WO2011103811A1 - 一种数据传输方法、基站和通信*** - Google Patents
一种数据传输方法、基站和通信*** Download PDFInfo
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- WO2011103811A1 WO2011103811A1 PCT/CN2011/071288 CN2011071288W WO2011103811A1 WO 2011103811 A1 WO2011103811 A1 WO 2011103811A1 CN 2011071288 W CN2011071288 W CN 2011071288W WO 2011103811 A1 WO2011103811 A1 WO 2011103811A1
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Classifications
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- 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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
Definitions
- a data transmission method, a base station, and a communication system The application is filed on February 25, 2010, and the application number is 201010117174. 8. The priority of the Chinese application entitled "a data transmission method, a base station, and a communication system" is preferred. The entire contents of which are incorporated herein by reference.
- the present invention relates to communication technologies, and in particular, to a data transmission technology.
- the base station of the communication system may perform channel estimation of the physical uplink data channel by using a DMRS (demodulation reference symbol) sequence transmitted by the UE (User Equipment User Equipment), and the base station uses the channel coefficient estimated by using the DMRS to carry the physical uplink data channel.
- the data information is demodulated.
- the demodulation reference signal transmitted by the user equipment is a sequence well known to both the base station and the user equipment, and the UE served by the base station needs to transmit a demodulation reference signal during uplink data transmission, and the demodulation reference signals transmitted by different UEs are orthogonal. of.
- the orthogonality of the demodulation reference signals transmitted by different UEs may be implemented by means of frequency division multiplexing, time division multiplexing, code division multiplexing or different cyclic shifts.
- the uplink data scheduling of the communication system or the downlink data scheduling may adopt a semi-persistent scheduling manner.
- a data transmission method comprising: Determining semi-persistent scheduling of data of the user equipment;
- a determining module configured to determine a semi-persistent scheduling of data of the user equipment
- a setting module configured to set a value of the first information for the user equipment, so that the user equipment determines the value according to the value of the first information a cyclic shift value of a reference signal sequence of the user equipment
- An acquisition and demodulation module configured to acquire a reference signal sequence of the user equipment, perform channel estimation according to a reference signal sequence of the user equipment, and perform data on the user equipment according to a channel coefficient obtained by performing the channel estimation. Information is demodulated.
- a communication system comprising: a base station, and a user equipment communicably coupled to the base station,
- the base station is configured to determine a semi-persistent scheduling of data of the user equipment, and set a value of the first information for the user equipment, so that the user equipment determines, according to the value of the first information, the user equipment. a cyclic shift value of the reference signal sequence;
- the base station, and the communication system provided by the foregoing method perform uplink data transmission in a manner of semi-persistent scheduling, different user equipments can perform data transmission on the same time-frequency resource, thereby improving spectrum utilization efficiency.
- FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present invention
- 2 is a flowchart of another data transmission method according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a communication system according to an embodiment of the present invention. detailed description
- LTE Long Term Evolution
- a data transmission method provided by an embodiment of the present invention is specifically described below with reference to FIG. As shown in Figure 1, the method can be: ⁇ .
- Step 101 Determine a semi-persistent scheduling of the data of the user equipment, and set a value of the first information for the user equipment, so that the user equipment determines the reference signal sequence of the user equipment according to the value of the first information.
- the cyclic shift value The cyclic shift value.
- Step 102 Acquire a reference signal sequence of the user equipment, perform channel estimation according to the reference signal sequence of the user equipment, and demodulate the data information of the user equipment according to the channel coefficient obtained by performing the channel estimation.
- the user equipment sends a Zadoff-Chu sequence to the base station.
- the cyclic shift value of the Zadoff-Chu sequence of the user equipment is determined by three parameters, namely RS , n ⁇ , " PRS( ) .
- "i ⁇ RS and " PRS are cell-specific parameters, and their specific values are determined by the system high-level letter.
- ⁇ RS is a user-specific (UE-specific) parameter whose specific value is the n-DMRS field in the PDCCH (Physical downlink control channel) for uplink data scheduling (demodulation)
- the reference signal cyclic shift indication field is indicated. If different UEs perform uplink data transmission on the same uplink time-frequency resource, the uplink reference signal sequences of these UEs must have different cyclic shifts. The values, that is, the values of these UEs must be different from each other.
- the base station For data transmission using uplink semi-persistent scheduling, the base station utilizes semi-persistent scheduling
- the PDCCH performs resource scheduling for the initial data transmission block of the UE, and the UE transmits the data transmission block according to the period configured by the system high layer signaling, and the time-frequency resource occupied by the UE by default is not occupied by the initial data transmission block and the initial data transmission block.
- the time-frequency resources are the same.
