KR101419380B1 - apparatus and method of mapping resource for physical channels in mobile communication system - Google Patents

Abstract

The present invention relates to a resource allocation method and apparatus for a physical channel in a mobile communication system, and more particularly, to a resource allocation method for a physical channel in a mobile communication system, (Physical Control Indicator Channel), a Physical Hybrid ARQ Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH), which are control channels of the physical channels, by using a resource allocation device including an auxiliary memory for storing the two- A sub-frame discrimination step of determining whether a sub-frame to be allocated is a MBSFN, a sub-frame discrimination step in which the sub-frame to which the resource is to be allocated is not an MBSFN If it is determined that the synchronization signal and the physical channel are a Physical Broadcast Channel (PBCH), a PDSCH (Phy a first data channel mapping step of allocating a resource to a reference signal for the PDSCH when a subframe to which the resource is to be allocated is determined to be an MBSFN in the subframe discrimination step, And a second data channel mapping step of allocating resources to a PMCH (Physical Multicast Channel) and a reference signal for the PMCH.

Description

[0001] The present invention relates to a method and apparatus for allocating resources for a physical channel in a mobile communication system,

The present invention relates to a physical channel resource allocation method and apparatus for a mobile communication system, and more particularly, to a method and apparatus for allocating a physical channel resource for a mobile communication system of the present invention to an OFDM modulation scheme used in a next generation mobile communication system The present invention relates to a resource allocation method and apparatus capable of effectively allocating various physical channels to frequency and time resources.

In the conventional CDMA system, the mobile communication technology has been developed by the OFDMA method which shows excellent effects in terms of symbol interference and user multiplexing, and a mapping method for efficiently allocating physical resources is also developing.

The method of allocating physical resources in the downlink and uplink of long term evolution (LTE), which is regarded as a next generation mobile communication standard, is a method of using TDD and FDD.

A time division multiplexing (TDD) scheme is a scheme in which uplink / downlink uses the same frequency band but alternately performs bidirectional transmission on the time axis. The frequency division multiplexing (FDD) scheme is a scheme in which uplink / In order to transmit signals, different frequency bands are allocated and a pair of frequency bands separated by a certain guard band are transmitted. FDD () method.

In other words, LTE uses a scheme of transmitting data by loading data in each physical resource again frequency-divided within the time-division time band.

Specifically, the downlink and the uplink are composed of radio frames each having a period of 10 ms, and each radio frame is composed of 10 subframes having a period of 1 ms.

In addition, the MAC layer that controls the physical layer manages data transmission / reception on a sub-frame basis. One subframe is composed of two slots, and each slot has a time period of 0.5 ms. Each slot is composed of a plurality of resource blocks. Each resource block is composed of 3, 6, or 7 OFDM symbols on the time axis, and 12 or 24 resource units resource element. Twelve or twenty-four resource units are frequency resources corresponding to 180 kHz. The number of resource units constituting each slot is determined by the transmission system bandwidth. In general, the slots can be configured with resource units of 6 (1.4 MHz), 15 (3 MHz), 25 (5 MHz), 50 (10 MHz), 75 (15 MHz) and 100 (20 MHz).

Therefore, one radio frame is composed of 10 subframes or 20 slots, and subframe numbers 0 to 9 are used, and slot numbers 0 to 19 are used.

Also, various physical channels are used in the downlink physical layer, and the types are as follows.

- Physical Downlink Share Channel (PDSCH)

- Physical Broadcast Channel (PBCH)

- Physical Multicast Channel (PMCH)

- Physical Control Indicator Channel (PCFICH)

- Physical Downlink Control Channel (PDCCH)

- Physical Hybrid ARQ Indicator Channel (PHICH)

Each physical channel can be divided into a control channel and a data channel, and PCFICH, PDCCH, PHICH, and PBCH correspond to a control channel, and PMCH and PDSCH correspond to a data channel.

As described above, for the downlink configuration, six channel signals, a synchronization signal, and a reference signal have to be mapped to resources in a subframe. At this time, since a method of calculating frequency and symbol positions for each channel is independent and complex, an efficient method for resource mapping to a physical channel is required.

In order to solve the above problems, a resource allocation method and apparatus for a physical channel in a mobile communication system according to the present invention can reduce the complexity of resource mapping and easily design hardware for calculating frequency and symbol position values, A resource allocation method and apparatus.

