JP2014057309A - Data transmission method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission method and device for improving transmission quality of downlink data and a reference signal.SOLUTION: A transmission method includes: a step for segmenting at least one orthogonal frequency division multiplex (OFDM) symbol pair from a time-frequency resource in a current sub frame, configuring a RE (resource element) pair from two resource elements neighboring within an identical subcarrier within an identical OFDM symbol pair, setting at least one RE pair as a reference signal RE pair, and setting at least one RE pair, except the reference symbol RE pair, as a data RE pair; a step for adding first cyclic guard interval periods before first REs within the reference signal RE pair and within the data RE pair, at a time of generating a transmission signal associated with an OFDM symbol; a step for adding second cyclic guard interval periods after second REs within the reference signal RE pair and within the data RE pair; and a step for configuring a transmission signal corresponding to a generated OFDM symbol as a transmission frame, and sending the frame.

Description

  The present invention relates to mobile communication technology, and more particularly to a data transmission method and apparatus.

  Orthogonal frequency division multiplexing (OFDM) technology is widely applied in mobile radio communication systems. The 3GPP Long-Term Evolution (LTE) mobile communication system also adopts OFDM, which is used as the transmission technology for the air interface of the downlink transmission physical layer. In a radio communication system based on OFDM, transmission is generally performed by adding a cyclic prefix (CP) to each OFDM symbol. The CP is a copy of the signal at the end of the OFDM symbol, and is transmitted by adding it before the OFDM symbol at the time of transmission. As a guard period, a certain intersymbol interference resistance is added to the OFDM system. Give ability. When the multipath delay of the radio channel is smaller than the length of the CP, the multipath of the radio channel does not cause OFDM intersymbol interference, and the system performance is not affected by the multipath.

  Therefore, in order to obtain good communication link quality in a communication system based on OFDM, it is necessary to design the length of the CP in consideration of the distribution of the radio channel multipath delay extension in the application scenario. In the LTE standard, two types of frame structures are defined, and they are adapted to different application scenarios using a normal cyclic prefix length and an extended cyclic prefix length, respectively. However, these two types of frame structures are greatly different and have certain limitations because they cannot be applied simultaneously to different time frequency resources of signals transmitted at the same carrier frequency.

  For example, in mobile communication application scenarios such as very large cells for communication recovery after a disaster and mobile communication cells located in mountainous areas, the channel of some users in the cell has a large delay extension While possible, the channel environment of other users is relatively good. Therefore, a more flexible technique is required for such an application scenario so that services can be simultaneously provided to users in different channel environments.

  An improved cyclic guard period addition method (herein abbreviated as PS-OFDM technology) is proposed in a Chinese patent application with application number 200780036215.7. In this method, for the odd-numbered OFDM symbol, the signal at the end of the OFDM symbol is duplicated and added before the OFDM symbol as a cyclic guard period, and for the even-numbered OFDM symbol, the beginning of the OFDM symbol. A portion of the signal is duplicated and added after the OFDM symbol as a cyclic guard period. In this way, when transmitting different signals with two OFDM symbols, the PS-OFDM system has the same ability to resist intersymbol interference as the traditional OFDM system, while transmitting the same signal with two OFDM symbols. In this case, by using PS-OFDM technology, the phase of two OFDM symbols can be made continuous, thereby equivalently forming an OFDM symbol with a longer cyclic prefix (CP). In this way, it is possible to resist intersymbol interference when the radio channel delay extension is large.

  Since the PS-OFDM technique does not change the length of the cyclic prefix in the frame structure, it can be more easily applied to a conventional OFDM system.

  The present invention proposes a data transmission method, and proposes a data transmission apparatus, thereby applying PS-OFDM technology to an LTE wireless communication system and improving link quality of downlink data and reference signals.

  A data transmission method according to the present invention, wherein at least one orthogonal frequency division multiplexing (OFDM) symbol pair is partitioned from time frequency resources of a current subframe, and each OFDM symbol pair is adjacent to each other in time. An OFDM symbol is included, OFDM symbols in different OFDM symbol pairs do not overlap, and two resource elements (RE) adjacent to each other in the same subcarrier in the same OFDM symbol pair constitute one resource element pair, and at least 1 One resource element pair is set as a reference signal resource element pair, and in the reference signal resource element pair, the first setting reference signal is mapped in a manner that the data in the two resource elements is the same, and the reference signal resource element pair Other resources other than At least one resource element pair is set as a data resource element pair, one or two data symbols are mapped in the data resource element pair, and one data symbol is mapped in the data resource element pair If the data symbols are mapped in the same manner in the two resource elements, and the two data symbols are mapped in the data resource element pair, the two data symbols are converted into two resource elements. Map each other, map other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair, When the transmission signal corresponding to the signal is generated, the reference signal resource element pair and the data resource element pair in the OFDM symbol pair are preceded by the first resource element in the reference signal resource element pair and the data resource element pair. Adding a first cyclic guard period in which a signal at the end of the time domain signal corresponding to the first resource element is duplicated, after the second resource element in the reference signal resource element pair and the data resource element pair And adding a second cyclic guard period obtained by duplicating the signal of the head part of the time domain signal corresponding to the second resource element, configuring a transmission signal corresponding to the generated OFDM symbol as a transmission frame, and transmitting the transmission Send frames Including.

  In one embodiment of the present invention, the method generates a transmission signal corresponding to an OFDM symbol with respect to other resource elements other than the reference signal resource element pair and the data resource element pair before each resource element. The method further includes adding a first circulation guard period.

  In one embodiment of the present invention, generating a transmission signal corresponding to the OFDM symbol includes, for each OFDM symbol pair, a signal at the end of the first OFDM symbol before the first OFDM symbol. A duplicated first cyclic guard period is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and a signal at the beginning of the second OFDM symbol is added after the second OFDM symbol. Adding a duplicated second cyclic guard period to form a transmission signal of the second OFDM symbol of the OFDM symbol pair, and other resources other than the reference signal resource element pair and the data resource element pair Before mapping other transmission target data in the element, in the OFDM symbol pair When the transmission signal corresponding to the OFDM symbol is generated by compensating the phase of the first other transmission target data to be mapped to the th resource element, the first other transmission target data It further includes adding a first circulation guard period before.

  In one embodiment of the present invention, generating a transmission signal corresponding to the OFDM symbol includes, for each OFDM symbol pair, a signal at the end of the first OFDM symbol before the first OFDM symbol. A duplicated first cyclic guard period is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and the second OFDM symbol of the OFDM symbol pair is replaced with all reference signal resource element pairs and The second resource element in the data resource element pair is included, the first part of the OFDM symbol padded with 0s at the position corresponding to the other resource element, and the other resource element are included, and the reference signal resource element pair and Second resource element in the data resource element pair Are processed in two parts, the second part of the OFDM symbol padded with zeros, and the second cyclic guard period is added after the first part of the OFDM symbol, The first cyclic guard period is added before the two parts of the OFDM symbol, and then the two parts of the OFDM symbols are added to form the transmission signal of the second OFDM symbol of the OFDM symbol pair. , Including that.

  In one embodiment of the present invention, partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe includes physical layer control channel resource, indication channel resource, physical layer broadcast channel resource, synchronization in a frame structure. Based on the position of any one or any combination of a signal resource, a cell reference signal resource, a demodulation reference signal resource, and a channel state information reference signal resource, the partitioned OFDM symbol pair includes the physical layer control channel, It does not affect the information transmission of any one or any combination of the indication channel and the physical layer broadcast channel, and / or among the synchronization signal, cell reference signal, demodulation reference signal, channel state information reference signal Any one or any combination of transmissions So as not to include the time-frequency resources for the current sub-frame, it divides the at least one OFDM symbol pairs, that.

  In an embodiment of the present invention, the setting of the at least one resource element pair as a reference signal resource element pair includes at least one resource element pair in each subcarrier of a predetermined resource block as a reference signal resource element pair. Including setting.

  In one embodiment of the present invention, setting the at least one resource element pair as a reference signal resource element pair includes physical layer control channel resource, indication channel resource, physical layer broadcast channel resource, synchronization signal resource in a frame structure, Based on the position of a resource element in any one or any combination of a cell reference signal resource, a demodulation reference signal resource, and a channel state information reference signal resource, an OFDM symbol pair partitioned from a predetermined resource block In the case where usable resource element pairs are set and there are two or more usable resource element pairs in one subcarrier of the predetermined resource block, at least one usable resource element in the subcarrier is set. The door-to-set as a reference signal resource elements pairs includes.

  In one embodiment of the present invention, a main synchronization signal, a sub-synchronization signal, a physical layer broadcast channel, and an uplink / downlink switching guard period (GP) are not transmitted in the time frequency resource of the current subframe. , A resource block for transmitting a physical layer control channel, a cell reference signal, and a channel state information reference signal is included, and the resource block has an OFDM symbol as an abscissa in order of the transmission time of the OFDM symbol. Arranged from left to right, with subcarriers as ordinates, arranged from top to bottom in descending order of subcarrier frequency, and classifies at least one OFDM symbol pair from the time-frequency resource of the current subframe Performing the third OFDM symbol and the fourth OFDM symbol from the left from the resource block in the first OFDM symbol. As the Vol pair, the sixth and seventh OFDM symbols are the second OFDM symbol pair, the eighth and ninth OFDM symbols are the third OFDM symbol pair, and the tenth and eleventh OFDM symbols are the fourth OFDM symbol. Partitioning the thirteenth and fourteenth OFDM symbols as a fifth OFDM symbol pair as an OFDM symbol pair, and setting the at least one resource element pair as a reference signal resource element pair includes: The resource element pairs in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the OFDM symbol pair are set as reference signal resource element pairs, and below the fifth OFDM symbol pair. 1st, 3rd, 5th, 7th, 9th, The resource element pairs in beauty 11 th subcarrier, is set as the reference signal resource elements pairs includes.

  In one embodiment of the present invention, the time frequency resource of the current subframe does not transmit a main synchronization signal, a physical layer broadcast channel, and an uplink / downlink switching guard period (GP), , A resource block for transmitting a physical layer control channel, a cell reference signal, and a channel state information reference signal is included, and the resource block has an OFDM symbol as an abscissa in order of the transmission time of the OFDM symbol. Arranged from left to right, with subcarriers as ordinates, arranged from top to bottom in descending order of subcarrier frequency, and classifies at least one OFDM symbol pair from the time-frequency resource of the current subframe Performing the third and fourth OFDM symbols from the left from the resource block in the first OFDM symbol. As the Vol pair, the sixth and seventh OFDM symbols are the second OFDM symbol pair, the eighth and ninth OFDM symbols are the third OFDM symbol pair, and the tenth and eleventh OFDM symbols are the fourth OFDM symbol. Partitioning the twelfth and thirteenth OFDM symbols as a fifth OFDM symbol pair as an OFDM symbol pair, and setting the at least one resource element pair as a reference signal resource element pair includes: The resource element pairs in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the OFDM symbol pair are set as reference signal resource element pairs, and below the fourth OFDM symbol pair. 1st, 3rd, 5th, 7th, 9th, The resource element pairs in beauty 11 th subcarrier, is set as the reference signal resource elements pairs includes.

