WO2012062178A1 - 用于确定中继链路资源单元组的方法及装置 - Google Patents
用于确定中继链路资源单元组的方法及装置 Download PDFInfo
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- WO2012062178A1 WO2012062178A1 PCT/CN2011/081763 CN2011081763W WO2012062178A1 WO 2012062178 A1 WO2012062178 A1 WO 2012062178A1 CN 2011081763 W CN2011081763 W CN 2011081763W WO 2012062178 A1 WO2012062178 A1 WO 2012062178A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
-
- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- 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
- H04L5/0037—Inter-user or inter-terminal allocation
-
- 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
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for determining a relay link resource unit group.
- the relay technology can increase the coverage and balance and increase the cell throughput.
- the relay node has a relatively small configuration cost compared to the base station. Therefore, the relay is regarded as 3GPP.
- 3rd Generation Partnership Project 3rd Generation Partnership Project, 3GPP for short
- LTE Long Term Evolution
- Rel-8 or Rel-9 A key technology in the LTE-Advanced (LTE-A, commonly referred to as the Release 10 protocol version, referred to as Rel-10).
- the LTE/LTE-A system downlink is based on OFDM (Orthogonal Frequency Division Multiplexing) technology.
- OFDM Orthogonal Frequency Division Multiplexing
- communication resources are in the form of time-frequency two-dimensional.
- each radio frame has a length of 10 ms, including 10 frames.
- a sub-frame of length 1 ms.
- each subframe is further divided into two slots in the time direction.
- CP Cyclic Prefix, CP for short
- each subframe can contain 14 or 12 OFDM symbols.
- the subframe uses the normal CP (Normal CP) length, the subframe contains 14 OFDM symbols, each slot has 7 symbols; when the subframe uses the extended CP (Extended CP) length, the subframe contains 12 OFDM symbols, each slot has 6 symbols.
- the downlink communication resources are in the frequency direction, and the resources are in the subcarriers. (sub-carrier) is divided into units. Specifically, in communication, the smallest unit of resource allocation is RB (Resource Block), and one PRB (Physical RB) of the corresponding physical resource. As shown in FIG. 2, one PRB includes 12 subcarriers in the frequency domain and one slot in the time domain. Two RBs adjacent in the time domain within a subframe are referred to as RB pairs. A resource corresponding to one subcarrier on each OFDM symbol is called a Resource Element (RE).
- RE Resource Element
- the OFDM symbol number in the subframe is 0-1-3 in the normal CP length
- the OFDM symbol number in the slot is 0-6, and the OFDM symbol number in the subframe is 0-11 when the CP length is extended.
- the OFDM symbol number in the slot is 0-5.
- the original base station-terminal communication mode becomes a base station-relay station-terminal communication mode
- the base station-relay link is called a relay link (also referred to as a Un-interface).
- the relay-terminal link is called an access link (or Uu interface), and the base-to-terminal link is called a direct link.
- some terminals access the relay station and complete the communication service through the relay station.
- the base station-relay station communication and the relay station-terminal communication are determined in a time division manner in the LTE-A system. Specifically, a part of the downlink subframe is used for base station-relay communication, and these subframes are called relays. Subframe (or called Un subframe).
- the relay subframe For the Rel-8 terminal of the relay station, the relay subframe is indicated as an MBSFN (Multicast Broadcast Single Frequency Network, MBSFN) subframe, so that the Rel-8 terminal can skip These subframes ensure backward compatibility with the Rel-8 terminal while completing the base station-relay communication.
- MBSFN Multicast Broadcast Single Frequency Network
- the relay node transmits control information to the subordinate terminal in the first or second OFDM symbols of the relay subframe, and then passes the transition time interval from the transmission state to the reception state.
- PDCCH Physical Downlink Control Channel
- R-PDCCH relay link physical downlink control channel
- the technical problem to be solved by the present invention is to provide a method and apparatus for determining a relay link resource unit group, which is used to solve the problem that there is no backward compatible relay link resource unit group, and the relay chain cannot be implemented.
- the problem of downlink control information transmission is to provide a method and apparatus for determining a relay link resource unit group, which is used to solve the problem that there is no backward compatible relay link resource unit group, and the relay chain cannot be implemented.
- the present invention provides a method for determining a relay link resource unit group, including:
- CSI-RS non-zero power channel measurement reference signal
- CRS common reference signal
- DMRS Demodulation reference signal
- the allocated resources are used for transmission of a physical downlink control channel of a relay link, and include one or more consecutive or discretely distributed resource blocks in the frequency domain, and one or more orthogonal frequency division multiplexing (OFDM) in the time domain. )symbol.
- OFDM orthogonal frequency division multiplexing
- determining the size of the resource unit group according to the non-zero-power CSI-RS pattern and/or the zero-power CSI-RS pattern in the allocated resource determining, according to the 8-port CSI-RS pattern. The size of the resource unit group.
