CN103024924B

CN103024924B - Connection establishment method, device and system for D2D (device-to-device) terminals

Info

Publication number: CN103024924B
Application number: CN201110300160.4A
Authority: CN
Inventors: 常俊仁; 冯淑兰; 时洁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2017-04-12
Anticipated expiration: 2031-09-28
Also published as: WO2013044855A1; CN103024924A

Abstract

The invention discloses a connection establishment method, a connection establishment device and a connection establishment system for D2D (device-to-device) terminals. The method comprises the following steps that: first user equipment UE sends a preamble to a base station; the first UE receives a random access response message which responds to the preamble and is sent by the base station; the first UE sends a second UE identifier to the base station, and second UE is the D2D communication objective of the first UE; the first UE receives D2D link configuration parameters of the first UE and RRC connection configuration parameters which respond to the second UE identifier and are sent by the base station; and the first UE establishes a D2D connection based on the D2D link configuration parameters of the first UE and the second UE, and completes the establishment of an RRC connection between the first UE and the base station based on the RRC connection configuration parameters.

Description

Connection establishment method, device and system of D2D terminal

Technical Field

The present invention relates to communication technologies, and in particular, to a method, an apparatus, and a system for establishing a Device-to-Device (D2D) terminal connection.

Background

In a cell network, when a User Equipment (UE) needs to communicate with other UEs, it is usually necessary to perform centralized control by a base station, for example, an Evolved Node B (eNB) in an LTE network controls a signal connection procedure such as call setup between UEs of both calling parties. The advantage of the base station coordinated control of the communication links between users is that the base station can centrally manage the use of radio resources in the cell, so that the radio resources are reasonably and effectively distributed, and simultaneously, the radio interference between users can be well avoided. However, when two user equipments are relatively close to each other, if communication is performed through the base station, radio resources are wasted. Compared with the communication mode of the cell mode, the D2D communication can save half of the radio resources when the same data amount is transmitted. The D2D communication is direct communication between terminals, so information transmitted between terminals of the D2D communication need not pass through the base station.

In an existing wireless network, when a UE in an idle mode receives a paging message (paging) sent by a network side, the UE first needs to acquire a Timing Advance (TA) value and/or a suitable transmission power value through a Random Access (RA) process to establish a connection with the network, so as to transmit user data.

A signaling diagram of UE and eNB connection establishment in the prior art is shown in fig. 1.

Step 11, the first UE sends a Preamble to the eNB;

step 12, the eNB returns a Random Access response message (Random Access response message) to the first UE, where the response message includes an uplink synchronization TA value and a suitable transmission power;

step 13, the first UE sends RRC connection establishment request information to the eNB by using the transmitting power;

step 14, the eNB returns a conflict resolution message (content resolution) to the first UE;

step 15, the eNB returns RRC connection configuration parameters to the first UE;

step 16, the first UE sends an RRC connection setup complete message to the eNB.

However, for the UEs with closer D2D, the UEs have approximately the same TA and/or transmission power, so when the eNB calls the second UE of the called party for data transmission of D2D, if the base station establishes a connection with the second UE according to the communication method shown in fig. 1, the second UE of the called party performs an unnecessary random access procedure, thereby increasing the delay of connection establishment.

Disclosure of Invention

The embodiment of the invention provides a connection establishment method, a device and a system for a D2D terminal, which can solve the problem that in the prior art, when a UE at a short distance performs D2D communication, time delay is increased because a called user terminal executes an unnecessary random access process.

In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:

in one aspect, an embodiment of the present invention provides a method for establishing a connection from a device to a device D2D terminal, where the method includes: the first user equipment UE sends a preamble to the base station; the first UE receives a random access response message sent by the base station in response to the preamble; the first UE sends a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE; the first UE receives the D2D link configuration parameters and the RRC connection configuration parameters of the first UE, which are returned by the base station in response to the second UE identification; the first UE establishes a D2D connection with the second UE based on the D2D link configuration parameters of the first UE and completes RRC connection establishment with a base station based on the RRC connection configuration parameters.

On the other hand, an embodiment of the present invention provides a method for establishing a connection from a device to a device D2D terminal, including: the second User Equipment (UE) receives a paging message from the base station and acquires the D2D link configuration parameters of the second UE based on the paging message; the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

On the other hand, an embodiment of the present invention provides a method for establishing a connection from a device to a device D2D terminal, including: the second User Equipment (UE) receives the D2D link configuration parameters and the RRC connection configuration parameters of the second UE, which are forwarded by the first UE from the base station; the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters.

On the other hand, an embodiment of the present invention provides a method for establishing a connection from a device to a device D2D terminal, including: receiving a preamble from a first UE; responding to the preamble and sending a random access response message to the first UE; receiving a second UE identity from a first User Equipment (UE); transmitting, to a first UE, the D2D link configuration parameters of the first UE based on the second UE identity, the D2D link configuration parameters of the first UE being for D2D connectivity of the first UE with the second UE.

