Method for buffer status report, method and apparatus for configuring buffer status report

Abstract

Provided is a method for buffer status reporting, a method and an apparatus for configuring a buffer status report, which is applied to an IAB node, and includes the steps of: generating a buffer status report MAC CE (BSR MAC CE), where the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of logical channel groups is greater than 8; and transmitting the buffer status report MAC CE.

Description

Technical Field

[0001] The present invention relates to the field of communications.

Background Art

[0002] With integrated access and backhaul (IAB) technology, 5G RAN supports wireless relaying. An integrated access and backhaul node (IAB node) supports access and backhaul via new radio (NR). The network-side endpoint of the NR backhaul is referred to as an IAB donor, which represents a network device (such as a gNB) that supports the IAB function. The backhaul may occur via single-hop or multi-hop.

[0003] FIG. 1 is a schematic diagram of one of the overall architectures of IAB. As shown in FIG. 1, the overall architecture of the IAB uses the duplex (SA) mode. FIG. 2 is another schematic diagram of the overall architecture of IAB. As shown in FIG. 2, the overall architecture of the IAB uses the dual connectivity (EN-DC) mode. In the dual connectivity mode, the IAB node is connected to the MeNB via E-UTRA, and the IAB donor terminates the X2-C as the SgNB.

[0004] The IAB-node supports the functions of the gNB-DU (distributed unit). The IAB-node DU is also referred to as the IAB-DU. The IAB-DU is the endpoint of the new radio access (NR access) interface to the terminal device (UE) and the next-hop IAB-node, and is the endpoint of the F1 protocol to the gNB-CU (central unit) in the IAB-donor.

[0005] In addition to the gNB-DU function, the IAB-node supports a part of the UE function called IAB-MT. The IAB-MT includes, for example, physical layer, layer 2, RRC, and NAS functions for connecting to the gNB-DU of other IAB-nodes or IAB-donors, connecting to the gNB-CU at the IAB-donor, and connecting to the core network.

[0006] The IAB-node supports the function of the gNB-DU (Distributed unit), i.e., the IAB-DU. The IAB-DU is the endpoint of the NR radio access interface to the terminal device and the next-hop IAB node, and the endpoint of the F1 protocol to the gNB-CU function at the IAB-donor. Also, the IAB-node supports one subset of the terminal device function (UE function), i.e., the IAB-MT. The IAB-MT includes, for example, physical layer, layer 2 (L2), RRC (Radio Resource Control), and NAS (Non-Access-Stratum) functions for connecting to the gNB-DU of other IAB-nodes or IAB-donors, connecting to the gNB-CU (Centralized Unit) at the IAB-donor, and connecting to the core network.

[0007] The IAB-node is connected to one IAB-donor via single-hop or multi-hop. In the topology, the IAB-donor is the root node, the adjacent node at the IAB-DU interface of the IAB-node is called the descendant node of the IAB-node, i.e., the descendant IAB-node, and the adjacent node at the IAB-MT interface is called the parent node, i.e., the parent IAB-node.

[0008] Note that the above description of the background art is merely for more clearly and completely explaining the configuration of the present invention and is for the purpose of making those skilled in the art understand. It should not be construed that these configurations are well-known technologies to those skilled in the art just because they are described in the background art part of the present invention.

Summary of the Invention

Problems to be Solved by the Invention

[0009] In NR Release 15 and Release 16 (including Release 16 IAB), the Buffer Status Report (BSR) procedure is described in Section 5.4.5 of TS 38.321. The BSR procedure is used to provide the serving gNB with information regarding the uplink data volume within the MAC entity. Each logical channel can be assigned to a logical channel group (LCG), and in Release 15 and Release 16, the maximum number of LCGs is 8.

[0010] Under specific conditions, the UE's MAC entity can trigger a regular BSR, or a padding BSR, or a periodic BSR.

[0011] For different types of BSRs, different BSRs, such as Long BSR, Short BSR, Short Truncated BSR, and Long Truncated BSR, are reported under different conditions.

[0012] For example, regarding the reporting of BSR, it is defined as follows in Section 5.4.5 of TS 38.321.

[0013]

Table 1

[0014] Figure 3 is a schematic diagram of one format of a conventional short BSR MAC CE and a short shortened BSR MAC CE. Figure 4 is a schematic diagram of one format of a conventional long BSR MAC CE, a long shortened BSR MAC CE, and a pre-emptive BSR MAC CE.

[0015] As shown in Figure 3, the lengths of the short BSR MAC CE and the short shortened BSR MAC CE are 1 byte, which is composed of an LCG identifier (LCG ID) field and a buffer size (Buffer Size) field. The LCG ID field is used to identify the logical channel group reported by the buffer status report, and the length of the LCG ID field is 3 bits (bits). The Buffer Size field represents the total amount of data to be transmitted for all logical channels of the logical channel group. The data amount is indicated in bytes, and the length of the Buffer Size field is 5 bits.

[0016] As shown in Figure 4, the maximum number of logical channel groups reported by the buffer status report is 8. The eight LCGi fields constitute 1 byte, the length of each LCGi field is 1 bit, and i ranges from 0 to 7.

[0017] In the case of the long BSR format and the pre-emptive BSR format, the LCGi field indicates whether the Buffer Size field exists for logical channel group i. When the LCGi field is set to 1, it indicates that the Buffer Size field for logical channel group i has been reported. When the LCGi field is set to 0, it indicates that the Buffer Size field for logical channel group i has not been reported.

[0018] In the case of the long shortened BSR format, the LCGi field indicates whether there is data to be transmitted for logical channel group i (data available). When the LCGi field is set to 1, it indicates that there is data to be transmitted for logical channel group i. When the LCGi field is set to 0, it indicates that there is no data to be transmitted for logical channel group i.

[0019] The Buffer Size field is used to identify the total amount of data to be transmitted for all logical channels of one logical channel group after the MAC PDU is constructed, and the amount of data is indicated by the number of bytes. In the case of the short BSR format and the short shortened BSR format, the length of the Buffer Size field is 5 bits. In the case of the long BSR format and the long shortened BSR format, the length of the Buffer Size field is 8 bits.

[0020] According to the discovery of the inventors of the present invention, in R17 IAB, in order to reduce the delay time, the number of LCGs for IAB-MT is increased so that logical channels with different delay time requirements can correspond to different logical channel groups, that is, the LCG is larger than 8. On the other hand, the determination of the BSR reporting format and the MAC CE format in the prior art only support a maximum of 8 LCGs and cannot support the maximum number of LCGs more than that. Therefore, in the prior art, there was a lack of a reporting mechanism for BSR with a maximum number of LCGs more than 8.

[0021] To solve one or more of the above problems, embodiments of the present invention provide a method for buffer status reporting, a method for configuring a buffer status report, and an apparatus.

Means for Solving the Problems

[0022] In a first aspect of an embodiment of the present invention, there is provided an apparatus for buffer status reporting applied to an IAB node, the apparatus including: a first generation unit that generates a buffer status report MAC CE (BSR MAC CE), where the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8; and a first transmission unit that transmits the buffer status report MAC CE.

[0023] In a second aspect of an embodiment of the present invention, there is provided an apparatus for buffer status reporting applied to an IAB node, the apparatus including: a second generation unit that generates a short buffer status report MAC CE when the number of logical channel groups having data to be transmitted does not exceed one, where the short buffer status report MAC CE includes information of the logical channel group and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes; and a second transmission unit that transmits the short buffer status report MAC CE.

[0024] In a third aspect of an embodiment of the present invention, there is provided an apparatus for a buffer status report applied to an IAB node, including a third generation unit that generates a short buffer status report MAC CE (BSR MAC CE) when the number of logical channel groups having data to be transmitted does not exceed N, where the short buffer status report MAC CE includes information on N logical channel groups and at least one buffer size information, and N is an integer greater than or equal to 2; and a third transmission unit that transmits the short buffer status report MAC CE.

[0025] In a fourth aspect of an embodiment of the present invention, there is provided a configuration apparatus for a buffer status report applied to an IAB donor, including a transmission unit that transmits configuration information for a buffer status report to an IAB node, where the configuration information includes at least one of a configured logical channel group ID, the number of configured logical channels (LCHs), a configured BH LCH ID, configuring whether to use an extended LCG range, and configuring whether to use a new format of a buffer status report MAC CE.

[0026] In a fifth aspect of an embodiment of the present invention, there is provided a network apparatus including the apparatus according to any one of the first to fourth aspects of the embodiments of the present invention.

[0027] In a sixth aspect of an embodiment of the present invention, there is provided a communication system including a first network apparatus, a second network apparatus, and a terminal apparatus, where the first network apparatus includes the apparatus according to any one of the first to third aspects of the embodiments of the present invention, and the second network apparatus includes the apparatus according to the fourth aspect of the embodiments of the present invention.

[0028] In a seventh aspect of an embodiment of the present invention, there is provided a method for a buffer status report applied to an IAB node, the method comprising: generating a buffer status report MAC control element (BSR MAC CE), wherein the BSR MAC CE includes information on all logical channel groups having data to be transmitted and at least one buffer size information, and a maximum possible number of the logical channel groups is greater than 8; and transmitting the BSR MAC CE.

[0029] In an eighth aspect of an embodiment of the present invention, there is provided a method for a buffer status report applied to an IAB node, the method comprising: when the number of logical channel groups having data to be transmitted does not exceed one, generating a short buffer status report MAC control element (BSR MAC CE), wherein the short BSR MAC CE includes information on a logical channel group and buffer size information, and a length of the short BSR MAC CE is 2 bytes; and transmitting the short BSR MAC CE.

[0030] In a ninth aspect of an embodiment of the present invention, there is provided a method for a buffer status report applied to an IAB node, the method comprising: when the number of logical channel groups having data to be transmitted does not exceed N, generating a short buffer status report MAC control element (BSR MAC CE), wherein the short BSR MAC CE includes information on N logical channel groups and at least one buffer size information, and N is an integer greater than or equal to 2; and transmitting the short BSR MAC CE.

