WO2017201741A1 - 一种切换到中继节点的方法、相关设备及系统 - Google Patents

一种切换到中继节点的方法、相关设备及系统 Download PDF

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Publication number
WO2017201741A1
WO2017201741A1 PCT/CN2016/083698 CN2016083698W WO2017201741A1 WO 2017201741 A1 WO2017201741 A1 WO 2017201741A1 CN 2016083698 W CN2016083698 W CN 2016083698W WO 2017201741 A1 WO2017201741 A1 WO 2017201741A1
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WIPO (PCT)
Prior art keywords
terminal device
random access
message
information
carried
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PCT/CN2016/083698
Other languages
English (en)
French (fr)
Inventor
李国荣
王键
王达
坦尼⋅纳坦⋅爱德华
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680085484.1A priority Critical patent/CN109155958B/zh
Priority to PCT/CN2016/083698 priority patent/WO2017201741A1/zh
Priority to EP16902731.5A priority patent/EP3457761B1/en
Priority to US16/304,825 priority patent/US10764811B2/en
Publication of WO2017201741A1 publication Critical patent/WO2017201741A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, related device, and system for switching to a relay node.
  • the wearable device can directly communicate with the mobile communication network (Cellular network), and utilizes the data transmission service provided by the mobile communication network to present a rich application experience to the user.
  • the mobile communication network Cellular network
  • wearable devices are generally weak, and long-term connection to a mobile communication network (Cellular network) will obviously consume the power of the wearable device and affect the battery life.
  • wearable devices also need to use higher transmit power to ensure stable and reliable communication, which leads to less guaranteed standby time.
  • the embodiment of the invention provides a method, a related device and a system for switching to a relay node, which can switch the terminal device to the relay node as early as possible, and reduce the power consumption of the terminal device.
  • a method for switching to a relay node which is applied to a base station side, and includes:
  • the base station of the target cell sends the indication information to the terminal device by using the random access message, and is used to instruct the terminal device to report the candidate corresponding to the terminal device.
  • Information of the relay device
  • a second aspect provides a method for switching to a relay node, which is applied to a terminal device side, and includes:
  • the terminal device receives the target cell corresponding to The indication information sent by the base station by using the random access message; the indication information is used to notify the terminal device to report information of the candidate relay device corresponding to the terminal device;
  • the terminal device Sending, by the terminal device, the information of the candidate relay device to the base station, in response to the indication information, to enable the base station to determine a target relay node from the candidate relay device, and switch the terminal device Go to the target relay node.
  • the first aspect and the second aspect described above describe a method for switching to a relay node according to an embodiment of the present invention, and the method for switching to a relay node as early as possible is implemented by using the method.
  • the relay node reduces power consumption of the terminal device.
  • the indication information may be carried in at least one of the following messages: a random access response, or a contention resolution message.
  • the information of the candidate relay device may be carried in at least one of the following In the message: a random access message 3, an RRC connection setup complete message, or an uplink message after the RRC connection setup complete message;
  • the information of the candidate relay device may be carried in at least one of the following messages: an RRC connection setup complete message, or after the RRC connection setup complete message Upstream message.
  • the base station needs to know the device type of the terminal device before sending the indication information to the terminal device by using a random access message.
  • the base station sends the indication information to the terminal device through a random access message under the condition that the device type of the terminal device is a specified device type (for example, a wearable device).
  • the terminal device may indicate a device type of the terminal device by using a random preamble.
  • the base station can learn the device type of the terminal device by using a random preamble sent by the terminal device.
  • the terminal device may indicate, by using the message 3, a device type of the terminal device, where the message 3 carries the device of the terminal device. Type information.
  • the base station can learn the device type of the terminal device through the message 3.
  • the method for indicating a device type of the terminal device by using the random access preamble may include: indicating, by using a PRACH resource that carries the random access preamble, a device type of the terminal device.
  • the device type of the terminal device may be indicated by the format of the random access preamble, and the device type of the terminal device may be indicated by the group where the random access preamble is located.
  • the information of the candidate relay device may include at least one of the following: identifier information of the candidate relay device corresponding to the terminal device, and the terminal device Corresponding measurement result of the candidate relay device; or identification information of the relay device having a preset pairing relationship with the terminal device.
  • the measurement result of the candidate relay device may include: a signal strength between the candidate relay device and the terminal device, and a load capacity of the candidate relay device (eg, a data buffering capability, a remaining power, etc.) ), the current load amount of the candidate relay device, information security processing (encryption and decryption) capability, and the like.
  • a load capacity of the candidate relay device eg, a data buffering capability, a remaining power, etc.
  • the relay device having a preset pairing relationship with the terminal device may be a device that has established a communication connection with the terminal device in advance.
  • the terminal device is a smart bracelet of user A, and the smart bracelet is pre-bounded with the mobile phone of user A through Bluetooth. Then, the preset pairing relationship is established between the mobile phone and the smart bracelet.
  • the base station may preferentially select a relay device having a preset pairing relationship with the terminal device as a target relay node of the terminal device.
  • the terminal device may transmit information of the candidate relay device carried in the message 3 in the following two manners:
  • the information of the candidate relay device carried in the message 3 is transmitted by using the added information control unit, or utilized.
  • An added information control unit is used to indicate the device type of the terminal device.
  • the information of the candidate relay device or the device type information is added in an upper layer message (for example, RRC Connection Request) of the message 3.
  • an upper layer message for example, RRC Connection Request
  • the base station may add the indication information carried by a random access response (RAR) in a MAC RAR for the terminal device.