In another aspect, an embodiment of the present invention provides a first user equipment UE, including: the first sending device is used for sending a preamble to a base station and sending a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE; a first receiving device, configured to receive a random access response message sent by the base station in response to the preamble, and configured to receive a D2D link configuration parameter and an RRC connection configuration parameter of the first UE, which are returned by the base station in response to the second UE identity; and a first connection establishing device, configured to establish a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and complete RRC connection establishment with a base station based on the RRC connection configuration parameters.

In another aspect, an embodiment of the present invention provides a second user equipment UE, including: the second receiving device is used for receiving the paging message from the base station and acquiring the D2D link configuration parameters of the second UE based on the paging message; second connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

In another aspect, an embodiment of the present invention provides a second user equipment, including: third receiving means, configured to receive the D2D link configuration parameter and the RRC connection configuration parameter of the second UE forwarded by the first UE from the base station; third connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE, and completing RRC connection establishment with a base station based on the RRC connection configuration parameters.

In another aspect, an embodiment of the present invention provides a base station, including: a fourth receiving device, configured to receive the preamble from the first UE, and to receive the second UE identity from the first UE; a fourth sending device, configured to send a random access response message to the first UE in response to the preamble, and send a D2D link configuration parameter of the first UE to the first UE based on the second UE identity, where the D2D link configuration parameter of the first UE is used for the D2D connection between the first UE and the second UE.

In another aspect, an embodiment of the present invention provides a communication system, which includes the first user equipment, the second user equipment, and a base station.

The embodiment of the invention only needs the process of random access between the calling user equipment and the base station, and the random access process does not need to be repeated between the called user equipment and the base station, thereby reducing the time delay of D2D connection establishment. The embodiment of the invention can also avoid the influence of the paging process on the core network, and further reduce the time delay of D2D connection establishment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a signaling diagram illustrating connection establishment between a UE and an eNB in the prior art;

fig. 2 shows a schematic flow chart of a connection setup method of a D2D terminal according to one embodiment of the invention;

fig. 3 shows a schematic flow chart of a connection setup method of a D2D terminal according to another embodiment of the invention;

FIG. 4 shows a schematic block diagram of a first UE according to one embodiment of the invention;

FIG. 5 shows a schematic block diagram of a second UE according to an embodiment of the present invention;

FIG. 6 shows a schematic block diagram of a second UE according to an embodiment of the present invention;

fig. 7 shows a schematic block diagram of a base station according to an embodiment of the present invention.

Detailed Description

The following describes a connection establishment method, system and apparatus for the D2D terminal in detail.

Fig. 2 shows a schematic flow chart of a connection setup method of a D2D terminal according to one embodiment of the invention.

Referring to fig. 2, to establish a D2D connection between a first UE of a calling user equipment and a second UE of a called user equipment, the following steps are performed:

step 201: the first user equipment UE sends a preamble to a base station;

step 202: the base station sends a random access Response (RA) response message to the first UE after receiving the preamble sent by the first UE, so that the first UE receives the random access response message sent by the base station in response to the preamble. The message may carry a timing advance TA value and/or a transmission power value for the first UE, so as to be used by the first UE accessing the base station.

Step 203: the first UE sends a second UE identity to the base station, the second UE being a D2D communication target of the first UE, i.e., the first UE is to establish D2D communication with the second UE. The second UE identity may be, for example, a temporary mobile subscriber identity (S-TMSI) or other identity of the second UE. The first UE may obtain the identity of the second UE by detecting the second UE, or may use the subscriber number of the second UE. The first UE may send an RRC connection establishment request message to the base station, where the RRC connection establishment request message carries the second UE identity.

Step 204: the base station sends the D2D link configuration parameters and the RRC connection configuration parameters of the first UE to the first UE in response to the second UE identification, so that the first UE receives the D2D link configuration parameters and the RRC connection configuration parameters of the first UE returned by the base station in response to the second UE identification, wherein the D2D link configuration parameters are used for the D2D connection between the first UE and the second UE. Specifically, the D2D link configuration parameters and RRC connection configuration parameters include static or semi-static parameter configurations of each of a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. Here, the base station may send an RRC connection setup message to the first UE, in which the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identity are carried. It is also possible that the base station transmits scheduling information of the D2D link configuration parameter and the RRC connection configuration parameter of the first UE to the first UE through a D2D cell radio network temporary identifier (D2D-C-RNTI) scrambling Physical Downlink Control Channel (PDCCH), so that the first UE descrambles the physical downlink control channel PDCCH by using the D2D-C-RNTI to acquire the scheduling information of the D2D link configuration parameter and the RRC connection configuration parameter of the first UE transmitted by the base station, and further acquires the D2D link configuration parameter and the RRC connection configuration parameter of the first UE according to the scheduling information. In the case of transmitting the scheduling information using the D2D-C-RNTI, the first UE needs to first acquire the D2D-C-RNTI allocated by the base station. For this reason, the first UE may obtain the D2D-C-RNTI through an RA response message or a content response message sent by the base station, where the D2D-C-RNTI is carried in the RA response message or the content response message, or the first UE may also receive a D2D-C-RNTI allocation message directly sent by the base station.

