TWI616078B - Communication system, communication device and method thereof for d2d communications - Google Patents

Abstract

A method for transmitting complex data packets in a wireless network. The method includes receiving one or more first Medium Access Control (MAC) Protocol Data Units (PDUs) including a plurality of Radio Link Control (RLC) PDUs from a source user equipment (UE) And transmitting to a destination UE; demultiplexing the first MAC PDU according to a header field of each first MAC PDU to retrieve the RLC PDU; according to one or more MAC PDU sizes by one or more Multiple RLC PDU segments are generated in the foregoing RLC PDUs or a plurality of relay RLC (RRLC) PDUs are generated from all the foregoing RLC PDUs, where the RRLC is a protocol layer between a MAC layer and an RLC layer; And operating the RLC PDU and the RLC PDU segment or the RRLC PDU as one or more second MAC PDUs; and transmitting the second MAC PDU to the destination UE.

Description

Communication system, communication device and method for D2D communication

The disclosure relates to a communication device, a method for transmitting a complex data packet and receiving a plurality of data packets, and a device for allocating a User-to-User (UE) device-to-device (D2D) communication resource. Method, and a communication system for D2D communication.

Nowadays, mobile phones and tablets are widely used and high-capacity multimedia communication is activated, so the amount of mobile transmission is rapidly increasing. The amount of mobile traffic is expected to continue to increase in the future, doubling each year. Since most mobile transmissions are transmitted through a base station, communication service providers are currently facing severe network overload. In order to handle the increase in transmission volume, communication service providers have increased investment in network equipment and commercialized next-generation mobile communication standards (such as WiMAX and Long Term Evolution (LTE), etc.) in an effort to efficiently handle the transmission volume. high capacity. However, in order to more quickly carry the expected increase in throughput, it is time to seek other solutions.

Device-to-Device (D2D) communication is a communication technology that is directly transmitted between adjacent nodes. In a D2D communication environment, each node, such as a mobile terminal, searches for another user device that is actually adjacent to the corresponding node. Establish a communication session and then transfer the amount of transmission. Therefore, since D2D communication can help solve the problem of overloaded transmission on a base station, D2D communication is concerned as the basic technology of the latter 4G, the next generation of mobile communication. This standard organization 3GPP, IEEE, etc. promotes the development of a D2D communication standard based on LTE-A or Wi-Fi. Many companies are also developing independent D2D communication technologies.

The following summary is merely exemplary and is not intended to be limiting in any way. The exemplary embodiments are further described in the following disclosure. Therefore, the following summary is not intended to identify essential features of the claimed subject matter, and is not intended to limit the scope of the claimed subject matter.

The disclosure provides a communication device, a method for transmitting a plurality of data packets and receiving a plurality of data packets, and a method for allocating a device-to-device (D2D) communication resource for a plurality of user equipments (UEs). And a communication system for D2D communication.

In an exemplary embodiment, the present disclosure is directed to a communication device for transmitting a plurality of data packets in a wireless network. The communication device includes at least a control circuit, a processor and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving one or more first Medium Access Control (MAC) Protocol Data Units (PDUs), a radio link control (RLC) PDU, the RLC PDU is from a source device (UE) of the wireless network, and is expected to be transmitted to a destination UE; A header field solution for the MAC PDU Demultiplexing the first MAC PDU to retrieve the RLC PDU; generating a plurality of RLC PDU segments from one or more of the RLC PDUs according to one or more MAC PDU sizes or generating a plurality of the foregoing RLC PDUs Relay RLC (RRLC) PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; multiplexing the RLC PDU and the RLC PDU segment or the RRLC The PDU is one or more second MAC PDUs; and the foregoing second MAC PDU is transmitted to the destination UE.

In some embodiments, one of the foregoing RLC PDU segments re-segmentates one of the RLC PDUs according to one of the MAC PDU sizes and adds a re-segmentation information to one of the RLC PDUs. Produced in a header field. In some embodiments, the RRLC PDU is generated by concatenating and concatenating the RLC PDU according to the MAC PDU size and adding a header including a split and link information to each RRLC PDU. In some embodiments, the MAC PDU size is obtained based on one or more resource grants transmitted by a base station. In some embodiments, the RLC PDU and the RLC PDU segment or the RRLC PDU are multiplexed into the second MAC PDU according to a priority order. In some embodiments, the prioritization is based on a First-in First-out (FIFO) principle or a Quality of Service (QoS) parameter.

In an exemplary embodiment, the present disclosure is directed to a method for transmitting a plurality of data packets in a wireless network. The above method is used in a communication device. The method includes the steps of: receiving one or more first Medium Access Control (MAC) Protocol Data Units (PDUs) including a plurality of Radio Link Control (RLC) PDUs , The RLC PDU is sent from a source device (User Equipment, UE) of the wireless network and is expected to be transmitted to a user equipment (User Equipment, UE); according to a header column of each first MAC PDU. Demultiplexing the first MAC PDU to retrieve the RLC PDU; generating a plurality of RLC PDU segments from one or more of the RLC PDUs according to one or more MAC PDU sizes or from all of the foregoing RLC PDUs Generating a Relay RLC (RRLC) PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; multiplexing the RLC PDU and the RLC PDU segment or The RRLC PDU is one or more second MAC PDUs; and the foregoing second MAC PDU is transmitted to the destination UE.

In some embodiments, one of the foregoing RLC PDU segments re-segmentates one of the RLC PDUs according to one of the MAC PDU sizes and adds a re-segmentation information to one of the RLC PDUs. Produced in a header field. In some embodiments, the RRLC PDU is generated by concatenating and concatenating the RLC PDU according to the MAC PDU size and adding a header including a split and link information to each RRLC PDU. In some embodiments, the MAC PDU size is obtained based on one or more resource grants transmitted by a base station. In some embodiments, the RLC PDU and the RLC PDU segment or the RRLC PDU are multiplexed into the second MAC PDU according to a priority order. In some embodiments, the prioritization is based on a First-in First-out (FIFO) principle or a Quality of Service (QoS) parameter.

In an exemplary embodiment, the present disclosure is directed to a communication device for transmitting a plurality of data packets in a wireless network. The above communication device is at least The utility model comprises a control circuit, a processor and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving and directly receiving a source from the wireless network through a relay user equipment (User Equipment, UE) One or more Medium Access Control (MAC) Protocol Data Units (PDUs) of the UE, wherein the MAC PDUs are composed of a Radio Link Control (RLC) PDU and a plurality of RLCs. PDU segmentation; demultiplexing the MAC PDU according to a header field of each MAC PDU to retrieve the RLC PDU and the RLC PDU segment; according to Transmission Sequence Numbers (TSNs) Reordering the RLC PDU and the RLC PDU segment, and performing a repetition detection of the RLC PDU and the RLC PDU segment, wherein each transmission sequence number is included in each RLC PDU and one of each RLC PDU segment And merging the RLC PDU and the RLC PDU segment into the plurality of RLC service data by using the information included in each of the RLC PDUs and the foregoing header field of each of the RLC PDU segments Yuan (Service Data Unit, SDU).

In an exemplary embodiment, the present disclosure is directed to a communication device for transmitting a plurality of data packets in a wireless network. The communication device includes at least a control circuit, a processor and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving, by a relay user equipment (UE) and a base station, a plurality of UEs from the source UE of the wireless network. First media access control (Medium Access Control, MAC) protocol data unit (PDU), wherein the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs, wherein the RRLC PDU is a MAC a PDU of a protocol layer between the layer and the RLC layer, and directly receiving a plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is composed of a plurality of first RLC PDUs and a plurality of first RLC PDU segments Demultiplexing the first MAC PDU according to a header field of each first MAC PDU to retrieve the RRLC PDU, and demultiplexing according to a header field of each second MAC PDU The second MAC PDU is operated to capture the first RLC PDU and the first RLC PDU segment; the RRLC PDU is reordered according to Transmission Sequence Numbers (TSNs), and a repeated detection of the RRLC PDU is performed, Each of the transmission sequence numbers is included in a header field of each of the RRLC PDUs; the RRLC PDU is reassembled to the plurality of second RLC PDUs and the plurality of bits using the information of the header fields included in each of the RRLC PDUs Second RLC PDU segment; according to the above Retrieving the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment, and performing the foregoing first RLC PDU, the first RLC PDU segment, and the foregoing a repeated detection of the second RLC PDU and the second RLC PDU segment, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and the use is included in each of the above Recombining the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment into an RLC PDU and information in the foregoing header field of each RLC PDU segment Complex RLC Service Data Unit (SDU).

In an exemplary embodiment, the disclosure relates to a A method of receiving a plurality of data packets in a line network. The above method is used in a communication device. The method includes the following steps: receiving, by a user equipment (UE), a base station, and directly receiving one or more media access control (Medium Access Control) from a source UE of the wireless network. , MAC) Protocol Data Unit (PDU), wherein the MAC PDU is composed of a plurality of Radio Link Control (RLC) PDUs and a plurality of RLC PDU segments; according to one of each MAC PDU The header field demultiplexes the MAC PDU to retrieve the RLC PDU and the RLC PDU segment; reorders the RLC PDU and the RLC PDU segment according to Transmission Sequence Numbers (TSNs), and performs a repetition detection of the RLC PDU and the RLC PDU segment, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and the use is included in each of the RLCs The PDU and the information in the header field of each of the RLC PDU segments are used to reassemble the RLC PDU and the RLC PDU segment into a plurality of RLC Service Data Units (SDUs).

In an exemplary embodiment, the present disclosure is directed to a method for receiving a plurality of data packets in a wireless network. The above method is used in a communication device. The method includes the following steps: receiving, by a relay user equipment (UE) and a base station, a plurality of first medium access control (MAC) protocols from a source UE of the wireless network. a data unit (PDU), wherein the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs, wherein the RRLC PDU is a protocol between a MAC layer and an RLC layer. Layer PDU, and directly receiving a plurality of second MAC PDUs from the source UE, where the second MAC The PDU is composed of a plurality of first RLC PDUs and a plurality of first RLC PDU segments; demultiplexing the first MAC PDU according to a header field of each first MAC PDU to retrieve the RRLC PDU And multiplexing the second MAC PDU according to a header field of each second MAC PDU to retrieve the first RLC PDU and the first RLC PDU segment; according to the transmission sequence number (TSNs) Reordering the above RRLC PDUs and performing a repeat detection of the RRLC PDUs described above, wherein each transmission sequence number is included in one of the header fields of each RRLC PDU; using the above-mentioned labels included in each of the RRLC PDUs described above The header field information is used to recombine the RRLC PDU to the plurality of second RLC PDUs and the plurality of second RLC PDU segments; and reordering the first RLC PDU, the first RLC PDU segment, and the second RLC PDU according to the foregoing transmission sequence number And the second RLC PDU segment, and performing a repeated detection of the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment, wherein each transmission sequence number is Included in each RLC PDU and each RLC PDU Recombining the first RLC PDU, the first RLC PDU segment, in a header field of one of the segments; and using information included in each of the RLC PDUs and the header field of each of the RLC PDU segments And the second RLC PDU and the second RLC PDU are segmented into a plurality of RLC Service Data Units (SDUs).

In an exemplary embodiment, the present disclosure is directed to a method of allocating Device-to-Device (D2D) communication resources for a plurality of User Equipments (UEs). The above method is used in a base station. The method includes the following steps: receiving channel state information reported by the UE; estimating link quality of all D2D communication pairs according to the channel state information; determining a suitable D2D communication mode of each D2D communication pair according to the link quality ; And allocating physical resource blocks (Physical Resource Blocks, PRBs) according to the above link quality.

In some embodiments, the method further includes: determining whether there is at least one D2D communication pair to which no PRB is allocated; and when determining the at least one D2D communication pair having no PRB assigned, increasing according to a data rate and the foregoing A D2D communication pair shares the above allocated PRB. In some embodiments, the above-mentioned suitable D2D communication mode is between a source UE and a destination UE, and between the source UE and the destination UE through a relay UE or through the base station. A connection combination between the source UE and the destination UE.

