KR102016665B1 - Method and apparatus for processing hybrid automatic repeat request process in communication system - Google Patents

Abstract

A method and apparatus for processing a HARQ process in a communication system is disclosed. A method of operating a communication node includes setting up one or more HARQ groups, and placing a HARQ process ID in each of the one or more HARQ groups, wherein each of the one or more HARQ groups is an HARQ memory group, the HARQ A memory controller group for controlling a memory group and a decoder group for decoding data stored in the HARQ memory group by accessing the HARQ memory group through the memory controller group. Therefore, the performance of the communication system can be improved.

Description

Method and apparatus for processing HARQ process in communication system {METHOD AND APPARATUS FOR PROCESSING HYBRID AUTOMATIC REPEAT REQUEST PROCESS IN COMMUNICATION SYSTEM}

The present invention relates to a hybrid automatic repeat request (HARQ) technology in a communication system, and more particularly, to independently process a HARQ process to satisfy the requirements of high data throughput and low latency. It's about technology.

In a communication system, data packets may be transmitted from a transmitter (eg, base station) to a receiver (eg, terminal) via a wireless channel. Errors may occur in data packets received at the receiver depending on the state of the wireless channel (eg, a change in the quality of the wireless channel). Forward error correction (FEC) techniques can be used to recover from received errors. When the FEC technique is used in a communication system, the transmitter may transmit a data packet including redundancy, and the receiver may use the redundancy to recover the error if there is an error in the received data packet. .

In addition, an automatic repeat request (ARQ) technique may be used to recover from a reception error. When ARQ technology is used in a communication system, the transmitter may transmit a data packet including a cyclic redundancy check (CRC), and the receiver may check whether there is an error based on the CRC included in the received data packet. If no error exists in the received data packet, the receiver may send an acknowledgment (ACK) to the transmitter. On the other hand, if there is an error in the received data packet, the receiver may transmit a negative ACK (NACK) to the transmitter. The transmitter receiving the NACK may retransmit the same data packet to the receiver.

In addition, a hybrid ARQ (HARQ) technology, which is a combination of FEC technology and ARQ technology, may be used in a communication system. The HARQ retransmission procedure may be performed based on a chase combining (CC) scheme or an incremental redundancy (IR) scheme. When the HARQ retransmission procedure according to the CC scheme is performed, the transmitter may repeatedly transmit the same data packet. In this case, the receiver can decode the data packet by combining the same data packets received. When the HARQ retransmission procedure according to the IR scheme is performed, the transmitter may transmit data packets having different redundancy versions (RVs). The receiver can decode the data packet by combining the data packets having different RVs received.

Meanwhile, when the HARQ retransmission procedure is performed, a transport block (TB) corresponding to an HARQ process identifier may be stored in an HARQ memory (eg, an HARQ buffer). The size of HARQ memory can be increased to meet the requirements of high data throughput in a communication system. However, when the size of the HARQ memory is increased, low latency requirements may not be satisfied. Thus, there is a need for HARQ techniques to meet high data throughput and low latency requirements.

An object of the present invention for solving the above problems is to provide a method and apparatus for independently processing the HARQ process in a communication system.

A method of operating a first communication node according to a first embodiment of the present invention for achieving the above object comprises the steps of setting up one or more HARQ groups, and placing a HARQ process ID in each of the one or more HARQ groups. Each of the one or more HARQ groups includes a HARQ memory group, a memory controller group for controlling the HARQ memory group, and a decoder for decoding data stored in the HARQ memory group by accessing the HARQ memory group through the memory controller group. An allocation interval of HARQ process IDs including groups and belonging to the one or more identical HARQ groups is greater than or equal to the processing time of one HARQ process. The minimum value of the processing time of the HARQ process may be given as the HARQ memory processing time.

Here, the parameters used to configure the one or more HARQ groups may be received through at least one of an RRC signaling procedure, a system information transmission procedure, and a control information transmission procedure.

Here, the one or more HARQ groups are the total number of the one or more HARQ groups, the total number of HARQ process IDs belonging to the one or more HARQ groups, the total number of decoders belonging to the one or more HARQ groups, the one or more same HARQ It may be set based on the arrangement interval of the group, the HARQ process ID disposed in the one or more HARQ groups and the processing time of the HARQ process.

Here, since the method for arranging HARQ process IDs is numerous, depending on the situation, all of them cannot be explained. Therefore, for ease of description, for example, a description will be made based on a situation in which HARQ performs the most complicated operation. The most complicated situation in terms of HARQ is an environment in which as many as the maximum number of allowable HARQ process IDs are arranged, but NACK occurs in all deployed HARQ process IDs, and thus retransmission management must be performed for all deployed HARQ process IDs. In this situation, since all allowable HARQ process IDs are arranged, modeling a situation in which HARQ process IDs are arranged in a simple increase or decrease form every TTI does not impair the generality of the analysis. Therefore, unless otherwise stated, it will be described based on this. However, this assumption is for ease of description and the present invention is not limited to the above-described assumption only.

Herein, the HARQ processing time is L, the total number of the one or more HARQ groups is K, the allocation interval of HARQ groups is S, the total number of HARQ process IDs is N, and any of N HARQ process IDs. If the number of HARQ process ID of j is j, an embodiment of a method of arranging the HARQ process ID in the HARQ group so as to obtain a batch interval of L TTI or more, HARQ process ID having the same "j mod K" result It may be a form arranged in the same HARQ group. Here, when "N mod K = 0", since the minimum value of the batch interval S of HARQ process IDs belonging to the same HARQ group is K TTI, "min (S) = K" is established and the above assumption " The placement interval S of the HARQ group is greater than or equal to the HARQ processing time L. "K = min (S) ≥ L" may be established under the condition "i.e.," S> L ". Therefore, if the number of HARQ groups (K) is selected so that "K ≥ L" is satisfied, the HARQ process ID may be placed in a specific HARQ group such that the placement interval S of the same HARQ group yields the placement interval of L TTI or more. have.

Here, in the case of "N mod K ≠ 0", it can be operated in various ways.

First, a method of arranging and using a HARQ process ID in a HARQ group may be used in the same manner as the conventional method. In this case, the minimum value of the arrangement interval S of the HARQ group is determined as N mod K. In this case, therefore, K may be selected so that "N mod K ≥ L" is satisfied. Assuming "N mod K = αK (0 <α <1)", K should be selected to satisfy "K> L / α". Since the implementation complexity increases as the number of HARQ groups (K) increases, it is advantageous to keep the value of K as small as possible. Therefore, selecting K so that the value of α as close to 1 as possible can minimize K. It can be seen.

As another method in the case of "N mod K ≠ 0", a method of selecting K such that the α value is as close to 1 as possible can be used. That is, by adding the operation of comparing N mod K to K / 2 in the method of arranging the HARQ process ID in the HARQ group, it is possible to always keep the minimum value of the allocation interval of the HARQ group larger than K / 2. That is, when only the method of arranging the HARQ process ID j in the HARQ group “j mod K” is “0 <α <1”, the operation of further comparing N mod K and K / 2 is further performed. In addition, the HARQ group may be arranged such that "1/2 ≤ α <1" is always maintained.

