCCH entity 110 of the eNB 102 , which is able to select the best PRB resources based on channel state information (CSI), e.g. to improve ePDCCH performance by frequency-selective scheduling gain.
  • CSI channel state information
  • a signaling mechanism is required in order to communicate the ePDCCH resource allocations from the eNB 102 to a UE 104 .
  • a signaling mechanism will enable allocations to change between subframes. A suitable design of a signaling mechanism will now be described with reference to FIGS. 7 and 8 .
  • the ePDCCH be transmitted within Physical Resource Block (PRB) pairs, which may be allocated according to either a localized or distributed scheme as illustrated in FIG. 2 .
  • PRB Physical Resource Block
  • the ePDCCH PRB-pairs are reserved in a contiguous block 204 of adjacent groups of frequency subcarriers within the subframe
  • the ePDCCH PRB pairs are reserved in non-adjacent groups 208 of frequency subcarriers within the subframe.
  • the non-adjacent groups 208 are spaced apart by a predetermined subcarrier frequency interval. This may be, for example, a uniform frequency interval, or a non-uniform interval.
  • FIG. 3 is a schematic diagram 300 illustrating two types of ePDCCH resources satisfying the above requirements for localized and distributed ePDCCH transmission:
  • the locations of ePDCCH PRBs are determined by parameters X1/Y1 303 / 305 (for Type A 301 ) and X2 304 (for Type B 302 ).
  • the parameters X1/X2 303 / 304 define an offset within the subframe, which could be adapted, for example, to provide frequency domain inter-cell interference control (ICIC) among neighbouring cells for ePDCCH.
  • IOC frequency domain inter-cell interference control
  • FIG. 4 An exemplary frequency domain ICIC for ePDCCH is illustrated in FIG. 4 , for a HetNet deployment scenario 400 in which a pico-cell 404 is deployed within a macro-cell 402 configured with an Almost Blank Subframe (ABS) 406 .
  • the pico-cell 404 is configured with subframe 408 .
  • the macro- and pico-cell subframes 406 , 408 each have allocated an ePDCCH scheduling window 410 , 412 .
  • These windows 410 , 412 are non-overlapping to minimise ICIC, and their offsets within the subframes 406 , 408 are specified by parameters X1_macro and X2_pico respectively.
  • the Type A PRB-pair groups 414 , 416 reserved for the respective ePDCCH allocations are identified by the further offset parameters Y1_macro and Y2_pico. These parameters may be varies by the macro and pico eNBs according to requirements, without concern of increased ICIC between the cells.
  • the parameters X1 and X2 may be defined based on Cell_ID and/or subframe index. Furthermore, X1 and X2 could be same for Type A and Type B allocations if Type A and Type B are transmitted in the same PRB-pairs and both are defined based on Cell_ID and/or subframe index. According to some examples, X1 and X2 are defined as an offset number of PRBs. In examples, offset parameter Y1 305 determines an exact location of a first PRB-pair used for ePDCCH (Type A 301 ) when used in combination with offset X1. The parameter Y1 may be communicated via a signaling parameter (e.g. Yoffset). According to some examples, Y1 is defined as an offset number of PRBs.
  • RBG Resource Block Group
  • a predetermined fixed spacing is used between ePDCCH PRB-pairs with Type B allocation 302 , as indicated by the parameter S in FIG. 3 .
  • the spacing S may be, e.g., implicitly defined in specifications based on system bandwidth, number of allocated PRB-pairs for ePDCCH distributed transmission, and so forth.
  • FIG. 5 illustrates a generalized signaling structure 500 , extending the fixed structure 300 , which allows for allocation on only one Type A set 301 , and one Type B set 302 .
  • a list of set allocations is defined, each of which may conform to either Type A or Type B.
  • the list contains data structures including:
  • the allocation may change dynamically from subframe to subframe.
  • it includes the following number of bits, which could be dependent on system bandwidth:
  • This signaling mechanism enables an eNB 102 to dynamically indicate the needed/allocated resources for transmitting both localized and distributed ePDCCH from subframe to subframe.
  • the signaling may be transmitted to the UE 104 by the following methods:
  • the signaling is transmitted as cell specific or UE specific, and received by UEs 104 supporting ePDCCH features.
  • the entity 112 of the UE 104 is configured to simply assume that if PRB-pairs are indicated for ePDCCH, they are not available for PDSCH transmission. This minimizes reserved ePDCCH resources since only needed ePDCCH resources are indicated. This improves resource utilisation for ePDCCH.
  • FIG. 6 illustrates simplified signaling 600 , according to the above-described example, and allocating one set 601 for localized ePDCCH (Type A) transmission and one set 602 for distributed transmission (Type B).
  • reduction of the signaling overhead may be achieved by employing a pre-defined configuration table, e.g. as illustrated in Table 1.