[0031] In a tenth aspect of an embodiment of the present invention, there is provided a method for configuring a buffer status report applied to an IAB donor, the method including the step of transmitting configuration information for the buffer status report to an IAB node, the configuration information including at least one of a configured logical channel group ID, a number of configured logical channels (LCHs), a configured BH LCH ID, configuring whether to use an extended LCG range, and configuring whether to use a new format of a buffer status report MAC CE.

[0032] In an eleventh aspect of an embodiment of the present invention, there is provided a computer-readable program which, when executed in a buffer status report device or a network device, causes the buffer status report device or the network device to execute the buffer status report method according to the seventh aspect or the eighth aspect or the ninth aspect or the tenth aspect of the embodiment of the present invention.

[0033] In a twelfth aspect of an embodiment of the present invention, there is provided a storage medium storing a computer-readable program which, when executed, causes a buffer status report device or a network device to execute the buffer status report method according to the seventh aspect or the eighth aspect or the ninth aspect or the tenth aspect of the embodiment of the present invention.

[0034] One of the advantageous effects of the embodiments of the present invention is as follows. Without performing the determination operation of the long BSR or short BSR report, generate and transmit a BSR MAC CE including information on all logical channel groups having data to be transmitted and having a maximum possible number greater than 8, and at least one buffer size information, or, when the number of logical channel groups having data to be transmitted does not exceed 1, generate and transmit a short BSR MAC CE including information on the logical channel group and buffer size information and having a length of 2 bytes, or, when the number of logical channel groups having data to be transmitted does not exceed N (N is an integer greater than or equal to 2), generate and transmit a short BSR MAC CE including information on N (N is an integer greater than or equal to 2) logical channel groups and at least one buffer size information. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0035] As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail, and the ways in which the principles of the present invention can be adopted are shown. It should be noted that the scope of the embodiments of the present invention is not limited thereto. The embodiments of the present invention include those that are changed, modified, and equivalent within the gist and scope of the appended claims.

[0036] The features and / or characteristics described or shown in one embodiment may be used in one or more other embodiments in the same or similar manner, may be combined with the features in other embodiments, or may replace the features in other embodiments.

[0037] It should be noted that in this text, the term "including / having" means that a feature, member, step, or component exists and does not exclude the existence or addition of one or more other features, members, steps, or components.

Brief Description of the Drawings

[0038] The elements and features described in one drawing and one embodiment of an example of the present invention may be combined with the elements and features shown in one or more additional drawings or embodiments. Also, in the drawings, like reference numerals indicate corresponding elements in multiple drawings and may indicate corresponding elements used in one or more embodiments.

[0039] The drawings included are used to further understand the examples of the present invention, form part of the specification, are used to illustrate the embodiments of the present invention, and explain the principles of the present invention together with the written description. Note that the drawings described below are merely some examples of the present invention, and those skilled in the art can easily conceive of other drawings based on these drawings.

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Embodiments for Carrying Out the Invention

[0040] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be adopted are shown. It should be noted that the present invention is not limited to the described embodiments. The present invention includes all modified, deformed, and equivalent ones within the scope of the appended claims.

[0041] In the embodiments of the present invention, terms such as "first" and "second" are used to distinguish different elements in the title, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited by these terms. The term "and / or" includes any one and all combinations of one or more of the terms listed in the related list. Terms such as "include", "comprise", and "have" mean the presence of the listed features, elements, elements, or components, but do not exclude the presence or addition of one or more other features, elements, elements, or components.

[0042] In the embodiments of the present invention, the singular forms "one", "the", etc. include the plural forms and should be understood broadly as "one kind" or "one category" and are not limited to "one". Also, the term "the foregoing" should be understood to include both the singular and plural forms unless the context clearly indicates otherwise. Also, unless the context clearly indicates otherwise, the term "described in" should be understood as "described in at least part", and the term "based on" should be understood as "based on at least part".

[0043] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may mean a network that conforms to any communication standard such as, for example, new radio (NR), Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), etc.

[0044] Also, the communication between devices in a communication system may be performed according to a communication protocol at any stage. The communication protocol may include, for example, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and future 5G, New Radio (NR), etc., and / or other currently known or future-developed communication protocols, but is not limited thereto.

[0045] In an embodiment of the present invention, the term "network device" means, for example, a device in a communication system that allows a terminal device to access the communication system and provides services to the terminal device. The network device may include, but is not limited to, a "node" and / or a "donor" based on the IAB architecture, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0046] Among them, the base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a 5G base station (gNB), etc., as well as a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay device, or a low-power node (such as femto, pico, etc.). Also, the term "base station" may include some or all of their functions, and each base station may provide communication coverage for a specific geographical area. The term "cell" may mean a base station and / or its coverage area depending on the context in which the term is used.

[0047] In the embodiments of the present invention, the term "User Equipment" (UE) or the term "Terminal Equipment" (TE) means a device that accesses a communication network via a network device, for example, and receives network services. For example, it is a terminal device served by an IAB node or an IAB donor based on the IAB architecture.

[0048] The terminal device may be fixed or mobile, and may be referred to as a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0049] Among them, the terminal device may include, but is not limited to, a Cellular Phone, a Personal Digital Assistant (PDA), a radio transceiver, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smartwatch, a digital camera, etc.

[0050] For example, in scenarios such as the Internet of Things (IoT), the user device may be a device or apparatus for performing monitoring or measurement. For example, it may include, but is not limited to, a Machine Type Communication (MTC) terminal, a vehicle-mounted communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0051] In the embodiments of the present invention, "when...", "in the case of...", "for the case of...", and "if...", all mean being based on a certain condition or several conditions or states, etc., and these expressions can be replaced with each other.

[0052] The following describes each embodiment of the present invention with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0053] <Example 1> The embodiments of the present invention provide a method for buffer status report, and the method is applied to an IAB node.

[0054] FIG. 5 is a schematic diagram of a method for buffer status report according to Embodiment 1 of the present invention. As shown in FIG. 5, the method includes the following steps.

[0055] Step 501: Generate a buffer status report MAC CE (BSR MAC CE), where the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8.

[0056] Step 502: Transmit the buffer status report MAC CE.

[0057] This enables the provision of an effective BSR reporting mechanism when the maximum number of logical channel groups exceeds eight. Also, by removing the decision-making operations for long BSR or short BSR reports by IAB-MT in existing standards, the operation of IAB-MT can be simplified, and products can be easily realized. Furthermore, the number of newly introduced MAC CEs is small, reducing the occupation of related IDs and alleviating the complexity of system design.

[0058] In an embodiment of the present invention, since an IAB node provides services to a large number of UEs and / or IAB child nodes, 3GPP (registered trademark) agrees in R16 that the maximum number of logical channels (LCHs) supported by one IAB-MT is 2^16 = 65536 (excluding MAC CEs), which is much larger than that of a conventional UE (supporting 32 logical channels and 8 LCGs). Assuming that in R17, the configurable logical channel priority for IAB-MT is still 16 (the values are from 1 to 16), and assuming that the number of hops in the IAB network is usually 4 hops or less, the number of LCGs supported in R17 may be 16 * 4 = 64. However, the present invention is not limited thereto, and the number of LCGs may be an integer power of 2, such as 16, 32, 128, 256, etc. In an embodiment of the present invention, 64 LCGs are taken as an example for explanation.

[0059] In an embodiment of the present invention, the buffer status report MAC CE generated and transmitted by the method of the embodiment of the present invention may also be referred to as a new buffer status report MAC CE (New BSR MAC CE) or an IAB buffer status report MAC CE (IAB BSR MAC CE) or an extended buffer status report MAC CE (Extended BSR MAC CE), etc.

[0060] In step 502, for example, the following operations are performed.

[0061] Regarding the regular BSR (regular BSR) and the periodic BSR (periodic BSR), generate a buffer status report MAC CE that includes information on all logical channel groups having data to be transmitted and buffer size information corresponding to the logical channel groups. The buffer status report MAC CE may further include information on all logical channel groups configured for the IAB-MT or information on all logical channel groups supported by the IAB-MT.

[0062] Regarding the Padding BSR (Padding BSR), when the number of padding bits is greater than or equal to the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and buffer size information corresponding to the logical channel groups, and may further include information on all logical channel groups configured for the IAB-MT or information on all logical channel groups supported by the IAB-MT. When the number of padding bits is less than the total size of the buffer status report MAC CE and its sub-header, the generated buffer status report is a Truncated BSR (Truncated BSR), and the truncated buffer status report MAC CE includes information on logical channel groups having data to be transmitted that does not exceed the number of padding bits and buffer size information corresponding to at least one logical channel group, and may further include information on all logical channel groups configured for the IAB-MT or information on all logical channel groups supported by the IAB-MT. When the number of padding bits is less than the total size of the logical channel group information in the buffer status report MAC CE and the sub-header of the buffer status report MAC CE, no buffer status report MAC CE or truncated buffer status report MAC CE is generated.

[0063] In step 502, the generated buffer status report MAC CE is transmitted to the parent node of the IAB node or the IAB donor.

[0064] The description of the corresponding standard is as follows, for example.

[0065]

Table 2

[0066] For example, the length of the bitmap is 2 bytes or 4 bytes or 8 bytes or 16 bytes or 32 bytes.

[0067] In an embodiment of the present invention, when the maximum number of groups of logical channels is K, the bitmap includes K LCGi fields, the number of bytes of the bitmap may be the smallest integer greater than or equal to K / 8, the length of each LCGi field is 1 bit, K is an integer greater than 8, such as 32, 64, 128, or 256, etc., and i is an integer from 0 to K - 1. Also, the LCGi may be sorted in ascending or descending order of its index i.

[0068] For example, when the maximum number of logical channel groups is 64, the number of bytes of the bitmap is 8.

[0069] In an embodiment of the present invention, the buffer status report MAC CE includes the bitmap, that is, K LCGi fields and m Buffer Size fields, where m is the number of LCGi fields among the K LCGi fields whose value is 1.

[0070] In an embodiment of the present invention, the size of the buffer status report MAC CE is ceil(K / 8)+m bytes.

