JP7084518B2 - Wireless communication methods, wireless communication devices and integrated circuits - Google Patents

Description

The present disclosure relates to the technical field of wireless communication, and more particularly to wireless communication methods, eNodeB (eNB), and user equipment (UE).

Machine-Type Communication (MTC) is a new type of communication in 3GPP Release 12, and is an important source of revenue for carriers. Coverage enhancement techniques are extremely useful in some MTC UEs, such as sensors in basements where signal strength is significantly reduced due to building intrusion loss. For MTCs that use coverage extension, repetition is the basic solution for extending coverage.

“Draft Report of 3GPP TSG RAN WG1 # 80 v0.2.0”

An exemplary embodiment that does not limit the invention provides a method of designing downlink control information (DCI) to a UE that may require coverage enhancement.

In a first general aspect of the present disclosure, a wireless communication method performed by an eNodeB (eNB) comprising transmitting downlink control information (DCI) to a user device (UE), the DCI. Provides a wireless communication method, which is designed based on the coverage expansion level of the UE.

In a second general aspect of the present disclosure, a wireless communication method performed by a user device (UE), the step of receiving downlink control information (DCI) transmitted from the eNodeB (eNB). Including, the DCI provides a wireless communication method, which is designed based on the coverage extension level of the UE.

In the third general aspect of the present disclosure, the eNodeB (eNB) for wireless communication includes a transmission unit that transmits downlink control information (DCI) to a user device (UE). The DCI provides an eNodeB (eNB), which is designed based on the coverage enhancement level of the UE.

In a fourth general aspect of the present disclosure, the user equipment (UE) for wireless communication includes a receiving unit that receives downlink control information (DCI) transmitted from the eNodeB (eNB). The DCI provides a user equipment (UE), which is designed based on the coverage expansion level of the UE.

It should be noted that general or specific embodiments can be implemented as systems, methods, integrated circuits, computer programs, storage media, or any optional combination thereof.

Further benefits and advantages of the disclosed embodiments will be apparent from the specification and drawings. These benefits and / or benefits can be obtained individually by the various embodiments and features herein and in the drawings, and embodiments are made for the purpose of obtaining one or more of such benefits and / or benefits. And it is not necessary to provide all the features.

The above and other features of the present disclosure will be further fully clarified by reading the following description and the accompanying "Claims" with reference to the accompanying drawings. It should be noted that these drawings show only some embodiments according to the present disclosure and therefore these drawings are not considered to limit the scope of the present disclosure. Hereinafter, the present disclosure will be described in more detail and in detail by using the accompanying drawings.

The flow chart of the wireless communication method in eNB which concerns on one Embodiment of this disclosure is shown schematically. A flow chart of a wireless communication method in a UE according to an embodiment of the present disclosure is schematically shown. A block diagram of an eNB for wireless communication according to an embodiment of the present disclosure is shown schematically. A block diagram of a UE for wireless communication according to an embodiment of the present disclosure is shown schematically.

In the following detailed description, reference is made to the accompanying drawings, which form part of the description. In drawings, similar symbols basically represent similar elements, unless the context is inappropriate. It should be noted that the embodiments of the present disclosure may be arranged, replaced, combined and designed in a variety of different structures / configurations, all of which are expressly intended and form part of the present disclosure. It will be easy to understand.

In the present disclosure, MTC (machine type communication) can be understood as an example for explaining the principle of the present disclosure. However, the wireless communication methods disclosed in the present disclosure can be applied not only to MTC, but also to wireless communication other than MTC such as another communication conforming to the LTE specifications. Note that (CE: coverage enhancement) can be applied if it may be required. Thus, the UE is not limited to the MTC UE and can be any other UE capable of performing the communication methods described in the present disclosure.

In the case of wireless communication using coverage extension (eg 15 dB in MTC), the transmitted channel (eg PDSCH (Physical Downlink Shared Channel) or PUSCH (Physical Uplink Shared Channel)) The repetition of) can be a basic solution for extending coverage. The DCI (Downlink Control Information) for channels that use coverage extension may need to indicate resource allocation in both the time domain and the frequency domain. For example, how to design a relatively small DCI for allocating resources for a channel that uses coverage extension becomes an important issue for wireless communication that uses coverage extension.