In an exemplary embodiment, the present disclosure is directed to a communication system for Device-to-Device (D2D) communication in a wireless network. The communication system includes at least one source device (User Equipment, UE), a destination UE, a relay UE, and a base station. The base station receives channel status information reported by the source UE, the destination UE, and the relay UE. The base station estimates the link quality of all D2D communication pairs according to the channel state information, determines a suitable D2D communication mode from the source UE to the destination UE according to the link quality, and transmits a resource grant (resource) Granting to the source UE to indicate that the source UE transmits a data packet to the destination UE in the suitable D2D communication mode; wherein the suitable D2D communication mode is between the source UE and the destination UE And connecting, by the relay UE, a connection between the source UE and the destination UE or the base station between the source UE and the destination UE.

In some embodiments, the foregoing suitable D2D communication mode is the foregoing connection group between the source UE and the destination UE through the relay UE. The relay UE further includes at least: a control circuit, a processor, and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving one or more first Medium Access Control (MAC) Protocol Data Units (PDUs), Including a plurality of Radio Link Control (RLC) PDUs from the source UE of the wireless network and expected to be transmitted to the destination UE; according to a header field solution of each first MAC PDU Demultiplexing the first MAC PDU to retrieve the RLC PDU; generating a plurality of RLC PDU segments from one or more of the RLC PDUs according to one or more MAC PDU sizes or generating a plurality of the foregoing RLC PDUs Relay RLC (RRLC) PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; and is multiplexed according to a first-in first-out (FIFO) principle. And multiplexing the RLC PDU and the RLC PDU segment or the RRLC PDU as one or more second MAC PDUs; and transmitting the second MAC PDU to the destination UE. In some embodiments, the destination UE further includes at least: a control circuit, a processor, and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving, by the relay UE, the base station, and directly receiving one or more media access control from the source UE (Medium Access Control, MAC) Protocol Data Unit (PDU), wherein the MAC PDU is composed of a plurality of Radio Link Control (RLC) PDUs and a plurality of RLC PDU segments; according to one of each MAC PDU Header bar Demultiplexing the MAC PDU to extract the RLC PDU and the RLC PDU segment; reordering the RLC PDU and the RLC PDU segment according to Transmission Sequence Numbers (TSNs), and executing the RLC PDU and the foregoing a repeat detection of RLC PDU segments, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and the use of each of the RLC PDUs included in each of the above The information in the above header field of the RLC PDU segment reassembles the RLC PDU and the RLC PDU segment into a plurality of RLC Service Data Units (SDUs). In some embodiments, the destination UE further includes at least: a control circuit, a processor, and a memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor. The processor is configured to execute a code stored in the memory to perform: receiving, by the relay UE and the base station, a plurality of first medium access control (MAC) from the source UE a protocol data unit (PDU), wherein the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs, wherein the RRLC PDU is between a MAC layer and an RLC layer. a PDU of the protocol layer, and directly receiving a plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is composed of a plurality of first RLC PDUs and a plurality of first RLC PDU segments; Decoding a first MAC PDU to retrieve the RRLC PDU, and demultiplexing the second MAC PDU according to a header field of each second MAC PDU. Extracting the first RLC PDU and the first RLC PDU segment; reordering the RRLC PDU according to Transmission Sequence Numbers (TSNs), and performing a repeated detection of the RRLC PDU, where each transmission The sequence number is included in a header field of one of the RRLC PDUs; the RRLC PDU is reassembled to the second and second RLC PDUs using the information of the header field included in each of the RRLC PDUs Segmenting; reordering the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment according to the foregoing transmission sequence number, and executing the first RLC PDU and the first RLC PDU a repeating detection of the segment, the second RLC PDU, and the second RLC PDU segment, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; Recombining the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second by using information included in each of the RLC PDUs and each of the foregoing header fields of each RLC PDU segment The RLC PDU is segmented into a plurality of RLC Service Data Units (SDUs). In some embodiments, the suitable D2D communication mode is the foregoing connection combination between the source UE and the destination UE through the base station, and the base station further includes: a control circuit, a processor, and A memory. The above processor is provided in the above control circuit. The memory is disposed in the control circuit and coupled to the processor; wherein the processor is configured to execute a code stored in the memory to perform: receiving one or more first media access controls (Medium) Access Control (MAC) protocol data unit (PDU), which includes a plurality of Radio Link Control (RLC) PDUs, and the RLC PDUs are from a source device of the wireless network (User Equipment) And UE) is expected to be transmitted to a destination UE; the first MAC PDU is multiplexed according to a header field of each first MAC PDU to retrieve the RLC PDU; according to one or more MAC PDU sizes Generating multiple RLC PDU segments in one or more of the above RLC PDUs or by all of the above A plurality of relay RLC (Relay RLC, RRLC) PDUs are generated in the RLC PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; according to a first-in first-out (First-in First-out, FIFO) principle or quality of service (QoS) parameter multiplexing (multiplex) the above RLC PDU and the above RLC PDU segment or the RRLC PDU as one or more second MAC PDUs; and transmitting the second MAC PDU To the above-mentioned destination UE.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the preferred embodiments are described in detail with reference to the accompanying drawings.

200‧‧‧Communication device

202‧‧‧ Input device

204‧‧‧Output device

206‧‧‧Control circuit

208‧‧‧Central Processing Unit

210‧‧‧ memory

212‧‧‧ Code

214‧‧‧ transceiver

300‧‧‧Application layer

302‧‧‧ third floor

304‧‧‧ second floor

306‧‧‧ first floor

400‧‧‧Information flow chart

S405, S410, S415, S420, S425, S430‧‧ steps

500‧‧‧ Radio Protocol Stack

510‧‧‧Source UE

520‧‧‧ destination UE

512, 522‧‧‧PDCP

514, 524‧‧‧RLC

516, 526‧‧‧MAC

518, 528‧‧‧PHY

800‧‧‧RF protocol stack

830‧‧‧Relay UE

832‧‧‧RRLC

834‧‧‧MAC

1000‧‧‧Radio Protocol Stack

1030‧‧‧Relay UE

1032, 1022‧‧‧RRLC

1036‧‧‧MAC

1200‧‧‧ Radio Protocol Stack

1240‧‧‧eNB

1232‧‧‧RRLC

1246‧‧‧MAC

1300‧‧‧ Radio Protocol Stack

1340‧‧‧eNB

1332, 1322‧‧‧RRLC

1346‧‧‧MAC

1400‧‧‧flow chart

S1405, S1410, S1415, S1420, S1425‧‧‧ steps

1500‧‧‧flow chart

S1505, S1510, S1515, S1520‧‧‧ steps

1600‧‧‧flow chart

S1605, S1610, S1615, S1620, S1625‧‧‧ steps

1700‧‧‧Community

1900‧‧‧ functional block diagram

1910, 1905, 1915, 1920‧‧‧ squares

2300

S2305, S2310, S2315, S2320‧‧‧ steps

Figure 1A shows an example of a D2D communication direct path mode without the participation of intermediate nodes.

Figure 1B shows an example of one of the relay path modes of D2D communication.

Figure 1C shows an example of one of the local routing modes of D2D communication.

FIG. 2 is a simplified functional block diagram of a communication device according to an embodiment of the present disclosure.

Figure 3 is a simplified functional block diagram showing the execution of code in Figure 2, in accordance with an embodiment of the present disclosure.

FIG. 4 is a flow chart showing the message that a source UE transmits a data packet to a destination UE through different D2D communication modes according to an embodiment of the disclosure.

FIG. 5 is a diagram showing a Radio Protocol Stack for transmitting a data packet direct path mode between a source UE and a destination UE according to an embodiment of the present disclosure.

FIG. 6 is a schematic diagram showing one of RLC SDU connection and segmentation according to an embodiment of the present disclosure.

Figure 7 is a diagram showing one of the re-segmentation of one of the RLC PDUs according to an embodiment of the present disclosure.

Figure 8 is a diagram showing a radio protocol stack in a relay path mode for transmitting data packets between a source UE and a destination UE by using a relay UE according to an embodiment of the present disclosure.

Figure 9 is a diagram showing an example of processing a data packet by a relay UE in accordance with an embodiment of the present disclosure.

Figure 10 is a diagram showing a radio protocol stack in a relay path mode for transmitting data packets between a source UE and a destination UE by using a relay UE according to an embodiment of the present disclosure.

Figure 11 is a diagram showing another example of processing a data packet by a relay UE in accordance with another embodiment of the present disclosure.

Figure 12 is a diagram showing a radio protocol stack of a relay path pattern for transmitting data packets between a source UE and a destination UE via an eNB according to an embodiment of the present disclosure.

Figure 13 is a diagram showing a radio protocol stack of a relay path pattern for transmitting data packets between a source UE and a destination UE via an eNB according to an embodiment of the present disclosure.

Figure 14 is a flow chart showing a method for transmitting a plurality of data packets in a wireless network according to an embodiment of the present disclosure.

Figure 15 is a flow chart showing a method for transmitting a plurality of data packets in a wireless network according to an embodiment of the present disclosure.

Figure 16 is a flow chart showing a method for transmitting a plurality of data packets in a wireless network according to an embodiment of the present disclosure.

Figure 17 is a diagram showing one of D2D communication having a communication mode in an LTE-A system according to an embodiment of the present disclosure.

Figure 18 is a diagram showing the principle of transmission data rate estimation in three D2D communication modes during each subframe according to an embodiment of the present disclosure.

Figure 19 is a functional block diagram showing a scheduling procedure according to an embodiment of the present disclosure.

Figure 20 is a flow chart showing a mode selection procedure for all D2D communication pairs performed by an eNB according to an embodiment of the present disclosure.

Figure 21 is a flow chart showing a first stage PRB allocation in a scheduling algorithm according to an embodiment of the present disclosure.

Figure 22 is a diagram showing an example of a two-dimensional optimal reuse partner seeking procedure performed by an eNB in a second-stage resource allocation according to an embodiment of the present disclosure.

Figure 23 is a flow chart showing a method for a plurality of user equipments (UEs) for allocating D2D communication resources according to an embodiment of the present disclosure.

Exemplary embodiments of the present disclosure are described in sufficient detail to enable those skilled in the art to implement and practice the disclosure. It is important to understand that the exemplary embodiments of the present disclosure can be implemented in many alternative forms and should not be It is to be construed as being limited only by the exemplary embodiments disclosed herein.

Accordingly, while the present disclosure may be susceptible to various modifications and alternative forms, the specific embodiments are illustrated in the drawings and are described in detail herein. It should be understood, however, that the invention is not limited to the specific forms disclosed. Rather, the invention is to cover all modifications, equivalents, and alternatives. The same reference numerals are used in the drawings to refer to the same elements.

It will be understood that, although the terms first, second, A, B, etc. may be used as a reference to the present disclosure, such elements are not limited by these terms. For example, a first element could be termed a second element, and a second element could be termed a first element without departing from the scope of the disclosure. The term "and/or" as used herein includes any and all combinations of one or more of the objects.

It will be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or the intervening element can be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there is no intervening element. Other words used to describe the relationship between components should be interpreted in a similar manner (ie, "between" and "directly", "adjacent" versus "directly adjacent", etc.).

The terminology used herein is for the purpose of describing particular embodiments and is not intended to The articles "a", "an" and "the" are used in the singular, and the singular singular presence. In other words, the elements referred to in the singular can refer to one or more unless the context clearly indicates the contrary. It will also be understood that the terms "comprises", "comprising", "includes" and/or "including" are used in this document. The existence of the features, the items, the steps, the operations, the elements and/or the components of the present invention, but does not exclude the presence or addition of one or more other features, items, steps, operations, elements, components and/or groups thereof.