[0071] In an embodiment of the present invention, in the case of a buffer status report MAC CE or a new buffer status report MAC CE, the LCGi field indicates that the Buffer Size field exists for logical channel group i. When the LCGi field is set to 1, it indicates that the Buffer Size field of logical channel group i has been reported. When the LCGi field is set to 0, it indicates that the Buffer Size field of logical channel group i has not been reported.

[0072] In the case of a shortened buffer status report MAC CE or a new shortened buffer status report MAC CE, the LCGi field indicates whether there is data available to be transmitted for logical channel group i. When the LCGi field is set to 1, it indicates that there is data to be transmitted for logical channel group i. When the LCGi field is set to 0, it indicates that there is no data to be transmitted for logical channel group i.

[0073] FIG. 6 is a schematic diagram of one of the buffer status report MAC CEs of Embodiment 1 of the present invention. As shown in FIG. 6, whether buffer size information corresponding to a logical channel group has been reported or whether there is data to be transmitted for the logical channel group is indicated via an 8-byte bitmap. The maximum number of logical channel groups supported by the bitmap is 64, that is, the bitmap includes 64 LCGi fields of LCG0 to LCG63. Further, the buffer status report MAC CE further includes m Buffer Size fields, where m is the number of LCGi fields with a value of 1 among the 64 LCGi fields, and the size of the MAC CE is m + 8 bytes.

[0074] In an embodiment of the present invention, two logical channel IDs (LCIDs) or one-byte extended logical channel IDs (eLCIDs) may be used to identify whether the first buffer status report MAC CE is a buffer status report MAC CE or a shortened buffer status report MAC CE. The buffer status report MAC CE may be referred to as a new buffer status report MAC CE (New BSR MAC CE), or an IAB buffer status report MAC CE (IAB BSR MAC CE), or an extended buffer status report LCID (Extended BSR MAC CE), etc. The shortened buffer status report MAC CE may be referred to as a new shortened buffer status report MAC CE (New Truncated BSR MAC CE), or an IAB shortened buffer status report MAC CE (IAB Truncated BSR MAC CE), or an extended shortened buffer status report MAC CE (Extended Truncated BSR MAC CE), etc.

[0075] For example, when using two LCIDs for identification, the values of Codepoint and Index are 35 to 44, such as 35 and 36, or 43 and 44, etc.

[0076] Also, for example, when using one eLCID for identification, the value of Codepoint is 0 to 249, such as 248 and 249, and the value of Index is 64 to 313, such as 312 and 313.

[0077] In the above example, the buffer status is reported by the first buffer status report MAC CE. In an embodiment of the present invention, the buffer status report MAC CE also includes at least two second buffer status report MAC CEs.

[0078] In an embodiment of the present invention, the at least two second buffer status report MAC CEs jointly include information of all logical channel groups having data to be transmitted, or information of all configured logical channel groups, or information of all supported logical channel groups. In other words, the at least two second buffer status report MAC CEs jointly report the buffer size information of all logical channel groups having data to be transmitted.

[0079] In this way, when there is a range of logical channel groups having data to be transmitted, the overhead of the buffer status report MAC CE can be saved, and radio resources can be saved.

[0080] In an embodiment of the present invention, the second buffer status report MAC CE may be identified by a logical channel ID (LCID). Also, different second buffer status report MAC CEs may be identified by different logical channel IDs.

[0081] For example, two second buffer status report MAC CEs are used to perform a buffer status report. The first second buffer status report MAC CE reports the buffer size information corresponding to LCG0 to LCG31, and the second second buffer status report MAC CE reports the buffer size information corresponding to LCG32 to LCG63.

[0082] Also, for example, four second buffer status report MAC CEs are used to perform a buffer status report. The first second buffer status report MAC CE reports the buffer size information corresponding to LCG0 to LCG15, the second second buffer status report MAC CE reports the buffer size information corresponding to LCG16 to LCG31, the third second buffer status report MAC CE reports the buffer size information corresponding to LCG32 to LCG47, and the fourth second buffer status report MAC CE reports the buffer size information corresponding to LCG48 to LCG63.

[0083] FIG. 7 is another schematic diagram of the buffer status report MAC CE according to Embodiment 1 of the present invention. As shown in FIG. 7, the buffer status report is performed using two second buffer status report MAC CEs. The first second buffer status report MAC CE reports buffer size information corresponding to LCG0 to LCG31, and the second second buffer status report MAC CE reports buffer size information corresponding to LCG32 to LCG63. For example, if there are LCG0, LCG8, and LCG10 for which data to be transmitted to the IAB-MT exists, the IAB-MT may report only the first second buffer status report MAC CE. Here, the bits corresponding to LCG0, LCG8, and LCG10 are set to 1, and there is a Buffer size field corresponding to LCG0, LCG8, and LCG10. In this way, the signaling overhead of the MAC CE can be saved. If there are LCG0, LCG8, and LCG32 for which data to be transmitted to the IAB-MT exists, the IAB-MT needs to report both the first second buffer status report MAC CE and the second second buffer status report MAC CE. Here, in the first buffer status report MAC CE, there is a Buffer size field corresponding to LCG0 and LCG8, and in the second buffer status report MAC CE, there is a Buffer size field corresponding to LCG32.

[0084] In an embodiment of the present invention, the IAB node may determine the format of the generated buffer status report MAC CE according to specific situations. For example, it may use the format of the buffer status report MAC CE described in Embodiment 1 of the present invention, that is, the format and reporting method of the new buffer status report MAC CE (New BSR MAC CE), or the format and reporting method of the legacy buffer status report MAC CE (legacy BSR MAC CE), for example, the format and reporting method of the buffer status report MAC CE in Release 15 or Release 16. Here, the new buffer status report MAC CE includes the new shortened buffer status report MAC CE.

[0085] In an embodiment of the present invention, as shown in FIG. 5, the method may further include the following steps.

[0086] Step 503: Determine the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT.

[0087] For example, when at least one of the following conditions is satisfied, the buffer status report MAC CE is generated by the method described in Embodiment 1 of the present invention.

[0088] The maximum value of the configured logical channel group ID is greater than the first threshold. The number of configured logical channels (LCHs) is greater than or equal to the second threshold. The configured BH LCH ID adopts an extended LCH ID. The use of an extended LCG range is configured. The use of the new format of the buffer status report MAC CE is configured, and The IAB-MT supports more than eight LCGs.

[0089] For example, when the maximum value of the configured LCG ID is less than or equal to the first threshold, the legacy BSR MAC CE format may be applied. Or, when the maximum value of the configured LCG ID is greater than the first threshold, the new BSR MAC CE format and reporting method may be applied. For example, the first threshold may be an integer such as 8 or 16.

[0090] For example, when the number of configured BH LCHs is less than or equal to the second threshold, the legacy BSR MAC CE format is applied. Or, when the number of configured LCHs is greater than or equal to the second threshold, the new BSR MAC CE format and reporting method are applied.

[0091] For example, when the BH LCH ID (BH-LogicalChannelIdentity) uses the legacy LCH ID (for example, the value range is 1 to 32), the legacy BSR MAC CE format is applied. When the configured BH LCH ID uses the extended LCH ID (for example, the value range is 320 to 65855), the new BSR MAC CE format and reporting method are applied.

[0092] For example, when the network configuration uses an extended LCG range, the new BSR MAC CE format is applied. Or, when the configuration uses the new BSR MAC CE format, the new BSR MAC CE format and reporting method are applied.

[0093] For example, according to the capabilities of the IAB-MT, when the IAB-MT does not support more LCGs than the third threshold, the legacy BSR reporting and BSR MAC CE format are used. When the IAB-MT supports more LCGs than the third threshold, the new BSR MAC CE format and reporting method are applied. For example, the third threshold may be an integer such as 8 or 16 or 64.

[0094] For example, the IAB-MT always applies a new BSR MAC CE format and reporting method.

[0095] In an embodiment of the present invention, the configuration information may be transmitted via RRC signaling such as, for example, an RRC reconfiguration message or an RRC resume message.

[0096] Also, in an embodiment of the present invention, determining the BSR MAC CE format and reporting method based on the configuration information and the capabilities of the IAB-MT may be used alone or in combination.

[0097] Furthermore, in an embodiment of the present invention, a UE served by an IAB node may or may not apply a new BSR MAC CE format.

[0098] Also, in an embodiment of the present invention, a pre-emptive BSR may also apply a new BSR MAC CE format.

[0099] According to this embodiment, without performing the determination operation of long BSR or short BSR reporting, a BSR MAC CE including information on all logical channel groups having data to be transmitted and having a maximum possible number greater than 8 and at least one buffer size information is generated and transmitted. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. Also, by removing the determination operation for long BSR or short BSR reports by IAB-MT in existing standards, the operation of IAB-MT can be simplified and the product can be easily realized. Furthermore, the number of newly introduced MAC CEs is small, the occupation of related IDs can be reduced, and the complexity of system design can be reduced.

[0100] <Example 2> Embodiments of the present invention provide a method for a buffer status report, and the method is applicable to an IAB node.

[0101] In an embodiment of the present invention, it may be determined whether to report a long buffer status report or a short buffer status report based on the number of logical channel groups having data to be transmitted.

[0102] For example, when the number of logical channel groups having data to be transmitted exceeds one, a long buffer status report (long BSR) is reported, and the long buffer status report is also referred to as a new long buffer status report (New long BSR) or an IAB long buffer status report (IAB long BSR) or an extended long buffer status report (Extended long BSR). For the padding BSR, a new long truncated buffer status report (New long Truncated BSR) or an IAB long truncated buffer status report (IAB long Truncated BSR) or an extended long truncated buffer status report (Extended long Truncated BSR) is reported. For the long buffer status report or the long truncated buffer status report, the structure of its MAC CE may be the same as the structure of the buffer status report MAC CE or the short buffer status report MAC CE in Embodiment 1.

[0103] If the number of logical channel groups having data to be transmitted does not exceed one, a short buffer status report (short BSR) is reported, and the short buffer status report is also referred to as a new short buffer status report (New short BSR) or an IAB short buffer status report (IAB short BSR) or an extended short buffer status report (Extended short BSR). For the padding BSR, a new short truncated buffer status report (New short Truncated BSR) or an IAB short truncated buffer status report (IAB short Truncated BSR) or an extended short truncated buffer status report (Extended short Truncated BSR) is reported.