For example, in the case of MTC UE, the size of DCI is extremely important. This is because the size of the DCI has a large effect on the active time of the UE. The active time means the period during which the RF / baseband of the UE remains operational for the purpose of transmitting or receiving physical signals. Active time reflects the power consumption of the UE and is primarily related to repetition in the time domain. A smaller DCI size may mean that the UE spends less time receiving the DCI. For example, each repetition of a small DCI is transmitted by one ECCE (Enhanced Control Channel Element) (36 REs (Resource Element) per ECCE) and QPSK (Quadrature Phase Shift Keying). Assuming that the code rate is 1/3, and the narrow band is fully occupied (6 PRBs) and the total number of repetitions is 96, the UE receives 4 subs to receive such DCI. It only needs a frame.

However, assuming that each repetition of a larger size DCI is transmitted by one PRB pair, the narrowband is fully occupied, and the total number of repetitions is 96, the UE receives such a DCI. It requires 16 subframes to do. Therefore, it is important to design a smaller size DCI. Moreover, such DCIs can be transmitted with less resources, such as one ECCE instead of one PRB pair.

Furthermore, one ECCE can transmit only 24 bits. That is, assuming that the CRC (Cyclic Redundancy Check) uses 16 bits, it can only support an 8-bit payload size. Therefore, assuming a small resource such as one ECCE to transmit the DCI, the payload size requirement of the DCI is extremely tight. If one or two bits are added, additional ECCE is required to transmit the DCI.

In view of the above, the method of designing a relatively small size DCI for such channels using coverage extension is an important issue in wireless communication using coverage extension.

One embodiment of the present disclosure provides a wireless communication method 100 performed by an eNB, as shown in FIG. FIG. 1 schematically shows a flow chart of a wireless communication method 100 according to an embodiment of the present disclosure. The wireless communication method 100 includes step 101 of transmitting DCI to the UE. In this case, the DCI is designed based on the coverage enhancement level of the UE.

The situation of the UE using CE (coverage extension) may vary depending on the environment, distance to the eNB, building intrusion loss, and the like. Therefore, it may be necessary to consider a plurality of different coverage extension levels (5 dB, 10 dB, 15 dB, etc.) in the wireless communication design. Therefore, the DCI can be designed based on the coverage expansion level of the UE. Note that if any field of DCI (eg, a resource allocation field) is designed based on the coverage extension level, then that DCI is considered to be designed based on the coverage extension level. For example, as will be described in detail later, the resource allocation field in DCI contains an index associated with the coverage extension level. Therefore, such DCIs are considered to be designed based on the level of coverage enhancement.

In one exemplary embodiment, the DCI can use different sizes for different sets of coverage enhancement levels. For example, the coverage extension level can be divided into two sets by comparing the coverage extension level with a predetermined level. If a coverage extension level is greater than a given level, the coverage extension level is considered to be a large coverage extension level and is assigned to a large CE level set. If a coverage extension level is less than a given level, that coverage extension level is considered a small coverage extension level and is assigned to a smaller CE level set. The coverage extension level of the UE can be set by the RRC layer, and the predetermined level can be specified in the standard or set by the RRC layer.

For example, for small coverage enhancement levels, a DCI 26-bit payload size can be used. For large coverage enhancement levels, a DCI 11-bit payload size can be used.

Table 1 shows that two different DCIs (DCI 1 and DCI 2) have been designed for each of the small and large coverage enhancement levels.

In the example of Table 1, DCI 2 for a large CE level is much smaller in size because it does not require many properties such as SRS requirements.

Table 2 shows that DCIs (although different interpretations of the fields differ between different CE levels) are designed for both small and large coverage enhancement levels.

As exemplified in Tables 1 and 2, when DCIs use different sizes for different sets of coverage enhancement levels, DCIs for larger coverage enhancement levels use much fewer bits. Can be done. Note that in this case, the small coverage extension level includes the case without coverage extension.

In addition to, or in lieu of, in one embodiment of the present disclosure, coverage expansion of a channel (eg, PDSCH or PUSCH) scheduled by DCI based on the coverage expansion level is at least a repeat of that channel. It can be realized by repetition in the time domain and / or repetition in the frequency domain, which has a number of repetitions representing the total number of rotations. Also, the resource allocation field in DCI uses one index associated with the number of repetitions to collectively notify the resource allocation in both the time domain and the frequency domain. This embodiment is another exemplary method of designing a DCI based on the coverage expansion level of the UE.