  • the base station may also use one or more information control units in the contention resolution message to utilize The added information control unit transmits the indication information carried in the contention resolution message.
  • the terminal device may transmit information of the candidate relay device carried in an RRC connection setup complete message in the following two manners:
  • one or more information control units are added to the RRC connection setup complete message, and the information of the candidate relay device carried in the RRC connection setup complete message is transmitted by using the added information control unit.
  • the information of the candidate relay device is added in an upper layer message of the RRC connection setup complete message.
  • a network device comprising means for performing the method of the first aspect.
  • a terminal device comprising means for performing the method of the second aspect.
  • a network device comprising: a memory and a processor, a transmitter and a receiver coupled to the memory, wherein: the transmitter is for transmitting data to the outside, and the receiver is for receiving an external The transmitted data, the memory for storing implementation code of the method described in the first aspect, the processor for executing program code stored in the memory, ie performing the method described in the first aspect.
  • a terminal device a memory, and a processor, a transmitter, and a receiver coupled to the memory, wherein: the transmitter is configured to transmit data to the outside, and the receiver is configured to receive an externally transmitted Data, the memory for storing implementation code of the method described in the second aspect, the processor for executing program code stored in the memory, ie performing the method described in the second aspect.
  • the seventh aspect provides a storage system, including: a network device and a terminal device, where: the network device may be the network device described in the foregoing third aspect, and the terminal device may be the foregoing fourth aspect.
  • the terminal device described may also be the network device described in the foregoing fifth aspect, and the terminal device may also be the terminal device described in the foregoing sixth aspect.
  • a storage medium for storing an implementation code of the method of the first aspect described above.
  • a storage medium for storing an implementation code of the method of the second aspect described above.
  • the base station of the target cell sends the indication information to the terminal device by using a random access message, and is used to indicate that the terminal device reports the location The information of the candidate relay device corresponding to the terminal device. And the base station determines the target relay node from the candidate relay device, and finally switches the terminal device to the target relay node, so that the terminal device (such as a wearable device) can be switched to the medium end as soon as possible. Following the node, the power consumption of the terminal device is reduced.
  • FIG. 1 is a schematic diagram of a relay communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a conventional wearable device reporting information of candidate relay devices
  • FIG. 3 is a schematic flowchart of a method for switching to a relay node according to an embodiment of the present invention
  • 4A-4B are schematic flowcharts of information reported by several major terminal devices for reporting candidate relay devices according to an embodiment of the present invention.
  • 5A-5C are schematic diagrams of several types of device indicating a random access preamble according to an embodiment of the present invention.
  • 6A is a schematic diagram of a data format of a MAC PDU according to an embodiment of the present invention.
  • FIG. 6B is a schematic diagram of a data format of a MAC RAR according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
  • a relay according to an embodiment of the present invention is first introduced. technology.
  • FIG. 1 is a schematic diagram of a relay communication system according to an embodiment of the present invention.
  • the relay technology is: one or more relay nodes are added between the base station and the terminal device, and the wireless signal is forwarded one or more times, that is, the wireless signal needs to go through multiple hops to reach the terminal. device.
  • a "base station-terminal" link is divided into two links: a "base station-relay node” and a "relay node-terminal”, so that a poor quality can be obtained.
  • the link is replaced by two better quality links for higher link capacity and better coverage.
  • the communication between the terminal device and the relay node belongs to Device to Device (D2D) communication, and the power consumed by data transmission between the two is low. That is to say, the terminal device communicates with the base station through the relay of the relay node, thereby reducing the transmission power during data transmission.
  • D2D Device to Device
  • the above terminal device may be a handheld device, a computing device, or the like having a wireless mobile communication function, such as a mobile phone, an in-vehicle device, a wearable device, and a terminal device in a future 5G network.
  • a wireless mobile communication function such as a mobile phone, an in-vehicle device, a wearable device, and a terminal device in a future 5G network.
  • the terminal device is a wearable device.
  • the base station can switch the communication link of the wearable device to the connectable relay device and pass the relay device.
  • the relay communicates with the wearable device.
  • FIG. 2 shows a method for reporting candidate relay device information by a wearable device.
  • the base station may indicate, by the RRC connection reconfiguration (Reconfiguration) message, that the wearable device reports the measurement result of the candidate relay device by using the RRC connection reconfiguration (Reconfiguration) message.
  • the wearable device sends the measurement result of the candidate relay device to the base station in response to the indication, so that the base station selects one relay device from the candidate relay device for the wearable device according to the measurement result, and the wearable device The communication link is switched to this relay device.
  • the base station and the wearable device need to use the newly established RRC connection for data transmission. Since the wearable device has not been switched to the relay device at this time, the data at this time is The transmission needs to consume a large amount of power.
  • the present invention provides a method, a related device, and a system for switching to a relay node, which can be implemented to switch a terminal device (such as a wearable device) to a relay node as soon as possible, and reduce the terminal.
  • a terminal device such as a wearable device
  • the power consumption of the device The details are described below separately.
  • FIG. 3 is a schematic flowchart of a method for switching to a relay node according to an embodiment of the present invention. As shown in FIG. 3, the method includes:
  • the base station of the target cell sends the indication information to the terminal device by using the random access message to indicate that the terminal device reports the terminal device corresponding to the target device.
  • Information about candidate relay devices
  • the terminal device is in an RRC idle state (RRC_IDLE) before the initial random access. After the initial random access procedure, the terminal device may transit from the RRC idle state (RRC_IDLE) to the RRC connected state (RRC_CONNECTED).
  • the terminal device receives the indication information sent by the base station. And, the terminal device sends the information of the candidate relay device to the base station in response to the indication information.
