WO2014012502A1 - Procédé pour la transmission et la réception d'un canal de commande sur la liaison descendante, et dispositif correspondant pour la mise en œuvre de ce procédé - Google Patents

Procédé pour la transmission et la réception d'un canal de commande sur la liaison descendante, et dispositif correspondant pour la mise en œuvre de ce procédé Download PDF

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Publication number
WO2014012502A1
WO2014012502A1 PCT/CN2013/079590 CN2013079590W WO2014012502A1 WO 2014012502 A1 WO2014012502 A1 WO 2014012502A1 CN 2013079590 W CN2013079590 W CN 2013079590W WO 2014012502 A1 WO2014012502 A1 WO 2014012502A1
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WIPO (PCT)
Prior art keywords
format
pdcch
network side
mtc
downlink control
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PCT/CN2013/079590
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English (en)
Chinese (zh)
Inventor
江小威
胡南
崔春风
吴伟民
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中国移动通信集团公司
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Publication of WO2014012502A1 publication Critical patent/WO2014012502A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a receiving method, and a corresponding device for transmitting a downlink control channel. Background technique
  • Machine-Type Communication refers to the communication between a machine and a machine (or device and device) without the need for human interaction.
  • FIG. 1 which is a schematic diagram of a communication scenario of an MTC device in the prior art, each MTC device communicates with an MTC server through an operator network, and each MTC device can send uplink data to the MTC server or downlink sent by the MTC server. Data, in which data is transmitted between the MTC device and the MTC server through the network side device.
  • the main factors affecting the cost of MTC equipment are the cost of the RF part and the baseband processing part, and the reduction of the bandwidth can greatly reduce the cost of the RF part of the analog-to-digital converter (ADC) and the amount of baseband processing. Therefore, studying the small bandwidth (1.4MHz) MTC technology has become the core strategy to reduce the cost of MTC equipment.
  • the MTC technology uses a dedicated 1.4MHz frequency, it has not been determined, but from the perspective of mobile operators, it is more advantageous to use H2H (Human To Human) technology and MTC technology to share bandwidth. It is more advantageous for mobile operators with insufficient spectrum resources.
  • H2H Human To Human
  • MTC technology sharing bandwidth is how to design the downlink control channel of MTC.
  • the existing downlink control channel includes: a physical downlink control channel (PDCCH, Physical a Downlink Control Channel, a Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH), and a Physical Control Format Indicator Channel (PCFICH), where the PCFICH is used to indicate that the PDCCH is occupied.
  • the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols is mainly adapted to the system load requirements of the dynamically variable (typically millisecond) system of the Long Term Evolution (LTE) system.
  • the format of the downlink control information (DCI, Downlink Control Information) supported by the existing PDCCH is: format 0, format 1/lA/lB/lC/lD, format 2/2 A, format 3/3 A.
  • Format 0 is used to transmit uplink resource indication information
  • format 1/1 A/1C is used for downlink single codeword resource indication
  • format 1B/1D and format 2/2A are used for multiple input multiple output (MIMO, Multiple-Input Multiple) -Output ) Spatial multiplexing
  • format 3/3 A for upstream power control.
  • the embodiments of the present invention provide a downlink control channel sending method, a receiving method, and a corresponding device, which are used to propose a downlink control channel design scheme applicable to the MTC technology.
  • a method for transmitting a downlink control channel includes: a network side device transmitting a downlink control channel to a machine type communication MTC device; wherein, a downlink control channel sent to the MTC device does not include a physical control format indication channel PCFICH, and the network side And the device and the MTC device pre-arrange the OFDM symbol occupied by the physical downlink control channel PDCCH, or the network side device notifies the OFDM symbol occupied by the PDCCH by using a system message broadcasted to the MTC device Said MTC equipment.
  • a network side device comprising: an obtaining unit, configured to obtain a downlink control channel to be sent to a machine type communication MTC device; and a sending unit, configured to send, to the MTC device, a downlink control channel obtained by the obtaining unit, where
  • the physical control format indication channel PCFICH is not included in the downlink control channel of the MTC device, and the network side device and the MTC device pre-arrange the physical The OFDM symbol occupied by the PDCCH of the PDCCH, or the transmitting unit notifies the OFDM symbol occupied by the PDCCH to the MTC device by using a system message broadcast to the MTC device.