Repetition is an effective way to extend channel coverage. Repeatation can be done in the time domain. For example, multiple subframes can be used to repeat transport blocks. Repeatation can also be done in the frequency domain. For example, multiple PRBs in the frequency domain are used to transmit the transport block. Aggregation in the frequency domain is a method of repetition in the frequency domain. Of course, repetition can also be done in both the time domain and the frequency domain. A DCI that schedules a channel that requires coverage enhancement (eg, PUSCH or PDCCH) may need to indicate resource allocation in both the time domain and the frequency domain. Resource allocation can be indicated in the resource allocation field. The resource allocation field may need to indicate, for example, the number of subframes used for repetition and the number of PRBs in the frequency domain. Optionally, the resource allocation field may also need to indicate the resource location in the frequency domain. The total number of repetitions (number of repetitions) can be the product of the number of subframes in the time domain and the number of PRBs in the frequency domain (unit: PRB pair). For example, 100 repetitions (PRB pairs) can be reflected by 2PRB × 50 subframes (ie, the number of repetitions is 100). Alternatively, the number of repetitions can be set in PRB units. For example, 200 repetitions (PRBs) can be reflected by 2 PRB x 100 slots (50 subframes). In this disclosure, the unit of PRB pair is used to indicate the number of repetitions.

One example of designing a resource allocation field is to individually indicate the time domain and the frequency domain. For example, one field is used to indicate the number of subframes in the time domain, and another field is used to indicate the number and / or position of PRBs in the frequency domain, eg, in a narrow band (6 PRBs). use. Table 3 shows an example of such an individual instruction method.

In the example of Table 3, 2 bits are used to indicate the repetition in the time domain and 3 bits are used to indicate the repetition in the frequency domain. Therefore, a total of 5 bits are required for the resource allocation field. Note that this example only shows the number of PRBs in the frequency domain and does not show the resource location (s) in the frequency domain. The resource location (s) can be set, for example, by the RRC layer or based on the identity information (ID) of the UE.

Table 4 shows another example of the individually indicated method, in which the resource location (s) in the frequency domain is shown.

In the example of Table 4, 2 bits are used to indicate the repetition in the time domain and 5 bits are used to indicate the repetition in the frequency domain. Therefore, a total of 7 bits are required for the resource allocation field.

The advantage of the individually indicated method exemplified in Tables 3 and 4 is the flexibility in resource allocation. However, the problem with this method is that the size of the fields for resource allocation may be relatively large and therefore the size of the DCI as well, for example the UE's active time for receiving PDSCHs is not optimized.

In one embodiment of the present disclosure, we propose a method for collectively notifying resource allocation. That is, the resource allocation field in DCI uses one index associated with the number of repetitions to collectively notify the resource allocation in both the time domain and the frequency domain. It should be noted that one repetition number may correspond to one or more indexes representing one or more specific resource allocation methods for that one repetition number. The method of notifying all at once can reduce the field size for resource allocation. In the example of Table 3, if two additional possible repetition numbers (eg, 6 and 8 repetitions) are added in the time domain, then 5 possible repetition numbers (1 time, 2 times, 4 times) 3 bits are needed to indicate times, 6 times, 8 times). Therefore, when the individually indicated method is used, a total of 6 bits (3 bits for the time domain and 3 bits for the frequency domain) are required. However, when the collective notification method is used, only 5 bits are needed to indicate the number of possible repetitions of 30 (5 in the time domain x 6 in the frequency domain). One bit is saved. These 5 bits constitute an index associated with the number of repetitions. In this embodiment, the transport block size can also be optionally determined by the index associated with the number of repetitions in the resource allocation field. For example, a smaller number of repetitions can indicate a smaller transport block size, and a larger number of repetitions can indicate a larger transport block size.

In a further embodiment, the same number of repetitions is used in the time domain for the same number of repetitions. In other words, for one repetition number, only one combination of the number of repetitions in the time domain and the number of repetitions (the number of PRBs) in the frequency domain is used. For example, assuming that the number of repetitions is 8, resource allocation is 2 PRBs in the frequency domain x 4 subframes in the time domain (simply 2PRB x 4 subframes), or 4PRB x 2 subframes. Can be. However, according to this embodiment, if the number of repetitions is 8, only one possible number of repetitions in the time domain can be used and the UE is aware of it in advance. For example, the number of repetitions in the time domain can be either four subframes or two subframes, and correspondingly the number of repetitions in the frequency domain can be either two PRBs or four PRBs. Can be done. The choice of the number of repetitions in the time domain or the number of repetitions in the frequency domain for each number of repetitions can be set, for example, by the RRC layer or specified in the standard. Therefore, when the UE receives the index corresponding to the number of repetitions, the UE can determine the number of repetitions in the time domain and the number of repetitions in the frequency domain. By doing so, the size of the resource allocation field can be reduced. This is because it is sufficient to show only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain for one number of repetitions. Table 5 shows a specific example of an embodiment in which, under the conditions of Table 3, each number of repetitions has only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain.