  In one embodiment of the present invention, the current subframe is a special subframe including a downlink pilot transmission time slot, an uplink / downlink switching guard period (GP), and an uplink pilot transmission time slot. In the time frequency resource, the sub-synchronization signal and the physical layer broadcast channel are not transmitted, but the main synchronization signal, the physical layer control channel, the cell reference signal, and the channel state information reference signal are transmitted. The first resource block includes an OFDM symbol as an abscissa and is arranged from left to right in the order of transmission time of the OFDM symbol, and a subcarrier is an ordinate, Are arranged from top to bottom in descending order of time, and from the time frequency resources of the current subframe, In the first resource block, the fourth and fifth OFDM symbols from the left are defined as the first OFDM symbol pair, and the sixth and seventh OFDM symbols are defined as the second OFDM symbol. Partitioning the 8th and 9th OFDM symbols as a third OFDM symbol pair, and the 10th and 11th OFDM symbols as a 4th OFDM symbol pair, Setting resource element pairs as reference signal resource element pairs means that resource element pairs in the second, sixth, eighth, and twelfth subcarriers from the bottom of the first OFDM symbol pair in the first resource block. As a reference signal resource element pair And setting resource element pairs in the first, third, fifth, seventh, ninth and eleventh subcarriers from the bottom of the fourth OFDM symbol pair as reference signal resource element pairs. .

  In one embodiment of the present invention, the time frequency resource of the current subframe does not transmit a main synchronization signal, a sub synchronization signal, and a physical layer broadcast channel, but a physical layer control channel, a cell reference signal, A second resource block for transmitting a channel state information reference signal is further included, and the second resource block is arranged from left to right in the order of OFDM symbol transmission time with the OFDM symbol as an abscissa. The subcarriers are arranged from the top to the bottom in the descending order of the subcarrier frequency with the ordinate as the ordinate, and the at least one OFDM symbol pair is distinguished from the time-frequency resource of the current subframe. From the second resource block, the fourth and fifth OFDM symbols from the left are defined as the first OFDM symbol pair, and 6 Partition the first and seventh OFDM symbols as a second OFDM symbol pair, the eighth and ninth OFDM symbols as a third OFDM symbol pair, and the tenth and eleventh OFDM symbols as a fourth OFDM symbol pair And setting the at least one resource element pair as a reference signal resource element pair is second, sixth, eighth from the bottom of the first OFDM symbol pair in the second resource block, And the resource element pair in the 12th subcarrier is set as a reference signal resource element pair, and the first, third, fifth, seventh, ninth, and eleventh subordinates from the bottom of the fourth OFDM symbol pair. The resource element pair in the carrier is referred to as the reference signal resource element. Set as instrument pair includes.

  In one embodiment of the present invention, the time synchronization resource of the current subframe does not transmit a main synchronization signal and an uplink / downlink switching guard period (GP), but a physical layer broadcast channel and a physical layer control channel A resource block that transmits a cell reference signal, a channel state information reference signal, a demodulation reference signal, and a sub-synchronization signal, and the resource block transmits an OFDM symbol with the OFDM symbol as an abscissa Arranged from left to right in chronological order, subcarriers as ordinate, and arranged from top to bottom in descending order of subcarrier frequency. From the time-frequency resource of the current subframe, at least one The division of the OFDM symbol pair includes the third and fourth OFDM symbols from the left from the resource block. Partitioning the sixth and seventh OFDM symbols as a second OFDM symbol pair and the twelfth and thirteenth OFDM symbols as a third OFDM symbol pair as one OFDM symbol pair, Setting one resource element pair as a reference signal resource element pair means that resource element pairs in the third, sixth, ninth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are referred to as reference signal resource elements. Setting as a pair, and setting resource element pairs in the second, fifth, eighth, and eleventh subcarriers from the bottom of the third OFDM symbol pair as reference signal resource element pairs.

  In one embodiment of the present invention, the other transmission target data includes at least one of a cell reference signal, a channel state information reference signal, and data demodulated using the cell reference signal.

  In one embodiment of the present invention, the first configuration reference signal includes at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal, and from the time-frequency resource of the current subframe, Separating at least one OFDM symbol pair brings the position of the OFDM symbol pair close to the position of the OFDM symbol used by the first configuration reference signal in LTE, and the number of OFDM symbol pairs in the LTE Partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe according to the principle of matching the number of OFDM symbols used by the configured reference signal, wherein the at least one resource element pair is referred to as a reference signal resource Setting as an element pair is a reference signal resource The position of the element pair is close to the position of the resource element used by the first setting reference signal in LTE, and the number of reference signal resource element pairs is set to the number of resource elements used by the first setting reference signal in LTE. Setting at least one resource element pair as a reference signal resource element pair according to a matching principle.

  In one embodiment of the present invention, the first configuration reference signal includes a cell reference signal, and distinguishing at least one OFDM symbol pair from the time-frequency resource of the current subframe is an abscissa of the OFDM symbol. And for each resource block arranged from left to right in the order of old OFDM symbol transmission time, subcarriers as ordinates, and from top to bottom in descending order of subcarrier frequency. The first and second OFDM symbols from the left of the first OFDM symbol pair, the third and fourth OFDM symbols as the second OFDM symbol pair, and the fifth and sixth OFDM symbols as the third OFDM symbol As the symbol pair, the 8th and 9th OFDM symbols are converted into the 4th OFDM symbol pair. Partitioning the tenth and eleventh OFDM symbols as a fifth OFDM symbol pair and the twelfth and thirteenth OFDM symbols as a sixth OFDM symbol pair, the at least one resource element pair Is set as a reference signal resource element pair, the resource element pairs in the first and seventh subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs corresponding to the first antenna port. Then, a resource element pair in the fourth and tenth subcarriers from the bottom of the third OFDM symbol pair is set as a reference signal resource element pair corresponding to the first antenna port, and below the fourth OFDM symbol pair. 1st and 7th sub Are set as reference signal resource element pairs corresponding to the first antenna ports, and the resource element pairs in the fourth and tenth subcarriers from the bottom of the sixth OFDM symbol pair are set to the first A reference signal resource element pair corresponding to the antenna port is set as a reference signal resource element pair corresponding to the antenna port, and a resource element pair in the fourth and tenth subcarriers from the bottom of the first OFDM symbol pair is defined as a reference signal resource element pair corresponding to the second antenna port. And the resource element pairs in the first and seventh subcarriers from the bottom of the third OFDM symbol pair are set as reference signal resource element pairs corresponding to the second antenna port, and the fourth OFDM symbol pair 4th and 10th from the bottom Are set as reference signal resource element pairs corresponding to the second antenna port, and the resource element pairs in the first and seventh subcarriers from the bottom of the sixth OFDM symbol pair are Reference signal resources corresponding to the third antenna port are set as reference signal resource element pairs corresponding to the second antenna port, and resource element pairs in the first and seventh subcarriers from the bottom of the second OFDM symbol pair. Set as an element pair, set resource element pairs in the first and seventh subcarriers from the bottom of the fifth OFDM symbol pair as reference signal resource element pairs corresponding to the third antenna port, and set the second OFDM 4th from the bottom of the symbol pair and A resource element pair in the 0th subcarrier is set as a reference signal resource element pair corresponding to the fourth antenna port, and a resource element pair in the fourth and 10th subcarriers from the bottom of the fifth OFDM symbol pair is set. , And setting as a reference signal resource element pair corresponding to the fourth antenna port.

  In one embodiment of the present invention, the other transmission target data includes a reference signal other than the first setting reference signal among the cell reference signal, a demodulation reference signal, and a channel state information reference signal, a physical layer control channel resource , An instruction channel resource, a physical layer broadcast channel resource, and a synchronization signal resource.

  In one embodiment of the present invention, before partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe, among users who receive each resource block in the time-frequency resource of the current subframe, If there is a user who satisfies the channel quality and the receiving side satisfying the predetermined condition, and there is a user who satisfies the channel quality and the receiving side, at least one OFDM symbol from the time frequency resource of the current subframe The resource elements other than the reference signal resource element pair and the data resource element pair further include channel quality and all resource resources in a resource block to be received by a user whose receiving side does not satisfy a predetermined condition. Including the instrument.

  A data transmission apparatus according to the present invention, wherein at least one orthogonal frequency division multiplexing (OFDM) symbol pair is partitioned from time frequency resources of a current subframe, and each OFDM symbol pair is adjacent in time by two An OFDM symbol is included, OFDM symbols in different OFDM symbol pairs do not overlap, and two resource elements (RE) adjacent to each other in the same subcarrier in the same OFDM symbol pair constitute one resource element pair, and at least 1 A time-frequency resource partitioning means for setting one resource element pair as a reference signal resource element pair and setting at least one resource element pair as a data resource element pair among other resource element pairs other than the reference signal resource element pair; In the reference signal resource element pair, the first setting reference signal is mapped in a manner that the data in the two resource elements is the same, and in the data resource element pair, one or two data symbols are mapped, and the data When mapping one data symbol in a resource element pair, when mapping the data symbol in a manner that makes data in two resource elements the same, and mapping two data symbols in the data resource element pair, The two data symbols are mapped to two resource elements, respectively, and other transmission target data is transmitted in other resource elements other than the reference signal resource element pair and the data resource element pair. A data mapping means for mapping the signal and a transmission signal corresponding to the OFDM symbol, and a transmission signal corresponding to the generated OFDM symbol is configured as a transmission frame, where a transmission signal corresponding to the OFDM symbol is generated The reference signal resource element pair and the data resource element pair in each OFDM symbol pair to the first resource element before the first resource element in the reference signal resource element pair and the data resource element pair. A first cyclic guard period that duplicates the signal at the end of the corresponding time domain signal is added, and after the second resource element in the reference signal resource element pair and the data resource element pair, the second resource element Transmission frame generating means for adding a second circulation guard period obtained by duplicating the signal of the head portion of the time domain signal corresponding to, and data transmitting means for transmitting the generated transmission frame.

  In an embodiment of the present invention, the transmission frame generation means further generates a transmission signal corresponding to the OFDM symbol before other resource elements other than the reference signal resource element pair and the data resource element pair. A first circulation guard period is added.

  In one embodiment of the present invention, the transmission frame generation means adds a first cyclic guard period before the first OFDM symbol for each OFDM symbol pair, and Forming a transmission signal of the OFDM symbol, adding a second cyclic guard period after the second OFDM symbol to form a transmission signal of the second OFDM symbol of the OFDM symbol pair, and the data mapping means comprises: In other resource elements other than the reference signal resource element pair and the data resource element pair, before mapping other transmission target data, the first other one that tries to map to the second resource element in the OFDM symbol pair By compensating the phase for the transmission target data of When generating a transmission signal corresponding to the symbol, prior to the first addition to the transmission target data, thereby adding the first circulation guard period.

  In one embodiment of the present invention, the transmission frame generation means performs a first cycle in which a signal at the end of the first OFDM symbol is copied before the first OFDM symbol for each OFDM symbol pair. A guard period is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and the second OFDM symbol of the OFDM symbol pair is changed to 2 in all reference signal resource element pairs and data resource element pairs. The first part OFDM symbol padded with zeros at positions corresponding to the other resource elements and the other resource elements, and 2 in the reference signal resource element pair and the data resource element pair. Pad with zeros at the position corresponding to the th resource element The second part OFDM symbol is processed in two parts, the second part OFDM symbol is added after the first part OFDM symbol, and the second part OFDM symbol is added before the second part OFDM symbol. , Adding the first cyclic guard period, and then adding the two portions of OFDM symbols to form the transmission signal of the second OFDM symbol of the OFDM symbol pair.

  In one embodiment of the present invention, the time frequency resource allocating means includes a physical layer control channel resource, an instruction channel resource, a physical layer broadcast channel resource, a synchronization signal resource, a cell reference signal resource, a demodulation reference signal resource, a channel in a frame structure. Based on the position of any one of the state information reference signal resources or any combination, the partitioned OFDM symbol pair is any one of the physical layer control channel, the indication channel, and the physical layer broadcast channel. Does not affect information transmission of one or any combination and / or affects transmission of any one or any combination of synchronization signal, cell reference signal, demodulation reference signal, channel state information reference signal In order not to give Partitioning the Kutomo one OFDM symbol pair.

