TWM607390U - User equipment and communication system based on carrier aggregation and integrated access and backhaul - Google Patents

Abstract

A user equipment and a communication system are provided. The data duplication is activated on one or more data units of packet data convergence protocol (PDCP). The data duplication is that, in the carrier aggregation (CA), one data unit corresponds to two or more component carriers provided by a base station based on integrated access and backhaul (IAB) mechanism. For each data unit, two or more buffer status reports (BSRs) are triggered, and each BSR corresponds to one logical channel. Then, at least one BSR is canceled according to a canceling condition. Accordingly, the IAB network can be applied with multiple BSR cancellation.

Description

User equipment and communication system based on carrier aggregation and access and post-transmission

The present invention relates to a radio resource management technology, and particularly to a user equipment (UE) and communication system.

In the uplink (UL) resource scheduling, the user equipment can transmit a sounding reference signal (Sounding Reference Signal, SRS) to let the base station know the quality of the uplink channel. Then, if the user equipment has a data transmission requirement but has not yet obtained uplink resources, the user equipment can send a scheduling request (SR) to inform the base station that there is a resource requirement. After receiving the scheduling request, the base station can allocate a small amount of resources to let the user equipment inform the amount of data to be transmitted. Then, the user equipment can send a Buffer Status Report (BSR) regarding the amount of data, so that the base station can allocate uplink resources for this amount of data. However, the uplink resources are limited, and the triggered buffer status report may inevitably be cancelled, requiring the user equipment to request resources again.

In view of this, the present invention provides a user equipment and communication system to provide cancellation of buffer status reports under Carrier Aggregation (CA) for the Integrated Access and Backhaul (IAB) mechanism.

The communication system of the present invention includes base station and user equipment. The base station is suitable for integrating access and post-transmission mechanisms. The user equipment is configured to: enable data duplication (data duplication) for one or more data units of the Packet Data Convergence Protocol (PDCP). This data duplication corresponds to the data units under carrier aggregation Two or more component carriers (CCs) provided by a base station that integrates the access and backhaul mechanism. Two or more buffer status reports are triggered for each data unit, and each buffer status report corresponds to a logical channel (Logical Channel, LCH). Cancel the buffer status report on at least one of the logical channels according to the cancellation condition.

The user equipment of the present invention includes (but is not limited to) a transmitter and a processor. The transmitter uses the transmitted signal. The processor is coupled to the transmitter and is configured to enable data replication for one or more data units of the packet data aggregation protocol, trigger two or more buffer status reports for each data unit, and cancel logic according to cancellation conditions Buffer status report on at least one of the channels. This data replication is to map a data unit to two or more component carriers provided by a base station that integrates the access and post-transmission mechanism under carrier aggregation. Each buffer status report corresponds to a logical channel, and those buffer status reports are transmitted through the transmitter.

Based on the above, the user equipment and communication system of the creative embodiment of the present invention can use several component carriers provided by the base station of the integrated access and backhaul mechanism to respectively transmit the original data unit and the copied data unit, and respond to the conformity The cancellation condition cancels the triggered buffer status report corresponding to the data unit. In this way, it can be applied to the integrated access and post-transmission mechanism of the fifth generation (5G) mobile communication.

In order to make the above-mentioned features and advantages of the new creation more obvious and understandable, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows.

Fig. 1 is a schematic diagram of a communication system 1 according to an embodiment of the invention. Please refer to Figure 1, the communication system 1 includes (but is not limited to) one or more integrated access and backhaul (Integrated Access and Backhaul, IAB)-node (node) 10, one or more IAB-supply A donor 30, one or more core network entities 50, and one or more user equipment 100.

Both IAB-Node 10 and IAB-Provider 30 are base stations that support the IAB mechanism, and can be next-generation node B (gNB), home evolved node B (Home Evolved Node B, HeNB), and base transceiver system (Base Transceiver System). Transceiver System (BTS), repeater (relay), repeater (repeater) or other types of base stations.