- the value of the 3-bit n-DMRS field in the semi-persistent scheduling PDCCH is set to a fixed value of 000.
- the base station needs to determine the physical hybrid retransmission indication channel PHICH channel corresponding to the data transmission block for the UE according to the index of the first starting physical resource block and the n-DMRS bit field occupied by the uplink data transmission block of the UE. index of.
- the PHICH channel carries the response information of whether the data transmission block transmitted by the base station to the UE is correctly received by the base station.
- the base station If the base station correctly receives the data transmission block sent by the UE, the base station feeds back the ACK to the UE through the PHICH channel; otherwise, if the base station does not correctly receive the data transmission block sent by the UE, the base station feeds back the NACK to the UE through the PHICH channel, and the UE receives the After the NACK information, if the transmission of the data transmission block does not reach the maximum number of retransmissions allowed by the system, the UE repeatedly transmits the data transmission block.
- Step 201 Determine semi-persistent scheduling of data of the user equipment.
- Step 202 Set a value of the first information for the user equipment, so that the user equipment determines a cyclic shift value of the reference signal sequence of the user equipment according to the value of the first information.
- the first information may be a value of the n-DMRS;
- the setting the value of the first information for the user equipment may include: sending, to the user equipment, radio resource control signaling, where the radio resource control signaling includes second information, by setting the second information And a mapping relationship between the value and the value of the first information, where the value of the first information is set for the user equipment; specifically, in the existing LTE system, when the data transmission is performed by using the uplink semi-persistent scheduling mode, the RRC may be used in the RRC.
- a new field, such as m-DMRS, is added to the (Radio resource control) signaling to indicate or determine the value of the field n-DMRS in the PDCCH for the UE.
- the m-DMRS may be the second information described above.
- the correspondence between the value of m-DMRS and the value of n-DMRS can be as shown in Table 1, Table 2, or Table 3.
- Table 1 shows the correspondence between the value of m-DMRS and the value of n-DMRS when the length of the m-DMRS field is 1 bit;
- Table 2 shows the value of m-DMRS when the length of the m-DMRS field is 2 bits.
- Table 3 shows the correspondence between the value of the m-DMRS and the value of the n-DMRS when the length of the m-DMRS field is 3 bits.
- the base station can set different n-DMRS values by using different values of the m-DMRS, so that the reference signal sequences of the different UEs have different reference signal cyclic shift values, and the UE is guaranteed.
- the orthogonality of the reference signal sequence is not limited.
- the base station determines the value of the n-DMRS according to the m-DMRS, and determines the PHICH channel index for the UE according to the PHICH (Physical Hybrid Indicator Channel) mapping rule, and the value of the n-DMRS determined by the UE according to the m-DMRS.
- AC ACK detection is performed on the determined PHICH channel.
- the PHICH channel corresponding to the uplink data transmission block is determined on the same downlink carrier, the PHICH channel collision corresponding to the uplink data transmission block of the UE may be avoided.
- the setting the value of the first information to the user equipment may include: determining, by the first information, a demodulation reference signal cyclic shift indication field of three bits in a physical downlink control channel, by setting the demodulation reference One or two bits in the signal cyclic shift indication field are fixed values, and the value of the first information is set for the user equipment.
- the n-DMRS field in the PDCCH may be used to indicate the value of the n-DMRS of different UEs, that is, the base station may not set the 3-bit n-DMRS field in the PDCCH. Is in a fixed state.
- the base station may set different n-DMRS states for the UE in the PDCCH, so that the reference signal sequence of the UE has different reference signal cyclic shifts.
- the value guarantees the orthogonality of the reference signal sequence of the above UE.
- the state of the first bit in the 3-bit n-DMRS field may be unfixed, and the second and third bit states may be fixed to zero.
- the n-DMRS field according to the above setting may indicate two values, one UE using the value 000 and the other UE using the value 100.
- the base station indicates, according to the value of the n-DMRS, a cyclic shift value of the uplink reference signal sequence and follows the PHICH mapping rule of the LTE. Then, the PHICH channel index corresponding to the uplink data transmission block of the UE is determined, and the UE performs ACK/NACK detection on the PHICH channel determined by the base station according to the n-DMRS state.
- the state of the first and second bits in the 3-bit n-DMRS field may also be unfixed, and the third bit state is fixed to zero. Then, according to the above-set n-DMRS field, four values can be indicated.
- Setting the value of the first information for the user equipment may include: setting a padding bit of the physical downlink control channel, and mapping a value of the padding bit to a value of the first information, where the user equipment is Set the value of the first message.
- the load size of a PDCCH for scheduling uplink data transmission is smaller than the load size of a PDCCH for scheduling downlink data transmission.