  • the candidate relay device may be a device that has a device to device (D2D) communication connection with the terminal device.
  • the D2D communication connection may be: Wi-Fi (Wireless Fidelity), Bluetooth, Zigbee, and Long Term Evolution (LTE) based D2D communication connection and the like.
  • the terminal device may correspond to two (or more) candidate relay devices, or may only correspond to one candidate relay device, which is not limited herein.
  • the information of the candidate relay device may include at least one of the following: the identifier information of the candidate relay device corresponding to the terminal device, and the measurement result of the candidate relay device corresponding to the terminal device. Or, the identification information of the relay device having a preset pairing relationship with the terminal device.
  • the measurement result of the candidate relay device may include: a signal strength between the candidate relay device and the terminal device, and a load capacity of the candidate relay device (eg, data buffering) Capacity, remaining power, etc.), current load amount of the candidate relay device, information security processing (encryption and decryption) capability, and the like.
  • the base station may select an optimal or better relay device for the terminal device according to the measurement result, and use the selected relay device as the target relay node of the terminal device.
  • the relay device having a preset pairing relationship with the terminal device may be a device that has established a communication connection with the terminal device in advance.
  • the terminal device is used User A's smart bracelet, which is pre-bound with User A's mobile phone via Bluetooth. Then, the preset pairing relationship is established between the mobile phone and the smart bracelet.
  • the base station may preferentially select a relay device having a preset pairing relationship with the terminal device as a target relay node of the terminal device.
  • the identifier information of the relay device may be a Radio Network Temporary Identity (RNTI) of the relay device, or may be a MAC address of the relay device, or may be another base station.
  • RNTI Radio Network Temporary Identity
  • the identification information of the relay device is identified, and no limitation is made here.
  • the base station receives information about the candidate relay device that is sent by the terminal device. And, the base station determines, from the candidate relay device, a target relay node used for relay communication between the terminal device and the base station according to the information of the candidate relay device.
  • the base station switches the terminal device to the target relay node.
  • the initial random access procedure is a contention based random access procedure
  • the random access message involved in the initial random access procedure includes:
  • Random access preamble also known as message 1 (referred to as Msg1).
  • Msg1 Random access preamble
  • the random access preamble is sent by the terminal device to the base station for requesting uplink synchronization.
  • Random Access Response also known as Message 2 (referred to as Msg2).
  • Msg2 Random Access Response
  • message 3 is sent by the terminal device to the base station.
  • message 3 contains an RRC Connection Request.
  • Contention Resolution also known as Message 4 (Msg4 for short).
  • the contention resolution message is sent by the base station to the terminal device. If the terminal device receives the contention resolution related to the user identity of the terminal device, and considers that the random access is successful, the terminal device changes from the RRC idle state to the RRC connection state, and the random access process is completed.
  • RRC connection setup complete message also known as message 5 (referred to as Msg5).
  • the RRC connection setup complete message is sent by the terminal device to the base station, and the RRC connection setup process is completed.
  • the base station can switch the terminal device (such as the wearable device) to the relay node as soon as possible, thereby reducing the location.
  • the power consumption of the terminal device An embodiment of reporting information of a candidate relay device by several major terminal devices according to an embodiment of the present invention is described below with reference to FIG. 4A-4B.
  • the indication information sent by the base station to the terminal device may be carried in a random access response (RAR) (ie, message 2). That is to say, the base station can use the first downlink random access message in the initial random access procedure to instruct the terminal device to report the information of the candidate relay device.
  • RAR random access response
  • the terminal device may carry the information of the candidate relay device in at least one of the following uplink messages: message 3, an RRC connection setup complete message (ie, a message) 5) or an uplink message after the RRC connection setup complete message.
  • the terminal device may select, according to actual needs, which one or more kinds of uplink messages carry the information of the candidate relay device.
  • the message 3 is the first uplink random access message after the RAR
  • the information of the candidate relay device is reported by the message 3, so that the base station can switch the terminal device to the relay device as soon as possible.
  • the information of the candidate relay device may be selected to be transmitted in the message 5 in which the reserved data bits are relatively large (compared to the message 3).
  • the terminal device may use the message 3, the RRC connection setup complete message (ie, message 5) or the uplink message after the RRC connection setup complete message.
  • the message 3 the RRC connection setup complete message (ie, message 5) or the uplink message after the RRC connection setup complete message.
  • Two or more types of information of the candidate relay device are transmitted to the base station. That is to say, the terminal device can ensure that the base station can successfully receive the information of the candidate relay device by repeatedly transmitting the information of the candidate relay device, and finally successfully perform relay switching.
  • the base station may repeatedly transmit the indication information in a contention resolution message. That is to say, the indication information may also be carried in the random access response and the contention resolution message, which may compensate for the loss of the indication information that may occur.
  • the base station Before the base station sends the indication information to the terminal device by using a random access response, the base station needs to know the device type of the terminal device.
  • the base station sends the indication information to the terminal device through a random access response under the condition that the device type of the terminal device is a specified device type (for example, a wearable device).
  • the device of the specified device type refers to a device whose own power storage capability is weak and cannot support independent communication with the base station for a long time, and such device usually needs to utilize the candidate relay device (storage capability) A relatively strong transfer to maintain communication with the base station for a longer period of time.
  • the device of the specified device type may be: a wearable device with a weak storage capacity (for example, less than 1000 mAh), a wireless communication device such as a M2M (Machine to Machine) device, a mobile phone, or the like, or may be: A wireless communication device that maintains a communication connection state with a standby time lower than 50% of the standby time of an ordinary smartphone.