In 5G New Radio (NR), the release-16 released by the 3rd Generation Partnership Project (3GPP) incorporates the IAB mechanism into the standard and can be applied to short-distance access for high-density deployments Network (for example, small cell). The IAB mechanism includes multiple-hop backhaul. For example, the IAB-node 10 or the IAB-provider 30 may provide an access link (access link) AL to the user equipment 100, and transmit it directly or indirectly (hop) to other IABs via the backhaul link BL. -Node 10 or IAB-Supplier 30. The access link AL and the backhaul link BL may use the same or different carrier frequencies (for example, their operating frequencies are between 4 GHz and 30 GHz). In addition, under the second layer (layer 2, L2) relay, the quality of service (QoS) processing can be limited to the radio access network (Radio Access Network, RAN) level, thereby reducing the inter-core network Signaling costs.

In order to realize the backhaul link BL, the IAB-node 10 may include a mobile terminal (Mobile Termination, MT) function (which can be regarded as a component of a mobile device) and a next-generation node B function or a distributed unit function (which can be regarded as a base Station components) to transfer data from the user equipment 100, other IAB-nodes 10, or IAB-providers 30.

On the other hand, a next-generation node B can split its functions to form a Central Unit (CU) and one or more Distributed Units (DUs). Among them, the central unit may be responsible for functions such as Service Data Adaptation Protocol (SDAP) and Packet Data Convergence Protocol (PDCP), and the decentralized unit may be responsible for functions such as radio link control ( Radio Link Control (RLC), Media Access Control (MAC) and physical (PHY) layer functions. In some embodiments, the IAB-node 10 may implement a decentralized unit, and the IAB-supplier 30 may implement a central unit, or both the decentralized unit and the central unit.

The core network entity 50 is connected to the IAB-supplier 30, and can be regarded as a certain network entity in the core network, and can be a server, a background host, a desktop computer, and other devices.

The user equipment 100 may have a variety of implementation modes, for example, it may include (but is not limited to) a mobile station, an advanced mobile station (Advanced Mobile Station, AMS), a telephone device, a customer premise equipment (Customer Premise Equipment, CPE), and a wireless sensor. Detector and so on.

FIG. 2 is a block diagram of the components of the user equipment 100 according to an embodiment of the invention. Please refer to FIG. 2, the user equipment 100 includes (but is not limited to) an antenna 110, a receiver 120, a transmitter 130, an analog-to-digital and digital-to-analog converter 140, a storage 150 and a processor 160. The antenna 110 is coupled to the receiver 120 and the transmitter 130. The analog-to-digital and digital-to-analog converter 140 is coupled to the receiver 120, the transmitter 130, and the processor 160. The processor 160 is further coupled to the storage 150.

The receiver 120 and the transmitter 130 are used to wirelessly receive a downlink signal and transmit an uplink signal through the antenna 110, respectively. The receiver 120 and the transmitter 130 can also perform analog signal processing operations such as low noise amplification, impedance matching, frequency mixing, frequency up or down conversion, filtering, amplification and the like. The analog-to-digital and digital-to-analog converter 140 is configured to convert from an analog signal format to a digital signal format during downlink signal processing, and to convert from a digital signal format to an analog signal format during uplink signal processing.

The storage 150 can be any type of fixed or removable random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), flash memory (Flash Memory) or similar components Or a combination of the above elements. The memory 150 records program codes, device configurations, codebooks, buffered or permanent data, and records software modules related to various communication protocols such as RRC layer, PDCP layer, RLC layer, MAC layer, and their data.

The processor 160 is configured to process digital signals and execute procedures according to the exemplary embodiment of the invention, and can access or load data and software modules recorded in the memory 150. The functions of the processor 160 can be achieved by using central processing units (CPU), microprocessors, microcontrollers, digital signal processing (DSP) chips, and field programmable logic gate arrays (Field Programmable Logic Gate Array). Programmable Gate Array, FPGA) and other programmable units to implement. The function of the processor 160 can also be implemented by an independent electronic device or an integrated circuit (IC), and the operation of the processor 160 can also be implemented by software.

Hereinafter, the method described in the creative embodiment of the present invention will be explained in conjunction with each device and its components in the communication system 1. The various processes of the method for creating the embodiment of the present invention can be adjusted accordingly according to the implementation situation, and are not limited to this.