In Table 5, each number of repetitions has only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain. Therefore, the resource allocation field requires only 3 bits, which saves 2 bits compared to the method shown in Table 3.

Table 6 shows another specific example of an embodiment in which, under the conditions of Table 4, each number of repetitions has only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain. There is.

In Table 6, each number of repetitions has only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain. Therefore, the resource allocation field requires only 5 bits, saving 2 bits compared to the method shown in Table 4.

Each number of repetitions is the number of repetitions in the time domain and the repetition in the frequency domain, based on the reason that there is little difference in performance between different combinations of the number of repetitions in the time domain and the number of repetitions in the frequency domain. It is reasonable to have only one combination of numbers. For example, in resource allocation, there is almost no difference in performance between 2PRB × 4 subframes and 4PRB × 2 subframes. First, frequency hopping is invalid in "multiple subframes" to perform symbol-level synthesis under the current 3GPP agreement (see Non-Patent Document 1). In other words, within a "multi-subframe", resources should remain in the same position in the frequency domain. The value of the "multi-subframe" can be, for example, 4. Secondly, the total number of repetitions is the same, for example, 2PRB × 4 subframes can realize 8 repetitions, and 4PRB × 2 subframes can also realize 8 repetitions. Therefore, in an embodiment where each number of repetitions has only one combination of the number of repetitions in the time domain and the number of repetitions in the frequency domain, the size of the field for resource allocation is reduced while the performance remains almost unchanged. can do.

In a further embodiment, the lowest possible repetition in the time domain can be assigned to the same value of the number of repetitions. In other words, the repetition in the time domain should be used as few times as possible in order to reduce the active time of the UE and reduce the power consumption of the UE. The active time of the UE is related to the number of repetitions in the time domain. The smaller the number of repetitions in the time domain, the less active time the UE has. For example, when the total number of repetitions is 8, when a narrow band of a total of 6 PRBs in the frequency domain is assumed, the resource allocation of "4 PRB x 2 subframes" should be used according to this embodiment. This is because the repetition of the two subframes in the time domain is the least possible repetition, in which case the UE's active time is minimal. For example, "2PRB x 4 subframe" has many repetitions in the time domain but few repetitions in the frequency domain, and "4PRB x 2 subframes" has many repetitions in the frequency domain but has few repetitions in the time domain. Few. Therefore, the active time of the UE generated by repetition is larger in the case of "2PRB x 4 subframes" than in the case of "4PRB x 2 subframes". In the case of "2PRB x 4 subframes", the UE maintains an active state over four subframes, whereas in the case of "4PRB x 2 subframes", it is only necessary to maintain an active state over two subframes. As a specific example, this embodiment can be applied to Tables 5 and 6.

In a further embodiment, only the appropriate subset of all possible resource positions in the frequency domain are considered as candidate frequency positions for resource allocation for at least one value of the number of repetitions. In other words, only limited resource candidates (rather than all possible resource locations) are maintained in the frequency domain. This is because a large scheduling gain cannot be obtained in a narrow band. By doing so, the size of the resource allocation field can be further reduced. Table 7 is an example of limited resource candidates in the frequency domain under the conditions of Table 6.

In Table 7, when the number of repetitions is 1, only 3 candidates (X1, Y1, Z1) out of 6 candidates are considered (assuming a narrow band), and when the number of repetitions is 2, 5 candidates are considered. Only three of the candidates (X2, Y2, Z2) are considered, and so on. In this example, only 4 bits are needed. Therefore, one bit is further saved compared to Table 6. The set of resource candidates (ie, the appropriate subset of all possible resource locations) can be set by the RRC layer or determined based on the ID of the UE.

The embodiments so far can be used for any uplink channel (eg, PUSCH) or downlink channel (eg, PDSCH) for any expansion level or any number of repetitions. In one example, the embodiments so far are used for downlink channels in the case of small expansion levels or repeat counts. Whether the coverage extension level is large or small can be determined by comparing the coverage extension level with a predetermined level. Predetermined levels can be set by the RRC layer or specified in the standard. In some embodiments, the coverage extension level can also be set by the RRC layer. It should be noted that the above coverage extension level includes the case without expansion, and the number of repetitions includes the case without repetition. For example, the first row in Tables 3-7 represents no repetition.

