CN108307472B

CN108307472B - Communication method and device of equipment through system and communication system

Info

Publication number: CN108307472B
Application number: CN201610668261.XA
Authority: CN
Inventors: 汪梦珍; 陈琳; 陈玉芹; 黄莹
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2023-06-30
Anticipated expiration: 2036-08-12
Also published as: WO2018028694A1; CN108307472A

Abstract

The invention provides a communication method and device of a device direct connection system and a communication system, wherein the method comprises the following steps: the UE receives PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function; and the UE is configured according to the PC5 interface configuration information.

Description

Communication method and device of equipment through system and communication system

Technical Field

The present invention relates to the field of communications, and in particular, to a communication method and apparatus for a device direct connection system, and a communication system.

Background

With the development of wireless multimedia services, there is an increasing demand for high data rates and user experiences, thereby placing higher demands on the system capacity and coverage of conventional cellular networks. On the other hand, public security, social networking, close-range data sharing, local advertising, etc. application scenarios have led to an increasing need for people to learn about and communicate with nearby people or things (Proximity Services ). Conventional base station-centric cellular networks have significant limitations in terms of high data rates and support for proximity services, and in the context of this demand, D2D (Device-to-Device) technology has grown in the new direction of future communication technology development. The application of the D2D technology can reduce the burden of a cellular network, reduce the battery power consumption of user equipment, improve the data rate, improve the robustness of network infrastructure and well meet the requirements of the high data rate service and the proximity service. Current D2D technology is also known as proximity services (Proximity Services, proSe), single-edge link (SL).

D2D technology may operate in an licensed or unlicensed frequency band, allowing multiple D2D-capable User equipments (i.e., D2D User equipments, D2D UEs) to conduct direct discovery/direct communication with or without a network infrastructure. The interface between D2D UEs is referred to as the PC5 interface. D2D technologies generally include D2D discovery technology and D2D communication technology, wherein D2D discovery technology refers to technology for judging/determining that two or more D2D user equipments are adjacent to each other (e.g., within a range where D2D direct communication is possible). In general, the D2D user equipments may discover each other by transmitting or receiving discovery signals/information. D2D communication technology refers to a technology in which some or all of communication data between D2D user equipments may be directly communicated without through a network infrastructure.

On the other hand, with the development of the demand for interconnection of everything, standardization of machine type communication (MTC, machine Type communication) by 3GPP has been basically completed, and standardization of NB-IoT (Narrow Band-Internet of Things) is currently being performed. Wherein R13eMTC adds coverage enhancement support and bandwidth limited support on the basis of supporting low cost. Generally, the radio frequency capability of eMTC User Equipment (UE) is limited to 1.4MHz, while the radio frequency transmit/receive bandwidth of NB-IoT devices is limited to 180kHz. Coverage enhancement is typically achieved between the eNB and eMTC/NB-IoT UEs through multiple repetitions of data transmission. In view of the low cost nature of eMTC/NB-IoT devices, it is often desirable to extend the lifetime of eMTC/NB-IoT devices as much as possible, while coverage enhancement in particular can result in multiple retransmissions of data packets, thereby quickly draining the UE's power. In addition to eMTC devices and NB-IoT devices, wearable devices also have similar application requirements, such as low cost, low power consumption/power saving, high data rates, etc.

One possible solution is to support access of wearable/eMTC/NB-IoT devices (remote UEs or remote UEs) to the network by way of D2D communication, i.e. the remote UEs may connect to relay nodes (relay UEs or relay UEs) that the UEs act as, communicate with the relay UEs in D2D, and communicate with the network through the relay UEs. D2D communications between the remote UE and the relay UE include, but are not limited to, sidelink/PC5 communications, WLAN, blueTooth. For the remote UE accessing the relay UE through the sidelink/PC5 or the non-3GPP (WLAN, blueTooth), how to support the bearer configuration and management of the relay UE forwarding the remote UE data, the prior art does not provide a perfect solution for the system.

Disclosure of Invention

The embodiment of the invention provides a communication method, a device and a communication system of a device through system, which at least solve the problem that a solution for supporting bearer configuration and management of relay UE forwarding remote UE data is not available in the related art.

According to an embodiment of the present invention, there is provided a communication method of a device through system, including: a User Equipment (UE) receives PC5 interface configuration information, wherein the PC5 interface configuration information is used to configure the UE to support a device-to-device D2D communication function; and the UE is configured according to the PC5 interface configuration information.

According to still another aspect of the embodiment of the present invention, there is provided a communication method for relaying through a system of a device, including: the base station transmits PC5 interface configuration information to the user equipment UE, wherein the PC5 interface configuration information is used to configure the UE to support the device-to-device D2D communication function.

According to an aspect of an embodiment of the present invention, there is provided a communication method of a device through system, including: the remote UE accesses and/or connects to the relay UE; and the remote UE forwards data through the relay UE.

According to an aspect of the embodiment of the present invention, there is provided a communication method for relaying through a system of a device, including: the base station receives relay related configuration information, wherein the relay related configuration information is used for remote UE discovery, measurement, selection and access to relay UE; and the base station executes processing corresponding to the relay related configuration information according to the relay related configuration information.

According to still another aspect of the embodiments of the present invention, there is provided a communication apparatus of a device pass-through system, applied to a user equipment UE, the apparatus including: the receiving module is used for receiving PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function; and the configuration module is used for carrying out configuration according to the PC5 interface configuration information.

According to still another aspect of the embodiments of the present invention, there is provided a communication apparatus of a device pass-through system, applied to a remote user equipment UE, the apparatus including: an access module for accessing and/or connecting to the relay UE; and the forwarding module is used for forwarding data through the relay UE.

According to still another aspect of an embodiment of the present invention, there is provided a communication system including: the system comprises User Equipment (UE) and a base station, wherein the UE is used for receiving PC5 interface configuration information sent by the base station and configuring according to the PC5 interface configuration information, and the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function.

According to still another aspect of an embodiment of the present invention, there is provided a communication system including: a remote user equipment UE and a relay UE, wherein the remote UE is configured to access and/or connect to the relay UE and forward data through the relay UE.

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is arranged to store program code for performing the steps of: a User Equipment (UE) receives PC5 interface configuration information, wherein the PC5 interface configuration information is used to configure the UE to support a device-to-device D2D communication function; and the UE is configured according to the PC5 interface configuration information.

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is arranged to store program code for performing the steps of: the base station receives relay related configuration information, wherein the relay related configuration information is used for remote UE discovery, measurement, selection and access to relay UE; and the base station executes processing corresponding to the relay related configuration information according to the relay related configuration information.

According to yet another embodiment of the present invention, another storage medium is also provided. The storage medium is arranged to store program code for performing the steps of: the base station transmits PC5 interface configuration information to the user equipment UE, wherein the PC5 interface configuration information is used to configure the UE to support the device-to-device D2D communication function.

According to the invention, the UE can receive the PC5 interface configuration information or the base station can receive the relay related configuration information, so that the relay UE can be supported to forward the bearing configuration and management of w-UE data, and the problem that a solution for supporting the bearing configuration and management of the relay UE to forward the remote UE data is not available in the related technology can be solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

Fig. 1 is a schematic diagram of a wearable device accessing a network communication scenario through a relay UE according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method of communication of a device pass-through system according to an embodiment of the invention;

fig. 3 is a block diagram of a communication apparatus of the facility pass-through system according to an embodiment of the present invention;

FIG. 4 is a flow chart of another method of communication of a device pass-through system according to an embodiment of the invention;

fig. 5 is a block diagram of another communication apparatus of the facility pass-through system according to an embodiment of the present invention;

FIG. 6 is a flow chart of another method of communication of a device pass-through system according to an embodiment of the invention;

FIG. 7 is a flow chart of another method of communication of a device pass-through system according to an embodiment of the invention;

fig. 8 is a flow chart of relay forwarding bearer establishment and communication according to example 1 of the present invention;

fig. 9 is a flow chart of relay forwarding bearer establishment and communication according to example 2 of the present invention;

fig. 10 is a flow chart of relay forwarding bearer establishment and communication according to example 3 of the present invention;

fig. 11 is a flow chart of another relay forwarding bearer establishment and communication according to example 3 of the present invention;

fig. 12 is a flow chart of relay forwarding bearer establishment and communication according to example 4 of the present invention;

FIG. 13 is a flow chart of an example 6PC5 bearer modification of the present invention;

FIG. 14 is a flow chart of the bearer release for example 6PC5 of the present invention;

fig. 15 is a flowchart of implementing PC5 bearer relay forwarding by UE according to example 7 of the present invention;

fig. 16 is a relay forwarding flow chart for example 8 of the present invention through WLAN access;

fig. 17 is a flowchart of another relay forwarding through WLAN access according to example 9 of the present invention;

FIG. 18 is a flow chart of the invention example 10S1 interface interaction relay related information;

fig. 19 is a flowchart of example 11X2 interface interaction relay related information of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

There are bearer configuration and management issues in the related art as to what support relay UEs to forward remote UE data, including but not limited to wearable/eMTC/NB-IoT devices (w-UEs). By the method provided by the invention, the w-UE and the relay UE establish communication connection, and the negotiation configuration and Uu bearer configuration of the PC5 bearer for forwarding the w-UE data by the relay UE are carried out, so that the w-UE is ensured to smoothly communicate with the network through the relay UE.

One possible solution to the above problem is to support the wearable/eMTC/NB-IoT devices (w-UE or remote UE) to access the network by means of D2D communication, i.e. as shown in fig. 1, the w-UE may be connected to a relay node (relay UE or r-UE) that the UE acts as, communicating with the r-UE in D2D, and the r-UE is responsible for forwarding the data packets of the w-UE to or from the network to the w-UE. In addition, according to the R14feD2D requirement, the w-UE can also access the relay node by a non-3GPP (non-3 GPP) mode (such as WLAN, blueTooth), so that the extended coverage and network communication can be achieved. In this way, the w-UE can fully utilize the D2D/WLAN/BT communication to save power, and has the characteristics of high speed, extended coverage and the like.

It should be noted that, UEs mentioned in the embodiments of the present application include, but are not limited to, wearable UEs, MTC, ioT devices, and the like.

Fig. 2 is a flow chart of a communication method of the device pass-through system according to an embodiment of the present invention. As shown in fig. 2, the method includes:

step S202, the UE receives PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function;

optionally, the PC5 interface configuration information includes at least one of: the method comprises the steps of carrying configuration information by a PC5, carrying configuration information by a PC5 logical channel, carrying mapping information between Uu logical channel priority and the PC5 logical channel, carrying mapping information between the priority of a PC5 data packet and a service quality class identifier QCI carried by Uu, and carrying relay forwarding indication information.

In step S204, the UE configures according to the PC5 interface configuration information.

Optionally, the UE includes: remote UE and/or relay UE; the UE receiving PC5 interface configuration information includes: the remote UE receives PC5 bearing configuration information sent by a base station; and/or the relay UE receives PC5 bearing configuration information sent by the base station; and/or the remote UE or the relay UE receives relay forwarding instruction information sent by a base station; and/or the remote UE receives mapping information between a PC5 logical channel group and Uu logical channel priority sent by a base station or mapping information between a PC5 data packet priority and Uu bearer QCI; and/or the relay UE receives mapping information between the PC5 logical channel group and Uu logical channel priority of the remote UE sent by the base station.

Wherein, the PC5 carries configuration information including one or any combination of the following: the PC5 bears the establishment configuration information; the PC5 carries the configuration information; the PC5 carries release information.