  In one embodiment of the present invention, the time-frequency resource partitioning unit sets at least one resource element pair in each subcarrier of a predetermined resource block as a reference signal resource element pair, or the time-frequency resource partitioning unit Is any one or any of a physical layer control channel resource, an instruction channel resource, a physical layer broadcast channel resource, a synchronization signal resource, a cell reference signal resource, a demodulation reference signal resource, and a channel state information reference signal resource in a frame structure Based on the position of the resource element in which the combination is located, an available resource element pair is set in the OFDM symbol pair divided from the predetermined resource block, and the use of the predetermined resource block in one subcarrier is set. If possible resource element pairs is two or more pairs, at least one of the available resource elements pairs in the sub-carrier, it sets as a reference signal resource elements pairs.

  In one embodiment of the present invention, the first setting reference signal includes at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal, and the time-frequency resource partitioning means includes an OFDM symbol Principle of making the position of the pair close to the position of the OFDM symbol used by the first setting reference signal in LTE and matching the number of OFDM symbol pairs with the number of OFDM symbols used by the first setting reference signal in LTE To partition at least one OFDM symbol pair from the time-frequency resource of the current subframe, close the position of the reference signal resource element pair to the position of the resource element used by the first configured reference signal in LTE, and The number of reference signal resource element pairs is the first setting reference signal in LTE According to the principles to match the number of resource elements used is set as the reference signal resource elements-to at least one resource element pairs.

  In an embodiment of the present invention, the apparatus determines whether there is a user who satisfies a predetermined condition for channel quality and a receiving side among users receiving each resource block in a time-frequency resource of a current subframe. And a time frequency resource partitioning unit that partitions at least one OFDM symbol pair from the time frequency resource of the current subframe when there is a user who satisfies channel quality and a predetermined condition on the receiving side. The other resource elements other than the reference signal resource element pair and the data resource element pair include all resource elements in the reception target resource block of the user whose channel quality and the reception side do not satisfy the predetermined condition.

  In the present invention, the OFDM symbol pair, the reference signal resource element pair, and the data resource element pair are separated from the time frequency resource of the current subframe, and the same reference signal data is transmitted by the reference signal resource element pair. When transmitting the same data and generating a transmission frame, a first cyclic guard period is added before the first resource element of the resource element pair, and the second resource element of the resource element pair is added. By adding a second cyclic guard period after the reference signal resource element pair and data resource element pair in phase, thereby equivalently forming an OFDM symbol with a longer cyclic prefix (CP) To do. In this way, if the radio channel delay extension is large, it can resist intersymbol interference, which better protects the data in the reference signal and data resource element pair.

  Here, the reference signal transmitted by the reference signal resource element pair may be various existing reference signals, or may be a newly added reference signal. When it is a newly added reference signal, in the present invention, in the frame structure, physical layer control channel resource, indication channel resource, physical layer broadcast channel resource, synchronization signal resource, cell reference signal resource, demodulation reference signal resource, channel state in the frame structure By dividing the OFDM symbol pair from the time frequency resource of the current subframe based on the position of the special channel and signal such as information reference signal resource, the partitioned OFDM symbol pair becomes the special channel and special signal. Is not affected, thereby obtaining maximum compatibility with conventional LTE standards.

  Also, the division into OFDM symbol pairs and reference signal resource element pairs can be in units of resource blocks, i.e., for receivers with poor channel conditions and supporting PS-OFDM technology, the resource blocks are: For receivers that can be processed using PS-OFDM technology and have good channel conditions or receivers that have poor channel conditions but do not support PS-OFDM technology, the resource block still adopts the conventional LTE standard Can be processed. In this case, when performing data mapping in the present invention, a transmission frame is generated by compensating the phase of data to be mapped to the second OFDM symbol of the OFDM symbol pair in advance in this part of the resource block. In this case, it is only necessary to make the phase coincide with the phase when processing is performed using the conventional LTE standard without adopting the PS-OFDM technology. Alternatively, the second OFDM symbol in the OFDM symbol pair in the resource block processed using the PS-OFDM technology and the resource block processed using the conventional LTE standard is replaced with the second cyclic guard period after the OFDM symbol. And a part to which the first cyclic guard period is added before the OFDM symbol, and then the two parts of the OFDM symbols are added to obtain 2 of the OFDM symbol pair. The transmission signal of the second OFDM symbol is formed. In this way, the application of the solution of the present invention can be made more flexible while being compatible with conventional receivers.

  Also, for example, if sensitive data having a special request such as a channel state information reference signal is to be mapped to the second OFDM symbol of the OFDM symbol pair, the phase is changed when mapping. Compensation is also possible, whereby when a transmission frame is generated, its phase is matched with the phase when processing is performed using the conventional LTE standard without using the PS-OFDM technology. Or it is the part of the OFDM symbol that adds the first cyclic guard period before the OFDM symbol. In this way, it is possible to ensure that these sensitive data are not affected while also protecting the reference signal.

It is an exemplary block diagram of the data transmission method in the Example of this invention. It is the schematic of the division of the time-frequency resource of a resource block in case the 1st setting reference signal in Example 1 of this invention is a cell reference signal. It is the schematic of the division of the time frequency resource of the typical downlink sub-frame resource block in the example 2 of this invention. It is the schematic of the division of the time frequency resource of the resource block containing the broadcast channel in example 2 of this invention. It is the schematic of the other division of the time frequency resource of the resource block containing the broadcast channel in example 2 of this invention. It is the schematic of the division of the time frequency resource of the resource block containing the sub-synchronization signal in example 2 of this invention. It is the schematic of the division of the time frequency resource of the resource block containing the main synchronizing signal in the special sub-frame in the example 2 of this invention. It is the schematic of the division of the time frequency resource of the resource block which does not contain the main synchronization signal in the special sub-frame in Example 2 of this invention. It is an exemplary block diagram of a data transmission apparatus in an embodiment of the present invention.

  FIG. 1 is an exemplary configuration diagram of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps.

  In step 101, at least one orthogonal frequency division multiplexing (OFDM) symbol pair is partitioned from the time frequency resources of the current subframe, and each OFDM symbol pair includes two OFDM symbols that are adjacent in time, and are different from each other. Two resource elements (RE) adjacent to each other in the same subcarrier in the same OFDM symbol pair constitute one resource element pair, and the OFDM symbol in the symbol pair does not overlap, and at least one resource element pair is A reference signal resource element pair is set, and at least one resource element pair other than the reference signal resource element pair is set as a data resource element pair.

  In this step, two resource elements in each reference signal resource element pair are used for transmission of the same reference signal data.

  In step 102, in the reference signal resource element pair, a first setting reference signal is mapped in a manner that makes data in two resource elements the same, and one or two data symbols are mapped in the data resource element pair. When mapping and mapping one data symbol in the data resource element pair, the data symbol is mapped in a manner in which the data in the two resource elements is the same, and two data symbols in the data resource element pair. Are mapped to the two resource elements, respectively.

  Here, the first setting reference signal may be an existing reference signal in the prior art or may be a newly added reference signal.

  In this embodiment, the first setting reference signal is generated by an arbitrary sequence generator and mapped to a reference signal resource element pair.

  For example, the first setting reference signal can be generated based on a Gold code sequence generator. Assuming that the sequence of the first setting reference signal is r (m), it can be generated according to the rule shown in Equation 1 below.

  After the sequence is generated, the first element r (0) of r (m) can be mapped to the first reference signal resource element pair, i.e. the two resources in the first reference signal resource element pair. Each element transmits r (0), maps r (1) to the second reference signal resource element pair, and analogizes in this way.

  Here, data of each channel of the physical layer can be mapped in the data resource element. The number of data symbols mapped to each data resource element pair (1 or 2) can be notified to the receiving side by a method such as a downlink control channel or a broadcast signal. Of course, if there is a promise in advance between the sending side and the receiving side, it can be mapped according to the promise.

  In step 103, other transmission target data is mapped in other resource elements other than the reference signal resource element pair and the data resource element pair.

  In this step, the other transmission target data may include other reference signals, special signals, other data of each channel of the physical layer not mapped to the data resource element pair, and the like.

  Here, with respect to other resource element pairs other than the reference signal resource element pair and the data resource element pair, one transmission signal may be mapped to each resource element pair, or two transmission signals may be mapped. . When one transmission signal is mapped to a resource element pair, a similar signal is transmitted by two resource elements, and when two transmission signals are mapped to a resource element pair, two different transmission signals are transmitted by two resource elements. Is transmitted. The number of signals (1 or 2) mapped to each data resource element pair can be notified to the receiving side using a downlink control channel, a broadcast signal, or the like. Of course, if there is a promise in advance between the sending side and the receiving side, it can be mapped according to the promise.

  In step 104, a time-domain OFDM symbol is generated using an inverse Fourier (IFFT) transform on the OFDM symbol to which data is mapped.

  In step 105, when generating a transmission signal corresponding to the OFDM symbol, the reference signal resource element pair and the data resource element pair in the OFDM symbol pair are processed using the PS-OFDM method. That is, a first cyclic guard period is added before the first resource element in the reference signal resource element pair and the data resource element pair, and the second resource element in the reference signal resource element pair and the data resource element pair A second circulation guard period is added later.

  In this embodiment, it may be considered that a resource element carrying a certain type of sensitive data is made compatible with a conventional standard, or more or less a reference signal resource element pair and data. For other resource elements other than the resource element pair, it may be considered to make any of them compatible with the conventional standard. In this case, a first cyclic guard period (ie, cyclic prefix) can still be added before the resource element.

  Here, other resource elements other than the reference signal resource element pair and the data resource element pair are classified as OFDM symbol pairs from other resource elements other than the reference signal resource element pair and the data resource element pair in the OFDM symbol pair. Resource elements in non-OFDM symbols.

  In this embodiment, the first circulation guard period is a duplicate of the signal at the end of the time domain signal corresponding to the first resource element, and the second circulation guard period is the second resource guard period. It is a duplicate of the signal at the beginning of the time domain signal corresponding to the element.

  In step 106, a transmission signal corresponding to the generated OFDM symbol is configured as a transmission frame, and the transmission frame is transmitted.

  In this step, the transmission frame can be transmitted via the RF circuit.

  In the present embodiment, when generating a transmission signal corresponding to an OFDM symbol in Step 105, for each resource element in an OFDM symbol that is not partitioned as an OFDM symbol pair, a first cyclic guard period is provided before each resource element. The specific implementation method of adding may be consistent with the prior art method.

  When generating a transmission signal corresponding to the OFDM symbol in Step 105, the first resource of the reference signal resource element pair and the data resource element pair is compared with the reference signal resource element pair and the data resource element pair in the OFDM symbol pair. A first cyclic guard period is added before the element, a second cyclic guard period is added after the second resource element in the reference signal resource element pair and the data resource element pair, and the reference signal in the OFDM symbol pair There are several specific implementation methods for adding the first cyclic guard period before each resource element to other resource elements other than the resource element pair and the data resource element pair. The raise.

  First, phase compensation method.

  Before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair, the phase with respect to the transmission target data to be mapped to the second resource element in the OFDM symbol pair When a transmission signal corresponding to an OFDM symbol is generated, a first cyclic guard period is added before the transmission target data.

  Thereafter, when generating a transmission signal corresponding to the OFDM symbol, for each OFDM symbol pair, a first cyclic guard in which the signal at the end of the first OFDM symbol is copied before the first OFDM symbol. A second cyclic guard is formed by adding a period to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and duplicating the signal of the head portion of the second OFDM symbol after the second OFDM symbol. By adding a period, a transmission signal of the second OFDM symbol of the OFDM symbol pair is formed.