- determining the size of the resource unit group according to the CSI-RS pattern of the 8-port means that the resource units in the 8-port CSI-RS pattern are not used for data mapping of the resource unit group.
- a size of the resource element group located in the OFDM symbol is determined to be 6 consecutive resource units; the resource unit in an OFDM symbol The size of the group is determined to be 4 consecutive resource units.
- the resource unit group in the allocated resource is located in one OFDM symbol, when there is a non-zero power CSI-RS and/ in the OFDM symbol. Or zero power CSI-RS, and:
- the size of the resource unit group in the OFDM symbol Determined is 6 consecutive resource units, wherein the 6 consecutive resource units include 4 available resource units;
- the size of the resource unit group in the OFDM symbol Determining to be 12 consecutive resource units, wherein the 12 consecutive resource units include 4 available resource units;
- the OFDM symbol is determined to have no resource unit group mapping
- the foregoing method further includes:
- the number of resource unit groups in the relay link is determined according to the size of the resource unit group and the allocated resources.
- the foregoing method further includes:
- the resource unit groups are mapped to the allocated resources in the order of the first time direction and the subsequent frequency direction.
- the present invention also provides a mapping method for a relay link resource unit group, including: using a resource unit group as a mapping unit, and performing physical downlink control of the relay link according to an order of a time direction and a frequency direction
- the channel resources include one or more consecutive or discretely distributed resource blocks in the frequency direction, and orthogonal frequency division multiplexing (OFDM) symbols are available for the relay links included in one time slot in the time direction.
- OFDM orthogonal frequency division multiplexing
- the present invention also provides an apparatus for determining a relay link resource unit group, including: a transmission channel measurement reference signal acquisition module, configured to: acquire orthogonal frequency division multiplexing (OFDM) where the resource unit group is located a non-zero power channel measurement reference signal (CSI-RS) pattern in the symbol;
- OFDM orthogonal frequency division multiplexing
- CSI-RS non-zero power channel measurement reference signal
- a channel measurement reference signal silence configuration acquisition module configured to: obtain configuration information of a zero-power CSI-RS in an OFDM symbol in which the resource unit group is located, and determine a zero-power CSI-RS pattern based on the configuration information;
- a common reference signal acquiring module configured to: acquire a pattern of a common reference signal (CRS) transmitted in an OFDM symbol in which the resource unit group is located;
- CRS common reference signal
- a demodulation reference signal acquisition module configured to: acquire a pattern of a demodulation reference signal (DMRS) transmitted in a resource block in which the resource unit group is located;
- DMRS demodulation reference signal
- a resource unit group size determining module configured to: a non-zero power CSI-RS pattern, and/or a zero-power CSI-RS pattern, and/or a CRS pattern, and/or a resource unit according to an OFDM symbol in which the resource unit group is located
- the pattern of the DMRS transmitted in the resource block in which the group is located determines the size of the resource unit group.
- the resource unit group size determining module is configured to: when determining a size of the resource unit group according to a CSI-RS pattern in an OFDM symbol in which the resource unit group is located, determining the resource according to an 8-port CSI-RS pattern The size of the unit group;
- the CSI-RS pattern is a non-zero power CSI-RS pattern in the OFDM symbol in which the resource unit group is located and/or a zero-power CSI-RS pattern in the OFDM symbol in which the resource unit group is located.
- the resource unit group size determining module is configured to: determine the 8-port CSI-RS.
- the resource unit group size determining module is configured to:
- the size of the resource element group located in the OFDM symbol is determined as 6 consecutive resource lists t;
- the size of the resource unit group is determined to be 4 consecutive resource units.
- the resource unit group size determining module is configured to:
- the resource unit group in the OFDM symbol is The size is determined to be 6 consecutive resource units, and the 6 consecutive resource units include 4 available resource units;
- the resource unit group in the OFDM symbol is The size is determined to be 12 consecutive resource units, and the 12 consecutive resource units include 4 available resource units;
- the OFDM symbol is determined to have no resource unit group mapping.
- the mapping method of the tuple solves the problem of determining and mapping the relay link resource unit group.
- the control information can be directly carried according to the REG.
- the REG design described in the present invention fully considers the design of the REG in the presence of CRS, CSI-RS and DMRS on the relay link, and has less modification to the existing protocol, has better backward compatibility, and can solve the relay link.
- FIG. 1 is a schematic diagram of a frame structure of an LTE/LTE-A system
- FIG. 2 is a schematic diagram of a resource block structure of an LTE/LTE-A system
- FIG. 3 is a schematic diagram of a downlink relay subframe (Un subframe) of an LTE-A system
- Figure 4 is an 8-port CSI-RS pattern for the normal CP length of the LTE-A system
- Figure 5 is a 4-port CSI-RS pattern for the normal CP length of the LTE-A system
- FIG. 6 is an 8-port and 4-port CSI-RS pattern when the LTE-A system expands the CP length;
- FIG. 7 is a DMRS pattern of the normal CP and the extended CP in the LTE/LTE-A system;
- FIG. 8 is a schematic diagram of a REG design according to Embodiment 1 of the present invention.