[0104] In other words, for example, for a regular BSR (regular BSR) and a periodic BSR (periodic BSR), a long buffer status report MAC CE or a short buffer status report MAC CE may be generated and transmitted. For the padding BSR (Padding BSR), a long buffer status report MAC CE or a long truncated buffer status report MAC CE or a short truncated buffer status report or a short buffer status report may be generated and transmitted.

[0105] In an embodiment of the present invention, the short buffer status report MAC CE (or a new short buffer status report MAC CE), the short truncated buffer status report MAC CE (or a new short truncated buffer status report MAC CE), the long buffer status report MAC CE (or a new long buffer status report MAC CE), and the long truncated buffer status report MAC CE (or a new long truncated buffer status report MAC CE) are identified by four logical channel IDs (LCIDs) or four one-byte extended logical channel IDs (eLCIDs).

[0106] For example, when identified by four LCIDs, the Codepoint and Index values may be from 35 to 44, for example, from 41 to 44 or from 35 to 38.

[0107] For example, when identified by four 1-byte eLCIDs, for example, the Codepoint value is from 0 to 249, for example, from 246 to 249, and the index value is from 64 to 313, for example, from 310 to 313.

[0108] The following describes the case of reporting a short buffer status report.

[0109] FIG. 8 is a schematic diagram of one method for a buffer status report according to Embodiment 2 of the present invention. As shown in FIG. 8, the method includes the following steps.

[0110] Step 801: When the number of logical channel groups having data to be transmitted does not exceed one, generate a short buffer status report MAC CE, and the short buffer status report MAC CE includes logical channel group information and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes.

[0111] Step 802: Transmit the short buffer status report MAC CE.

[0112] Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0113] In an embodiment of the present invention, the length of the logical channel group information is 4 to 8 bits, that is, the length of the LCG ID field is 4 to 8 bits. Also, the buffer size information, that is, the length of the Buffer Size field, is 1 byte, that is, 8 bits.

[0114] In this way, by increasing the length of the Buffer Size field, a smaller range of buffer values can be indicated by the value (index) of one Buffer Size field, and the accuracy of the Buffer Size field can be improved. Therefore, it is advantageous for the IAB parent node or IAB donor to perform more accurate uplink resource allocation.

[0115] In an embodiment of the present invention, the information of the logical channel group, that is, the LCG ID field, may constitute 1 byte together with reserved bits and may have at least one of the reserved bits.

[0116] For example, the information of the logical channel group, that is, the LCG ID field, may be located before or after the reserved bit, but the embodiments of the present invention do not limit this.

[0117] In an embodiment of the present invention, the information of the logical channel group may be adjacent to the buffer size information.

[0118] In an embodiment of the present invention, the length of the sub-header of the short buffer status report MAC CE is 1 byte, and the length of the MAC sub-PDU including the short buffer status report MAC CE is 3 bytes. In this way, the total number of bytes of the MAC sub-PDU including the short buffer status report MAC CE is small, and the signaling overhead is not large.

[0119] FIG. 9 is a schematic diagram of one of the short buffer status report MAC CEs of Embodiment 2 of the present invention. As shown in FIG. 9, the length of the buffer status report MAC CE is 2 bytes, the length of the LCG ID field is 4 bits, and it constitutes 1 byte together with 4 reserved bits R. The length of the Buffer Size field is 1 byte, that is, 8 bits. Also, the reserved bit R may be located before the LCG ID field.

[0120] Figure 10 is another schematic diagram of the short buffer status report MAC CE according to Embodiment 2 of the present invention. As shown in Figure 10, the length of the buffer status report MAC CE is 2 bytes, the length of the LCG ID field is 6 bits, which together with two reserved bits R constitutes 1 byte, and the length of the Buffer Size field is 1 byte, that is, 8 bits. Also, the reserved bits R may be located before the LCG ID field.

[0121] Figure 11 is yet another schematic diagram of the short buffer status report MAC CE according to Embodiment 2 of the present invention. As shown in Figure 11, the length of the buffer status report MAC CE is 2 bytes, the length of the LCG ID field is 1 byte, that is, 8 bits, and the length of the Buffer Size field is 1 byte, that is, 8 bits.

[0122] Figure 12 is yet another schematic diagram of the short buffer status report MAC CE according to Embodiment 2 of the present invention. As shown in Figure 12, the length of the buffer status report MAC CE is 2 bytes, the length of the LCG ID field is 6 bytes, adjacent to the Buffer Size field, and another Buffer Size field together with two reserved bits constitutes 1 byte, and the total length of the Buffer Size field is 1 byte.

[0123] In the embodiments of the present invention, similar to Embodiment 1, the IAB node may determine the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT. For specific details, reference may be made to the description in Embodiment 1, and the description thereof is omitted here.

[0124] Also, in the embodiments of the present invention, the UE served by the IAB node may or may not apply the new BSR MAC CE format.

[0125] Furthermore, in the embodiments of the present invention, the pre-emptive BSR may also apply the new BSR MAC CE format.

[0126] According to this embodiment, when the number of logical channel groups having data to be transmitted does not exceed 1, a short BSR MAC CE including the information of the logical channel group and the buffer size information and having a length of 2 bytes is generated and transmitted. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. Also, the total number of bytes of the MAC sub-PDU including the short buffer status report MAC CE is small, and the signaling overhead is not large. Furthermore, by increasing the length of the Buffer Size field, a smaller range of buffer values can be indicated by the value (index) of one Buffer Size field, and the accuracy of the Buffer Size field can be improved, which is advantageous for the IAB parent node or the IAB donor to perform more accurate uplink resource allocation.

[0127] <Example 3> The embodiments of the present invention provide a method for buffer status reporting, and the method is applied to an IAB node.

[0128] In the embodiments of the present invention, it may be determined whether to report a long buffer status report or a short buffer status report based on the number of logical channel groups having data to be transmitted.

[0129] For example, when the number of logical channel groups having data to be transmitted exceeds N, a long buffer status report (long BSR) is reported, and the long buffer status report is also referred to as a new long BSR or an IAB long BSR or an extended long BSR. For the padding BSR, a new long truncated BSR or an IAB long truncated BSR or an extended long truncated BSR is reported. For the long buffer status report or the long truncated buffer status report, the structure of its MAC CE may be the same as the structure of the buffer status report MAC CE or the truncated buffer status report MAC CE in Embodiment 1, and N is an integer greater than or equal to 2.

[0130] When the number of logical channel groups having data to be transmitted does not exceed N, a short buffer status report (short BSR) is reported, and the short buffer status report is also referred to as a new short BSR or an IAB short BSR or an extended short BSR. For the padding BSR, a new short truncated BSR or an IAB short truncated BSR or an extended short truncated BSR is reported.

[0131] In other words, for example, for a regular BSR (regular BSR) and a periodic BSR (periodic BSR), a long buffer status report MAC CE or a short buffer status report MAC CE may be generated and transmitted. For a Padding BSR (Padding BSR), a long buffer status report MAC CE or a long-shortened buffer status report MAC CE or a short-shortened buffer status report or a short buffer status report may be generated and transmitted.

[0132] In an embodiment of the present invention, the short buffer status report MAC CE (or a new short buffer status report MAC CE), the short-shortened buffer status report MAC CE (or a new short-shortened buffer status report MAC CE), the long buffer status report MAC CE (or a new long buffer status report MAC CE), and the long-shortened buffer status report MAC CE (or a new long-shortened buffer status report MAC CE) are identified by four logical channel IDs (LCIDs) or four one-byte extended logical channel IDs (eLCIDs).

[0133] For example, when identified by four LCIDs, the values of Codepoint and Index may be 35 to 44, for example 41 to 44 or 35 to 38.

[0134] For example, when identified by four one-byte eLCIDs, for example, the value of Codepoint is 0 to 249, for example 246 to 249, and the value of index is 64 to 313, for example 310 to 313.

[0135] The following describes the case of reporting a short buffer status report.

[0136] FIG. 13 is a schematic diagram of one of the buffer status report methods according to Embodiment 3 of the present invention. As shown in FIG. 13, the method includes the following steps.

[0137] Step 1301: If the number of logical channel groups having data to be transmitted does not exceed N, generate a short buffer status report MAC CE (BSR MAC CE), where the short buffer status report MAC CE includes information on N logical channel groups and at least one buffer size information, and N is an integer greater than or equal to 2.

[0138] Step 1302: Transmit the short buffer status report MAC CE.

[0139] In this way, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0140] Also, as a relay node in the network, the IAB node usually serves many UEs and / or IAB child nodes. Therefore, the IAB-MT usually has data to be transmitted to two or more logical channel groups, but in some cases, there is only data to be transmitted to a small number of logical channel groups. In this case, by adopting the short buffer status report MAC CE format in this embodiment, the signaling overhead can be reduced and radio resources can be saved compared with the case of transmitting a long buffer status report MAC CE.

[0141] In an embodiment of the present invention, the length of the information of each logical channel group is 4 to 8 bits.

[0142] In an embodiment of the present invention, the information on at least N logical channel groups, that is, the LCGi field, is located in the same byte or different bytes, where i is from 0 to N - 1, or it may be referred to as the LCG ID field and is represented as LCG ID a, LCG ID b,....

[0143] In an embodiment of the present invention, in the short buffer status report MAC CE or the new short buffer status report MAC CE or the short shortened buffer status report MAC CE or the new short shortened buffer status report MAC CE, information of at least one logical channel group among the information of the at least N logical channel groups is adjacent to its corresponding buffer size information, and / or information of at least two logical channel groups among the information of the at least N logical channel groups is adjacent, and / or at least two buffer size information, that is, the Buffer size fields are adjacent.

[0144] In an embodiment of the present invention, the LCG ID field may be arranged before each byte, or may be arranged adjacent to the corresponding buffer size. When the LCG ID field is arranged at the head, the order in the buffer size field of the buffer size corresponding to the LCG is the same as the order in the LCG ID field of this LCG.

[0145] For example, when N is 2, the description of the relevant standard may be as follows.