According to an aspect of the present invention, there is provided a resource allocation method including: allocating a physical channel, a reference signal, and an auxiliary memory for storing resource information allocated to a synchronization signal in a two- A control channel mapping step of allocating resources to a Physical Control Indicator Channel (PCFICH), a Physical Hybrid ARQ Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH) A subframe discrimination step of determining whether a subframe to which resources are to be allocated is an MBSFN; In a case where it is determined that the subframe to which the resource is to be allocated is not an MBSFN in the subframe determination step, a PBCH (Physical Broadcast Channel), a PDSCH (Physical Downlink Share Channel), and a PDSCH A first data channel mapping step of allocating a resource to a reference signal for the first data channel; And allocating resources to the PMCH (Physical Multicast Channel) and the reference signal for the PMCH, when it is determined that the subframe to which the resource is to be allocated is the MBSFN in the subframe discrimination step, Channel mapping step.

According to an aspect of the present invention, there is provided a resource allocation apparatus for allocating spare resources to a physical channel by referring to resource allocation information stored in a monitoring unit, An address generator for generating an address value of the frame generator; A frame generator for generating subframe data by storing data to be transmitted through the physical channel in the generated address value; And a monitoring unit for storing an address value corresponding to the physical channel generated by the address generating unit.

According to the method and apparatus for allocating physical channel resources for a mobile communication system of the present invention by means of the above-mentioned problems, the effect of facilitating the generation of address values at resource allocation using the flag memory occurs, Efficient resource allocation can be guaranteed within a given operation time.

Further, according to the method and apparatus for allocating physical channel resources for a mobile communication system of the present invention by the above-mentioned problem solving means and the LTE system using the same, complexity of resource mapping operation can be reduced by merely adding a simple configuration, Efficient hardware implementation is possible.

FIG. 1 is a functional block diagram showing functional blocks for the overall LTE configuration of the present invention.
2 is a functional block diagram showing functional blocks of the resource allocation apparatus of the present invention.
FIG. 3 is a comparative diagram illustrating an address area and an LTE subframe in a channel data storage unit of the present invention.
4 is a functional block diagram illustrating a functional block of an address generator of the resource allocation apparatus of the present invention.
5 is a functional block diagram showing all functional blocks of the resource allocation apparatus of the present invention.
6 is a flowchart showing the flow of the resource allocation method of the present invention.
7 is a flowchart showing a flow of a control channel allocation step of the resource allocation method of the present invention.
8 is a flowchart showing a flow of a first data channel mapping step of the resource allocation method of the present invention.
9 is a flowchart illustrating a flow of a second data channel mapping step of the resource allocation method of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification.

Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

Before explaining the physical channel resource allocation method and apparatus for the mobile communication system of the present invention, the physical channel of the LTE downlink will be described.

First, let's look at the main function of the channel for each control channel among the physical channels.

The PCFICH indicates how many control symbols are configured in one subframe. That is, the PCFICH value can be used to know how many OFDM symbols are used as control symbols in the current subframe.

The PHICH informs the terminal of the reception status of data transmitted to the base station through the uplink. That is, the uplink transmission data carried in the resource block is transmitted through the ARQ signal.

The PDCCH transmits resource allocation information, modulation and coding information, HARQ related information, and layer and antenna configuration information of a data channel configured in uplink and downlink.

Of the physical channels, the main function of the data channel is to transmit data used in the upper layer such as MAC or RLC according to the resource allocation scheme.

The PMCH transmits the broadcast service data through the MBSFN subframe, and the PDSCH transmits the RLC control channel or traffic channel data through the Non-MBSFN subframe.

Other factors that constitute the physical channel include a synchronization signal, which is a physical signal used for estimating and compensating the time / frequency offset of the receiver or for estimating the cell ID value, and a channel value distorted by multipath or fading There is a reference signal used for estimation.

FIG. 1 is a functional block diagram showing functional blocks for the overall LTE configuration of the present invention.

Referring to FIG. 1, an LTE system is configured to allocate physical channels to a resource block, and then perform OFDM modulation and transmission.

In addition, the LTE system performs a preprocessing process before allocating a plurality of channel data to a resource block. First, each channel is input to the scrambler 100 in the form of a codeword to which channel coding is applied.

  The channel bit data dispersed by the scrambler device 100 is modulated in one of BPSK, QPSK, 16QAM, 64QAM, and is output as a complex signal according to a channel condition in the symbol mapping apparatus 200. [

The layer mapping apparatus 300 outputs the complex signal as a plurality of layers according to each layer configuration parameter.

The precoder 400 performs a precoding operation of outputting layer mapped signals to 1, 2, and 4 antenna ports according to antenna configuration parameters. That is, the precoder 400 generates and outputs a transmission signal for each antenna for spatial multiplexing or transmit diversity for a multi-input multi-output (MIMO) operation.