Step 205: the base station sends a paging message to the second UE, where the paging message is used to indicate the D2D link configuration parameter and the RRC connection configuration parameter of the second UE, and the paging message may also carry a timing advance TA value and/or a transmission power value for the second UE, or may indicate that the first UE and the second UE share the timing advance TA value and/or the transmission power value, so that the second UE uses the TA value and/or the transmission power value shared with the first UE as the TA value and/or the transmission power value of the second UE to access the second UE to the base station. In addition, the paging message also includes S-TMSI of the second UE, and Cell-Radio Network Temporary Identity (C-RNTI) allocated to the second UE. Accordingly, the second UE correspondingly receives the paging message from the base station, and acquires the D2D link configuration parameters and the RRC connection configuration parameters of the second UE based on the paging message, wherein the D2D link configuration parameters are used for the D2D connection between the second UE and the first UE. The D2D link configuration parameters and the RRC connection configuration parameters of the second UE may be carried in a paging message sent by the base station to the second UE, or may be sent a paging response message after the second UE receives the paging message from the base station and determines that D2D communication is allowed, so as to confirm that D2D communication is possible, and after that, the base station sends the D2D link configuration parameters and the RRC connection configuration parameters of the second UE to the second UE through another message. In addition, it is also possible that the base station transmits scheduling information of a D2D link configuration parameter and an RRC connection configuration parameter of the second UE to the second UE through a D2D-C-RNTI scrambled Physical Downlink Control Channel (PDCCH), so that the second UE descrambles the physical downlink control channel PDCCH by using the D2D-C-RNTI to acquire the scheduling information of the D2D link configuration parameter and the RRC connection configuration parameter of the second UE transmitted by the base station, and further acquires the D2D link configuration parameter and the RRC connection configuration parameter of the second UE according to the scheduling information. The second UE may also use the D2D-C-RNTI to obtain the timing advance TA value and/or the transmit power value. It should be noted that, in the case of transmitting the scheduling information using the D2D-C-RNTI, the second UE needs to first acquire the D2D-C-RNTI allocated by the base station. For this purpose, the second UE receives the D2D-C-RNTI allocation message sent by the base station, and the D2D-C-RNTI allocation message may be carried in the paging message sent by the base station to the second UE or may be sent through a separate message.

Before the base station sends the paging message to the second UE, the base station may further allocate an uplink grant UL grant to the second UE according to the C-RNTI of the second UE, where the UL grant may be included in the paging message sent by the base station and sent to the second UE, or may be sent to the second UE as a separate message by the base station.

Step 206: and the first UE establishes D2D connection with the second UE and completes the RRC connection establishment with the base station based on respective RRC connection configuration parameters. Since the first UE obtained its D2D link configuration parameters through step 204 and the second UE obtained its D2D link configuration parameters through step 205, the first UE and the second UE may establish a D2D connection with each other. After the connection establishment, the first UE and the second UE may respectively send an RRC connection establishment complete message and a D2D connection configuration complete message to the base station.

In this embodiment, the TA value and/or the transmission power value of the second UE may be a TA value and/or a transmission power value shared with the first UE. There may be a variety of ways to determine whether a first UE shares a TA value and/or a transmit power value with a second UE. One way is that, before step 201, the first UE detects the second UE to obtain a path loss or a distance between the first UE and the second UE, and also obtains a second UE identity, and the first UE determines, according to the path loss or the distance, that the second UE can share the TA value and/or the transmission power value with the first UE. At this time, the first UE may send, to the base station, the RRC connection establishment request message carrying indication information indicating that the first UE and the second UE share the time advance TA value and/or the transmission power value, and the second UE identifier, so that the base station can send the shared TA value and/or the transmission power value to the second UE. Alternatively, before step 201, the first UE detects the second UE to obtain the path loss or distance between the first UE and the second UE, and also obtains the second UE identity. The first UE then reports the pathloss or distance and the second UE identity to the base station for the base station to determine whether the second UE is able to share a TA value and/or a transmit power value with the first UE. When the base station determines that the second UE can share the TA value and/or the transmission power value with the first UE, the base station sends the shared TA value and/or the transmission power value to the second UE.