[0146] [Table 3] The following exemplarily describes the format of the short buffer status report MAC CE when N is 2. When N is greater than 2, it is the same as when N is 2.

[0147] FIG. 14 is a schematic diagram of one of the short buffer status report MAC CEs according to Embodiment 3 of the present invention. As shown in FIG. 14, the length of the buffer status report MAC CE is 3 bytes, and includes an LCG ID field which is information of two logical channel groups, and a Buffer size field which is information of two buffer sizes. The two LCG ID fields are LCG ID a and LCG ID b respectively, and their lengths are both 4 bits. LCG ID a and LCG ID b constitute 1 byte. The Buffer size 1 field includes buffer size information corresponding to LCG ID a, and the Buffer size 2 field includes buffer size information corresponding to LCG ID b.

[0148] FIG. 15 is another schematic diagram of the short buffer status report MAC CE according to Embodiment 3 of the present invention. As shown in FIG. 15, the length of the buffer status report MAC CE is 3 bytes, and includes an LCG ID field which is information of two logical channel groups, and a Buffer size field which is information of two buffer sizes. The two LCG ID fields are LCG ID a and LCG ID b respectively, and their lengths are both 6 bits. A part of LCG ID a and the first Buffer size field constitute the first byte, another part of the first Buffer size field and a part of LCG ID b constitute the second byte, another part of LCG ID b and the second buffer size field constitute the third byte. The Buffer size 1 field includes buffer size information corresponding to LCG ID a, and the Buffer size 2 field includes buffer size information corresponding to LCG ID b.

[0149] FIG. 16 is another schematic diagram of the short buffer status report MAC CE according to Embodiment 3 of the present invention. As shown in FIG. 16, the length of the buffer status report MAC CE is 3 bytes, including an LCG ID field which is information of two logical channel groups and a Buffer size field which is information of two buffer sizes. The two LCG ID fields are LCG ID a and LCG ID b respectively, both of which have a length of 1 byte, i.e., 8 bits, and the lengths of the two Buffer size fields are also both 1 byte, i.e., 8 bits. The Buffer size 1 field contains buffer size information corresponding to LCG ID a, and the Buffer size 2 field contains buffer size information corresponding to LCG ID b.

[0150] In an embodiment of the present invention, when N is 8, the information of the eight logical channel groups included in the short buffer status report MAC CE constitutes 1 byte. That is, the short buffer status report MAC CE may adopt the format of the existing long buffer status report MAC CE.

[0151] FIG. 17 is another schematic diagram of the short buffer status report MAC CE according to Embodiment 3 of the present invention. As shown in FIG. 17, the maximum number of logical channel groups of the buffer status report is 8, and the eight LCGi fields constitute 1 byte, and the length of each LCGi field is 1 bit, where i ranges from 0 to 7.

[0152] In an embodiment of the present invention, similar to Embodiment 1, the IAB node may determine the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT. For specific content, reference may be made to the description in Embodiment 1, and the description thereof is omitted here.

[0153] In addition, in the embodiments of the present invention, the UE served by the IAB node may or may not apply the new BSR MAC CE format.

[0154] Furthermore, in the embodiments of the present invention, the pre-emptive BSR may also apply the new BSR MAC CE format.

[0155] According to this embodiment, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. Also, as a relay node in the network, the IAB node usually serves many UEs and / or IAB child nodes. Therefore, the IAB-MT usually has data to be transmitted to two or more logical channel groups, but in some cases, there is only data to be transmitted to a small number of logical channel groups. In this case, by adopting the short buffer status report MAC CE format in this embodiment, the signaling overhead can be reduced and radio resources can be saved compared with the case of transmitting the long buffer status report MAC CE.

[0156] <Example 4> The embodiments of the present invention provide a method for configuring a buffer status report, and the method is applied to an IAB donor. The method corresponds to Embodiments 1 to 3, and for the same content, reference may be made to the descriptions in Embodiments 1 to 3.

[0157] FIG. 18 is a schematic diagram of a method for configuring a buffer status report according to Embodiment 4 of the present invention. As shown in FIG. 18, the method includes the following steps.

[0158] Step 1801: Transmit configuration information for the buffer status report to the IAB node.

[0159] The configuration information includes at least one of: the configured logical channel group ID, the number of configured logical channels (LCHs), the configured BH LCH ID, configuring whether to use an extended LCG range, and configuring whether to use a new format of the buffer status report MAC CE.

[0160] Thus, the IAB node may determine the format of the generated buffer status report MAC CE based on the configuration information and / or the capabilities of the IAB-MT.

[0161] For example, it is configured that the configured BH LCH ID uses an extended LCH ID and / or uses an extended LCG range, and / or is configured to use a new format of the buffer status report MAC CE. In this case, the IAB node applies the new BSR MAC CE format, that is, generates the BSR MAC CE using the method described in any one of Embodiments 1 to 3.

[0162] For example, the configuration information is transmitted via RRC signaling.

[0163] According to this embodiment, by transmitting configuration information for the buffer status report to the IAB node, the IAB node can determine the format of the generated buffer status report MAC CE based on the configuration information and / or the capabilities of the IAB-MT. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0164] <Example 5> Embodiments of the present invention provide a method for buffer status reporting, which is applicable to IAB nodes and IAB donors. The method corresponds to Embodiments 1 to 4, and for similar content, reference may be made to the descriptions in Embodiments 1 to 4.

[0165] FIG. 19 is a schematic diagram of one method for a buffer status report according to Embodiment 5 of the present invention. As shown in FIG. 19, the method includes the following steps.

[0166] Step 1901: The IAB donor transmits configuration information for a buffer status report to the IAB node.

[0167] Step 1902: The IAB node determines the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT.

[0168] Step 1903: When it is determined to use the new buffer status report MAC CE format, a buffer status report MAC CE (BSR MAC CE) is generated, and the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8.

[0169] Step 1904: Transmit the buffer status report MAC CE.

[0170] In an embodiment of the present invention, Step 1901 is an optional step. For example, when the IAB node determines the format of the buffer status report MAC CE generated based on the capabilities of the IAB-MT, the network configuration may not be required, that is, the IAB donor does not need to transmit configuration information for the buffer status report.

[0171] Also, in an embodiment of the present invention, it is not necessary to directly receive configuration information from the IAB donor and directly transmit the buffer status report MAC CE to the IAB donor. For example, the configuration information may be received from the parent node of the IAB node and the buffer status report MAC CE may be transmitted to the parent node, that is, the parent node of the IAB node may be used as a relay for the configuration information and the buffer status report MAC CE.

[0172] In the embodiments of the present invention, for the specific implementation of steps 1901 to 1904, reference may be made to the description content of Embodiment 1, and the description thereof is omitted here.

[0173] FIG. 20 is a schematic diagram of one method for a buffer status report according to Embodiment 5 of the present invention. As shown in FIG. 20, the method includes the following steps.

[0174] Step 2001: The IAB donor sends configuration information for the buffer status report to the IAB node.

[0175] Step 2002: The IAB node determines the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU (donor CU) and / or the capabilities of the IAB-MT.

[0176] Step 2003: When it is determined to use the new buffer status report MAC CE format, when the number of logical channel groups having data to be transmitted does not exceed one, a short buffer status report MAC CE is generated, and the short buffer status report MAC CE includes information of the logical channel group and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes.

[0177] Step 2004: Transmit the buffer status report MAC CE.

[0178] In the embodiments of the present invention, step 2001 is an optional step. For example, when the IAB node determines the format of the buffer status report MAC CE generated based on the capabilities of the IAB-MT, the network configuration may not be required, that is, the IAB donor does not need to send configuration information for the buffer status report.

[0179] In addition, in the embodiments of the present invention, it is not necessary to directly receive configuration information from the IAB donor and directly transmit the short buffer status report MAC CE to the IAB donor. For example, the configuration information may be received from the parent node of the IAB node and the short buffer status report MAC CE may be transmitted to the parent node. That is, the parent node of the IAB node may be used as a relay for the configuration information and the short buffer status report MAC CE.

[0180] In the embodiments of the present invention, for the specific implementation of steps 2001 to 2004, reference may be made to the description in Embodiment 1, and the description thereof is omitted here.

[0181] FIG. 21 is a schematic diagram of one method for buffer status reporting according to Embodiment 5 of the present invention. As shown in FIG. 21, the method includes the following steps.

[0182] Step 2101: The IAB donor transmits configuration information for buffer status reporting to the IAB node.

[0183] Step 2102: The IAB node determines the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT.

[0184] Step 2103: When it is determined to use the new buffer status report MAC CE format, when the number of logical channel groups having data to be transmitted does not exceed N, a short buffer status report MAC CE (BSR MAC CE) is generated. The short buffer status report MAC CE includes information on N logical channel groups and at least one buffer size information, where N is an integer greater than or equal to 2.

[0185] Step 2104: Transmit the buffer status report MAC CE.

[0186] In an embodiment of the present invention, step 2101 is an optional step. For example, when the IAB node determines the format of the buffer status report MAC CE generated based on the capabilities of the IAB-MT, the network configuration may not be required, that is, the IAB donor does not need to transmit configuration information for the buffer status report.

[0187] Also, in an embodiment of the present invention, it is not necessary to directly receive configuration information from the IAB donor and directly transmit the short buffer status report MAC CE to the IAB donor. For example, the configuration information may be received from the parent node of the IAB node and the short buffer status report MAC CE may be transmitted to the parent node. That is, the parent node of the IAB node may act as a relay for the configuration information and the short buffer status report MAC CE.

[0188] In an embodiment of the present invention, the specific implementation of steps 2101 to 2104 may refer to the description in Embodiment 1, and the description thereof is omitted here.

[0189] According to this embodiment, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0190] <Example 6> An embodiment of the present invention provides an apparatus for buffer status reporting, and the apparatus is applicable to an IAB node. Since the principle of solving the problems of the apparatus is the same as that of the method in Embodiment 1, the specific implementation thereof may refer to the method in Embodiment 1, and the description of the same content or related parts is omitted.

[0191] FIG. 22 is a schematic diagram of an apparatus for buffer status reporting according to Embodiment 6 of the present invention. As shown in FIG. 22, the apparatus 2200 for buffer status reporting includes the following parts.