- Figure 20 is a diagram showing the REG mapping of Embodiment 5 of the present invention. Preferred embodiment of the invention
- one PDCCH is transmitted in one or several consecutive CCEs (Control Channel Element, CCE for short), and the CCEs in one subframe are interleaved for resource mapping.
- the CCE interleaved unit is a REG (Resource Element Group, REG for short), and the transmission of a common reference signal (Cell-specific Reference Signal, or a common reference signal, or CRS for short), REG
- REG Resource Element Group
- CRS Common Reference Signal
- the size is 4 or 6 consecutive REs, and each REG contains 4 valid REs.
- the transmission resource of the R-PDCCH is located in the service domain of the Rel-8 system. Therefore, the channel state information reference signal (channel state information reference signal, or channel measurement reference signal, which is newly discussed in Rel-10) CSI-RS for short) may be located
- the R-PDCCH domain even the Demodulation Reference Signal (DMRS, also referred to as UE-specific RS, UE-specific reference signal) may also be located in the R-PDCCH domain.
- DMRS Demodulation Reference Signal
- UE-specific RS UE-specific reference signal
- the design of the relay link resource element group is different from the REG design of the PDCCH in the Rel-8 version.
- the REG of the relay link has its special place, for example, the transmission of CSI-RS, DMRS transmission, and the like.
- the REG design method of the present invention has little change to the existing protocol.
- the control information can be directly carried according to the determined REG.
- CSI-RS channel measurement reference signal
- the currently determined subframe has a normal cyclic prefix (normal CP) and the pattern of the 4-port CSI-RS in one RB pair is shown in Figure 4 and Figure 5, respectively.
- normal CP normal cyclic prefix
- Figure 4 and Figure 5 represent a CSI-RS pattern, namely:
- a total of 16 CSI-RS patterns (numbers 1 ⁇ 16) are supported at 4 ports, as shown in Figure 5; 8 CSI-RS patterns (numbers 1 ⁇ 8) are supported in 8 ports, as shown in Figure 4.
- the CSI-RS patterns shown on the left side of the dotted line interval are FDD (Frequency Division Dual, FDD for short) and TDD (Time Division Dual, TDD for short) systems.
- the pattern that should be supported, the right part of the dotted line is the pattern that the TDD system must support, and is optional for FDD.
- the CSI-RS pattern at the length of the extended cyclic prefix is shown in Figure 6.
- the left part of the dotted line is the CSI-RS pattern of the 8 antenna port, and the right part is the CSI-RS pattern of the 4 antenna port.
- the patterns on the 7 and 8 OFDM symbols (that is, CSI-RS pattern 5 ⁇ 7 at 8 ports and CSI-RS patterns 9 ⁇ 14 at 4 ports) are optional for FDD and mandatory for TDD, and the rest of the patterns are Both FDD and TDD are mandatory.
- the subframe position transmitted by the CSI-RS is configurable, and the CSI-RS is transmitted in full bandwidth within the transmission subframe.
- the neighboring cells are generally configured to use different CSI-RS patterns for CSI-RS transmission. Taking the normal CP length shown in FIG. 4 as an example, it is assumed that cell 1 and cell 2 are adjacent and CSI-RS is 8-port transmission, and cell 1 is configured. Using the CSI-RS pattern 1 of the left portion of the dotted line interval in FIG. 4, the cell 2 is configured to use the CSI-RS pattern 2 of the left portion, such that the two cells do not interfere with each other by the CSI-RS.
- muting means that the cell 1 is configured to not transmit any information at some REs, and these REs may be the location where the cell 2 transmits the CSI-RS.
- the specific muting RE is generally represented by a CSI-RS pattern, also referred to as a zero power CSI-RS, and the corresponding transmitted CSI-RS is referred to as a non-zero CSI-RS.
- cell 1 is configured to be muting at the RE corresponding to CSI-RS pattern 2 of Fig. 5.
- muting at RE corresponding to multiple CSI-RS patterns can be configured at the same time. Whether the control information of the link also participates in muting.
- the CSI-RS patterns shown in Figure 4-6 are CSI-RS patterns for 8-port and 4-port transmissions.
- CSI-RS will support the configuration of 1, 2, 4, and 8 antenna ports.
- a nested pattern is used, that is, if the CSI-RS is configured for 2-port transmission, the 2-port CSI-RS is in the resource corresponding to the two ports of the 4-port pattern.
- the CSI-RS pattern for one port is the same as the 2-port CSI-RS pattern. REs that do not transmit CSI-RS in CSI-RS patterns are used for data transmission.
- DMRS Demodulation Reference Signal
- the currently determined DMRS pattern when the sub-frame uses the normal CP length is shown in the left part of the dotted line in Figure 7.