All terms (including technical and scientific terms) used herein are to be interpreted as being used in the art unless otherwise defined. It will also be understood that commonly used terms should also be interpreted as being used in the relevant art and not intended to be ideal or too formal, unless explicitly defined herein.

The 3rd Generation Partnership Project, also known as "3GPP", is a collaborative agreement to define technical specifications for third- and fourth-generation wireless communication systems worldwide. Technical Reports. The third-generation partner program defines specifications for next-generation mobile networks, systems, and devices.

The third generation of partners plans Long Term Evolution (LTE) to improve the standards of Universal Mobile Telecommunications System (UMTS) mobile phones or mobile devices to meet future needs. In one aspect, a universal mobile communication system has been modified to provide support and evolution of Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) specifications.

At least some portions of the communication systems and methods disclosed herein may be related to 3rd Generation Partnership Project Long Term Evolution (LTE), Evolution Long Term Evolution (LTE Advanced, LTE-A) and other standards (eg, The third generation of partner programs is available in versions 8, 9, 10 and/or 11). However, the scope of the disclosure should not be limited in these respects. In at least some aspects, the communication systems and methods disclosed herein can be used in other types of wireless communication systems.

The wireless communication device can be an electronic device for communicating voice and/or transmitting data to a base station, which can communicate with a network device (for example, Public Switched Telephone Network (PSTN), Internet) Road (Internet), etc.). In the communication system and method described in the disclosure, the wireless communication device may be referred to as a mobile station, a user equipment (User Equipment, UE), an access terminal, a user using a subscriber station (Subscriber Station), a mobile terminal, and a user. The terminal, the terminal, the user use the unit, and the like. For example, the wireless communication device can be a cellular handheld device, a smart handheld device, a personal digital assistant (PDA), a notebook computer, a netbook, an e-reader, and a wireless modem (Wireless Modem). And other devices. In the third generation of partner program specifications, wireless communication devices are commonly referred to as user equipment (UE). However, the scope of this disclosure should not be limited to the third-generation partner program standards. The terms "user equipment (UE)" and "wireless communication device" can be used interchangeably in this disclosure. Communication device" common language.

In the third-generation partner program specification, the base station is generally referred to as a Node B, an evolved Node B (eNB), an enhanced Node B (enhanced eNB), and a family evolved Node B (home). Evolved Node B, HeNB), home enhanced Node B (HeNB) or other similar terms. Since the scope of this disclosure should not be limited to the third-generation partner program standards, the terms "base station", "node B", "base station" and "home base station" are used interchangeably and are indicated as being disclosed. The general term for "base station." In addition, the term "base station" can be used to mean an access point. The access point can be an electronic device that provides access to a network for wireless communication (eg, a local area network (LAN), an Internet, etc.). Can also make A wireless communication device and/or a base station, which is represented by the term "communication device".

The 1A~1C diagram is a schematic diagram of three different D2D communication modes. Figure 1A shows an example of a D2D communication direct path mode without the participation of intermediate nodes. As shown in FIG. 1A, an eNB transmits control information to a source UE (for example, UE1) and a destination UE (for example, UE 2). After the D2D communication configuration is completed, UE1 can directly send a data packet to UE2 through the direct path. Figure 1B shows an example of one of the relay path modes of D2D communication. As shown in FIG. 1B, the eNB may also transmit control information to one or more relay UEs (eg, UE3) other than UE1 and UE2. After the D2D communication configuration is completed, the UE1 can transmit the data packet to the UE2 through the relay path by using the UE3. Figure 1C shows an example of one of the local routing modes of D2D communication. As shown in FIG. 1C, the eNB may transmit control information to UE1 and UE2. After the D2D communication configuration is completed, UE1 can transmit data packets to the eNB through an uplink (UL). After the eNB receives the data packet, it does not need to transmit the data packet to the core network (Core Network, CN) to directly forward the data packet to UE2. UE2 can receive data packets from the eNB through a downlink (DL).

Next, referring to FIG. 2, FIG. 2 is a simplified functional block diagram of a communication device 200 according to an embodiment of the present disclosure. As shown in FIG. 2, the communication device 200 in a wireless communication system can be used to embody the eNB, UE1, UE2, and UE3 in FIG. 1, and the communication device can be used in a Long Term Evolution (LTE) system for a long period of time. The Evolution Advanced Technology (LTE-A) system, or other systems similar to the above, are preferred. The communication device 200 can include an input device 202, an output device 204, a control circuit 206, a central processing unit (CPU) 208, a memory 210, a code 212, and a transceiver 214. The control circuit 206 executes the code 212 in the memory 210 through the central processing unit 208, and controls The work performed in the communication device 200 is performed. The communication device 200 can receive the user input signal by using the input device 202 (such as a keyboard or a numeric keypad); the image and sound can also be output by the output device 204 (such as a screen or a speaker). The transceiver 214 is here used to receive and transmit wireless signals, to send received signals to the control circuit 206, and to wirelessly output signals generated by the control circuit 206.

Figure 3 is a simplified functional block diagram showing execution of code 212 in Figure 2, in accordance with an embodiment of the present disclosure. In this embodiment, the execution code 212 includes an application layer 300, a third layer 302, a second layer 304, and is coupled to the first layer 306. The third layer 302 generally performs radio resource control. The second layer 304 generally performs link control. The first layer 306 is generally responsible for physical connections.

Since the UE mobility and wireless channel conditions change rapidly, a suitable D2D communication mode between the source UE and the destination UE also changes. Accordingly, the present disclosure provides a radio resource scheduling algorithm to dynamically determine an appropriately suitable D2D communication mode and configure radio resources. On the other hand, how to process data packets at different nodes, such as source UE, relay UE, and destination UE, in different D2D communication modes is not mentioned in the LTE standard. Therefore, the present disclosure describes the latest operations for different D2D communication modes. This technique is described in detail as follows.

FIG. 4 is a message flow diagram 400 showing a source UE transmitting data packets to a destination UE through different D2D communication modes according to an embodiment of the disclosure. As shown in FIG. 4, when the eNB knows that the source UE wants to transmit the data packet to the destination UE, the eNB may decide to use the D2D communication according to the requirements of the network policy or the needs of the UE. In step S405, the eNB may perform a D2D communication setting procedure with the source UE and the destination UE to configure a D2D configuration, such as a measurement parameter. Then, in step S410, the source UE, the destination UE, and a relay UE can perform channel quality measurement. And report the results to the eNB.

Based on the result of the channel quality measurement, the eNB may perform a radio resource scheduling algorithm in step S415 to determine a suitable D2D communication mode between the source UE and the destination UE, and configure radio resources. A detailed description of the radio resource scheduling algorithm will be described below. In steps S420, S425, and S430, the eNB may transmit a resource grant (resource grant) to the source UE, the destination UE, and the relay UE at different times through a physical downlink control channel (PDCCH). ) to inform the appropriate D2D communication mode between the source UE and the destination UE.

For example, at a first time point, the eNB may separately transmit resource grants for the direct path mode to the source UE and the destination UE through the PDCCH to allocate radio resources to the source UE and the destination UE (in step S420). The dotted line enables the source UE to directly transmit the first data packet to the destination UE through the direct path (the solid line in step S420). At a second time point, the eNB may separately transmit resources for the relay path mode to the source UE, the destination UE, and the relay UE through the PDCCH to allocate radio resources to the source UE, the destination UE, and the relay. The UE (dashed line in step S425) enables the source UE to transmit the second data packet to the destination UE through the relay path using the relay UE (the solid line in step S425). At a third time point, the eNB may separately transmit the resources for the local routing mode to the source UE and the destination UE through the PDCCH to allocate radio resources to the source UE and the destination UE (the dotted line in step S430). So that the source UE can transmit the third data packet to the destination UE through the local route by the eNB (the solid line in step S430). It should be noted that the resource grants transmitted to the source UE, the relay UE, and the destination UE are different.

Some embodiments of the present disclosure present techniques for transmitting/recombining data packets in different D2D communication modes. In addition, a detailed description of the radio resource scheduling algorithm will be described below.

Direct path mode

FIG. 5 is a diagram showing a Radio Protocol Stack 500 for transmitting a data packet direct path mode between a source UE 510 and a destination UE 520 according to an embodiment of the present disclosure. The protocol stack of the source UE 510 may include a Packet Data Convergence Protocol (PDCP) layer 512, a Radio Link Control (RLC) layer 514, and a Medium Access Control (MAC). Layer 516 and Physical (PHY) layer 518. The protocol stack of the destination UE 520 may include a PDCP layer 522, an RLC layer 524, a MAC layer 526, and a PHY layer 528. Each layer receives a higher level Service Data Unit (SDU), adds a header to the SDU to generate a Protocol Data Unit (PDU), and transmits the PDU to a lower layer. The PDU is considered an SDU at a lower layer.

A PDCP entity and an RLC entity may be referred to as a Radio Bearer (RB). When the RB is established, each RB may be configured with a corresponding set of Quality of Service (QoS) parameters. A UE may have many RBs corresponding to different QoS requests. The eNB may dynamically determine the radio resource configuration per millisecond according to the channel quality measurement result and the Buffer Status Report (BSR), and transmit the resource to the source UE 510 through the PDCCH transmission resource to indicate that the source UE 510 is The data packet is transmitted to the destination UE 520 in a suitable D2D communication mode. The resource grant can include where the current millisecond radio resource is and the associated transmission parameters. In addition, the priority processing between multiple RBs in the source UE 510 is derived from The MAC entity of the MAC layer 516 within the source UE determines. The process of processing data packets in the PDCP layer, the RLC layer, and the MAC layer will be described below.

The PDCP entity at the transmitting end of the PDCP layer 512 performs IP header compression of the IP packet to save radio resources for transmitting the IP packet. The PDCP entity at the receiving end of the PDCP layer 522 performs IP header decompression of the IP packet to retrieve the original IP packet. The PDCP entity also performs encryption/decryption of IP data packets to provide data encryption to avoid information leakage.

The RLC entity at the transmitting end of the RLC layer 514 is responsible for reconstructing an RLC PDU having a suitable size by concatenating and concatenating one or more consecutive SDUs, as shown in FIG. The RLC real system at the receiving end of the RLC layer 524 is responsible for reassembling the RLC SDU based on splitting and concatenating information in an RLC header. In addition, a Sequence Number (SN) is assigned to each RLC PDU and carried by each RLCgram. The RLC entity at the receiving end of the RLC layer 524 can perform reordering and repeated detection of RLC PDUs according to the SN. In addition, the RLC entity at the receiving end of the RLC layer 524 can inform the RLC entity at the transmitting end of the RLC layer 514 which RLC PDU has been lost, so that the RLC entity at the transmitting end of the RLC layer 514 can retransmit the lost RLC PDU. If the retransmitted RLC PDU size is not suitable for the new size determined by the MAC entity of the MAC layer 516, the RLC entity at the transmitting end of the RLC layer 514 reconstructs multiple data of the appropriate size by re-segmenting the data field of the retransmitted RLC PDU. RLC PDU segmentation, as shown in Figure 7, wherein the SN carried in the header of each RLC PDU segment is equal to the SN of the original retransmitted RLC PDU, and the header of each RLC PDU segment carries Re-segmentation information required, for example, Segment Offset (SO).

The MAC entity at the transmitting end of the MAC layer 516 can report the number of buffered packets (ie, BSRs) to the eNB. When the source UE 510 receives a resource grant from the eNB At the time, the MAC entity of the source UE 510 can determine how many bits can be carried by each RLC entity according to the QoS request. The resource grants transmitted by the eNB may indicate the radio resources and transmission parameters that are granted to the source UE 510, wherein the radio resources and transmission parameters granted to the source UE 510 may be obtained by the eNB according to step S410 in FIG. The channel quality measurement and BSR execution scheduling algorithm are determined.