[0192] The first generation unit 2201 generates a buffer status report MAC CE (BSR MAC CE). The buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8.

[0193] The first transmission unit 2202 transmits the buffer status report MAC CE.

[0194] In an embodiment of the present invention, when the number of padding bits is greater than or equal to the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and buffer size information corresponding to the logical channel groups.

[0195] In an embodiment of the present invention, the buffer status report may be a truncated buffer status report (Truncated BSR). When the number of padding bits is less than the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information on logical channel groups having data to be transmitted that does not exceed the number of padding bits and at least one buffer size information corresponding to the logical channel groups.

[0196] In an embodiment of the present invention, the buffer status report MAC CE may include a first buffer status report MAC CE. The first buffer status report MAC CE indicates whether buffer size information corresponding to a logical channel group is reported or whether the logical channel group has data to be transmitted via a bitmap.

[0197] In an embodiment of the present invention, two logical channel IDs (LCIDs) or one-byte extended logical channel IDs (eLCIDs) may be used to identify whether the first buffer status report MAC CE is a buffer status report MAC CE or a shortened buffer status report MAC CE.

[0198] In an embodiment of the present invention, the buffer status report MAC CE may include at least two second buffer status report MAC CEs. The at least two second buffer status report MAC CEs jointly include information on all logical channel groups having data to be transmitted.

[0199] In an embodiment of the present invention, the second buffer status report MAC CE may be identified by a logical channel ID.

[0200] In an embodiment of the present invention, different second buffer status report MAC CEs may be identified by different logical channel IDs.

[0201] In an embodiment of the present invention, as shown in FIG. 22, the apparatus 2200 for buffer status report may further include a determination unit 2203.

[0202] The determination unit 2203 determines the format of the generated buffer status report MAC CE based on the configuration information received from a donor CU and / or the capabilities of the IAB-MT.

[0203] According to this embodiment, without performing the determination operation of the long BSR or short BSR report, a BSR MAC CE including information on all logical channel groups having data to be transmitted and having a maximum possible number greater than 8 and at least one buffer size information is generated and transmitted. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. In addition, by removing the determination operation for the long BSR or short BSR report by the IAB-MT in the existing standard, the operation of the IAB-MT can be simplified, and the product can be easily realized. Furthermore, the number of newly introduced MAC CEs is small, the occupation of related IDs can be reduced, and the complexity of the system design can be reduced.

[0204] <Example 7> The embodiment of the present invention provides an apparatus for buffer status report, and the apparatus is applied to an IAB node. Since the principle of solving the problems of the apparatus is the same as that of the method in Embodiment 2, the specific implementation thereof may refer to the method in Embodiment 2, and the description thereof for the same content or related parts is omitted.

[0205] FIG. 23 is a schematic diagram of an apparatus for buffer status report according to Embodiment 7 of the present invention. As shown in FIG. 23, the apparatus 2300 for buffer status report includes the following parts.

[0206] When the number of logical channel groups having data to be transmitted does not exceed 1, the second generation unit 2301 generates a short buffer status report MAC CE. The short buffer status report MAC CE includes information on a logical channel group and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes.

[0207] The second transmission unit 2302 transmits the short buffer status report MAC CE.

[0208] In the embodiment of the present invention, the length of the information on the logical channel group may be 4 to 8 bits.

[0209] In an embodiment of the present invention, the information of the logical channel group and the reserved bits may form a byte.

[0210] In an embodiment of the present invention, the information of the logical channel group may be located before or after the reserved bits.

[0211] In an embodiment of the present invention, the information of the logical channel group may be adjacent to the buffer size information.

[0212] In an embodiment of the present invention, the length of the sub-header of the short buffer status report MAC CE may be 1 byte, and the length of the MAC sub-PDU including the short buffer status report MAC CE may be 3 bytes. In an embodiment of the present invention, the apparatus 2300 for the buffer status report may further include a unit having the same function as the determination unit 2203.

[0213] According to this embodiment, when the number of logical channel groups having data to be transmitted does not exceed 1, a short BSR MAC CE including the information of the logical channel group and the buffer size information and having a length of 2 bytes is generated and transmitted. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. Also, the total number of bytes of the MAC sub-PDU including the short buffer status report MAC CE is small, and the signaling overhead is not large. Furthermore, by increasing the length of the Buffer Size field, a smaller range of buffer values can be indicated by the value (index) of one Buffer Size field, and the accuracy of the Buffer Size field can be improved, which is advantageous for the IAB parent node or the IAB donor to perform more accurate uplink resource allocation.

[0214] <Example 8> Embodiments of the present invention provide a buffer status report apparatus, which is applicable to an IAB node. Since the principle of solving the problems of the apparatus is the same as that of the method in Embodiment 3, the specific implementation thereof may refer to the method in Embodiment 3, and the description thereof for the same content or related parts is omitted.

[0215] FIG. 24 is a schematic diagram of a buffer status report apparatus according to Embodiment 8 of the present invention. As shown in FIG. 24, the buffer status report apparatus 2400 includes the following parts.

[0216] When the number of logical channel groups having data to be transmitted does not exceed N, the third generation unit 2401 generates a short buffer status report MAC CE (BSR MAC CE). The short buffer status report MAC CE includes information of N logical channel groups and at least one buffer size information, where N is an integer greater than or equal to 2.

[0217] The third transmission unit 2402 transmits the short buffer status report MAC CE.

[0218] In an embodiment of the present invention, the length of the information of each logical channel group may be 4 to 8 bits.

[0219] In an embodiment of the present invention, the information of the at least N logical channel groups may be located in the same byte or in different bytes.

[0220] In an embodiment of the present invention, in the short buffer status report MAC CE or the new short buffer status report MAC CE or the short shortened buffer status report MAC CE or the new short shortened buffer status report MAC CE, at least one piece of information of the N logical channel groups among the information of the N logical channel groups is adjacent to the corresponding buffer size information, and / or at least two pieces of information of the N logical channel groups among the information of the N logical channel groups are adjacent, and / or at least two buffer size information, that is, the Buffer size field is adjacent.

[0221] In an embodiment of the present invention, for example, the N is 8, and the information of the 8 logical channel groups included in the short buffer status report MAC CE is composed of bytes.

[0222] In an embodiment of the present invention, the apparatus 2400 for buffer status report may further include a unit having the same function as the determination unit 2203. According to this embodiment, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided. In addition, since the IAB node usually serves many UEs and / or IAB child nodes as a relay node in the network, the IAB-MT usually has data to be transmitted to two or more logical channel groups, but in some cases, there is only data to be transmitted to a small number of logical channel groups. In this case, by adopting the short buffer status report MAC CE format in this embodiment, the signaling overhead can be reduced and radio resources can be saved compared with the case of transmitting the long buffer status report MAC CE.

[0223] <Example 9> The embodiment of the present invention provides an apparatus for configuring a buffer status report, and the apparatus is applied to an IAB donor. Since the principle of solving the problem of the apparatus is the same as that of the method in Embodiment 4, the specific implementation thereof may refer to the method in Embodiment 4, and the description thereof for the same content or related parts is omitted.

[0224] Figure 25 is a schematic diagram of one of the buffer status report configuration apparatuses according to Embodiment 9 of the present invention. As shown in Figure 25, the buffer status report configuration apparatus 2500 includes the following components.

[0225] The transmission unit 2501 transmits configuration information for the buffer status report to the IAB node.

[0226] The configuration information includes at least one of configuring a configured logical channel group ID, the number of configured logical channels (LCHs), a configured BH LCH ID, whether to use an extended LCG range, and whether to use a new format of the buffer status report MAC CE.

[0227] For example, the configured BH LCH ID is configured to adopt an extended LCH ID and / or adopt an extended LCG range, and / or adopt a new format of the buffer status report MAC CE.

[0228] For example, the configuration information is transmitted via RRC signaling.

[0229] According to this embodiment, by transmitting configuration information for the buffer status report to the IAB node, the IAB node can determine the format of the generated buffer status report MAC CE based on the configuration information and / or the capabilities of the IAB-MT. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0230] <Embodiment 10> Embodiments of the present invention provide a network device, and the network device includes, for example, the buffer status report apparatus of Embodiment 6 or Embodiment 7 or Embodiment 8.

[0231] FIG. 26 is a schematic block diagram of one of the system configurations of the network device according to Embodiment 10 of the present invention. As shown in FIG. 26, the network device 2600 may include a processor 2610 and a memory 2620, and the memory 2620 is connected to the processor 2610. Note that this figure is exemplary, and other types of structures may be used to supplement or replace this structure to implement communication functions or other functions.

[0232] In one aspect, the function of the buffer status report device may be integrated into the processor 2610.

[0233] The processor 2610 may be configured to perform a step of generating a buffer status report MAC CE (BSR MAC CE), where the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8, and a step of transmitting the buffer status report MAC CE.

[0234] Alternatively, when the number of logical channel groups having data to be transmitted does not exceed one, the processor 2610 may be configured to perform a step of generating a short buffer status report MAC CE, where the short buffer status report MAC CE includes information on the logical channel group and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes, and a step of transmitting the short buffer status report MAC CE.

[0235] Alternatively, when the number of logical channel groups having data to be transmitted does not exceed N, the processor 2610 may perform the steps of generating a short buffer status report MAC CE (BSR MAC CE), where the short buffer status report MAC CE includes information on N logical channel groups and at least one buffer size information, and N is an integer greater than or equal to 2, and transmitting the short buffer status report MAC CE.

[0236] In another aspect, the buffer status report device may be configured separately from the processor 2610. For example, the buffer status report device may be configured as a chip connected to the processor 2610, and the functions of the buffer status report device are realized under the control of the processor 2610.

[0237] As shown in FIG. 26, the network device 2600 may further include a transceiver 2640, an antenna 2650, etc. The functions of the above members are similar to those of the prior art, and the description thereof is omitted here. Note that the network device 2600 does not necessarily include all the units shown in FIG. 26. In addition, the network device 2600 may further include units not shown in FIG. 26, and reference may be made to the prior art.