Wherein, the PC5 bearer establishment configuration information includes at least one of the following: PC5 carries the identification, radio link control protocol acknowledged mode RLC AM configuration information, radio link control protocol unacknowledged mode RLC UM configuration information, logical channel identification LC ID, logical channel group identification LCG ID, priority guaranteed bit rate PBR, bucket size duration BSD, UE PC5 interface aggregate maximum bit rate, PC5 carries QoS information. Wherein, the above-mentioned PC5 bears QoS information and includes at least one of the following: the quality of service class QCI, guaranteed bit rate GBR, maximum bit rate MBR.

Optionally, the RLC AM configuration information includes at least one of: RLC AM mode sequence number length, poll retransmission timer (t-poll retransmission), poll protocol data unit (poll pdu), poll byte count (poll byte), maximum retransmission threshold (maxRetxThreshold) (also known as maximum number of retransmissions), reorder timer (t-reorder), status prohibit timer (t-status inhibit); the RLC UM mode configuration information includes any combination of: unacknowledged mode sequence number field length (sn-FieldLength), maximum retransmission threshold (maxRetxThreshold), reorder timer (t-reorder).

Optionally, the configuration of the EPS bearer or Uu bearer of the UE is multiplexed by the PC5 bearer identifier, the logical channel identifier, and the logical channel group identifier in the PC5 bearer establishment configuration information.

Optionally, the PC5 bearer modification configuration information is used to update or reconfigure any field combination in the PC5 bearer establishment configuration information; the PC5 carries release information including at least one of: the PC5 carrying the identity or logical channel identity needs to be released, releasing the reason.

Optionally, the relay forwarding indication information received by the remote UE includes at least one of the following: relay UE identity (which may be represented, for example, by ProSe layer-2 ID); the control plane forwards the indication; a user plane forwarding indication; an uplink forwarding indication; a downlink forwarding indication; the EPS bearing identification forwarded by the relay; a DRB identifier forwarded by the relay; a logical channel identifier forwarded by the relay; an uplink data forwarding instruction corresponding to each EPS bearer, a downlink data forwarding instruction corresponding to each EPS bearer, and uplink and downlink data forwarding instructions corresponding to each EPS bearer;

The relay forwarding indication information received by the relay UE includes at least one of the following: the method comprises the steps of identifying a remote UE, forwarding an indication of a control plane of the remote UE, forwarding an indication of a user plane of the remote UE, forwarding an indication of an uplink of the remote UE, forwarding an indication of a downlink of the remote UE, forwarding an indication of an uplink data forwarding, an indication of a downlink data forwarding, an indication of uplink and downlink data forwarding corresponding to an EPS bearer of the remote UE, and forwarding EPS bearer information of the remote UE; wherein the EPS bearer information includes at least one of: EPS bearer identity, QCI, GBR, MBR.

Optionally, the UE configures according to the PC5 interface configuration information, including: the remote UE and the relay UE establish or modify or release PC5 bearing;

optionally, the establishing the PC5 bearer by the remote UE and the relay UE includes: the remote UE sends PC5 bearer establishment configuration information to the relay UE; the remote UE receives the PC5 bearer establishment completion information sent by the relay; and/or the relay UE sends PC5 bearer establishment configuration information to the remote UE; and the relay UE receives the PC5 bearer establishment completion information sent by the remote UE. Optionally, the PC5 bearer establishment configuration information and the PC5 bearer establishment completion information may be carried by: PC5NAS signaling message, or PC5AS signaling message.

Optionally, after the remote UE sends the PC5 bearer establishment configuration information to the relay UE, the method further includes: the relay UE receives PC5 bearer establishment configuration information sent by the remote UE; and/or the relay UE performs admission control on the remote UE; and/or the relay UE judges whether to establish a forwarding Uu bearer, wherein the forwarding Uu bearer is used for forwarding the remote UE data to the base station by the relay UE.

Optionally, the relay UE performs admission control on the remote UE, including: the relay UE determines whether to accept to establish a new PC5 bearer according to the received PC5 bearer QoS information in the PC5 bearer establishment configuration information sent by the remote UE and the quantity and resource load conditions of the established PC5 bearers of the relay UE; or the relay UE sends the remote UE identification to a base station, and the base station determines whether to allow the relay UE to accept and establish PC5 bearing according to the resource scheduling/allocation condition.

Optionally, the relay UE determines whether to establish a forwarding Uu bearer, including: and the relay UE determines whether a forwarding Uu bearer meeting the requirement exists according to PC5 bearer QoS information in PC5 bearer establishment configuration information sent by the remote UE and EPS bearer list information maintained by the relay UE, and if not, the relay UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to a network to establish or modify the forwarding Uu bearer.

Optionally, the service request, the bearer resource allocation request or the bearer resource modification request message initiated by the relay UE to the network carries a forwarding bearer indication, where the forwarding bearer indication is used to indicate to the network that the bearer is used to forward the remote UE data.

Optionally, after the relay UE receives the relay forwarding instruction information sent by the base station, the relay UE determines whether to establish a forwarding Uu bearer, where the forwarding Uu bearer is used for forwarding remote UE data to the base station by the relay UE; and the relay UE transmits relay forwarding response information to the base station.

The relay forwarding response information includes: relay forwarding acceptance information or relay forwarding rejection information, wherein the relay forwarding acceptance information includes: the EPS list of the remote UE that is allowed to be forwarded through the relay and the EPS list that is rejected to be forwarded through the relay.

Optionally, after the relay UE receives the PC5 bearer configuration information sent by the base station or the relay UE sends the relay forwarding response information to the base station, the method further includes: the relay UE receives establishment configuration information for forwarding Uu bearer from a base station; the establishment configuration information of the forwarding Uu bearer includes at least one of: uu DRB identification, packet data convergence protocol PDCP configuration, RLC configuration, logical channel identification and logical channel configuration.

Optionally, after the relay UE receives the relay forwarding indication information sent by the base station, the method includes: and the relay UE sends an EPS bearing list which is allowed to be forwarded through the relay and an EPS bearing list which is refused to be forwarded through the relay to the base station.

Optionally, before the remote UE receives the relay forwarding indication information sent by the base station, the remote UE sends relay forwarding interest indication information to the base station through RRC dedicated signaling, where the relay forwarding interest indication information includes at least one of the following: relay forwarding interest, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer list expected to be forwarded by relay. The remote UE sends a relay forwarding interest indication to the eNB in an Attach request or a service request or through RRC dedicated signaling.

Optionally, the UE is configured according to the PC5 interface configuration information, including at least one of the following: the remote UE or the relay UE completes the configuration of the PC5 bearer according to the received configuration information of the PC5 bearer, and sends an RRC reconfiguration completion message to the base station to inform the PC5 of the completion of the bearer establishment; the remote UE or the relay UE completes PC5 bearer modification according to the received PC5 bearer modification configuration information, and sends RRC reconfiguration completion information to the base station to inform the PC5 of completion of bearer modification; the remote UE or the relay UE completes PC5 bearer release according to the received PC5 bearer release information; the remote UE associates the data of the EPS bearing needing to be forwarded by the relay UE with the corresponding PPPP according to the QCI of the EPS bearing according to the received relay forwarding indication information and the mapping information of the priority PPPP and the Uu bearing QCI of the PC5 data packet, and transmits the data through a PC5 interface; the remote UE associates the data of the EPS bearing which is required to be forwarded by the relay UE with the corresponding PPPP according to the received relay forwarding indication information and the mapping information of the preconfigured PPPP and Uu bearing QCI, and transmits the data through a PC5 interface; the remote UE associates the data of EPS bearing which is required to be forwarded by the relay UE with corresponding PPPP according to the received relay forwarding indication information and the mapping information between the PC5 logic channel group and Uu logic channel priority, and transmits the data through a PC5 interface; and the remote UE establishes a one-to-one correspondence between the PC5 bearer identification or the PC5 logical channel identification in the configuration information or the PC5 bearer identification or the PC5 logical channel identification generated by the remote UE and the EPS bearer identification or Uu DRB identification or Uu logical channel identification of the corresponding EPS bearer according to the received PC5 bearer, and maps the data of the EPS bearer which needs to be forwarded by the relay UE to the corresponding PC5 bearer/PC 5 logical channel transmission.

The embodiment also provides a communication device of the equipment direct connection system, which is applied to the UE, as shown in fig. 3, and the device includes:

a receiving module 30, configured to receive PC5 interface configuration information, where the PC5 interface configuration information is used to configure a UE to support a device-to-device D2D communication function;

optionally, the PC5 interface configuration information includes at least one of:

the method comprises the steps of carrying configuration information by a PC5, carrying configuration information by a PC5 logical channel, carrying mapping information between Uu logical channel priority and the PC5 logical channel, carrying mapping information between the priority of a PC5 data packet and a service quality class identifier QCI carried by Uu, and carrying relay forwarding indication information.

The configuration module 32 is configured according to the PC5 interface configuration information.

The embodiment of the invention also provides another communication method of the equipment through system, as shown in fig. 4, the method comprises the following processing steps:

step S402, the remote UE accesses and/or connects to the relay UE;

in step S404, the remote UE forwards the data through the relay UE.

Optionally, the relay access manner supported by the remote UE and the relay UE includes at least one of the following: a sidelink or PC5 interface, WLAN, bluetooth; the remote UE is accessed to/connected with the relay UE through the sidelink or PC 5; or the remote UE accesses the relay UE through the WLAN; or the remote UE accesses the relay UE through Bluetooth.

Optionally, before the remote UE accesses and/or connects to the relay UE, the remote UE receives relay related configuration information sent by the base station, where the relay related configuration information is used for the remote UE to discover, measure, select and access the relay UE; and the remote UE completes configuration according to the relay related configuration information.

Optionally, the relay related configuration information includes at least one of: relay measurement threshold, relay discovery threshold, relay selection hysteresis value, relay discovery transmission/reception resource, WLAN measurement threshold, WLAN measurement configuration information, WLAN selection threshold, WLAN selection hysteresis value, blueTooth selection threshold, blueTooth selection hysteresis value;

optionally, before the remote UE receives the relay related configuration information sent by the base station, the method further includes: and the remote UE sends a relay forwarding interest indication to the base station.

Optionally, the relay forwarding interest indication includes at least one of: relay forwarding interest, a desired relay access mode, a control plane forwarding instruction, a user plane forwarding instruction, an uplink forwarding instruction, a downlink forwarding instruction, and an EPS bearer identifier or a DRB identifier or a logical channel identifier which is desired to be forwarded through the relay, wherein each EPS bearer corresponds to an uplink data forwarding instruction, a downlink data forwarding instruction, and uplink and downlink data forwarding instructions.

Optionally, before the remote UE receives the relay related configuration information sent by the base station, the method further includes: and the base station receives the relay support indication information or the relay support update information sent by the relay r-UE, wherein the relay support update information is used for updating/modifying/reconfiguring any field in the relay support indication information.

Optionally, the relay support indication information includes at least one of: a relay UE identifier, a relay support indication, a supported relay access mode, WLAN information and Bluetooth information;

optionally, the WLAN information includes: WLAN terminal WT identification, WLAN identification, basic service set identification BSSID, WLAN operation type, WLAN country code, maximum capacity, WLAN bandwidth information, service set identification SSID, homogeneous extended service set hesssid.

Optionally, the configuring by the remote UE according to the relay related configuration information includes: the remote UE executes relay measurement or relay discovery or WLAN measurement and reports a measurement result to a base station; or (b)

The remote UE performs relay measurement or relay discovery or WLAN measurement, and selects relay UE or WLAN or BlueTooth according to the relay measurement result or relay selection threshold or relay selection hysteresis value or WLAN measurement result or WLAN selection threshold or WLAN selection hysteresis value or BlueTooth selection threshold or BlueTooth selection hysteresis value to access the relay UE through the sidelink/PC5 or WLAN or BT.