If "N mod K ≥ K / 2", HARQ process ID #j among N HARQ process IDs may be placed in HARQ group # (j mod K). In this case, the minimum value of the arrangement interval S of the HARQ group is given as "N mod K" and may be K / 2 or more. If "N mod K <K / 2", "floor (N / K) * K" HARQ process IDs #j, which can be grouped by K out of N HARQ process IDs, are placed in HARQ group # (j mod K) And the remaining " N mod K " HARQ process IDs #j can be placed in HARQ group # ((K / 2) + (j mod K)). In this case, the minimum value of the allocation interval of the HARQ group is (K / 2 + (j mod K)) and may always be larger than K / 2. Therefore, in the situation where "N mod K ≠ 0", the minimum value of the arrangement interval S of the HARQ group is greater than or equal to K / 2 for all K, so "min (S) = K / 2" may be established. Accordingly, since "min (S) = K / 2? L" can be established, in this case, the number K of HARQ groups can be selected so that "K? 2L" is satisfied.

Generalizing the methods described above, when N mod K <K / x (x is a natural number of 2 or more), the N mod K remaining HARQ process IDs # j are HARQ group # (K * β + (j mod K) ), β is any real number greater than or equal to 1 / x and the placement interval of the HARQ process can always be greater than or equal to K / x.

Here, the method of grouping the above-described HARQ process ID will be emphasized once again that only one embodiment for ease of description. As described above, since the method for arranging HARQ process IDs can be explained innumerably according to the situation, all of them cannot be explained, and accordingly, HARQ process IDs are simply increased or decreased according to TTI, which is assumed for ease of explanation. One example for obtaining a deployment interval of L TTI or more for each HARQ group in a situation where the form is operated is that a method of grouping HARQ process IDs using a "j mod K" result. The main point is to arrange HARQ process IDs having a batch interval in the same HARQ group according to the situation, and operate HARQ by confirming that the HARQ process ID batch interval S belonging to the same HARQ group is longer than the HARQ processing time L. Is the key. Therefore, if the HARQ process IDs have a batch interval therebetween, the arrangement of HARQ process IDs belonging to the same HARQ group through different forms (for example, different equations, tables, or separate signaling), not based on the "j mod K" result The intervals S can be grouped to be greater than or equal to L TTI.

In sum, the HARQ process ID may be mapped to the HARQ group by the HARQ group mapping function, and thus the HARQ process ID may be grouped. Here, the input of the HARQ group mapping function may be a HARQ process ID and a HARQ process processing time, and the output of the HARQ group mapping function may be a HARQ group. In this case, the placement interval of the HARQ group may be longer than the HARQ process processing time. The above-described embodiment may be an example in which the HARQ group mapping function is "j mod K".

In addition, in all the situations mentioned in the present invention, unless otherwise stated, a method of arranging an appropriately empty TTI during the TTI process to make the placement interval of the HARQ group more than L TTI can be freely used at any time.

Herein, the operation method of the first communication node may include receiving a transport block from a second communication node, performing a demodulation operation on the transport block, performing a demapping operation on the demodulated transport block, And storing the demapped transport block in the HARQ memory group, and performing a decoding operation on the demapped transport block stored in the HARQ memory group.

Here, the demapped transport block may be stored in a HARQ memory group belonging to a HARQ group in which a HARQ process ID of the demapped transport block is disposed.

The performing of the decoding operation may include identifying a HARQ memory group in which the demapped transport block is stored based on an HARQ process ID of the demapped transport block, and demapping from the identified HARQ memory group. The method may further include obtaining a transport block, and performing a decoding operation on the obtained demapped transport block.

A method of operating a first communication node according to a second embodiment of the present invention for achieving the above object comprises the steps of: setting parameters used for setting one or more HARQ groups, and transmitting the parameters to a second communication node. And each of the one or more HARQ groups includes data stored in the HARQ memory group by accessing the HARQ memory group through the HARQ memory group, the memory controller group controlling the HARQ memory group, and the memory controller group. And a decoder group to decode, wherein the parameters include: the total number of one or more HARQ groups, the total number of HARQ process IDs belonging to the one or more HARQ groups, the total number of decoders belonging to the one or more HARQ groups, the one or more Placement interval of the same HARQ group, within the HARQ groups At least one of the HARQ process ID and the processing time of the HARQ process disposed in the.

Here, the parameters may be transmitted through at least one of an RRC signaling procedure, a system information transmission procedure, and a control information transmission procedure.

Here, the arrangement interval of HARQ process IDs belonging to the at least one same HARQ group may be more than a processing time of one HARQ process.

 Here, the HARQ processing time is L, the total number of the one or more HARQ groups is K, the interval of arrangement of HARQ groups is S, the total number of HARQ process IDs is N, any of N HARQ process IDs When the number of HARQ process IDs of j is j, an embodiment of a method of arranging HARQ process IDs in an HARQ group so as to obtain a batch interval of L TTI or more may be based on HARQ process IDs having the same "j mod K" result. It may be a form arranged in the same HARQ group.

A communication node according to a third embodiment of the present invention for achieving the above object includes a processor and a memory in which at least one instruction executed by the processor is stored, the at least one instruction setting up one or more HARQ groups. And place a HARQ process ID in each of the one or more HARQ groups, wherein each of the one or more HARQ groups is through a HARQ memory group, a memory controller group controlling the HARQ memory group and the memory controller group. And a decoder group that decodes the data stored in the HARQ memory group by accessing the HARQ memory group, wherein an allocation interval of HARQ process IDs belonging to the one or more identical HARQ groups is greater than or equal to a processing time of one HARQ process.

Here, the one or more HARQ groups are the total number of the one or more HARQ groups, the total number of HARQ process IDs belonging to the one or more HARQ groups, the total number of decoders belonging to the one or more HARQ groups, the one or more same HARQ It may be set based on the placement interval of the group and the processing time of the HARQ process and the HARQ process ID disposed in the one or more HARQ groups.

 Herein, the HARQ processing time is L, the total number of the one or more HARQ groups is K, the allocation interval of HARQ groups is S, the total number of HARQ process IDs is N, and any of N HARQ process IDs. If the number of HARQ process ID of j is j, an embodiment of a method of arranging the HARQ process ID in the HARQ group so as to obtain a batch interval of L TTI or more, HARQ process ID having the same "j mod K" result It may be a form arranged in the same HARQ group.

 Here, when "N mod K = 0", since the minimum value of the batch interval S of HARQ process IDs belonging to the same HARQ group is K TTI, "min (S) = K" is established and the above assumption " The arrangement interval S of the HARQ group is greater than or equal to the HARQ processing time L. " K = min (S) &gt; L " Therefore, if the number of HARQ groups (K) is selected so that "K ≥ L" is satisfied, the HARQ process ID may be arranged in a specific HARQ group such that the placement interval S of the same HARQ group obtains the placement interval of L TTI or more. have.