[0238] According to this embodiment, without performing the determination operation of the long BSR or short BSR report, a BSR MAC CE is generated and transmitted, which includes information of all logical channel groups having data to be transmitted and with the maximum possible number greater than 8, and at least one buffer size information. Or, when the number of logical channel groups having data to be transmitted does not exceed 1, a short BSR MAC CE is generated and transmitted, which includes the information of the logical channel group, the buffer size information, and has a length of 2 bytes. Or, when the number of logical channel groups having data to be transmitted does not exceed N (N is an integer greater than or equal to 2), a short BSR MAC CE is generated and transmitted, which includes information of N logical channel groups (N is an integer greater than or equal to 2) and at least one buffer size information. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0239] <Example 11> An embodiment of the present invention provides a network device, which includes, for example, a buffer status report configuring device of Example 9.

[0240] FIG. 27 is a schematic block diagram of a system configuration of the network device according to Example 11 of the present invention. As shown in FIG. 27, the network device 2700 may include a processor 2710 and a memory 2720, and the memory 2720 is connected to the processor 2710. Here, the memory 2720 may store various data, and further store a program 2730 for information processing. The processor 2710 executes the program 2730 under its control, receives various information transmitted from the terminal device, and transmits various information to the terminal device.

[0241] In one aspect, the function of the buffer status report configuring device may be integrated into the processor 2710. The processor 2710 may be configured to execute the step of transmitting configuration information for the buffer status report to the IAB node.

[0242] The configuration information includes at least one of the configured logical channel group ID, the number of configured logical channels (LCHs), the configured BH LCH ID, configuring whether to use an extended LCG range, and configuring whether to use a new format of the buffer status report MAC CE.

[0243] In another aspect, the configuring device of the buffer status report may be configured separately from the processor 2710. For example, the configuring device of the buffer status report may be configured as a chip connected to the processor 2710, and the functions of the configuring device of the buffer status report are realized under the control of the processor 2710.

[0244] Also, as shown in FIG. 27, the network device 2700 may further include a transceiver 2740, an antenna 2750, etc. The functions of the above members are similar to those in the prior art, and the description thereof is omitted here. Note that the network device 2700 does not necessarily include all the units shown in FIG. 27. Also, the network device 2700 may further include units not shown in FIG. 27 and may refer to the prior art.

[0245] According to this embodiment, by transmitting the configuration information for the buffer status report to the IAB node, the IAB node can determine the format of the generated buffer status report MAC CE based on the configuration information and / or the capabilities of the IAB-MT. Thereby, when the maximum number of logical channel groups exceeds 8, an effective BSR reporting mechanism can be provided.

[0246] <Example 12> Embodiments of the present invention provide a communication system.

[0247] For example, the communication system includes a first network device and a second network device, the first network device is the network device of Example 10, and the second network device is the network device of Example 11.

[0248] FIG. 28 is a schematic diagram of a communication system according to Embodiment 12 of the present invention. As shown in FIG. 28, the communication system 2800 includes a first network device 2801, a second network device 2802, and a terminal device 2803. The first network device 2801 is an IAB node, the second network device 2802 is an IAB donor, and the terminal device 2803 is a terminal device that provides services to the IAB node.

[0249] In addition, the first network device 2801, that is, the IAB node, may have child nodes, and the child nodes may provide services to the terminal device.

[0250] In addition, the first network device 2801, that is, the IAB node, may have a parent node, and the first network device 2801 may perform information interaction with the IAB donor via the parent node.

[0251] The above devices and methods of the present invention may be implemented by hardware, or may be implemented by combining hardware and software. The present invention relates to a computer-readable program, which, when executed by a logic unit, can cause the logic unit to implement the above-described devices or components, or implement the various methods or steps described above. The present invention relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0252] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in FIG. 22, or one or more combinations of the functional block diagrams, may correspond to each software module of the computer program flow, or may correspond to each hardware module. These software modules may respectively correspond to each step shown in FIG. 5. These hardware modules may be realized by hardware-implementing these software modules using, for example, a field programmable gate array (FPGA).

[0253] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor so that the processor reads information from the storage medium and / or writes information to the storage medium, or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal or may be stored in a memory card inserted into the mobile terminal. For example, when a device (such as a mobile terminal) uses a relatively large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0254] One or more functional blocks and / or one or more combinations of functional blocks in the functional block diagram described in FIG. 22 may be implemented by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof for performing the functions described in this application. One or more functional blocks and / or one or more combinations of functional blocks in the functional block diagram described in FIG. 17 may be implemented, for example, by a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors combined with DSP communication, or any other configuration.

[0255] The present invention has been described above with reference to specific embodiments, but the above description is merely exemplary and does not limit the protection scope of the present invention. Without departing from the spirit and principle of the present invention, various modifications and changes may be made to the present invention, and these modifications and changes are also within the scope of the present invention.

