WO2010124721A1 - Signalisation d'allocation de ressources optimisée sur un canal de commande de liaison descendante physique - Google Patents

Signalisation d'allocation de ressources optimisée sur un canal de commande de liaison descendante physique Download PDF

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Publication number
WO2010124721A1
WO2010124721A1 PCT/EP2009/055087 EP2009055087W WO2010124721A1 WO 2010124721 A1 WO2010124721 A1 WO 2010124721A1 EP 2009055087 W EP2009055087 W EP 2009055087W WO 2010124721 A1 WO2010124721 A1 WO 2010124721A1
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Prior art keywords
downlink control
control information
information format
type
search space
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PCT/EP2009/055087
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English (en)
Inventor
Frank Frederiksen
Carsten Ball
Mieszko Chmiel
Wolfgang Payer
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Nokia Siemens Networks Oy
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Priority to PCT/EP2009/055087 priority Critical patent/WO2010124721A1/fr
Publication of WO2010124721A1 publication Critical patent/WO2010124721A1/fr

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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
    • H04L5/0091—Signaling for the administration of the divided path
    • 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
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0046—Code rate detection or code type detection
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0075—Transmission of coding parameters to receiver

Definitions

  • the present invention relates to an apparatus, method and computer program product for an optimized resource allocation signaling on a physical downlink control channel .
  • DRS - dedicated reference signal also referred to as URS (UE-specific reference signal)
  • eNB - evolved Node B also referred to as eNodeB
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • PMI precoding matrix indicator
  • Embodiments of the present invention relate to the Long Term Evolution (LTE) system currently specified in 3GPP, and, more specifically, to resource allocation, downlink (DL) control signalling and DL grant monitoring by the UE configured in open or closed loop spatial multiplexing or dual layer dedicated beamforming.
  • LTE Long Term Evolution
  • DL downlink
  • UEs configured in the transmission modes can be scheduled by the eNB downlink data on PDSCH by two types of downlink control signalling grants on PDCCH, namely DCI 2/2A and DCI IA.
  • TM closed/open-loop spatial multiplexing
  • CL SM closed-loop spatial multiplexing
  • TM-4 transmission mode 4
  • eNB downlink data on PDSCH by two types of downlink control signalling grants on PDCCH, namely DCI 2/2A and DCI IA.
  • the payload size including CRC (cyclic redundancy check) for bandwidth (BW) is listed for each DCI format.
  • supported PDSCH resource allocation types are listed, wherein there are three different types, namely types 0, 1 and 2.
  • Type 2 can be further distinguished (by means of a bit flag) between localized virtual resource block (VRB) (LVRB) assignment and distributed VRB (DVRB) assignment.
  • VRB virtual resource block
  • DVRB distributed VRB
  • PDSCH physical downlink shared channel
  • the merit of using DCI IA in closed/open-loop spatial multiplexing is the reduced PDCCH size compared to single codeword transmission with DCI 2/2A.
  • Message 2/2A has a factor 1.5 higher payload thus resulting in less coding gain for the same CCE aggregation level. This results in:
  • Fig. 2A and 2B provide block error rate (BLER) vs. SINR curves for different CCE Aggregation Levels ranging from AGG-I to AGG-8.
  • BLER block error rate
  • Fig. 2A shows 45 bit PDCCH BLER for EPA5 channel model assuming real channel estimation vs. SNIR
  • Fig. 2B shows 60 bit PDCCH BLER for EPA5 channel model vs. SNIR.
  • the resource allocation type 2, c.f. 36.213, supported with DCI format IA allocates only consecutive resource blocks either in the localized or distributed virtual block domain, while the resource allocation type 0 and 1 supported by DCI formats 2/2A allocate either resource block groups by a bitmap approach or allocate resource blocks (RBs) within a selected resource block group subset respectively.
  • a further issue, related to the current resource allocation setup with DCI 2/2A and IA in closed/open-loop spatial multiplexing relates to retransmissions: the channel quality indicator (CQI) reporting modes [c.f. 36.213] for closed/open-loop spatial multiplexing modes are tailored for transmission modes supported by corresponding DCI formats 2/2A.
  • CQI channel quality indicator
  • the resource allocation of this DCI does not fully match the available CQI information and reduces the gains of frequency domain packet scheduling.
  • the eNode B can switch between DCI formats 2/2A and IA during a retransmission of a transport block.
  • the problem that the CQI feedback and resource allocation mismatches for this transport block (TB) will be even more pronounced.