In this embodiment, when the first UE and the second UE listen to the PDCCH through the D2D-C-RNTI allocated by the base station to obtain the scheduling information, and receive one or more of the RRC connection configuration parameter, the D2D link configuration parameter, and the TA value and/or the transmission power value information for the second UE according to the scheduling information, the method for using the D2D-C-RNTI to perform the monitoring and transmitting of the PDCCH is specifically as follows:

the first UE and the second UE monitor by using the D2D-C-RNTI, the base station sends the PDCCH by using the D2D-C-RNTI, and the PDCCH is added with the following new indication information:

00 denotes that both UEs need to receive downlink DL-SCH resources from the base station;

10, the main UE of the Ud link transmits and the auxiliary UE monitors;

01 represents that the primary UE of the Ud link receives and the auxiliary UE transmits;

11 (or resource information indicating that both UEs need to transmit uplink UL-SCH to the base station, the resource may be divided into two parts for use by the two UEs, respectively).

In the above, only two UEs are taken as an example, if the number of UEs exceeds two, more bit information may be used to indicate the transceiving operation of each UE. That is, the PDCCH scheduling information of the D2D UE transmitted by the base station using the D2D-C-RNTI scrambling includes the following information:

receiving and sending state indication information of each UE in a currently scheduled time unit;

the indication information of the receiving and sending states of each UE can be indicated through bits at different positions, and the position information in the indication information corresponding to each UE can be pre-configured through high-level signaling.

In this embodiment, the first UE and the second UE are sent their respective D2D link configuration parameters by the base station. It can be seen that, in the process of establishing the D2D communication between the first UE and the second UE, only the random access process needs to be performed between the first UE and the base station, and the second UE and the base station do not need to repeatedly perform the random access, thereby reducing the time delay of the D2D connection establishment. In addition, because the S-TMSI is unique within the TA range and unique within the base station range, there is no need for the base station to inform the Mobility Management Entity (MME) that the paging for the second UE will be performed during the paging of the second UE by the base station, which avoids the impact of the paging procedure on the core network, thereby further reducing the delay of the D2D connection establishment. The present invention does not limit whether the base station performs paging through the MME.

In addition, in the communication process, the first UE or the second UE may detect the path loss or the distance between the first UE and the second UE periodically or event-triggered, and after the first UE and the second UE establish a connection with the network, the subsequent base station may separately maintain TA updates of the first UE and the second UE, that is, separately send a TA command to the first UE and the second UE. Or determining to use a TA command for updating according to the distance information reported by the UE at regular time or event trigger, and if one TA command is used, the first UE and the second UE both use the point-to-point cell radio network temporary identifier (D2D-C-RNTI) to obtain the scheduling information of the TA command, and then update according to the obtained TA command.

Fig. 3 shows a schematic flow chart of a connection setup method of a D2D terminal according to another embodiment of the invention.

Referring to fig. 3, to establish a D2D connection between a first UE of a calling user equipment and a second UE of a called user equipment, the following steps are performed:

step 301: the first user equipment UE sends a preamble to a base station;

step 302: the base station sends a random access Response (RA) response message to the first UE after receiving the preamble sent by the first UE, so that the first UE receives the random access response message sent by the base station in response to the preamble. The message may carry a timing advance TA value and/or a transmission power value for the first UE, so as to be used by the first UE accessing the base station.

Step 303: the first UE sends a second UE identity to the base station, the second UE being a D2D communication target of the first UE, i.e., the first UE is to establish D2D communication with the second UE. The second UE identity may be, for example, a temporary mobile subscriber identity (S-TMSI) or other identity of the second UE. Here, the first UE may send an RRC connection establishment request message to the base station, where the RRC connection establishment request message carries the second UE identity.

The steps 301-303 correspond to the steps 201-203 in fig. 2.

Step 304: the base station sends the D2D link configuration parameters and the RRC connection configuration parameters of the first UE and the second UE to the first UE in response to the second UE identification, and also sends the TA value and/or the transmission power value information of the second UE to the first UE. It is also possible that the first UE and the second UE share the TA value and/or the transmission power value, and at this time, the base station sends, to the first UE, the indication information that the second UE shares the TA value and/or the transmission power value with the first UE. Here, the base station may send an RRC connection setup message to the first UE, where the RRC connection setup message carries the D2D link configuration parameters and the RRC connection configuration parameters of the first UE and the second UE, and the TA value and/or the transmission power value information of the second UE, or the indication information that the second UE shares the TA value and/or the transmission power value with the first UE. It is also possible that the base station transmits the scheduling information of the information to the first UE by scrambling a Physical Downlink Control Channel (PDCCH) with the D2D-C-RNTI, so that the first UE descrambles the PDCCH with the D2D-C-RNTI to obtain the scheduling information, and further obtains the information according to the scheduling information. Likewise, in case of transmitting scheduling information using D2D-C-RNTI, the first UE needs to first acquire D2D-C-RNTI allocated by the base station. For a detailed description, reference may be made to the embodiment described above with reference to fig. 2, which is not described herein again.