In a further embodiment, if the coverage extension level is greater than a predetermined level and the channel scheduled by DCI is a downlink channel, then in resource allocation, all possible resources in the frequency domain are allocated. In other words, when the coverage expansion level is large, resources in the frequency domain (eg, 6 PRBs in a narrow band) can be fully occupied in the downlink channel for the purpose of shortening the active time of the UE. Table 8 shows an example of occupying the full frequency resource.

In Table 8, all six narrowband PRBs are occupied in the frequency domain and only 3 bits are required to indicate resource allocation, saving 3 bits compared to the individually indicated method. Further, according to this embodiment, the active time of the UE can be shortened.

In a further embodiment, when the coverage extension level is greater than a predetermined level and the channel scheduled by DCI is an uplink channel, in resource allocation, only one resource in the frequency domain is allocated. By transmitting one PRB in the frequency domain, the maximum power spectral density (PSD: Power Spectral Density) in the uplink can be realized. Optionally, this one resource in the frequency domain can be set by the RRC layer or based on the ID of the UE. Instead, limited resource candidates in the frequency domain can be set for resource allocation of this one resource. Table 9 shows an example of transmitting one PRB in combination with the limitation of resource candidates in the frequency domain.

In Table 9, one PRB transmission and three resource candidates are used in the frequency domain for each of the large uplink repetitions. In other words, only the repetition in the time domain has multiple options (eg, 8 times, 20 times, 40 times, 100 times, etc.). The size of the field for resource allocation is reduced from 6 bits to 5 bits. It should be noted that the set of resource candidates {X, Y, Z} can be set by the RRC layer or determined based on the ID of the UE.

In one embodiment, resource allocation fields can be interpreted based on whether the coverage extension level is large or small. In other words, different sets of coverage enhancement levels can use different designs of resource allocation fields. For example, for a small coverage level, any of Tables 5-7 may be used in interpreting the resource allocation fields, and for a large coverage level, table 8 in the downlink may be used to interpret the resource allocation fields. Table 9 can be used for the uplink. In this example, it is assumed that the UE is aware of the coverage enhancement level in advance for the purpose of deciding which table to use. For example, the UE can recognize this information by setting the RRC.

In another embodiment, if the UE does not recognize the coverage extension level, for example when acquiring a System Information Block (SIB), or during a random access period, all possible repetition numbers are listed in one table. Should be covered in. This is because the coverage extension level is common information that should be used for all UEs. For example, Table 10 shows an exemplary table containing all possible repetitions (from one repetition in the time domain to 1000 repetitions in the time domain). Therefore, the UE can interpret the resource allocation field even if it is not aware of the coverage extension level.

As shown in Table 10, the size of the field for resource allocation is reduced from 6 bits to 5 bits compared to the individually indicated method. Note that Table 10 is only an example of a solution that covers all possible repetitions. The technical features described in other embodiments can also be applied to this solution, which covers all possible repetitions, unless context inadequate.

According to embodiments of the present disclosure, the size of DCI can be reduced. In some embodiments, the active time of the UE can be shortened and / or the PSD (Power Spectral Density) can be increased. It should be noted that the above embodiments can be combined as long as they are not inappropriate due to the context. For example, embodiments with different DCI sizes for different sets of coverage enhancement levels can be combined with any other embodiment.

Further, on the UE side, one embodiment of the present disclosure provides a wireless communication method 200 executed by the UE, as shown in FIG. FIG. 2 schematically shows a flow chart of a wireless communication method 200 according to an embodiment of the present disclosure. This wireless communication method includes step 201 of receiving downlink control information (DCI) transmitted from the eNB. In this case, the DCI is designed based on the coverage expansion level of the UE. It should be noted that the previous description of the wireless communication 100 can also be applied to the wireless communication method 200 (the description is not repeated here).

Further, embodiments of the present disclosure provide eNBs and UEs that perform the communication methods described above. FIG. 3 schematically shows a block diagram of the eNB 300 for wireless communication according to an embodiment of the present disclosure. The eNB 300 may include a transmission unit 301 that transmits downlink control information (DCI) to the UE. In this case, the DCI is designed based on the coverage enhancement level of the UE.

The eNB 300 according to the present disclosure optionally varies depending on the CPU (Central Processing Unit) 310, CPU 310, which processes various data in the eNB 300 and executes related programs for controlling the operation of each unit. ROM (read-only memory) 313 that stores various programs required to execute processes and controls, RAM (random access memory) that stores intermediate data temporarily generated in the process and control procedures by the CPU 310. 315 and / or a storage device 317 for storing various programs or data and the like can be included. The transmitter 301, CPU 310, ROM 313, RAM 315, and / or storage device 317 and the like can be connected to each other via the data and / or instruction bus 320 and can transmit signals between them. ..