  • Another alternative for overcoming the drawbacks of the limited Rel-8 PDCCH signalling capabilities is semi- static adaptation of the transmission mode via dedicated RRC signalling.
  • UEs under poor radio conditions which are preferably supporting OL diversity or CL single codeword transmission, might be commanded transmission mode 2 for OL operation or transmission mode 6 for CL operation thus permanently using small DCI format Ix.
  • Drawback of such a solution is the slow transmission mode adaptation capability causing high signaling load on the air interface as well as high eNodeB internal processing load.
  • Furthermore such a solution is much slower than the decisions provided by a dynamic MIMO mode switching algorithm. Also synchronizatin issues during the higher layer switching must be carefully handeled.
  • a downlink control information format is monitored or created, wherein downlink control information format is a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • a downlink control information format is monitored or created, wherein the downlink control information format is a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • a downlink control information format may be monitored or created, wherein the downlink control information format is a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format.
  • a downlink control information format may be monitored or created, wherein the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format .
  • a dual code word downlink control information format may be monitored or created in a predetermined first search space, and a single stream downlink control information format may be monitored or created in a predetermined second search space.
  • Fig. 1 a structure of an eNodeB and a user equipment (UE) according to some embodiments of the present invention
  • Fig. 2A and 2B show SNIR gain for DCI format 1/lx over
  • Fig. 3 shows system simulation results for a MIMO dual code word utilization vs. Load
  • Fig. 4A and 4B show number of scheduled users per TTI versus PDCCH load for DCI format 1/lx and DCI format 2/2A at full load;
  • Fig. 5 shows average aggregation levels for DCI format 1/lx and 2/2A at full load.
  • Fig. 1 shows structures of the network elements as used in some of the embodiments described in the following.
  • Reference number 11 shows an eNodeB as an example for a network control element or an apparatus creating downlink control information.
  • the eNodeB 11 comprises a controller 111 which may perform the overall control of the eNodeB.
  • the controller comprises a DCI generator 112 configured to create downlink control information, and a DCI positioner 113 configured to position or place the created DCI on a search space, e.g., a UE-specific search space or a common search space on a PDCCH. It is noted that the functions of the DCI generator 112 and the DCI positioner can be also carried out by the controller 111.
  • Reference number 12 shows an user equipment (UE) as an example for an apparatus monitoring downlink control information or downlink control information formats.
  • the UE comprises a controller 121 which may perform the overall control of the UE.
  • a monitor unit 122 is provided which is configured to monitor downlink control information formats on a PDCCH, for example. It is noted that the controller 121 and the monitor unit 122 may be provided as one unit, e.g., such that the controller performs the control and performs monitoring.
  • the monitor unit 122 of the UE 12 is configured in dual code word transmission mode (also referred to as dual or double stream transmission mode) to monitor a downlink control information format on a downlink control channel, the downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the controller 111 of the eNodeB is configured to create downlink control information in a dual code word transmission mode on a downlink control channel in a downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel (e.g., PDSCH) .
  • DCI Format 1 (as an example for the single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel) to the current DCI formats monitored by the UE in closed-loop and open- loop spatial multiplexing transmission modes (and in the future mode of DRS/URS-based dual layer beamforming) .
  • DCI Format 1 as an example for the single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel
  • DCI format 1 has similar size as DCI format IA (47 bit instead of 43 bit for 10 MHz Bandwidth) but relies on the same allocation types as DCI formats 2/2A.
  • another DCI format IX is added to the 3GPP standard having less payload than 2/2A and providing the same resource allocation type, preferably of the same size as the current DCI format 0 or IA in order not to increase the number of UE blind decodings .
  • the monitor unit 122 of the UE 12 is configured to monitor a downlink control information format, the downlink control information format being a dual code word (also referred to as dual stream) downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel (PDSCH) .
  • the controller 111 of the eNodeB is configured to create downlink control information in a downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel (PDSCH) .
  • dual codeword DL grants are extended so that the resource allocation type(s) supported by these grants are compatible with the resource allocation of DCI IA (e.g. DCI 2X/2Y supporting resource allocation type 2 of LVRD and/or DVRB) .