A plurality of resource allocation apparatuses 500 allocate the transmission signal to a frequency / time resource according to a channel allocation scheme, and finally OFDM-modulates the transmission signal in an OFDM modulation apparatus 600 and transmits the OFDM modulation signal to an antenna.

Next, a resource allocation method for each physical channel will be described.

The LTE system can use up to four antennas, but since the allocation method is almost the same for each antenna, only one antenna will be described.

First, a resource allocation method for the control channels PCFICH, PHICH, PDCCH, and PBCH will be described.

PCFICH, PHICH and PDCCH are allocated resources in resource unit group REG (resource element group) consisting of four resource elements. Also, REG can be represented by index information of (k, l), where k is a frequency index of the lowest resource unit of the REG and is an OFDM symbol index.

First, we examine how to allocate resources for PCFICH.

The PCFICH is located only at the first symbol of the control channel, and the channel length is fixed to 16 symbols. That is, the PCFICH is composed of four REGs. In addition, a frequency diversity effect can be obtained by arranging each REG at a distance of about 1/4 of the corresponding bandwidth.

Since the PCFICH is always placed at the first symbol position, the l index value is always zero. The index value of k is obtained using Equation (1).

Second, we examine the resource allocation method for PHICH.

The number of OFDM symbols allocated to the PHICH is determined according to the PHICH duration parameter. When the PHICH length parameter is 'normal', only the first OFDM symbol is allocated to the PCICH, and when the PHICH length parameter is 'extended', two or three OFDM symbols are allocated.

In the MBSFN subframe configuration, the PHICH is allocated to two OFDM symbols, and in the non-MBSFN subframe configuration, the PHICH is allocated to the three OFDM symbols. In addition, the frequency diversity effect can be obtained by arranging the symbols allocated to the PHICH by 1/3 of the total bandwidth obtained by using the REG index excluding the REG used in the PCFICH.

Third, a resource allocation method for the PDCCH will be described.

The PDCCH is allocated to some or all of the REGs allocated to the PCFICH and the PHICH. If the number of remaining REGs is greater than the number of REGs in the PDCCH, the remaining portion is filled with <NIL> REG.

The mapping order of the PDCCH is performed according to the REG index. First, the OFDM symbol is allocated starting with the lowest frequency index. When the last OFDM symbol is mapped, the mapping is performed in the direction of increasing the REG frequency index value.

Fourth, we examine the resource allocation method for PBCH.

The PBCH is located only in the second slot of the first subframe. That is, only slot number 1 is allocated. The PBCH is composed of 4 OFDM symbols, and the PBCH is allocated 6 resource blocks in the up and down direction around the DC (frequency 0) at all times on the frequency axis.

The k and l index values are obtained using Equation (2).

Next, a resource allocation method for the data channels PDSCH and PMCH will be described.

In the data channel region, the type of the data data channel to be used is determined according to whether the type of the subframe is MBSFN or Non-MBSFN. PMSCH is used for MBSFN, and PDSCH is used for Non-MBSFN.

The PDSCH is allocated an empty resource unit in the direction of increasing frequency from the first OFDM symbol of the first slot according to the corresponding physical resource block. An empty resource unit as used herein refers to a resource unit in a data channel region that is not allocated to a PBCH, a synchronization signal, or a reference signal, and to which PCFICH, PHICH, and PDCCH are not allocated. The subframe allocated to the PDSCH is a Non-MBSFN subframe in which the PMCH is not transmitted.

The PMCH is allocated a resource unit in the same manner as the PDSCH. Only the reference signal for the MBSFN is used as the reference signal, and only the resource unit not allocated as the reference signal is allocated to the PMCH. The PMCH is allocated resource units in the direction of increasing the frequency index from the first OFDM symbol. Also, the corresponding subframe must be an MBSFN subframe in which the PDSCH is not transmitted.

First, the parameters used in generating the address values of the channel, the synchronous signal, and the reference signal will be described below.

NDLRB: Number of RBs according to system bandwidth

NRBsc: Number of subcarriers present in one RB

NDLsymb: Number of OFDM symbols in one slot

NumAnt: Number of antennas configured in the transmission system

NCP: cyclic prefix form of OFDM symbol

DCIsymb: Number of OFDM symbols for the control channel present in the current subframe

PHICHdur: Number of OFDM symbols that PHICH sustains

NcellID: Cell ID information

2 is a functional block diagram showing functional blocks of the resource allocation apparatus of the present invention.

2, a resource allocation apparatus 500 according to the present invention includes a reference signal unit 510, a channel data storage unit 520, a frame generation unit 550, an address generation unit 530, a synchronization signal generation unit 540, and a monitoring unit 560. [0050]

The reference signal unit 510 generates reference signals for the control channel and the data channel, and allocates physical resources to the reference signals. A configuration for allocating resources for a reference signal, and a configuration for generating a reference signal, if necessary. The reference signal may be generated differently depending on the cell characteristics, the subframe characteristics, and the like.

