WO2011150625A1

WO2011150625A1 - Method and device for mapping resources of downlink control channel

Info

Publication number: WO2011150625A1
Application number: PCT/CN2010/078302
Authority: WO
Inventors: 韩敏刚; 马杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-03
Filing date: 2010-11-01
Publication date: 2011-12-08
Also published as: CN102271402A; CN102271402B

Abstract

The present invention discloses a method and device for mapping resources of a downlink control channel. The method includes: sequencing resource element groups (REGs) of the downlink control channel; assigning sequence numbers in the sequence to Physical Downlink Control CHannel (PDCCH) data of the downlink control channel by using the mapping addresses of Physical Control Format Indicator CHannel (PCFICH) data of the downlink control channel and the mapping addresses of Physical Hybrid automatic repeat request Indicator CHannel (PHICH) data of the downlink control channel; and according to the order of the sequence numbers, obtaining the data of the downlink control channel corresponding to the sequence numbers, thereby implementing resource mapping of the downlink control channel. The present invention avoids buffering the PDCCH data and reduces storage and delay pressure.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for mapping resources in a downlink control channel. BACKGROUND OF THE INVENTION According to the 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) physical layer protocol, the downlink transmission signal uses orthogonal frequency division multiplexing. (Orthogonal Frequency Division Multiplexing, abbreviated as OFDM) technology, that is, each physical resource message on one symbol is carried by mutually orthogonal signals, and these physical resource messages are mapped in a resource grid in advance, and the resource grid is The smallest unit is the Resource Element (RE), and each RE ^ contains a valid data message.