  • a method for receiving a downlink control channel comprising: a machine type communication MTC device determines an orthogonal frequency division multiplexing OFDM symbol occupied by a downlink control channel sent by a network side device, where a network side device sends a downlink control channel to the MTC device
  • the physical control format indication channel PCFICH is not included, and the MTC device and the network side device pre-arrange the OFDM symbol occupied by the physical downlink control channel PDCCH, or the MTC device determines the PDCCH by using a system message broadcast by the network side device.
  • the occupied OFDM symbol receiving the downlink control channel sent by the network side device based on the determined OFDM symbol.
  • a device type communication device comprising: a symbol determining unit, configured to determine an orthogonal frequency division multiplexing OFDM symbol occupied by a downlink control channel sent by a network side device, where the network side device sends the downlink control channel to the MTC device
  • the physical control format indication channel PCFICH is not included, and the MTC device and the network side device pre-arrange the OFDM symbol occupied by the physical downlink control channel PDCCH, or the MTC device determines the PDCCH occupied by the system message broadcast by the network side device.
  • a receiving unit configured to receive, according to the OFDM symbol determined by the symbol determining unit, a downlink control channel sent by the network side device.
  • a method for transmitting a downlink control channel includes: when a network side device needs to send a physical downlink control channel PDCCH to a device type communication MTC device, in format 0, 1, 3, 3A of downlink control information DCI supported by the PDCCH, Selecting a DCI format, where the PDCCH corresponding to the DCI of the format 0 is used to indicate the uplink resource required for the uplink data to the MTC device, and the PDCCH corresponding to the DCI of the format 1 is used to indicate the downlink required for receiving the downlink data for the MTC device.
  • the PDCCH corresponding to the DCI of the resource 3, the format 3 and the format 3A is used to control the uplink power of the MTC device; and the network side device sends the PDCCH to the MTC device based on the format of the selected DCI.
  • a network side device comprising: a format selection unit, configured to: downlink control information supported by a PDCCH when a physical downlink control channel PDCCH needs to be sent to a machine type communication MTC device
  • a DCI format is selected, where the PDCCH corresponding to the DCI of the format 0 is used to indicate the uplink resource required for transmitting the uplink data for the MTC device, and the PDCCH corresponding to the DCI of the format 1 is used.
  • the PDCCH corresponding to the DCI of the format 3 and the format 3A is used to control the uplink power of the MTC device, and the sending unit is configured to select the format of the DCI based on the format selection unit. Sending a PDCCH to the MTC device.
  • the technical solution of the embodiment of the present invention provides a new downlink control channel design scheme applicable to the MTC.
  • the downlink control channel of the MTC does not include the PCFICH, and the network side device can pre-agreed the OFDM symbol occupied by the PDCCH with the MTC device, or the network side.
  • the device notifies the OFDM symbol occupied by the PDCCH to the MTC device by using a system message broadcasted to the MTC device, and the MTC device receives the network side device based on the OFDM symbol occupied by the PDCCH or the PDCCH that is notified by the network side device by the network side device.
  • the PDCCH sent. Since the downlink service of the MTC technology is very small, the overhead of the downlink control channel has little impact on the service.
  • the MTC service has a strong periodicity, and the change period is long.
  • the control resource indication accurate to the millisecond level wastes more processing.
  • the resource, and the bandwidth of the MTC is small, and the control resources are very tight. Therefore, the technical solution of the embodiment of the present invention proposes that the downlink control channel of the MTC does not include the PCFICH, which can effectively save more processing resources, and can effectively improve the downlink control channel. capacity.
  • the technical solution of the embodiment of the present invention also proposes a new downlink control channel design scheme applicable to the MTC.
  • the format 1B/1D and the format 2/2A are used for MIMO spatial multiplexing.
  • the MIMO technology is no longer used by the MTC. Therefore, the technical solution of the embodiment of the present invention proposes that the format of the DCI supported by the PDCCH no longer includes the format 1B/1D and the format 2/2A, and the type of the resource allocation mode used by the format 1 Type 1 or Type 2, and the type of resource allocation used by format 1A and format 1C is type 0. Since the bandwidth used by MTC is 1.4 MHz bandwidth, the three resource allocation modes cannot bring the gain of bit overhead.