The channel data storage unit 520 receives the precoded control channel and data channel data from the precoder and stores data during resource allocation for each physical channel and transmits the data to the frame generator 550 .

In general, the channel data storage unit 520 may be implemented as a FIFO (fist input first output).

The frame generation unit 550 receives the reference signal address and data from the reference signal unit 510 and receives the resource allocation information for the physical channel from the address generation unit 530 and outputs the resource allocation information from the synchronization signal generation unit 540 And receives synchronization signal data. And also receives data to be transmitted through each physical channel from the channel data storage unit 520. And allocates channel data according to the received resource allocation information.

Referring to FIG. 3, the frame generator 550 of the present invention can store all data to be transmitted through one subframe. The two-dimensional address values of the frame generator 550 may correspond to the symbol and frequency index values of the subframe, respectively.

When the subframe data is stored in the frame generator 550, the stored data is transmitted to the OFDM modulator 600.

The address generator 530 generates an address on the physical channels and an address on the frame generator 550 of the synchronization signal. The address on the frame generator 550 is a symbol and a frequency index value of the physical channel or the physical channel allocated to the synchronization signal. The address is generated according to the resource allocation method for the physical channels described above.

The synchronization signal generator 540 generates synchronization signal data. Since the sync signal exists only in the non-MBSFN subframe, the sync signal generator 540 operates only when the subframe is non-MBSFN.

The monitoring unit 560 receives the address information allocated to each physical channel and the synchronization signal from the address generator 530, and uses the received information to divide the resource information allocated to the physical channel and the synchronization signal into a two- Can be stored.

The monitoring unit 560 may receive the resource information allocated to the reference signal from the reference signal unit 510 and store the allocated resource information. Preferably, the monitoring unit 560 implements the same number of memory addresses and two-dimensional structure as the frame generating unit 550, and the size of data stored in each memory address of the monitoring unit 560 is 1-bit Can be implemented. That is, the frame generation unit 550 and the monitoring unit 560 are different memories in which the lengths of the horizontal and vertical axes of the two-dimensional memory are the same, and only the data size allocated to each address is different.

For example, when the index value of the REG is (40,56) assigned to the physical channel, the data of the corresponding physical channel is stored in the addresses 40 and 56 in the frame generator 550, , 56 are stored with '1' indicating that resources are allocated.

The resource allocating apparatus 500 of the present invention adds only the monitoring unit 560, which is an additional memory, which is considerably smaller in size than the frame generating unit 550, in comparison with the existing resource allocating apparatus. However, by adding the monitoring unit 560, the resource allocating apparatus 500 individually checks the state where the data is stored in the frame generating unit 550 or collects information on the state of resource allocation in the address generating unit 530 There is an effect that resource allocation can be performed simply and without need.

Therefore, the resource allocation apparatus 500 of the present invention has a simple processor for resource allocation, so that the resource allocation speed is improved as compared with the existing resource allocation apparatus. Also, since the configuration is simple, it is easy to implement the address generator 530 as a hardware, and if the address generator 530 is implemented as hardware, the resource allocation speed can be further improved.

4 is a functional block diagram illustrating a functional block of an address generator of the resource allocation apparatus of the present invention.

4, the address generator of the present invention includes a PCIFCH 531, a PHICH 532, a synchronization signal 533, a PBCH 534, a PDCCH 535, and a PDSCH / PMCH 536 And the like.

The PCIFCH unit 531 to the PDSCH / PMCH unit 536 allocate resources according to the resource allocation method described above and transmit the address value of the frame generator 550 corresponding to the index value of the allocated resource to the frame generator 550).

The PCIFCH unit 531, the PHICH unit 532, the synchronizing signal unit 533, and the PBCH unit 534 are also transmitted to the monitoring unit 560. The monitoring unit 560 stores the address information received from the PCIFCH unit 531, the PHICH unit 532, the synchronizing signal unit 533 and the PBCH unit 534 in a two-dimensional map format, (535) and the PDSCH / PMCH unit (536).

The PCIFCH unit 531 generates an address at which the PCIFCH data is to be stored in the frame generator 550 for resource allocation for the PCIFCH. The PHICH unit 532 generates an address at which the PHICH data is to be stored in the frame generator 550 for resource allocation for the PHICH. The synchronization signal generator 533 generates an address at which the synchronization signal data is stored in the frame generator 550 in order to allocate resources for the synchronization signal. The PBCH generator 534 generates an address at which the PBCH data is stored in the frame generator 550 for resource allocation for the PBCH.