Fig. 3 is a flowchart of a method for canceling a buffer status report according to an embodiment of the present invention. Referring to FIG. 3, the processor 160 of the user equipment 100 can enable data duplication on the data unit of the PDCP (step S310). Specifically, the data unit can be a protocol data unit (Protocol Data Unit, PDU) or other types of resource formats. For a certain radio bearer (corresponding to a PDCP entity), the PDCP data unit can be sent through one or more logical channels (Logical Channel, LCH) on the RLC entity. For example, FIG. 4A is a schematic diagram illustrating that data copying is not implemented according to an embodiment of the present invention. Referring to FIG. 4A, the uplink is taken as an example. Two data units for a certain radio bearer RB1 are respectively transmitted through logical channels LCH1 and LCH2 of two RLC entities RLC1 and RLC2. If under Carrier Aggregation (CA), two component carriers (Component Carriers, CCs) CC1 and CC2 provided by one IAB-node 10 or IAB-supplier 30 (if there is a decentralized unit function) can be used separately Send these two data units.

The difference with single data is that data replication can correspond to a data unit (or the same type of traffic) of PDCP to a base station (for example, IAB-node 10 or IAB-supplier 30) provided by the IAB mechanism. Two or more of the component carriers. For example, FIG. 4B is a schematic diagram illustrating the implementation of data copying according to an embodiment of the present invention. Referring to FIG. 4B, the RLC entity RLC1 and its logical channel LCHn can be responsible for a copy of a data unit (ie, a copied data unit). In addition, the data unit and its copy will be respectively transmitted through the component carriers CC1 and CC2 (corresponding to a MAC entity MAC1 or a base station). It can be seen that the same data unit may be transmitted twice, one of which is through the logical channel LCHn of the RLC entity RLC1, and the other time is through the logical channel LCH2 of the RLC entity RLC2. In this way, the reliability can be increased and the time delay can be reduced.

It should be noted that only two RLC entities RLC1 and RLC2 are taken as examples in FIGS. 4A and 4B. In other embodiments, there may be more RLC entities, more logical channels, or more constituent carriers. In addition, the aforementioned PDCP data unit refers to a data protocol data unit (data PDU).

In addition, in order to let the IAB-node 10 or the IAB-provider 30 know that the user equipment 100 supports CA and IAB mechanisms. The processor 160 can notify the MAC data unit (for example, PDU or other data unit format) of the MAC on the data plane through the transmitter 130 to comply with the CA and IAB mechanism, so as to reduce the control signaling cost.

FIG. 5 illustrates the structure of the data unit of the media access control (MAC) according to an embodiment of the invention. Please refer to FIG. 5, the PDU of the MAC may include four types of sub-data units. The first sub-data unit 510 includes a sub-header (subheader) 511 and a service data unit (Service Data Unit, SDU) 513. The second sub-data unit 530 includes a sub-header 531 and a first control element (CE) 533 with a fixed length. The third sub-data unit 550 includes a sub-header 551 and a variable-length second CE 553. The fourth data unit 560 includes padding data.

The user equipment 100 can notify the IAB-node 10 or the IAB-provider 30 about supporting/conforming to CA and IAB mechanisms through, for example, the first CE 533 or the second CE 553. For example, the logical channel identity (LCID) field (filed) indicates the content to be notified. Table (1) is the value of the LCID column in the standard: Table (1) index LCID value index LCID value 0 Common Control Channel (CCCH) 57 Single entry PHR 1-32 Logical channel identification code 58 Cellular Radio Temporary Identity (C-RNTI) 33-51 Keep 59 Short truncated BSR 52 CCCH 60 Long truncated BSR 53 Recommended bit rate inquiry 61 Short BSR 54 Multi-entry Power Grace Report (PHR) 62 Long BSR 55 Confirmed by configuration 63 filling 56 Multi-entry PHR Among them, the reserved place (for example, index 33-51) can be replaced with instructions that comply with the CA and IAB mechanisms. It should be noted that, in other embodiments, the instructions complying with the CA and IAB mechanisms may also be in other fields or other data in the header.