  Here, a specific phase compensation method may be as follows.

  Phase compensation with the length of the inverse Fourier transform (IFFT) used by the system in step 105 as N sampling points and the length of the second cyclic guard period as M sampling points (usually M <N) Is the resource element that needs to be performed at the position of the subcarrier of IFFT number k (0 ≦ k <N), and d is the data that needs to be mapped to the resource element, and the compensation is actually mapped to the resource element Assuming that the subsequent data is c, Equation 2 is obtained.

  Part 2, grouping processing method.

  For each OFDM symbol pair, a first cyclic guard period obtained by duplicating the signal at the end of the first OFDM symbol is added before the first OFDM symbol, and the first OFDM symbol of the OFDM symbol pair is added. Forming a transmission signal of symbols, the second OFDM symbol of the OFDM symbol pair including second resource elements in all reference signal resource element pairs and data resource element pairs, and the reference signal resource element pair and the data resource A first part of the OFDM symbol padded with zeros at positions corresponding to other resource elements other than the second resource element in the element pair, and other than the second resource element in the reference signal resource element pair and the data resource element pair Other A source element is included and processed in two parts with a second part OFDM symbol padded with zeros at positions corresponding to the second resource element in the reference signal resource element pair and the data resource element pair, The second cyclic guard period is added after the first part OFDM symbol, the first cyclic guard period is added before the second part OFDM symbol, and then the two parts OFDM The symbols are added to form a transmission signal of the second OFDM symbol of the OFDM symbol pair.

  The above describes a specific implementation method for adding a first cyclic guard period before each resource element to resource elements other than the reference signal resource element pair and the data resource element pair in the OFDM symbol pair. did. In a practical application, a first cyclic guard is placed before each resource element only for resource elements carrying specific types of sensitive data other than the reference signal resource element pair and the data resource element pair in the OFDM symbol pair. A period may be added. The specific implementation method of such a situation may be similar to the two specific implementation methods listed above.

  For example, in the first type method, before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair, let's map to the second resource element in the OFDM symbol pair. When a transmission signal corresponding to an OFDM symbol is generated by compensating the phase for the specific type of sensitive data, a first cyclic guard period is added before the specific type of sensitive data. Let Thereafter, when generating a transmission signal corresponding to the OFDM symbol, a first cyclic guard period is added before the first OFDM symbol for each OFDM symbol, and the first OFDM of the OFDM symbol pair is added. A symbol transmission signal is formed, and a second cyclic guard period is added after the second OFDM symbol to form the second OFDM symbol transmission signal of the OFDM symbol pair.

  Further, for example, in the second type method, for each OFDM symbol pair, a first cyclic guard period in which a signal at the end of the first OFDM symbol is copied is added before the first OFDM symbol. The first OFDM symbol transmission signal of the OFDM symbol pair, and the second OFDM symbol of the OFDM symbol pair includes all resource elements other than resource elements carrying specific types of sensitive data The first part of the OFDM symbol padded with zeros at the position of the resource element carrying the specific type of sensitive data and the resource element carrying the specific type of sensitive data. Padded with zeros at positions corresponding to all resource elements except for the resource element The second part OFDM symbol is processed in two parts, the second part guard symbol is added after the first part OFDM symbol, and the second part OFDM symbol is added before the second part OFDM symbol. And adding the first cyclic guard period, and then adding two portions of OFDM symbols to form a transmission signal of the second OFDM symbol of the OFDM symbol pair.

  Here, when the first setting reference signal is an existing reference signal in LTE, for example, the first setting reference signal includes at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal. In this case, the specific type of sensitive data includes a reference signal other than the first setting reference signal among the cell reference signal, a demodulation reference signal, and a channel state information reference signal, a physical layer control channel resource, and an indication channel. At least one of a resource, a physical layer broadcast channel resource, and a synchronization signal resource may be included.

  When the first setting reference signal is a newly added reference signal, the specific type of sensitive data includes a cell reference signal, a channel state information reference signal, and data demodulated using the cell reference signal. At least one of them may be included.

  Specifically, when the OFDM symbol pair is divided in the embodiment of the present invention, it can be performed in units of resource blocks. Each resource block in the current subframe includes 14 OFDM symbols continuous in time and 12 subcarriers continuous in frequency. Before partitioning an OFDM symbol pair, it can first be determined whether the resource block is protected using PS-OFDM technology. For example, using PS-OFDM technology, such as whether the channel quality (i.e. the channel condition between the transmitter and its receiving user's receiver) is bad, whether the receiver supports PS-OFDM technology, etc. The channel quality corresponding to the resource block that needs to be protected and the condition that the receiving side should satisfy can be set in advance. If the channel conditions between the transmitter and its receiving user's receiver are ideal, this resource block can be generated entirely using the conventional LTE standard and requires protection of PS-OFDM technology. do not do. If the channel conditions between the transmitter and the receiving user's receiver are poor and the receiver supports PS-OFDM technology, this resource block can use PS-OFDM technology protection. Whether the resource block uses PS-OFDM technology or not can be notified to the receiving side by means of a downlink broadcast channel, a control channel, or the like.

  When there is a resource block that needs to use PS-OFDM technology in the time-frequency resource of the current subframe, that is, among the users receiving each resource block in the time-frequency resource of the current subframe, channel quality and reception When there is a user who satisfies a predetermined condition on the side, the OFDM symbol pair can be distinguished from the time-frequency resource of the current subframe, and it is necessary to protect using the PS-OFDM technology when specifically dividing Sort based on resource block.

  In this case, for the data to be mapped to the second symbol in the OFDM symbol pair in the resource block that does not need to be protected using PS-OFDM technology in the current subframe, these data are referred to as the reference signal resource element pair and the data. It may be processed as other resource elements other than a resource element pair, or may be processed as a specific type of sensitive data, i.e., when mapping data, first the phase is traditionally compared to it. The phase is compensated according to Equation 2 so as to match the phase when mapping in the LTE standard, or it is processed as the second partial data of the second OFDM symbol in the OFDM symbol pair.

  In an embodiment of the present invention, there may be different OFDM symbol pairs and different partitioning methods for reference signal resource element pairs and data resource element pairs in step 101 based on different types of first set reference signals to be mapped. is there. Hereinafter, the case where the first setting reference signal is an existing reference signal and the case where the first setting reference signal is a newly added reference signal will be described using two examples.

(Example 1: When the first setting reference signal is an existing reference signal)
For example, the first setting reference signal is a reference signal defined in an existing LTE standard such as a cell reference signal (CRS), a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), or the like. If there is, in step 101, the division of the OFDM symbol pair is determined by using the position of the OFDM symbol pair as the position of the OFDM symbol used by the first setting reference signal in the existing LTE standard (the first setting reference signal is used in LTE). And the number of OFDM symbol pairs can be made to coincide with the number of OFDM symbols used by the first set reference signal in the existing LTE standard. After being protected in this way, the number of OFDM symbols actually used by the first configuration reference signal is double the number of OFDM symbols it uses in the existing LTE standard. Correspondingly, when setting the reference signal resource element pair, the reference signal resource element pair is positioned close to the position of the resource element used by the first setting reference signal in the existing LTE standard. The number of pairs can be matched to the number of resource elements used by the first configuration reference signal in the existing LTE standard. After being protected, the number of resource elements that the first configuration reference signal actually uses is double the number of resource elements that it uses in the existing LTE standard.

  FIG. 2 is a diagram illustrating a method of dividing an OFDM symbol pair and a reference signal resource element pair when the first setting reference signal is a cell reference signal. FIG. 2 shows the same transmission time-frequency resource block of four antenna ports of the LTE system, and in this paper, all OFDM symbols are set as abscissas and subcarriers are set as ordinates. Here, the OFDM symbols on the abscissa are arranged from left to right in the order of the OFDM symbol transmission time, and the subcarriers on the ordinate are arranged in descending order of the subcarrier frequency. As can be seen from this, this resource block is composed of 14 OFDM symbols, and each OFDM symbol includes 12 subcarriers. First, as shown in FIG. The block divides six OFDM symbol pairs, that is, the first and second OFDM symbols from the left as the first OFDM symbol pair, and the third and fourth OFDM symbols as the second OFDM symbol pair, The fifth and sixth OFDM symbols are used as a third OFDM symbol pair, the eighth and ninth OFDM symbols are used as a fourth OFDM symbol pair, and the tenth and eleventh OFDM symbols are used as a fifth OFDM symbol pair. , The 12th and 13th OFDM symbols to the 6th OFDM symbol It is classified as Le pairs.

  Thereafter, in the OFDM symbol pair, a cell reference signal resource element pair is set at a position where R0, R1, R2, and R3 as shown in FIG. 2 are marked. That is, when antenna port 0 is supported in this time-frequency resource block, the resource element pairs in the first and seventh subcarriers from the bottom of the first OFDM symbol pair are set as cell reference signal resource element pairs, The resource element pairs in the 4th and 10th subcarriers from the bottom of the 3 OFDM symbol pairs are set as cell reference signal resource element pairs, and in the 1st and 7th subcarriers from the bottom of the 4th OFDM symbol pair Resource element pairs are set as cell reference signal resource element pairs, and resource element pairs in the fourth and tenth subcarriers from the bottom of the sixth OFDM symbol pair are set as cell reference signal resource element pairs. When antenna port 1 is supported in this time-frequency resource block, resource element pairs in the fourth and tenth subcarriers from the bottom of the first OFDM symbol pair are set as cell reference signal resource element pairs, Resource element pairs in the first and seventh subcarriers from the bottom of the OFDM symbol pair are set as cell reference signal resource element pairs, and resource elements in the fourth and tenth subcarriers from the bottom of the fourth OFDM symbol pair The pair is set as a cell reference signal resource element pair, and the resource element pairs in the first and seventh subcarriers from the bottom of the sixth OFDM symbol pair are set as cell reference signal resource element pairs. When antenna port 2 is supported in this time-frequency resource block, resource element pairs in the first and seventh subcarriers from the bottom of the second OFDM symbol pair are set as cell reference signal resource element pairs, Resource element pairs in the first and seventh subcarriers from the bottom of the OFDM symbol pair are set as cell reference signal resource element pairs. When antenna port 3 is supported in this time-frequency resource block, resource element pairs in the fourth and tenth subcarriers from the bottom of the second OFDM symbol pair are set as cell reference signal resource element pairs, Resource element pairs in the fourth and tenth subcarriers from the bottom of the OFDM symbol pair are set as cell reference signal resource element pairs.

  Thereafter, a data resource element is set at an unfilled position as shown in FIG. 2 in the OFDM symbol pair. That is, in the time-frequency resource block corresponding to each antenna port, the second, third, fifth, sixth, eighth, from the bottom of the second, third, fourth, fifth and sixth OFDM symbol pairs, Resource element pairs in the ninth, eleventh, and twelfth subcarriers are set as data resource elements.

  The cell reference signals mapped to the two resource elements in each cell reference signal resource element pair are the same, thereby constituting a complete cell reference signal protected. The data transmitted on the physical layer control channel (PDCCH) in each resource block is sensitive data, and the data to be mapped to the second OFDM symbol in the OFDM symbol pair compensates the phase before IFFT, Alternatively, it is necessary to use the data of the second part of the second OFDM symbol in the OFDM symbol pair.

  In the time frequency resource shown in FIG. 2, a resource element marked with C represents a resource element that maps data of a physical layer control channel. The grid portion represents an empty resource element, i.e., a reserve resource.