Optionally, after the remote UE reports the measurement result to the base station, the base station selects a relay UE for the remote UE, and informs the remote UE of the selected relay UE through RRC dedicated signaling. The notifying the remote UE of the selected relay UE through RRC-dedicated signaling includes: the ProSe layer2 of the relay UE identifies ProSe layer2ID, or the C-RNTI identification of the relay UE, or the WLAN MAC address of the relay UE.

Optionally, after the remote UE accesses and/or connects to the relay UE, the method includes: the remote UE or the relay UE sends a relay connection state report to the base station; the relay connection status report includes at least one of: the WLAN MAC address of the remote UE, the ProSe UE ID of the relay UE, the relay access mode, successful connection, connection failure and failure reasons;

optionally, the relay connection status report may be sent by at least one of: sidelinkUEInformation, WLAN connection status report, WLAN association confirm message, RRC dedicated signaling.

Optionally, before the remote UE forwards the data through the relay UE, the method includes: the relay UE receives relay forwarding request information sent by a base station; the relay UE transmits relay forwarding response information to the base station.

Optionally, the relay forwarding request information includes at least one of: the WLAN MAC address of the remote UE, the remote ProSe UE ID, the E-RAB identifier expected to be forwarded by the remote, qoS parameters and an eNB GTP tunnel terminal point.

Optionally, the relay forwarding response information includes at least one of: E-RAB identification list allowing to be forwarded through the relay, E-RAB identification list refusing to be forwarded through the relay.

Optionally, after the relay UE receives the relay forwarding request information sent by the base station, the relay UE performs admission control on an E-RAB expected to be forwarded through a relay in the relay forwarding request, and the relay UE determines whether there is an established forwarding Uu bearer meeting QoS requirements according to a bearer condition of the relay UE, and determines to allow admission of the established forwarding Uu bearer; if the received forwarding Uu bearer can be received, the relay UE initiates to establish a corresponding EPS bearer, or after receiving the relay forwarding response information sent by the relay UE, the base station sends configuration information for establishing the forwarding Uu bearer to the relay UE.

Optionally, the forwarding Uu bearer configuration information sent by the base station to the relay UE includes at least one of: uu DRB identification, pdcp configuration, rl configuration, logical channel identification, and logical channel configuration.

Optionally, before the remote UE forwards the data through the relay UE, the method includes: the remote UE receives relay forwarding indication information sent by a base station, wherein the relay forwarding indication information comprises at least one of the following components: control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer identification/DRB identification/logical channel identification by relay forwarding, uplink data forwarding indication, downlink data forwarding indication, uplink and downlink data forwarding indication corresponding to each EPS bearer.

The embodiment of the invention also provides a communication device of the equipment direct connection system, which is applied to the remote user equipment UE, and the device is used for implementing the method of the embodiment shown in fig. 4, as shown in fig. 5, and the device comprises:

an access module 50 for accessing and/or connecting to the relay UE;

and a forwarding module 52, configured to forward the data through the relay UE.

The embodiment of the invention also provides a communication method of the equipment through system relay, as shown in fig. 6, the method comprises the following steps:

step S602, a base station receives relay related configuration information, wherein the relay related configuration information is used for remote UE discovery, measurement, selection and access to relay UE; in step S604, the base station performs processing corresponding to the relay related configuration information according to the relay related configuration information.

Optionally, the base station receives relay related configuration information, including: the base station acquires the relay related configuration information from the MME through an S1 interface; or the base station acquires the relay related configuration information from the adjacent base station or the target base station through an X2 interface. Wherein the relay related configuration information includes at least one of: relay forwarding interest/request, relay forwarding bearer indication, remote UE identification, access mode, relay UE identification, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, uplink and downlink forwarding indication, UE PC5 aggregate maximum bit rate; the access mode comprises the following steps: D2D access, WLAN access, blueTooth access.

Optionally, the base station obtains the relay related configuration information from the MME through an S1 interface, including at least one of: the base station acquires the relay related configuration information from the MME through a bearer establishment request or a bearer modification request message of an S1 interface; the base station acquires the relay related configuration information from the MME through an initial context establishment request or a UE context modification request message of an S1 interface; the base station acquires the relay related configuration information from the MME through a switching request of an S1 interface and a path switching request confirmation message; the base station acquires the relay related configuration information from the MME through an MME configuration transmission message of an S1 interface.

Optionally, the base station acquires relay related configuration information from a neighboring/target base station through an X2 interface, including at least one of the following: the base station acquires the relay related configuration information from the adjacent base station or the target base station through the switching request message of the X2 interface; the base station acquires relay related configuration information from a neighboring base station or a target base station through an X2 establishment request or an X2 establishment response message of an X2 interface; the base station acquires relay related configuration information from a neighboring base station or a target base station through a base station configuration transmission message of an X2 interface.

Optionally, before the base station obtains the relay related configuration information from the MME through the S1 interface, the method includes: the MME receives relay related configuration information sent by a remote UE or a relay UE.

Optionally, the method further comprises: the remote UE or relay UE transmits the relay related configuration information through at least one message of: attach request, service request, bearer resource allocation request, bearer resource modification request.

Optionally, the base station performs processing corresponding to the relay related configuration information according to the relay related configuration information, including: if the base station receives relay forwarding interest or relay forwarding request, the base station selects or configures relay UE for remote UE; or, the base station sends a relay forwarding bearer establishment request to the relay UE, and the base station receives a relay forwarding bearer establishment response sent by the relay UE; if the base station receives the relay forwarding bearer indication, the base station distinguishes the Uu bearer of the relay UE and the Uu bearer of the relay UE to which the data is transferred according to the relay forwarding bearer indication so as to correctly map the downlink remote UE data to the corresponding Uu bearer; if the base station receives at least one of the following relay related configuration information: the base station stores the received relay related configuration information, and carries out measurement configuration, resource configuration and/or bearing configuration on the remote UE and/or the relay UE according to different access modes; and if the base station receives the UE PC5 aggregate maximum bit rate, the base station performs PC5 resource configuration for the remote UE or the relay UE according to the UE-PC 5-AMBR.

After the base station receives the UE-PC5-AMBR, the base station sends the UE-PC5-AMBR to a remote UE or a relay UE through RRC dedicated signaling; and the remote UE or the relay UE autonomously selects resources to perform PC5 communication according to the UE-PC 5-AMBR.

Optionally, the relay forwarding bearer establishment request includes at least one of: the WLAN MAC address of the remote UE, the ProSe UE ID of the remote UE, the E-RAB identifier expected to be forwarded by the remote UE through relay, qoS parameters and an eNB GTP tunnel terminal; and/or

The relay forwarding bearer establishment response information includes at least one of: E-RAB identification list allowing to be forwarded through the relay, rejecting the E-RAB identification list forwarded through the relay;

optionally, after the base station sends the relay forwarding bearer establishment request information to the relay UE, the method includes: the relay UE carries out admission control on E-RAB expected to pass through relay forwarding in a relay forwarding bearer establishment request, and determines whether a forwarding Uu bearer meeting QoS requirements is established or not and determines whether the established forwarding Uu bearer is allowed to be admitted according to the bearer condition of the relay UE; if the forwarding Uu bearer allowed to be received and established exists, the relay UE initiates to establish a corresponding EPS bearer, or after the base station receives the relay forwarding bearer establishment response information sent by the relay UE, the base station sends configuration information for establishing the forwarding Uu bearer to the relay UE.

Optionally, the establishing forwarding Uu bearer configuration information sent by the base station to the relay UE includes at least one of: uu DRB identification, PDCP configuration, RLC configuration, logical channel identification, logical channel configuration.

The embodiment of the invention also provides a communication method of the equipment through system relay, as shown in fig. 7, the method comprises the following steps:

step S702, a base station acquires PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring a device-to-device (D2D) communication function supported by UE; alternatively, this step may be obtained from other entities, such as the MME, or from a local store.

In step S704, the base station transmits PC5 interface configuration information to the user equipment UE.

Optionally, the UE includes: remote UE and/or relay UE; the base station sending the PC5 interface configuration information to the UE includes: the base station sends PC5 bearing configuration information to the remote UE; and/or the base station sends PC5 bearing configuration information to the relay UE; and/or the base station sends relay forwarding indication information to the remote UE or the relay UE; and/or the remote UE receives mapping information between a PC5 logical channel group and Uu logical channel priority sent by a base station or mapping information between a PC5 data packet priority and Uu bearer QCI; and/or the relay UE receives mapping information between the PC5 logical channel group and Uu logical channel priority of the remote UE sent by the base station.

Optionally, the UE includes: remote UE and relay UE; the base station receives a remote UE identifier sent by the relay UE; and the base station determines whether to allow the relay UE to accept and establish the PC5 bearer according to the resource scheduling or allocation condition.

Optionally, after the base station sends relay forwarding instruction information to the relay UE, the base station receives relay response information sent by the relay UE, where the relay response information is information sent by the relay UE after judging whether to establish the forwarding Uu bearer.

Optionally, the response information includes: relay forwarding acceptance information or relay forwarding rejection information, wherein the relay forwarding acceptance information includes: the EPS list of the remote UE that is allowed to be forwarded through the relay and the EPS list that is rejected to be forwarded through the relay.

Optionally, after receiving the relay response information sent by the relay UE, the base station sends setup configuration information for forwarding Uu bearers to the relay UE; the establishment configuration information of the forwarding Uu bearer includes at least one of: uu DRB identification, packet data convergence protocol PDCP configuration, RLC configuration, logical channel identification and logical channel configuration.

Optionally, before the base station sends the relay forwarding indication information to the remote UE, the base station receives relay forwarding interest indication information sent by the remote UE through RRC dedicated signaling, where the relay forwarding interest indication information includes at least one of: relay forwarding interest, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer list expected to be forwarded by relay.

The embodiment of the invention also provides a communication system, which comprises: the system comprises User Equipment (UE) and a base station, wherein the UE is used for receiving PC5 interface configuration information sent by the base station and configuring according to the PC5 interface configuration information, and the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function.

The embodiment of the invention also provides a communication system, which comprises: the remote User Equipment (UE) and the relay UE, wherein the remote UE is used for accessing and/or connecting to the relay UE and forwarding data through the relay UE.

For a better understanding of the above embodiments, the following detailed description is provided in connection with the embodiments.

The technical problem to be solved by the following embodiments is how to support bearer configuration and management issues for relay UEs to forward remote UE (including but not limited to wearable/eMTC/NB-IoT devices (w-UEs)) data. By the method provided by the following embodiment, the remote UE establishes communication connection with the relay UE, and performs negotiation configuration and Uu bearer configuration of PC5 bearers for forwarding the data of the remote UE by the relay UE, thereby ensuring that the remote UE smoothly communicates with the network through the relay UE. In the following examples, wearable UE (w-UE) is taken as an example, and r-UE or relay UE is used as a relay UE in the following examples.

Example 1

The present example provides a forwarding bearer configuration and a related flow established in a scenario where data of a wearable/eMTC/NB-IoT UE is forwarded through a relay UE, as shown in fig. 8. In the example, the w-UE is under normal coverage or extended coverage, can directly perform signaling interaction with the eNB, considers the problems of cost, electricity saving and the like, searches for relay r-UE, and achieves the purpose of reducing power consumption by forwarding data through the r-UE, wherein the relay r-UE is in a connected state, and the w-UE and the r-UE are under the coverage of the same base station.