The MAC entity at the sender of MAC layer 516 may construct a MAC PDU by multiplexing the MAC SDUs (which are equal to RLC PDUs or RLC PDU segments) delivered by different RLC entities, where the header of each MAC PDU carries each MAC SDU size and corresponding RLC identification (ID) for each MAC SDU. The MAC entity at the receiving end of the MAC layer 526 can demultiplex the MAC PDU according to the information carried in the MAC header to retrieve the MAC SDU.

Relay path mode

FIG. 8 shows a radio protocol stack 800 for transmitting a relay path pattern of data packets between a source UE 510 and a destination UE 520 by using a relay UE 830 according to an embodiment of the present disclosure. The same blocks as in Fig. 5 can be denoted by the same reference numerals.

It should be noted that in this embodiment, a relay RLC (RRLC) layer 832 is configured in the relay UE 830, wherein an RRLC entity at the RRLC layer 832 provides only a re-segmentation function. More specifically, the MAC SDU from the source UE 510 can be considered a retransmitted RLC PDU. The RRLC entity at the RRLC layer 832 can construct a plurality of RLC PDU segments of suitable size by re-segmenting the retransmitted RLC PDUs as shown in FIG.

Furthermore, since the MAC entity of the relay UE 830 does not know the corresponding QoS parameter set, the MAC real system in the MAC layer 834 of the relay UE 830 is based on A first-in first-out (FIFO) principle performs priority processing.

Processing the data packet procedure in the RRLC layer and the MAC layer of the relay UE 830 will be described below.

The RRLC entity at the RRLC layer 832 of the relay UE 830 provides only a re-segmentation function. If an RLC PDU from the source UE 510 is transmitted by the priority processing of the MAC entity in the MAC layer 834 indicating that the RLC PDU does not need to be re-segmented, then the RRLC entity directly transmits the above RLC PDU to the MAC layer 834. If an RLC PDU from the source UE 510 indicates that the RLC PDU has to be re-segmented by the priority processing of the MAC entity in the MAC layer 834, the RRLC entity can construct a suitable size by re-segmenting the above RLC PDU. Segments of RLC PDUs, as shown in Figure 7. The SN carried in each RLC PDU segment header is equal to the SN of the original RLC PDU. The header of each RLC PDU segment also carries the required re-segmentation information, for example, Segment Offset (SO). The RRLC entity transmits the first RLC PDU segment to the MAC entity in the MAC layer 834.

After the relay UE 830 receives a MAC PDU from the source UE 510, the MAC entity in the MAC layer 834 of the relay UE 830 may demultiplex the MAC PDU according to the information carried in the MAC header to retrieve the RLC PDU. . In addition, the MAC entity in the MAC layer 834 of the relay UE 830 can record the size of the RLC PDU 5 received from the source UE 510, the corresponding RLC ID, and the received sequence. When the relay UE 830 receives a resource grant from the eNB, the MAC entity in the MAC layer 834 of the relay UE 830 can calculate the total number of bits that can be carried by the MAC layer 834. The resource granting by the eNB indicates the granting radio resource and transmission parameters for relaying the UE 830, wherein the granting radio resources and transmission parameters for the relaying UE 830 are determined by the eNB based on step S410 of FIG. Channel quality measurement and BSR implementation Determined by the row scheduling algorithm.

The MAC entity in the MAC layer 834 of the relay UE 830 notifies which one or more RRLC PDUs in the RRLC layer can be transmitted without splitting or which RLC PDU needs to be re-segmented and transmitted according to the first in first out principle.

Figure 9 is a diagram showing an example of processing a data packet by a relay UE in accordance with an embodiment of the present disclosure. The relay UE in FIG. 9 can be used to embody the relay UE 830 in FIG.

In time point 1, the relay UE receives a MAC PDU from the source UE and retrieves the RLC PDUs 1~3, where the corresponding RLC IDs of the RLC PDUs 1~3 are A~C, respectively. RLC PDUs 1~3 are respectively delivered to the corresponding RRLC entities A~C.

At time 2, the relay UE receives another MAC PDU from the source UE and retrieves the RLC PDU 4, where the corresponding RLC ID of the RLC PDU 4 is B. The RLC PDU 4 is passed to the corresponding RRLC entity B.

At time point 3, the relay UE receives a resource grant from the eNB and the total character of the MAC SDU carried by the resource grant is 2360 characters. Based on the FIFO principle, the MAC entity in the MAC layer informs that the corresponding RRLC entity in the RRLC layer indicates that the RLC PDUs 1-3 can be transmitted without re-segmentation, and the RLC PDU 4 needs to be re-segmented and transmitted. Then, the corresponding RRLC entity passes the RLC PDU 1~3 to the MAC entity in the MAC layer as 5~7 of the MAC SDU, constructs an RLC PDU segment with an appropriate size by re-segmenting the RLC PDU4, and delivers the RLC PDU segment. The MAC entity in the MAC layer acts as the MAC SDU 8. Finally, the MAC entity in the MAC layer constructs a MAC PDU by multiplexing the MAC SDUs 5-8, and delivers the MAC PDU to the PHY entity in the PHY layer of the relay UE.

Figure 10 is a diagram showing the use according to an embodiment of the present disclosure. A relay UE 1030 transmits a radio protocol stack 1000 of a relay path mode of a data packet between a source UE 510 and a destination UE 520. The same blocks as in Fig. 5 can be denoted by the same reference numerals.

It should be noted that, in this embodiment, a relay RLC (RRLC) layer 1032 is configured in the relay UE 1030, and an RRLC layer 1022 is configured in the destination UE 520, where the UE 1030 is relayed. An RRLC entity in the RRLC layer 1032 provides only concatenate and split functions, and one of the RRLC layers in the RRLC layer 1022 of the destination UE 520 provides reassembly, reordering, and retransmission. The process of processing data packets in the RRLC layer and the MAC layer of the relay UE 1030 and the destination UE 520 will be explained as follows.

The RRLC entity in the RRLC layer 1032 of the relay UE 1030 can construct an RRLC PDU having a suitable size by splitting and connecting one or more consecutive RRLC SDUs. The size of the RRLC PDU is determined by the priority processing of the MAC entity in the MAC layer 1036 of the relay UE 1030, where the RRLC header carries the required split and link information.

The RRLC entity in the RRLC layer 1022 of the destination UE 520 may reassemble the RRLC SDU based on the split and link information carried in the RRLC header. In addition, the RRLC entity in the RRLC layer 1022 of the destination UE 520 can perform reordering and repeated detection of the RRLC PDUs further according to the SN.

After the relay UE 1030 receives a MAC PDU from the source UE 510, the MAC entity in the MAC layer 1036 of the relay UE 1030 may demultiplex the MAC PDU according to the information carried in the MAC header to retrieve the RLC PDU. . In addition, the MAC entity in the MAC layer 1036 of the relay UE 1030 can record the size of the RLC PDU received from the source UE 510, the corresponding RLC ID, and the receiving order. among After the UE 1030 receives the resource grant from the eNB, the MAC entity in the MAC layer 1036 of the relay UE 1030 can determine how many bits can be carried by each RRLC entity in the RRLC layer 1032 based on the first in first out principle. The resource grant indication is used to relay the granting radio resources and transmission parameters of the UE 1030, wherein the granting radio resources and transmission parameters for relaying the UE 1030 can be measured by the eNB according to the channel quality obtained in step S410 in FIG. And the BSR performs the scheduling algorithm as determined.

Figure 11 is a diagram showing another example of processing a data packet by a relay UE in accordance with another embodiment of the present disclosure. The relay UE in FIG. 11 can be used to embody the relay UE 1030 in FIG.

In time point 1, the relay UE receives a MAC PDU from the source UE and retrieves the RLC PDUs 1~3, where the corresponding RLC IDs of the RLC PDUs 1~3 are A~C, respectively. RLC PDUs 1~3 are respectively delivered to the corresponding RRLC entities A~C.

At time 2, the relay UE receives another MAC PDU from the source UE and retrieves the RLC PDU 4, where the corresponding RLC ID of the RLC PDU 4 is B. The RLC PDU 4 is passed to the corresponding RRLC entity B.

At time point 3, the relay UE receives a resource grant from the eNB and the total character of the MAC SDU carried by the resource grant is 2360 characters. Based on the FIFO principle, the MAC entity in the MAC layer of the relay UE determines how many bits are carried by each RRLC entity. The RRLC entity A construct includes an RRLC PDU 1 that does not link other (complex) RRLC PDUs or (complex) RRLC PDU segments to the entire RRLC SDU 1. The RRLC entity B constructs an RRLC PDU 2 by dividing the RRLC SDU 4 and the segments joining the entire RRLC SDU 2 and the RRLC SDU 4. The RRLC entity C construct includes an RRLC PDU 3 that does not link other (complex) RRLC PDUs or (multiple) RRLC PDU segments to the overall RRLC SDU 3. RRLC entity A~C delivery The RRLC PDU 1~3 to the MAC entity in the MAC layer of the relay UE is used as the MAC SDU 5~7. Finally, the MAC entity in the MAC layer of the relay UE constructs a MAC PDU by multiplexing the MAC SDU 5~7, and delivers the MAC PDU to the PHY entity in the PHY layer of the relay UE.

Local routing mode

12 to 13 show a radio protocol stack 1200 for transmitting a local packet mode of a data packet between a source UE 510 and a destination UE 520 via an eNB according to an embodiment of the present disclosure. The same blocks as those in Figs. 8 and 10 can be denoted by the same reference numerals.

As shown in Figures 12-13, the architecture of the local routing mode is basically the same as the architecture of the relay path mode. The difference between the architecture of the local routing mode and the architecture of the relay path mode is that the eNB has replaced the relay UE since its use. Therefore, in FIG. 12, one RRLC entity in the RRLC layer 1232 of the eNB 1240, one MAC entity in the MAC layer 1246 of the eNB 1240, and other related technologies are the same as the embodiment described in FIG. 8, The technical details of the relevant systems will not be described again. Similarly, in FIG. 13, one RRLC entity in the RRLC layer 1342 of the eNB 1340, one MAC entity in the MAC layer 1346 of the eNB 1340, and other related technologies are the same as the embodiment described in FIG. 10, Therefore, the technical details of the relevant system will not be described again.

However, since the eNB knows the corresponding QoS parameter set when the RB is established, the MAC entity of the eNB 1240 and the eNB 1340 can perform priority processing based on the corresponding QoS parameter set. In another embodiment, the MAC entity of eNB 1240 and eNB 1340 may also perform priority processing based on a first in first out principle.

Figure 14 is a flow diagram 1400 showing one method of transmitting a plurality of data packets in a wireless network in accordance with an embodiment of the present disclosure. This method For a communication device, such as a relay UE, wherein the communication device can enable Device-to-Device (D2D) communication. In step S1405, the communication device receives one or more first MAC PDUs including a plurality of RLC PDUs from a source end UE of the wireless network that are expected to be transmitted to a destination UE. Next, in step S1410, the communication device demultiplexes the first MAC PDU according to a header field of each first MAC PDU to retrieve the RLC PDU.

In step S1415, the communication device generates a plurality of RLC PDU segments from one or more RLC PDUs according to one or more MAC PDU sizes or generates a Multiple Relay RLC (RRLC) PDU from all RLC PDUs, where RRLC It is a protocol layer between a MAC layer and an RLC layer. Next, in step S1420, the communication device multiplexes the RLC PDU and the RLC PDU segment or the RRLC PDU into one or more second MAC PDUs. In step S1425, the communication device transmits the second MAC PDU to the destination UE.

In an embodiment, in step S1415, the communication device may re-segment one of the RLC PDUs according to one of the MAC PDU sizes and add a re-segmentation information to a header column of one of the RLC PDUs. One of the RLC PDU segments is generated in the bit.

In another embodiment, in step S1415, the communication device can generate the RRLC by segmenting and concatenating the RLC PDU and adding a header including a split and link information to each RRLC PDU according to the MAC PDU size. PDU.