Next, the processor 160 triggers two or more buffer status reports for each PDCP data unit (step S330). Specifically, each buffer status report corresponds to a logical channel. Fig. 6 is a flow chart illustrating the triggering of the buffer status report according to an embodiment of the new creation. Referring to FIG. 6, the processor 160 confirms whether the CA and IAB mechanisms are triggered (step S610). For example, whether the instructions complying with the CA and IAB mechanisms have been transmitted. If the CA and IAB mechanisms are not triggered, the processor 160 only needs to execute a single BSR. For example, the data in FIG. 4A is not copied, and a data unit is only transmitted through one logical channel, so the BSR trigger of the MAC entity MAC1 only needs to trigger a single BSR for this data unit. If the CA and IAB mechanisms have been triggered, the processor 160 executes multiple BSR (step S330). For example, the data in FIG. 4B is copied, and the data unit and its copy are respectively transmitted through different logical channels, so the BSR trigger of a single MAC entity MAC1 must trigger the BSR for this data unit and its copy. In other words, the base station needs to report the data volume of the data unit and its copies to be transmitted.

It is also worth noting that those buffer status reports respectively correspond to a logical channel in a different logical channel group (Logical Channel Group, LCG). Taking FIG. 4B as an example, the logical channel LCH2 and the logical channel LCHn belong to different logical channel groups. That is, the user equipment 100 reports the BSR based on the logical channel group. In some embodiments, logical channels with the same service quality or priority may be classified into the same logical channel group, but they can still vary according to actual needs.

It should be noted that FIG. 4B only takes one copy as an example. In other embodiments, there may be more copies.

If the uplink resource has been allocated, the processor 160 may send a BSR indicating the data volume of the data unit and its copy through the transmitter 130. This BSR may be a periodic or regular BSR. If the uplink resource has not been assigned, the processor 160 may send a scheduling request (SR) through the transmitter 130 to request resources to transmit the BSR.

In response to the transmission of the BSR, the processor 160 may determine whether the cancellation condition is met, and cancel the buffer status report on at least one of the logical channels according to the cancellation condition (step S350). Specifically, whether the uplink resource related to the cancellation condition is obtained or not. The processor 160 can determine whether the uplink resource assigned by the IAB-node 10 can accommodate the pending data unit (but may not be sufficient or sufficient to accommodate the MAC CE of the BSR and its sub-headers). If the uplink resource can accommodate the data unit to be transmitted (that is, the uplink resource has been obtained), the processor 160 may cancel the buffer status report on at least one of the logical channels. Taking FIG. 4B as an example, the processor 160 can cancel the triggered BSR on the logical channel LCHn by stopping the periodic BSR timer (periodicBSR-Timer) or the retransmission BSR timer (retxBSR-Timer). The processor 160 may also cancel the logical channel LCH2 in another logical channel group. Alternatively, the processor 160 cancels the logical channels of all logical channel groups.

In another embodiment, the processor 160 may also start a counter to record the number of times the BSR is transmitted for a specific resource unit. If the number of times recorded by the counter exceeds the threshold value but the corresponding uplink resources are still not obtained (maybe due to channel problems or network failures) (that is, the uplink resources are not obtained), the processor 160 may cancel the logical channels in those logical channels. Buffer status report on at least one.

Fig. 7 is a flowchart illustrating triggering scheduling requirements according to an embodiment of the new creation. Referring to FIG. 7, the BSR is cancelled or there is still other data to be transmitted on the logical channel, and the processor 160 may trigger a scheduling request (SR) (step S710). SR is used to request uplink resources for new transmissions. The processor 160 may receive the scheduling requirement configuration through the receiver 120, and map the scheduling requirement configuration to one or more logical channel-numerology pairs (step S730). One logical channel may correspond to one or more parameter sets (respectively corresponding to subcarrier space or resource grid in the frequency domain). Any logical channel and its corresponding parameter set can be called a logical channel-parameter set pair.