Step 0: and (5) discovering and selecting a relay. R13 ProSe UE-to-network relay discovery procedure, support two relay discovery modes, relay broadcast discovery message, w-UE monitor, or w-UE send discovery solicitation message, relay response. And the w-UE autonomously selects a relay according to the link quality, the signal strength and the like between the w-UE and the r-UE, and reports the selected relay to the eNB.

Step 1: when the w-UE has data transmission or the network has data to the w-UE, the w-UE or the PGW initiates EPS bearer establishment of the w-UE. The EPS bearer establishment procedure of the w-UE is a conventional LTE procedure, which is well known in the industry and will not be described here again.

Step 2: when the w-UE or the PGW initiates EPS bearing establishment of the w-UE, the eNB configures a corresponding Uu port DRB for the w-UE, and the eNB can simultaneously configure a corresponding PC5 bearing for the EPS bearing. The PC5 bearer setup configuration information includes any combination of: PC5 carries the identification, the pdcp configuration, the rl configuration, the logic channel identification, the logic channel configuration, and PC5 carries QoS information; wherein the rl configuration comprises any combination of the following: a poll retransmission timer (t-poll retransmission), a poll protocol data unit (poll pdu), a poll byte count (poll), a maximum retransmission threshold (maxRetxThreshold), a reorder timer (t-reorder), a status prohibit timer (t-status inhibit), a unacknowledged mode sequence number field length (sn-FieldLength); the logical channel configuration includes: a logical channel group LCG, which preferentially guarantees the bit rate PBR and the bucket size duration BSD; the PC5 carries QoS information including any combination of: quality of service class QCI, guaranteed bit rate GBR, maximum bit rate MBR, UE aggregate maximum bit rate (UE-AMBR). The PC5 bearer identifier, the logical channel identifier and the logical channel group in the PC5 bearer establishment configuration information can multiplex Uu DRB identifiers, logical channel identifiers and logical channel groups of corresponding EPS bearers, and if not multiplex, the PC5 bearer establishment configuration information contains EPS bearer identifiers and Uu DRB identifiers of corresponding EPS bearers. And the PC5 bearing configuration information is sent to the w-UE through an RRC reconfiguration message. Optionally, the PC5 bearer configuration information includes indication information for initiating establishment of the PC5 bearer to the relay UE. And after the PC5 bearer establishment is completed (i.e., after step 4 is completed), the w-UE sends an RRC reconfiguration complete message to the eNB to indicate that the PC5 bearer establishment is completed.

Step 3: the w-UE is connected with the selected r-UE in a safe layer 2 mode, and sends a direct communication request carrying a ProSe UE ID to the r-UE, and the r-UE responds. The direct communication request and response messages may be multiplexed with the PC5Signalling Protocol messages (NAS messages) of R13, or by PC5AS signaling messages, meaning that the PC5 control plane protocol stack adds an RRC-like protocol layer.

Step 4: PC5 bearer configuration interactions and bearer establishment. The w-UE sends a PC5 bearer establishment message to the r-UE, carrying the PC5 bearer establishment configuration information received from the eNB and corresponding PC5 bearer QoS information, and the r-UE sends a response message and completes the PC5 bearer configuration. Similar to the connection establishment related message in step 3, the PC5 bearer establishment and response message may also be a PC5NAS signaling message or a PC5AS signaling message.

Step 5: after receiving the PC5 bearer establishment message of the w-UE, the r-UE can carry out admission control on the w-UE. The r-UE determines whether to accept to establish a new PC5 bearer according to the received PC5 bearer QoS information in the PC5 bearer establishment configuration information sent by the w-UE, the quantity of the PC5 bearers established by the r-UE and the resource load condition; or the r-UE transmits the PC5 bearer QoS information to the base station, and the base station determines whether to allow the r-UE to accept and establish the PC5 bearer according to the resource scheduling/allocation condition. The r-UE sends a PC5 bearer establishment response message to the w-UE after admission establishment of the PC5 bearer is allowed.

Step 6: after receiving the PC5 bearer establishment message of the w-UE and admitting and establishing the PC5 bearer, the r-UE judges whether an EPS bearer special for forwarding the w-UE data needs to be established or not, and determines whether an EPS bearer special for forwarding the w-UE data meets the requirement or not according to the PC5 bearer QoS information in the received PC5 bearer establishment configuration information sent by the w-UE and EPS bearer list information maintained by the r-UE, if not, the r-UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to the network, and establishes or modifies the EPS bearer special for forwarding the w-UE data, wherein the EPS bearer establishment flow is a traditional LTE flow and is not repeated herein.

Step 7: after the r-UE establishes the EPS bearer dedicated to forwarding w-UE data, the EPS bearer is indicated to the eNB by an RRC message (RRC dedicated signaling or RRC reconfiguration complete message or sidelinkueuinformation) to be dedicated to forwarding w-UE data (carrying EPS bearer identifier/DRB identifier/logical channel identifier), so that when the r-UE has two EPS bearers (one for transmitting r-UE own data and one for forwarding w-UE data) with the same QCI value, the eNB can distinguish which EPS bearer/DRB is used to forward w-UE data, so that the data is correctly mapped to the corresponding bearer for transmission.

Step 8: the specific method is that in the embodiment 5, after the PC5 bearer corresponding to the EPS bearer of the w-UE is established and the Uu bearer of the w-UE data is forwarded by the r-UE, the w-UE can negotiate with the eNB about which EPS bearer data is forwarded by the r-UE, and then the data of the EPS bearer of the w-UE with the agreement is forwarded by the r-UE.

Example 2

The present example provides a specific example of forwarding bearer configuration and related flow establishment in another scenario where data of a wearable/eMTC/NB-IoT device (w-UE) is forwarded through relay r-UE, as shown in fig. 9. This example is substantially similar to example 1, except that the order of the individual steps is adjusted.

Step 0: the w-UE has data transmission or initiates EPS bearing establishment according to service requirements. For the conventional LTE procedure, a description thereof is omitted.

Step 1: and the w-UE performs relay discovery and selection, and R13ProSe UE-to-Network relay discovery flow. And after selecting the relay UE, performing a secure layer 2 connection with the selected relay UE, specifically, the same as step 3 in example 1.

Step 2: in the specific method, in the example 5, different from the example 1, after setting up PC5 bearing corresponding to the EPS bearing of the w-UE, the w-UE negotiates with the eNB which EPS bearing data is forwarded by the relay, in the example, after negotiating with the eNB the EPS bearing forwarded by the relay, corresponding PC5 bearing setting up and Uu bearing setting up special for forwarding the w-UE data by the r-UE are carried out.

Step 3: after the w-UE and the eNB negotiate which EPS bearing data are forwarded through the relay, the eNB configures PC5 bearing corresponding to the EPS bearing for the w-UE, and the eNB sends the PC5 bearing configuration information to the w-UE through an RRC reconfiguration message. Specifically, the PC5 carries configuration information as described in step 2 in example 1. And after the PC5 bearer establishment is completed (i.e., after step 4 is completed), the w-UE sends an RRC reconfiguration complete message to the eNB to indicate that the PC5 bearer establishment is completed.

Step 4-5: PC5 bearer configuration interaction and bearer establishment between w-UE and r-UE, and r-UE performs admission control on w-UE. Specifically, the same procedure as in step 4-5 of example 1 was followed.

Step 6: after receiving the PC5 bearer establishment message of the w-UE and admitting and establishing the PC5 bearer, the r-UE determines whether an EPS bearer dedicated for forwarding w-UE data needs to be established, and determines whether an EPS bearer dedicated for forwarding w-UE data is required according to the received PC5 bearer QoS information in the PC5 bearer establishment configuration information sent by the w-UE and EPS bearer list information maintained by the r-UE, if not, the r-UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to the network, establishes or modifies the EPS bearer dedicated for forwarding w-UE data, and at the same time, the request messages from the w-UE to the MME can carry a forwarding bearer indication, and then the forwarding bearer indication is carried in a bearer establishment related message (Bearer setup request/Session management request/Bearer modify request) sent by the MME to the eNB.

After negotiating which EPS bearers of the w-UE are forwarded through the relay and establishing corresponding PC5 bearers and forwarding Uu bearers, the agreed EPS bearers of the w-UE are forwarded through the relay r-UE.

Example 3

The present example provides another specific example of a related procedure of PC5 bearer establishment configuration and Uu forwarding bearer establishment when data of a wearable/eMTC/NB-IoT device (w-UE) reaches an eNB through a relay r-UE forwarding scenario, as shown in fig. 10.

Step 1: the higher layer of the w-UE decides to select a communication mode forwarded through the relay according to the requirements of QoS, power saving and the like, and the w-UE indicates the PC5 communication interest to the eNB when the RRC connection is established (the PC5 transmission interest indication is carried in the RRC connection establishment request message).

Step 2: and the w-UE performs relay discovery and selection, and R13ProSe UE-to-network relay discovery flow. After the W-UE selects the relay, the selected relay information is informed to the eNB, namely, the ProSe UE ID of the relay is carried by the sidelink information message. The w-UE establishes a secure layer 2 connection with the relay UE, specifically as in step 3 of example 1.

Step 3-4: when the network has data sent to the w-UE, the PGW initiates the EPS bearing establishment of the w-UE, and after the bearing establishment is completed, the w-UE data is transmitted to the eNB through the bearing, and the LTE flow is traditional.

Step 5: the w-UE has informed the eNB that its PC5 is transmitting an indication of interest and the eNB has stored the relay UE information selected by the w-UE, the eNB needs to forward the w-UE data to the w-UE via the relay. If the eNB finds that the relay UE does not meet the Uu DRB special for forwarding the w-UE data required by QoS, the w-UE and the r-UE do not establish corresponding PC5 bearing, and the eNB carries out PC5 bearing configuration and Uu bearing configuration for forwarding the w-UE data for the w-UE and the r-UE.

Step 6: establishment of w-UE PC5 bearer. The eNB sends the PC5 bearer establishment configuration to the w-UE. Optionally, the PC5 bearer establishment configuration information includes a simultaneous configuration indication, informing the w-UE/r-UE that the eNB has configured the PC5 bearer for the other party, without initiating a PC5 bearer interaction. After the establishment of the PC5 bearer is completed, the w-UE sends an RRC reconfiguration message to the eNB to indicate the completion of the establishment of the PC5 bearer.

Step 7: and r-UE PC5 bearer establishment and Uu DRB establishment for forwarding w-UE data. The eNB sends a PC5 bearer establishment configuration and a Uu DRB configuration for forwarding w-UE data to the w-UE, wherein the Uu DRB configuration comprises: uu DRB identification, pdcp configuration, rl configuration, logical channel identification, and logical channel configuration. The difference from the above example where r-UE initiates establishment of EPS bearer for forwarding w-UE data is that in the above example, uu DRB is obtained by establishing EPS bearer for forwarding w-UE data, but in this example, uu DRB for forwarding w-UE data only has a segment of DRB with an air interface and no corresponding EPS bearer. After the PC5 bearer establishment is completed and the Uu DRB establishment is forwarded, the r-UE sends an RRC reconfiguration message to the eNB to indicate the completion of the PC5 bearer establishment and the Uu DRB establishment.

The eNB sends the data of the w-UE to the relay UE through the DRB which is newly established by the relay UE and is special for forwarding the data of the w-UE, and the relay UE receives the data of the w-UE and then sends the data to the w-UE through PC5 bearing. The PC5 bearer and Uu bearer of the Relay UE for forwarding the w-UE data are established, and the subsequent uplink/downlink data of the w-UE with the same QoS requirement can be forwarded by the Relay UE.