  • the technical solution of the embodiment of the present invention proposes that the format of the DCI supported by the PDCCH does not include the format 1A/1C, and the network side device needs to send the PDCCH to the MTC device, and the PDCCH is in the PDCCH.
  • Supported DCI format 0, 1, 3, 3A select A format of the DCI, where the PDCCH corresponding to the DCI of the format 0 is used to indicate the uplink resource required for the uplink data to be used by the MTC device, and the PDCCH corresponding to the DCI of the format 1 is used to indicate the downlink resource required for receiving the downlink data for the MTC device.
  • the PDCCH corresponding to the DCI of the format 3 and the format 3A is used to control the uplink power of the MTC device, and the subsequent network side device may send the PDCCH to the MTC device according to the format of the selected DCI, because the technical solution of the embodiment of the present invention
  • the format of the DCI supported by the medium PDCCH no longer includes the format 1B/1D, the format 2/2A, and the format 1A/1C, so that the capacity of the downlink control channel can be effectively improved.
  • FIG. 1 is a schematic diagram of a communication scenario of an MTC device in the prior art
  • FIG. 2 is a schematic structural diagram of a downlink control channel with a granularity of REG according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a downlink control channel with a granularity of RE according to Embodiment 1 of the present invention
  • Medium a schematic diagram of the structure of the network side device
  • FIG. 5 is a schematic structural diagram of an MTC device according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic flowchart of a method for transmitting a downlink control channel according to Embodiment 2 of the present invention
  • FIG. 7 is a schematic structural diagram of a network side device according to Embodiment 2 of the present invention. detailed description
  • the existing downlink control channels include: PDCCH, PHICH, and PCFICH, where the PCFICH is used to indicate the number of OFDM symbols occupied by the PDCCH, and the existence thereof is mainly adapted to the system load requirement of the LTE system dynamically variable (generally millisecond).
  • PCFICH is used to indicate the control resource size of each subframe for the following reasons:
  • the downlink service of the MTC technology is very small.
  • the existing MTC applications (such as meter reading, smart home, etc.) are basically uplink services, and the overhead of the downlink control channel has little impact on the service;
  • the MTC service has a strong periodicity, and the change period is at least a second level.
  • MTC devices such as water meters and meters will report fixed bit data at intervals of tens of seconds or longer. Therefore, the control resource indication accurate to the millisecond level is unnecessary, and more processing resources are wasted;
  • the bandwidth of the MTC is small, and the number of devices is much larger than that of H2H communication, which makes the control resources particularly tense. If the PCFICH is reserved, it will bring a large waste of resources.
  • the embodiment of the present invention provides a method for transmitting a downlink control channel.
  • the downlink control channel of the MTC does not include the PCFICH, and only the PDCCH and the PHICH are included, and the network side device can directly send the downlink control channel to the MTC device.
  • the first embodiment of the present invention proposes two ways for the MTC device to learn the OFDM symbol occupied by the PDCCH, which is specifically described below.
  • the network side device may pre-agreed the OFDM symbol occupied by the PDCCH with the MTC device. For example, the network side device and the MTC device pre-approve that the PDCCH occupies 4 OFDM symbols, and set the positions of the 4 OFDM symbols, and the network side
  • the information about the OFDM symbol occupied by the pre-agreed PDCCH is stored in the device, including the location information of the OFDM symbol, and may further include the quantity information of the OFDM symbol.
  • the device may directly obtain the information of the pre-agreed OFDM symbol, and determine the OFDM symbol occupied by the PDCCH based on the obtained information of the OFDM symbol.
  • the network side device notifies the MTC device of the OFDM symbol occupied by the PDCCH by using a system message broadcast to the MTC device.
  • the network side device may allocate an OFDM symbol to the PDCCH sent to the MTC device according to the current resource usage, and then notify the MTC device of the allocated OFDM symbol by using a system message broadcast to the MTC device.