Here, in the case of "N mod K ≠ 0", it can be operated in various ways.

First, a method of arranging and using a HARQ process ID in a HARQ group may be used in the same manner as the conventional method. In this case, the minimum value of the arrangement interval S of the HARQ group is determined as N mod K. In this case, therefore, K must be selected so that "N mod K ≥ L" is satisfied. Assuming "N mod K = αK (0 <α <1)", K should be selected to satisfy "K> L / α". Since the implementation complexity increases as the number of HARQ groups (K) increases, it is advantageous to keep the value of K as small as possible. Therefore, selecting K so that the value of α as close to 1 as possible can minimize K. It can be seen.

As another method, a method of selecting K such that α is as close to 1 as possible can be used. That is, by adding the operation of comparing N mod K to K / 2 in the method of arranging the above-described HARQ process ID in the HARQ group, the minimum value of the allocation interval of the HARQ group can always be kept larger than K / 2. That is, when only the method of arranging the HARQ process ID #j in the HARQ group "j mod K" is "0 <α <1", the operation of further comparing N mod K and K / 2 is further performed. In addition, the HARQ group may be arranged such that "1/2 ≤ α <1" is always maintained. If "N mod K ≥ K / 2", HARQ process ID #j among N HARQ process IDs may be placed in HARQ group # (j mod K). In this case, the minimum value of the arrangement interval S of the HARQ group is given as "N mod K" and is K / 2 or more. If "N mod K <K / 2", "floor (N / K) * K" HARQ process IDs #j, which can be grouped by K out of N HARQ process IDs, are placed in HARQ group # (j mod K) And the remaining " N mod K " HARQ process IDs #j can be placed in HARQ group # ((K / 2) + (j mod K)). In this case, the minimum value of the arrangement interval of the HARQ group is (K / 2 + (j mod K)), which is always larger than K / 2. Therefore, in the situation where "N mod K ≠ 0", the minimum value of the arrangement interval S of the HARQ group is greater than K / 2 for all K, so "min (S) = K / 2" is established. Accordingly, since "min (S) = K / 2? L" must be established, in this case, the number K of HARQ groups can be selected so that "K? 2L" is satisfied.

Generalizing the methods described above, when N mod K <K / x (x is a natural number of 2 or more), the N mod K remaining HARQ process IDs # j are HARQ group # (K * β + (j mod K) ), β is any real number greater than or equal to 1 / x and the placement interval of the HARQ process can always be greater than or equal to K / x.

According to the present invention, a HARQ memory storing a transport block corresponding to a hybrid automatic repeat request (HARQ) process identifier may be divided into one or more HARQ memory groups in consideration of the processing time of the corresponding HARQ process. In addition, a memory controller group and a decoder group (or encoder group) corresponding to each of the one or more HARQ memory groups may be set. According to this configuration, since the processing operations of the HARQ processes are performed independently, collisions may not occur between the processing operations of the HARQ processes. Therefore, high data throughput and low latency requirements in a communication system can be satisfied, and the size of the HARQ memory can be relatively reduced. As a result, the performance of the communication system can be improved.

1 is a conceptual diagram illustrating a first embodiment of a communication system.
2 is a block diagram showing a first embodiment of a communication node constituting a communication system.
3 is a block diagram illustrating a first embodiment of a transmission and reception apparatus included in the communication node of FIG. 2.
4 is a block diagram showing a first embodiment of the configuration of the "decoder-memory" in the processing procedure of the HARQ process.
FIG. 5 is a block diagram showing a second embodiment of the configuration of the "decoder-memory" in the processing procedure of the HARQ process.
6 is a timing diagram illustrating a first embodiment of the arrangement of HARQ groups.
7 is a timing diagram illustrating a second embodiment of the arrangement of the HARQ group.
8 is a timing diagram illustrating a third embodiment of the arrangement of the HARQ group.
9 is a timing diagram illustrating a fourth embodiment of the arrangement of the HARQ group.
10 is a timing diagram showing a fifth embodiment of the arrangement of the HARQ group.
11 is a timing diagram illustrating a sixth embodiment of the arrangement of the HARQ group.
12 is a flowchart illustrating a first embodiment of a method of processing a HARQ process.
FIG. 13 is a conceptual diagram illustrating a first embodiment of a configuration of a HARQ group when "N mod K ≠ 0" and "N mod K ≥ K / 2".
14 is a conceptual diagram illustrating a first embodiment of a configuration of a HARQ group when "N mod K ≠ 0" and "N mod K <K / 2".
15 is a block diagram showing a third embodiment of the configuration of the "decoder-memory" in the HARQ process processing procedure.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of one or more related listed items or any of one or more related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include one or more expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

A communication system to which embodiments according to the present invention are applied will be described. The communication system to which the embodiments according to the present invention are applied is not limited to the contents described below, and the embodiments according to the present invention may be applied to various communication systems. Here, the communication system may be used in the same sense as the communication network.

1 is a conceptual diagram illustrating a first embodiment of a communication system.

Referring to FIG. 1, the communication system 100 may include one or more communication nodes 110, 121, 122, 123, 124, 125. In addition, the communication system 100 may include a core network (eg, a serving-gateway (S-GW), a packet data network (PDN) -gateway (P-GW), and a mobility management entity (MME)). It may further include. One or more communication nodes may be 4G communication (eg, long term evolution (LTE), LTE-A (advanced)), 5G communication (eg, new radio (NR)) as defined in the 3rd generation partnership project (3GPP) standard. Communication).

For example, one or more communication nodes may comprise a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a time division multiple access (TDMA) based communication protocol, and a frequency division multiple access (FDMA) based communication protocol. Protocol, orthogonal frequency division multiplexing (OFDM) based communication protocol, Filtered OFDM based communication protocol, orthogonal frequency division multipleaccess (OFDMA) based communication protocol, SC (single carrier) -FDMA based communication protocol, NOMA (Non-orthogonal) Multiple Access (GFDM), generalized frequency division multiplexing (GFDM) based communication protocol, FBMC (filter bank multi-carrier) based communication protocol, UFMC (universal filtered multi-carrier) based communication protocol, SDMA (Space Division Multiple Access) based communication Protocol and so on.

Meanwhile, each of the one or more communication nodes may have a structure as follows.

2 is a block diagram showing a first embodiment of a communication node constituting a communication system.

Referring to FIG. 2, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 that communicates with a network. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

However, each component included in the communication node 200 may be connected through a separate interface or a separate bus around the processor 210, instead of the common bus 270. For example, the processor 210 may be connected to at least one of the memory 220, the transceiver 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

Referring back to FIG. 1, in the communication system 100, the base station 110 may form a macro cell or a small cell and may be connected to the core network through an ideal backhaul or a non-idal backhaul. Can be. The base station 110 may transmit a signal received from the core network to the terminal 121, 122, 123, 124, 125, and transmit the signal received from the terminal 121, 122, 123, 124, 125 to the core network. Can be sent to. One or more of the terminals 121, 122, 123, 124, and 125 may belong to a cell coverage of the base station 110. One or more terminals 121, 122, 123, 124, and 125 may be connected to the base station 110 by performing a connection establishment procedure with the base station 110. One or more terminals 121, 122, 123, 124, and 125 may communicate with the base station 110 after being connected to the base station 110.