Since many configurations of the first UE and the second UE are the same, the configuration information of the first UE and the second UE may use Delta configuration in order to save message resources. In the embodiment of the invention, Delta configuration means that the same configuration information only appears once, so that message resources can be saved.

Step 305: the first UE sends the D2D link configuration parameters and the RRC connection configuration parameters of the second UE and the TA value and/or the transmission power value information of the second UE to the second UE, or sends the D2D link configuration parameters and the RRC connection configuration parameters of the second UE and the shared TA value and/or the transmission power value to the second UE. Thus, the second UE receives the D2D link configuration parameters and RRC connection configuration parameters and TA values and/or transmit power values of the second UE transmitted by the first UE accordingly. Here, it is also possible that the first UE sends D2D cell radio network temporary identity D2D-C-RNTI to the second UE, where the D2D-C-RNTI is used for the second UE to obtain scheduling information of the second UE from the PDCCH, so that the second UE can descramble the PDCCH using the D2D-C-RNTI to obtain the scheduling information sent by the base station, and further obtain the above information of the second UE according to the scheduling information.

Step 306: the first UE establishes a D2D connection with the second UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters of the first UE, and the second UE establishes a D2D connection with the first UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters of the second UE. Since the first UE obtained its D2D link configuration parameters through step 304 and the second UE obtained its D2D link configuration parameters through step 305, the first UE and the second UE may establish a D2D connection with each other.

After the second UE completes the configuration, a Uu RRC connection setup complete (i.e., RRC connection between the second UE and the base station) and a Ud D2D link (i.e., D2D link between the first UE and the second UE) configuration complete message may be fed back to the first UE. And after receiving the RRC connection setup complete message and the D2D link configuration complete message fed back by the second UE, the first UE may send the RRC connection setup complete message and the D2D configuration complete message to the base station in a unified manner.

In this embodiment, the TA value and/or the transmission power value of the second UE may be a TA value and/or a transmission power value shared with the first UE. There are also a number of ways to determine whether a first UE shares a TA value and/or a transmit power value with a second UE. Reference may be made in this regard to the embodiment described above in connection with fig. 2, which is not described in further detail here.

The TA value updating process in this embodiment is the same as the embodiment shown in fig. 2, and is not described again.

In this embodiment, in the process of establishing the D2D communication between the first UE and the second UE, only the random access process needs to be performed between the first UE and the base station, and the second UE and the base station do not need to repeatedly perform the random access, thereby reducing the delay of establishing the D2D connection.

In the above embodiments, if the first UE has established a connection with the base station before initiating the D2D communication request with the second UE, that is, the first UE is currently in a connected state, the first UE only needs to send a D2D communication request message with the second UE to the base station, where the request message includes: an identity of the second UE, for example, an S-TMSI or a subscriber number, a TA value and/or a transmission power value shared by the first UE and the second UE, or indication information of the TA value and/or the transmission power value shared by the first UE and the second UE, or the request message includes: the identity of the second UE, e.g., S-TMSI or subscriber number, the path loss or distance between the first UE and the second UE.

If the second UE that the first UE requests to establish D2D communication has already established a connection with the base station, that is, the second UE is currently in a connected state, the base station may omit the step of paging the second UE, and the base station only needs to send a D2D connection establishment request to the second UE to inquire whether the second UE allows D2D communication with the first UE. Or the base station may determine whether to allow the first UE to perform D2D communication with the second UE and, if so, notify the second UE to establish D2D communication with the first UE.

The invention also provides corresponding embodiments of the user equipment, the base station and the communication system.

According to one embodiment of the invention, a first user equipment, UE, is provided. Fig. 4 shows a schematic block diagram of a first UE according to an embodiment of the present invention. As can be seen, the first UE 40 comprises: a first sending device 401, configured to send a preamble to a base station, and send a second UE identity to the base station, where the second UE is a D2D communication target of a first UE; a first receiving device 402, configured to receive a random access response message sent by the base station in response to the preamble, and configured to receive a D2D link configuration parameter and an RRC connection configuration parameter of the first UE, which are returned by the base station in response to the second UE identity; and a first connection establishing device 403, configured to establish a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and complete RRC connection establishment with a base station based on the RRC connection configuration parameters.

According to one embodiment, the first user equipment further comprises: a first sharing determination device 404, configured to detect a second UE to obtain a path loss or a distance between the first UE and the second UE, and determine whether the second UE can share a TA value and/or a transmission power value with the first UE according to the path loss or the distance; or the first sending apparatus 401 is configured to report the path loss or the distance for determining whether the second UE can share the TA value and/or the transmission power value with the first UE to the base station.