In an embodiment, the MAC PDU size is obtained based on one or more resources transmitted by a base station. In another embodiment, the RLC PDU and the RLC PDU segment or the RRLC PDU in step S1420 are based on a first in first out. The (First-in First-out, FIFO) principle is multiplexed to operate as the second MAC PDU described above.

In one embodiment, the method as described in FIG. 14 can also be applied to a communication device such as a base station. It should be noted that, in step S1420, the base station may operate the RLC PDU and the RLC PDU segment or the RRLC PDU as the second MAC PDU according to a priority order, wherein the priority order is based on a first in first out (First- In First-out, FIFO) principle or Quality of Service (QoS) parameters.

Figure 15 is a flow diagram 1500 showing one method of transmitting a plurality of data packets in a wireless network in accordance with an embodiment of the present disclosure. The method is used for a communication device, which may be a destination UE, wherein the communication device can enable Device-to-Device (D2D) communication. In step S1505, the communication device receives and directly receives one or more MAC PDUs from a source UE of the wireless network through a relay UE and a base station, wherein the MAC PDU is composed of a plurality of RLC PDUs and a plurality of RLC PDUs. Segmented by. Next, in step S1510, the communication device demultiplexes the MAC PDU according to a header field of each MAC PDU to retrieve the RLC PDU and the RLC PDU segment. In step S1515, the communication device reorders the RLC PDU and the RLC PDU segment according to Transmission Sequence Numbers (TSNs), and performs a repeated detection of the RLC PDU and the RLC PDU segment, wherein each TSN It is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment. In step S1520, the communication device reassembles the RLC PDU and the RLC PDU segment into a plurality of RLC SDUs using information included in each of the RLC PDUs and the header field of each of the RLC PDU segments.

Figure 16 is a diagram showing a wireless device according to an embodiment of the present disclosure. Flowchart 1600 for transmitting a method for receiving a plurality of data packets in a network. The method is used for a communication device, such as a destination UE, wherein the communication device can enable Device-to-Device (D2D) communication. In step S1605, the communication device receives a plurality of first MAC PDUs from the source UE through a relay UE and a base station, where the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs. The RRLC PDU is a PDU of a protocol layer between the MAC layer and the RLC layer, and directly receives a plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is composed of a plurality of first RLC PDUs and The first plurality of RLC PDU segments are composed. Next, in step S1610, the communication device demultiplexes the first MAC PDU according to a header field of each first MAC PDU to retrieve the RRLC PDU, and according to a header column of each second MAC PDU. The bit multiplexing operates the second MAC PDU to retrieve the first RLC PDU and the first RLC PDU segment. In step S1615, the communication device reorders the RRLC PDUs according to Transmission Sequence Numbers (TSNs), and performs a repetition detection of the RRLC PDUs, wherein each transmission sequence number is included in one of the headers of each RRLC PDU. In the field. In step S1620, the communication device reassembles the RRLC PDU to the plurality of second RLC PDUs and the plurality of second RLC PDU segments using information of the header fields included in each of the RRLC PDUs. In step S1625, the communication device reorders the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment according to the transmission sequence, and executes the first RLC PDU, the foregoing a repetition detection of an RLC PDU segment, the foregoing second RLC PDU, and the second RLC PDU segment, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment in. In step S1630, the communication device uses each of the RLC PDUs included above and each of the above Information in a header field of an RLC PDU segment to reassemble the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment into a plurality of RLC SDUs.

Radio resource scheduling algorithm

Figure 17 is a diagram showing one of D2D communication having a communication mode in an LTE-A system according to an embodiment of the present disclosure.

[1,2,...,K]。D2D通訊對#k的來源端UE和目的端UE可分別表示為k(s)和k(d)。中繼UE的總數為N。UE被用於所有D2D通訊對的候選中繼輔助模式中。被選作為D2D通訊對#k之中繼點的中繼UE以k(r)來表示。在小區1700中每一D2D通訊對具有三個候選通訊模式，即直接路徑模式、中繼路徑模式、和本地路由模式。用於分配的無線電資源為LTE-A上行鏈路無線電資源，且無線電資源的總量係描述為物理資源塊(Physical Resource Blocks，PRBs)的數量。假設可由eNB排程的PRB總數量為M。 As shown in FIG. 17, this is a single cell scenario with D2D and relay communication capability UEs in the LTE-A system. Two D2D capable UEs that want to communicate with each other are considered to be D2D capable communication pairs. For example, seven pairs of D2D communication pairs are shown in Figure 17, that is, D2D communication pairs #1, #2, #3, #4, #5, #6, and #7. It is assumed that a total of K pairs of D2D communication pairs are in cell 1700, and D2D communication pairs are numbered by k . Therefore, k , j

[1,2,..., K ]. The source UE and the destination UE of the D2D communication pair #k can be represented as k ( s ) and k ( d ), respectively. The total number of relayed UEs is N. The UE is used in the candidate relay assist mode for all D2D communication pairs. The relay UE selected as the relay point of the D2D communication pair #k is represented by k ( r ). Each D2D communication pair in cell 1700 has three candidate communication modes, a direct path mode, a relay path mode, and a local routing mode. The radio resources used for allocation are LTE-A uplink radio resources, and the total amount of radio resources is described as the number of physical resource blocks (PRBs). Assume that the total number of PRBs that can be scheduled by the eNB is M.

In order to ensure uplink channel conditions in the local routing mode and to improve spectral efficiency, the rules for radio resource allocation are specifically described below. First, a PRB can be assigned to only one D2D communication pair in the local routing mode, which means that if a PRB is assigned to a D2D communication pair in the local routing mode, the eNB cannot allocate a PRB. To other D2D communication pairs in local routing mode or direct path/relay path mode. Second, when the total transmission rate of the PRB can be increased, either in the direct path mode or in the relay path mode, a PRB can be assigned to one or two D2D communication pairs. Third, if a D2D communication pair operates in the relay path mode, the source-to-inter-relay link and the relay-to-destination link of the D2D communication pair are assigned the same radio resource, that is, the same PRB. . Finally, considering that the uplink radio resource scheduling in the LTE-A system is usually performed based on Single-Carrier Frequency-Division Multiple Access (SC-FDMA) technology, and is allocated to D2D. The PRB of the communication pair should be continuous. According to these rules, when interference is assigned the same PRB, the potential interference should be considered as interference between different D2D communication pairs in the direct path/relay path mode. The potential interference link is also shown in Figure 17.

In addition, there are two transmission power limits in the radio resource scheduling procedure. The first one is in a D2D communication pair and the total transmission power of the source UE allocated to all PRBs of the source UE should not be greater than the maximum transmission power allowed. The second is that the total transmission power of the source UE in the D2D communication pair should be evenly distributed on all PRBs allocated to the source UE.

The radio resource scheduling algorithm is operated in the machine eNB. For example, an eNB can be viewed as a central scheduler that is responsible for mode selection, PRB allocation, and power coordination for all D2D communication pairs in all cells 1700. The purpose of the scheduling performed in each LTE-A subframe (1 millisecond (ms)) is to maximize the total throughput of all D2D communication pairs in all cells 1700. The optimal scheduling decision is based on the CSI of all participating links, and these CSIs are taken from feedback from all participating UEs in each subframe. For D2D communication pairs in direct path mode, one The complete endpoint-to-endpoint data transfer can be done in a subframe. For a D2D communication pair in the relay path mode, a complete endpoint-to-endpoint data transmission consists of a first hop transmission and a second hop transmission, which respectively correspond to the source to the relay. The transmission between the relay and the relay to the destination. Obviously, the first hop and the second hop transmission cannot be performed simultaneously, which means that the first hop and the second hop transmission must be performed in two time slots. Therefore, for a D2D communication pair in the relay path D2D mode, it can be considered that the transmission from the source to the relay is performed in the first half of the subframe, and the transmission between the relay and the destination is This is done in the second half of the subframe. For D2D communication pairs in local routing mode, performing endpoint-to-endpoint data transmission is the same as general cellular communication in uplink and downlink transmissions, for example, from source to eNB. The transmission and transmission between the eNB and the destination are performed in two separate frames. Figure 18 is a diagram showing the principle of transmission data rate estimation in three D2D communication modes during each subframe according to an embodiment of the present disclosure.

According to the D2D system described above, the scheduling procedure in mode selection, PRB allocation, and power coordination can formulate an arithmetic optimization problem that maximizes the total throughput of all D2D communication in a subframe. The solution to this optimization problem is definitely the best scheduling decision. However, solving the optimization problem in order to mathematically obtain an absolutely optimal solution is very complicated. Therefore, heuristics that perform scheduling procedures on mode selection and resource allocation to obtain a near-optimized scheduling decision in each subframe are studied in this disclosure. Figure 19 is a functional block diagram 1900 showing a scheduling procedure in accordance with an embodiment of the present disclosure.

In each subframe, the eNB scheduler first compares each of the cells 1700 according to the measured data rate of the D2D communication pair in the three communication modes in block 1910. D2D communication is the mode selection decision. In the subframe, the data rate is predicted based on the CSI reported from all participating UEs in block 1905. Based on the mode selection results, in block 1910, the PRB is specified for the purpose of maximizing the data transmission rate on each PRB, and power coordination is performed when PRB reuse occurs between different D2D communication pairs. The details of how to perform mode selection and PRB allocation will be described below.

Mode selection based on data rate prediction

The purpose of scheduling is to maximize the total throughput of all D2D communication pairs in each subframe. Therefore, for each D2D communication pair, the communication mode of the corresponding maximum data rate in the subframe should be selected. For a particular D2D communication pair #k , the mode selection procedure steps in the disclosed scheduling scheme can be illustrated by the following steps.

其中

表示在直接路徑模式下D2D通訊對#k的估計數據速率，而B表示一PRB的頻寬，即B=180千赫(kHz)。P _max表示每一UE的最大傳輸功率，而

表示D2D通訊對#k直接傳輸鏈路的通道增益，以及σ ²表示在一PRB中的雜訊功率。 Step 1: The eNB uses the CSI (channel gain) of the direct source-to-destination link and the maximum transmission power of the UE to estimate the data rate achievable on a PRB. The estimation program can be expressed mathematically as

among them

Indicates the estimated data rate of the D2D communication pair #k in the direct path mode, and B represents the bandwidth of a PRB, that is, B = 180 kilohertz (kHz). P _max represents the maximum transmission power of each UE, and

Indicates the channel gain of the D2D communication pair #k direct transmission link, and σ ² represents the noise power in a PRB.

其中

表示在中繼路徑模式下D2D通訊對#k的估計可達成端 點至端點間數據速率。

及

分別表示中繼路徑模式第一跳及第二跳鏈路的通道增益。在方程式(2)的「min」函式中，第一項為來源端至中繼之間鏈路的信噪比(Signal-to-noise ratio，SNR)，而第二項為中繼至目的端之間鏈路的SNR。應注意的是，在中繼路徑模式下，端點至端點數據傳輸需要在一子訊框內兩個時槽中完成且最大可達成的數據速率是由具有最差通道條件的跳中繼(hop relay)所決定。因此，可達成的端點至端點數據速率等於可在具有最差通道條件的跳中繼中可達成數據速率的一半，其已在第18圖中所示。 Step 2: The eNB estimates the end-to-endpoint data rate achievable by the D2D communication pair #k in the relay path mode of a PRB. In order to perform this estimation, the eNB first performs a relay selection operation to find the best relay UE for the D2D communication pair #k , wherein the relay UE that maximizes the endpoint-to-endpoint data rate of the relay path is Selected as relay UE k ( r ). Both estimation procedure, D2D communication source terminal UE and the UE # k all relay participation using the same transmission power P _max and the relay selection can achieve data rates. The estimation procedure of the reachable endpoint-to-endpoint data rate of the D2D communication pair #k in a PRB can be mathematically expressed as

among them

Indicates that the D2D communication pair #k estimate in the relay path mode can achieve an endpoint-to-endpoint data rate.

and

The channel gains of the first hop and the second hop link of the relay path mode are respectively indicated. In the "min" function of equation (2), the first term is the signal-to-noise ratio (SNR) of the link from the source to the relay, and the second is the relay to the destination. The SNR of the link between the ends. It should be noted that in the relay path mode, the endpoint-to-endpoint data transmission needs to be completed in two time slots in one subframe and the maximum achievable data rate is the hop relay with the worst channel condition. (hop relay) decided. Thus, the achievable endpoint-to-endpoint data rate is equal to half of the data rate achievable in a hop relay with the worst channel conditions, which is shown in Figure 18.