  • M2M Machine to Machine
  • the terminal device may indicate the device type of the terminal device by using a random preamble.
  • the terminal device can indicate its own device type in the following manners:
  • the device type of the terminal device may be indicated by a physical random access channel (PRACH) resource that carries the random access preamble.
  • PRACH physical random access channel
  • Figure 5A shows PRACH resources (including “1", “2” and “3" in the drawing) carrying a random access preamble.
  • the indication meaning of the preamble can be distinguished by distinguishing resources that carry the preamble.
  • the random access preamble carried on the PRACH resource selected by the dotted circle is a special preamble, indicating that the terminal device that sends the random access preamble is the device of the specified type (for example, Wearable device).
  • the examples are merely illustrative of the embodiments of the invention and should not be construed as limiting.
  • the base station may learn the device type of the terminal device by using the PRACH resource that carries the random access preamble.
  • the device type of the terminal device may be indicated by a format of the random access preamble.
  • the random access preamble has five formats.
  • the preamble format 0 occupies 1 subframe
  • the preamble format 1 and the preamble format 2 occupy 2 subframes
  • the preamble format 3 occupies 3 subframes.
  • the preamble format 4 can only be used in an Uplink Pilot Time Slot (UpPTS).
  • UpPTS Uplink Pilot Time Slot
  • the indication meaning of the random access preamble can be distinguished by distinguishing the preamble format of the random access preamble.
  • the random access preamble of the preamble format 0 is a special preamble, indicating that the terminal device that transmits the random access preamble is the device of the specified type (for example, a wearable device).
  • the specified type for example, a wearable device.
  • the base station may learn the end through the format of the random access preamble.
  • the device type of the end device may be learned from the base station.
  • the device type of the terminal device is indicated by a group in which the random access preamble is located.
  • group A there are 64 available preambles in a cell.
  • these preambles have been divided into two groups: group A (group A) and group B (group B).
  • group A group A
  • group B group B
  • the indication meaning of the random access preamble can be distinguished by distinguishing the group in which the random access preamble is located.
  • the random access preamble selected by the dotted circle is divided into a special preamble group, and the terminal device that transmits the random access preamble in the special group is the device of the specified type (for example, Wearable device).
  • the examples are merely illustrative of the embodiments of the invention and should not be construed as limiting.
  • the base station can learn the device type of the terminal device by using the group in which the random access preamble is located.
  • the indication information sent by the base station to the terminal device may be carried in a Contention Resolution (ie, Message 4). That is to say, the base station can use the second downlink random access message in the initial random access procedure to instruct the terminal device to report the information of the candidate relay device.
  • the terminal device may carry information of the candidate relay device in at least one of the following uplink messages: an RRC connection setup complete message (ie, message 5) or RRC The upstream message after the connection establishment completion message.
  • the terminal device may select to carry the one or two uplink messages in the uplink message after the RRC connection setup complete message and the RRC connection setup complete message according to actual requirements.
  • Information about candidate relay devices For details, refer to related content in the implementation manner of FIG. 4A, and details are not described herein again.
  • the base station Before the base station sends the indication information to the terminal device by using a contention resolution message, the base station needs to know the device type of the terminal device.
  • the base station sends the indication information to the terminal device through a contention resolution message under the condition that the device type of the terminal device is a specified device type (for example, a wearable device).
  • a specified device type for example, a wearable device.
  • the terminal device may indicate the device type of the terminal device by using a random preamble.
  • the device type indicating the terminal device by using a preamble please refer to the related content in the embodiment of FIG. 4A. I won't go into details here.
  • the terminal device may further indicate the device type of the terminal device by using the message 3. That is, the information of the device type of the terminal device may be carried in the message 3.
  • the base station can learn the device type of the terminal device through the message 3.
  • the random access messages involved in the random access procedure are substantially all MAC Access Data Units (MAC PDUs) (media access control, English: Media Access Control (MAC).
  • MAC PDUs MAC Access Data Units
  • MAC Media Access Control
  • FIG. 6A shows MAC PDUs of an uplink and downlink random access message (except for a random access response RAR).
  • the MAC PDU includes: a MAC header, zero or more Service Data Units (SDUs), zero or more information control elements, and possibly There is padding.
  • SDUs Service Data Units
  • one MAC header may have one or more subheaders, and one subheader consists of six domains (R/R/E/LCID/F/L) or four domains (R/R/E/). LCID) composition.
  • the specific manner in which the message 3 carries the information of the candidate relay device may be as follows:
  • the terminal device may use the added information control unit to transmit the candidate carried in the message 3 by adding one or more information control units (generated by the MAC layer) in the message 3. Following the information of the device, or using an added information control unit to indicate the device type of the terminal device.
  • the terminal device may transmit, by using one or more SDUs (generated by an upper layer) in the message 3, information of the candidate relay device carried in the message 3, or utilize The one or more SDUs indicate a device type of the terminal device. Since the SDU is from an upper layer (for example, an RRC layer), the terminal device may add information of the candidate relay device or the device type information in an upper layer message (for example, RRC Connection Request) of the message 3.
  • an upper layer for example, an RRC layer
  • the base station may add one or more information control units in the contention resolution message, and transmit the indication carried in the contention resolution message by using the added information control unit. information.
  • the base station may also add the indication information in a contention resolution message upper layer message (eg, RRC Connection Setup).
  • the terminal device can pass One or more information control units are added to the RRC connection setup complete message, and the information of the candidate relay device carried in the RRC connection setup complete message is transmitted by using the added information control unit.
  • the terminal device may also add information of the candidate relay device in an upper layer message of the RRC connection setup complete message.