Fig. 11 is similar to fig. 10, except that PC5 bearer establishment is initiated by a relay UE to a w-UE, which establishes Uu bearers dedicated to forwarding w-UE data by initiating a legacy EPS bearer establishment procedure (as in example 1). When the downlink data of the w-UE arrives at the eNB, the eNB sends PC5 bearer establishment configuration information to the relay UE, the relay UE initiates PC5 bearer establishment to the w-UE, carries the PC5 bearer establishment configuration information, the w-UE establishes PC5 bearers according to the configuration after receiving the PC5 bearer establishment configuration information, and sends PC5 bearer establishment response information to the relay UE, and the relay UE sends a message to the eNB after finishing the PC5 bearer establishment to inform the completion of the PC5 bearer establishment. When the downlink data of the w-UE arrives at the eNB, the eNB checks whether the relay UE has an EPS bearing which meets the QoS requirement and is used for forwarding the w-UE data, if not, the eNB instructs the relay UE to initiate the establishment of the EPS bearing which is used for forwarding the w-UE data, and after the establishment of the EPS bearing is completed, the relay UE instructs the EPS bearing to the eNB for forwarding the w-UE data.

Example 4

The present example provides another scenario in which data of a wearable/eMTC/NB-IoT device (w-UE) is forwarded by relay r-UE, where the w-UE has no direct signaling interaction with eNB, and both w-UE control plane signaling and user plane data are forwarded by relay UE, as shown in fig. 12. The Relay UE is in a connected state and has activated a Relay related configuration.

Step 0: and (5) discovering and selecting a relay. As in the previous examples.

Step 1: after completion of relay discovery and selection, the w-UE establishes a secure layer 2 connection/communication connection with the selected relay UE. In this example, the relay connection establishment related message is performed through PC5 AS signaling. After receiving the direct communication request of the w-UE, the Relay UE sends a desirability UE information carrying a remote UE ID to the eNB, informs the eNB that the w-UE is connected to the eNB, and performs Relay communication. The eNB stores w-UE information. Optionally, the relay UE obtains subscription information, authorization and other information of the remote UE from the ProSe function, and sends the subscription information, authorization and other information carried in the sidelink information to the eNB.

Step 2-5: the w-UE generates RRC connection setup request information itself. And completing the RRC connection establishment process through relay forwarding control plane signaling. The w-UE sends the generated RRC connection request information to the relay UE through a control plane message, and the relay UE forwards the RRC connection request information of the w-UE to the eNB after receiving the RRC connection request information; the eNB performs access control on the w-UE, after the w-UE is allowed to be accessed, RRC connection establishment information of the w-UE is sent to relay UE, and the relay UE forwards the information to the w-UE; after the establishment of the RRC connection is completed, the w-UE sends an RRC connection completion message carrying an Attach message to the relay UE, the relay UE forwards the Attach message to the eNB, and the eNB forwards the Attach message to the core network and completes the attachment process of the w-UE through the relay.

Step 6: the EPS bearer of the w-UE is established. And the eNB sends EPS bearing configuration information of the w-UE to the relay UE, and the relay UE forwards the EPS bearing configuration information to the w-UE. After the configuration of EPS bearing/Uu DRB is completed, the w-UE sends RRC reconfiguration completion information to the eNB, and the RRC reconfiguration completion information is forwarded by the relay UE.

Step 7-8: the eNB sends PC5 bearer establishment configuration information corresponding to the EPS bearer of the w-UE to the relay UE, and the relay UE initiates PC5 bearer establishment to the w-UE. And informs the eNB after the PC5 bearer establishment is completed.

As in the above example, the relay UE detects whether there is Uu bearer for forwarding w-UE data meeting QoS requirements, and if not, initiates establishment of EPS bearer dedicated for forwarding w-UE data and indicates to the eNB. The uplink and downlink data of the w-UE with the same QoS requirements are then forwarded through the relay.

Example 5

The present example provides a method for the w-UE mentioned in the above example to negotiate with the eNB for EPS bearers forwarded through the relay.

The method comprises the following steps: the w-UE selects whether to forward the communication mode through relay by a higher layer according to QoS, power saving requirement, etc., and after the selection, the UE may inform the eNB of the tendency of data communication when the Attach, service request, RRC connection is established. This method is embodied in example 3.

The second method is as follows: the w-UE sends a relay forwarding instruction to the eNB, specifically, the relay forwarding interest instruction or the relay UE ID can be contained, and then the data of all EPS bearers of the w-UE are forwarded through the relay; or the EPS bearing identifier/logic channel identifier/Uu DRB identifier which needs to be forwarded by relay is included, and further, the uplink forwarding indication, the downlink forwarding indication, the uplink forwarding indication and the downlink forwarding indication corresponding to the per bearer can be also included. The w-UE may send the relay forwarding indication information to the eNB through RRC dedicated signaling or RRC reconfiguration complete message or sidelink information message.

And a third method: the eNB sends a relay forwarding instruction to the w-UE through RRC dedicated signaling, such as an RRC reconfiguration message, and specifically may include a relay UE ID and a relay related configuration, and EPS bearer related information of the w-UE that forwards by the relay, such as EPS bearer identifier/logical channel identifier/Uu DRB identifier, further, an uplink forwarding instruction, a downlink forwarding instruction, and uplink and downlink forwarding instructions corresponding to each bearer.

The method four: the w-UE indicates forwarding through relay to the MME when the EPS bearing is established or modified, and the MME indicates forwarding of the EPS bearing data through relay to the eNB. Specifically, when a w-UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to a network and sets up or modifies an EPS bearer, a relay forwarding instruction is carried in these request messages, and then the MME carries the relay forwarding instruction in a bearer setup related message (Bearer setup request/Session management request/Bearer modify request) sent to the eNB.

Example 6

The PC5 bearer between the w-UE and the relay UE supports the modification and release of the PC5 bearer, and can be initiated by the w-UE or the relay UE. When the EPS bearing corresponding to the PC5 bearing of the w-UE is modified and released, the modification and release of the PC5 bearing are initiated. Or when the data of some EPS bearing does not need to be forwarded through a relay, releasing the PC5 bearing corresponding to the EPS bearing. Or when the PC5 resources are not enough, the high priority PC5 bearer preempts the low priority PC5 bearer resources, and the low priority PC5 bearer is released.

As shown in fig. 13, when the EPS bearer corresponding to the PC5 bearer of the w-UE is modified, the eNB simultaneously sends the PC5 bearer modification configuration corresponding to the EPS bearer to the w-UE, and after the w-UE receives the PC5 bearer modification configuration of the eNB, sends a PC5 bearer modification message to the relay UE, performs PC5 bearer modification, and the relay UE sends a PC5 bearer modification response message to the w-UE. After finishing the PC5 bearer modification, the w-UE sends an RRC reconfiguration message to the eNB to inform the PC5 that the bearer modification is finished.

As shown in fig. 14, a PC5 bearer release procedure of a w-UE is provided, where an eNB instructs the w-UE to release a PC5 bearer, including a bearer identifier/logical channel identifier of the PC5 bearer to be released, and optionally, a release reason; after receiving the PC5 bearer release instruction, the w-UE sends a PC5 bearer release message to the relay UE, carrying the PC5 bearer identifier/logic channel identifier to be released. After the release of the PC5 bearer is completed, the w-UE informs the eNB of the completion of the release of the PC5 bearer through an RRC reconfiguration message.

Example 7

In the above example, before the w-UE forwards data through the r-UE (the w-UE performs PC5 communication with the r-UE), a PC5 logical connection needs to be established/maintained (PC 5 bearer establishment), and this example provides a method without maintaining the PC5 logical connection (the UE implements the PC5 bearer), and the specific flow is shown in fig. 15.

Step 1-2: the relay discovers and selects, and establishes a PC5 secure layer 2 connection. The W-UE has data transmission and establishes EPS bearing.

Step 3: and performing admission control on the EPS bearer of the forwarded w-UE, and if the Uu bearer of the forwarded w-UE data meeting the QoS requirement is not available, initiating establishment of the Uu bearer of the forwarded w-UE data.

Step 4: the base station sends an RRC reconfiguration message to the w-UE, which may carry any combination of: the mapping relation between the Uu logic channel priority of the w-UE and the LCG of the PC5 can be configured through the EPS bearing identifier/DRB identifier/logic channel identifier list forwarded by the relay, and the mapping relation between the QCI of the EPS bearing/DRB of the w-UE and PPPP (ProSe Per Packet Priority);

step 5: the w-UE transfers the Uu data to the PC5 interface for transmission, and the Uu data can be mapped to the PC5 interface for transmission according to the mapping relation between the priority of the Uu logic channel configured by the base station and the LCG of the PC5, or the mapping relation between the Uu QCI configured by the base station and the PPPP, or the mapping relation between the Uu QCI and the PPPP pre-configured by the w-UE;

step 6: when the w-UE transmits data, the w-UE realizes the PDCP entity/RLC entity/logic channel/MAC entity to transmit data, wherein the RLC entity is an RLC UM entity or an RLC AM entity, and the parameters of the RLC AM entity comprise any combination of the following: RLC AM mode sequence number, poll retransmission timer (t-poll retransmission), poll protocol data unit (poll pdu), poll byte count (poll byte), maximum retransmission threshold (maxRetxThreshold), reorder timer (t-reorder), status prohibit timer (t-status inhibit); after receiving the first MAC PDU, the receiving end r-UE establishes the receiving end PDCP entity/RLC entity/logic channel/MAC entity to receive data.

Example 8

The embodiment provides a method for accessing r-UE through WLAN by w-UE and forwarding data through r-UE, and the specific flow is shown in figure 16. The w-UE and the relay r-UE are covered by the eNB.

Step 1: due to the requirements of power saving, qoS and the like, the w-UE has the interest of forwarding through the relay, and the w-UE indicates the interest of forwarding the relay and the reporting of the capability of the w-UE to the eNB through RRC special signaling (such as a supported relay access mode: D2D, WLAN, blueTooth);

step 2: and the relay UE with the relay capability or meeting a relay starting threshold sends relay support indication information to the eNB through the special signaling. The relay support indication information includes any combination of: a relay UE identifier, a relay support indication, a supported relay access mode, WLAN information and Bluetooth information; the relay access mode comprises the following steps: D2D access, WLAN access, blueTooth access; the WLAN information includes: WT (WLAN Termination) identifier, WLAN identifier, basic service set identifier BSSID, WLAN operation type, WLAN country code, maximum capacity, WLAN bandwidth information, service set identifier SSID, homogeneous extended service set hesssid. When any field in the relay support indication information changes, the relay transmits relay support update information to the eNB for updating/modifying/reconfiguring any field in the relay support indication information.