Step 3: The eNB estimates the reachable end-to-endpoint data rate of the D2D communication pair #k in a local routing mode of the PRB. In local routing mode, only uplink transmissions can be done in a subframe, as shown in Figure 18. It is assumed that the downlink transmission is always successful, which means that the downlink data rate is always greater than the uplink data rate, which is due to the eNB being a downlink transmitter and capable of ensuring success for downlink transmission. Therefore, it can be determined that the reachable endpoint-to-endpoint data rate of the D2D communication pair #k in a local routing mode of a PRB can be determined by the uplink data rate. According to the calculation principle given in Fig. 18, the above estimation can be mathematically described as

表示在一PRB上本地路由模式下用於D2D通訊對 #k中估計可達成端點至端點間數據速率。

表示在一PRB的D2D通訊對#k的上行鏈路通道增益。其它參數的定義類似在方程式(1)的參數。由於在本地路由模式中一完整端點至端點間傳輸需兩個子訊框才能完成，因此需將在一子訊框中可達成端點至端點間數據速率可表達為其上行鏈路數據速率的一半。 among them

Indicates that the end-to-endpoint data rate can be achieved for the D2D communication pair #k in the local routing mode on a PRB.

Indicates the uplink channel gain of the D2D communication pair #k in a PRB. The definition of other parameters is similar to the parameter in equation (1). Since a complete endpoint-to-endpoint transmission requires two subframes in the local routing mode, the endpoint-to-endpoint data rate can be expressed in a subframe to be expressed as its uplink. Half the data rate.

時，選擇直接路徑模式；-當

時，選擇中繼路徑模式；或 -當

時，選擇本地路由模式。 Step 4: After estimating the end-to-endpoint data rate of the D2D communication pair #k in three different D2D communication modes, the eNB compares the estimated results. The corresponding maximum estimated endpoint-to-endpoint data rate D2D communication mode is selected as the communication mode of the D2D communication pair #k . Examples are as follows: - When

When choosing the direct path mode; - when

When selecting the relay path mode; or - when

When you choose local routing mode.

According to this principle, the eNB can make a mode selection decision for each D2D communication pair and obtain the maximum endpoint-to-endpoint data rate for each D2D communication pair. Figure 20 is a flow chart 2000 showing a mode selection procedure for all D2D communication pairs performed by an eNB in accordance with an embodiment of the present disclosure.

PRB allocation and power coordination

Radio Resource (PRBs) allocations are performed on the maximum endpoint-to-endpoint data rate for all D2D communications, which has been estimated in the mode selection decision procedure. The PRB allocation should confirm that the PRBs assigned to the D2D communication pair are contiguous, and the transmit power of a source UE in a D2D communication pair should be evenly distributed among all PRBs assigned to the D2D communication pair.

The core concept of the proposed PRB allocation strategy is that a D2D communication pair with a higher endpoint-to-endpoint data rate will have a higher priority in the PRB allocation and also a higher probability to be assigned more PRBs. The goal is to maximize the data rate between the endpoints to the endpoints on the M PRBs. It should be noted that the proposed PRB allocation strategy is a one-two-stage allocation strategy. If all D2D communication pairs are allocated PRBs for data transmission in the first phase, the radio resource allocation will stop. Conversely, if there are still D2D communication pairs in the direct path/relay path mode that are not assigned any PRBs in the first phase, then the second phase of PRB allocation will be initiated, where the eNB will decide whether these D2D communication pairs are shared. PRBs that have been assigned to other D2D communication pairs.

I. Phase 1 PRB allocation

The first stage PRB allocation system based on a single endpoint PRB for the K D2D communication between endpoints to perform data rate, wherein said K for D2D communication system operating at its best D2D communication mode. Let R ₁ , R ₂ ,..., R _k ,..., R _K represent the data rates of the K D2D communication pairs, respectively. The first stage PRB allocation strategy of the proposed scheduling scheme can be detailed as follows.

,

,...,

,...,

。 Step 1: The eNB rearranges the K D2D communication pairs based on the decreasing order of their data rates. The order of the K D2D communication pairs after rearrangement can be expressed as p ₁ , p ₂ ,..., p _k ,..., p _K , whose corresponding relationship in the data rate is

,

,...,

,...,

.

Step 2: The eNB allocates the first PRB to D2D communication pair p ₁ and calculates the endpoint-to-endpoint data rate of the D2D communication pair p ₁ again using a reduced transmission power equal to P _max /2. Next, the eNB compares and determines whether the D2D communication pair p ₁ still has the maximum endpoint-to-endpoint data rate in all D2D communication pairs. If so, the program proceeds to the next step, step 3. Otherwise, the program proceeds to step 4.

Step 3: The eNB allocates the second PRB to the D2D communication pair p ₁ and calculates the endpoint-to-endpoint data rate of the D2D communication pair p ₁ again using a reduced transmission power equal to P _max /3. Next, the eNB compares again and determines if the D2D communication pair p ₁ still has the maximum endpoint-to-endpoint data rate in all D2D communication pairs. If yes, the program proceeds to step 5. Otherwise, the program proceeds to step 6.

Step 4: The eNB stops the PRB allocation to the D2D communication pair p ₁ and allocates the second PRB to the D2D communication pair p ₂ . Subsequently, the eNB using a reduced transmission power is equal to P _max / 2 is calculated again D2D communication endpoint p ₂ to the data rate between the endpoints, and compared again to determine whether the D2D communication of p ₂ still has all of the D2D communication Maximum endpoint to inter-endpoint data rate. If yes, the program proceeds to step 7. Otherwise, the program proceeds to step 8.

Step 5: The eNB allocates the third PRB to the D2D communication pair p ₁ and calculates the endpoint-to-endpoint data rate of the D2D communication pair p ₁ again using a reduced transmission power equal to P _max /4. Again eNB D2D communications for comparison to determine whether p ₁ still has a maximum endpoint in all of the D2D communication between endpoints to the data rate. If so, the next PRB (ie, the fourth PRB) will be assigned to the D2D communication pair p ₁ . Otherwise, the eNB will stop the PRB assignment to the D2D communication pair p ₁ and assign the next PRB to the D2D communication pair p ₂ . It should be noted that the allocation procedure will continue until all M PRB assignments are completed.

Step 6: The eNB stops the PRB allocation to the D2D communication pair p ₁ and allocates the third PRB to the D2D communication pair p ₂ . Subsequently, the eNB using equal P _max / 2 to reduce a transmission power calculating again D2D communication endpoint p ₂ to the data rate between the endpoints, and compared again to determine whether the D2D communication in addition to p ₂ p ₁ D2D communication outside of Whether there is still a maximum endpoint-to-endpoint data rate for all D2D communication pairs. If so, the next PRB (ie, the fourth PRB) will be assigned to the D2D communication pair p ₂ . Otherwise, the eNB will stop the PRB assignment to the D2D communication pair p ₂ and assign the next PRB to the D2D communication pair p ₃ . It should be noted that the allocation procedure will continue until all M PRB assignments are completed.

Step 7: eNB D2D communication to the PRB allocated for the third p _2, using equal P _max / 3 is a reduced transmission power is recalculated endpoint D2D communication between endpoints p ₂ to the data rate. eNB D2D communication compared again to determine whether the addition of p ₂ p ₁ D2D communication outside of all whether the D2D communication terminal still has a maximum data rate to between endpoints. If so, the next PRB (ie, the fourth PRB) will be assigned to the D2D communication pair p ₂ . Otherwise, the eNB will stop the PRB assignment to the D2D communication pair p ₂ and assign the next PRB to the D2D communication pair p ₃ . It should be noted that the allocation procedure will continue until all M PRB assignments are completed.

Step 8: The eNB stops the PRB allocation to the D2D communication pair p ₂ and allocates the third PRB to the D2D communication pair p ₃ . Subsequently, the eNB using a reduced transmission power is equal to P _max / 2 is calculated again D2D communication endpoint p ₃ to a data rate between the endpoints, and compared again to determine whether the D2D communication in addition to p ₃ p ₁ and of the D2D communications p Whether all D2D communication pairs outside of ₂ still have the maximum endpoint-to-endpoint data rate. If so, then the next PRB (ie, fourth PRB) allocated to the D2D communication to p _3. Otherwise, eNB will stop the PRB allocated to the D2D communication to p _3, and assigned to the next PRB D2D communication to p _4. It should be noted that the allocation procedure will continue until all M PRB assignments are completed.

This PRB allocation procedure will continue until all M PRBs are assigned to the D2D communication pair. For example, when all PRBs have been assigned, the PRB allocation for the first phase is terminated. If all PRBs can be assigned to a D2D capable D2D communication pair in the first phase allocation, the eNB will stop the scheduling algorithm. Otherwise, the eNB will determine if there are still D2D communication pairs that are not assigned any PRBs in the direct path/relay path mode in the first phase allocation. If so, the eNB will begin the second phase of PRB allocation. If not, for example, the D2D communication in any of the PRB local routing modes is not assigned in the first phase, then the eNB will also stop the scheduling algorithm. Figure 21 is a flow chart 2100 showing a first stage PRB allocation in a scheduling algorithm in accordance with an embodiment of the present disclosure.

II. Phase II PRB allocation

The second stage PRB allocation is performed in accordance with the idea of radio resource sharing, which allows the PRBs that have been assigned to a D2D communication pair to be reused by other D2D communication pairs that have not been assigned any PRBs. The purpose of PRB reuse is to increase the total amount of data transmitted in one of these PRB subframes. The second stage PRB allocation can be performed according to the following steps.

Step 1: The eNB lists all D2D communication pairs that have been assigned PRBs in the first round of PRB allocation procedures, and the remaining D2D communication pairs that have not been assigned any PRBs. All D2D communication pairs that have been assigned PRBs in the first round of allocation, ie, reuse candidate D2D communication pairs, respectively, indexed as 1, 2, ..., u , ..., U. In the first stage allocation, the D2D communication pair that is not assigned any PRB, that is, the remaining D2D communication pairs, respectively, is indexed as 1, 2, ..., u , ..., U.

Step 2: The eNB establishes a two-dimensional table to find the best reuse partner in reusing the candidate D2D communication pair and the remaining D2D communication pairs, the goal of which is to maximize the total data rate of the M PRBs. One dimension in the table is the index value for reusing the candidate D2D communication pair, and the other dimension in the table is the index value of the remaining D2D communication pairs.

The elements of the table content are the endpoint-to-endpoint data rate increments caused by resource sharing on the PRB of the candidate D2D communication pair, which is also the matrix used to select the best reuse partner. For each of the remaining D2D communication pairs, the corresponding maximum data rate increment reuse candidate D2D communication pair will be selected as its reuse partner.