  • FIG. 6B shows a MAC RAR (Random Access Response). As shown in FIG. 6B, the following fields are included: a reserved bit R, a Timing Advance Command, an Uplink Grant (UL Grant), and a Temporary C-RNTI field (Temporary C-) RNTI) (C-RNTI: Cell Radio Network Temporary Identify, Chinese: Cellular Radio Network Temporary Identity).
  • the base station may add the indication information carried by a random access response (RAR) in a MAC RAR for the terminal device. Specifically, the base station may use the reserved bit R to send the indication information, and instruct the terminal device to report information of the candidate relay device.
  • RAR random access response
  • the base station of the target cell when the terminal device initiates an initial random access procedure for the target cell, the base station of the target cell sends the indication information to the terminal device by using a random access message, and is used to indicate the terminal device.
  • the information of the candidate relay device corresponding to the terminal device is reported.
  • the base station determines the target relay node from the candidate relay device, and finally switches the terminal device to the target relay node, so that the terminal device (such as a wearable device) can be switched to the medium end as soon as possible. Following the node, the power consumption of the terminal device is reduced.
  • an embodiment of the present invention further provides a device (shown in FIG. 7) for implementing the method described in the foregoing embodiment of FIG. 3.
  • the apparatus 70 includes a transmitter 703, a receiver 704, a memory 702, and a processor 701 coupled to the memory 702 (the number of the processors 701 may be one or more, and one processor in FIG. 7 is example).
  • the transmitter 703, the receiver 704, the memory 702, and the processor 701 may be connected by a bus or the like (in FIG. 7, for example, by a bus connection).
  • the transmitter 703 is for transmitting data to the outside
  • the receiver 704 is for receiving data from the outside.
  • the memory 702 is used to store program code
  • the processor 701 is used to call and run program code stored in the memory 702.
  • the program code stored in the memory 702 is specifically used to implement the functions of the base station in the embodiment of FIG.
  • the processor 701 is configured to call the process stored in the memory 702. Order the code and perform the following steps:
  • the transmitter 703 sends the indication information to the terminal device by using the random access message, and is used to instruct the terminal device to report the candidate relay corresponding to the terminal device.
  • Equipment information
  • the indication information may be carried in at least one of the following messages: a random access response, a contention resolution message.
  • the information of the candidate relay device may be carried in the following In at least one message: a random access message 3, an RRC connection setup complete message, or an uplink message after the RRC connection setup complete message.
  • the information of the candidate relay device may be carried in at least one of the following messages: an RRC connection setup complete message, or the RRC connection setup.
  • the processor 701 is further configured to learn, by using a random access preamble received by the receiver 704.
  • the device type of the terminal device is not limited to the following devices:
  • the processor 701 may be configured to: learn, by using a PRACH resource that carries the random access preamble, a device type of the terminal device; or obtain, by using a format of the random access preamble, a device of the terminal device. Or; the device type of the terminal device is learned by the group in which the random access preamble is located.
  • the content in the embodiment of FIG. 3 may be specifically referred to, and details are not described herein.
  • the processor 701 is further configured to learn, by using the message 3 received by the receiver 704, a device type of the terminal device, where the The message type information of the terminal device is carried in the message 3.
  • the execution steps of the processor 701 and other technical features involved in the processor 701 may also refer to related content of the base station in the method embodiment of FIG. 3, and details are not described herein again.
  • the program code stored in the memory 702 is specifically used to implement the functions of the terminal device in the embodiment of FIG. 3.
  • the processor 701 is configured to call the program code stored in the memory 702, and perform the following steps:
  • the receiver In the initial random access process for the target cell, the receiver is used to receive indication information that is sent by the base station corresponding to the target cell by using a random access message; the indication information is used to notify the terminal device to report the terminal. Information about the candidate relay device corresponding to the device;
  • the indication information may be carried in at least one of the following messages: a random access response, or a contention resolution message.
  • the information of the candidate relay device may be carried in the following In at least one message: a random access message 3, an RRC connection setup complete message, or an uplink message after the RRC connection setup complete message.
  • the information of the candidate relay device may be carried in at least one of the following messages: an RRC connection setup complete message, or the RRC connection setup.
  • the processor 701 is further configured to use a random access preamble sent by the transmitter. Indicates the device type of the terminal device.
  • the processor 701 is specifically configured to: pass the PRACH that carries the random access preamble
  • the resource indicates the device type of the terminal device; or the device type of the terminal device is indicated by a preamble format of the random access preamble; or the terminal is indicated by the group where the random access preamble is located
  • the device type of the device For details about the implementation of the terminal device type by using the random access preamble, the content in the embodiment of FIG. 3 may be specifically referred to, and details are not described herein.
  • the processor 701 is further configured to indicate, by using the message 3 sent by the transmitter, a device type of the terminal device, where the message 3 The device type information of the terminal device is carried in the device.
  • the execution steps of the processor 701 and other technical features involved in the processor 701 may refer to the related content of the terminal device in the method embodiment of FIG. 3, and details are not described herein again.
  • the embodiment of the present invention further provides a network device (shown in FIG. 8) and a terminal device (shown in FIG. 9), which are used to perform the handover to the relay node described in the foregoing FIG. 3 embodiment. Methods.