- the DMRS pattern represented by the padding or padding in the figure is used; when the number of transmission layers is greater than 2, the two patterns are used at the same time. That is, when the number of transmission layers is less than or equal to 2, the overhead of DMRS is 12 REs in each RB pair, and when it is greater than 2, there are 24 REs in each RB pair.
- the DMRS under the extended CP only supports the maximum two layers of transmission, as shown in the right part of the dotted line in Figure 7.
- DMRS is generally only transmitted in RBs with traffic scheduling.
- the relay station does not receive the last OFDM symbol of the downlink relay subframe, the DMRS of the relay link is not mapped in the second time slot.
- R-PDCCH For the relay link physical downlink control channel (R-PDCCH), its transmission frequency domain location is It will only be part of the system bandwidth. And downlink authorization information for scheduling downlink service transmission
- the relay link resource unit group can be designed to be limited to one OFDM symbol, and the same REG does not cross the RB in the frequency domain, ensuring relay link control information mapping and receiving end processing. simple.
- the relay link REG of the present embodiment is designed to ensure that one REG can map four RE data to ensure compatibility with the Rel-8 system.
- CSI-RS non-zero power channel measurement reference signal
- CRS common reference signal
- DMRS resource unit group Demodulation reference signal
- the allocated resources are used for transmission of a physical downlink control channel of a relay link, and include a plurality of consecutive or discretely distributed resource blocks in the frequency domain, and a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
- OFDM orthogonal frequency division multiplexing
- Determining the size of the resource unit group according to a non-zero power CSI-RS pattern and/or a zero power CSI-RS pattern in the allocated resource determining the resource unit group according to an 8-port CSI-RS pattern the size of.
- a size of the resource element group located in the OFDM symbol is determined to be 6 consecutive resource units; when the allocated resource is OFDM When there is no reference signal transmission in the symbol, the size of the resource element group located in the OFDM symbol is determined to be 4 consecutive resource units.
- CRS common reference signal
- the size of the resource unit group is determined according to the actually transmitted DMRS pattern, or is determined according to the DMRS pattern of the single user layer 4 transmission;
- the size of the resource unit group in the OFDM symbol with DMRS transmission in the resource block is determined according to the actually transmitted DMRS pattern.
- the resource unit group in the allocated resource is located in one OFDM symbol, when the OFDM symbol is in the OFDM symbol.
- the 8-port CSI-RS pattern corresponding to the non-zero CSI-RS pattern and/or the zero-power CSI-RS is one
- the size of the resource unit group in the OFDM symbol is determined to be six consecutive resource units. , the six consecutive resource units include four available resource units;
- the size of the resource unit group in the OFDM symbol is determined.
- the 12 consecutive resource units include 4 available resource units;
- the OFDM symbol is determined to have no resource unit group mapping.
- DMRS Demodulation reference signal
- Determining the resource unit group size in the OFDM symbol transmitted by the demodulation reference signal according to one of the following four ways: CSI-RS maximum port number and DMRS maximum port number; or CSI-RS actual port number and DMRS actual port Number; or CSI-RS maximum port number and DMRS actual port number; or CSI-RS actual port number and DMRS maximum port number;
- the method further includes: following the order of the time direction and the frequency direction The resource unit group is mapped to the allocated resource.
- the present invention further provides a mapping method of the relay link resource unit group REG based on the determined resource unit group, including:
- the resource unit group is used as a mapping unit, and the relay link physical downlink control channel resource includes one or more consecutive or discretely distributed resource blocks in the frequency direction according to the order of the first time direction and the backward frequency direction.
- the direction includes Orthogonal Frequency Division Multiplexing (OFDM) symbols for the relay link within one time slot.
- OFDM Orthogonal Frequency Division Multiplexing
- an apparatus for determining a relay link resource unit group of the present invention includes:
- a transmission channel measurement reference signal acquisition module configured to: acquire a non-zero power channel measurement reference signal (CSI-RS) pattern in an orthogonal frequency division multiplexing (OFDM) symbol where the resource unit group is located; and perform channel measurement reference signal silence configuration
- an acquiring module configured to: obtain silence configuration information of a channel measurement reference signal (CSI-RS) in an orthogonal frequency division multiplexing (OFDM) symbol where the resource unit group is located, and determine zero power channel measurement based on the configuration information.
- Reference signal pattern configured to: acquire a non-zero power channel measurement reference signal (CSI-RS) pattern in an orthogonal frequency division multiplexing (OFDM) symbol where the resource unit group is located; and perform channel measurement reference signal silence configuration
- an acquiring module configured to: obtain silence configuration information of a channel measurement reference signal (CSI-RS) in an orthogonal frequency division multiplexing (OFDM) symbol where the resource unit group is located, and determine zero power channel measurement based on the configuration information.