  • the network side device may be, but is not limited to, carrying the information of the OFDM symbol occupied by the PDCCH in a system information block (SIB, System Information Block) message or a MIB (Master Indication Block) message.
  • SIB System Information Block
  • MIB Master Indication Block
  • the MIB message or SIB message of the symbolic information is broadcast to the MTC device.
  • the information of the OFDM symbol includes location information of the OFDM symbol, and may further include quantity information of the OFDM symbol.
  • the first embodiment of the present invention further provides a method for receiving a downlink control channel, where the downlink control channel sent by the network side device does not include the PCFICH, and only the PDCCH and the PHICH are included, and the MTC device first determines the network. The OFDM symbol occupied by the downlink control channel sent by the side device, and then receiving the downlink control channel sent by the network side device based on the determined OFDM symbol.
  • the MTC device may pre-agreed the OFDM symbol occupied by the PDCCH with the network side device, and the MTC device may directly obtain the information of the pre-agreed OFDM symbol, and obtain the information according to the first manner of the OFDM symbol.
  • the information of the OFDM symbol determines the OFDM symbol occupied by the PDCCH.
  • the MTC device may determine the OFDM symbol occupied by the PDCCH by using a system message broadcast by the network side device.
  • the network message broadcasted by the network side device may be, but is not limited to, an MIB message or an SIB message, and the MTC device determines, according to the information of the OFDM symbol carried in the specified field of the MIB message or the SIB message broadcasted by the network side device, the network side device sends the The OFDM symbol occupied by the PDCCH.
  • the information of the OFDM symbol includes location information of the OFDM symbol, and may further include quantity information of the OFDM symbol.
  • the PDCCH of the MTC occupies 3 OFDM symbols, and the PHICH group occupies only one OFDM symbol as an example.
  • the structure of the downlink control channel with the granularity of the resource element group (REG, Resource Element Group) is as shown in FIG. 2, and the granularity is the resource.
  • the structure of the downlink control channel of the unit (RE, Resource Element) is as shown in FIG. 3.
  • the downlink control channel of the MTC does not include the PCFICH, and the network side device can pre-appoint the PDCCH with the MTC device.
  • the occupied OFDM symbol, or the network side device notifies the MTC device of the OFDM symbol occupied by the PDCCH by using a system message broadcasted to the MTC device, and the MTC device passes the system according to a pre-agreed or network-side device.
  • the OFDM symbol occupied by the PDCCH of the notification is received by the PDCCH transmitted by the network side device.
  • the technical solution of the first embodiment of the present invention proposes that the downlink control channel of the MTC does not include the PCFICH, which can effectively save more processing resources and can effectively improve the downlink control channel. Capacity.
  • the first embodiment of the present invention provides a network side device, and the structure thereof is as shown in FIG. 4, and includes:
  • the obtaining unit 41 is configured to obtain a downlink control channel to be sent to the MTC device.
  • the sending unit 42 is configured to send the downlink control channel obtained by the obtaining unit 41 to the MTC device, where the PCFICH is not included in the downlink control channel sent to the MTC device, and the network side device and the MTC device pre-arrange The OFDM symbol occupied by the PDCCH, or the transmitting unit 42 notifies the MTC device of the OFDM symbol occupied by the PDCCH by using a system message broadcast to the MTC device.
  • the sending unit 42 is configured to: carry the information of the OFDM symbol occupied by the PDCCH in a specified field of the SIB message or the MIB message, and broadcast the MIB message or the SIB message carrying the information of the OFDM symbol to the The MTC device.
  • an embodiment of the present invention provides an MTC device, and the structure thereof is as shown in FIG. 5, including:
  • the symbol determining unit 51 is configured to determine an OFDM symbol occupied by a downlink control channel sent by the network side device, where the network control device sends the PCFICH to the downlink control channel sent by the network device, where the MTC device and the network side The device pre-agreed the OFDM symbol occupied by the PDCCH, or the MTC device determines the OFDM symbol occupied by the PDCCH by using a system message broadcast by the network side device;
  • the receiving unit 52 is configured to receive the downlink control channel sent by the network side device based on the OFDM symbol determined by the symbol determining unit 51.
  • the symbol determining unit 51 is specifically configured to perform MIB cancellation according to the network side device broadcast.