  • the network device 80 may include a transmitting unit 801, a receiving unit 803, a determining unit 805, and a relay switching unit 807. among them:
  • the sending unit 801 is configured to: when the terminal device initiates an initial random access procedure for the target cell, the base station of the target cell sends the indication information to the terminal device by using a random access message, where the terminal device reports the Information of the candidate relay device corresponding to the terminal device;
  • the receiving unit 803 is configured to receive information about the candidate relay device reported by the terminal device;
  • the determining unit 805 is configured to determine, from the candidate relay device, a target relay node for performing relay communication between the terminal device and the base station according to the information of the candidate relay device;
  • the relay switching unit 807 is configured to switch the terminal device to the target relay node.
  • the terminal device 90 may include a receiving unit 901 and a transmitting unit 903. among them:
  • the receiving unit 901 is configured to receive the target in an initial random access procedure for the target cell.
  • the sending unit 903 is configured to send information about the candidate relay device to the base station in response to the indication information, so that the base station determines a target relay node from the candidate relay device, and the terminal device Switch to the target relay node.
  • an embodiment of the present invention further provides a communication system, where the communication system includes: a network device and a terminal device.
  • the network device and the terminal device respectively correspond to the base station and the terminal device in the method embodiment of FIG.
  • the network device may be a network device characterized by the device shown in FIG. 7, or may be a terminal device characterized by the device shown in FIG.
  • the network device shown may also be the network device 80 shown in FIG. 8, and the terminal device shown may also be the terminal device 90 shown in FIG.
  • the base station of the target cell sends the indication information to the terminal device by using a random access message, and is used to indicate that the terminal device reports the location The information of the candidate relay device corresponding to the terminal device. And the base station determines the target relay node from the candidate relay device, and finally switches the terminal device to the target relay node, so that the terminal device (such as a wearable device) can be switched to the medium end as soon as possible. Following the node, the power consumption of the terminal device is reduced.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明实施例公开一种切换到中继节点的方法、相关设备及系统。该方法包括：在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；接收所述终端设备上报的所述候选中继设备的信息；根据所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；将所述终端设备切换到所述目标中继节点。上述方案可实现尽早将终端设备切换到中继节点，降低所述终端设备的耗电。

Description

一种切换到中继节点的方法、相关设备及系统 技术领域
本发明涉及通信技术领域，尤其涉及一种切换到中继节点的方法、相关设备及系统。
背景技术
现今，可穿戴设备(Wearable Device，WD)已经被广泛应用于即时通信、运动记录、健康护理、定位等方面，极大的方便了人们的生活。可穿戴设备可以直接与移动通信网络(Cellular network)进行通信，利用移动通信网络提供的数据传输服务为用户呈现丰富的应用体验。