In addition, the base station 110 transmits multiple input multiple output (MIMO) transmission (for example, single user (SU) -MIMO, multi user (MI) -MIMO, massive MIMO), CoMP (coordinated multipoint) transmission, It may support CA (carrier aggregation) transmission, transmission in an unlicensed band, device to device communication (D2D) (or ProSe (proximity services)), and the like. Here, each of the one or more terminals 121, 122, 123, 124, and 125 may perform an operation corresponding to the base station 110, an operation supported by the base station 110, and the like.

Here, the base station 110 is a NodeB (NodeB), eNB, gNB, base transceiver station (BTS), radio remote head (RRH), transmission reception point (TRP), radio unit (RU), road side unit (RSU) May be referred to as a radio transceiver, an access point, an access node, or the like. Each of the one or more terminals 121, 122, 123, 124, 125 may be a user equipment (UE), an access terminal, a mobile terminal, a station, a subscriber station, a mobile. It may be referred to as a mobile station, a portable subscriber station, a node, a device, an on-broad unit (OBU), or the like.

Next, independent processing methods of a hybrid automatic repeat request (HARQ) process in a communication system will be described. Even when a method (for example, the transmission or reception of a data packet) is described among the communication nodes, the corresponding second communication node corresponds to the method performed in the first communication node ( For example, reception or transmission of a data packet) may be performed. That is, when the operation of the terminal is described, the base station corresponding thereto may perform an operation corresponding to the operation of the terminal. In contrast, when the operation of the base station is described, the terminal corresponding thereto may perform an operation corresponding to the operation of the base station.

3 is a block diagram showing a first embodiment of a transmission and reception apparatus included in the communication node of FIG. 2, and FIG. 4 shows a first embodiment of the configuration of a "decoder-memory" in a processing procedure of a HARQ process. It is a block diagram.

3 and 4, the transceiver 230 of the communication node 200 may include a transmitter 231, a receiver 233, an antenna 235, and the like. The transmission device 231 includes an encoder 231-1, a mapper 231-3, a modulator 231-5, an inverse fast fourier transform (IFFT) 231-7, and a DAC. (digital-to-analog converter) 231-9 and the like. The results processed by the components 231-1, 231-3, 231-5, 231-7, and 231-9 included in the transmitting device 231 may be stored in the memory 220. The receiver 233 includes a decoder 233-1, a demapper 233-3, a demodulator 233-5, an FFT 233-7, and an ADC (analog-to- digital converters 233-9 and the like. The results processed by the components 233-1, 233-3, 233-5, 233-7, and 233-9 included in the receiving device 233 may be stored in the memory 220.

When the HARQ retransmission procedure is performed, the received data packet may be stored in the HARQ memory 223 for each HARQ process ID. For example, if the HARQ process ID is set for each transport block (TB), the number of HARQ process ID of the transport block # 0 may be set to "0", the HARQ process ID of the transport block # 1 The number may be set to "1", and the number of HARQ process IDs of the transport block # (N-1) may be set to "N-1". Here, N may be an integer of 0 or more.

The HARQ memory 223 may belong to the memory 220 of the communication node 200, and the result processed by the demapper 233-3 may be stored in the HARQ memory 223. The region marked HARQ process ID # 0 in the HARQ memory 223 refers to a region in which a transmission block # 0 corresponding to HARQ process ID # 0 (eg, a log likelihood ratio (LLR) value for the transmission block # 0) is stored. The area indicated by HARQ process ID # 1 in the HARQ memory 223 may indicate an area in which transport block # 1 (eg, an LLR value for transport block # 1) corresponding to HARQ process ID # 1 is stored. The area indicated by HARQ process ID # (N-1) in the HARQ memory 223 may be a transport block # (N-1) corresponding to HARQ process ID # (N-1) (for example, transmission LLR value for block # (N-1)) may indicate an area in which the data is stored.

The decoder 233-1 may be composed of one or more decoders 233-1-0 to 233-1 (M-1). Here, M may be an integer of 0 or more. Each of the one or more decoders 233-1-0 through 233-1- (M-1) may be connected to the HARQ memory 223 via a memory controller 225, and may be HARQ from the HARQ memory 223. A transport block (eg, an LLR value for the transport block) corresponding to the process ID may be obtained, and decoding of the obtained transport block may be performed. The memory controller 225 may be referred to as a "memory arbitrator" or a "memory interface." When one or more memory connection requests are received from one or more decoders 233-1-0 through 233-1- (M-1), the memory controller 225 processes the one or more memory connection requests by sequentially processing the one or more memory connection requests. Each of the decoders 233-1-0 to 233-1- (M-1) may support the HARQ memory 223 at different times.

Meanwhile, when the HARQ retransmission procedure is performed, the operation of the transmitting device 231 may correspond to the operation of the receiving device 233 described above. In this case, the one or more decoders 233-1-0 through 233-1- (M-1) may be one or more encoders, and the HARQ memory 223 may store the result processed by the one or more encoders. have.

Transport blocks corresponding to all HARQ process IDs in the HARQ retransmission procedure may be managed by one HARQ memory 223. In order to meet the requirements of high data throughput and low latency in terms of HARQ memory 223, "high capacity HARQ memory" and "simultaneous access capable HARQ memory" are required. Can be.

The HARQ retransmission procedure may be controlled by the receiver (eg, the reception device 233), and a retransmission operation may be performed for each HARQ process ID (eg, a transport block). As the data throughput increases, the size of the transport block may increase, and accordingly, a large capacity HARQ memory 223 may be required. In addition, when a time division duplex (TDD) type frame is used due to lack of frequency resources, since the bidirectional link may not exist, the number of HARQ process IDs managed in the HARQ retransmission procedure may increase. As a result, a large capacity HARQ memory 223 may be required.

However, since the delay time (for example, the delay time of the HARQ process processing) increases as the size of the HARQ memory 223 increases, it may be difficult to speed up the circuit. In addition, since there is a limit to increasing the clock of the circuit, the requirements of high data throughput and low latency may not be satisfied. In terms of cost, as the size of the HARQ memory 223 increases, the price of the HARQ memory 223 also increases, so that the implementation cost of the circuit may increase.

In addition, a short delay may be required in 5G communication as compared to conventional communication (eg, 4G communication). If the size of the transport block is increased to meet the requirements of high data throughput, the delay time can be increased. In this case, a method of reducing transmission time interval (TTI) duration may be considered to satisfy the requirement of low latency. That is, speeding up the circuit may be necessary to process a transport block having an increased size within a reduced TTI duration. Since there is a limit to the performance improvement due to the high speed of the circuit, a scheme of using one or more decoders 233-1-0 to 233-1- (M-1) configured in parallel may be considered.