  • DCI IA e.g. DCI 2X/2Y supporting resource allocation type 2 of LVRD and/or DVRB
  • Table 4 shows the sizes of the RB assignment fields for resource allocation type 0/1 and 2. As can be seen the sizes of RB assignment field for RA type 0/1 are always greater than the ones for RA type 2. Therefore, this embodiment can be implemented by inserting a RA Type 0/1 or 2 flag into the new dual code word DCI format (or some other indication e.g. base on CRC masking varying, redundancy version varying or scrambling varying) so that the flag/indication redefines the (or a subset of) RB assignment field to alternatively support RA type 2 (in addition to RA type 0/1)
  • the monitor unit 122 of the UE 12 is configured to monitor a downlink control information format, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel (PDSCH) .
  • the controller 111 of the eNodeB is configured to create downlink control information in a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel (PDSCH) .
  • the downlink control information format is adapted also to carry the payload of a single stream downlink control information format.
  • appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the existing formats 2/2A are modified towards a message 2Z to carry the smaller payload of a format IX (or format 1) in case of diversity or single codeword transmission and appropriate coding is added to achieve a format 1/lX equivalent link performance and to achieve the same number of bits as the payload of format 2/2A, prior to convolutional encoding. That is, in case of the third embodiment, a number of bits remain unused.
  • the dual stream format is adapted such that only the payload of a single stream downlink allocation is contained; this basically results then in a single stream allocation format (e.g., a format Iz) .
  • the "unused" bits are used to add additional coding/improve the coding of the used bits thereby improving decoding performance in the UE.
  • the monitor unit 122 of the UE 12 is configured to monitor a dual code word downlink control information format in a first search space, and to monitor a single stream downlink control information format in a predetermined second search space. Similar, the controller 111 of the eNodeB 11 is configured to position downlink control information in a dual code word downlink control information format in a first search space, and to position downlink control information in a single stream downlink control information in a predetermined second search space.
  • the fourth embodiment it is introduced the option of expanding (or appending) the PDCCH search space for the cases where more DCI formats for DL allocations are introduced.
  • the DCI CRC should be scrambled with a cell radio network temporary identifier (C-RNTI), or
  • the DCI CRC should be scrambled with the cell radio network temporary identifier (C-RNTI), or
  • a flag to distinguish the DCI format 2/2A from IX/ 1 can be added to the payload of both DCI formats or indicative CRC masking can be used.
  • the eNB could use the new format for DL transmission grants, if single stream OL Diversity or CL single codeword transmission has been decided, for example by the fast dynamic MIMO switch.
  • the existing formats 2/2A could be used.
  • the proposal will require a moderate increase of the UE PDCCH blind decoding trials from the current 44 to 76 blind decodes per subframe (the increase would be applicable to UEs in TM3, TM4, or in other dual code word beamforming mode) .
  • the current number of blind decoding attempts is not considered extensive and the required increase is seen as feasible in the Rel-9 timeframe .
  • a UE is configured to be monitoring DCI format 2/2A using the UE specific search space given by 3GPP 36.213, section 9.1.1.
  • the UE is given an additional search space to look for the PDCCH.
  • This additional search space could be defined as a subset of the normal PDCCH search space, but could also be defined as an expansion/extension of the traditional search space. On option for this would be to introduce a simple and linear extension of the search space.
  • the eNB is provided an option for fast switching between single and dual code word transmission.
  • the UE search space is expanded by a small fraction.
  • the proposed solution is backwards compatible, i.e. the existing algorithms in the eNB for PDCCH scheduling need only minor upgrade since the proposed solution fully contains the existing Rel-8 compatible one.
  • DCI format 2/2A is used to create the expanded search space. That is, this basically refers to a UE being configured in TM 2.
  • the same resource allocation types can be supported by the single codeword and dual codeword DL scheduling grants used in closed/open-loop spatial multiplexing modes (or in other modes like DRS-based dual layer beamforming) thus: o Efficient coexistence of resource allocations scheduled with dual codeword DL grants (DCI 2/2A) and with single codeword DL grants (DCI 1) is enabled allowing to avoid scheduler restrictions (due to mismatch between the DCI IA and 2/2A resource allocation types) . o A better match between the available CQI feedback and the resource allocation types is provided allowing higher gains of the frequency domain scheduling of the corresponding PDSCH. PDCCH coverage gains of in case a single TB is scheduled with DCI 1 not 2/2A as estimated in the following table 5.
  • PDCCH capacity gain the link level gains can be also translated into less PDCCH resources needed for single code word transmission and thus a higher overall PDCCH capacity.
  • DCI 1 can even outperform IA in 1.4 MHz and in configurations where UL BW is grater than the DL BW due to IA padding.