(Example 2: When the first setting reference signal is a newly added reference signal)
In addition, for example, the first setting reference signal to be mapped is a newly added reference signal for demodulating data to be processed using the PS-OFDM technology, where a phase synchronization reference signal (PSRS) and I write. In such a case, if the compatibility with the OFDM technology standard in the conventional LTE standard is kept as much as possible, a specific implementation method in the above step 101 may be as follows.

  When distinguishing the OFDM symbol pair and the reference signal resource element pair from the time frequency resource of the current subframe, a physical layer control channel (PDCCH), a physical layer hybrid automatic repeat request (ARQ) indication channel (PHICH) in the frame structure, Physical layer control channel format indication channel (PCFICH), broadcast channel (PBCH), cell reference signal (CRS), channel state information reference signal (CSI-RS), main synchronization signal (PSS), sub-synchronization signal (SSS), uplink It is possible to ensure that some or all positions in the downlink switching guard period (GP) and the uplink pilot transmission time slot match the standard in the conventional LTE.

  Accordingly, the physical layer control channel resource, the instruction channel resource, the physical layer broadcast channel resource, the synchronization signal resource, and the second setting reference signal (for example, the cell reference signal, the demodulation reference signal resource, and the channel state information reference) in the frame structure. Based on the location of any one or any combination of (signal) resources, the segmented OFDM symbol pair may be any one or any combination of a control channel, an indication channel, and a physical layer broadcast channel. At least one OFDM symbol pair from the time-frequency resource of the current subframe so that the information transmission of the current subframe is not affected and / or the transmission of the synchronization signal and / or the second configuration reference signal is not affected. Can be classified.

  In this example, the division of OFDM symbol pairs can be performed in units of resource blocks. Each resource block in the current subframe includes 14 OFDM symbols continuous in time and 12 subcarriers continuous in frequency. An OFDM symbol pair can be partitioned according to the following method.

  1) Determine whether this resource block is protected using PS-OFDM technology. For example, using PS-OFDM technology, such as whether the channel quality (i.e. the channel condition between the transmitter and its receiving user's receiver) is bad, whether the receiver supports PS-OFDM technology, etc. The channel quality corresponding to the resource block that needs to be protected and the condition to be satisfied by the receiving side can be set in advance. If the channel conditions between the transmitter and its receiving user's receiver are ideal, the resource block can be generated entirely using the conventional LTE standard and requires protection of PS-OFDM technology. do not do. If the channel conditions between the transmitter and the receiving user's receiver are poor and the receiver supports PS-OFDM technology, this resource block can use PS-OFDM technology protection. Whether the resource block uses PS-OFDM technology or not can be notified to the receiving side by means of a downlink broadcast channel, a control channel, or the like.

  When there is a resource block that needs to use PS-OFDM technology in the time-frequency resource of the current subframe, that is, among the users receiving each resource block in the time-frequency resource of the current subframe, channel quality and reception When there is a user who satisfies a predetermined condition on the side, the OFDM symbol pair can be distinguished from the time-frequency resource of the current subframe, and it is necessary to protect using the PS-OFDM technology when specifically dividing Sort based on resource block.

  Of course, in practical applications, it may be the default to protect all resource blocks of the current subframe using PS-OFDM technology. In this case, step 1) above may be omitted.

  2) Physical layer control channel, instruction channel, broadcast channel, cell reference signal, channel state information reference signal, main synchronization signal, sub synchronization signal, uplink switching guard period, uplink pilot transmission time slot in the current resource block, and Determine whether there are special channels and signals, such as spare resources, and the locations that the signals and channels use.

  3) Partition OFDM symbol pairs. The classification rules may be as follows: (A) In the conventional LTE standard, when all OFDM symbols are used by the special channel or signal in step 2), this OFDM symbol does not constitute an OFDM symbol pair with its neighboring OFDM symbol. (B) In the conventional LTE standard, when there is a used resource in an OFDM symbol, an OFDM symbol pair that should consider whether there is a used resource in the same subcarrier in the adjacent OFDM symbol When partitioning, it should be ensured as much as possible that resource element pairs in the OFDM symbol pairs are used simultaneously. (C) When the OFDM symbol pair of one resource block is partitioned, the OFDM symbol pair of all resource blocks (if it participates in the partition) in the same subframe (subframe consisting of 14 OFDM symbols) Classification methods should be consistent. When the positions of special signals in different resource blocks in the same subframe are not the same, the above two rules (a) and (b) should be established for all resource blocks when partitioning OFDM symbol pairs. .

  Taking one resource block in the typical LTE downlink subframe of FIG. 3 as an example, the first and second symbols of this resource block are used by a downlink control channel such as PDCCH and are not distinguished as symbol pairs. Considering the cell reference signal, the channel state information reference signal, and the request for the spare empty resource element at the same time, the third and fourth, sixth and seventh, eighth and ninth, tenth and eleventh, thirteenth and The 14th OFDM symbol is partitioned as an OFDM symbol pair. Specifically, the third and fourth OFDM symbols are used as the first OFDM symbol pair, the sixth and seventh OFDM symbols are used as the second OFDM symbol pair, and the eighth and ninth OFDM symbols are used as the third OFDM symbol. As the OFDM symbol pair, the 10th and 11th OFDM symbols can be partitioned as a fourth OFDM symbol pair, and the 13th and 14th OFDM symbols can be partitioned as a fifth OFDM symbol pair.

  For the resource block including the physical layer broadcast channel (PBCH), in order to consider that there are many resources used by the broadcast channel and the remaining resources are small, it is not considered to distinguish the OFDM symbol pair from this resource block. Alternatively, the frame structure in the LTE standard as shown in FIG. 4 can be continuously used. Alternatively, according to the above principle, it can be divided into the configuration shown in FIG. 5, i.e., considering the physical layer control channel, cell reference signal, channel state information reference signal, and the requirement of spare empty resource elements simultaneously. The fourth and sixth, sixth and seventh, twelfth and thirteenth OFDM symbols are partitioned as OFDM symbol pairs, respectively. Specifically, the third and fourth OFDM symbols are used as the first OFDM symbol pair, the sixth and seventh OFDM symbols are used as the second OFDM symbol pair, and the 12th and 13th OFDM symbols are used as the third OFDM symbol pair. It can be partitioned as an OFDM symbol pair.

  The resource block including the sub-synchronization signal (SSS) can be classified according to the example shown in FIG. Considering the physical layer control channel, cell reference signal, channel state information reference signal, and spare empty resource element requirements simultaneously, the third and fourth, sixth and seventh, eighth and ninth, tenth and eleventh The th, twelfth and thirteenth OFDM symbols are partitioned as OFDM symbol pairs, respectively. Specifically, the third and fourth OFDM symbols are used as the first OFDM symbol pair, the sixth and seventh OFDM symbols are used as the second OFDM symbol pair, and the eighth and ninth OFDM symbols are used as the third OFDM symbol. As the OFDM symbol pair, the 10th and 11th OFDM symbols can be partitioned as a fourth OFDM symbol pair, and the 12th and 13th OFDM symbols can be partitioned as a fifth OFDM symbol pair. Since it is necessary to maintain the matching of the partitioning methods for other resource blocks in which the SSS is not included in the same subframe, it is also necessary to partition according to the method shown in FIG. In these resource blocks, the last OFDM symbol of the resource block does not contain SSS, but it cannot still be partitioned as an OFDM symbol pair and needs to be partitioned as shown in FIG.

  For special subframes of time division duplex LTE, that is, three special time slots of downlink pilot transmission time slot (DwPTS), uplink / downlink switching guard period (GP), and uplink pilot transmission time slot (UpPTS). For subframes to be included, FIG. 7 and FIG. 8 respectively show the division status when the main synchronization signal is included in the resource block and when the main synchronization signal is not included. The section shown in the figure is an example of the situation of the arrangement 4 of the special subframe. The arrangement of special subframes in other LTE standards can still be classified according to the above principle.

  FIG. 7 shows a partitioning situation when the main synchronization signal is included, and considering the physical layer control channel, the cell reference signal, the channel state information reference signal, and the request for the spare empty resource element at the same time, the fourth and fifth The 10th and 11th OFDM symbols as the first OFDM symbol pair, the 6th and 7th OFDM symbols as the 2nd OFDM symbol pair, and the 8th and 9th OFDM symbols as the 3rd OFDM symbol pair, respectively. The th OFDM symbol is partitioned as a fourth OFDM symbol pair.

  FIG. 8 shows a partitioning situation when the main synchronization signal is not included, and the resource block shown in FIG. 8 is located in the same subframe as the resource block shown in FIG. 7 and also need to be partitioned according to the method shown in FIG. 7, that is, similarly, the fourth and fifth OFDM symbols are the first OFDM symbol pair, and the sixth and seventh OFDM symbols are the second OFDM symbols. As the symbol pair, the 8th and 9th OFDM symbols are partitioned as a third OFDM symbol pair, and the 10th and 11th OFDM symbols are partitioned as a 4th OFDM symbol pair. As can be seen from these figures, in these resource blocks, the third OFDM symbol of the resource block does not contain the main synchronization signal, but it still cannot be partitioned as an OFDM symbol pair, as shown in FIG. There is a need to.

  4) At least one resource element pair in each subcarrier in a predetermined resource block is set as a reference signal resource element pair.

  Alternatively, based on the usage status of the special channel or signal in the resource element in step 2), first, the resource element pair that can be used in the partitioned OFDM symbol pair is set, and the resource element pair that can be used is set. The principle may be as follows. (A) If one of the two resource elements adjacent on the same subcarrier in the OFDM symbol pair is already used by the special channel or signal in step 2), the other resource element is used with it Do not configure possible resource element pairs. (B) If two resource elements are both used by the special channel or signal in step 2), do not constitute an available resource element pair. (C) When only one resource element pair that is not used in the same subcarrier remains, this resource element pair does not constitute an available resource element pair. (D) If only two or three resource element pairs that are not used on the same subcarrier remain, a compromise can be made based on the efficiency and reliability of the system, and either of them can be used Partition as a pair or do not partition as an available resource element pair.

  Here, data in resource elements that do not constitute a usable resource element pair is demodulated using a cell reference signal.

  A reference signal PSRS resource element pair for demodulation of PS-OFDM symbols is set from the segmented usable resource element pairs. The setting rule of the reference signal PSRS resource element pair may be as follows. (A) When each subcarrier includes more than one usable resource element pair, at least one PSRS resource element pair (in this embodiment, one is set as an example) Can be set. (B) When there is no collision with the position of a used resource, PSRS resource element pairs in adjacent subcarriers can be spaced as long as possible in the time domain. 3 to 8 show setting examples of PSRS resource element pairs in each case in this example.

  In FIG. 3, the resource element pairs in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs. Resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the five OFDM symbol pairs are set as reference signal resource element pairs.

  In FIG. 5, resource element pairs in the third, sixth, ninth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs, and the third OFDM symbol pair Resource element pairs in the second, fifth, eighth, and eleventh subcarriers from the bottom are set as reference signal resource element pairs.

  In FIG. 6, the resource element pairs in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs. Resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the four OFDM symbol pairs are set as reference signal resource element pairs.

  In FIG. 7, the resource element pairs in the second, sixth, eighth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs, and the fourth OFDM symbol pair The resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom are set as reference signal resource element pairs.

  Similarly, in FIG. 8, the resource element pairs in the second, sixth, eighth, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as reference signal resource element pairs, and the fourth OFDM symbol is set. Resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the symbol pair are set as reference signal resource element pairs.

  5) A data resource element pair is distinguished from resource element pairs other than the reference signal resource element pair.