- Reference signal pattern configured to: obtain silence
- a common reference signal acquiring module configured to: acquire a pattern of a common reference signal (CRS) transmitted in an orthogonal frequency division multiplexing (OFDM) symbol in which the resource unit group is located;
- CRS common reference signal
- OFDM orthogonal frequency division multiplexing
- a demodulation reference signal acquiring module configured to: acquire a pattern of a demodulation reference signal (DMRS) transmitted in the resource block where the resource unit group is located;
- DMRS demodulation reference signal
- a resource unit group size determining module configured to: measure a reference signal according to a non-zero power channel measurement reference signal (CSI-RS) pattern, and/or a zero power channel according to an orthogonal frequency division multiplexing (OFDM) symbol in which the resource unit group is located
- CSI-RS non-zero power channel measurement reference signal
- OFDM orthogonal frequency division multiplexing
- the resource unit group size determining module determines the size of the resource unit group according to a channel measurement reference signal (CSI-RS) pattern in an Orthogonal Frequency Division Multiplexing (OFDM) symbol in which the resource unit group is located, Determining the size of the resource unit group according to an 8-port channel measurement reference signal (CSI-RS) pattern;
- the channel measurement reference signal (CSI-RS) pattern is a non-zero power CSI-RS pattern in the OFDM symbol in which the resource unit group is located and/or a zero-power CSI-RS pattern in the OFDM symbol in which the resource unit group is located.
- the resource unit group size determining module determines the resource unit according to the actually transmitted DMRS pattern when the subframe in which the resource unit group is located has a normal cyclic prefix length and only the demodulation reference signal (DMRS) is transmitted in the OFDM symbol in which the resource unit group is located.
- the size of the resource unit group is determined according to the actually transmitted DMRS pattern.
- the resource unit group is located in one OFDM symbol, and the OFDM symbol corresponding to the resource block in which the resource unit group is located has a demodulation reference signal (DMRS) transmission, and the OFDM symbol has a CSI-RS transmission and/or Or silently CSI-RS of other cells;
- DMRS demodulation reference signal
- the resource unit group size determining module determines the resource unit group size according to one of the following four ways: CSI-RS maximum port number and DMRS maximum port number; or CSI-RS actual port number and DMRS actual port number; or CSI-RS The maximum number of ports and the actual number of DMRS ports; or the actual number of CSI-RS ports and the maximum number of DMRS ports;
- the resource unit group size determining module determines that there is no resource unit group in the OFDM symbol.
- resource base group a resource corresponding to one OFDM symbol in one resource block (RB) is referred to as a "resource base group", that is, one resource base group includes one RB in the frequency domain. 12 subcarriers, including 1 OFDM symbol in the time domain.
- the REG design can follow the rules of Rel-8, ie When there is no reference signal RS, the REG size is 4, as shown in the left part of the dotted line interval in Figure 8, that is, the REG size is 4 REs; when there is only CRS in the resource base group, the REG size is 6, as shown in the figure. 8 is shown in the right part of the dotted line interval, and when the CRS has only one port, it is processed according to the case of the 2-port CRS, that is, the control channel data is not mapped at the CRS port 1 (port number 0, 1).
- the CSI-RS mentioned here may be a CSI-RS transmitted by the local cell, or a CSI-RS in which the cell is configured to be muting.
- the way in which the CSI-RS maximum port is always assumed can be used.
- the CSI-RS maximum port means that if it is a CSI-RS (ie, non-zero-power CSI-RS) sent by the local cell, although the actual configuration of the transmitted CSI-RS may be 1, 2 or 4 ports, it is always According to the 8-port CSI-RS pattern, the REG design is adopted, that is, the RE of the 8-port CSI-RS is considered when designing the REG;
- the REG design is always performed according to the 8-port CSI-RS pattern. For example, for the five 8-port CSI-RS patterns shown in the left part of FIG. 4, if an RE is used as a CSI-RS transmission in a certain CSI-RS pattern or configured to muting at the RE, Then, when the REG is designed, the RE occupied by the CSI-RS pattern is rejected, that is, it is not used for mapping of REG data.
- the CSI-RS transmitted by the local cell is 8 ports, and there is no muting, and the corresponding 8-port CSI-RS pattern is 1; or the CSI-RS transmitted by the cell is 4 ports, for example, 5 CSI-RS pattern 2, and there is no muting of CSI-RS in the OFDM symbol where the pattern 2 is located, then the transmitted CSI-RS pattern corresponds to one 8-port CSI-RS pattern, that is, the CSI-RS pattern 2 of FIG. Or the CSI-RS transmitted by the cell is 4 ports, such as the CSI-RS chart of Figure 5.
- muting is configured in the RE corresponding to the CSI-RS pattern 6 in the cell, that is, although there are both CSI-RS transmission and CSI-RS muting configuration, the transmitted CSI-RS and the muting RE correspond to 8
- There is only one port CSI-RS pattern that is, CSI-RS pattern 1 of FIG.
- Other situations are analogous.
- the same is true when extending the length of the CP.