According to an embodiment, the first receiving apparatus 402 is further configured to receive an RRC connection setup message from the base station, where the RRC connection setup message carries the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identity.

According to one embodiment, the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmission power value information of the second UE; the first sending device 401 is further configured to send, to the second UE, the D2D link configuration parameter of the second UE, and the TA value and/or the transmission power value information of the second UE.

According to one embodiment, the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or a transmission power value with the first UE; the first sending device 401 is further configured to send, to the second UE, the D2D link configuration parameter of the second UE, and the shared TA value and/or the transmit power value.

According to one embodiment, the first user equipment further comprises: a first temporary identifier obtaining device 405, configured to obtain a D2D cell radio network temporary identifier D2D-C-RNTI allocated by a base station, where the D2D-C-RNTI is used for a first UE and a second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and the first receiving apparatus 402 is configured to use the D2D-C-RNTI to descramble the PDCCH, which is a physical downlink control channel, to obtain scheduling information of the D2D link configuration parameters of the first UE sent by the base station, and further obtain the D2D link configuration parameters of the first UE according to the scheduling information.

According to an embodiment of the present invention, a second user equipment, UE, is provided. Fig. 5 shows a schematic block diagram of a second UE according to an embodiment of the present invention. It can be seen that the second user equipment UE 50 comprises: a second receiving device 502, configured to receive a paging message from a base station from the base station, and obtain a D2D link configuration parameter of a second UE based on the paging message; second connection establishing means 503 for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

According to one embodiment, the second user equipment further comprises: a second temporary identifier obtaining device 505, configured to obtain a D2D cell radio network temporary identifier D2D-C-RNTI carried in the paging message, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and the second receiving apparatus 502 is configured to use the D2D-C-RNTI to descramble the PDCCH, which is a physical downlink control channel, to obtain scheduling information of the D2D link configuration parameters of the second UE sent by the base station, and further obtain the D2D link configuration parameters of the second UE according to the scheduling information.

According to an embodiment of the present invention, a second user equipment, UE, is provided. Fig. 6 shows a schematic block diagram of a second UE according to an embodiment of the present invention. As can be seen, the second user equipment UE 60 includes: third receiving means 602, configured to receive the D2D link configuration parameter and the RRC connection configuration parameter of the second UE forwarded by the first UE from the base station; third connection establishing means 603, configured to establish a D2D connection with the first UE based on the D2D link configuration parameters of the second UE, and complete RRC connection establishment with a base station based on the RRC connection configuration parameters.

According to an embodiment, the third receiving means 602 is further configured to obtain a timing advance TA value and/or a transmission power value of the second UE from the first UE.

According to one embodiment, the second user equipment UE further comprises: and a third temporary identifier obtaining device 605, configured to receive a D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

According to one embodiment of the present invention, a base station is provided. Fig. 7 shows a schematic block diagram of a base station according to an embodiment of the present invention. As can be seen, the base station 70 includes: a fourth receiving means 702, configured to receive a preamble from the first UE, and configured to receive a second UE identity from the first UE; a fourth sending device 701, configured to send a random access response message to the first UE in response to the preamble, and send a D2D link configuration parameter of the first UE to the first UE based on the second UE identity, where the D2D link configuration parameter of the first UE is used for the connection between the first UE and the D2D of the second UE.

According to one embodiment, the fourth sending apparatus 701 further sends a paging message to the second UE, where the paging message is used to indicate the D2D link configuration parameters of the second UE.

According to one embodiment, the base station 70 further includes a scrambling device 703 for scrambling the physical downlink control channel PDCCH by the D2D cell radio network temporary identity D2D-C-RNTI to transmit scheduling information of the D2D link configuration parameters of the first UE and the second UE to the first UE and the second UE.

In addition, an embodiment of the present invention further provides a communication system, including the first user equipment, the second user equipment, and the base station.

In the embodiments of the system and the UE, the first UE is identical to the first UE in the corresponding method embodiment, and the second UE is identical to the second UE in the corresponding method embodiment, and technical implementation details in each module are the same as those in the corresponding method embodiment, and are not described again.

Those skilled in the art should understand that the device modules in the embodiments of the present invention are divided into functional partitions, and the actual specific structure may be a split or a merge of the above functional modules.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

The embodiments of the present invention are also within the scope of the claims.