  In FIG. 3, the resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and the second Resource element pairs in the first to third, fifth to ninth, eleventh, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and below the third OFDM symbol pair. The resource element pairs in the second, third, fifth, sixth, eighth, eleventh, and twelfth subcarriers are set as data resource element pairs, and the first from the bottom of the fourth OFDM symbol pair A resource element pair in the twelfth subcarrier is defined as a data resource element pair. Set, the second from the bottom in the fifth OFDM symbol pair, 4 th, 6 th, 8 th, 10 th, and the resource element pairs in 12-th sub-carrier, sets a data resource element pairs.

  In FIG. 5, resource element pairs in the second, fifth, eighth, and eleventh subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and below the second OFDM symbol pair. To the second, third, fifth, sixth, eighth, ninth, eleventh, and twelfth subcarriers as data resource element pairs, and below the third OFDM symbol pair. The resource element pairs in the third, sixth, ninth and twelfth subcarriers are set as data resource element pairs.

  In FIG. 6, resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and the second Resource element pairs in the first to third, fifth to ninth, eleventh, and twelfth subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and below the third OFDM symbol pair. To the second, third, fifth, sixth, eighth, ninth, eleventh, and twelfth subcarriers as data resource element pairs and below the fourth OFDM symbol pair. To the second, fourth, sixth, eighth, tenth and twelfth subcarriers The element pair is set as a data resource element pair, and the resources in the second, third, fifth, sixth, eighth, ninth, eleventh, and twelfth subcarriers from the bottom of the fifth OFDM symbol pair Set the element pair as a data resource element pair.

  In FIG. 7, the resource element pairs in the third, fifth, ninth, and eleventh subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and below the second OFDM symbol pair. The resource element pairs in the first to third, fifth to ninth, eleventh, and twelfth subcarriers from the first to third are set as data resource element pairs, and the second and third from the bottom of the third OFDM symbol pair Resource element pairs in the fifth, sixth, eighth, ninth, eleventh, and twelfth subcarriers are set as data resource element pairs, and the second and sixth from the bottom of the fourth OFDM symbol pair , 8th, and 12th subcarriers are referred to as data resource elements. It is set as the instrument pairs.

  Similarly, in FIG. 8, the resource element pairs in the third, fifth, ninth, and eleventh subcarriers from the bottom of the first OFDM symbol pair are set as data resource element pairs, and the second OFDM symbol is set. The resource element pairs in the first to third, fifth to ninth, eleventh, and twelfth subcarriers from the bottom of the pair are set as data resource element pairs, and the second from the bottom of the third OFDM symbol pair The resource element pairs in the third, fifth, sixth, eighth, ninth, eleventh, and twelfth subcarriers are set as data resource element pairs, and the second from the bottom of the fourth OFDM symbol pair , 6th, 8th, and 12th subcarriers in the data It is set as the over scan element pairs.

  The resource block partitioning method in the above example 1 and example 2 may notify the user terminal device in a scheme promised in advance by the base station and the user terminal device, and performs signaling on the physical layer broadcast channel or the control channel. You may notify to a user terminal device by the system which transmits.

  Although the data transmission method in the embodiment of the present invention has been described in detail above, a data transmission apparatus to which the above method in the embodiment of the present invention is applied will be described in detail below.

  FIG. 9 is an exemplary configuration diagram of a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 9, this apparatus can include a time-frequency resource partitioning unit, a data mapping unit, a transmission frame generation unit, and a data transmission unit.

  Here, the time frequency resource partitioning means partitions at least one orthogonal frequency division multiplexing (OFDM) symbol pair from the time frequency resource of the current subframe, and two OFDM symbols adjacent in time for each OFDM symbol pair. 2, OFDM symbols in different OFDM symbol pairs do not overlap, and two resource elements RE adjacent by the same subcarrier in the same OFDM symbol pair constitute one resource element pair, and at least one resource element pair Is set as a reference signal resource element pair, and at least one resource element pair among the other resource element pairs other than the reference signal resource element pair is set as a data resource element pair.

  The data mapping means maps the first setting reference signal in a manner in which the data in the two resource elements is the same in the reference signal resource element pair, and one or two data symbols in the data resource element pair When mapping one data symbol in the data resource element pair, the data symbol is mapped in a manner that makes the data in the two resource elements the same, and two data in the data resource element pair. When mapping symbols, the two data symbols are mapped to two resource elements, respectively, to other resource elements other than the reference signal resource element pair and the data resource element pair. Stomach, to map the other transmitted data.

  The transmission frame generation means generates a transmission signal corresponding to the OFDM symbol, configures the transmission signal corresponding to the generated OFDM symbol as a transmission frame, and generates a transmission signal corresponding to the OFDM symbol. Corresponding to the first resource element before the first resource element in the reference signal resource element pair and the data resource element pair for the reference signal resource element pair and the data resource element pair in each OFDM symbol pair A first cyclic guard period obtained by duplicating the signal at the end of the time domain signal is added, and after the second resource element in the reference signal resource element pair and the data resource element pair, it corresponds to the second resource element. Time It is added to the second circulation guard period obtained by copying a signal of a leading portion of the signal.

  The data transmission means transmits the generated transmission frame.

  Corresponding to the data transmission method in the embodiment of the present invention, the transmission frame generation means further generates a transmission signal corresponding to the OFDM symbol, in addition to the reference signal resource element pair and the data resource element pair. A first cyclic guard period is added before each resource element.

  Specifically, when the transmission frame generating means generates the transmission signal corresponding to the OFDM symbol, the transmission frame generating means corresponds to the data transmission method in the embodiment of the present invention, and the reference signal resource element pair in the OFDM symbol pair and A first cyclic guard period is added to a data resource element pair before a first resource element in the reference signal resource element pair and the data resource element pair, and the reference signal resource element pair and the data resource element pair A second cyclic guard period is added after the second resource element in and each resource element with respect to other resource elements other than the reference signal resource element pair and the data resource element pair in the OFDM symbol pair Before, specific implementation method for adding the first circulation guard period, likewise there are some.

  Corresponding to the first type of data transmission method in the embodiment of the present invention, the transmission frame generation means in the apparatus of the present embodiment performs the first operation for each OFDM symbol pair before the first OFDM symbol. 1 cyclic guard period is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, a second cyclic guard period is added after the second OFDM symbol, and the OFDM symbol pair In this case, the data mapping means, before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair, And then try to map to the second resource element in the OFDM symbol pair When a transmission signal corresponding to an OFDM symbol is generated by compensating the phase of one other transmission target data, a first cyclic guard period is set before the first other transmission target data. Add.

  Corresponding to the second type of data transmission method according to the embodiment of the present invention, the transmission frame generation means includes the first OFDM symbol before the first OFDM symbol for each OFDM symbol pair. Is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and the second OFDM symbol of the OFDM symbol pair is assigned to all the OFDM symbols. The second resource element in the reference signal resource element pair and the data resource element pair is included, and padded with 0s at positions corresponding to other resource elements other than the second resource element in the reference signal resource element pair and the data resource element pair First part OFDM symbol and reference signal resource A second resource element other than the second resource element in the element pair and the data resource element pair is included, and the second resource element in the reference signal resource element pair and the data resource element pair is padded with 0 at the location of the second resource element The OFDM symbol of the first part is divided into two parts, the second cyclic guard period is added after the OFDM symbol of the first part, and the OFDM symbol of the second part is added. A first cyclic guard period is added, and then the two parts of the OFDM symbol are added to form the transmission signal of the second OFDM symbol of the OFDM symbol pair.

  Corresponding to the data transmission method in the embodiment of the present invention, only the resource elements carrying specific types of sensitive data other than the reference signal resource element pair and the data resource element pair in the OFDM symbol pair are used in actual application. On the other hand, a first circulation guard period may be added before each resource element. The specific implementation method of such a situation may be similar to the two specific implementation methods listed above.

  For example, for the first type of method, the data mapping means performs the second mapping in the OFDM symbol pair before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair. When generating a transmission signal corresponding to an OFDM symbol by compensating the phase for a specific type of sensitive data to be mapped to a resource element, the first type of sensitive data is preceded by a first Add a circulation guard period. When generating a transmission signal corresponding to an OFDM symbol, the transmission frame generating means adds a first cyclic guard period before the first OFDM symbol for each OFDM symbol, and A transmission signal of the first OFDM symbol is formed, and a second cyclic guard period is added after the second OFDM symbol to form a transmission signal of the second OFDM symbol of the OFDM symbol pair.

  Also, for example, for the second type of method, the transmission frame generation means copies the signal at the end of the first OFDM symbol before the first OFDM symbol for each OFDM symbol pair. A cyclic guard period is added to form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and the second OFDM symbol of the OFDM symbol pair is replaced with a resource element other than a resource element carrying a specific type of sensitive data. All resource elements are included, the first part of the OFDM symbol padded with zeros at the position of the resource element carrying the specific type of sensitive data, and the resource element carrying the specific type of sensitive data, All resource elements except resource elements that carry specific types of sensitive data Are divided into two parts, the second part of the OFDM symbol padded with zeros, and the second cyclic guard period is added after the OFDM part of the first part, The first cyclic guard period is added before the two parts of the OFDM symbol, and then the two parts of the OFDM symbols are added to form the transmission signal of the second OFDM symbol of the OFDM symbol pair. .

  Corresponding to the data transmission method in the embodiment of the present invention, the first setting reference signal may be an existing reference signal in the prior art or may be a newly added reference signal.

  When the first setting reference signal is a newly added signal, the time-frequency resource partitioning means includes a physical layer control channel resource, an instruction channel resource, a physical layer broadcast channel resource, a synchronization signal resource, a cell reference signal resource in the frame structure, Based on the position of any one or any combination of the demodulation reference signal resource and the channel state information reference signal resource, the partitioned OFDM symbol pair includes the physical layer control channel, the indication channel, and the physical layer broadcast channel. Any one of or any combination of information transmission and / or any one of synchronization signal, cell reference signal, demodulation reference signal, channel state information reference signal or any The time frequency of the current subframe so as not to affect the transmission of the combination From a resource partitioning at least one OFDM symbol pair. The specific partitioning principle may be consistent with the two exemplary descriptions of the method above.

  Then, the time-frequency resource partitioning unit partitions at least one resource element pair in each subcarrier of a predetermined resource block as a reference signal resource element pair. Resource in which one or any combination of layer control channel resource, instruction channel resource, physical layer broadcast channel resource, synchronization signal resource, cell reference signal resource, demodulation reference signal resource, channel state information reference signal resource is located Based on the position of the element, an available resource element pair is set in the OFDM symbol pair divided from the predetermined resource block, and the available resource in one subcarrier of the predetermined resource block If Remento pairs is two or more pairs, at least one of the available resource elements pairs in the sub-carrier, to distinguish as the reference signal resource elements pairs. The specific partitioning principle may be consistent with the two exemplary descriptions of the method above.

  When the first setting reference signal is an existing signal and includes, for example, at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal, the time-frequency resource partitioning unit is configured to detect the position of the OFDM symbol pair In accordance with the principle of matching the number of OFDM symbol pairs to the number of OFDM symbols used by the first set reference signal in LTE At least one OFDM symbol pair is distinguished from the time-frequency resource of the subframe, the position of the reference signal resource element pair is close to the position of the resource element used by the first set reference signal in LTE, and the reference signal resource The first setting reference signal used in LTE for the number of element pairs According to the principles to match the number of resource elements that is set as a reference signal resource elements-to at least one resource element pairs.

  Corresponding to the data transmission method in the embodiment of the present invention, as shown in the dotted line part of FIG. 9, the apparatus is a channel among the users receiving each resource block in the time-frequency resource of the current subframe. The information processing apparatus further includes a determination unit that determines whether there is a user whose quality and the receiving side satisfy a predetermined condition.

  The time-frequency resource partitioning means performs an operation of partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe when there is a user who satisfies a predetermined condition of channel quality and receiving side among the users. Run.