The LTE downlink control channel refers to a PBCH, a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH), and a physical downlink control. Channel (Physical Downlink Control Channel, PDCCH for short), where the PBCH channel data is mapped at a fixed position in a fixed subframe, and sequentially mapped according to the frequency domain subcarrier order, and its mapping is completely static; the latter three channels The data is mapped in the first n ( 1 < n < 3 ) symbols of each subframe, and they are mapped in units of Resource Element Group (REG). Each REG is frequency i or continuous. 4 (without pilot) or 6 (with pilot) RE, corresponding to 4 consecutive modulated data of the control channel, so the data mentioned in this application refers to the four words formed by four modulated data. group. The mapping order of the three channels is as follows: First, the PCFICH channel data is mapped to the first OFDM symbol according to the configuration, and then the PHICH is mapped to the first n symbols according to the configuration and the mapping position of the PCFICH, and finally the remaining REGs Both are used to map the PDCCH channel data. Before mapping the PDCCH, the data is interleaved and cyclically shifted, and then the mapping is completed according to the mapping order of the time domain and the frequency domain. It can be seen from the protocol that the OFDM symbol generation is to map all the subcarrier messages on one symbol, then perform the transformation, transmission, and then process the next symbol. However, PDCCH The data is mapped in the REG order, and does not correspond to the order of the subcarriers in the symbol, that is, the first subcarrier does not correspond to the first data of the PDCCH, and may be the last one, which results in OFDM. Before the symbol is generated, the data of the PDCCH must be all cached in advance, and then the number is taken from the corresponding cache address in the order of subcarriers, which brings great storage and delay pressure to the system. SUMMARY OF THE INVENTION The present invention is directed to the problem that the order of subcarriers does not correspond to the data order of the PDCCH, so that the data of the PDCCH must be cached in advance. Therefore, the main object of the present invention is to provide a downlink control channel. A method and apparatus for resource mapping to solve the above problems. In order to achieve the above object, according to an aspect of the present invention, a method for mapping resources in a downlink control channel is provided. The method for mapping resources in a downlink control channel according to the present invention includes: sorting REGs in a downlink control channel; using a mapping address of data of a PCFICH in a downlink control channel and a mapping address of data of a PHICH in a downlink control channel, The data of the PDCCH in the downlink control channel is assigned a sequence number; the data in the downlink control channel corresponding to the sequence number is obtained in the sequence of the sequence number, so as to implement mapping of resources in the downlink control channel. Further, the REGs are ordered in the order of the time domain after the time domain. Further, using the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the PHICH data in the downlink control channel, assigning the sequenced sequence numbers to the data of the PDCCH in the downlink control channel includes: using symbols in the mapped address The index and the subcarrier index are assigned sequence numbers for the PCFICH and PHICH data; the sequenced sequence numbers are used, and the sequence numbers of the PCFICH and PHICH data are excluded as the sequence numbers of the PDCCH data. Further, obtaining the data in the downlink control channel corresponding to the sequence number according to the sequence number includes: parsing the REG corresponding to the sequence number according to the sequence number; determining that the channel type corresponding to the parsed REG is PCFICH or PHICH; acquiring the PCFICH or The PHICH data is used as the data corresponding to the serial number. Further, the obtaining the data in the downlink control channel corresponding to the sequence number according to the sequence number includes: parsing the REG corresponding to the sequence number according to the sequence number; determining that the channel type corresponding to the parsed REG is the PDCCH; Address before and after interleaving and cyclic shift Corresponding relationship acquires data of the PDCCH as data corresponding to the sequence number. Further, the foregoing method further includes: determining, according to an interleaving and a cyclic shift relationship of the PDCCH, an address correspondence relationship between data of the PDCCH before and after interleaving and cyclic shifting. In order to achieve the above object, according to another aspect of the present invention, a mapping apparatus for resources in a downlink control channel is provided. The apparatus for mapping resources in the downlink control channel according to the present invention includes: a sorting module, configured to sort REGs in a downlink control channel region; and an evaluation module, configured to use a mapping address and a downlink of data of the PCFICH in the downlink control channel The mapping address of the data of the PHICH in the control channel is used to assign the sequenced number to the data of the PDCCH in the downlink control channel; the obtaining module is configured to obtain the data in the downlink control channel corresponding to the sequence number in the order of the sequence number, thereby implementing the downlink Mapping of resources in the control channel. Further, the sorting module sorts the REGs in the order of the time domain after the time domain. Further, the assignment module includes: an assignment submodule, configured to use the symbol index and the subcarrier index in the mapped address to assign the sorted sequence number to the data of the PCFICH and the PHICH; the determining submodule, configured to determine the sorted sequence number and exclude the PCFICH The sequence number of the data of the PHICH and the PHICH is the sequence number of the data of the PDCCH. Further, the obtaining module includes: a parsing sub-module, configured to parse the REG corresponding to the sequence number according to the sequence number; and a second determining sub-module, configured to determine that the channel type corresponding to the parsed REG is PCFICH or PHICH; Obtaining a sub-module, configured to acquire data of a PCFICH or a PHICH as data corresponding to a sequence number; a third determining sub-module, configured to determine that a channel type corresponding to the parsed REG is a PDCCH; and a second acquiring sub-module, configured to use data according to the PDCCH The data of the PDCCH is acquired as the data corresponding to the sequence number in the address correspondence relationship before and after the interleaving and the cyclic shift. With the present invention, the REG and the subcarriers are matched by the REG of the control channel, and the PDCCH data is mapped in the REG order, thereby indirectly establishing the correspondence between the PDCCH data and the subcarrier number, and the subcarrier is solved. The order of the PDCCH does not correspond to the data sequence of the PDCCH, so that the data of the PDCCH must be cached in advance, the data of the PDCCH is avoided, and the storage and delay pressure are reduced. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a method for mapping resources in a downlink control channel according to an embodiment of the present invention; FIG. 2 is a structural block diagram of a device for mapping resources in a downlink control channel according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a correspondence between a single antenna, a CRF value of 3, and a bandwidth of 20M, and a subcarrier; FIG. 4 is a structural diagram of a control channel resource mapping according to an embodiment of the present invention; FIG. 5 is a detailed flowchart of control channel resource mapping in an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. FIG. 1 is a flowchart of a method for mapping resources in a downlink control channel according to an embodiment of the present invention. The method includes the following steps: Step S102: Sort REGs in the downlink control channel. Step S104, using the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the PHICH data in the downlink control channel, assigning the sorted sequence number to the data of the PDCCH in the downlink control channel. Step S106: Obtain data in the downlink control channel corresponding to the sequence number according to the sequence number, thereby implementing mapping of resources in the downlink control channel. In the related art, the order of the subcarriers does not correspond to the data order of the PDCCH, and the data of the PDCCH must be all cached beforehand. In the embodiment of the present invention, the correspondence between the REG and the subcarrier is established by sorting the REGs; then, the sorted sequence numbers are assigned to the data of the PDCCH, The PDCCH data may be mapped in the REG order, thereby indirectly establishing the correspondence between the PDCCH data and the subcarrier sequence number, avoiding buffering of the PDCCH data, and reducing storage and delay pressure. Preferably, the REGs are ordered in the order of the time domain after the time domain. It should be noted that the REG may be numbered in the order of the time domain after the time domain and sequenced from 0 to M, so that the relationship between the REG and the subcarrier can be established. Preferably, using the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the data of the PHICH in the downlink control channel, assigning the sorted sequence number to the data of the PDCCH in the downlink control channel includes: using the symbol in the mapping address The index and the subcarrier index assign the sorted sequence numbers to the PCFICH and PHICH data; use the sorted sequence numbers, and exclude the sequence numbers of the PCFICH and PHICH data as the sequence numbers of the PDCCH data. It should be noted that since the data of the three channels of the PCFICH, the PHICH, and the PDCCH are mapped to the sequence numbers of all the REGs described above, the sequence numbers of the remaining data for the PDCCH can be determined by excluding the sequence numbers of the data of the PCFICH and the PHICH. Then, by corresponding to the data sequence of the PDCCH, and the corresponding relationship between the sequence number and the symbol number and the subcarrier number in FIG. 3, the corresponding relationship between the PDCCH data and the subcarrier is established, so that the sub-carrier can be configured according to the sub-carrier. The carrier sequence maps the data, avoids buffering the PDCCH data, and reduces storage and latency stress. Therefore, the implementation of the preferred embodiment is simple and has high reliability. Preferably, obtaining the data corresponding to the sequence number according to the sequence number includes: parsing the REG corresponding to the sequence number according to the sequence number; determining that the channel type corresponding to the parsed REG is PCFICH or PHICH; obtaining data of the PCFICH or PHICH as the sequence number Corresponding data. Preferably, obtaining the data corresponding to the sequence number according to the sequence number further includes: parsing the REG corresponding to the sequence number according to the sequence number; determining that the channel type corresponding to the parsed REG is the PDCCH; and interleaving and cyclic shift according to the data of the PDCCH The address correspondence between the bits and the bits is obtained, and the data of the PDCCH is acquired as the data corresponding to the sequence number. The address correspondence is determined according to the interleaving and cyclic shift relationship of the PDCCH. It should be noted that the data of the PDCCH is changed before and after the interleaving and cyclic shifting. Therefore, the data of the PDCCH can be accurately obtained through the address correspondence, that is, the number of the PDCCH is accurately obtained. Data. An embodiment of the present invention provides a device for mapping resources in a downlink control channel, where the device may be used to implement a method for mapping resources in the downlink control channel. FIG. 2 is a structural block diagram of a resource mapping apparatus in a downlink control channel, including a sorting module 22, an evaluation module 24, and an obtaining module 26, according to an embodiment of the present invention. The sorting module 22 is configured to sort the REGs. The assignment module 24 is connected to the sorting module 22, for assigning the sorting module 22 to the data of the PDCCH in the downlink control channel by using the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the data of the PHICH in the downlink control channel. The sorting module 26 is connected to the sorting module 22 and the assigning module 24, and is configured to obtain data in the downlink control channel corresponding to the sequence number assigned by the assigning module 24 according to the sequence of the sorting module 22, thereby implementing downlink control. The mapping of resources in the channel. Preferably, the 4th order module 22 is in the order of the REG in the order of the first time domain and the frequency domain. Preferably, the evaluation module 24 includes: an assignment sub-module 242 and a determination sub-module 244. The assignment sub-module 242 is coupled to the sorting module 22, configured to use the symbol index and the sub-carrier index in the mapped address to assign the sequence number of the sorting module 22 to the data of the PCFICH and the PHICH; the determining sub-module 244 is connected to the sorting module 22 and The assignment sub-module 242 is configured to determine the sequence number of the sorting module 22 and exclude the sequence number assigned by the assignment sub-module 242 for the data of the PCFICH and the PHICH as the sequence number of the data of the PDCCH. Further, the obtaining module 26 includes a parsing submodule 261, a second determining submodule 262, a first obtaining submodule 263, a third determining submodule 264, and a second obtaining submodule 265. The parsing sub-module 261 is connected to the sorting module 22 and the evaluation module 24 for parsing the REG corresponding to the sequence number assigned by the assignment module 24 in the order of the ordering module 22; the second determining sub-module 262 is configured to determine the parsing The channel type corresponding to the REG parsed by the sub-module 261 is the PCFICH or the PHICH; the first obtaining sub-module 263 is connected to the second determining sub-module 262, and is configured to obtain the data of the PCFICH or the PHICH determined by the second determining sub-module 262 as the serial number. Corresponding data. Similarly, the third determining sub-module 264 is connected to the parsing sub-module 261, configured to determine that the channel type corresponding to the REG parsed by the parsing sub-module 261 is PDCCH; and the second obtaining sub-module 265 is connected to the third determining sub-module 264. And acquiring, according to the address correspondence relationship between the data of the PDCCH and the data before and after the interleaving and the cyclic shift, acquiring the data of the PDCCH as the data corresponding to the sequence number. The following describes the mapping device of the resources in the downlink control channel in detail. The device includes a REG calculation module, a PCFICH and PHICH mapping address calculation module, an interleaving and cyclic shifting module, an analysis and a mapping module, wherein FIG. 3 is a single antenna, having a CFI value of 3 and a bandwidth of 20M according to an embodiment of the present invention. Schematic diagram of the correspondence between REG and subcarriers. In Figure 3, three columns respectively represent three symbols for mapping control channel data, each symbol has 1200 subcarriers, a total of 3600 subcarriers, corresponding to 800 REGs, and symbol 0 has 200 (each REG contains six consecutive segments) Carrier), each of the symbols 1 and 2 (each REG contains 4 consecutive subcarriers).