  • the information of the OFDM symbol carried in the specified field of the information or the SIB message determines the OFDM symbol occupied by the PDCCH transmitted by the network side device.
  • the network side device in the first embodiment of the present invention can be, but is not limited to, a base station.
  • the formats of the DCI supported by the PDCCH are: format 0, formatl/lA/lB/lC/lD, format 2/2 A, format 3/3A.
  • Format 0 is used to transmit uplink resource indication information
  • format 1/1A/1C is used for downlink single codeword resource indication
  • format 1B/1D and format 2/2A are used for MIMO spatial multiplexing
  • format 3/3 A is used for Uplink power control, however, for MTC, the existing DCI design has the following problems:
  • the MTC For the MTC, many DCI formats do not need to be supported. Some fields in the PDCCH corresponding to the DCI are no longer needed, and the length of the field needs to be reduced.
  • the MTC will no longer use MIMO technology, so the format 1B/1D/2/2A It is no longer necessary, the type of resource allocation used by format 1 is type 1 or type 2, and the type of resource allocation used by format 1A and format 1C is type 0. Since MTC uses a narrow bandwidth of 1.4 MHz, Therefore, the three resource allocation modes cannot bring the gain of the bit overhead, and only one resource allocation mode is needed. In order to obtain sufficient frequency diversity gain, the uplink physical uplink shared channel (PUSCH, Physical Uplink Shared Channel) should be hopped. Always used;
  • the size of the Control Channel Element needs to be adjusted.
  • the MTC only needs to support the 1.4MHz bandwidth, and the number of bits of the DCI will be greatly reduced.
  • the MTC PDCCH will not be able to use the first three. OFDM symbols (because the first 3 OFDM symbols are occupied by the H2H PDCCH), plus the bandwidth limitation, the number of CCEs available in one subframe is very limited, so the PDCCH of the MTC needs to redefine the size of the CCE;
  • the MTC service and the H2H service may be mixed.
  • the existing time division duplex (TDD) ratio is mostly that the number of uplink subframes is smaller than the number of downlink subframes.
  • TDD time division duplex
  • the service composition has very few downlink services, so it is not necessary to reserve resources for the MTC in all downlink subframes.
  • the second embodiment of the present invention proposes that the DCI supported by the PDCCH
  • the format no longer contains format 1B/1D, format 2/2A, and format 1A/1C.
  • Step 61 When the network side device needs to send the PDCCH to the MTC device, select a DCI format in the format 0, 1, 3, and 3A of the DCI supported by the PDCCH.
  • the PDCCH corresponding to the DCI of the format 0 is used to indicate the uplink resource required for the uplink data to be used by the MTC device
  • the PDCCH corresponding to the DCI of the format 1 is used to indicate the downlink resource, format 3, and format required for receiving the downlink data for the MTC device.
  • the PDCCH corresponding to the DCI of 3A is used to control the uplink power of the MTC device.
  • the format 1B/1D and the format 2/2A are used for MIMO spatial multiplexing, and the MTC no longer uses the MIMO technology. Therefore, the second embodiment of the present invention proposes the DCI supported by the PDCCH.
  • the format no longer contains format 1B/1D and format 2/2A.
  • the type of resource allocation used by format 1 is type 1 or type 2
  • the type of resource allocation used by format 1A and format 1C is type 0. Since the bandwidth used by the MTC is 1.4 MHz, the three resource allocation modes cannot provide the gain of the bit overhead, and only one resource allocation mode is needed. Therefore, the second embodiment of the present invention proposes the DCI supported by the PDCCH.
  • the format also no longer contains format 1A/1C, where format 1 can use any of the resource allocation methods of type 0, type 1 and type 2.
  • the PDCCH corresponding to the DCI of format 0 may include the following information:
  • the field size is 5 bits; Modulation and Coding Scheme (MCS) and Hybrid Automatic Repeat Request (HARQ) redundancy version ( RV, Redundancy Version) information, the field size is 3bit; The new data indicates that the field size is lbit;
  • MCS Modulation and Coding Scheme
  • HARQ Hybrid Automatic Repeat Request
  • the field size is 2 bits
  • the uplink subframe position identifier which is only used for TDD0, and the size of the field is 2 bits.