- the three resource base groups in the left part of the dotted line represent the REG determined when the normal CP length, and the three resource base groups in the right part of the dotted line represent the REG determined when the CP length is extended.
- the country padding area in Fig. 9 represents a pattern of CSI-RSs in a resource base group, and the ellipse indicates that those REs circled in the ellipse correspond to one REG.
- the REG size can be designed to be 12, that is, a resource base group is a REG, as shown in FIG. Among them, the three resource base groups in the left part represent the case of the normal CP, and the three resource base groups in the right part represent the case when the CP is extended.
- the same pattern fill in the figure belongs to the same 8-port CSI-RS pattern (country and ).
- the so-called corresponding 8-port CSI-RS pattern has a total of two meanings, which can be analogized according to the description of the corresponding 8-port CSI-RS pattern in the previous paragraph, and will not be described here.
- the REG may not be mapped in the resource base group.
- the LTE downlink mainly refers to the Space-Frequency Blocking Code, SFBC for short
- the decoding algorithm may need to respond to the channel response of adjacent modulation symbols.
- the available resources of the REG under the extended CP are larger in the frequency direction (the three resource base groups on the right in Figure 10 are separated by 2 REs), that is, the channel responses of adjacent modulation symbols may be different, and the average may be Will affect data demodulation performance.
- This embodiment considers the case where DMRS exists in the resource base group. Since control and services may be multiplexed in the same physical resource block pair (PRB pair), DMRS may be used in the resource base group for demodulation of service data.
- PRB pair physical resource block pair
- the REG design in the resource base group should consider the RE occupied by the DMRS to avoid conflicting between the two. In the actual REG design, there are two ways, as described in 3.1 and 3.2.
- the DMRS is used for demodulation of service data, and the number of transmission ports (or called the number of layers) is consistent with the actual number of data transmission layers. It is always assumed that the maximum port of the DMRS means that although the actual number of DMRS ports transmitted may not be greater than 2, the design of the REG is always assumed on the assumption that the number of DMRS ports is greater than 2. For example, if the subframe has a normal CP length, assuming that the DMRS is a 2-port transmission, the DMRS pattern indicated by the left part of the padding in FIG. 7 is used, that is, the overhead of the DMRS in the resource base group containing the DMRS is 3 REs. However, when designing the REG, it is assumed that the DMRS pattern represented by Changhe Fill is used, that is, the overhead of the DMRS in the resource base group containing the DMRS is 6 REs.
- the remaining REs of the resource base group with DMRS transmission except for the DMRS are insufficient to carry the control data of 2 REGs, so the REG size is designed to be 12, that is, the entire resource base group is A REG.
- the REG size is designed to be 12
- the entire resource base group is A REG.
- the padding represents the DMRS pattern in a resource base group. It should be understood that the location of the two remaining RE countries described herein is merely illustrative.
- the current DMRS of Rel-10 supports only 2-port transmission at the maximum, that is, there is no case where the DMRS overhead is different when the number of transmission layers is different.
- the REG size is designed to be 6 consecutive RE sizes, as shown in the right part of the dotted line interval in Figure 12.
- a sub-frame When a sub-frame has a normal CP length, it can also be processed according to the actual number of DMRS ports.
- the DMRS in the resource base group mapped with DMRS occupies 3 REs, that is, there are still 9 REs available for REG data mapping.
- the REG in the REG base group can be used. Designed as 6 consecutive RE sizes, as shown in Figure 13. In this case, there will be 1 RE not occupied by data transmission, as shown in the national padding of Figure 13. It should be understood that the location of the spare RE countries described herein is merely illustrative.
- the DMRS in the resource base group mapped with the DMRS occupies 6 REs.
- the REG can be designed according to the description in section 3.1 of this embodiment, as shown in the left part of FIG.
- the REG is determined according to the actual number of DMRS ports, which can improve resource utilization when the subframe has a normal CP length, and avoid resource waste.
- This embodiment considers the case where both the CSI-RS and the DMRS exist in the resource base group. Since control and services may be multiplexed in the same physical resource block pair (PRB pair), DMRS may be used in the resource base group for demodulation of service data. At the same time, the subframe may also have CSI-RS transmission, and the CSI-RS transmission described herein also includes the muting configuration.
- the REG design in the resource base group should consider the RE occupied by the CSI-RS and the DMRS to avoid conflict between the reference signal and the REG data. There are two ways to actually determine the REG size, as described in sections 4.1 and 4.2.
- the CSI-RS maximum port means that, as described in Embodiment 2, if it is a CSI-RS transmitted by the own cell, although the CSI-RS configured for transmission may be 1, 2 or 4 ports, it is always in accordance with 8
- the CSI-RS pattern of the port is determined by the REG; if the cell is configured with muting, although the muting may be configured according to the 4-port CSI-RS pattern, the REG is always determined according to the 8-port CSI-RS pattern. That is, consider the 8-port CSI-RS when determining the REG size. The occupied RE.