  • DCI format 2/2A is a pure waste of PDCCH capacity.
  • DCI format 1/lX a significantly higher number of users can be served with less blocking. The same would be valid for a modified DCI format 2/2X with equivalent format 1/lX link performance.
  • Fig. 3 shows simulation results for the MIMO dual code word utilization vs. Load, and in more detail OL and CL MIMO spatial multiplexing Utilization vs. System Load given in avg. #UEs per cell.
  • Figs. 4A and 4B shows the number of users possible for scheduling per transmission time interval (TTI) versus PDCCH load when limiting to -4% blocking, and in more detail the number of scheduled Users per TTI for the different DCI formats (Fig. 4A:DCI format 1/1X, Fig. 4B: DCI format 2) vs. PDCCH Loading (fully loaded 10 MHz System) .
  • the obtained capacity gain is significant and is in the order of up to 50% for the same PDCCH Load (practically, it can be expected up to 20-30%) .
  • the parameter "alpha" is indicated on the abscissa as an indicator of the PDCCH load, and is an eNodeB internal parameter.
  • Fig. 5 which illustrates Average Aggregation Levels for DCI format 1 and 2/2A at full Load shows, that the average Aggregation Levels for DCI format 2/2A are significantly higher than for format 1. Note that AGG-4 has only 2 search positions on PDCCH, whereas AGG-2 has 6 positions.
  • the names of the new DCI format are not limited to IX, 2X, 2Y, 2Z etc., but can be modified as necessary.
  • the format 2Z according to the third embodiment could be named as 2C, 2D or the like.
  • an apparatus which comprises a monitor unit configured in dual code word transmission mode to monitor a downlink control information format on a downlink control channel, the downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the downlink control information format may be a downlink control information format 1 or IX.
  • an apparatus which comprises a monitor unit configured to monitor a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the downlink control information may comprise a dual codeword downlink grant.
  • an apparatus which comprises a monitor unit configured to monitor a downlink control information format, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format.
  • an apparatus which comprises a monitor unit configured to monitor a downlink control information format, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the first to third aspects may be modified as follows:
  • the downlink control information format may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the monitor may be configured to monitor user equipment specific search spaces only.
  • the monitor may be configured to monitor user equipment specific search spaces and common search spaces.
  • an apparatus which comprises a monitor unit configured to monitor a dual code word downlink control information format in a predetermined first search space, and to monitor a single stream downlink control information format in a predetermined second search space.
  • the fourth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof .
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the apparatus according to the first to fourth aspects may be or may be part of a user equipment.
  • an apparatus which comprises a controller configured to create downlink control information in dual code word transmission mode on a downlink control channel using a downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the fifth aspect may be modified as follows:
  • the downlink control information format may be a downlink control information format 1 or IX.
  • the controller may be configured to use, for a single stream open loop diversity, the single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the controller may be configured to use, for a open-loop double codeword transmission or closed-loop double codeword transmission, a dual code word downlink control information format for a physical downlink shared channel .
  • an apparatus which comprises a controller configured to create downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the sixth aspect may be modified as follows:
  • the downlink control information may comprise a dual codeword downlink grant.
  • the controller may be configured to use, for open loop dual codeword transmission or closed loop dual codeword transmission or DRS-based dual layer/codeword transmission, the dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the controller may be configured to use, for a single stream open loop diversity, a single stream downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel .
  • an apparatus which comprises a controller configured to create downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format.
  • an apparatus which comprises a controller configured to create downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • a controller configured to create downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the fifth to seventh aspects may be modified as follows:
  • the downlink control information may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the controller may be configured to position the downlink control information in user equipment specific search spaces only.
  • the controller may be configured to position the downlink control information in user equipment specific search spaces and common search spaces.
  • an apparatus which comprises a controller configured to position downlink control information in a dual code word downlink control information format in a predetermined first search space, and to position downlink control information in a single stream downlink control information in a predetermined second search space.
  • the eighth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof.
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the apparatus according to the fifth to eighth aspects may be or may be part of a network control element.
  • the network control element may be an eNodeB.
  • an apparatus which comprises means for monitoring monitor a downlink control information format on a downlink control channel in dual code word transmission mode, the downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the downlink control information format may be a downlink control information format 1 or IX.
  • an apparatus which comprises means for monitoring a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel .
  • the downlink control information may comprise a dual codeword downlink grant.
  • an apparatus which comprises means for monitoring a downlink control information format, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format.