Each of the one or more decoders 233-1-0 through 233-1- (M-1) performs a processing operation of the HARQ process (hereinafter referred to as a "HARQ processing operation"), the memory controller 225 Processing of memory access requests that occur at the same time may be necessary for the processing of memory access requests, and the complexity of the memory controller 225 and the cost of the HARQ memory 223 may be increased. If the requests occur simultaneously, conflicts between HARQ memory access requests according to one or more memory access requests may occur in the HARQ memory 223. To resolve this problem, the memory controller 225 may access one or more memory accesses. When there are requests, an arbitration operation may generate one HARQ memory access request corresponding to one memory access request. So as to perform, it can increase the delay time.

That is, a large capacity HARQ memory 223 may be needed to meet the requirements of high data throughput, and one or more decoders (233-1-0 to 233-1- to meet the requirements of low latency). (M-1)) may be needed, and a mediation scheme of memory access requests occurring simultaneously by one or more decoders (233-1-0 through 233-1- (M-1)) may be needed.

FIG. 5 is a block diagram showing a second embodiment of the configuration of the "decoder-memory" in the processing procedure of the HARQ process.

Referring to FIG. 5, one or more HARQ groups (eg, HARQ groups # 0 to # (K-1)) may be set, and each of the one or more HARQ groups may be a HARQ memory group, a memory controller group, and a decoder. It can include a group. The HARQ memory group may store a transport block corresponding to the HARQ process ID, the memory controller group may control the HARQ memory group, and the decoder group may access the HARQ memory group through the memory controller group to transmit stored data in the HARQ memory group. The block can be decoded. For example, HARQ group # 0 may include HARQ memory group # 0, memory controller group # 0, and decoder group # 0, and HARQ group # (K-1) may include HARQ memory group # (K-1), Memory controller group # (K-1) and decoder group # (K-1).

The HARQ group, HARQ memory group, memory controller group and decoder group (or encoder group) may be set based on the following parameters (hereinafter referred to as "HARQ parameters"), and the methods of setting HARQ parameters will be described later. It will be described in detail.

K: total number of HARQ groups configured in a transmitting device or a receiving device

N _k : total number of HARQ process IDs belonging to HARQ group #k (eg, HARQ group # 0 to # (K-1))

N: total number of HARQ process IDs

M _k : total number of decoders (or encoders) belonging to HARQ group #k (eg, HARQ group # 0 to # (K-1))

M: total number of decoders

S: placement interval of HARQ group (in TTI)

HARQ process ID in HARQ group

L: execution time of HARQ processing operation (for example, delay time according to HARQ processing operation) (in TTI unit)

Meanwhile, in order to minimize concurrent memory connection requests, one or more decoders may be set to one decoder group, and a HARQ memory group and a memory controller group for each of the decoder groups may be set. The configuration of the "encoder-memory" may be the same as or similar to the configuration of the "decoder-memory" shown in FIG. For example, the decoder group may correspond to an encoder group of a transmitting device (or an entity group performing an L2 function), and the encoder group may be one or more encoders (eg, entities performing an L2 function). ) May be included.

In FIG. 4, since each of the decoders 233-1-0 to 233-1- (M-1) does not know the HARQ process ID to process, one or more memory connection requests may occur at the same time. On the other hand, in FIG. 5, since the HARQ memory group (for example, HARQ process ID belonging to the same HARQ memory group) that each decoder group is responsible for is set, a physically separated HARQ memory may be configured. For example, a HARQ memory corresponding to a range of HARQ process IDs to be processed by each decoder group may be configured, and each of the decoder groups may independently perform a processing operation of the HARQ process. Thus, conflicts between memory access requests can be minimized.

Further, when the interval of the HARQ process ID belonging to each of the HARQ memory groups is set longer than the execution time of the HARQ processing operation (for example, the delay time of the HARQ processing operation), the HARQ processing operation is independently performed in each of the HARQ groups. As it can be done, the complexity of the memory controller group can be reduced.

■ total number of HARQ groups (K)

In the case of "N mod K = 0", the number K of HARQ groups may be set within a range satisfying the condition 1 below, and in the case of "N mod K ≠ 0", the number K of HARQ groups is It can be set within a range that satisfies condition 2 below.

Condition 1: L ≦ K ≦ M

Condition 2: L * K / (N mod K) ≤ K ≤ M or xL ≤ K ≤ M (x is a natural number of 2 or more)

In addition, the total number of each of the HARQ memory groups, the memory controller groups, and the decoder groups may be equal to the total number of HARQ groups.

■ HARQ  process ID's  Total number (N)

The total number N of HARQ process IDs may be set within a maximum value defined in the specification. For example, when the maximum value of the number of HARQ process IDs is set to 16 in the standard, the total number N of HARQ process IDs may be set to 16 or less. In addition, the total number of HARQ process IDs may be interpreted as the total number of HARQ process IDs arranged to perform HARQ operation.

■ total number of decoders (M)

The total number M of decoders included in the receiving device 233 (or the total number M of encoders included in the transmitting device 231) is the execution time of the HARQ processing operation of the corresponding decoder (or the corresponding encoder). It can be set based on. When the execution time of the HARQ processing operation for processing the data packet according to the maximum transmission amount is "L TTI", M decoders may be configured in the reception apparatus 233. In addition, the minimum period in which the decoder group can be repeated is "L TTI", but since there are K HARQ groups, it is preferable that the decoder group be repeated every "K TTI" if possible, so that the number of decoders belonging to the decoder group #i (M The minimum value of _i ) may be "min (M _i ) = M / K". In general, since the value of min (M _i ) must be maintained at 1 or more so that the HARQ group can be preferably operated, “K ≦ M” can be satisfied here. Since the sum of the number of decoders in each HARQ group is equal to the total number of decoders, "∑ M _i = M" may be satisfied.

■ HARQ  Placement (or Assignment) of Groups

For independent processing of the HARQ process, the HARQ group may be arranged as follows.

6 is a timing diagram illustrating a first embodiment of the arrangement of HARQ groups.

Referring to FIG. 6, the arrangement interval of the same HARQ group may be “0 TTI”, and the HARQ processing operation in the HARQ group # 0 may be performed within one TTI. For example, a processing operation for the HARQ process belonging to the HARQ group # 0 in TTI # 0 and # 1 may be performed. Here, the number of HARQ process ID may be sequentially increased or decreased by one.

7 is a timing diagram illustrating a second embodiment of the arrangement of the HARQ group.

Referring to FIG. 7, the allocation interval of the same HARQ group may be “1 TTI”, and the HARQ processing operation in each of the HARQ groups # 0 and # 1 may be performed within two TTIs. For example, processing operations for HARQ processes belonging to HARQ group # 0 may be performed in TTI # 0 to # 1, and processing operations for HARQ processes belonging to HARQ group # 1 are performed in TTI # 1 to # 2. Can be.

8 is a timing diagram illustrating a third embodiment of the arrangement of the HARQ group.