The REG calculation module generates two tables according to the REG distribution shown in Fig. 3, RAMI, with the symbol number and subcarrier as the address, and the REG sequence number as the content. RAM2, with the REG serial number as the address, with the symbol number and the subcarrier number as the storage contents.

The PCFICH and PHICH map address calculation modules calculate the mapping addresses of the PCFICH and the PHICH. The interleaving and cyclic shifting module generates a RAM in the exchange pattern specified by the protocol, and the address is the data position before the interleaving shift, and the corresponding stored data is the data position after interleaving and cyclic shifting. The parsing module, which parses each REG in sequence, can generate a RAM, and the address corresponds to the subcarrier number, and the content corresponding to the address is the channel type mapped by the RE and the first data of the channel. The mapping module reads the RAM of the parsing module, sends a data request to the data buffer of each channel, maps the requested data to the subcarrier, and sends the data to the IFFT module to complete the OFDM symbol generation. The present invention also provides a preferred embodiment incorporating the technical solutions of the above-described plurality of preferred embodiments, which will be described in detail below with reference to Figs.

The REG calculation module calculates the total number of REGs that can be used for the control channel in the subframe according to the currently configured CFI value, the number of antenna ports, and the bandwidth message, for example, for a single antenna, 20M, and a CFI value of 3 The number of REGs of symbol 0 is 200, the number of REGs of symbol 2 and symbol 3 is 300, and the total number of REGs is 800, and the symbol number and subcarrier number corresponding to each REG can be calculated. At the same time, two RAMs are generated. The RAMI stores the REG number with the symbol number and the subcarrier number as the address; the RAM2 stores the corresponding symbol number and subcarrier number with the REG number as the address. The interleaving and cyclic shifting module mainly performs the interleaving and cyclic shifting operations before mapping the PDCCH data. First, the data is arranged in a row priority order, 32 rows per row, and arranged in thousands of rows, and the integer rows are not in front of the first row. Fill NULL, then according to the exchange pattern specified by the protocol, read the data according to the column priority principle, remove NULL, and finally cyclically shift the data with CELL_ID as the offset, get the final data order, and interleave and shift The data address correspondence relationship before and after is stored, that is, the interleaved data position is used as an address, and the data position before the interleaving is used as the storage content.

The PCFICH and PHICH mapping address calculation module can calculate the symbol number and subcarrier number mapped by each data of the PCFICH and PHICH channels according to the cell ID, the bandwidth configuration, and the PHICH group number, and use the symbol number and the subcarrier number as the The address is read by RAMI, and the REG number mapped by the data can be obtained. At the same time, the read REG number is used as the address, and the data is stored in the RAM3 with a certain mark. For example, the high 2 bits indicate the channel type, and the low lObit indicates the The first few data of the channel, and the remaining REGs are all used to map the PDCCH data. Since the PDCCH still has interleaving and cyclic shift operations before the mapping, it is impossible to determine that the remaining REG mapping is the PDCCH. Data, so unified with 10, bl l lll ll lll to represent. To be interwoven and looped. After the shift module is completed, RAM3 is read sequentially. If the read channel type is PCFICH or PHICH, the data remains unchanged. If the channel type is read as PDCCH for the first time, the interleave and cyclic shift module is queried, and the address is queried. If the data is 0, the read data is the position before the PDCCH interlace mapped by the REG. If the channel type is PDCCH for the second time, the interleave and cyclic shift module is queried, and the query address is 1, and the class 4 dances. While sequentially reading the RAM 3, the RAM 2 is read by the same address. The data read by the RAM 3 indicates the channel type of the REG map and the first data of the channel, which is recorded as ch type index; the data read by the RAM 2 indicates the The symbol number and subcarrier number corresponding to the REG are asdm subcarry index; again, the ofdm subcarry index is used as the address, the ch type index and the cell index are stored as RAM data in the RAM 4, and the RAM 4 indicates each subcarrier of each symbol. The type of control channel mapped and the first few data of the channel. The parsing and mapping module, each symbol reads the RAM 4 according to the subcarrier order, and can determine the channel type mapped by the RE and the first data of the channel, and then request the data of the corresponding bit to be sequentially added to the data buffer of each channel. 4, modulation, MIMO, and finally mapped to the RE, after collecting all the REs of a symbol, start IFFT for OFDM symbol generation. It should be noted that the mapping device for resources in the downlink control channel described in the device embodiment Corresponding to the foregoing method embodiment, the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the foregoing embodiments of the present invention, a method and an apparatus for mapping resources in a downlink control channel are provided.排序 Sorting the multiple REGs, and using the result of the sorting to establish a correspondence between the data of the PDCCH and the subcarriers in the downlink control channel, and solving the problem that the order of the subcarriers does not correspond to the data sequence of the PDCCH, and thus the PDCCH must be The problem of data being cached in advance avoids buffering the PDCCH data and reduces storage and latency pressure. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for mapping resources in a downlink control channel, which is characterized by:

Sorting the resource element group REG in the downlink control channel;

Using a mapping address of a physical control format indication channel PCFICH in the downlink control channel and a mapping address of data of a physical hybrid automatic repeat request indication channel PHICH in the downlink control channel, where the mapping address in the downlink control channel is The data of the physical downlink control channel PDCCH is assigned to the sorted sequence number;

Obtaining data in the downlink control channel corresponding to the sequence number according to the sequence number, so as to implement mapping of resources in the downlink control channel.

2. The method according to claim 1, wherein the REGs are ordered in an order of a pre-time domain post-frequency domain.

The method according to claim 1, wherein the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the data of the PHICH in the downlink control channel are used as the downlink control channel. The data of the PDCCH in the given sequence number assigned to the PDCCH includes:

Using the symbol index and the subcarrier index in the mapping address, assigning the sorted sequence number to the data of the PCFICH and the PHICH;

The sorted sequence number is used, and the sequence numbers of the PCFICH and the PHICH data are excluded as the sequence numbers of the data of the PDCCH.

The method according to claim 1, wherein the obtaining the data in the downlink control channel corresponding to the sequence number according to the sequence number includes:

Determining, according to the sequence number, the REG corresponding to the sequence number; determining that the channel type corresponding to the parsed REG is the PCFICH or the PHICH;

Obtaining data of the PCFICH or the PHICH as data corresponding to the sequence number.

Determining, according to the sequence number, the REG corresponding to the sequence number; determining that the channel type corresponding to the parsed REG is the PDCCH; obtaining, according to the PDCCH data, the address correspondence between the interleaving and the cyclic shift The data of the PDCCH is used as data corresponding to the sequence number.

The method according to any one of claims 1 to 5, further comprising:

Determining an address correspondence relationship between data of the PDCCH before and after interleaving and cyclic shift according to an interleaving and cyclic shift relationship of the PDCCH.

7. A device for mapping resources in a downlink control channel, comprising:

a sorting module, configured to sort the resource element group REG in the downlink control channel region;

An assignment module, configured to: use the mapping address of the data of the PCFICH in the downlink control channel and the mapping address of the data of the PHICH in the downlink control channel, and assign the data of the PDCCH in the downlink control channel to the sorted Serial number

And an obtaining module, configured to obtain data in the downlink control channel corresponding to the sequence number according to the sequence number, to implement mapping of resources in the downlink control channel.

8. The apparatus according to claim 7, wherein the sorting module sorts the REGs in an order of a prior time domain and a frequency domain.

9. The apparatus according to claim 7, wherein the evaluation module comprises:

And an assignment submodule, configured to use the symbol index and the subcarrier index in the mapping address to assign the sorted sequence number to the data of the PCFICH and the PHICH;

And a determining submodule, configured to determine the sorted sequence number and exclude a sequence number of the PCFICH and the PHICH data as a sequence number of the data of the PDCCH.

The device according to claim 7, wherein the obtaining module comprises:

a parsing submodule, configured to parse the REG corresponding to the sequence number according to the sequence of the sequence numbers; a second determining submodule, configured to determine that the channel type corresponding to the parsed REG is the PCFICH or the PHICH;

a first acquiring submodule, configured to acquire data of the PCFICH or the PHICH as data corresponding to the serial number;

a third determining submodule, configured to determine that the channel type corresponding to the parsed REG is the PDCCH;

And a second acquiring sub-module, configured to acquire data of the PDCCH as data corresponding to the sequence number according to an address correspondence relationship between data of the PDCCH and before and after the interleaving and cyclic shifting.