  In this case, the data mapping means is sensitive data for all data to be mapped to the second OFDM symbol in each OFDM symbol pair in the channel quality and the resource block to be received by the user whose receiving side does not satisfy the predetermined condition. Or all the resource elements in the user's reception target resource block whose channel quality and the receiving side do not satisfy the predetermined condition are processed as other resource elements other than the reference signal resource element pair and the data resource element pair. it can.

  When specifically realized, a part or all of the components of the apparatus of the present embodiment may be a hardware circuit or a program code. The apparatus may further comprise a processor (not shown) and a computer readable storage medium (not shown).

  Here, the constituent part realized by the program code is the program code stored in the computer-readable storage medium.

  The processor executes program code in the computer-readable storage medium.

  For those skilled in the art, it should be understood that the drawings are merely exemplary illustrations of one preferred embodiment, and that the modules or flows in the drawings are not necessarily required to practice the invention. Can do.

  For those skilled in the art, the modules in the example apparatus may be distributed in the example apparatus according to the description of the example, and may be located in one or more apparatuses different from this example, with corresponding changes. You may do it. The modules in the above embodiments may be merged into one module, or may be further divided into a plurality of submodules.

  Some steps in the embodiments of the present invention can be realized using software, and the corresponding software program may be stored in a readable storage medium such as an optical disk or a hard disk.

  While the above specific embodiments have described the objects, solutions, and beneficial effects of the present invention in more detail, it should be understood that the above are only preferred embodiments of the present invention and It does not limit the protection range. All modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (25)