Step 3: the eNB sends relay related configuration information to the w-UE. The relay-related configuration information includes any combination of: relay measurement threshold, relay discovery threshold, relay selection hysteresis value, relay discovery transmission/reception resource, WLAN measurement threshold, WLAN measurement configuration information, WLAN selection threshold, WLAN selection hysteresis value, blueTooth selection threshold, blueTooth selection hysteresis value; the base station transmits relay related configuration information through RRC dedicated signaling or broadcast message;

step 4: the w-UE performs WLAN measurement according to the WLAN measurement configuration sent by the eNB, and reports the measurement result to the eNB;

step 5: the eNB selects a relay UE (WLAN) for the w-UE according to the measurement information reported by the w-UE;

step 6: the eNB sends relay forwarding request information to relay UE, wherein the relay forwarding request information comprises: WLAN MAC address of w-UE, proSe UE ID of w-UE, E-RAB identification expected to be forwarded by the w-UE through relay, qoS parameter, eNB GTP tunnel terminal; the base station may transmit relay forwarding request information through an RRC reconfiguration message. After receiving relay forwarding request information sent by a base station, the relay r-UE performs admission control on E-RAB expected to be forwarded through the relay in the relay forwarding request, and the r-UE checks whether Uu DRB special for forwarding w-UE data meeting QoS requirements is established or not according to self bearing conditions, and determines Uu bearing special for forwarding w-UE data which can be admitted. Then, the relay UE transmits relay forwarding response information to the base station, the relay forwarding response information including: an E-RAB identification list which is received and can be forwarded through a relay, and an E-RAB identification list which is refused and forwarded through the relay; and the relay forwarding response information is sent to the base station through RRC reconfiguration completion or the desiring UEInformation message.

Step 7: if the established Uu bearer dedicated for forwarding w-UE data can be admitted, the r-UE initiates to establish a corresponding EPS bearer (traditional flow), or after receiving relay forwarding response information sent by the relay r-UE, the base station sends configuration information for establishing the Uu bearer dedicated for forwarding w-UE data to the r-UE.

Step 8: the base station sends the selected relay UE and the forwarded EPS bearing information to the w-UE through the RRC reconfiguration message;

step 9: the w-UE executes WLAN association to the relay r-UE and sends a WLAN connection status report to the base station;

step 10: the w-UE forwards data to the network through the relay r-UE, and receives the data from the network forwarded by the relay r-UE.

Example 9

The present example provides another method for accessing r-UE through WLAN and forwarding data through r-UE, and the specific flow is shown in fig. 17. The difference from the previous example is that the relay UE is selected autonomously by the w-UE in this example.

Step 1-3: as in steps 1-3 of example 8;

step 4: the w-UE that reaches the WLAN measurement threshold acquires WLAN related information (WLAN content, non-3 GPP content), selects WLAN (relay UE) according to the acquired WLAN information and the WLAN selection threshold, WLAN selection hysteresis value, and then performs WLAN association to the relay UE.

Step 5: if the w-UE successfully accesses the relay (related to WLAN), the relay UE sends a relay connection status report to the eNB, wherein the relay connection status report comprises accessed w-UE identification (such as WLAN MAC address, proSe UE ID of the w-UE);

step 6: the relay r-UE carries out admission control on the EPS bearing of the forwarded w-UE, and the admission control is the same as that of the step 6-7 in the example 8;

step 7: the w-UE forwards the data to the network through the relay r-UE or receives the data from the network forwarded by the relay r-UE.

Step 8-9: if the w-UE moves to other WLAN APs of the WLAN mobility set, the relay UE reports WLAN connection status information or updates relay support indication information (updates the connected/associated w-UE list) to the base station.

Example 10

The embodiment provides a method for a base station to acquire information related to w-UE or r-UE relay from MME through S1 interface, and the specific flow is shown in fig. 18.

Step 1: the w-UE selects a communication mode forwarded by a relay according to requirements of electricity saving, qoS and the like, and after the communication mode is selected, the w-UE carries relay forwarding interest/request information in an Attach request or a service request or a bearer resource allocation/modification request message sent to the MME;

step 2: after receiving the relay forwarding interest/request of the w-UE, the MME carries the relay forwarding interest/request in an initial context establishment request or a bearer modification request message of the UE sent to the eNB so as to inform the communication tendency of the w-UE of the eNB; if the w-UE is the UE supporting the D2D/PC5 communication, the aggregate maximum bit rate of the UE PC5 can be carried;

After receiving the relay forwarding interest/request of the w-UE sent by the MME, if the base station stores the information of the relay r-UE of the w-UE (the w-UE and the relay r-UE have completed relay discovery and PC5 safety connection), directly entering the step 3; if the base station does not have the relay r-UE information of the w-UE, the base station selects/configures r-UE for the w-UE and tells the w-UE of the selected relay r-UE;

step 3: the eNB sends relay forwarding bearer establishment request information to the relay r-UE through the RRC reconfiguration message, wherein the relay forwarding bearer establishment request information comprises any combination of the following components: WLAN MAC address of w-UE, proSe UE ID of w-UE, E-RAB identification expected to be forwarded by the w-UE through relay, qoS parameter, eNB GTP tunnel terminal; after receiving the message, the relay r-UE carries out admission control on E-RAB expected to be forwarded through the relay in a relay forwarding bearer establishment request, and the r-UE checks whether a Uu DRB special for forwarding w-UE data which meets QoS requirements is established or not according to the self bearer condition and determines that the established Uu bearer special for forwarding w-UE data can be admitted; then, the relay r-UE sends relay forwarding bearing establishment response information to the eNB through RRC reconfiguration completion or a desiring UEInformation message, wherein the relay forwarding bearing establishment response information comprises an E-RAB list and a rejected E-RAB list which can be accepted through the relay forwarding w-UE; if the Uu bearer which is built and is specially used for forwarding the w-UE data can be accepted, the r-UE initiates to build a corresponding EPS bearer, or after receiving relay forwarding bearer building response information sent by the relay r-UE, the base station sends configuration information for building the Uu bearer which is specially used for forwarding the w-UE data to the r-UE; the establishing Uu bearer configuration information which is sent to r-UE by the base station and is specially used for forwarding w-UE data comprises the following steps: uu DRB identification, pdcp configuration, rl configuration, logical channel identification, and logical channel configuration.

Step 4-5: the r-UE initiates establishment of EPS bearers dedicated to wearable UE data. In order to enable the MME/eNB to distinguish EPS bearing/Uu DRB used for sending own data of r-UE from EPS bearing/Uu DRB used for forwarding w-UE data, the r-UE carries a relay forwarding bearing indication in a bearing resource allocation/modification request sent to the MME and is used for indicating that the EPS bearing/corresponding Uu DRB is special for forwarding w-UE data; the MME also carries the indication in the bearer establishment/modification request sent to the eNB to inform the eNB so that when the r-UE has two EPS bearers (one for sending the r-UE's own data and one for forwarding the w-UE data) with the same QCI value, the eNB can distinguish which EPS bearer/DRB is used for forwarding the w-UE data, thereby correctly mapping the data to the corresponding bearer for sending.

Step 6: after receiving the relay forwarding bearer establishment response information sent by the r-UE and or the EPS bearer/Uu DRB for the r-UE to complete establishment and forwarding of w-UE data, the eNB sends any information to the w-UE through RRC reconfiguration information: the selected relay r-UE identifier (if the eNB selects r-UE), the EPS bearing identifier/Uu DRB identifier/logic channel identifier forwarded by the relay, the PC5 bearing configuration (if the eNB performs PC5 bearing configuration), the mapping relation of QCI and PPPP, the mapping relation of Uu DRB logic channel priority and PC5LCG, and the like.

The w-UE establishes PC5 bearer according to the configuration information or executes WLAN association to access the relay UE through WLAN or to access the relay UE through Bluetooth. The data of the EPS bearing forwarded by the w-UE through the relay is forwarded by the relay r-UE.

Example 11

The present example provides a method for a base station to obtain information related to w-UE or r-UE relay from a neighboring/target base station through an X2 interface, and the specific flow is shown in fig. 19. The w-UE and the r-UE are under eNB1, and the w-UE has access to the r-UE, and forwards data with the network directly through the r-UE.

Step 1: the w-UE moves to the edge of a cell and triggers measurement report, and the source service eNB1 receives the measurement report and then performs switching judgment to switch to the eNB2;

step 2: the source eNB1 of the w-UE sends switching request information to the target eNB2, wherein the switching request information carries relay related information of the w-UE, such as relay forwarding interest, an access mode, a (connected) relay r-UE identifier, uplink/downlink forwarding indication and PC5 aggregate maximum bit rate (UE-PC 5-AMBR) of the w-UE; thus, if the relay r-UE is also moved and switched to the eNB2, the w-UE and the r-UE still maintain connection/association, and the eNB2 can quickly know the r-UE and relay forwarding condition of the connection of the w-UE; even if the r-UE does not move under the eNB2, the eNB2 can configure measurement or perform appropriate resource scheduling/allocation for the w-UE according to information such as relay forwarding interest, access mode, UE-PC5-AMBR, and the like.

Step 3: the eNB2 carries out admission control and resource reservation on the w-UE which requests switching, and after passing, sends a switching request acknowledgement to the eNB1, and the eNB1 sends a switching command to the w-UE on an air interface; then, the w-UE performs air interface switching to the eNB2;

step 4: after the w-UE completes the air interface switching to the eNB2, the eNB2 sends a path switching request to the MME, and after the MME and the serving gateway complete the path switching process of switching the user plane data path from the source base station to the base station, sends a path switching request acknowledgement message to the target base station, wherein the path switching request acknowledgement message carries relay related information of the w-UE. And the target base station stores the relevant information of the w-UE relay and releases the context and relevant resources of the w-UE through the source base station. Then, the eNB2 controls the w-UE, and carries out relevant measurement configuration and resource allocation.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of communication for a device pass-through system, comprising:

The User Equipment (UE) receives PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function;

the UE carries out configuration according to the PC5 interface configuration information;

the UE configures according to the PC5 interface configuration information, including:

the remote UE and the relay UE establish or modify or release PC5 bearing;

the remote UE establishing a PC5 bearer with the relay UE includes:

the remote UE sends PC5 bearer establishment configuration information to the relay UE; the remote UE receives PC5 bearer establishment completion information sent by the relay UE;

after the remote UE sends the PC5 bearer establishment configuration information to the relay UE, the method further includes:

the relay UE judges whether a forwarding Uu bearer is established, wherein the forwarding Uu bearer is used for forwarding remote UE data to a base station by the relay UE;

the relay UE determining whether to establish a forwarding Uu bearer includes:

and the relay UE determines whether a forwarding Uu bearer meeting the requirement exists according to PC5 bearer QoS information in PC5 bearer establishment configuration information sent by the remote UE and EPS bearer list information maintained by the relay UE, and if not, the relay UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to a network to establish or modify the forwarding Uu bearer.

2. The method of claim 1, wherein the PC5 interface configuration information includes at least one of:

3. The method of claim 1, wherein the UE comprises: remote UE and/or relay UE; the UE receiving PC5 interface configuration information includes:

the remote UE receives PC5 bearing configuration information sent by a base station; and/or

The relay UE receives PC5 bearing configuration information sent by a base station; and/or

The remote UE or the relay UE receives relay forwarding indication information sent by a base station; and/or

The remote UE receives mapping information between a PC5 logical channel group and a Uu logical channel priority or mapping information between a PC5 data packet priority and a Uu bearing QCI sent by a base station; and/or

And the relay UE receives mapping information between the PC5 logic channel group and Uu logic channel priority of the remote UE, which is sent by a base station.

4. The method of claim 2, wherein the PC5 bearer configuration information includes one or any combination of: the PC5 bears the establishment configuration information; the PC5 carries the configuration information; the PC5 carries release information.

5. The method of claim 2 or 4, wherein the PC5 bearer establishment configuration information in the PC5 bearer configuration information includes at least one of:

PC5 carries the identification, radio link control protocol acknowledged mode RLC AM configuration information, radio link control protocol unacknowledged mode RLC UM configuration information, logical channel identification LC ID, logical channel group identification LCG ID, priority guaranteed bit rate PBR, bucket size duration BSD, UE PC5 interface aggregate maximum bit rate, PC5 carries QoS information.