  • an apparatus which comprises means for monitoring a downlink control information format, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format .
  • the ninth to eleventh aspects may be modified as follows:
  • the downlink control information format may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the apparatus may comprise means monitoring a user equipment specific search spaces only.
  • the apparatus may comprise means for monitoring user equipment specific search spaces and common search spaces .
  • an apparatus which comprises means for monitoring a dual code word downlink control information format in a predetermined first search space, and for monitoring a single stream downlink control information format in a predetermined second search space.
  • the twelfth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof .
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the apparatus according to the ninth to twelfth aspects may be or may be part of a user equipment.
  • an apparatus which comprises means for creating downlink control information in dual code word transmission mode on a downlink control channel using a downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the thirtheenth aspect may be modified as follows:
  • the downlink control information format may be a downlink control information format 1 or IX.
  • the apparatus may comprise means for using, for a single stream open loop diversity, the single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the apparatus may comprise means for using, for a open- loop double codeword transmission or closed-loop double codeword transmission, a dual code word downlink control information format for a physical downlink shared channel .
  • an apparatus which comprises means for creating downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel .
  • the fourteenth aspect may be modified as follows:
  • the downlink control information may comprise a dual codeword downlink grant.
  • the apparatus may comprise means for using, for open loop dual codeword transmission or closed loop dual codeword transmission or DRS-based dual layer/codeword transmission, the dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the apparatus may comprise means for using, for a single stream open loop diversity, a single stream downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel .
  • an apparatus which comprises means for creating downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format.
  • an apparatus which comprises means for creating downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • a downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the thirteenth to fifteenth aspects may be modified as follows :
  • the downlink control information may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the apparatus may comprise means for positioning the downlink control information in user equipment specific search spaces only.
  • the apparatus may comprise means for positioning the downlink control information in user equipment specific search spaces and common search spaces.
  • an apparatus which comprises means for positioning downlink control information in a dual code word downlink control information format in a predetermined first search space, and means for positioning downlink control information in a single stream downlink control information in a predetermined second search space.
  • the sixteenth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof .
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the apparatus according to the thirteenth to sixteenth aspects may be or may be part of a network control element .
  • the network control element may be an eNodeB.
  • a method which comprises monitoring a downlink control information format in a dual code word transmission mode on a downlink control channel, the downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the downlink control information format may be a downlink control information format 1 or IX.
  • a method which comprises monitoring a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the downlink control information may comprise a dual codeword downlink grant.
  • a method which comprises monitoring a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and to carry the payload of a single stream downlink control information format .
  • a method which comprises monitoring a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the seventeenth to nineteenth aspects may be modified as follows :
  • the downlink control information format may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the monitoring may monitor user equipment specific search spaces only.
  • the monitoring may monitor user equipment specific search spaces and common search spaces.
  • a method which comprises monitoring a dual code word downlink control information format in a predetermined first search space, and monitoring a single stream downlink control information format in a predetermined second search space .
  • the twentieth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof .
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the method is carried out by an apparatus such as a user equipment or a part thereof.
  • a method which comprises creating downlink control information in a dual code word transmission mode on a downlink control channel using a downlink control information format being a single stream downlink control information format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the twenty-first aspect may be modified as follows:
  • the downlink control information format may be a downlink control information format 1.
  • the method may further comprise using, for a single stream open loop diversity, the single stream downlink control information format being adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel.
  • the method may further comprise using, for a dual code word open loop diversity or closed-loop double codeword transmission, a dual code word downlink control information format resource allocation type for a physical downlink shared channel.
  • a method which comprises creating downlink control information on a downlink control channel using a downlink control information format being a dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the twenty-second aspect may be modified as follows:
  • the downlink control information may comprise a dual codeword downlink grant.
  • the method may further comprise using, for open loop dual codeword transmission or closed loop dual codeword transmission or DRS-based dual layer/codeword transmission, the dual code word downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the method may further comprise using, for a single stream open loop diversity, a single stream downlink control information format adapted to support a type 2 resource allocation type for a physical downlink shared channel .
  • a method which comprises creating downlink control information in a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel, and to carry the payload of a single stream downlink control information format.
  • a method which comprises creating downlink control information in a downlink control information format on a downlink control channel, the downlink control information format being a dual code word downlink control information format adapted to support a single stream type 0 or type 1 resource allocation type for a physical downlink shared channel, and wherein appropriate coding is added to achieve the same number of bits as the payload of a dual stream downlink control information format.