The PDCCH 535 receives the resource allocation information from the monitoring unit 560 and generates an address at which the PDCCH data is stored in the frame generator 550 in order to allocate resources for the PDCCH to an empty resource.

The PDSCH / PMCH unit 536 receives the resource allocation information from the monitoring unit 560 and allocates resources for the PDSCH or the PMCH to the empty resource by setting the address in which the PDSCH or PMCH data is to be stored in the frame generating unit 550 .

5 is a functional block diagram showing all functional blocks of the resource allocation apparatus of the present invention.

5, a resource allocation apparatus 500 according to the present invention includes a reference signal unit 510, a channel data storage unit 520, a frame generation unit 550, an address generation unit 530, a synchronization signal generation unit 540, and a monitoring unit 560. [0050]

The reference signal unit 510 may include a reference signal address generator 511 and a reference signal generator 512.

The reference signal address generator 511 generates an address at which the reference signal data is stored in the frame generator 550 for resource allocation for the reference signal. The reference signal generator 512 generates reference signal data in consideration of the cell characteristics, the subframe characteristics, and the like.

The detailed description of the channel data storage unit 520, the frame generation unit 550, the address generation unit 530, the synchronization signal generation unit 540, and the monitoring unit 560 will be omitted.

6 is a flowchart showing the flow of the resource allocation method of the present invention.

Referring to FIG. 6, the resource allocation method of the present invention includes a control channel mapping step S10, a subframe identification step S20, a first data channel mapping step S30, and a second data channel mapping step S40 And the like.

A resource allocation method of the present invention includes: receiving address information allocated to each physical channel, a reference signal, and a synchronization signal, and storing resource information allocated to a physical channel, a reference signal, and a synchronization signal in a two- And an auxiliary memory for storing the auxiliary memory.

The resource allocation method of the present invention first allocates resources to physical channels that are not affected by allocation status of other channels among control channels. When the resource allocation information is stored in the auxiliary memory and the resource is allocated to the next physical channel, the resource allocated in the previous step is read by reading the auxiliary memory.

In addition, since resources are allocated in the order of data channels in the control channel, the reference signals of the control channel and the data channel are separated and resources are allocated.

Therefore, the resource allocation method of the present invention is characterized in that resources are allocated with priority to each physical channel, a synchronization signal, and a reference signal, and a resource allocation situation is stored in an auxiliary memory.

In the control channel mapping step S10, resources are allocated to the PCFICH, the PHICH, and the PDCCH. When a resource is allocated, the resource allocation information is transferred to the auxiliary memory to store the resource allocation status. Also, a resource is allocated to a reference signal for a control channel before resources are allocated to the channels.

In the subframe determination step S20, it is determined whether the subframe to which resources are to be allocated is an MBSFN. If the subframe is MBSFN, the second data channel mapping step S40 is performed. If the subframe is not MBSFN, the first data channel mapping step S30 is performed.

In the first data channel mapping step S30, resources are allocated to the synchronization signal, the PBCH, the reference signal, and the PDSCH. When resources are allocated to the synchronization signal, the PBCH, and the reference signal, the resource allocation information is stored in the auxiliary memory. The resource allocation for the PDSCH is performed by reading the resource allocation status stored in the auxiliary memory and allocating the empty resources to the PDSCH.

In the second data channel mapping step S40, resources are allocated to the PMCH and PMCH reference signals. When the resource is allocated to the reference signal, the resource allocation information is stored in the auxiliary memory. The resource allocation for the PMCH is performed by reading the resource allocation status stored in the auxiliary memory and allocating the empty resources to the PMCH.

7 is a flowchart showing a flow of a control channel allocation step of the resource allocation method of the present invention.

Referring to FIG. 7, the control channel mapping step S10 of the present invention includes a reference signal mapping step S11, a PCFICH mapping step S12, a PHICH mapping step S13, an auxiliary memory reading step S14, (S15), a resource availability check process (S16), and a PDCCH mapping process (S17).

The control channel region is an area to which PCFICH, PHICH, and PDCCH are allocated, and three channels are allocated resources in REG units. Each REG for each OFDM symbol is changed according to the number of currently set antennas and the cyclic prefix type, and the start position is changed according to the NcellID. In the case where the antennas are 1 and 2, the same is handled.

In the reference signal mapping step S11, the resource is allocated to the reference signal for the control channel. When a resource is allocated to a reference signal, a method of allocating resources is the same when an antenna is 1 and an antenna is 2. The number of REGs allocated to one resource block is 8 when there are one or two antennas and seven when there are four antennas.