Referring to FIG. 8, the arrangement interval of the same HARQ group may be “2 TTIs”, and HARQ processing operations in each of the HARQ groups # 0 to # 2 may be performed within three TTIs. For example, a processing operation for the HARQ process belonging to the HARQ group # 0 may be performed in TTI # 0 to # 2, and a processing operation for the HARQ process belonging to the HARQ group # 1 is performed in TTI # 1 to # 3. In the TTI # 2 to # 4, a processing operation for the HARQ process belonging to the HARQ group # 2 may be performed.

In addition, when MIMO-based spatial multiplexing is performed in a communication system, the HARQ group may be set differently for each TB. For example, the HARQ group may be arranged as follows.

9 is a timing diagram illustrating a fourth embodiment of the arrangement of the HARQ group.

Referring to FIG. 9, an allocation interval of the same HARQ group may be “0 TTI”, and different HARQ groups may be set for each TB. For example, a processing operation for the HARQ process belonging to the HARQ group # 0 may be performed in the transport block TB0, and a processing operation for the HARQ process belonging to the HARQ group # 1 in the TB # 1. This can be done.

10 is a timing diagram showing a fifth embodiment of the arrangement of the HARQ group.

Referring to FIG. 10, an allocation interval of the same HARQ group may be “1 TTI”, and different HARQ groups may be set for each TB. For example, a processing operation for the HARQ process belonging to HARQ group # 0 may be performed in TTI # 0 of TB # 0, and HARQ group # 2 in TTI # 1 of TB # 0. The processing operation for the HARQ process belonging to may be performed. A processing operation for the HARQ process belonging to the HARQ group # 1 may be performed in the TTI # 0 of the TB # 1, and the HARQ process belonging to the HARQ group # 3 in the TTI # 1 of the TB # 1. A processing operation on may be performed.

11 is a timing diagram illustrating a sixth embodiment of the arrangement of the HARQ group.

Referring to FIG. 11, an arrangement interval of the same HARQ group may be “2 TTI”, and different HARQ groups may be set for each TB. For example, a processing operation for the HARQ process belonging to the HARQ group # 0 may be performed in TTI # 0 of the transmission block (TB) # 0, and the HARQ group # 2 in the TTI # 1 of the transmission block (TB) # 0. The processing operation for the HARQ process belonging to may be performed, and the processing operation for the HARQ process belonging to the HARQ group # 4 may be performed in TTI # 2 of the transport block (TB) # 0. A processing operation for the HARQ process belonging to the HARQ group # 1 may be performed in TTI # 0 of the TB # 1, and the HARQ process belonging to the HARQ group # 3 in TTI # 1 of the TB # 1. The processing operation may be performed, and the processing operation for the HARQ process belonging to the HARQ group # 5 may be performed in the TTI # 2 of the transport block (TB) # 1.

In addition, when spatial multiplexing is performed, the HARQ group may be implicitly designated for each transport block TB and operate independently even if the HARQ group is configured for each transport block TB. That is, even if the same HARQ group is set for each transport block (TB) in FIGS. 9 to 11, it may be regarded as an independent independent HARQ group and may operate.

When the HARQ group is set for each transport block (TB) in FIGS. 9 to 11, the "decoder-memory" may be configured as shown in FIG. 15. That is, the HARQ memory group, the memory controller group, and the decoder group for each of the transport blocks (TBs) in the HARQ group may be set.

■ HARQ  Placement (or Allocation) of Process IDs

If the number of HARQ groups is K and the number of any HARQ process ID is j, HARQ process IDs having the same "j mod K" result may be set to the same HARQ group (eg, HARQ memory group). . If the number of HARQ process IDs is N and "N mod K = 0", the execution interval of the HARQ processing operation (e.g., the processing operation of the same HARQ process ID) causing the collision is maximized by a multiple of "K TTI". Can be.

On the other hand, in the case of "N mod K ≠ 0", assuming that HARQ process ID #j is placed in HARQ group # (j mod K), "floor (N / K) which can be grouped by K out of N HARQ process IDs ) * K "HARQ process ID #j is placed in HARQ group # (j mod K) and HARQ process ID #j belonging to the last" N mod K "last HARQ group (e.g., TTI without empty TTI If the HARQ process ID is arranged in a simple incremental form each time, the first HARQ group that can be combined again with K) and one of HARQ process ID #j satisfying "floor (j / K) = floor (N / K)" (For example, HARQ process ID #j 'belonging to one of the first K HARQ memory groups) (for example, HARQ process ID #j' satisfying "floor (j '/ K) = 0"). The placement interval of may be "N mod K". In the case of "N mod K K / 2", the HARQ process ID #j may be placed in the HARQ group # (j mod K). In this case, the arrangement interval of the same HARQ group may always be K / 2 or more. That is, when "N mod K ≠ 0" and "N mod K ≥ K / 2", the configuration of the HARQ group may be as shown in FIG. Here, the same HARQ group may be provided for each column.

If "N mod K <K / 2", "floor (N / K) * K" HARQ process IDs #j (for example, # 0 to # (floor ( N / K) * K-1)) may be placed in HARQ group # (j mod K), and the remaining "N mod K" HARQ process IDs #j are HARQ group # ((K / 2) + ( j mod K)). In this case, the minimum value of the batch interval between the remaining "N mod K" HARQ process IDs #j and the HARQ process #j 'belonging to the first HARQ group that can be bundled K again is (K / 2 + ( j mod K)), which is always greater than K / 2. Therefore, in the situation where "N mod K ≠ 0", the minimum value of the arrangement interval S of the HARQ group is greater than K / 2 for all K, so "min (S) = K / 2" is established. Accordingly, since "min (S) = K / 2? L" must be established, in this case, the number K of HARQ groups may be selected to satisfy "K? 2L". That is, when "N mod K ≠ 0" and "N mod K <K / 2", the configuration of the HARQ group may be as shown in FIG. Here, each column may be the same HARQ group. In this case, since the minimum placement interval of the HARQ process ID is K / 2 rather than K, the selection range of K may be reduced. Therefore, it may be advantageous that the total number N of HARQ process IDs is set to a multiple of K.

Generalizing the methods described above, when N mod K <K / x (x is a natural number of 2 or more), the N mod K remaining HARQ process IDs # j are HARQ group # (K * β + (j mod K) ), β is any real number greater than or equal to 1 / x and the placement interval of the HARQ process can always be greater than or equal to K / x.

The placement interval of the HARQ process ID may be set based on methods other than the above described method. The placement interval of the HARQ process ID may be set according to the operating situation of the HARQ retransmission procedure (eg, execution time of the HARQ processing operation of the decoder or encoder). The allocation interval of the HARQ process ID may be larger than the execution time of the HARQ processing operation. Here, the method of grouping the HARQ process IDs will be emphasized once again that only one embodiment for ease of description. As described above, since the method of arranging HARQ process IDs can be explained innumerably according to the situation, all of them cannot be explained. Therefore, HARQ process IDs are simply increased or decreased according to TTI, which is assumed for ease of explanation. One example for obtaining a batch interval of L TTI or more for each HARQ group in a situation of operating as a method is to group HARQ process IDs using a result of "j mod K".