Each of the units described above does not limit the scope of the present disclosure. According to one implementation of the present disclosure, the function of the transmitter 301 can be performed by hardware, and the CPU 310, ROM 313, RAM 315, and / or storage device 317 may not be required. .. Alternatively, the function of the transmitter 301 may be performed by functional software in combination with the CPU 310, ROM 313, RAM 315, and / or storage device 317 and the like.

FIG. 4 schematically shows a block diagram of a UE 400 for wireless communication according to an embodiment of the present disclosure. The UE 400 includes a receiving unit that receives downlink control information (DCI) transmitted from the eNB. In this case, the DCI is designed based on the coverage expansion level of the UE.

The UE 400 according to the present disclosure optionally varies depending on the CPU (Central Processing Unit) 410, CPU 410, which processes various data in the UE 400 and executes related programs for controlling the operation of each unit. ROM (read-only memory) 413 that stores various programs required to execute processes and controls, RAM (random access memory) that stores intermediate data temporarily generated in the process and control procedures by the CPU 410. It can include a 415 and / or a storage device 417 that stores various programs, data, and the like. The receiver 401, CPU 410, ROM 413, RAM 415, and / or storage device 417 and the like can be connected to each other via the data and / or instruction bus 420 and can transmit signals between them. ..

Each of the units described above does not limit the scope of the present disclosure. According to one implementation of the present disclosure, the function of the receiver 401 can be performed by hardware, and the CPU 410, ROM 413, RAM 415, and / or storage device 417 may not be required. be. Alternatively, the function of the receiver 401 may be performed by functional software in combination with the CPU 410, ROM 413, RAM 415, and / or storage device 417 and the like.

The above description of this communication method can also be applied to the UE or eNB (the description is not repeated here).

The present disclosure may be carried out by software, by hardware, or by software that works with the hardware. Each functional block used in the description of each embodiment described above can be implemented by an LSI as an integrated circuit, and each process described in each embodiment can be controlled by an LSI. These functional blocks can be individually formed as chips, or one chip can be formed so as to include some or all of the functional blocks. These chips can include a data input / output unit coupled to themselves. The LSI is also referred to as an IC, a system LSI, a super LSI, or an ultra LSI, depending on the degree of integration. However, the technique for implementing an integrated circuit is not limited to LSI, and can be implemented by using a dedicated circuit or a general-purpose processor. Further, an FPGA (field programmable gate array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reset the connection and setting of circuit cells arranged inside the LSI can also be used.

It should be noted that this disclosure is intended to be variously modified or modified by one of ordinary skill in the art without departing from the content and scope of the present disclosure, based on the description and known techniques presented herein. It should be noted that such changes and amendments are within the scope set forth in the "Claims" to be protected. Furthermore, the components of the embodiments described above can be arbitrarily combined without departing from the content of the present disclosure.