It will be understood by those skilled in the art that all or part of the processing in the method of the above embodiments may be implemented by hardware that is instructed to be associated with a program, and the program may be stored in a computer-readable storage medium.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement 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 for establishing a connection from a device to a device D2D terminal, comprising:

the first user equipment UE sends a preamble to a base station;

the first UE receives a random access response message sent by the base station in response to the preamble;

the first UE sends a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE;

the first UE receives the D2D link configuration parameters and the RRC connection configuration parameters of the first UE, which are returned by the base station in response to the second UE identification;

the first UE establishes a D2D connection with the second UE based on the D2D link configuration parameters of the first UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters;

the first UE sending the second UE identity to the base station includes: the first UE sends an RRC connection establishment request message to the base station, wherein the RRC connection establishment request message carries the second UE identification;

the method further comprises the following steps:

the first UE detects the second UE to acquire the path loss or the distance between the first UE and the second UE;

the first UE determines that the second UE can share a TA value and/or a transmission power value with the first UE according to the path loss or the distance; the RRC connection establishment request message further carries indication information indicating that the first UE and the second UE share a timing advance TA value and/or a transmission power value; or

The first UE reports to the base station said path loss or distance for determining whether the second UE is able to share the TA value and/or the transmit power value with the first UE.

2. The method of claim 1, wherein the receiving, by the base station, the returned D2D link configuration parameters for the first UE in response to the second UE identification comprises:

and receiving an RRC connection establishment message from a base station, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identification.

3. The method of claim 2, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmission power value information of the second UE;

the method further comprises the following steps:

the first UE sends the D2D link configuration parameters of the second UE and the TA value and/or the transmission power value information of the second UE to the second UE.

4. The method of claim 3, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or a transmission power value with the first UE;

the method further comprises the following steps:

the first UE sends the second UE's D2D link configuration parameters, along with the shared TA value and/or transmit power value, to the second UE.

5. The method of any one of claims 1-4, further comprising:

the method comprises the steps that a first UE obtains a D2D cell radio network temporary identifier D2D-C-RNTI allocated by a base station, and the D2D-C-RNTI is used for the first UE and a second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH;

the receiving the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identity comprises:

the first UE uses the D2D-C-RNTI to descramble a physical downlink control channel PDCCH to obtain scheduling information of the D2D link configuration parameters of the first UE sent by the base station, and further obtains the D2D link configuration parameters of the first UE according to the scheduling information.

6. The method of claim 5, wherein the first UE obtaining the base station allocated D2D cell radio network temporary identity D2D-C-RNTI comprises: and the first UE acquires the D2D-C-RNTI carried in the random access response message.

7. A method for establishing a connection from a device to a device D2D terminal, comprising:

the second User Equipment (UE) receives a paging message from the base station and acquires the D2D link configuration parameters of the second UE based on the paging message;

the second UE establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE;

the paging message also carries a TA value and/or a transmission power value of the second UE; or

The paging message further indicates that the first UE and the second UE share a Timing Advance (TA) value and/or a transmission power value, and the method further includes: the second UE uses the TA value and/or the transmission power value shared with the first UE as the TA value and/or the transmission power value of the second UE.

8. The method of claim 7, wherein the obtaining the D2D link configuration parameters for the second UE based on the paging message comprises:

and acquiring the D2D link configuration parameters of the second UE carried by the paging message.

9. The method of claim 7, wherein the obtaining the D2D link configuration parameters for the second UE based on the paging message comprises:

acquiring a D2D cell radio network temporary identifier D2D-C-RNTI carried by a paging message, wherein the D2D-C-RNTI is used for acquiring scheduling information of first UE and second UE from a Physical Downlink Control Channel (PDCCH) by the first UE and the second UE;

and descrambling a Physical Downlink Control Channel (PDCCH) by using the D2D-C-RNTI to obtain scheduling information of the D2D link configuration parameters of the second UE sent by the base station, and further obtaining the D2D link configuration parameters of the second UE according to the scheduling information.

10. A method for establishing a connection from a device to a device D2D terminal, comprising:

the second User Equipment (UE) receives the D2D link configuration parameters and the RRC connection configuration parameters of the second UE, which are forwarded by the first UE from the base station;

the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters;

the method further comprises the following steps: and the second UE acquires the TA value and/or the transmission power value of the second UE from the first UE.

11. The method of claim 10, further comprising:

and the second UE receives the D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, wherein the D2D-C-RNTI is used for the first UE and the second UE to acquire scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

12. A method for establishing a connection from a device to a device D2D terminal, comprising:

receiving a preamble from a first UE;

responding to the preamble and sending a random access response message to the first UE;

receiving a second UE identity from a first User Equipment (UE);

transmitting, to a first UE, D2D link configuration parameters of the first UE based on the second UE identity, the D2D link configuration parameters of the first UE for D2D connectivity of the first UE with the second UE;

the receiving the second UE identity from the first UE comprises:

receiving an RRC connection establishment request message from a first UE, wherein the RRC connection establishment request message carries the second UE identification;

the RRC connection establishment request message also carries path loss or distance between the first UE and the second UE, or indication information indicating that the first UE and the second UE share a timing advance TA value and/or a transmission power value.

13. The method of claim 12, wherein sending the D2D link configuration parameters for the first UE to the first UE comprises:

sending an RRC connection establishment message to the first UE, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE.