[0256] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above-described examples. (Supplementary Note 1) An apparatus for a buffer status report applied to an IAB node, comprising: a first generation unit for generating a buffer status report MAC CE (BSR MAC CE), wherein the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8; a first transmission unit for transmitting the buffer status report MAC CE. (Supplementary Note 2) If the number of padding bits is equal to or greater than the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and buffer size information corresponding to the logical channel groups, as described in Appendix 1 of the device. (Appendix 3) The buffer status report is a Truncated BSR, If the number of padding bits is less than the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information on logical channel groups having data to be transmitted that does not exceed the number of padding bits and buffer size information corresponding to at least one logical channel group, as described in Appendix 2 of the device. (Appendix 4) The buffer status report MAC CE includes a first buffer status report MAC CE, The first buffer status report MAC CE indicates whether buffer size information corresponding to a logical channel group has been reported via a bitmap or whether the logical channel group has data to be transmitted, as described in any of Appendices 1 to 3 of the device. (Appendix 5) Two logical channel IDs (LCIDs) or a one-byte extended logical channel ID (eLCID) are used to identify whether the first buffer status report MAC CE is a buffer status report MAC CE or a truncated buffer status report MAC CE, as described in Appendix 4 of the device. (Appendix 6) The buffer status report MAC CE includes at least two second buffer status report MAC CEs, The at least two second buffer status report MAC CEs jointly include information on all logical channel groups having data to be transmitted, as described in any of Appendices 1 to 3 of the device. (Appendix 7) The second buffer status report MAC CE is the device described in Appendix 6, identified by the logical channel ID. (Appendix 8) Different second buffer status report MAC CEs are the devices described in Appendix 6 or 7, identified by different logical channel IDs. (Appendix 9) A buffer status report device applied to an IAB node, when the number of logical channel groups having data to be transmitted does not exceed one, a second generation unit that generates a short buffer status report MAC CE, where the short buffer status report MAC CE includes logical channel group information and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes, a second generation unit; A device including a second transmission unit that transmits the short buffer status report MAC CE. (Appendix 10) The device according to Appendix 9, where the length of the logical channel group information is 4 to 8 bits. (Appendix 11) The device according to Appendix 9, where the logical channel group information and reserved bits constitute a byte. (Appendix 12) The device according to Appendix 11, where the logical channel group information is located before or after the reserved bits. (Appendix 13) The device according to Appendix 9, where the logical channel group information is adjacent to the buffer size information. (Appendix 14) The length of the sub-header of the short buffer status report MAC CE is 1 byte, The device according to Appendix 9, where the length of the MAC sub-PDU including the short buffer status report MAC CE is 3 bytes. (Appendix 15) A buffer status report device applied to an IAB node, When the number of logical channel groups having data to be transmitted does not exceed N, a third generation unit that generates a short buffer status report MAC CE (BSR MAC CE), where the short buffer status report MAC CE includes information on N logical channel groups and at least one buffer size information, and N is an integer of 2 or more, a third generation unit; A third transmission unit that transmits the short buffer status report MAC CE, and a device including the same. (Appendix 16) The device according to Appendix 15, wherein the length of the information of each of the logical channel groups is 4 to 8 bits. (Appendix 17) The device according to Appendix 15 or 16, wherein the information on at least N logical channel groups is located in the same byte or different bytes. (Appendix 18) Among the information on N logical channel groups, the information on at least one logical channel group is adjacent to the corresponding buffer size information, and / or Among the information on N logical channel groups, the information on at least two logical channel groups is adjacent, and / or The device according to Appendix 15, wherein at least two buffer size information are adjacent. (Appendix 19) The device according to Appendix 15, wherein N is 8, and the information on 8 logical channel groups included in the short buffer status report MAC CE constitutes a byte. (Appendix 20) The device according to any one of Appendices 9 to 14, further including generating a long buffer status report MAC CE when the number of logical channel groups having data to be transmitted exceeds 1. (Appendix 21) The device according to any one of Appendices 15 to 19, further including generating a long buffer status report MAC CE when the number of logical channel groups having data to be transmitted exceeds N. (Appendix 22) The short buffer status report MAC CE includes a short buffer status report MAC CE and a short shortened buffer status report MAC CE, The long buffer status report MAC CE is the apparatus according to any one of Appendices 9 to 21, including a long buffer status report MAC CE and a long shortened buffer status report MAC CE. (Appendix 23) The short buffer status report MAC CE, the short shortened buffer status report MAC CE, the long buffer status report MAC CE, and the long shortened buffer status report MAC CE are the apparatus according to Appendix 22, which are identified by four logical channel IDs (LCIDs) or four one-byte extended logical channel IDs (eLCIDs). (Appendix 24) The apparatus according to any one of Appendices 1 to 23, further comprising a determination unit that determines a format of the generated buffer status report MAC CE based on configuration information received from a donor CU and / or the capabilities of the IAB-MT. (Appendix 25) When the conditions are met, the apparatus according to any one of Appendices 1 to 23 generates a buffer status report MAC CE, The conditions are that the maximum value of the configured logical channel group ID is greater than a first threshold, that the number of configured logical channels (LCHs) is equal to or greater than a second threshold, that the configured BH LCH ID adopts an extended LCH ID, that the use of an extended LCG range is configured, that the use of a new format of the buffer status report MAC CE is configured, and the apparatus according to Appendix 24, including at least one of the IAB-MT supporting more than eight LCGs. (Appendix 26) The configuration information is transmitted via RRC signaling, the apparatus according to Appendix 25. (Appendix 27) A buffer status report configuring apparatus applied to an IAB donor, comprising: a transmitter that transmits configuration information for a buffer status report to an IAB node. The configuration information includes: a configured logical channel group ID, the number of configured logical channels (LCHs), a configured BH LCH ID, configuring whether to use an extended LCG range, and configuring whether to use a new format of a buffer status report MAC CE, and at least one of the above. (Appendix 28) The configured BH LCH ID adopts an extended LCH ID and / or is configured to adopt an extended LCG range, and / or The apparatus according to Appendix 27, which is configured to adopt a new format of a buffer status report MAC CE. (Appendix 29) The configuration information is transmitted via RRC signaling. The apparatus according to Appendix 27 or 28. (Appendix 30) A network apparatus including the apparatus according to any one of Appendices 1 to 29. (Appendix 31) A communication system including a first network apparatus, a second network apparatus, and a terminal apparatus, wherein the first network apparatus includes the apparatus according to any one of Appendices 1 to 26, and the second network apparatus includes the apparatus according to any one of Appendices 27 to 29. (Appendix 32) A method for a buffer status report applied to an IAB node, comprising: A step of generating a buffer status report MAC CE (BSR MAC CE), wherein the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum possible number of the logical channel groups is greater than 8; A step of transmitting the buffer status report MAC CE. A method comprising: (Appendix 33) If the number of padding bits is greater than or equal to the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information of all logical channel groups having data to be transmitted and buffer size information corresponding to the logical channel groups. The method according to Appendix 32. (Appendix 34) The buffer status report is a truncated buffer status report (Truncated BSR), If the number of padding bits is less than the total size of the buffer status report MAC CE and its sub-header, the buffer status report MAC CE includes information of logical channel groups having data to be transmitted that does not exceed the number of padding bits and at least one buffer size information corresponding to the logical channel groups. The method according to Appendix 33. (Appendix 35) The buffer status report MAC CE includes a first buffer status report MAC CE, The first buffer status report MAC CE indicates, via a bitmap, whether buffer size information corresponding to a logical channel group is reported or whether the logical channel group has data to be transmitted. The method according to any one of Appendices 32 to 34. (Appendix 36) Two logical channel IDs (LCIDs) or one-byte extended logical channel IDs (eLCIDs) are used to identify whether the first buffer status report MAC CE is a buffer status report MAC CE or a shortened buffer status report MAC CE, in accordance with the method described in Annex 35. (Annex 37) The buffer status report MAC CE includes at least two second buffer status report MAC CEs, The at least two second buffer status report MAC CEs jointly include information on all logical channel groups having data to be transmitted, in accordance with the method described in any of Annexes 32 to 35. (Annex 38) The second buffer status report MAC CE is identified by a logical channel ID, in accordance with the method described in Annex 37. (Annex 39) Different second buffer status report MAC CEs are identified by different logical channel IDs, in accordance with the method described in Annex 37 or 38. (Annex 40) A method for buffer status reporting applied to an IAB node, When the number of logical channel groups having data to be transmitted does not exceed one, the step of generating a short buffer status report MAC CE, where the short buffer status report MAC CE includes information on the logical channel group and buffer size information, and the length of the short buffer status report MAC CE is 2 bytes, The step of transmitting the short buffer status report MAC CE. (Annex 41) The length of the information on the logical channel group is 4 to 8 bits, in accordance with the method described in Annex 40. (Annex 42) The information on the logical channel group and the reserved bits constitute a byte, in accordance with the method described in Annex 40. (Annex 43) The information of the logical channel group is the method described in Appendix 42, located before or after the reserved bit. (Appendix 44) The information of the logical channel group is the method described in Appendix 40, adjacent to the buffer size information. (Appendix 45) The length of the sub-header of the short buffer status report MAC CE is 1 byte, The length of the MAC sub-PDU including the short buffer status report MAC CE is 3 bytes, the method described in Appendix 40. (Appendix 46) A method of buffer status report applied to an IAB node, When the number of logical channel groups having data to be transmitted does not exceed N, a step of generating a short buffer status report MAC CE (BSR MAC CE), where the short buffer status report MAC CE includes information of N logical channel groups and at least one buffer size information, and N is an integer greater than or equal to 2, the step; A step of transmitting the short buffer status report MAC CE, including the method. (Appendix 47) The length of the information of each logical channel group is 4 to 8 bits, the method described in Appendix 46. (Appendix 48) The information of at least N logical channel groups is located in the same byte or different bytes, the method described in Appendix 46 or 47. (Appendix 49) The information of at least one logical channel group among the information of the N logical channel groups is adjacent to its corresponding buffer size information, and / or The information of at least two logical channel groups among the information of the N logical channel groups is adjacent, and / or At least two buffer size information are adjacent, the method described in Appendix 46. (Appendix 50) N is 8, and the information of the 8 logical channel groups included in the short buffer status report MAC CE is the method described in Appendix 46 that constitutes bytes. (Appendix 51) When the number of logical channel groups having data to be transmitted exceeds 1, further including generating a long buffer status report MAC CE, the method according to any one of Appendices 40 to 45. (Appendix 52) When the number of logical channel groups having data to be transmitted exceeds N, further including generating a long buffer status report MAC CE, the method according to any one of Appendices 46 to 50. (Appendix 53) The short buffer status report MAC CE includes a short buffer status report MAC CE and a short shortened buffer status report MAC CE. The long buffer status report MAC CE includes a long buffer status report MAC CE and a long shortened buffer status report MAC CE, the method according to any one of Appendices 40 to 52. (Appendix 54) The short buffer status report MAC CE, the short shortened buffer status report MAC CE, the long buffer status report MAC CE, and the long shortened buffer status report MAC CE are identified by 4 logical channel IDs (LCIDs) or 4 one-byte extended logical channel IDs (eLCIDs), the method according to Appendix 53. (Appendix 55) Further including the step of determining the format of the generated buffer status report MAC CE based on the configuration information received from the donor CU and / or the capabilities of the IAB-MT, the method according to any one of Appendices 32 to 54. (Appendix 56) When the conditions are met, generating a buffer status report MAC CE by the method according to any one of Appendices 32 to 54. The conditions are The maximum value of the configured logical channel group ID is greater than a first threshold, the number of configured logical channels (LCHs) is greater than or equal to a second threshold, the configured BH LCH ID adopts an extended LCH ID, the use of an extended LCG range is configured, the use of a new format of the buffer status report MAC CE is configured, and the method according to Appendix 55, including at least one of the IAB-MT supporting more than eight LCGs. (Appendix 57) The method according to Appendix 56, wherein the configuration information is transmitted via RRC signaling. (Appendix 58) A method for configuring a buffer status report applied to an IAB donor (IAB-donor), comprising: transmitting configuration information for a buffer status report to an IAB node, wherein the configuration information includes a configured logical channel group ID, the number of configured logical channels (LCHs), a configured BH LCH ID, configuring whether to use an extended LCG range, and a method including at least one of configuring whether to use a new format of the buffer status report MAC CE. (Appendix 59) The configured BH LCH ID adopts an extended LCH ID and / or the adoption of an extended LCG range is configured, and / or the method according to Appendix 58, wherein the adoption of a new format of the buffer status report MAC CE is configured. (Appendix 60) The method according to Appendix 58 or 59, wherein the configuration information is transmitted via RRC signaling.

Claims

1. An apparatus for a buffer status report applied to an IAB node (IAB-node), comprising: a processor for generating a buffer status report MAC CE (BSR MAC CE), wherein the buffer status report MAC CE includes information on all logical channel groups having data to be transmitted and at least one buffer size information, and the maximum number of the logical channel groups is greater than 8; and a transmitter for transmitting the buffer status report MAC CE. The processor determines a format of the generated buffer status report MAC CE based on configuration information received from a donor CU (donor CU). When the maximum value of the configured logical channel group ID in the configuration information is greater than a first threshold, the processor generates the buffer status report MAC CE. When the maximum value of the configured logical channel group ID in the configuration information is less than or equal to the first threshold, the processor generates a legacy buffer status report MAC CE.

2. The apparatus according to claim 1, wherein the maximum number of the logical channel groups is 256.

3. The buffer status report MAC CE includes a first buffer status report MAC CE. The first buffer status report MAC CE indicates whether buffer size information corresponding to a logical channel group is reported or whether the logical channel group has data to be transmitted via a bitmap. The apparatus according to claim 1.

4. A 1-byte extended logical channel ID (eLCID) is used to identify whether the first buffer status report MAC CE is a buffer status report MAC CE or a shortened buffer status report MAC CE. The apparatus according to claim 3.

5. The apparatus according to claim 3, wherein the length of the bitmap is 32 bytes.

6. The bitmap includes 256 logical channel group (LCG) fields. The apparatus according to claim 3, wherein the logical channel group fields are sorted in ascending order of the indexes of the logical channel group fields.

7. The apparatus according to claim 1, wherein the processor generates the buffer status report MAC CE for pre - emptive BSR. **Claim 8** An apparatus for a buffer status report applied to an IAB node, wherein when the number of logical channel groups having data to be transmitted does not exceed one, a processor generates a short buffer status report MAC CE, the short buffer status report MAC CE includes a logical channel group ID field (LCG ID field) and a buffer size field (Buffer Size field), the length of the short buffer status report MAC CE is 2 bytes, the length of the logical channel group ID field is 1 byte, and the length of the buffer size field is 1 byte; and a processor; a transmitter configured to transmit the short buffer status report MAC CE. The apparatus, wherein the extended short buffer status report MAC CE, the extended short - shortened buffer status report MAC CE, the extended long buffer status report MAC CE, and the extended long - shortened buffer status report MAC CE are identified by four extended logical channel IDs (eLCIDs). **Claim 9** The apparatus according to claim 8, wherein the length of the logical channel group ID field is 8 bits. **Claim 10** The apparatus according to claim 8, wherein the code point value of the extended short buffer status report MAC CE, the extended short - shortened buffer status report MAC CE, the extended long buffer status report MAC CE, or the extended long - shortened buffer status report MAC CE is any one of 0 to 249.

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