6. The method of claim 5, wherein the PC5 carrying QoS information comprises at least one of: the quality of service class QCI, guaranteed bit rate GBR, maximum bit rate MBR.

7. The method of claim 5, wherein the step of determining the position of the probe is performed,

the RLC AM configuration information includes at least one of: RLC AM sequence number length, polling retransmission timer, polling protocol data unit, polling byte number, maximum retransmission threshold, reordering timer, status prohibit timer; the RLC UM configuration information includes at least one of: the unacknowledged mode sequence number field is long, the maximum retransmission times, and the timer is reordered.

8. The method of claim 5, wherein the step of determining the position of the probe is performed,

and multiplexing EPS bearing or Uu bearing configuration of the User Equipment (UE) by the PC5 bearing identifier, the logic channel identifier and the logic channel group identifier in the PC5 bearing establishment configuration information.

9. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

the PC5 bearing modification configuration information is used for updating or reconfiguring any field combination in the PC5 bearing establishment configuration information; the PC5 carries release information including at least one of: the PC5 carrying the identity or logical channel identity needs to be released, releasing the reason.

10. The method according to claim 1 or 2, wherein the relay forwarding indication information received by the remote UE includes at least one of: a relay UE identifier, a control plane forwarding indicator, a user plane forwarding indicator, an uplink forwarding indicator, a downlink forwarding indicator, an EPS bearer identifier for relay forwarding, a DRB identifier for relay forwarding, a logical channel identifier for relay forwarding, an uplink data forwarding indicator corresponding to each EPS bearer, a downlink data forwarding indicator corresponding to each EPS bearer, and uplink and downlink data forwarding indicators corresponding to each EPS bearer;

11. The method of claim 1, wherein the remote UE establishing a PC5 bearer with the relay UE comprises:

the relay UE sends PC5 bearer establishment configuration information to the remote UE; and the relay UE receives the PC5 bearer establishment completion information sent by the remote UE.

12. The method of claim 11, wherein after the remote UE sends the PC5 bearer establishment configuration information to the relay UE, the method further comprises:

the relay UE receives PC5 bearer establishment configuration information sent by the remote UE; and/or

And the relay UE performs admission control on the remote UE.

13. The method of claim 12, wherein the relay UE admission control of the remote UE comprises:

the relay UE determines whether to accept to establish a new PC5 bearer according to the received PC5 bearer QoS information in the PC5 bearer establishment configuration information sent by the remote UE, the number of the established PC5 bearers of the relay UE and the resource load condition; or (b)

And the relay UE sends the remote UE identification to a base station, and the base station determines whether to allow the relay UE to accept and establish PC5 bearing according to resource scheduling or allocation conditions.

14. The method according to claim 1, wherein the service request, the bearer resource allocation request or the bearer resource modification request message initiated by the relay UE to the network carries a forwarding bearer indication, where the forwarding bearer indication is used to indicate to the network that the bearer is used to forward the remote UE data.

15. The method of claim 3, wherein after the relay UE receives the relay forwarding indication information sent by the base station, the method further comprises:

the relay UE judges whether to establish a forwarding Uu bearer, wherein the forwarding Uu bearer is used for forwarding remote UE data to a base station by the relay UE;

and the relay UE transmits relay forwarding response information to the base station.

16. The method of claim 15, wherein the relay forwarding response information comprises: relay forwarding acceptance information or relay forwarding rejection information, wherein the relay forwarding acceptance information includes: the EPS list of the remote UE that is allowed to be forwarded through the relay and the EPS list that is rejected to be forwarded through the relay.

17. The method according to claim 15, wherein after the relay UE receives the PC5 bearer configuration information sent by the base station or the relay UE sends the relay forwarding response information to the base station, the method further comprises:

The relay UE receives establishment configuration information for forwarding Uu bearer from a base station; the establishment configuration information of the forwarding Uu bearer includes at least one of: uu DRB identification, packet data convergence protocol PDCP configuration, RLC configuration, logical channel identification and logical channel configuration.

18. The method of claim 3, wherein before the remote UE receives the relay forwarding indication information sent by the base station, the method comprises:

the remote UE sends relay forwarding interest indication information to the base station through RRC special signaling, wherein the relay forwarding interest indication information comprises at least one of the following: relay forwarding interest, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer list expected to be forwarded by relay.

19. The method of claim 1, wherein the UE is configured according to the PC5 interface configuration information, comprising at least one of:

the remote UE or the relay UE completes the configuration of the PC5 bearer according to the received configuration information of the PC5 bearer, and sends an RRC reconfiguration completion message to the base station to inform the PC5 of the completion of the bearer establishment;

the remote UE or the relay UE completes PC5 bearer modification according to the received PC5 bearer modification configuration information, and sends RRC reconfiguration completion information to the base station to inform the PC5 of completion of bearer modification;

The remote UE or the relay UE completes PC5 bearer release according to the received PC5 bearer release information;

the remote UE associates the data of the EPS bearing needing to be forwarded by the relay UE with the corresponding PPPP according to the QCI of the EPS bearing according to the received relay forwarding indication information and the mapping information of the priority PPPP and the Uu bearing QCI of the PC5 data packet, and transmits the data through a PC5 interface;

the remote UE associates the data of the EPS bearing which is required to be forwarded by the relay UE with the corresponding PPPP according to the received relay forwarding indication information and the mapping information of the preconfigured PPPP and Uu bearing QCI, and transmits the data through a PC5 interface;

the remote UE associates the data of EPS bearing which is required to be forwarded by the relay UE with corresponding PPPP according to the received relay forwarding indication information and the received mapping information between the PC5 logical channel group and Uu logical channel priority, and transmits the data through a PC5 interface;

and the remote UE establishes a one-to-one correspondence between a PC5 bearing identifier or a PC5 logic channel identifier in the configuration information according to the received PC5 bearing or a PC5 bearing identifier or a PC5 logic channel identifier generated by the remote UE and an EPS bearing identifier or Uu DRB identifier or Uu logic channel identifier of a corresponding EPS bearing, and maps data of the EPS bearing which is required to be forwarded by the relay UE to the corresponding PC5 bearing/PC 5 logic channel for transmission.

20. A method of communication for a device pass-through system, comprising:

the remote User Equipment (UE) is accessed and/or connected to the relay UE;

the remote UE forwards data through the relay UE;

before the remote UE forwards data through the relay UE, the method includes:

the relay UE receives relay forwarding request information sent by a base station;

the relay UE sends relay forwarding response information to the base station;

after receiving the relay forwarding request information sent by the base station, the relay UE includes:

the relay UE performs admission control on E-RAB which is required to be forwarded through the relay in the relay forwarding request information, determines whether a forwarding Uu bearer meeting QoS requirements is established or not according to the bearer condition of the relay UE, and determines whether the established forwarding Uu bearer is allowed to be admitted;

if the received forwarding Uu bearer can be received, the relay UE initiates to establish a corresponding EPS bearer, or after receiving the relay forwarding response information sent by the relay UE, the base station sends configuration information for establishing the forwarding Uu bearer to the relay UE.

21. The method of claim 20, wherein the relay access manner supported by the remote UE and the relay UE comprises at least one of: a sidelink or PC5 interface, WLAN, bluetooth; the remote UE is accessed to/connected with the relay UE through the sidelink or PC 5; or the remote UE accesses the relay UE through the WLAN; or the remote UE accesses the relay UE through Bluetooth.

22. The method according to claim 20, wherein before the remote UE accesses and/or connects to the relay UE, the method further comprises:

the remote UE receives relay related configuration information sent by a base station, wherein the relay related configuration information is used for remote UE discovery, measurement, selection and access to relay UE;

and the remote UE completes configuration according to the relay related configuration information.

23. The method of claim 22, wherein the relay-related configuration information comprises at least one of:

relay measurement threshold, relay discovery threshold, relay selection hysteresis value, relay discovery transmission/reception resource, WLAN measurement threshold, WLAN measurement configuration information, WLAN selection threshold, WLAN selection hysteresis value, blueTooth selection threshold, blueTooth selection hysteresis value.

24. The method of claim 22, wherein before the remote UE receives the relay related configuration information sent by the base station, the method further comprises:

and the remote UE sends a relay forwarding interest indication to the base station.

25. The method of claim 24, wherein the step of determining the position of the probe is performed,

the relay forwarding interest indication includes at least one of: relay forwarding interest, a desired relay access mode, a control plane forwarding instruction, a user plane forwarding instruction, an uplink forwarding instruction, a downlink forwarding instruction, and an EPS bearer identifier or a DRB identifier or a logical channel identifier which is desired to be forwarded through the relay, wherein each EPS bearer corresponds to an uplink data forwarding instruction, a downlink data forwarding instruction, and uplink and downlink data forwarding instructions.

26. The method of claim 22, wherein before the remote UE receives the relay related configuration information sent by the base station, the method further comprises:

the base station receives relay support indication information or relay support update information sent by relay UE, wherein the relay support update information is used for updating/modifying/reconfiguring any field in the relay support indication information.

27. The method of claim 26, wherein the relay support indication information comprises at least one of: and the relay UE identification, the relay support indication, the supported relay access mode, WLAN information and Bluetooth information.

28. The method of claim 27, wherein the WLAN information comprises: WLAN terminal WT identification, WLAN identification, basic service set identification BSSID, WLAN operation type, WLAN country code, maximum capacity, WLAN bandwidth information, service set identification SSID, homogeneous extended service set hesssid.

29. The method of claim 22, wherein the configuring by the remote UE according to the relay-related configuration information comprises:

the remote UE executes relay measurement or relay discovery or WLAN measurement and reports a measurement result to a base station; or (b)

And the remote UE executes relay measurement or relay discovery or WLAN measurement, and selects relay UE or WLAN or BlueTooth according to a relay measurement result or a relay selection threshold or relay selection hysteresis value or WLAN measurement result or WLAN selection threshold or WLAN selection hysteresis value or BlueTooth selection threshold or BlueTooth selection hysteresis value.

30. The method of claim 29, wherein after the remote UE reports the measurement result to the base station, the method comprises:

the base station selects relay UE for the remote UE and informs the remote UE of the selected relay UE through RRC special signaling; the notifying the remote UE of the selected relay UE through RRC-dedicated signaling includes: the ProSe layer2 of the relay UE identifies ProSe layer2 ID, or the C-RNTI identification of the relay UE, or the WLAN MAC address of the relay UE.

31. The method according to claim 20, wherein after the remote UE accesses and/or connects to the relay UE, comprising:

the remote UE or the relay UE sends a relay connection state report to a base station; the relay connection status report includes at least one of: the WLAN MAC address of the remote UE, the ProSe UE ID of the relay UE, the relay access mode, the connection success, the connection failure and the failure reason.

32. The method of claim 20, wherein the relay forwarding request information comprises at least one of: the WLAN MAC address of the remote UE, the ProSe UE ID of the remote UE, and the E-RAB identifier, qoS parameters and eNB GTP tunnel termination point of the remote UE which are expected to be forwarded through relay.

33. The method of claim 20, wherein the relay forwarding response information comprises at least one of: E-RAB identification list allowing to be forwarded through the relay, E-RAB identification list refusing to be forwarded through the relay.

34. The method of claim 20, wherein forwarding Uu bearer configuration information sent by a base station to the relay UE comprises at least one of: uu DRB identification, pdcp configuration, rl configuration, logical channel identification, and logical channel configuration.