A resource is allocated in REG units by storing the reference signal in an address area corresponding to a resource area of the main memory. In addition, resource allocation information is transmitted to the auxiliary memory while the resource is being used as a reference signal.

In the PCFICH mapping process (S12), resources are allocated to the PCFICH. Because PCIFCH is always located in the first OFDM, the l index value is always kept at 0 and the k index value is calculated according to equation (1).

Calculates the corresponding address on the main memory using the index values (k, l) and NcellID, stores the PCFICH data in the main memory, and transmits the resource allocation information to the auxiliary memory.

In the PHICH mapping process (S13), resources are allocated to the PHICH. The PHICH may be mapped into one OFDM symbol or may be mapped to two or three OFDM symbols according to the PHICH length parameter value. For PHICH, the k and l index values are calculated using Equation (2) in the same manner as PCFICH.

Calculates the corresponding address on the main memory using the index values (k, l) and NcellID, stores the PHICH data in the main memory, and transmits the resource allocation information to the auxiliary memory.

In the auxiliary memory reading process (S14), information on resources allocated in the reference signal mapping process (S11), the PCFICH mapping process (S12) and the PHICH mapping process (S13) is received and stored in the auxiliary memory in a two-dimensional map format.

Preferably, the number of memory addresses and the two-dimensional structure of the main memory and the auxiliary memory are the same, and the size of data stored in each memory address of the auxiliary memory is 1-bit. That is, the lengths of the horizontal and vertical axes of the two-dimensional memory are the same in the main memory and the auxiliary memory, and only the data size allocated to each address is different.

In the PDCCH mapping process (S17), resources are allocated to the PDCCH. PDCCH is allocated to an empty REG, not used as PCFICH and PHICH among the OFDM symbols of the control channel region. The detailed resource allocation method has been described above.

However, in order to allocate resources to the PDCCH, the PDCCH needs to know the empty REGs, not the PCFICHs and the PHICHs, among the OFDM symbols in the control channel region.

To this end, in the auxiliary memory reading process (S15), the data value of the address corresponding to the (k, l) index value of the auxiliary memory is read. In the resource use check process (S16), the read data value is checked to determine whether the resource corresponding to the index value (k, l) is a resource allocated or an empty resource.

In the conventional method of calculating the REG address of the PDCCH, when the REG address of the control symbol is given by the setting parameter, the portion mapped to the PCFICH and the PHICH must be excluded. However, according to the present invention, since the flag memory is used to increase the symbol index and the flag index is increased in the direction of increasing the frequency index without complicated calculation, resource allocation can be performed quickly without complicated address calculation.

8 is a flowchart showing a flow of a first data channel mapping step of the resource allocation method of the present invention.

Referring to FIG. 8, the first data channel mapping step S30 of the present invention includes a synchronizing signal mapping step S31, a PBCH mapping step S32, a reference signal mapping step S31, an auxiliary memory writing step S34, An auxiliary memory reading process S35, a resource use checking process S36, and a PDSCH mapping process S37.

In the synchronization signal mapping process S31, resources are allocated to the synchronization signal. The synchronization signal is allocated to the 0th or 5th subframe, and is located in the frequency domain with the DC resource centered at the 6 resource block size. Also, since the synchronization signal is located in the OFDM to which the reference signal is not allocated, the synchronization signal mapping process S31 proceeds sequentially without considering the reference signal.

In the PBCH mapping process (S32), resources are allocated to the PBCH. The PBCH is allocated to the subframe # 0, and is located in the frequency domain with a size of 6RB around the DC in the same manner as the synchronous signal. However, since it is necessary to consider the reference signal unlike the synchronous signal, the number of antennas is assumed to be four and the allocation proceeds. The detailed allocation method is not described above.

The reference signal of the data channel can be selected from one of three types. In the case of transmitting PDSCH first and supporting multiple antennas, a cell-based reference signal is used. When the PMCH is transmitted, the MBSFN reference signal is used. When using a reference signal for a particular UE, a UE based reference signal is used.

Therefore, in the reference signal mapping step S33, resources are allocated to the cell-based reference signal for the data channel.

In the synchronous signal mapping step S31, the PBCH mapping step S32, and the reference signal mapping step S33, the resource allocation information is transmitted to the auxiliary memory.

In the auxiliary memory reading process S34, information on resources allocated in the synchronization signal mapping process S31, the PBCH mapping process S32, and the reference signal mapping process S33 is received and stored in the auxiliary memory in a two-dimensional map format.

In the PDSCH mapping process (S37), resources are allocated to the PDSCH. The PDSCH is allocated for empty REGs among the OFDM symbols in the data channel region, and is allocated to slots 0 and 1 in order. The detailed resource allocation method has been described above.