Endpoint to endpoint data rate increments are defined as follows. If a D2D communication pair u , which has been assigned to the PRB during the first phase of allocation, can achieve an end-to-endpoint data rate on its PRB without resource reuse, then no resource reuse is required and The total endpoint-to-endpoint data rate on the PRB can be defined equal to R _u . However, in the second stage PRB allocation, if the PRB of the D2D communication pair u is reused by a remaining D2D communication pair v (which is not assigned to any PRB in the first stage PRB allocation), the D2D communication can be used for u The data rate achieved will be changed to R _v,u in its PRB due to the factor being reused by the PRB. The D2D communication pair v can also achieve the data rate of R _{v, u} in the same PRB. Therefore, the total data rate of these PRBs in the case of reuse is the sum of the data rates of the two D2D communication pairs, ie the total data rate is equal to R _u,v + R _v,u . Therefore, the endpoint-to-endpoint data rate increment caused by resource reuse in these PRBs is equal to: α _v,u =( R _u,v + R _v,u )- R _u

Moreover, in the second stage PRB allocation, the eNB can set three transmission power levels for each of the remaining D2D communication pairs to perform power coordination to achieve the goal of ensuring that the data rate gain is reused in the PRB. The three transmission power levels may include a high power level, an intermediate power level, and a low power level, which respectively correspond to a maximum transmission power, a medium intensity transmission power, and a minimum transmission power.

表示在具有最大傳輸功率之其餘D2D通訊對v共享重新使用候選D2D通訊對u的PRB之情況下的數據速率增量。

表示在具有中間水平傳輸功率之其餘D2D通訊對v共享重新使用候選D2D通訊對u的PRB之情況下的數據速率增量，而

表示在具有最小水平傳輸功率之其餘D2D通訊對v共享重新使用候選D2D通訊對u的PRB之情況下的數據速率增量。對於一其餘D2D通訊對，最佳重新使用夥伴對及其餘D2D通訊對的最佳傳輸功率水平皆明確對應最大端點至端點間數據速率增量。舉例來說，在如第22圖所示的尋找程序中，對應其餘D2D通訊對1的最大數據速率增量為

，這意指其餘D2D通訊對1的最佳重新使用夥伴為重新使用候選 D2D通訊對2，且其餘D2D通訊對1的最佳傳輸功率水平為中間功率水平。類似地，其餘D2D通訊對2的最大數據速率增量為

，這意指其餘D2D通訊對2的最佳重新使用夥伴為重新使用候選D2D通訊對4，且其餘D2D通訊對2的最佳傳輸功率水平為高功率水平。 Figure 22 is a diagram showing an example of a two-dimensional optimal reuse partner seeking procedure performed by an eNB in a second-stage resource allocation according to an embodiment of the present disclosure. Suppose there are 5 re-use candidate D2D communication pairs, ie U = 5, and there are two remaining D2D communication pairs, ie, V = 2. For each of the remaining D2D communication pairs with each transmission power level, a data rate increment is obtained under different candidate partners, where

Represents the data rate increment in the case where the remaining D2D communication pair v with the largest transmission power shares the PRB of the candidate D2D communication pair u reused.

Representing the data rate increment in the case where the remaining D2D communication pair v with the intermediate horizontal transmission power shares the PRB of the candidate D2D communication pair u

Represents the data rate increment in the case where the remaining D2D communication pair v with the smallest horizontal transmission power shares the PRB of the candidate D2D communication pair u reused. For a remaining pair of D2D communication pairs, the optimal reuse power level for the best reuse partner pair and the remaining D2D communication pairs is explicitly corresponding to the maximum endpoint-to-endpoint data rate increment. For example, in the seek program as shown in FIG. 22, the maximum data rate increment corresponding to the remaining D2D communication pair 1 is

This means that the best reuse partner for the remaining D2D communication pair 1 is to reuse the candidate D2D communication pair 2, and the optimal transmission power level of the remaining D2D communication pair 1 is the intermediate power level. Similarly, the maximum data rate increment for the remaining D2D communication pair 2 is

This means that the best reuse partner for the remaining D2D communication pair 2 is to reuse the candidate D2D communication pair 4, and the optimal transmission power level of the remaining D2D communication pair 2 is a high power level.

Although there may be some D2D communication pairs that are not assigned any PRBs in the second stage allocation procedure, when the second stage PRB allocation procedure is completed, the entire scheduling procedure is completed.

Figure 23 is a flow chart 2300 showing a method for a plurality of user equipments (UEs) for allocating D2D communication resources according to an embodiment of the present disclosure. This method is used in a base station. In step S2305, the base station receives Channel State Information (CSI) reported by the UE. Next, in step S2310, the base station estimates the link quality of all D2D communication pairs based on the channel status information, wherein the link quality may be the end-to-endpoint data rate of all D2D communication pairs. In step S2315, the base station determines, according to the link quality, a suitable D2D communication mode for each D2D communication pair, wherein the suitable D2D communication mode is between a source UE and a destination UE, through a relay. The UE combines a connection between the source UE and the destination UE between the source UE and the destination UE. In step S2320, the base station allocates physical resource blocks (Physical Resource Blocks, PRBs) according to the link quality.

In an embodiment, the base station may allocate the PRBs of all D2D communication pairs according to the link quality using the first phase shown in FIG. When the base station determines that there is at least one D2D communication pair that is not assigned to any PRB, the base station may use the second phase allocation shown in FIG. 21 to obtain a data rate increment and according to The data rate increment is shared with the D2D communication pair by the assigned PRB.

In addition, central processor 208 can execute program code 212 to perform the acts and steps described in the above-described embodiments, or otherwise described in the specification.

The above embodiments are described using a variety of angles. It will be apparent that the teachings herein can be presented in a variety of ways, and that any particular architecture or function disclosed in the examples is merely representative. In light of the teachings herein, anyone skilled in the art will appreciate that the content presented herein can be independently rendered in various different types or in a variety of different forms. By way of example, it may be implemented by some means or by some means in any manner as mentioned in the foregoing. The implementation of one device or the execution of one mode may be implemented in any one or more of the types discussed above with any other architecture, or functionality, or architecture and functionality.

Those skilled in the art will understand that messages and signals can be presented in a variety of different technologies and techniques. For example, all of the data, instructions, commands, messages, signals, bits, symbols, and chips that may be referenced above may be volts, current, electromagnetic waves, magnetic or magnetic particles, light fields or light particles, or Any combination of the above is presented.

Those skilled in the art will appreciate that various illustrative logic blocks, modules, processors, devices, circuits, and logic steps are described herein for use with the electronic hardware (eg, source coded or Digital implementation of other technical designs, analogy implementation, or a combination of both), various forms of programming or design codes linked to instructions (referred to as "software" or "software modules" for convenience in the text), or a combination of the two. To clearly illustrate the interchangeability of the hardware and software, a variety of descriptive elements, blocks, modules, circuits, and steps are generally described above in terms of functionality. Whether this feature is presented in hardware or software, It will depend on the specific application and design constraints imposed on the overall system. The person skilled in the art can implement the described functions in a variety of different ways for each particular application, but the implementation of this decision should not be interpreted as deviating from the scope disclosed herein.

In addition, various illustrative logical blocks, modules, and circuits, and various aspects disclosed herein may be implemented in an integrated circuit (IC), an access terminal, an access point, or an integrated circuit. , access terminal, access point execution. The integrated circuit can be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programmable logic device, Discrete Gate or Transistor Logic, discrete hardware components, electronic components, optical components, mechanical components, or any combination of the above to perform the functions described herein And may execute an execution code or instruction that exists in the integrated circuit, outside the integrated circuit, or both. A general purpose processor may be a microprocessor, but could be any conventional processor, controller, microcontroller, or state machine. The processor may be comprised of a combination of computer devices, such as a combination of a digital signal processor and a microcomputer, a plurality of sets of microcomputers, a set of at most one set of microcomputers, and a digital signal processor core, or any other similar configuration.

Any specific sequence or layering of the procedures disclosed herein is by way of example only. Based on design preferences, it must be understood that any specific order or hierarchy of steps in the program may be rearranged within the scope of the disclosure. The accompanying claims are intended to be illustrative of a

In the scope of the patent application, the "first" and "second" used to modify the components, The use of ordinal numbers such as "third" does not imply any prioritization, prioritization, prioritization between elements, or the order in which the method is performed, but only as an identifier to distinguish between having the same name. Different components of different ordinal numbers).

Although the disclosure has been described above by way of example, it is not intended to limit the scope of the present invention, and the scope of protection of the present invention can be made without departing from the spirit and scope of the disclosure. This is subject to the definition of the scope of the patent application.

400‧‧‧Information flow chart

S405, S410, S415, S420, S425, S430‧‧ steps

Claims (24)