- the current DMRS of the Rel-10 supports only 2-port transmission. That is, there is no DMRS overhead when the number of transmission layers is different.
- the overhead of the DMRS in a resource base group is 4 REs.
- the REs can be used by the REG, so the REG size can be designed to be 12, that is, a resource base group is a REG, as shown in FIG.
- the Chang fill indicates the DMRS pattern, and the fill indicates the CSI-RS pattern.
- the REG may not be mapped in the resource base group as described in Embodiment 2.
- the total number of 8-port CSI-RS patterns corresponding to the CSI-RS and the muting RE transmitted in the OFDM symbol of the resource base group is two, no RE is available on the assumption that the CSI-RS port is the largest and the DMRS port is the largest. REG data transmission, so there is no REG mapping in such a resource base group.
- the number of REs occupied by the DMRS according to the number of ports is different: when the number of DMRS transmission ports is less than or equal to 2
- the DMRS overhead in the resource base group containing the DMRS is 3 REs.
- the DMRS overhead in the resource base group containing the DMRS is 6 REs.
- the remaining five REs except the RS are mapped to the resource base group with both CSI-RS and DMRS mapped, and one REG can be mapped.
- Data that is, the REG size is determined to be 12 REs, as shown in FIG. Zhongchang fill indicates DMRS pattern, padding indicates CSI-RS pattern, kl fill indicates that the RE does not map data); when DMRS transmission port number is greater than 2, resource base group with CSI-RS and DMRS mapped at the same time removes RS The remaining 3 REs, that is, the remaining REs are not enough to map the data of one REG. In this case, the REG is not mapped in the resource base group.
- the REG size can also be determined based on the number of real ports transmitted by the CSI-RS.
- the number of real ports for CSI-RS transmission mentioned here also includes the number of ports of the CSI-RS pattern corresponding to the muting RE when muting is configured.
- the DMRS when the subframe has a normal CP length, when the DMRS is included in the resource base group, it is assumed that the number of ports transmitted by the DMRS is greater than 2, that is, the DMRS occupies 6 REs in the resource base group.
- the specific principles can be summarized as follows: The size of the REG in the resource base group should ensure that each REG carries 4 valid REs. And the number of REs wasted as little as possible.
- the CSI-RS in the resource base group occupies 1 or 2 REs, plus the cost of 6 REs of the DMRS, and 5 or 4 remain in the resource base group.
- the REs are available.
- the size of the REG can be designed to be 12, as shown in Figure 16.
- the CSI-RS is the resource occupancy of the 2-port or 4-port transmission respectively:
- the solid-filled pattern indicates the DMRS pattern, and the padding indicates the CSI-RS.
- the pattern, the country fill shows that the RE does not map data).
- the REG is not mapped in the resource base group.
- the current DMRS of the Rel-10 supports only the 2-port transmission. That is, there is no DMRS overhead when the number of transmission layers is different.
- the overhead of the DMRS in a resource base group is 4 REs.
- the principle of determining the REG size can be summarized as follows: The size of the REG should ensure that each REG carries 4 valid REs, and the number of wasted REs is as small as possible.
- the OFDM symbol in which the REG is located is within the resources of one RB, the CSI-RS occupied by the RE is N1, the muting RE is N2, and the DMRS overhead is N3, then 4 ⁇
- N1+N2+N3 8 the REG size is 12.
- a 4-port CSI-RS transmission is configured in a certain resource base group, and muting is configured in the OFDM symbol in which the CSI-RS is located, and the muting RE corresponds to
- the CSI-RS pattern is also a 4-port.
- the ⁇ pad indicates the RE where the 4-port CSI-RS transmitted by the cell is located
- the country pad indicates the RE of the current cell muting, that is, the cell does not send any information in the country.
- Chang fill indicates that the DMRS occupies the RE.
- the REs occupied by the CSI-RS occupied by the local cell and the CSI-RS occupied by other cells in the muting, and the DMRS occupying the RE are removed, and the remaining 4 REs are available in the resource basic group shown in FIG. 17, and the REG size can be designed according to the method of the present invention. It is 12, that is, there is one REG in the resource base group, as shown by the ellipse in FIG.
- the REG design is performed according to the actual number of REs occupied by the DMRS and the CSI-RS.
- the REG design principles can be summarized as follows:
- the size of the REG should be such that each REG can carry 4 valid REs and the number of wasted REs is as small as possible.
- the transmitted CSI-RS occupies an N1
- the muting RE is N2
- the DMRS cost is N3, then when 0 ⁇ N1+N2+N3 ⁇ 4
- the REG size 6 when 4 ⁇ N1+N2+N3 8
- the REG size is 12, and when Nl+N2+N3>8, there is no REG mapping in the resource base group.
- the CSI-RS and the DMRS exist in the resource base group, and the CSI-RS is 4-port, and the DMRS is also 4-port, as shown in FIG. 18, thus in a resource base group.