However, in order to allocate resources to the PDSCH, it is necessary to identify an empty REG.

To this end, in the auxiliary memory reading process (S35), the data value of the address corresponding to the (k, l) index value of the auxiliary memory is read. In the resource use check process (S36), the read data value is checked to determine whether the resource corresponding to the index value (k, l) is a resource allocated or an empty resource.

Since the method of calculating the REG address of the conventional PDSCH needs to exclude the portion mapped to the sync signal, the reference signal, and the PBCH, the comparison operation is performed in order to generate the REG address in advance. However, according to the present invention, since the flag memory is used to increase the symbol index and the flag index is increased in the direction of increasing the frequency index without complicated calculation, resource allocation can be performed quickly without complicated address calculation.

9 is a flowchart illustrating a flow of a second data channel mapping step of the resource allocation method of the present invention.

Referring to FIG. 9, the second data channel mapping step S40 of the present invention includes a reference signal mapping step S41, an auxiliary memory writing step S42, an auxiliary memory reading step S43, a checking step S44, And a mapping process S45.

In the reference signal mapping step S41, a resource is allocated to the MBSFN reference signal for the data channel and the resource allocation information is transmitted to the auxiliary memory.

In the auxiliary memory writing process (S42), the resource allocation information is received in the reference signal mapping process (S41) and stored in the auxiliary memory in a two-dimensional map format.

In the PMCH mapping process (S45), resources are allocated to the PMCH. The PMCH is allocated to an empty REG among the OFDM symbols of the data channel region. The detailed resource allocation method has been described above.

However, in order to allocate resources to the PMCH, it is necessary to identify an empty REG.

To this end, in the auxiliary memory reading process (S43), the data value of the address corresponding to the (k, l) index value of the auxiliary memory is read. In the resource use check process (S44), the read data value is checked to determine whether the resource corresponding to the index value (k, l) is a resource allocated or an empty resource.

Since the method of calculating the REG address of the conventional PMCH must exclude the portion mapped to the reference signal, the comparison operation is performed in order to generate the REG address in advance. However, according to the present invention, since the flag memory is used to increase the symbol index and the flag index is increased in the direction of increasing the frequency index without complicated calculation, resource allocation can be performed quickly without complicated address calculation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. To those skilled in the art.

Claims (15)