…(1) The processor 160 may configure and transmit the SR corresponding to the to-be-transmitted traffic according to the scheduling requirement (step S750). It is worth noting that the scheduling of the SR corresponding to the scheduling requirement configuration is based on the capacity of the data unit of the MAC and the type of data to be transmitted. For example, the processor 160 may schedule a plurality of SRs for different traffic based on an Unbounded Knapsack solution. Suppose that the user equipment 100 receives a given MAC PDU of a specific capacity size C , and intends to put m types of scheduling request configurations (corresponding to different data types respectively, and related to such as channel quality indicators (Channel Quality Indicator, CQI) Or other priority indicators). In addition, suppose that the i-th type of traffic has copied data (that is, the copy obtained using the aforementioned data copy mechanism), the priority p[i] of the i-th type of data and its data size w[i] ( i , C , m , p[i] , and w[i] can be positive integers, and it can be assumed that the number of copies of each type is unlimited). One piece of traffic occupies one MAC SDU. For i is 1~ m , it can determine how much x _i of the i-th type of traffic can be selected into the MAC PDU, and the maximum benefit can be obtained without exceeding the capacity C (for example, the higher the priority The better, and the lower the priority, the worse):

…(1)

In other embodiments, the SR schedule may also be derived from other optimization solutions. In some embodiments, the user equipment 100 may also use SR to communicate the service type of the traffic (for example, Enhanced Mobile Broadband (eMBB), Massive Machine-Type Communications (mMTC), Ultra-reliable low-latency communications (Ultra Reliable Low Latency Communications, URLLC), fifth-generation (5G) or other generations of mobile communications technologies) are reported back to IAB-node 10 or IAB-provider 30.

Next, the processor 160 determines whether the number of transfers of the SR (for example, SR_counter) exceeds the upper limit of the number of transfers (for example, dsr-TransMax) (step S770). If the number of transmissions has not exceeded the upper limit of the number of transmissions and the grant of uplink resources (for example, UL grant) has not yet been received, the processor 160 resends the SR (return to step S710). If the number of transmissions exceeds the upper limit of the number of transmissions, the processor 160 may determine that it has lost connection or synchronization with the IAB-node 10, and initiates a random access (RA) procedure accordingly (step S790).

From this, it can be seen that the new authoring embodiment can provide a multi-BSR cancellation mechanism under the CA and IAB mechanisms. For the IAB mechanism, it can also provide improved post-access multiplexing, multiple connectivity, and improved service quality on multiple hops.

FIG. 8 is a schematic diagram of a communication system 1 according to an embodiment of the invention. Referring to FIG. 8, for the architecture of applying the IAB mechanism, the IAB-node 10 in the communication system 1 may include gNB function 11, user plane function (UPF) 13, and mobile terminal (MT) function 15, and IAB -The provider 30 may include the gNB function 31 and the UPF function 35. In this way, a PDU session 23 for a specific radio bearer 21 can be connected to an IAB-supplier 30 through one or more IAB-nodes 10. In addition, the inventive embodiment of the present invention provides a hardware controller that can run a Network Functions Virtualization Infrastructure (NFVI) manager and virtualization software. The network function virtualization platform can apply carrier-grade functions to manage or monitor platform components, recover abnormal errors, and provide effective information security management.

In summary, in the user equipment and communication system of the creative embodiment of the present invention, under the condition that the IAB-node provides CA, the data unit is used to report that the condition is met, so as to reduce the signaling cost. In addition, the novel authoring embodiment can efficiently report multiple BSR forms in the same MAC entity. The inventive embodiment of the present invention also performs MAC SDU/SR scheduling earlier for NR user equipment, thereby increasing the success rate of the user equipment sending SR after the BSR is cancelled, thereby reducing the time delay of uplink data.

Although the creation of this new type has been disclosed in the above embodiments, it is not intended to limit the creation of this new type. Anyone with ordinary knowledge in the technical field can make some changes and changes without departing from the spirit and scope of the creation of the new type. Retouching, so the scope of protection of the creation of this new model shall be subject to the scope of the attached patent application.

1: Communication system 10: IAB-node 30: IAB-provider 50: core network entity 100: user equipment AL: access link BL: Backhaul link 120: receiver 130: Teleporter 140: Analog-to-digital and digital-to-analog converters 150: storage 160: processor S310~S350, S310~S630, S710~S790: steps RB1: radio bearer PDCP1: PDCP entity RLC1, RLC2: RLC entity LCH1, LCH2, LCHn: logical channels MAC1: MAC entity 510: The first sub-data unit 511, 531, 551: sub-header 513: Service Information Unit 530: The second sub-data unit 533: The first control element 550: The third sub-data unit 553: Second Control Element 560: The fourth sub-data unit 11.31: gNB function 13, 35: UPF function 15: MT function 21: Carrying 23: Packet data unit conversation