- the remaining 4 REs are available, and the size of the REG in the resource base group can be designed to be 12 RE sizes.
- Chang indicates that the DMRS occupies RE, indicating that the CSI-RS occupies RE.
- the CSI-RS mentioned here may be a CSI-RS transmitted by the local cell, or a RE of the muting configured by the cell.
- the CSI-RS and the DMRS are simultaneously present in the resource base group, including the transmitted CSI-RS and the muting CSI-RS, and the two CSI-RSs are all 4-port, and the DMRS is For the 2-port, as shown in FIG. 19, the remaining 4 REs except the RE of the CSI-RS, the DMRS, and the muting are available in a resource base group, and the size of the REG in the resource base group can be designed to be 12 RE sizes.
- the figure shows that DMRS occupies RE, indicating that this small The area CSI-RS occupies the RE, and the country pad indicates the RE of the current cell muting, that is, the cell does not send any information in the surrounding area.
- This embodiment provides a mapping method of REG.
- Four modulation symbols can be mapped in the REG of this embodiment, and the four modulation symbols form a quad.
- the size of the REG may be 4, 6 or 12 RE sizes, but only one quad can be mapped.
- the mapping mode in this embodiment is that the resource unit group REG includes resources allocated by the physical downlink control channel of the relay physical downlink control channel, and includes a plurality of consecutive or discretely distributed resource blocks in the frequency direction, including in the time direction. An OFDM symbol within a slot that is available for use by the relay link.
- it may be the 3rd to 6th OFDM symbols in the 1st slot of the subframe, and may be the 0th to 6th or 0th to 5th OFDM symbols in the 2nd slot of the subframe. , where the OFDM symbol is numbered 0 to 6 in each slot.
- the resources allocated by the relay physical downlink control channel may be more than one in each time slot, that is, the resources for mapping the physical downlink control channel in each time slot are divided into N groups, respectively, in each group. Perform REG mapping, N > 1. Unless otherwise stated, the resources of the relay physical downlink control channel refer to such a group.
- the left part of the dotted line in Figure 20 shows a schematic representation of the RS distribution within an RB. Indicates the RE occupied by the CSI-RS transmission and muting configuration. The figure indicates the RE occupied by the CRS transmission. Thus, a total of 13 REGs are included in the RB shown in FIG. It should be noted that the distribution of the RS here is merely for explaining the REG mapping method described in the present invention, and does not mean that only this distribution mode will occur.
- mapping sequence of the first time direction and the backward frequency direction will be specifically explained below by taking FIG. 20 as an example. Specific algorithm As shown in Table 1. In Table 1,
- 0 ⁇ ' ⁇ M - l denotes a REG index
- M denotes the number of REGs mapped in the relay physical downlink control channel resource.
- ⁇ ⁇ ' ⁇ indicates the frequency domain subcarrier index, which is the starting subcarrier number of the relay physical downlink control channel resource, and is the ending subcarrier number of the relay physical downlink control channel resource.
- the antenna port number indicating the relay physical downlink control channel transmission in Table 1, that is, the relay physical downlink control channel can be transmitted by multiple antennas (for example, the transmission mode using the transmit diversity).
- the resource unit ⁇ ⁇ ) represents a REG assigned to the R-PDCCH, which means that the ', ') is the starting 1 £ of 1 £0, that is, the RE of the REs in the REs constituting the REG has the smallest RE.
- resource unit represents a REG allocated to the R-PDCCH, then perform steps 5 and 6, otherwise perform step 7;
- the determined FIG. 20 is determined.
- the mapping order of the REG is as shown by the reference numeral of the REG in the right portion of the broken line in FIG.
- the foregoing embodiment solves the problem of determining and mapping a relay link resource unit group.
- the control information may be directly carried according to the REG.
- the REG design described in the present invention fully considers the design of the REG in the presence of CRS, CSI-RS and DMRS on the relay link, and has less modification to the existing protocol, has better backward compatibility, and can solve the relay link.
- the problem of sending downlink control information is not limited to the transmission of the transmission.
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EP11840245.2A EP2640140A4 (en) | 2010-11-08 | 2011-11-03 | Method and apparatus for determining relay link resource element group |
JP2013536995A JP5759554B2 (ja) | 2010-11-08 | 2011-11-03 | リレーリンクリソース要素グループを確定する方法及び装置 |
US13/884,070 US9491757B2 (en) | 2010-11-08 | 2011-11-03 | Method and apparatus for determining relay link resource element group |
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EP2640140A1 (en) | 2013-09-18 |
CN102469589A (zh) | 2012-05-23 |
JP2014500649A (ja) | 2014-01-09 |
EP2640140A4 (en) | 2017-07-26 |
CN102469589B (zh) | 2015-06-03 |
JP5759554B2 (ja) | 2015-08-05 |
US20130223332A1 (en) | 2013-08-29 |
US9491757B2 (en) | 2016-11-08 |
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