  • the twenty-first to twenty-third aspects may be modified as follows:
  • the downlink control information may comprise a cyclic redundancy check scrambled with a cell radio network temporary identifier.
  • the method may further comprise positioning the downlink control information in user equipment specific search spaces only.
  • the method may further comprise positioning the downlink control information in user equipment specific search spaces and common search spaces.
  • a method which comprises positioning downlink control information in a dual code word downlink control information format in a predetermined first search space, and positioning downlink control information in a single stream downlink control information in a predetermined second search space.
  • the twenty-fourth aspect may be modified as follows:
  • the second search space may be an extension of the first search space or a subset of the first search space, or the first search space may be a subset of the second search space.
  • the first search space may be a user equipment specific search space or a common search space, or a combination thereof .
  • the first search space and the second search space may partly overlap each other.
  • the single stream downlink control information format may be a format adapted to support a type 0 or type 1 resource allocation type for a physical downlink shared channel .
  • the dual code word downlink control information format may be a format adapted to support a type 2 resource allocation type for a physical downlink shared channel.
  • the dual code word downlink control information format may be a format adapted to support a single stream type 1 or 0 resource allocation type for a physical downlink shared channel.
  • the method is carried out by an apparatus such as a network control element or a part thereof.
  • the network control element may be an eNodeB.
  • a computer program product which comprises code means for performing a method according any of the above seventeenth to twenty-fourth aspects or their modifications when run on a processing means or module.
  • - method steps likely to be implemented as software code portions and being run using a processor at a network element or terminal are software code independent and can be specified using any known or future developed programming language as long as the functionality defined by the method steps is preserved; - generally, any method step is suitable to be implemented as software or by hardware without changing the idea of the invention in terms of the functionality implemented; - method steps and/or devices, units or means likely to be implemented as hardware components at the above- defined apparatuses, or any module (s) thereof, (e.g., devices carrying out the functions of the apparatuses according to the embodiments as described above, UE, eNodeB etc.
  • MOS Metal Oxide Semiconductor
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS Bipolar CMOS
  • ECL emitter Coupled Logic
  • TTL Transistor- Transistor Logic
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP Digital Signal Processor
  • the above-defined apparatuses, or any one of their respective means can be implemented as individual devices, units or means, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device, unit or means is preserved;
  • an apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor;
  • - a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon plusieurs modes de réalisation de la présente invention, un format d'informations de commande de liaison descendante est surveillé ou créé, le format d'informations de commande de liaison descendante étant un format d'informations de commande de liaison descendante à un seul flux conçu pour supporter un type d'allocation de ressources 0 ou 1 pour un canal partagé de liaison descendante physique. Selon une variante, le format d'informations de commande de liaison descendante peut être un format d'informations de commande de liaison descendante à deux mots de code conçu pour supporter un type d'allocation de ressources 2 pour un canal partagé de liaison descendante physique. D'autres formats d'informations de commande de liaison descendante sont également proposés.
PCT/EP2009/055087 2009-04-27 2009-04-27 Signalisation d'allocation de ressources optimisée sur un canal de commande de liaison descendante physique WO2010124721A1 (fr)

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WO2013117014A1 (fr) * 2012-02-10 2013-08-15 Nokia Siemens Networks Oy Identification d'un sous-ensemble d'une pluralité de ressources radio d'un canal de commande de liaison descendante
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CN112996006A (zh) * 2014-11-07 2021-06-18 松下电器（美国）知识产权公司 控制通信设备的过程的集成电路
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WO2016119592A1 (fr) * 2015-01-30 2016-08-04 中兴通讯股份有限公司 Procédé et dispositif d'instruction d'attribution de ressources
WO2017000376A1 (fr) * 2015-06-30 2017-01-05 宇龙计算机通信科技(深圳)有限公司 Procédé d'indication et dispositif d'indication pour l'attribution de ressources, station de base, et terminal
WO2017171507A1 (fr) * 2016-03-31 2017-10-05 삼성전자 주식회사 Procédé d'attribution de ressources dans un système de communication sans fil, procédé de réception de données sur la base de celui-ci et dispositif associé
US11470607B2 (en) 2016-03-31 2022-10-11 Samsung Electronics Co., Ltd Resource allocation method in wireless communication system, data reception method on basis of same and device for same
WO2022240326A1 (fr) * 2021-05-12 2022-11-17 Telefonaktiebolaget Lm Ericsson (Publ) Espaces de recherche pour communication sans fil

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