- the LTE system specifies that the load size of the PDCCH for scheduling uplink data transmission is equal to the PDCCH load size for scheduling downlink data transmission.
- the padding bits added in the PDCCH scheduling the uplink data transmission may be used to determine the value of the n-DMRS for different UEs. J ⁇ port, when the length of the adding bits is 1 bit, the mapping relationship between the value of adding bits and the value of n-DMRS can be as shown in Table 4, and Table 4 is replaced by the m-DMRS field in Table 1. Get it after padding bits.
- the mapping relationship between the value of the padding bits and the value of the n-DMRS when the length of the padding bits is 2 or 3 bits can be obtained.
- the base station uses the value of the n-DMRS indicated by the padding bits and determines the PHICH channel index corresponding to the uplink data transmission block of the UE according to the PHICH mapping rule of the LTE, and the UE selects the PHICH channel for the base station according to the value of the n-DMRS. Perform ACK/NACK detection on it.
- Setting the value of the first information for the user equipment may be included in the single-user multi-codeword transmission mode, by setting the physical downlink control channel of the single-user multi-codeword transmission mode relative to the single-user single-codeword A value of a field added by the physical downlink control channel, and a mapping relationship between the value of the added field and the value of the first information, and setting a value of the first information for the user equipment.
- the PDCCH scheduling uplink single-user multi-codeword transmission adds some new fields to the PDCCH of the scheduled single-codeword, such as a PMI (precoding matrix indicator) field, an n-DMRS field of codeword 2, or a difference. Field, RI (Rank indication) field, etc.
- a new field in the PDCCH of the semi-persistently scheduled multi-codeword format, or a partial bit in the newly added field, or a combination of new fields may be utilized. Or add the redundancy status of the field to indicate the value of the n-DMRS for the UE.
- k-DMRS To define a new field (or a partial bit in a new field, or a combination of new fields, or a redundant state of a new field) as k-DMRS, then the mapping relationship between k-DMRS and n-DMRS values can be seen. The process of establishing a mapping relationship between the value of padding bits and the value of n-DMRS.
- the base station indicates the value of the n-DMRS according to the newly added field in the PDCCH of the multi-codeword format, or the partial bit in the newly added field, or the combination of the newly added field, or the redundancy status of the newly added field.
- the UE determines a cyclic shift value of the uplink reference signal sequence, and determines a PHICH channel index corresponding to the uplink data transmission block of the UE according to the PHICH mapping rule of the LTE, and the UE performs the PHICH channel determined by the base station according to the n-DMRS state.
- ACK/NACK detection is a cyclic shift value of the uplink reference signal sequence, and determines a PHICH channel index corresponding to the uplink data transmission block of the UE according to the PHICH mapping rule of the LTE.
- the setting the value of the first information to the user equipment may include: setting, in a carrier aggregation scenario, a value of a carrier indication field in a physical downlink control channel, and a value of the carrier indication field and the first information
- the value mapping relationship is used to set the value of the first information for the user equipment.
- carrier aggregation technology is supported.
- the PDCCH on one downlink carrier is allowed to cross-carrier to schedule data resources on other downlink or uplink carriers. Therefore, in a scenario of cross-carrier scheduling, a 3-bit carrier indication field is added to the PDCCH structure, and a carrier indication field in the PDCCH is used to indicate an index of the scheduled downlink or uplink carrier.
- one or more bits in the CIF field in the PDCCH may be used to indicate the value of the n-DMRS for the UE, and a mapping relationship between one or more bits in the field and the value of the n-DMRS may be established. See Table 1 and Table 2. Or, in a carrier aggregation scenario, obtaining a different value that can be indicated by the carrier indication field in a carrier indication field in a physical downlink control channel, and a redundancy value used to indicate a value of a different carrier, and And setting a value of the first information for the user equipment by setting a mapping relationship between the redundancy value and a value of the first information.
- n-DMRS may be set for different UEs in a redundant state in the CIF field. For example, if an UE uplink semi-persistent scheduling PDCCH can cross-carrier scheduled uplink carrier index range is A, then B in the CIF field can be utilized. Bits to set the value of the n-DMRS for the UE. among them:
- Ceil is an up-rounding function.
- the mapping relationship between the value of the B bits and the value of the n-DMRS is as shown in Table 1, Table 2, or Table 3, replacing the m-DMRS field in Table 1, Table 2, or Table 3 with B bits. Field.
- the value of the n-DMRS field in the PDCCH may not be set to a fixed value, the value of the n-DMRS field is used to set the value of the n-DMRS, and one or more bits in the CIF field in the PDCCH are The value is set to a fixed state to reduce the PDCCH false alarm detection probability.