The embodiments of the present disclosure can provide at least the following subjects:
1. 1. A wireless communication method executed by eNodeB (eNB).
Including the step of transmitting downlink control information (DCI) to a user device (UE).
DCI is designed based on the coverage expansion level of the UE,
Wireless communication method.
2. 2. Channel coverage expansion scheduled by DCI based on the coverage expansion level is achieved by time domain repetition and / or frequency domain repetition having at least a number of repetitions representing the total number of channel repetitions.
A resource allocation field in DCI uses one index associated with the number of repetitions to collectively inform resource allocation in both the time domain and the frequency domain.
The wireless communication method according to 1.
3. 3. The same number of repetitions is used in the time domain for the same number of repetitions,
The wireless communication method according to 2.
4. The lowest possible repetition in the time domain is assigned to the same value of the number of repetitions.
The wireless communication method according to 2.
5. Only the appropriate subset of all possible resource positions in the frequency domain are considered as candidate frequency positions for resource allocation for at least one value of the number of repetitions.
The wireless communication method according to 2.
6. If the coverage extension level is greater than a given level and the channel scheduled by DCI is a downlink channel, then in resource allocation, all possible resources in the frequency domain are allocated.
The wireless communication method according to 2.
7. If the coverage extension level is greater than a given level and the channel scheduled by DCI is an uplink channel, then in resource allocation, only one resource in the frequency domain is allocated.
The wireless communication method according to 2.
8. One resource in the frequency domain is set by the RRC layer or based on the ID of the UE.
7. The wireless communication method according to 7.
9. If the coverage extension level is less than a given level, the lowest possible repetition in the time domain is assigned to the same number of repetitions.
7. The wireless communication method according to 7.
10. The transport block size is determined by the index associated with the number of repetitions in the resource allocation field.
The wireless communication method according to 2.
11. DCI uses different sizes for different sets of coverage enhancement levels,
The wireless communication method according to 1.
12. A wireless communication method executed by a user device (UE).
Including the step of receiving the downlink control information (DCI) transmitted from the eNodeB (eNB).
DCI is designed based on the coverage expansion level of the UE,
Wireless communication method.
13. Channel coverage expansion scheduled by DCI based on the coverage expansion level is achieved by time domain repetition and / or frequency domain repetition having at least a number of repetitions representing the total number of channel repetitions.
A resource allocation field in DCI uses one index associated with the number of repetitions to collectively inform resource allocation in both the time domain and the frequency domain.
12. The wireless communication method according to 12.
14. The same number of repetitions is used in the time domain for the same number of repetitions,
13. The wireless communication method according to 13.
15. The lowest possible repetition in the time domain is assigned to the same value of the number of repetitions.
13. The wireless communication method according to 13.
16. Only the appropriate subset of all possible resource positions in the frequency domain are considered as candidate frequency positions for resource allocation for at least one value of the number of repetitions.
13. The wireless communication method according to 13.
17. If the coverage extension level is greater than a given level and the channel scheduled by DCI is a downlink channel, then in resource allocation, all possible resources in the frequency domain are allocated.
13. The wireless communication method according to 13.
18. If the coverage extension level is greater than a given level and the channel scheduled by DCI is an uplink channel, then in resource allocation, only one resource in the frequency domain is allocated.
13. The wireless communication method according to 13.
19. One resource in the frequency domain is set by the RRC layer or based on the ID of the UE.
18. The wireless communication method according to 18.
20. If the coverage extension level is less than a given level, the lowest possible repetition in the time domain is assigned to the same number of repetitions.
18. The wireless communication method according to 18.
21. The transport block size is determined by the index associated with the number of repetitions in the resource allocation field.
13. The wireless communication method according to 13.
22. DCI uses different sizes for different sets of coverage enhancement levels,
12. The wireless communication method according to 12.
23. It is an eNodeB (eNB) for wireless communication,
It is equipped with a transmitter that transmits downlink control information (DCI) to a user device (UE).
DCI is designed based on the coverage expansion level of the UE,
eNodeB (eNB).
24. Channel coverage expansion scheduled by DCI based on the coverage expansion level is achieved by time domain repetition and / or frequency domain repetition having at least a number of repetitions representing the total number of channel repetitions.
A resource allocation field in DCI uses one index associated with the number of repetitions to collectively inform resource allocation in both the time domain and the frequency domain.
23. The eNB.
25. For the same number of repetitions, the same number of repetitions in the time domain is used,
24. The eNB.
26. The lowest possible repetition in the time domain is assigned to the same value of the number of repetitions.
24. The eNB.
27. Only the appropriate subset of all possible resource positions in the frequency domain are considered as candidate frequency positions for resource allocation for at least one value of the number of repetitions.
24. The eNB.
28. If the coverage extension level is greater than a given level and the channel scheduled by DCI is a downlink channel, then in resource allocation, all possible resources in the frequency domain are allocated.
24. The eNB.
29. If the coverage extension level is greater than a given level and the channel scheduled by DCI is an uplink channel, then in resource allocation, only one resource in the frequency domain is allocated.
24. The eNB.
30. One resource in the frequency domain is set by the RRC layer or based on the ID of the UE.
29. The eNB.
31. If the coverage extension level is less than a given level, the lowest possible repetition in the time domain is assigned to the same number of repetitions.
29. The eNB.
32. The transport block size is determined by the index associated with the number of repetitions in the resource allocation field.
24. The eNB.
33. DCI uses different sizes for different sets of coverage enhancement levels,
23. The eNB.
34. A user device (UE) for wireless communication
It is equipped with a receiving unit that receives downlink control information (DCI) transmitted from the eNodeB (eNB).
DCI is designed based on the coverage expansion level of the UE,
User equipment (UE).
35. Channel coverage expansion scheduled by DCI based on the coverage expansion level is achieved by time domain repetition and / or frequency domain repetition having at least a number of repetitions representing the total number of channel repetitions.
A resource allocation field in DCI uses one index associated with the number of repetitions to collectively inform resource allocation in both the time domain and the frequency domain.
34. UE.
36. For the same number of repetitions, the same number of repetitions in the time domain is used,
35. UE.
37. The lowest possible repetition in the time domain is assigned to the same value of the number of repetitions.
35. UE.
38. Only the appropriate subset of all possible resource positions in the frequency domain are considered as candidate frequency positions for resource allocation for at least one value of the number of repetitions.
35. UE.
39. If the coverage extension level is greater than a given level and the channel scheduled by DCI is a downlink channel, then in resource allocation, all possible resources in the frequency domain are allocated.
35. UE.
40. If the coverage extension level is greater than a given level and the channel scheduled by DCI is an uplink channel, then in resource allocation, only one resource in the frequency domain is allocated.
35. UE.
41. One resource in the frequency domain is set by the RRC layer or based on the ID of the UE.
40. UE.
42. If the coverage extension level is less than a given level, the lowest possible repetition in the time domain is assigned to the same number of repetitions.
40. UE.
43. The transport block size is determined by the index associated with the number of repetitions in the resource allocation field.
35. UE.
44. DCI uses different sizes for different sets of coverage enhancement levels,
34. UE.