  • This table shows an example of a configuration table for PRB indication to a UE 104 using 5 bits i.e. allowing for a maximum of 32 configurations, wherein 24 configurations are defined and 8 configurations are reserved in this exemplary case.
  • the configuration table may be extended in examples, to cover a different number of bits according to system bandwidth.
  • the search space for subframe k, with aggregation levels L is dependent upon UE ID/Cell ID and/or the subframe index.
  • each set of search space candidates 1100 , 1200 has been constructed so as to provide scalability with the number of allocated PRB-pairs, in combination with a low blocking probability when different search spaces from the set are in use by different UEs within a single geographic area.
  • the search spaces 1000 , 1100 shown in FIG. 10 and FIG. 11 are designed to support antenna port association with minimal UE implementation complexity, and reduced blocking probability.
  • PR pseudo-random
  • each search space may be associated with a specific antenna port, such that the initial eCCE index used for blind decoding is uniquely associated with a corresponding antenna port, in order to simplify UE implementation. Examples having these properties will now be described in greater detail.
  • each eCCE within the composite eCCEs is allocated an index, commencing at zero, as shown 1010 , 1110 in the lower portion of each chart 1000 , 1100 .
  • the search space 1002 - 1008 , 1102 - 1108 , along with the corresponding antenna port, defined for each UE within each subframe may be identified according to an algorithm, an example of which is described in greater detail below.
  • the search space (S k (L) ) shown in FIG. 10 and FIG. 11 has the following properties:
  • the parameter Y k defines the start of eCCE index or antenna port number and Y k ⁇ 0,1,2,3 ⁇ .
  • Y k is determined according to a PR algorithm based upon a UE identifier, a cell identifier and/or the subframe index k, in order to distribute the search space allocation uniformly around UEs over space and time.
  • search space 1002 is for illustrative purposes only. More generally, suitable sets of search spaces 1000 , 1100 are illustrated in FIGS. 10 and 11 , while even more generally these search spaces are themselves illustrative of the principle, which is to provide scalability of the search space with the number of allocated PRB-pairs, in combination with a low blocking probability at each UE.
  • the configuration table may be extended in embodiments, to support either localized ePDCCH transmission, as illustrated in Table 2, or distributed ePDCCH transmission, as illustrated in Table 3.
  • the tables e.g. as exemplified by Tables 2 and 3, can be stored in memory of the eNB 102 and UE 104 , such that a record corresponding with the configuration may be identified by a table indexing or look-up procedure.
  • the ePDCCH PRB-pairs may be determined from signaling contents as described below, wherein the following parameters are defined:
  • Determination of localized ePDCCH transmission (Type A) is illustrated in FIG. 7 .
  • N PRB ER denotes the size of the ePDCCH region in terms of PRBs, and may be based either on the system bandwidth, or be defined as a predetermined fixed value for all system bandwidths.
  • N PRB ER could be defined as either a sub-band size or twice the sub-band size defined for CSI reporting mode PUSCH 3-1.
  • N ER is the number of ePDCCH regions, given by:
  • N ER ⁇ N PRB DL N PRB ER ⁇
  • Determination of distributed ePDCCH transmission (Type B) is illustrated in FIG. 8 in an embodiment in which a uniform frequency spacing is employed.
  • the location of the PRB-pairs for distributed ePDCCH transmission in the k-th subframe is given in this embodiment by:
  • X k DT ( N ID cell +k )mod N cons
  • N cons is a fixed value defined in the specification to provide non-overlapping distributed ePDCCH transmission among neighbor cells and 0 ⁇ N cons ⁇ N PRB DL .
  • one of the dynamic configurations as defined, for example, in Table 3 may be used for resource allocations for common search space within the ePDCCH. In such embodiments, one of the following methods could be considered to determine the configuration by the UE:
  • the flowchart 900 illustrates a method as conducted by a wireless base station (i.e. eNB) in communication with a wireless device (i.e. UE).
  • a wireless base station i.e. eNB
  • UE wireless device
  • the eNB reserves resources, i.e. PRB-pairs, within the data region of a subframe for ePDCCH allocation.
  • the eNB transmits information indicative of the location of the reserved resources to the UE.
  • the information may include, for example, one or more of:
  • the UE receives the transmitted information, and uses it to determine the location(s) of PRB-pairs reserved for ePDCCH allocations. Thereafter, at step 908 , the UE is able to access the ePDCCH using the determined location(s).
  • an eCCE is the minimum unit for assigning a DCI on the ePDCCH, and DCI multiplexing for the ePDCCH is based on the eCCE structure. It would be desirable to have eCCE size similar to that of the legacy CCE, i.e. to define the eCCE size to be around 36 Resource Elements (REs), in order to inherit the design of the legacy PDCCH. However, it is not possible to have a common eCCE size or to have the same number of eCCEs in all subframes and PRB-pairs. For example, on a given PRB pair, the number of available REs for ePDCCH transmission can vary significantly depending on factors including:
  • a search space design, and associated blind decoding method, are therefore required which can operate efficiently in the presence of varying eCCE size, and number of eCCE subframes.