但是，可穿戴设备的电量储备能力一般较弱，长时间连接移动通信网络(Cellular network)会明显消耗掉可穿戴设备的电量，影响续航时间。尤其是在复杂的通信环境中，可穿戴设备还需要使用更高的发射功率以保证通信稳定可靠，这样导致待机时间更加得不到保障。
发明内容
本发明实施例提供了一种切换到中继节点的方法、相关设备及系统，可实现尽早将终端设备切换到中继节点，降低所述终端设备的耗电。
第一方面，提供了一种切换到中继节点的方法，应用于基站侧，包括：
在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；
接收所述终端设备上报的所述候选中继设备的信息；
根据所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；
将所述终端设备切换到所述目标中继节点。
第二方面，提供了一种切换到中继节点的方法，应用于终端设备侧，包括：
在针对目标小区的初始随机接入过程中，终端设备接收所述目标小区对应 的基站通过随机接入消息发送的指示信息；所述指示信息用于通知所述终端设备上报所述终端设备对应的候选中继设备的信息；
所述终端设备响应所述指示信息，将所述候选中继设备的信息发送给所述基站，以使基站从所述候选中继设备中确定出目标中继节点，并将所述终端设备切换到所述目标中继节点。
上述第一方面与上述第二方面分别从基站侧和终端设备侧描述了本发明实施例提供的一种切换到中继节点的方法，通过实施该方法，可实现尽早将所述终端设备切换到中继节点，降低所述终端设备的耗电。
结合第一方面或第二方面，在一些可能的实现方式中，所述指示信息可以被携带在以下至少一种消息中：随机接入响应，或者竞争解决消息。
如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息；
如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
结合第一方面或第二方面，在一些可能的实现方式中，所述基站在通过随机接入消息向所述终端设备发送所述指示信息之前，需要获知所述终端设备的设备类型。在获知所述终端设备的设备类型是指定设备类型(例如可穿戴设备)的条件下，所述基站才会通过随机接入消息向所述终端设备发送所述指示信息。
具体的，如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，所述终端设备可以通过随机前导码来指示所述终端设备的设备类型。相应的，所述基站可以通过所述终端设备发送的随机前导码来获知所述终端设备的设备类型。
具体的，如果所述指示信息被携带在所述竞争解决消息里，则所述终端设备可以通过消息3指示所述终端设备的设备类型，其中，所述消息3中携带所述终端设备的设备类型信息。相应的，所述基站可以通过消息3获知所述终端设备的设备类型。
在一些可能的实现方式中，通过所述随机接入前导码指示所述终端设备的设备类型的方法可包括：可以通过承载所述随机接入前导码的PRACH资源指示所述终端设备的设备类型，也可以通过所述随机接入前导码的格式指示所述终端设备的设备类型，还可以通过所述随机接入前导码所在的组指示所述终端设备的设备类型。
结合第一方面或第二方面，在一些可能的实现方式中，所述候选中继设备的信息可包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对应的所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
具体的，所述候选中继设备的测量结果可包括：所述候选中继设备与所述终端设备之间的信号强度、所述候选中继设备的负载能力(例如数据缓冲能力、剩余电量等)、所述候选中继设备的当前负载量、信息安全处理(加解密)能力等等。
具体的，与所述终端设备具有预设配对关系的中继设备可以是与所述终端设备预先建立了通信连接的设备。例如，所述终端设备是用户A的智能手环，该智能手环与用户A的手机通过蓝牙预先绑定。那么，该手机与该智能手环之间即具有所述预设配对关系。
实际应用中，考虑到用户数据的安全，基站可以优先选择与所述终端设备具有预设配对关系的中继设备作为所述终端设备的目标中继节点。
结合第一方面或第二方面，在一些可能的实现方式中，所述终端设备可以通过以下两种方式传输所述消息3中携带的所述候选中继设备的信息：
在第一种方式中，通过在消息3中增加一个或多个信息控制单元(由MAC层产生)，利用增加的信息控制单元传输消息3中携带的所述候选中继设备的信息，或者利用增加的信息控制单元来指示所述终端设备的设备类型。
在第二种方式中，在消息3的上层消息(例如RRC Connection Request)中添加所述候选中继设备的信息或者所述设备类型信息。
结合第一方面或第二方面，在一些可能的实现方式中，所述基站可以在针对所述终端设备的MAC RAR中增加随机接入响应(RAR)携带的所述指示信息。所述基站也可以通过竞争解决消息中增加一个或多个信息控制单元，利用 增加的信息控制单元传输竞争解决消息中携带的所述指示信息。
结合第一方面或第二方面，在一些可能的实现方式中，所述终端设备可以通过以下两种方式传输RRC连接建立完成消息中携带的所述候选中继设备的信息：
在第一种方式中，在RRC连接建立完成消息中增加一个或多个信息控制单元，利用增加的信息控制单元传输RRC连接建立完成消息中携带的所述候选中继设备的信息。
在第二种方式中，在RRC连接建立完成消息的上层消息中添加所述候选中继设备的信息。
第三方面，提供了一种网络设备，包括用于执行第一方面所述的方法的单元。
第四方面，提供了一种终端设备，包括用于执行第二方面所述的方法的单元。
第五方面，提供了一种网络设备，包括：存储器以及与所述存储器耦合的处理器、发射器和接收器，其中：所述发射器用于与向外部发送数据，所述接收器用于接收外部发送的数据，所述存储器用于存储第一方面描述的方法的实现代码，所述处理器用于执行所述存储器中存储的程序代码，即执行第一方面描述的方法。
第六方面，提供了一种终端设备，存储器以及与所述存储器耦合的处理器、发射器和接收器，其中：所述发射器用于与向外部发送数据，所述接收器用于接收外部发送的数据，所述存储器用于存储第二方面描述的方法的实现代码，所述处理器用于执行所述存储器中存储的程序代码，即执行第二方面描述的方法。
第七方面，提供了一种存储系统，包括：网络设备和终端设备，其中：所述网络设备可以是上述第三方面内容所述的网络设备，所述终端设备可以是上述第四方面内容所述的终端设备。所述网络设备也可以是上述第五方面内容所述的网络设备，所述终端设备也可以是上述第六方面内容所述的终端设备。
第八方面，提供了一种存储介质，用于存储上述第一方面所述的方法的实现代码。
第九方面，提供了一种存储介质，用于存储上述第二方面所述的方法的实现代码。
实施本发明实施例，在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息。并且，所述基站从所述候选中继设备中确定出目标中继节点，最后将所述终端设备切换到所述目标中继节点，可实现尽早将终端设备(如可穿戴设备)切换到中继节点，降低所述终端设备的耗电。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍。
图1是本发明实施例涉及的中继通信系统的示意图；
图2是现有的一种可穿戴设备上报候选中继设备信息的流程示意图；
图3是本发明实施例提供的切换到中继节点的方法的流程示意图；
图4A-4B是本发明实施例提供的几种主要的终端设备上报候选中继设备的信息的流程示意图；