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the invention. Fig. 2 is a block diagram of components of a user equipment according to an embodiment of the invention. Fig. 3 is a flowchart of a method for canceling a buffer status report according to an embodiment of the present invention. FIG. 4A is a schematic diagram illustrating that data copying is not implemented according to an embodiment of the creation of the present invention. Fig. 4B is a schematic diagram illustrating the implementation of data copying according to an embodiment of the new creation. FIG. 5 illustrates the data unit structure of Media Access Control (Media Access Control) according to an embodiment of the present invention. Fig. 6 is a flow chart illustrating the triggering of the buffer status report according to an embodiment of the new creation. Fig. 7 is a flowchart illustrating triggering scheduling requirements according to an embodiment of the new creation. Fig. 8 is a schematic diagram of a communication system according to an embodiment of the invention.

1: Communication system

10: IAB-node

30: IAB-provider

50: core network entity

100: user equipment

AL: access link

BL: Backhaul link

Claims (10)

A communication system including: A base station, suitable for an Integrated Access and Backhaul (IAB) mechanism; and A user equipment configured to: A data duplication is enabled for at least one first data unit of a packet data convergence protocol (Packet Data Convergence Protocol, PDCP), wherein the data duplication is a carrier aggregation (Carrier Aggregation, CA). The first data unit corresponds to at least two component carriers (CCs) provided by the base station of the integrated access and backhaul mechanism; Trigger at least two buffer status reports (Buffer Status Report, BSR) for each of the first data units, wherein each of the buffer status reports corresponds to a logical channel (Logical Channel, LCH); and Cancel the buffer status report on at least one of the at least two logical channels according to a cancellation condition. The communication system according to claim 1, wherein the at least two buffer status reports respectively correspond to one of the logical channels in different logical channel groups (Logical Channel Group, LCG). The communication system according to claim 1, wherein the user equipment determines that the assigned uplink resource accommodates the first data unit to be transmitted, and cancels the buffer status report on at least one of the at least two logical channels. The communication system according to claim 1, wherein the user equipment notifies that the carrier aggregation and the integrated access conform to the second data unit of the media access control (Media Access Control, MAC) on the data plane And post-transmission mechanism. The communication system according to claim 1, wherein the user equipment further receives a scheduling request (Scheduling Request, SR) configuration (Scheduling Request, SR) configuration, and transmits according to the scheduling request configuration corresponding to at least one to-be-transmitted traffic At least one scheduling request is given to the base station, wherein the scheduling request configuration is obtained based on the capacity of the second data unit of the media access control and the data type of the at least one to-be-transmitted traffic. A user equipment including: A transmitter, which transmits signals; A processor, coupled to the transmitter, and configured to: A data copy is enabled for at least one first data unit of a packet data aggregation protocol, where the data copy is to correspond to a first data unit under a carrier aggregation to a base station location with an integrated access and backhaul mechanism Provide at least two component carriers; Triggering at least two buffer status reports for each of the first data units, wherein each of the buffer status reports corresponds to a logical channel, and at least two of the buffer status reports are transmitted through the transmitter; and Cancel the buffer status report on at least one of the at least two logical channels according to a cancellation condition. The user equipment according to claim 6, wherein the at least two buffer status reports respectively correspond to one of the logical channels in different logical channel groups. The user equipment according to claim 6, wherein the cancellation condition is related to expiration of a timer, the timer is related to whether the radio resource is obtained or not, and the processor is further configured to: Start the timer; and It is determined that the timer has expired, and the buffer status report on at least one of the at least two logical channels is cancelled. The user equipment according to claim 6, wherein the processor is further configured to: The second data unit of the media access control at the data level is notified by the transmitter to comply with the carrier aggregation and the integrated access and post-transmission mechanism. The user equipment described in claim 6 further includes: A receiver is coupled to the processor and receives signals, wherein the processor is further configured to: Receiving a scheduling request configuration through the receiver, wherein the scheduling request configuration is derived based on the capacity of the second data unit of the media access control and the type of data to be transmitted; and According to the scheduling request configuration, at least one scheduling request corresponding to the to-be-transmitted traffic is transmitted through the transmitter.

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