  • ID of the downlink allocation number which is only used for TDD1 6, and the size of the field is 2 bits;
  • Channel indicator (CQI, Channel Quality Indicator) request identifier, the field size lbit; (Radio Network Temporary Identifier (RNTI) + Cyclic Redundancy Check (CRC) mod 2, the size of the field It is 16bit.
  • RNTI Radio Network Temporary Identifier
  • CRC Cyclic Redundancy Check
  • the above information occupies a total of 33 bits, and if it is less than 33 bits, it can be padded to 33 bits.
  • the format 0 in the second embodiment of the present invention cancels the field of the format 0 and the format 1, and the UE can pass different bit lengths.
  • the UE After the UE receives the PDCCH, if the bit length of the PDCCH is the bit length corresponding to the format 0 (for example, 33 bits), the UE confirms that the format of the DCI of the received PDCCH is format 0, if the PDCCH The bit length is the bit length corresponding to format 1 (for example, 35 bits), and the UE confirms that the format of the DCI of the received PDCCH is format 1; meanwhile, since the MTC bandwidth is narrow, the best way is to always use frequency hopping. Therefore, the format 0 in the second embodiment of the present invention cancels the field corresponding to the PUSCH hopping identifier. In addition, the format of the uplink MCS level supported by the MTC is greatly reduced. The size is reduced to 3 bits.
  • the PDCCH corresponding to the DCI of format 0 may include the following information:
  • Resource unit resource allocation information using the resource allocation mode of type 0, the field size is 6 bits;
  • the field size is 3 bit
  • the HARQ process number is 2 bits when the slot ratio mode is TDD mode.
  • the slot ratio mode is Frequency Division Dual (FDD) mode
  • the field size is 3 bits.
  • New data identifier the size of this field is l bit;
  • HARQ RV information the field size is 2 bits;
  • the field size is 2 bits
  • Downstream allocation number identifier only applicable to TDD1 6, the field size is 2bit;
  • this field is 16 bits in size.
  • the above information occupies 35 bits in total, and if it is less than 35 bits, it can be padded to 35 bits.
  • the format 1 in the second embodiment of the present invention reduces the HARQ process number and the number of bits of the field corresponding to the MCS.
  • the MTC For the shared carrier of the MTC and the H2H, the MTC must match the TDD ratio of the H2H. However, the TDDs 1 to 6 do not meet the characteristics of the MTC, which is the uplink service. If such a ratio is used, the MTC will waste a lot of downlink subframes. In order to ensure that the downlink subframe is not wasted, for the TDD downlink, the MTC can use the downlink subframes that can send the uplink resource grant, which also ensures that the uplink HARQ timing is not destroyed, and also reduces the required HARQ process. Number. For FDD, if the MTC is restricted, only partial frames are used.
  • Step 62 The network side device sends a PDCCH to the MTC device according to the format of the selected DCI.
  • the network side device sends the PDCCH to the MTC device based on the DCI of the format format 0, and indicates the uplink resource required by the UE in the PDCCH.
  • the network side device When the downlink data arrives at the network side device, the network side device sends the downlink data to the UE, and sends a PDCCH to the MTC device based on the DCI of the format format 1, and indicates, in the PDCCH, the downlink resource that the UE receives the downlink data.
  • the network side device can confirm whether the uplink power of the MTC device needs to be adjusted according to the CQI feedback of the user. If the adjustment needs to be performed, the PDCCH is sent to the MTC device according to the DCI of the format format 3/3A.
  • the PDCCH is modulated by a Quadrature Phase Shift Keying (QPSK) mode, and the format 0, format 1, and format 3/3 A are not exceeded.
  • QPSK Quadrature Phase Shift Keying
  • the second embodiment of the present invention proposes a new downlink control channel design scheme applicable to the MTC.
  • the format of the DCI supported by the existing PDCCH format 1B/1D and format 2/2A
  • the technical solution of the second embodiment of the present invention proposes that the format of the DCI supported by the PDCCH no longer includes the format 1B/1D and the format 2/2 A, and further, the format 1
  • the type of resource allocation used is type 1 or type 2
  • the type of resource allocation used by format 1A and format 1C is type 0. Since the bandwidth used by MTC is 1.4 MHz bandwidth, then three resource allocation methods are used.