In addition to this, embodiments of the present disclosure further provide an integrated circuit, comprising a module (s) performing (s) steps (s) in each of the above communication methods. be able to. Further, an embodiment of the present disclosure is a computer-readable storage medium in which a computer program including a program code is stored, and when the program code is executed in a computing device, the program code is the communication method described above. A computer-readable storage medium, which performs one or more steps, can be provided.

Claims (9)

A wireless communication method performed by a wireless communication device.
Determine the number of Physical Resource Blocks (PRBs) and the number of repetitions of Physical Downlink Shared channel (PDSCH).
The first downlink control information (DCI) or the second DCI is transmitted , and the format of the first DCI includes all the fields included in the second format and the fields other than the fields, and the first DCI. The frequency domain information field included in the DCI format indicates the number of the PRBs in the narrow band that is part of the total transmission band, and the time domain information field included in the first DCI format is the PDSCH in the time domain. Indicates the number of repetitions,
The first DCI format is used for a first coverage expansion level below the threshold and the second DCI format is used for a second coverage expansion level above the threshold.
The number of bits in the first DCI format is greater than the number of bits in the second DCI format.
Wireless communication method. The frequency domain information field further indicates the position of the PRB in the frequency domain in the narrow band .
The wireless communication method according to claim 1. The narrow band is 6 PRB,
The wireless communication method according to claim 1 . At least one field contained in the second DCI format has a smaller number of bits than the field contained in the first DCI format.
The wireless communication method according to claim 1. A control circuit that determines the number of Physical Resource Blocks (PRBs) and the number of repetitions of Physical Downlink Shared channel (PDSCH),
It has a transmission circuit that transmits a first downlink control information (DCI) or a second DCI , and has.
The first DCI format includes all fields included in the second format and fields other than the fields, and the frequency domain information field included in the first DCI format is a part of the entire transmission band. The number of PRBs in the narrow band is indicated, and the time domain information field included in the first DCI format indicates the number of repetitions of the PDSCH in the time domain.
The first DCI format is used for a first coverage expansion level below the threshold and the second DCI format is used for a second coverage expansion level above the threshold.
The number of bits in the first DCI format is greater than the number of bits in the second DCI format.
Wireless communication device. The frequency domain information field further indicates the position of the PRB in the frequency domain in the narrow band .
The wireless communication device according to claim 5. The narrow band is 6 PRB,
The wireless communication device according to claim 5 . At least one field contained in the second DCI format has a smaller number of bits than the field contained in the first DCI format.
The wireless communication device according to claim 5. The process of determining the number of Physical Resource Blocks (PRB) and the number of repetitions of Physical Downlink Shared channel (PDSCH), and
Controls the process of transmitting the first downlink control information (DCI) or the second DCI ,
The first DCI format includes all fields included in the second format and fields other than the fields, and the frequency domain information field included in the first DCI format is a part of the entire transmission band. The number of PRBs in the narrow band is indicated, and the time domain information field included in the first DCI format indicates the number of repetitions of the PDSCH in the time domain.
The first DCI format is used for a first coverage expansion level below the threshold and the second DCI format is used for a second coverage expansion level above the threshold.
The number of bits in the first DCI format is greater than the number of bits in the second DCI format.
Integrated circuit.

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