An address generator for allocating free resources to a physical channel by referring to resource allocation information stored in a monitoring unit and generating an address value of a frame generator corresponding to a frequency and a symbol index value of the allocated resource;
A frame generator for generating subframe data by storing data to be transmitted through the physical channel in the generated address value;
The monitoring unit storing an address value corresponding to the physical channel generated by the address generating unit;
A reference signal unit for generating data of a reference signal for a control channel and a data channel, allocating resources to the reference signal, and generating an address value of a frame generator corresponding to a frequency and a symbol index value of the allocated resource;
A channel data storage unit for storing precoded data received from the precoder to be transmitted through the control channel and the data channel; And
And a synchronization signal generator for generating a synchronization signal for the data channel.
delete delete 2. The apparatus of claim 1, wherein the frame generator
Receiving the address value and the reference signal data generated in the reference signal unit, storing the data at an address corresponding to the address value,
An address generator for generating an address signal for the synchronous signal generated by the address generator and the synchronous signal data generated by the synchronous signal generator and storing the data at an address corresponding to the address value,
Receiving data in an address value for the control channel and data generated by the address generation unit and in the control channel and data channel stored in the channel data storage unit and storing the data value in an address corresponding to the address value The resource allocation apparatus comprising:
The method according to claim 1,
Wherein the monitoring unit corresponds to the frame generation unit, the number of memory addresses, and the two-dimensional structure, the size of the storage space corresponding to each address of the monitoring unit is 1 bit,
And when the address generating unit allocates the resource, toggles the data of the address of the monitoring unit corresponding to the address of the frame generating unit.
The apparatus of claim 1, wherein the address generator
A PCIFCH unit allocating resources to a physical control indicator channel (PCFICH) and generating an address value of the frame generator corresponding to the index value of the allocated resource;
A PHICH unit allocating a resource to a physical hybrid ARQ indicator channel (PHICH) and generating an address value of the frame generator corresponding to the index value of the allocated resource;
A synchronization signal generator allocating a resource to the synchronization signal and generating an address value of the frame generator corresponding to the index value of the allocated resource;
A PBCH for allocating a resource to a physical broadcast channel (PBCH) and generating an address value of the frame generator corresponding to the index value of the allocated resource;
A PDCCH for assigning a resource to a physical downlink control channel (PDCCH) using resource allocation information stored in the monitoring unit and generating an address value of the frame generator corresponding to an index value of the allocated resource; And
A PDSCH for allocating a resource to a physical downlink share channel (PDSCH) or a physical multicast channel (PMCH) using resource allocation information stored in the monitoring unit and generating an address value of the frame generator corresponding to the index value of the allocated resource, / PMCH group,
Wherein the PCIFCH, the PHICH, the synchronous signal, and the PBCH transmit the generated address to the monitoring unit.
7. The apparatus of claim 6, wherein the address generator
After generating the addresses in the order of the PCIFCH, the PHICH, and the PDCCH,
And generates an address in the order of the synchronous signal, the PBCH, the reference signal, and the PDSCH / PMCH when the subframe is not an MBSFN,
And generates an address in the order of the reference signal part and the PDSCH / PMCH when the subframe is an MBSFN.
A resource allocating device including an auxiliary memory for storing resource information allocated to a physical channel, a reference signal, and a synchronization signal in a two-dimensional map format,
A control channel mapping step of allocating resources to a Physical Control Indicator Channel (PCFICH), a Physical Hybrid ARQ Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH)
A subframe discrimination step of determining whether a subframe to which resources are to be allocated is an MBSFN;
In a case where it is determined that the subframe to which the resource is to be allocated is not an MBSFN in the subframe determination step, a PBCH (Physical Broadcast Channel), a PDSCH (Physical Downlink Share Channel), and a PDSCH A first data channel mapping step of allocating a resource to a reference signal for the first data channel; And
Wherein when a subframe to which the resource is to be allocated is determined to be an MBSFN in the subframe determination step, a second data channel for allocating resources to a PMCH (Physical Multicast Channel) and a reference signal for the PMCH, A method of allocating resources comprising a mapping step.
9. The method of claim 8, wherein the auxiliary memory has the same number of memory addresses and two-dimensional structure as the main memory for storing data of the subframe, and the data length of each address of the auxiliary memory is 1 bit Resource allocation method.
9. The method of claim 8, wherein the step of mapping the control channel
A reference signal mapping step of allocating resources to the reference signal for the control channel and storing resource information allocated to the auxiliary memory;
A PCFICH mapping step of allocating resources to the PCFICH and storing resource information allocated to the auxiliary memory;
A PHICH mapping step of allocating resources to the PHICH and storing resource information allocated to the auxiliary memory;
A resource allocation checking step of checking unallocated resources among the resources of the control channel area using the resource allocation information stored in the auxiliary memory; And
And allocating, to the PDCCH, a resource identified as an unallocated resource among the resources of the control channel region in the resource allocation check process.
11. The method of claim 10, wherein the two-dimensional address values of the sub-memory in which the resource information allocated in the reference signal mapping process, the PCFICH mapping process, and the PHICH mapping process are stored correspond to frequency and symbol index values of the allocated resources, respectively The resource allocation method comprising:
9. The method of claim 8, wherein the first data channel mapping step
A synchronization signal mapping step of allocating resources to the synchronization signal for a data channel and storing resource information allocated to the auxiliary memory;
A PBCH mapping step of allocating resources to the PBCH and storing resource information allocated to the auxiliary memory;
A reference signal mapping process for a PDSCH allocating resources to the reference signal for the PDSCH and storing resource information allocated to the auxiliary memory;
A resource allocation checking step of checking unallocated resources among the resources of the data channel area using the resource allocation information stored in the auxiliary memory; And
And a PDSCH mapping step of allocating, to the PDSCH, a resource identified as an unallocated resource among the resources of the data channel region in the resource allocation check process.
13. The method of claim 12, wherein the two-dimensional address values of the sub-memory in which the resource information allocated in the synchronization signal mapping process, the PBCH mapping process, and the reference signal mapping process for the PDSCH are stored are the frequency and symbol index Quot; value &quot;.&lt; / RTI &gt;
9. The method of claim 8, wherein the second data channel mapping step
A reference signal mapping process for a PMCH that allocates resources to a reference signal for the PMCH and stores resource information allocated to the auxiliary memory;
A resource allocation checking step of checking unallocated resources among resources of a data channel area using the resource allocation information stored in the auxiliary memory; And
And a PMCH mapping step of allocating, to the PMCH, a resource identified as an unallocated resource among the resources of the data channel region in the resource allocation check process.
15. The method as claimed in claim 14, wherein the two-dimensional address values of the sub-memory in which resource information allocated in the reference signal mapping process for the PMCH is stored correspond to frequency and symbol index values of the allocated resources, respectively. Assignment method.

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