  • the technical solution of the second embodiment of the present invention proposes that the format of the DCI supported by the PDCCH does not include the format 1A/1C, and the network side device needs
  • a DCI format is selected, where the DCI of the format 0
  • the PDCCH for the MTC device is used to indicate the uplink resource required for the uplink data
  • the PDCCH corresponding to the DCI of the format 1 is used to indicate the downlink resource required for receiving the downlink data for the MTC device, and the PDCCH corresponding to the DCI of the format 3 and the format 3A.
  • the subsequent network side device may send the PDCCH to the MTC device according to the format of the selected DCI, and the format of the DCI supported by the PDCCH in the second technical solution of the second embodiment of the present invention is no longer used.
  • the format 1B/1D, format 2/2A, and format 1A/1C are included, so that the capacity of the downlink control channel can be effectively improved.
  • the second embodiment of the present invention further provides a network side device, and the structure thereof is as shown in FIG. 7, and includes:
  • the format selection unit 71 is configured to: when the PDCCH needs to be sent to the MTC device, in the PDCCH In the formats 0, 1, 3, and 3A of the supported DCI, a format of the DCI is selected, where the PDCCH corresponding to the DCI of the format 0 is used to indicate the uplink resource required for the uplink data to the MTC device, and the DCI of the format 1 corresponds.
  • the PDCCH is used to indicate the downlink resource required for receiving the downlink data for the MTC device, and the PDCCH corresponding to the DCI of the format 3 and the format 3A is used to control the uplink power of the MTC device;
  • the sending unit 72 is configured to send a PDCCH to the MTC device according to a format of the DCI selected by the format selecting unit 71.
  • the PDCCH corresponding to the DCI of the format 0 does not include a field for distinguishing between format 0 and format 1A.
  • the PDCCH corresponding to the DCI of the format 0 does not include a field corresponding to the PUSCH hopping identifier.
  • the PDCCH corresponding to the DCI of the format 0 includes a field corresponding to the MCS, and the size of the field is 3 bits.
  • the PDCCH corresponding to the DCI of the format 1 includes a field corresponding to the HARQ process ID, wherein when the slot ratio mode is the TDD mode, the field size is 2 bits, and when the slot ratio mode is the FDD mode, The field size is 3 bits.
  • the PDCCH corresponding to the DCI of the format 1 includes a field corresponding to the MCS, and the size of the field is 3 bits.
  • the CCE of the PDCCH sent by the sending unit 72 to the MTC device includes 9 REGs.
  • the network side device in the second embodiment of the present invention may be, but is not limited to, a base station.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be applied to one or more A computer program product embodied on a computer usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • a computer usable storage medium including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

La présente invention se rapporte à un procédé adapté pour transmettre et recevoir un canal de commande sur la liaison descendante. L'invention se rapporte d'autre part à un dispositif correspondant adapté pour mettre en œuvre ledit procédé. Le procédé adapté pour transmettre un canal de commande sur la liaison descendante selon l'invention comprend les étapes suivantes : un dispositif sur le côté réseau transmet le canal de commande sur la liaison descendante à un dispositif de communication de type machine (MTC), le canal de commande sur la liaison descendante qui est transmis au dispositif MTC ne contenant pas de canal d'indication de format de canal de commande physique (PCFICH); ledit dispositif sur le côté réseau détermine au préalable un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) qui est occupé par le canal de commande physique sur la liaison descendante (PDCCH) avec le dispositif MTC, ou bien ledit dispositif sur le côté réseau transmet un symbole OFDM qui est occupé par le PDCCH, au dispositif MTC, via la transmission d'un message système, au dispositif MTC. La solution technique décrite dans la présente invention propose un schéma de conception d'un canal de commande sur la liaison descendante qui peut être mis en œuvre dans le domaine de la technologie MTC.
PCT/CN2013/079590 2012-07-18 2013-07-18 Procédé pour la transmission et la réception d'un canal de commande sur la liaison descendante, et dispositif correspondant pour la mise en œuvre de ce procédé WO2014012502A1 (fr)

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