35. The method of claim 20, wherein before the remote UE forwards data through the relay UE, the method comprises:

the remote UE receives relay forwarding indication information sent by a base station, wherein the relay forwarding indication information comprises at least one of the following components: control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer identification capable of forwarding through relay, DRB identification capable of forwarding through relay, logical channel identification capable of forwarding through relay, uplink data forwarding indication, downlink data forwarding indication, uplink and downlink data forwarding indication corresponding to each EPS bearer.

36. A communication method for relaying through a system of devices, comprising:

the base station receives the relay related configuration information;

the base station executes processing corresponding to the relay related configuration information according to the relay related configuration information;

the base station executes processing corresponding to the relay related configuration information according to the relay related configuration information, and the processing comprises the following steps:

the base station sends a relay forwarding bearer establishment request to the relay UE, and the base station receives a relay forwarding bearer establishment response sent by the relay UE;

after the base station sends the relay forwarding bearer establishment request information to the relay UE, the method includes:

the relay UE carries out admission control on E-RAB which is required to be forwarded through the relay in the relay forwarding bearer establishment request information, determines whether a forwarding Uu bearer meeting QoS requirements is established or not according to the bearer condition of the relay UE, and determines whether the forwarding Uu bearer which is allowed to be admitted and established is allowed to be established;

if the forwarding Uu bearer allowed to be received and established exists, the relay UE initiates to establish a corresponding EPS bearer, or after the base station receives the relay forwarding bearer establishment response information sent by the relay UE, the base station sends configuration information for establishing the forwarding Uu bearer to the relay UE.

37. The method of claim 36, wherein the base station receiving relay-related configuration information comprises:

the base station acquires the relay related configuration information from a Mobility Management Entity (MME) through an S1 interface; or (b)

And the base station acquires the relay related configuration information from the adjacent base station or the target base station through an X2 interface.

38. The method of claim 36, wherein the relay-related configuration information comprises at least one of: relay forwarding interest/request, relay forwarding bearer indication, remote UE identification, access mode, relay UE identification, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, uplink and downlink forwarding indication, UE PC5 aggregate maximum bit rate; the access mode comprises the following steps: D2D access, WLAN access, blueTooth access.

39. The method of claim 37, wherein the base station obtains the relay related configuration information from an MME over an S1 interface, comprising at least one of:

the base station acquires the relay related configuration information from an MME through a bearer establishment request or a bearer modification request message of an S1 interface;

the base station acquires the relay related configuration information from an MME through an initial context establishment request or a UE context modification request message of an S1 interface;

The base station acquires the relay related configuration information from an MME through a switching request of an S1 interface and a path switching request confirmation message;

and the base station acquires the relay related configuration information from the MME through an MME configuration transmission message of an S1 interface.

40. The method of claim 37, wherein the base station obtains relay-related configuration information from a neighboring/target base station over an X2 interface, comprising at least one of:

the base station acquires the relay related configuration information from the adjacent base station or the target base station through the switching request message of the X2 interface;

the base station acquires relay related configuration information from a neighboring base station or a target base station through an X2 establishment request or an X2 establishment response message of an X2 interface;

and the base station acquires relay related configuration information from the adjacent base station or the target base station through the base station configuration transmission message of the X2 interface.

41. The method of claim 37, wherein prior to the base station obtaining the relay related configuration information from an MME over an S1 interface, comprising:

and the MME receives relay related configuration information sent by the remote UE or the relay UE.

42. The method of claim 41, further comprising: the remote UE or relay UE transmits the relay related configuration information through at least one message of: attach request, service request, bearer resource allocation request, bearer resource modification request.

43. The method of claim 36, wherein the base station performing processing corresponding to the relay-related configuration information according to the relay-related configuration information comprises:

if the base station receives relay forwarding interest or relay forwarding request, the base station selects or configures relay UE for remote UE; if the base station receives the relay forwarding bearer indication, the base station distinguishes the Uu bearer of the relay UE and the Uu bearer of the relay UE forwarding data according to the relay forwarding bearer indication so as to correctly map the downlink remote UE data to the corresponding Uu bearer;

if the base station receives relay related configuration information of at least one of the following: the base station stores the received relay related configuration information, and carries out measurement configuration, resource configuration and/or bearing configuration on the remote UE and/or the relay UE according to different access modes;

and if the base station receives UE PC5 aggregate maximum bit rate UE-PC5-AMBR, the base station performs PC5 resource allocation for the remote UE or the relay UE according to the UE-PC 5-AMBR.

44. The method of claim 43, further comprising:

After the base station receives the UE-PC5-AMBR, the base station sends the UE-PC5-AMBR to a remote UE or a relay UE through RRC dedicated signaling;

and the remote UE or the relay UE autonomously selects resources to perform PC5 communication according to the UE-PC 5-AMBR.

45. The method of claim 43, wherein,

the relay forwarding bearer establishment request information includes at least one of: the WLAN MAC address of the remote UE, the ProSe UE ID of the remote UE, the E-RAB identifier expected to be forwarded by the remote UE through relay, qoS parameters and an eNB GTP tunnel terminal; and/or

The relay forwarding bearer establishment response information includes at least one of: E-RAB identification list allowing to be forwarded through the relay, E-RAB identification list refusing to be forwarded through the relay.

46. A communication method for relaying through a system of devices, comprising:

the base station sends PC5 interface configuration information to User Equipment (UE), wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function;

the UE includes: remote UE and relay UE; the base station sending the PC5 interface configuration information to the UE includes:

the base station sends PC5 bearing configuration information to the remote UE; and/or

The base station sends PC5 bearing configuration information to the relay UE;

before the base station sends the PC5 interface information to the remote UE, the base station comprises:

the base station receives relay forwarding interest indication information sent by the remote UE through RRC dedicated signaling, where the relay forwarding interest indication information includes at least one of: relay forwarding interest, control plane forwarding indication, user plane forwarding indication, uplink forwarding indication, downlink forwarding indication, EPS bearer list expected to be forwarded by relay;

after the base station sends the relay forwarding indication information to the relay UE, the method further includes:

the base station receives relay response information sent by the relay UE, wherein the relay response information comprises: relay forwarding acceptance information or relay forwarding rejection information, wherein the relay forwarding acceptance information includes: the EPS list of the remote UE that is allowed to be forwarded through the relay and the EPS list that is rejected to be forwarded through the relay.

47. The method of claim 46, wherein the PC5 interface configuration information includes at least one of:

48. The method of claim 46, wherein the UE comprises: remote UE and/or relay UE; the base station sending the PC5 interface configuration information to the UE includes:

the base station sends relay forwarding indication information to the remote UE or the relay UE; and/or the remote UE receives mapping information between a PC5 logical channel group and Uu logical channel priority or mapping information between a PC5 data packet priority and Uu bearing QCI sent by a base station; and/or

49. The method of claim 46, wherein the UE comprises: remote UE and relay UE; the method further comprises the steps of: the base station receives a remote UE identifier sent by the relay UE; and the base station determines whether to allow the relay UE to accept and establish the PC5 bearer according to the resource scheduling or allocation condition.

50. The method of claim 46, wherein when the UE is a relay UE, the base station sends PC5 interface configuration information to the relay UE, the method further comprising:

the base station sends establishment configuration information for forwarding Uu bearer to the relay UE; the establishment configuration information of the forwarding Uu bearer includes at least one of: uu DRB identification, packet data convergence protocol PDCP configuration, RLC configuration, logical channel identification and logical channel configuration.

51. A communication apparatus of a device-through system, applied to a user equipment UE, characterized in that the apparatus comprises:

the receiving module is used for receiving PC5 interface configuration information, wherein the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function;

the configuration module is used for carrying out configuration according to the PC5 interface configuration information;

the configuration module is also used for establishing or modifying or releasing PC5 bearing between the remote UE and the relay UE;

the configuration module is also used for the remote UE to send PC5 bearer establishment configuration information to the relay UE; the remote UE receives PC5 bearer establishment completion information sent by the relay UE;

the device is further configured to, after the remote UE sends PC5 bearer establishment configuration information to the relay UE, determine whether to establish a forwarding Uu bearer, where the forwarding Uu bearer is used by the relay UE to forward remote UE data to the base station;

the device is further configured to determine whether a forwarding Uu bearer meeting a requirement exists according to PC5 bearer QoS information in PC5 bearer setup configuration information sent by the remote UE and EPS bearer list information maintained by the relay UE, if not, the relay UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to a network, and establishes or modifies the forwarding Uu bearer.

52. The apparatus of claim 51, wherein the PC5 interface configuration information includes at least one of:

53. A communication apparatus of a device-through system, applied to a remote user equipment UE, the apparatus comprising:

an access module for accessing and/or connecting to the relay UE;

a forwarding module, configured to forward data through the relay UE;

the device is further configured to, before the remote UE forwards data through the relay UE, receive relay forwarding request information sent by a base station by using the relay UE;

the relay UE sends relay forwarding response information to the base station;

the device is further configured to, after the relay UE receives the relay forwarding request information sent by the base station, perform admission control on an E-RAB expected to be forwarded by a relay in the relay forwarding request, where the relay UE determines, according to a bearer condition of the relay UE, whether there is an established forwarding Uu bearer that meets a QoS requirement, and determines that admission is allowed to be performed on the established forwarding Uu bearer;

54. The apparatus of claim 53, wherein the relay access manner supported by the remote UE and the relay UE comprises at least one of: a sidelink or PC5 interface, WLAN, bluetooth; the remote UE is accessed to/connected with the relay UE through the sidelink or PC 5; or the remote UE accesses the relay UE through the WLAN; or the remote UE accesses the relay UE through Bluetooth.

55. A communication system, comprising: the system comprises User Equipment (UE) and a base station, wherein the UE is used for receiving PC5 interface configuration information sent by the base station and configuring according to the PC5 interface configuration information, and the PC5 interface configuration information is used for configuring the UE to support a device-to-device (D2D) communication function;

the remote UE is used for establishing or modifying or releasing PC5 bearing with the relay UE;

the remote UE establishes a PC5 bearer with the relay UE by: the remote UE sends PC5 bearer establishment configuration information to the relay UE; the remote UE receives PC5 bearer establishment completion information sent by the relay UE;

After the remote UE sends the PC5 bearer establishment configuration information to the relay UE, the relay UE is configured to determine whether to establish a forwarding Uu bearer, where the forwarding Uu bearer is used by the relay UE to forward the remote UE data to the base station;

the relay UE determines whether to establish a forwarding Uu bearer by: and the relay UE determines whether a forwarding Uu bearer meeting the requirement exists according to PC5 bearer QoS information in PC5 bearer establishment configuration information sent by the remote UE and EPS bearer list information maintained by the relay UE, and if not, the relay UE initiates a service request, a bearer resource allocation request or a bearer resource modification request to a network to establish or modify the forwarding Uu bearer.

56. A communication system, comprising: a remote user equipment UE and a relay UE, wherein the remote UE is configured to access and/or connect to the relay UE, and forward data through the relay UE;

before the remote UE forwards data through the relay UE, the relay UE is also used for receiving relay forwarding request information sent by a base station;

the relay UE is also used for sending relay forwarding response information to the base station;

after the relay UE receives the relay forwarding request information sent by the base station, the relay UE is further configured to perform admission control on an E-RAB expected to be forwarded by a relay in the relay forwarding request, and the relay UE is further configured to determine, according to a bearer condition of the relay UE, whether there is an established forwarding Uu bearer meeting QoS requirements, and determine to allow admission of the established forwarding Uu bearer; if the relay UE can accept the established forwarding Uu bearer, the relay UE is also used for initiating establishment of the corresponding EPS bearer, or after the base station receives the relay forwarding response information sent by the relay UE, the base station sends configuration information for establishing the forwarding Uu bearer to the relay UE.