  • the ePDCCH is transmitted via an eCCE, or an aggregation of multiple eCCEs, whereby the eCCE is the basic unit of ePDCCH search space construction.
  • the main object of the search space design is to specify procedures for a UE to blindly decode DCIs within the ePDCCH, after construction of composite eCCEs. As previously noted, the following factors are to be considered in defining a suitable ePDCCH search space:
  • search space design principles set out below are applicable for both localized and distributed transmission:
  • PRB-pairs for ePDCCH are selected by the eNB and are indicated to UE.
  • the PRB selection and indication procedure may be conducted, for example, as described above with reference to FIGS. 1 to 9 .
  • the UE knows the locations of ePDCCH PRB-pairs.
  • M k represents the number of ePDCCH PRB-pairs configured in the k-th sub-frame.
  • the value of M k may change from subframe to subframe depending on the resources required for ePDCCH transmission.
  • the UE will also know the position of ePDCCH signals received in the subframe, based upon definitions of the enhanced Resource Element Group (eREG) and eCCE set out in the relevant 3GPP specifications.
  • the UE is thus able to form composite eCCEs by extracting the received signals in the corresponding positions of the ePDCCH REs.
  • eREG enhanced Resource Element Group
  • the number of candidate location for DCI blind decoding depends on the number of eCCEs per PRB-pair (defined as N eCCE ), the number of supported aggregation levels (defined as L k ) and the number of ePDCCH PRB-pairs (defined as M k ).
  • the candidate search space (S k (L) ) scales with the number of PRB-pairs allocated for ePDCCH. This provides more flexibility for the network for scheduling and capacity handling.
  • the resulting increased number of blind decoding attempts required by the UE may be limited by 3GPP specifications to a predetermined maximum number of PRB-pairs monitored by a UE.
  • Table 5 illustrates the number of search space candidates for a UE configured to monitor 4 PRB-pairs for ePDCCH in a UE-specific search space (USS).
  • the flowchart 1200 illustrates a method as conducted by a wireless base station (i.e. eNB) in communication with a wireless device (i.e. UE).
  • a wireless base station i.e. eNB
  • UE wireless device
  • the eNB In order to transmit, e.g., scheduling information to the UE via a DCI within the ePDCCH, the eNB must allocate corresponding eCCEs within a search space of the ePDCCH configured for blind decoding by the UE.
  • the eNB knows the UE/cell identification (e.g. the relevant RNTI), as well as the subframe index in which the DCI is to be transmitted. It also knows the relevant configuration of the UE and the current state of the radio channel. It is therefore able to determine the corresponding search space within which the DCI should be allocated for correct blind decoding by the UE, e.g. to select the required search space structure from the exemplary structures 1000 , 1100 .
  • the relevant search space structures and/or parameters defining the search spaces may be stored in a database, table or other record store 1202 . Accordingly, at step 1204 , the eNB processor determines and selects the appropriate search space information from the record store 1202 . The eNB processor then constructs a composite control channel structure (e.g. the composite eCCEs 1010 , 1110 ) at step 1206 . In general, the eNB will need to transmit DCIs to a plurality of UEs, and thus the composite eCCEs will typically be populated with a plurality of DCIs directed to one or more UEs within associated search space structures. (For the purposes of the present discussion, we assume that contention/blocking does not occur.)
  • a composite control channel structure e.g. the composite eCCEs 1010 , 1110
  • the eNB processor maps the composite control channel structures (e.g. composite eCCEs) to the allocated resources (e.g. PRB pairs) within the data region of the subframe, resulting in a plurality of control channel structures (e.g. eCCEs) being associated with corresponding resource elements within the subframe.
  • composite control channel structures e.g. composite eCCEs
  • allocated resources e.g. PRB pairs
  • the subframe, including the ePDCCH including the eCCEs, is transmitted, and at step 1212 it is received by the UE.
  • the UE processor identifies the received control channel structures (e.g. eCCEs) within the subframe, and at step 1216 the UE processor reconstructs the composite control channel structures (e.g. composite eCCEs).
  • the UE processor determines and selects the appropriate search space information, replicating the process conducted by the eNB when constructing the original composite eCCEs, and then performs blind decoding of the DCI(s) by conducting a search of the selected search space. This will lead to identification of any DCI(s) directed to the UE, which can then be decoded and further relevant actions taken by the UE processor.
  • the number of configured ePDCCH resource sets/clusters could be cell-specific or UE-specific, and it may be dependent on system bandwidth and deployment scenarios.
  • one set for localized transmission and one set for distributed transmission are considered to outline the signaling mechanism.
  • this could be extended to any number of sets.
  • the signaling contents are advantageously designed to support dynamic PRB allocations to UE for ePDCCH.
  • the same signaling contents could be used to indicate PRB allocations semi-statically to UE by RRC signaling.

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