A data transmission method,
At least one orthogonal frequency division multiplexing (OFDM) symbol pair is partitioned from the time frequency resources of the current subframe, and each OFDM symbol pair includes two OFDM symbols that are adjacent in time, and OFDM in different OFDM symbol pairs. Two resource elements (RE) adjacent to each other in the same subcarrier in the same OFDM symbol pair that do not overlap with each other constitute one resource element pair, and
Configuring at least one resource element pair as a reference signal resource element pair, mapping the first set reference signal in a manner in which data in the two resource elements is the same in the reference signal resource element pair;
At least one resource element pair other than the reference signal resource element pair is set as a data resource element pair, and one or two data symbols are mapped in the data resource element pair, and the data resource When mapping one data symbol in an element pair, mapping the data symbol in a manner that makes data in two resource elements the same, and mapping two data symbols in the data resource element pair, Map two data symbols to two resource elements respectively
In other resource elements other than the reference signal resource element pair and the data resource element pair, map other transmission target data,
When generating a transmission signal corresponding to an OFDM symbol, a reference signal resource element pair and a data resource element pair in the OFDM symbol pair are preceded by a first resource element in the reference signal resource element pair and the data resource element pair. Is added with a first cyclic guard period in which a signal at the end of the time domain signal corresponding to the first resource element is duplicated, and the second resource element of the reference signal resource element pair and the data resource element pair Later, a second cyclic guard period that duplicates the signal at the beginning of the time domain signal corresponding to the second resource element is added,
Configuring a transmission signal corresponding to the generated OFDM symbol as a transmission frame, and transmitting the transmission frame;
A method comprising: When generating a transmission signal corresponding to an OFDM symbol, a first cyclic guard period is added before each resource element to other resource elements other than the reference signal resource element pair and the data resource element pair. Further including
The method according to claim 1. The generation of the transmission signal corresponding to the OFDM symbol includes a first cyclic guard period in which a signal at the end of the first OFDM symbol is copied before the first OFDM symbol for each OFDM symbol pair. To form a transmission signal of the first OFDM symbol of the OFDM symbol pair, and after the second OFDM symbol, a second cyclic guard period in which the signal at the beginning of the second OFDM symbol is duplicated To form a transmission signal of the second OFDM symbol of the OFDM symbol pair, and
Before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair, the first other transmission to be mapped to the second resource element in the OFDM symbol pair When a transmission signal corresponding to an OFDM symbol is generated by compensating the phase of the target data, a first cyclic guard period is added before the first other transmission target data. In addition,
The method according to claim 2. Generating a transmission signal corresponding to the OFDM symbol,
For each OFDM symbol pair, a first cyclic guard period obtained by duplicating the signal at the end of the first OFDM symbol is added before the first OFDM symbol, and the first OFDM symbol of the OFDM symbol pair is added. Forming a transmission signal of a symbol, the second OFDM symbol of the OFDM symbol pair including the second resource element in all reference signal resource element pairs and data resource element pairs, and corresponding to other resource elements The second part of the reference signal resource element pair and the data resource element pair are filled with 0 in the first part OFDM symbol padded with 0 and other resource elements. The process is divided into two parts, the partial OFDM symbol. The second cyclic guard period is added after the first part OFDM symbol, the first cyclic guard period is added before the second part OFDM symbol, and then two Adding the partial OFDM symbols to form a transmission signal of the second OFDM symbol of the OFDM symbol pair;
The method of claim 2, comprising: Partitioning at least one OFDM symbol pair from the time frequency resources of the current subframe is:
Any one or any combination of physical layer control channel resources, instruction channel resources, physical layer broadcast channel resources, synchronization signal resources, cell reference signal resources, demodulation reference signal resources, channel state information reference signal resources in the frame structure And the partitioned OFDM symbol pair does not affect information transmission of any one or any combination of the physical layer control channel, the indication channel, and the physical layer broadcast channel, and / or Alternatively, at least one from the time-frequency resource of the current subframe so as not to affect transmission of any one or any combination of a synchronization signal, a cell reference signal, a demodulation reference signal, and a channel state information reference signal Partition two OFDM symbol pairs,
The method of claim 1, comprising: Configuring the at least one resource element pair as a reference signal resource element pair;
Setting at least one resource element pair in each subcarrier of a given resource block as a reference signal resource element pair;
6. The method of claim 5, comprising: Configuring the at least one resource element pair as a reference signal resource element pair;
Any one or any combination of physical layer control channel resources, instruction channel resources, physical layer broadcast channel resources, synchronization signal resources, cell reference signal resources, demodulation reference signal resources, channel state information reference signal resources in the frame structure Based on the position of the resource element where the resource element is located, an available resource element pair is set in the OFDM symbol pair partitioned from a predetermined resource block,
When there are two or more usable resource element pairs in one subcarrier of the predetermined resource block, at least one usable resource element pair in the subcarrier is set as a reference signal resource element pair.
6. The method of claim 5, comprising: The time frequency resource of the current subframe does not transmit a main synchronization signal, a sub synchronization signal, a physical layer broadcast channel, and an uplink / downlink switching guard period (GP), but a physical layer control channel, a cell A resource block for transmitting a reference signal and a channel state information reference signal is included, and the resource block is arranged from left to right in the order of old OFDM symbol transmission time, with the OFDM symbol as an abscissa. The carriers are arranged from the top to the bottom in descending order of the subcarrier frequency, with the ordinate as the ordinate.
The partitioning of at least one OFDM symbol pair from the time frequency resource of the current subframe is the sixth and seventh from the resource block with the third and fourth OFDM symbols from the left as the first OFDM symbol pair. The th OFDM symbol as the second OFDM symbol pair, the eighth and ninth OFDM symbols as the third OFDM symbol pair, the tenth and eleventh OFDM symbols as the fourth OFDM symbol pair, the thirteenth and Partitioning the 14th OFDM symbol as a fifth OFDM symbol pair,
The setting of the at least one resource element pair as a reference signal resource element pair is in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the first OFDM symbol pair. The resource element pair is set as a reference signal resource element pair, and the resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the fifth OFDM symbol pair are Including setting as a reference signal resource element pair,
The method according to claim 7. The time frequency resource of the current subframe does not transmit the main synchronization signal, the physical layer broadcast channel, and the uplink / downlink switching guard period (GP), but the sub synchronization signal, the physical layer control channel, and the cell A resource block for transmitting a reference signal and a channel state information reference signal is included, and the resource block is arranged from left to right in the order of old OFDM symbol transmission time, with the OFDM symbol as an abscissa. The carriers are arranged from the top to the bottom in descending order of the subcarrier frequency, with the ordinate as the ordinate.
The partitioning of at least one OFDM symbol pair from the time frequency resource of the current subframe is the sixth and seventh from the resource block with the third and fourth OFDM symbols from the left as the first OFDM symbol pair. The 12th OFDM symbol as the second OFDM symbol pair, the 8th and 9th OFDM symbols as the 3rd OFDM symbol pair, the 10th and 11th OFDM symbols as the 4th OFDM symbol pair, and the 12th and Partitioning the thirteenth OFDM symbol as a fifth OFDM symbol pair,
The setting of the at least one resource element pair as a reference signal resource element pair is in the second, fourth, sixth, eighth, tenth, and twelfth subcarriers from the bottom of the first OFDM symbol pair. The resource element pair is set as a reference signal resource element pair, and the resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the fourth OFDM symbol pair are Including setting as a reference signal resource element pair,
The method according to claim 7. The current subframe is a special subframe including a downlink pilot transmission time slot, an uplink / downlink switching guard period (GP), and an uplink pilot transmission time slot. A first resource block that does not transmit a synchronization signal and a physical layer broadcast channel, but transmits a main synchronization signal, a physical layer control channel, a cell reference signal, and a channel state information reference signal; and The first resource block is arranged from left to right in the order of the OFDM symbol transmission time from the left to the right with the OFDM symbol as the abscissa, and from the top to the bottom in the descending order of the subcarrier frequency with the ordinate Is to arrange
Partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe includes 6th and 5th OFDM symbols from the left as the first OFDM symbol pair from the first resource block. Partition the 8th and 7th OFDM symbols as the 2nd OFDM symbol pair, the 8th and 9th OFDM symbols as the 3rd OFDM symbol pair, and the 10th and 11th OFDM symbols as the 4th OFDM symbol pair Including,
Setting the at least one resource element pair as a reference signal resource element pair is the second, sixth, eighth, and twelfth subcarriers from the bottom of the first OFDM symbol pair in the first resource block. Is set as a reference signal resource element pair, and resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the fourth OFDM symbol pair are set. Including as a reference signal resource element pair,
The method according to claim 7. The time frequency resource of the current subframe does not transmit the main synchronization signal, the sub synchronization signal, and the physical layer broadcast channel, but transmits the physical layer control channel, the cell reference signal, and the channel state information reference signal. And the second resource block is arranged from left to right in the order of the OFDM symbol transmission time, from the left to the right, and the subcarriers as the ordinate , Which are arranged from top to bottom in descending order of subcarrier frequency,
Partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe includes 6th and 5th OFDM symbols from the left as the first OFDM symbol pair from the second resource block. Partition the 8th and 7th OFDM symbols as the 2nd OFDM symbol pair, the 8th and 9th OFDM symbols as the 3rd OFDM symbol pair, and the 10th and 11th OFDM symbols as the 4th OFDM symbol pair Including,
Setting the at least one resource element pair as a reference signal resource element pair is the second, sixth, eighth, and twelfth subcarriers from the bottom of the first OFDM symbol pair in the second resource block. Is set as a reference signal resource element pair, and resource element pairs in the first, third, fifth, seventh, ninth, and eleventh subcarriers from the bottom of the fourth OFDM symbol pair are set. Including as a reference signal resource element pair,
The method according to claim 10. The time frequency resource of the current subframe does not transmit a main synchronization signal and an uplink / downlink switching guard period (GP), but a physical layer broadcast channel, a physical layer control channel, a cell reference signal, a channel A resource block for transmitting a state information reference signal, a demodulation reference signal, and a sub-synchronization signal is included, and the resource block has an OFDM symbol as an abscissa and the OFDM symbol transmission time from oldest to lowest Are arranged in order from the largest in the frequency of the subcarriers, with the subcarriers as ordinates,
The partitioning of at least one OFDM symbol pair from the time frequency resource of the current subframe is the sixth and seventh from the resource block with the third and fourth OFDM symbols from the left as the first OFDM symbol pair. Partitioning the th OFDM symbol as a second OFDM symbol pair and the twelfth and thirteenth OFDM symbols as a third OFDM symbol pair,
Setting the at least one resource element pair as a reference signal resource element pair refers to the resource element pairs in the third, sixth, ninth, and twelfth subcarriers from the bottom of the first OFDM symbol pair. Setting as a signal resource element pair, and setting resource element pairs in the second, fifth, eighth, and eleventh subcarriers from the bottom of the third OFDM symbol pair as reference signal resource element pairs. ,
The method according to claim 7. The other transmission target data includes at least one of a cell reference signal, a channel state information reference signal, and data demodulated using the cell reference signal.
13. A method according to any one of claims 5 to 12, characterized in that The first setting reference signal includes at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal,
Distinguishing at least one OFDM symbol pair from the time frequency resources of the current subframe brings the position of the OFDM symbol pair close to the position of the OFDM symbol used by the first configuration reference signal in LTE and OFDM Partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe according to the principle of matching the number of symbol pairs with the number of OFDM symbols used by the first configuration reference signal in LTE;
Setting the at least one resource element pair as a reference signal resource element pair means that the position of the reference signal resource element pair is close to the position of the resource element used by the first setting reference signal in LTE, and the reference signal Configuring at least one resource element pair as a reference signal resource element pair according to the principle of matching the number of resource element pairs with the number of resource elements used by the first configuration reference signal in LTE;
The method according to claim 1. The first setting reference signal includes a cell reference signal;
Separating at least one OFDM symbol pair from the time-frequency resource of the current subframe arranges the OFDM symbols as abscissas and arranges the subcarriers vertically from left to right in the order of the OFDM symbol transmission time. For each resource block arranged in the descending order of the subcarrier frequency as coordinates, the third and third OFDM symbols from the resource block are defined as the first OFDM symbol pair from the left. And the fourth OFDM symbol as the second OFDM symbol pair, the fifth and sixth OFDM symbols as the third OFDM symbol pair, the eighth and ninth OFDM symbols as the fourth OFDM symbol pair, 10 The 11th and 11th OFDM symbols are taken as the fifth OFDM symbols. As Bol pair, partitioning the 12 th and 13 th OFDM symbols as OFDM symbols pairs of sixth, said method comprising,
Setting the at least one resource element pair as a reference signal resource element pair corresponds to the first antenna port for the resource element pair in the first and seventh subcarriers from the bottom of the first OFDM symbol pair. Set as a reference signal resource element pair, set resource element pairs in the fourth and tenth subcarriers from the bottom of the third OFDM symbol pair as reference signal resource element pairs corresponding to the first antenna port, The resource element pairs in the first and seventh subcarriers from the bottom of the four OFDM symbol pairs are set as reference signal resource element pairs corresponding to the first antenna port, and the fourth from the bottom of the sixth OFDM symbol pair And on the 10th subcarrier Are set as reference signal resource element pairs corresponding to the first antenna port, and the resource element pairs in the fourth and tenth subcarriers from the bottom of the first OFDM symbol pair are set to the second antenna. The reference signal resource element pair corresponding to the port is set, and the resource element pair in the first and seventh subcarriers from the bottom of the third OFDM symbol pair is used as the reference signal resource element pair corresponding to the second antenna port. And a resource element pair in the fourth and tenth subcarriers from the bottom of the fourth OFDM symbol pair is set as a reference signal resource element pair corresponding to the second antenna port, and the sixth OFDM symbol pair 1st and 7th sub from the bottom The resource element pair in the carrier is set as the reference signal resource element pair corresponding to the second antenna port, and the resource element pair in the first and seventh subcarriers from the bottom of the second OFDM symbol pair is set to the third The reference signal resource element pair corresponding to the antenna port is set as the reference signal resource element pair corresponding to the antenna port, and the resource element pair in the first and seventh subcarriers from the bottom of the fifth OFDM symbol pair is set as the reference signal resource element pair corresponding to the third antenna port. The resource element pairs in the fourth and tenth subcarriers from the bottom of the second OFDM symbol pair are set as reference signal resource element pairs corresponding to the fourth antenna port, and the fifth OFDM symbol pair 4th and 10th from the bottom Setting a resource element pair in the subcarrier of the eye as a reference signal resource element pair corresponding to the fourth antenna port,
15. The method of claim 14, wherein: The other transmission target data includes a reference signal other than the first setting reference signal among the cell reference signal, a demodulation reference signal, and a channel state information reference signal, a physical layer control channel resource, an instruction channel resource, a physical layer broadcast Including at least one of a channel resource and a synchronization signal resource,
16. A method according to claim 14 or 15, characterized in that Before distinguishing at least one OFDM symbol pair from the time-frequency resource of the current subframe, among the users who receive each resource block in the time-frequency resource of the current subframe, the channel quality and the receiving side have predetermined conditions. Determining whether there is a user satisfying the condition, and if there is a user who satisfies the channel quality and the receiver satisfies the predetermined condition, distinguishing at least one OFDM symbol pair from the time frequency resources of the current subframe, Including
Other resource elements other than the reference signal resource element pair and the data resource element pair include all the resource elements in the reception target resource block of the user whose channel quality and the reception side do not satisfy the predetermined condition.
The method according to any one of claims 1 to 12, 14, and 15. A data transmission device,
At least one orthogonal frequency division multiplexing (OFDM) symbol pair is partitioned from the time frequency resources of the current subframe, and each OFDM symbol pair includes two OFDM symbols that are adjacent in time, and OFDM in different OFDM symbol pairs. Two resource elements (RE) adjacent to each other with the same subcarrier in the same OFDM symbol pair that do not overlap symbols constitute one resource element pair, and at least one resource element pair is set as a reference signal resource element pair And a time-frequency resource partitioning means for setting at least one resource element pair as a data resource element pair among other resource element pairs other than the reference signal resource element pair;
In the reference signal resource element pair, a first setting reference signal is mapped in a manner that makes data in two resource elements the same, and in the data resource element pair, one or two data symbols are mapped, When mapping one data symbol in a data resource element pair, mapping the data symbol in a manner that makes the data in the two resource elements the same, and mapping two data symbols in the data resource element pair The two data symbols are respectively mapped to two resource elements, and other transmission target data is transmitted in other resource elements other than the reference signal resource element pair and the data resource element pair. And data mapping means for mapping data,
A transmission signal corresponding to the OFDM symbol is generated, and the transmission signal corresponding to the generated OFDM symbol is configured as a transmission frame. Here, when generating the transmission signal corresponding to the OFDM symbol, in each OFDM symbol pair For the reference signal resource element pair and the data resource element pair, the last part of the time domain signal corresponding to the first resource element before the first resource element in the reference signal resource element pair and the data resource element pair Is added to the first cyclic guard period, and after the second resource element in the reference signal resource element pair and the data resource element pair, the head part of the time domain signal corresponding to the second resource element Signal Transmission frame generating means for adding the second circulation guard period was manufactured,
Data transmission means for transmitting the generated transmission frame;
A device comprising: The transmission frame generation means further adds a first cyclic guard period before other resource elements other than the reference signal resource element pair and the data resource element pair when generating a transmission signal corresponding to the OFDM symbol. Let
The apparatus according to claim 18. The transmission frame generation means adds a first cyclic guard period before the first OFDM symbol for each OFDM symbol pair to form a transmission signal of the first OFDM symbol of the OFDM symbol pair. A second cyclic guard period is added after the second OFDM symbol to form a transmission signal of the second OFDM symbol of the OFDM symbol pair;
The data mapping means tries to map to the second resource element in the OFDM symbol pair before mapping other transmission target data in other resource elements other than the reference signal resource element pair and the data resource element pair. When the transmission signal corresponding to the OFDM symbol is generated by compensating the phase of the first other transmission target data, the first cyclic guard is provided before the first other transmission target data. Add a period,
The apparatus of claim 19. The transmission frame generation means adds a first cyclic guard period in which a signal at the end of the first OFDM symbol is copied before the first OFDM symbol for each OFDM symbol pair, A transmission signal of the first OFDM symbol of the symbol pair is formed, the second OFDM symbol of the OFDM symbol pair includes the second resource element in all reference signal resource element pairs and data resource element pairs, and others The first part of the OFDM symbol padded with 0 in the position corresponding to the resource element and other resource elements are included, and the position corresponding to the second resource element in the reference signal resource element pair and the data resource element pair OFDM thin of the second part padded with zeros The second cyclic guard period is added after the OFDM symbol of the first part, and the first cyclic is added before the OFDM symbol of the second part. Adding a guard period and then adding the two parts of the OFDM symbol to form the transmission signal of the second OFDM symbol of the OFDM symbol pair;
The apparatus of claim 19. The time frequency resource partitioning means includes physical layer control channel resources, instruction channel resources, physical layer broadcast channel resources, synchronization signal resources, cell reference signal resources, demodulation reference signal resources, channel state information reference signal resources in a frame structure. Based on the location of any one or any combination, the segmented OFDM symbol pair may transmit information of any one or any combination of the physical layer control channel, the indication channel, and the physical layer broadcast channel. And / or does not affect transmission of any one or any combination of a synchronization signal, a cell reference signal, a demodulation reference signal, and a channel state information reference signal. From at least one time frequency resource. Partitioning the Bol pair,
The apparatus of claim 19. The time-frequency resource partitioning unit sets at least one resource element pair in each subcarrier of a predetermined resource block as a reference signal resource element pair, or the time-frequency resource partitioning unit performs physical layer control in a frame structure Channel resource, indication channel resource, physical layer broadcast channel resource, synchronization signal resource, cell reference signal resource, demodulation reference signal resource, channel state information reference signal resource Based on the position, an available resource element pair is set in the OFDM symbol pair divided from the predetermined resource block, and the usable resource element in one subcarrier of the predetermined resource block is set. If pairs is two or more pairs, at least one of the available resource elements pairs in the sub-carrier, it sets as a reference signal resource elements pairs,
The apparatus of claim 22. The first setting reference signal includes at least one of a cell reference signal, a demodulation reference signal, and a channel state information reference signal,
The time-frequency resource partitioning unit sets the position of the OFDM symbol pair close to the position of the OFDM symbol used by the first setting reference signal in LTE, and sets the number of OFDM symbol pairs in LTE to the first setting reference signal. According to the principle of matching the number of OFDM symbols to be used, at least one OFDM symbol pair is partitioned from the time-frequency resource of the current subframe, and the position of the reference signal resource element pair is used by the first set reference signal in LTE. In accordance with the principle of approaching the position of the resource element and matching the number of reference signal resource element pairs to the number of resource elements used by the first configuration reference signal in LTE, at least one resource element pair is referred to as a reference signal resource element. Set as a pair ,
The apparatus of claim 19. Among the users who receive each resource block in the time-frequency resource of the current subframe, further comprises a determination unit that determines whether there is a user who satisfies the channel quality and the receiving side satisfies a predetermined condition,
The time-frequency resource partitioning means performs an operation of partitioning at least one OFDM symbol pair from the time-frequency resource of the current subframe when there is a user who satisfies a channel quality and a receiver satisfies a predetermined condition.
Other resource elements other than the reference signal resource element pair and the data resource element pair include all the resource elements in the reception target resource block of the user whose channel quality and the reception side do not satisfy the predetermined condition.
25. Apparatus according to any one of claims 19 to 24.