A communication device for transmitting a plurality of data packets in a wireless network includes at least: a control circuit; a processor disposed in the control circuit; and a memory disposed in the control circuit and coupled to the foregoing The processor is configured to execute a code stored in the memory to perform: receiving one or more first Medium Access Control (MAC) protocol data units (Protocol Data Units, a PDU), which includes a plurality of Radio Link Control (RLC) PDUs, the RLC PDUs are from a source device (User Equipment, UE) of the wireless network, and are expected to be transmitted to a destination UE; Deactivating a first MAC PDU of the first MAC PDU to demultiplex the first MAC PDU to retrieve the RLC PDU; generating a plurality of one or more of the foregoing RLC PDUs according to one or more MAC PDU sizes RLC PDU segmentation or a plurality of relay RLC (RRLC) PDUs generated by all the foregoing RLC PDUs, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; multiplex operation (mul Tiplex) the foregoing RLC PDU and the foregoing RLC PDU segment or the RRLC PDU are one or more second MAC PDUs; and transmitting the second MAC PDU to the destination UE. The communication device of claim 1, wherein one of the RLC PDU segments re-segmentates one of the RLC PDUs according to one of the MAC PDU sizes and adds a re-segmentation information. Generated in a header field of one of the above RLC PDUs. The communication device of claim 1, wherein the RRLC PDU divides and concatenates the RLC PDU according to the MAC PDU size, and adds a header including a split and link information to each RRLC PDU. Produced. The communication device of claim 1, wherein the MAC PDU size is obtained according to one or more resource re-deliverys transmitted by a base station. The communication device of claim 1, wherein the RLC PDU and the RLC PDU segment or the RRLC PDU are multiplexed into the second MAC PDU according to a priority order. The communication device of claim 5, wherein the prioritization is based on a First-in First-out (FIFO) principle or a Quality of Service (QoS) parameter. A method for transmitting a plurality of data packets in a wireless network for use in a communication device, the method comprising the steps of: receiving one or more first Medium Access Control (MAC) protocol data units (Protocol Data Unit, PDU), which includes a plurality of Radio Link Control (RLC) PDUs, the above RLC The PDU is from a source device (UE) of the wireless network and is expected to be transmitted to a user equipment (User Equipment, UE); according to a header field solution of each first MAC PDU Demultiplexing the first MAC PDU to retrieve the RLC PDU; generating a plurality of RLC PDU segments from one or more of the RLC PDUs according to one or more MAC PDU sizes or generating a plurality of the foregoing RLC PDUs Relay RLC (RRLC) PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; multiplexing the RLC PDU and the RLC PDU segment or the RRLC The PDU is one or more second MAC PDUs; and the foregoing second MAC PDU is transmitted to the destination UE. The method for transmitting a plurality of data packets as described in claim 7, wherein one of the RLC PDU segments re-segmentates one of the RLC PDUs according to one of the MAC PDU sizes. And adding a re-segmentation information to a header field of one of the RLC PDUs mentioned above. The method for transmitting a plurality of data packets according to claim 7, wherein the RRLC PDU divides and concatenates the RLC PDU according to the MAC PDU size and adds a header including a split and link information. Generated in each RRLC PDU. The method for transmitting a plurality of data packets as described in claim 7, wherein the MAC PDU size is obtained according to one or more resource grants transmitted by a base station. The method for transmitting a plurality of data packets as described in claim 7, wherein the RLC PDU and the RLC PDU segment or the RRLC PDU are multiplexed into the second MAC PDU according to a priority order. The method for transmitting a plurality of data packets as described in claim 11 wherein the prioritization is based on a First-in First-out (FIFO) principle or Quality of Service (QoS). parameter. A communication device for receiving a plurality of data packets in a wireless network, comprising: at least: a control circuit; a processor disposed in the control circuit; and a memory disposed in the control circuit and coupled to the The processor is configured to execute a code stored in the memory to perform: receiving and directly receiving a wireless network from the user equipment through a relay user equipment (User Equipment, UE) One or more Medium Access Control (MAC) Protocol Data Units (PDUs) of the source UE, where the MAC PDU is composed of multiple wireless a Radio Link Control (RLC) PDU and a plurality of RLC PDU segments; demultiplexing the MAC PDU according to a header field of each MAC PDU to retrieve the RLC PDU and the foregoing RLC PDU segmentation; reordering the RLC PDU and the RLC PDU segment according to Transmission Sequence Numbers (TSNs), and performing a repeated detection of the RLC PDU and the RLC PDU segment, wherein each transmission sequence number is Included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and reassembling the information using the information included in each of the RLC PDUs and each of the above-described header fields of each RLC PDU segment The RLC PDU and the above RLC PDU are segmented into a plurality of RLC Service Data Units (SDUs). A communication device for receiving a plurality of data packets in a wireless network, comprising: at least: a control circuit; a processor disposed in the control circuit; and a memory disposed in the control circuit and coupled to the The processor is configured to execute a code stored in the memory to perform: receiving a source from the wireless network through a relay user equipment (User Equipment, UE) and a base station Multiple first media access control of the UE A Medium Access Control (MAC) protocol data unit (PDU), wherein the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs, wherein the RRLC PDU is one a PDU of a protocol layer between the MAC layer and the RLC layer, and directly receiving a plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is segmented by the plurality of first RLC PDUs and the plurality of first RLC PDUs Composing: demultiplexing the first MAC PDU according to a header field of each first MAC PDU to retrieve the RRLC PDU, and decoding according to one of the header fields of each second MAC PDU The second MAC PDU is operated to capture the first RLC PDU and the first RLC PDU segment; the RRLC PDU is reordered according to Transmission Sequence Numbers (TSNs), and a repetition detection of the RRLC PDU is performed. Each of the transmission sequence numbers is included in a header field of each of the RRLC PDUs; the RRLC PDU is reassembled to the plurality of second RLC PDUs using information of the header fields included in each of the RRLC PDUs a plurality of second RLC PDU segments; Retransmitting the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment, and performing the foregoing first RLC PDU, the first RLC PDU segment, and the foregoing a repeated detection of the second RLC PDU and the second RLC PDU segment, Each of the transmission sequence numbers is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and the above-mentioned header field included in each of the RLC PDUs and each of the RLC PDU segments described above is used. And the information is used to reassemble the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment into a plurality of RLC Service Data Units (SDUs). A method for receiving a plurality of data packets in a wireless network for use in a communication device, the method comprising the steps of: receiving and directly receiving through a relay user equipment (User Equipment, UE), a base station One or more Medium Access Control (MAC) Protocol Data Units (PDUs) from one of the above-mentioned wireless networks, wherein the MAC PDUs are controlled by a plurality of radio links (Radio) a Link Control (RLC) PDU and a plurality of RLC PDU segments; demultiplexing the MAC PDU according to a header field of each MAC PDU to retrieve the RLC PDU and the RLC PDU segment; Transmit Sequence Numbers (TSNs) reorder the RLC PDUs and the RLC PDU segments, and perform a repetition detection of the RLC PDUs and the RLC PDU segments, where each transmission sequence number is included in each RLC PDU. And one of the header fields of each RLC PDU segment; The RLC PDU and the RLC PDU segment are reassembled into a plurality of RLC Service Data Units (SDUs) using information included in each of the RLC PDUs and the header field of each of the RLC PDU segments. A method for receiving a plurality of data packets in a wireless network for use in a communication device, the method comprising the steps of: receiving, by a relay user equipment (User Equipment, UE) and a base station, the wireless a first medium access control (MAC) protocol data unit (PDU) of the source UE of the network, wherein the first MAC PDU is a multiple relay RLC (Relay RLC, RRLC) a PDU, wherein the RRLC PDU is a PDU of a protocol layer between a MAC layer and an RLC layer, and directly receives a plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is Composing a plurality of first RLC PDUs and a plurality of first RLC PDU segments; demultiplexing the first MAC PDU according to a header field of each first MAC PDU to retrieve the RRLC PDU, and according to Decoding a header field of each second MAC PDU to operate the second MAC PDU to retrieve the first RLC PDU and the first RLC PDU segment; and reorder according to Transmission Sequence Numbers (TSNs) The above RRLC PDU, And performing a repeated detection of the RRLC PDU, where each transmission sequence number is included in one of the header fields of each RRLC PDU; Recombining the RRLC PDU into the plurality of second RLC PDUs and the plurality of second RLC PDU segments by using the information of the foregoing header fields included in each of the RRLC PDUs; reordering the first RLC PDU according to the transmission sequence number, a first RLC PDU segment, the foregoing second RLC PDU, and the second RLC PDU segment, and performing the foregoing first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment Repeat detection, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; and the segmentation used in each of the RLC PDUs and each of the RLC PDU segments described above The information in the header field to reassemble the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment into a plurality of RLC service data units (SDUs) ). A method for allocating Device-to-Device (D2D) communication resources for a plurality of User Equipments (UEs) for use in a base station, the method comprising the steps of: receiving the report reported by the UE Channel status information; estimating link quality of all D2D communication pairs according to the channel status information; determining a suitable D2D communication mode of each D2D communication pair according to the link quality; and Physical Resource Blocks (PRBs) are allocated according to the above link quality. The method for allocating an inter-device communication resource for a plurality of user equipments as described in claim 17, the method further comprising: determining whether there is at least one D2D communication pair to which no PRB is allocated; and when determining that there is unallocated When the at least one D2D communication pair of any of the PRBs is paired, the allocated PRB is shared with the at least one D2D communication pair according to a data rate increase. The method for allocating inter-device communication resources for a plurality of user equipments as described in claim 17, wherein the suitable D2D communication mode is between a source UE and a destination UE, through a relay The UE combines a connection between the source UE and the destination UE between the source UE and the destination UE. A communication system for device-to-device (D2D) communication in a wireless network, comprising at least: a source device (User Equipment, UE); a destination UE; a relay UE And a base station receiving channel status information reported by the source UE, the destination UE, and the relay UE; wherein the base station estimates link quality of all D2D communication pairs according to the channel status information, according to the foregoing Link quality is determined from the above source UE a suitable D2D communication mode of the destination UE, and transmitting a resource grant to the source UE to instruct the source UE to transmit a data packet to the destination UE in the suitable D2D communication mode; The above-mentioned suitable D2D communication mode is between the source UE and the destination UE, and between the source UE and the destination UE through the relay UE or through the base station at the source UE and the foregoing A connection combination between UEs at the destination end. The communication system for inter-device communication according to claim 20, wherein the suitable D2D communication mode is the connection combination between the source UE and the destination UE through the relay UE. The relay UE further includes: a control circuit; a processor disposed in the control circuit; and a memory disposed in the control circuit and coupled to the processor; wherein the processor is configured to execute a The code stored in the memory is configured to: receive one or more first Medium Access Control (MAC) Protocol Data Units (PDUs) including multiple radio link control (Radio) a Link Control (RLC) PDU, the PDU is from the source UE of the wireless network and is expected to be transmitted to the destination UE; Demultiplexing the first MAC PDU to retrieve the RLC PDU according to a header field of each first MAC PDU; generating one or more of the foregoing RLC PDUs according to one or more MAC PDU sizes Multiple RLC PDU segments or a plurality of relay RLC (RRLC) PDUs generated by all of the foregoing RLC PDUs, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; First-in First-out (FIFO) principle multiplexes the RLC PDU and the RLC PDU segment or the RRLC PDU as one or more second MAC PDUs; and transmits the second MAC PDU to the foregoing Destination UE. The communication system for inter-device communication according to claim 20, wherein the destination UE further comprises at least: a control circuit; a processor disposed in the control circuit; and a memory disposed on the The processor is coupled to the processor, wherein the processor is configured to execute a code stored in the memory to perform: receiving, by the relay UE, the base station, and directly receiving, from the source UE One or more Medium Access Control (MAC) Protocol Data Units (PDUs), wherein the MAC PDUs are composed of a plurality of Radio Link Control (RLC) PDUs and a plurality of RLC PDUs. Composed of segments; Demultiplexing the MAC PDU according to a header field of each MAC PDU to retrieve the RLC PDU and the RLC PDU segment; and reordering the RLC PDU and the RLC PDU according to Transmission Sequence Numbers (TSNs) Segmenting and performing a repeated detection of the RLC PDU and the RLC PDU segment, wherein each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; Recombining the RLC PDU and the RLC PDU segment into a plurality of RLC Service Data Units (SDUs) in each of the RLC PDUs and the information in the header field of each of the RLC PDU segments. The communication system for inter-device communication according to claim 20, wherein the destination UE further comprises at least: a control circuit; a processor disposed in the control circuit; and a memory disposed on the The processor is coupled to the processor, wherein the processor is configured to execute a code stored in the memory to perform: receiving, by the relay UE and the base station, a plurality of bits from the source UE A medium access control (MAC) protocol data unit (PDU), wherein the first MAC PDU is composed of a plurality of relay RLC (RRLC) PDUs, wherein the RRLC PDU system is a PDU between a MAC layer and an RLC layer, And directly receiving the plurality of second MAC PDUs from the source UE, wherein the second MAC PDU is composed of a plurality of first RLC PDUs and a plurality of first RLC PDU segments; according to one of each first MAC PDU header The field demultiplexes the first MAC PDU to retrieve the RRLC PDU, and multiplexes the second MAC PDU according to a header field of each second MAC PDU to obtain the first RLC PDU and the first RLC PDU segment; reordering the RRLC PDU according to Transmission Sequence Numbers (TSNs), and performing a repeated detection of the RRLC PDU, where each transmission sequence number is included in each RRLC PDU In one of the header fields, recombining the RRLC PDU into the plurality of second RLC PDUs and the plurality of second RLC PDU segments by using the information of the foregoing header fields included in each of the RRLC PDUs; Sorting the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second RLC PDU segment, and performing the foregoing first RLC PDU, the first RLC PDU segment, and the second RLC PDU And the second RLC PDU segmentation described above a repeat detection in which each transmission sequence number is included in each of the RLC PDUs and one of the header fields of each RLC PDU segment; Recombining the first RLC PDU, the first RLC PDU segment, the second RLC PDU, and the second by using information included in each of the RLC PDUs and each of the foregoing header fields of each RLC PDU segment The RLC PDU is segmented into a plurality of RLC Service Data Units (SDUs). The communication system for inter-device communication according to claim 20, wherein the suitable D2D communication mode is the connection combination between the source UE and the destination UE through the base station, The base station further includes: a control circuit; a processor disposed in the control circuit; and a memory disposed in the control circuit and coupled to the processor; wherein the processor is configured to perform a The code of the memory is configured to: receive one or more first Medium Access Control (MAC) Protocol Data Units (PDUs) including multiple radio link control (Radio Link Control) , RLC) PDU, the RLC PDU is from a source device (User Equipment, UE) of the foregoing wireless network and is expected to be transmitted to a destination UE; and according to a header field of each first MAC PDU Operating the first MAC PDU to retrieve the RLC PDU; generating a plurality of RLC PDU segments from one or more of the RLC PDUs according to one or more MAC PDU sizes or by all of the foregoing RLCs Generated in the PDU Following a RLC (Relay RLC, RRLC) PDU, wherein the RRLC is a protocol layer between a MAC layer and an RLC layer; according to a first-in first-out (FIFO) principle or service quality (Quality of Service, QoS) parameter multiplexing (multiplex) the RLC PDU and the RLC PDU segment or the RRLC PDU as one or more second MAC PDUs; and transmitting the second MAC PDU to the destination UE.