- Step 203 Obtain a reference signal sequence of the user equipment, perform channel estimation according to the reference signal sequence of the user equipment, and demodulate the data information of the user equipment according to the channel coefficient obtained by performing the channel estimation.
- the base station includes: a determining module 301, a setting module 302, and an obtaining and demodulating module 303.
- the determining module 301 is configured to determine semi-persistent scheduling of data of the user equipment.
- the setting module 302 is configured to set a value of the first information for the user equipment, so that the user equipment determines a cyclic shift value of the reference signal sequence of the user equipment according to the value of the first information.
- the acquiring and demodulating module 303 is configured to acquire a reference signal sequence of the user equipment, perform channel estimation according to the reference signal sequence of the user equipment, and use the channel coefficient obtained by performing the channel estimation on the user.
- the data information of the device is demodulated.
- the setting module 302 includes a first setting unit, a second setting unit, a third setting unit, a fourth setting unit, or a fifth setting unit.
- the first setting unit is configured to send radio resource control signaling to the user equipment, where the radio resource control signaling includes second information, and the set value of the second information is related to the first information.
- the second setting unit is configured to: if the first information is determined by a demodulation reference signal cyclic shift indication field of three bits in a physical downlink control channel, by setting the demodulation reference signal cyclic shift indication field One or two bits in the bit are fixed values, and the value of the first information is set for the user equipment.
- the third setting unit is configured to set a value of the first information for the user equipment by setting a padding bit of the physical downlink control channel and a mapping relationship between the value of the padding bit and the value of the first information.
- the fourth setting unit is configured to increase the physical downlink control channel of the single-user multi-codeword transmission mode with respect to a physical downlink control channel of a single-user single codeword in a single-user multi-codeword transmission mode. a value of the field, and a mapping relationship between the value of the added field and the value of the first information, setting a value of the first information for the user equipment.
- the fifth setting unit is configured to: set a value of a carrier indication field in a physical downlink control channel, and a mapping relationship between a value of the carrier indication field and a value of the first information in a carrier aggregation scenario, where Setting the value of the first information by the user equipment; or, in the carrier aggregation scenario, acquiring different values that can be indicated by the carrier indication field in the carrier indication field in the physical downlink control channel, with respect to the carrier indication field.
- a redundancy value indicating a value of a different carrier, and setting a value of the first information for the user equipment by setting a mapping relationship between the redundancy value and a value of the first information.
- the base station further includes: a second determining module.
- the second determining module is configured to indicate a channel according to a physical mixing according to the value of the first information
- the mapping rule is that the user equipment determines a channel index of a physical hybrid indication channel corresponding to the uplink data transmission block of the user equipment.
- the division of the device module in the embodiment of the present invention is a functional division, and the actual specific structure may be the splitting or merging of the above functional modules.
- the term "receiving" in the above embodiments of the invention may be understood as actively acquiring information from other units or receiving information transmitted by other units.
- the serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The solution described in the claims is also the scope of protection of the embodiments of the present invention.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP11746853.8A EP2541802B1 (en) | 2010-02-25 | 2011-02-25 | Method for data transmission, base station and communications system |
BR112012021511A BR112012021511A2 (pt) | 2010-02-25 | 2011-02-25 | unidade para distribuição um produto fluido e dispositivo para distribuição de um produto fluido compreendendo tal unidade |
US13/593,958 US8897164B2 (en) | 2010-02-25 | 2012-08-24 | Data transmission method, base station, and communication system |
Applications Claiming Priority (2)
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CN201010117174.8 | 2010-02-25 | ||
CN201010117174.8A CN102170702B (zh) | 2010-02-25 | 2010-02-25 | 一种数据传输方法、基站和通信*** |
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US13/593,958 Continuation US8897164B2 (en) | 2010-02-25 | 2012-08-24 | Data transmission method, base station, and communication system |
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PCT/CN2011/071288 WO2011103811A1 (zh) | 2010-02-25 | 2011-02-25 | 一种数据传输方法、基站和通信*** |
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US (1) | US8897164B2 (zh) |
EP (1) | EP2541802B1 (zh) |
CN (1) | CN102170702B (zh) |
BR (1) | BR112012021511A2 (zh) |
WO (1) | WO2011103811A1 (zh) |
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EP2541802B1 (en) | 2016-04-13 |
US8897164B2 (en) | 2014-11-25 |
CN102170702B (zh) | 2014-07-30 |
EP2541802A1 (en) | 2013-01-02 |
BR112012021511A2 (pt) | 2016-07-05 |
US20120327886A1 (en) | 2012-12-27 |
CN102170702A (zh) | 2011-08-31 |
EP2541802A4 (en) | 2013-02-27 |
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