14. The method of claim 12 or 13, further comprising:

and sending a paging message to the second UE, wherein the paging message is used for indicating the D2D link configuration parameters of the second UE.

15. The method of claim 14, wherein the paging message carries the D2D link configuration parameter of the second UE, and a TA value and/or a transmit power value of the second UE.

16. The method of claim 14, in which the paging message further indicates that the first UE and the second UE share a time advance, TA, value and/or a transmit power value.

17. The method of claim 12, wherein the sending the D2D link configuration parameters for the first UE to the first UE comprises: and sending scheduling information of the D2D link configuration parameters of the first UE and the second UE to the first UE and the second UE by scrambling a physical downlink control channel PDCCH through a D2D cell radio network temporary identifier D2D-C-RNTI.

18. A first User Equipment (UE), comprising:

the first sending device is used for sending a preamble to a base station and sending a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE;

a first receiving device, configured to receive a random access response message sent by the base station in response to the preamble, and configured to receive a D2D link configuration parameter and an RRC connection configuration parameter of the first UE, which are returned by the base station in response to the second UE identity; and

first connection establishing means for establishing a D2D connection with the second UE based on the D2D link configuration parameters of the first UE and completing RRC connection establishment with a base station based on the RRC connection configuration parameters;

the first receiving means is further for:

receiving an RRC connection establishment message from a base station, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identification;

the device further comprises:

the first sharing determination device is used for detecting the second UE to acquire the path loss or the distance between the first UE and the second UE, and determining whether the second UE can share the TA value and/or the transmission power value with the first UE according to the path loss or the distance; or

The first transmitting means is for reporting the path loss or distance for determining whether the second UE is capable of sharing the TA value and/or the transmit power value with the first UE to the base station.

19. The first user equipment of claim 18, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmission power value information of the second UE;

the first sending device is further configured to send, to the second UE, the D2D link configuration parameter of the second UE, and the TA value and/or the transmission power value information of the second UE.

20. The first user equipment of claim 18, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or a transmission power value with the first UE;

the first transmitting device is further configured to transmit, to the second UE, the D2D link configuration parameter of the second UE, and the shared TA value and/or the transmit power value.

21. The first user device of claim 18 or 19, further comprising:

the first temporary identifier obtaining device is used for obtaining a D2D cell radio network temporary identifier D2D-C-RNTI allocated by a base station, and the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and is

The first receiving device is configured to use the D2D-C-RNTI to descramble the PDCCH, which is a physical downlink control channel, to obtain scheduling information of the D2D link configuration parameters of the first UE sent by the base station, and further obtain the D2D link configuration parameters of the first UE according to the scheduling information.

22. A second user equipment, UE, comprising:

the second receiving device is used for receiving the paging message from the base station and acquiring the D2D link configuration parameters of the second UE based on the paging message;

second connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE;

wherein,

And if the paging message further indicates that the first UE and the second UE share the TA value and/or the transmission power value, the TA value and/or the transmission power value shared with the first UE are/is used as the TA value and/or the transmission power value of the second UE.

23. The second user device of claim 22, further comprising:

a second temporary identifier obtaining device, configured to obtain a D2D cell radio network temporary identifier D2D-C-RNTI carried in the paging message, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and is

The second receiving device is configured to use the D2D-C-RNTI to descramble the PDCCH, to obtain scheduling information of the D2D link configuration parameters of the second UE sent by the base station, and further obtain the D2D link configuration parameters of the second UE according to the scheduling information.

24. A second user device, comprising:

third receiving means, configured to receive the D2D link configuration parameter and the RRC connection configuration parameter of the second UE forwarded by the first UE from the base station;

third connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE and completing RRC connection establishment with a base station based on the RRC connection configuration parameters;

the third receiving device is further configured to obtain a timing advance TA value and/or a transmission power value of the second UE from the first UE.

25. The second user device of claim 24, further comprising:

and a third temporary identifier obtaining device, configured to receive a D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

26. A base station, comprising:

a fourth receiving device, configured to receive the preamble from the first UE, and to receive the second UE identity from the first UE;

a fourth sending device, configured to send a random access response message to the first UE in response to the preamble, and send a D2D link configuration parameter of the first UE to the first UE based on the second UE identity, where the D2D link configuration parameter of the first UE is used for the D2D connection between the first UE and the second UE;

the fourth sending device also sends a paging message to the second UE, where the paging message is used to indicate the D2D link configuration parameters of the second UE;

wherein,

the receiving the second UE identity from the first UE comprises:

27. The base station according to claim 26, further comprising scrambling means for scrambling physical downlink control channel, PDCCH, with D2D cell radio network temporary identity, D2D-C-RNTI, to send scheduling information of D2D link configuration parameters of the first and second UEs to the first and second UEs.