The above situation assumes that the HARQ process ID #j is placed in the TTI #t (t = j), and if there is an empty TTI or does not operate in a sequential increment depending on the situation, the HARQ Process ID #j may be placed in TTI #t (j ≠ t). In this case, it may be necessary to consider the TTI #t together with the HARQ process ID #j in order to obtain the placement interval for each HARQ process ID. In this case, the allocation interval may be determined based on the TTI number #t in the HARQ RTT instead of the HARQ process ID #j, the HARQ group may be configured, and the HARQ process #j disposed in the TTI may be stored. That is, depending on the situation, HARQ process ID #j may be interpreted as HARQ process ID #j 'of the t-th TTI in HARQ RTT.

That is, the point of the present invention is to arrange the HARQ process ID in which the batch interval exists according to the situation in the same HARQ group, and confirm that the HARQ process ID batch interval S belonging to the same HARQ group is longer than the HARQ processing time L. To operate HARQ is key. Therefore, if the HARQ process IDs have a batch interval therebetween, the arrangement of HARQ process IDs belonging to the same HARQ group through different forms (for example, different equations, tables, or separate signaling), not based on the "j mod K" result The intervals S can be grouped to be greater than or equal to L TTI.

In sum, the HARQ process ID may be mapped to the HARQ group by the HARQ group mapping function, and thus the HARQ process ID may be grouped. Here, the input of the HARQ group mapping function may be a HARQ process ID and a HARQ process processing time, and the output of the HARQ group mapping function may be a HARQ group. In this case, the placement interval of the HARQ group may be longer than the HARQ process processing time. The above-described embodiment may be an example in which the HARQ group mapping function is "j mod K". If spatial multiplexing is performed, the number of transport blocks (TB) may be added as an input of the HARQ group mapping function. In addition, when the HARQ group is changed over time, the TTI number may also be added as an input of the HARQ group mapping function.

For example, when "N = 8" and "K = 4", the HARQ process ID in the HARQ group may be set as shown in Table 1 below. When the execution time of the HARQ processing operation is "1 TTI", the allocation interval of HARQ process ID belonging to the same HARQ group may be set to "1 TTI" or more.

■ Execution time (L) of HARQ processing operation

The execution time L of the HARQ processing operation may be set based on the performance of the decoder (or the encoder), the size of the transport block corresponding to the HARQ process ID, the LLR bit width, and the like.

Meanwhile, a method of setting the above-described HARQ parameters (for example, K, N, M, S, HARQ process ID, L, etc. in HARQ group) may be as follows.

Configuration Method # 1: HARQ parameters may be predefined in a specification, and a communication node (eg, a transmitter and a receiver) may set a HARQ group based on the HARQ parameters defined in the specification. Can process the HARQ process based on the HARQ group.

Setting method # 2: "placement interval of HARQ group" and "HARQ process ID in HARQ group" may be signaled to a communication node (eg, a transmitter or a receiver). The communication node may estimate (or calculate) the remaining HARQ parameters (e.g., K, N, M, S) based on the signaled HARQ parameters, the signaled HARQ parameters and the estimated (or HARQ group may be set based on the calculated HARQ parameters, and the HARQ process may be processed based on the set HARQ group. Alternatively, the communication node may set up a HARQ group based on the signaled HARQ parameters and the remaining HARQ parameters defined in the standard, and process the HARQ process based on the set HARQ group.

Setting method # 3: N may be defined in the specification, in which case the communication node may estimate (or calculate) the remaining HARQ parameters (eg, M, K, S, etc.) based on N. has exist. Accordingly, the communication node may set up an HARQ group based on the HARQ parameter defined in the specification and the estimated (or calculated) HARQ parameters, and may process the HARQ process based on the set HARQ group.

Configuration Method # 4: The transmitter transmits at least one of HARQ parameters from at least one of a radio resource control (RRC) signaling procedure, a system procedure transmission procedure, and control information (eg, downlink control information (DCI) transmission procedure). Can inform the receiver via. The receiver may set the HARQ group based on at least one HARQ parameter received from the transmitter and may process the HARQ process based on the set HARQ group. Here, the HARQ parameters can be set by the transmitter.

Setting Method # 5: The receiver may provide information that the transmitter does not know (for example, the number of decoders of the receiver, processing time of the HARQ process, etc.) among the information required for setting up the HARQ group in the transmitter, and the transmitter receives the information received from the receiver. By identifying the configuration of the receiver through the HARQ parameter can be set. The transmitter may selectively inform the receiver of information (eg, HARQ process ID-HARQ group mapping relationship, TTI number-HARQ group mapping relationship, etc.) necessary for the receiver among the set HARQ parameters.

12 is a flowchart illustrating a first embodiment of a method of processing a HARQ process.

Referring to FIG. 12, each of the transmitter and the receiver may be configured identically or similarly to the communication node 200 shown in FIG. 2. In addition, the transmission and reception apparatuses of the transmitter and the receiver may be configured identically or similarly to the transmission and reception apparatus 230 illustrated in FIG. 3. In downlink communication, a transmitter may be a base station and a receiver may be a terminal. In uplink communication, a transmitter may be a terminal and a receiver may be a base station. In D2D communication, the transmitter may be a first terminal and the receiver may be a second terminal.

In step S1200, each of the transmitter and the receiver may set up one or more HARQ groups based on the HARQ parameters. The HARQ parameters may include K, N, M, an interval of placement of the HARQ group, an HARQ process ID in the HARQ group, an execution time of an HARQ processing operation, and the like. HARQ parameters may be set based on the above-described setting methods # 1 to # 4, and the HARQ group may be set the same as or similar to the HARQ group shown in FIG. In addition, in step S1200, HARQ process ID may be allocated (or assigned) to each of the one or more HARQ groups.

The transmitter may transmit a transport block (eg, a data packet) for each HARQ process ID to the receiver (S1210). The receiver may receive a transport block from a transmitter and perform a demodulation operation on the transport block (S1220). In addition, the receiver may perform a demapping operation on the demodulated transport block (S1230) and store the demapped transport block in the HARQ memory group (S1240). Here, the demapped transport block may be an LLR value. The receiver (eg, the demapper 233-3 of the receiver) may determine the HARQ memory group in which the demapped transport block is to be stored based on the HARQ process ID of the demapped transport block. For example, if the number of HARQ process IDs of the demapped transport block falls within 0 to N ₀ -1, the receiver (eg, the demapper 233-3 of the receiver) may assist in the demapped transport block. 5 can be stored in HARQ memory group # 0.

The receiver (eg, the decoder 233-1 of the receiver) may perform a decoding operation on the demapped transport block stored in the HARQ memory group (S1250). For example, the receiver (for example, the decoder 233-1 of the receiver) may check the HARQ memory group in which the de-mapped transport block corresponding to the HARQ process ID to be processed is stored, and the memory is stored in the identified HARQ memory group. By making an access request, a demapped transport block can be obtained from a corresponding HARQ memory group, and a decoding operation can be performed on the obtained demapped transport block. If the number of HARQ process IDs to be processed is within 0 to N ₀ -1, the receiver (for example, the decoder 233-1 of the receiver) may make a memory connection request to the memory controller group # 0 of FIG. 5. By accessing the HARQ memory group # 0 according to the memory access request, a demapped transport block corresponding to the HARQ process ID may be obtained, and a decoding operation may be performed on the obtained demapped transport block.

The methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software.

Examples of computer readable media include hardware devices that are specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (20)

A method of operating a first communication node in a communication system,
Establishing one or more hybrid automatic repeat request (HARQ) groups; And
Disposing a HARQ process identifier (ID) in each of the one or more HARQ groups,
Each of the one or more HARQ groups performs decoding based on data stored in the HARQ memory group by accessing the HARQ memory group through the HARQ memory group, the memory controller group controlling the HARQ memory group, and the memory controller group. Includes a decoder group,
The allocation interval of HARQ process IDs belonging to each of the one or more HARQ groups is more than a processing time of one HARQ process. The method according to claim 1,
The parameters used to set the one or more HARQ groups are received through at least one of a radio resource control (RRC) signaling procedure, a system information transmission procedure, and a control information transmission procedure. The method according to claim 1,
The one or more HARQ groups are established based on the total number of HARQ process IDs, the total number of decoders belonging to the one or more HARQ groups, and the processing time of the HARQ process. The method according to claim 1,
J, L, b, and the number of the HARQ process ID is j, the processing time of the HARQ process is L, the number of transport blocks is b, the transmission time interval (TTI) number is t, and the mapping function is input. and when the HARQ group number is output based on t, the transport blocks of HARQ process ID #j having the same result according to the mapping function are arranged in the same HARQ group. The method according to claim 1,
If the total number of the one or more HARQ groups is K and the number of any HARQ process ID is j, HARQ process ID #j having the same "j mod K" result is placed in the same HARQ group, the first communication node Method of operation. The method according to claim 1,
The total number of the one or more HARQ groups is K, the total number of HARQ process IDs is N, x is a natural number of 2 or more, β is a real number of 1 / x or more and 1 or less, and "N mod K <K / x "N mod K" HARQ process IDs #j excluding "floor (N / K) * K" HARQ process IDs set as HARQ groups among N HARQ process IDs are HARQ group # (K * The method of operation of a first communication node, arranged at β ± (j mod K)). The method according to claim 1,
The operating method of the first communication node,
Receiving a transport block from a second communication node;
Performing a demodulation operation on the transport block;
Performing a demapping operation on the demodulated transport block;
Identifying a HARQ memory group in which the demapped transport block is stored based on an HARQ process ID of the demapped transport block;
Acquiring and combining the demapped transport block from the identified HARQ memory group;
Storing the combined transport block in the HARQ memory group; And
Performing a decoding operation on the combined transport block. The method according to claim 1,
Setting the one or more HARQ groups,
Transmitting allocation interval information for each HARQ group to a second communication node;
Receiving parameters set based on the allocation interval information for each HARQ group from the second communication node; And
Establishing the one or more HARQ groups using the parameters. A method of operating a first communication node in a communication system,
Setting parameters used to set one or more hybrid automatic repeat request (HARQ) groups; And
Sending the parameters to a second communication node,
Each of the one or more HARQ groups is a decoder that decodes data stored in the HARQ memory group by accessing the HARQ memory group through the HARQ memory group, the memory controller group controlling the HARQ memory group and the memory controller group. Contains groups,
The parameters include the total number of one or more HARQ groups, the total number of HARQ process IDs belonging to the one or more HARQ groups, the total number of decoders belonging to the one or more HARQ groups, the spacing interval of the one or more HARQ groups, the one And at least one of a HARQ process ID and a processing time of the HARQ process disposed in the HARQ groups. The method according to claim 9,
The parameters are set based on the placement interval information for each HARQ group received from the second communication node. The method according to claim 9,
The parameters are transmitted via at least one of a radio resource control (RRC) signaling procedure, a system procedure transmission procedure, and a control information transmission procedure. The method according to claim 9,
The allocation interval of HARQ process IDs belonging to each of the one or more HARQ groups is more than a processing time of one HARQ process. The method according to claim 9,
J, L, b, and the number of the HARQ process ID is j, the processing time of the HARQ process is L, the number of transport blocks is b, the transmission time interval (TTI) number is t, and the mapping function is input. and when the HARQ group number is output based on t, the transport blocks of HARQ process ID #j having the same result according to the mapping function are arranged in the same HARQ group. The method according to claim 9,
If the total number of the one or more HARQ groups is K, the total number of HARQ process IDs is N, and the number of any HARQ process IDs among the N HARQ process IDs is j, the same "j mod K" result is obtained. HARQ process ID having is arranged in the same HARQ group, the operation method of the first communication node. The method according to claim 9,
The total number of the one or more HARQ groups is K, the total number of HARQ process IDs is N, x is a natural number of 2 or more, β is a real number of 1 / x or more and 1 or less, and "N mod K <K / x "N mod K" HARQ process IDs #j excluding "floor (N / K) * K" HARQ process IDs set as HARQ groups among N HARQ process IDs are HARQ group # (K * The method of operation of a first communication node, arranged at β ± (j mod K)). As a communication node in a communication system,
A processor; And
A memory storing at least one instruction executed by the processor,
The at least one command is
Establish one or more hybrid automatic repeat request (HARQ) groups; And
Is arranged to place a HARQ process identifier in each of the one or more HARQ groups,
Each of the one or more HARQ groups is a decoder that decodes data stored in the HARQ memory group by accessing the HARQ memory group through the HARQ memory group, the memory controller group controlling the HARQ memory group and the memory controller group. Contains groups,
And a deployment interval of HARQ process IDs belonging to each of the one or more HARQ groups is more than a processing time of one HARQ process. The method according to claim 16,
The one or more HARQ groups are established based on the total number of decoders belonging to the one or more HARQ groups, the processing time of the HARQ process. The method according to claim 16,
J, L, b, and the number of the HARQ process ID is j, the processing time of the HARQ process is L, the number of transport blocks is b, the transmission time interval (TTI) number is t, and the mapping function is input. and when the HARQ group number is output based on t, the transport blocks of HARQ process ID #j having the same result according to the mapping function are arranged in the same HARQ group. The method according to claim 16,
The total number of the one or more HARQ groups is K, the total number of HARQ process IDs is N, x is a natural number of 2 or more, β is a real number of 1 / x or more and 1 or less, and "N mod K <K / x "N mod K" HARQ process IDs #j excluding "floor (N / K) * K" HARQ process IDs set as HARQ groups among N HARQ process IDs are HARQ group # (K * communication node, arranged at β ± (j mod K)). The method according to claim 16,
When setting the one or more HARQ groups, the at least one command is
Send deployment interval information for each HARQ group to a second communication node;
Receive parameters set based on the placement interval information for each HARQ group from the second communication node; And
And to establish the one or more HARQ groups using the parameters.

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