图5A-5C是本发明实施例提供的几种利用随机接入前导码指示设备类型的示意图；
图6A是本发明实施例涉及的MAC PDU的数据格式示意图；
图6B是本发明实施例涉及的MAC RAR的数据格式示意图；
图7是本发明实施例提供的一种装置的结构示意图；
图8是本发明实施例提供的网络设备的结构示意图；
图9是本发明实施例提供的终端设备的结构示意图。
具体实施方式
本发明的实施方式部分使用的术语仅用于对本发明的具体实施例进行解释，而非旨在限定本发明。
为了便于理解本发明实施例，首先介绍本发明实施例涉及的中继(Relay) 技术。
参见图1，图1是本发明实施例涉及的中继通信系统的示意图。如图1所示，中继技术就是：在基站与终端设备之间增加了一个或多个中继节点，负责对无线信号进行一次或者多次的转发，即无线信号要经过多跳才能到达终端设备。以较简单的两跳中继为例，就是将一个“基站—终端”链路分割为“基站—中继节点”和“中继节点—终端”两个链路，从而可以将一个质量较差的链路替换为两个质量较好的链路，以获得更高的链路容量及更好的覆盖。同时，对于终端设备来说，终端设备与中继节点间的通信属于设备到设备(Device to Device，D2D)通信，二者之间的数据传输所消耗的功率低。也即是说，终端设备通过中继节点的中转与基站进行通信，降低了数据传输时的发射功率。
应理解的，上述终端设备可以是具有无线移动通信功能的手持设备、计算设备等，例如手机、车载设备、可穿戴设备以及未来5G网络中的终端设备等。
例如，如图1所示，所述终端设备是可穿戴设备。为了减小可穿戴设备的电量消耗，当可穿戴设备周围有可连接的中继设备时，基站可以将可穿戴设备的通信链路切换到可连接的中继设备上，并通过该中继设备的中转与可穿戴设备通信。
图2示出了现有的一种可穿戴设备上报候选中继设备信息的方法。其中，在可穿戴设备与基站建立无线资源控制(Radio Resource Control，RRC)连接之后，基站可以通过RRC连接重配置(Reconfiguration)消息指示可穿戴设备上报候选中继设备的测量结果。然后，可穿戴设备响应该指示，将候选中继设备的测量结果发送给基站，以使基站根据该测量结果为可穿戴设备从候选中继设备中选择一个中继设备，并将可穿戴设备的通信链路切换到这个中继设备上。
但是，在一种可能的应用场景中，基站与可穿戴设备之间需要利用刚刚建立的RRC连接进行数据传输，由于这时可穿戴设备还未切换到中继设备上，因此，这时的数据传输需要消耗较大的电量。
针对现有的技术问题，本发明实施例提供了一种切换到中继节点的方法、相关设备及系统，可实现尽早将终端设备(如可穿戴设备)切换到中继节点，降低所述终端设备的耗电。以下分别进行详细说明。
参见图3，图3是本发明实施例提供的一种切换到中继节点的方法的流程示意图。如图3所示，该方法包括：
S101，在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息。
应理解的，在所述初始随机接入之前，所述终端设备处于RRC空闲态(RRC_IDLE)。经过所述初始随机接入过程，所述终端设备可以从RRC空闲态(RRC_IDLE)转移到RRC连接态(RRC_CONNECTED)。
S103，相应的，在针对所述目标小区的初始随机接入过程中，所述终端设备接收到所述基站发送的所述指示信息。并且，所述终端设备响应所述指示信息，将所述候选中继设备的信息发送给所述基站。
本发明实施例中，所述候选中继设备可以是与所述终端设备之间存在设备到设备(Device to Device，D2D)的通信连接的设备。所述D2D通信连接可以是：Wi-Fi(Wireless Fidelity，中文：无线保真)、蓝牙(Bluetooth)、Zigbee，以及基于长期演进(Long Term Evolution，LTE)的D2D通信连接等等。所述终端设备可以对应2个(或以上)候选中继设备，也可以仅对应一个候选中继设备，这里不做限制。
本发明实施例中，所述候选中继设备的信息可包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对应的所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
在一些可能的实现方式中，所述候选中继设备的测量结果可包括：所述候选中继设备与所述终端设备之间的信号强度、所述候选中继设备的负载能力(例如数据缓冲能力、剩余电量等)、所述候选中继设备的当前负载量、信息安全处理(加解密)能力等等。实际应用中，基站可以根据该测量结果为所述终端设备选取出最优或较优的中继设备，将选取出的中继设备作为所述终端设备的目标中继节点。
在一些可能的实现方式中，与所述终端设备具有预设配对关系的中继设备可以是与所述终端设备预先建立了通信连接的设备。例如，所述终端设备是用 户A的智能手环，该智能手环与用户A的手机通过蓝牙预先绑定。那么，该手机与该智能手环之间即具有所述预设配对关系。实际应用中，考虑到用户数据的安全，基站可以优先选择与所述终端设备具有预设配对关系的中继设备作为所述终端设备的目标中继节点。
本发明实施例中，所述中继设备的标识信息可以是中继设备的无线网络临时标识(Radio Network Temporary Identity，RNTI)，也可以是中继设备的MAC地址，还可以是其他能够使基站辨识出所述中继设备的标识信息，这里不做限制。
S105，相应的，所述基站接收到所述终端设备发送的所述候选中继设备的信息。并且，所述基站根据所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点。
S107，所述基站将所述终端设备切换到所述目标中继节点。
应理解的，初始随机接入过程是基于竞争的随机接入过程，初始随机接入过程涉及的随机接入消息包括：
1.随机接入前导码(preamble)，又称为消息1(简称Msg1)。随机接入前导码由终端设备发送给基站，用于请求上行同步。
2.随机接入响应(Random Access Response，RAR)，又称为消息2(简称Msg2)。RAR是基站针对所述随机接入前导码的响应。
3.消息3。消息3由终端设备发送给基站。在初始随机接入过程中，消息3包含RRC连接建立请求(RRC Connection Request)。
4.竞争解决消息(Contention Resolution)，又称为消息4(简称Msg4)。竞争解决消息由基站发送给终端设备。如果终端设备收到与终端设备的用户标识相关的竞争决议，认为成功随机接入，终端设备从RRC空闲状态转为RRC连接状态，随机接入过程完成。
5.RRC连接建立完成消息(RRC connection setup complete)，又称为消息5(简称Msg5)。RRC连接建立完成消息由终端设备发送给基站，至此，RRC连接建立过程完成。
本发明实施例中，只要终端设备能够尽早的向基站上报候选中继设备的信息，基站就可以尽早的将终端设备(如可穿戴设备)切换到中继节点，降低所 述终端设备的耗电。下面结合图4A-4B说明本发明实施例提供的几种主要的终端设备上报候选中继设备的信息的实施方式。
如图4A所示，基站向终端设备发送的所述指示信息可以携带在随机接入响应(Random Access Response，RAR)(即消息2)中。也即是说，基站可以利用初始随机接入过程中的第一条下行随机接入消息来指示终端设备上报候选中继设备的信息。在接收到所述随机接入响应中携带的所述指示信息之后，终端设备可以在以下至少一种上行消息中携带所述候选中继设备的信息：消息3，RRC连接建立完成消息(即消息5)或RRC连接建立完成消息之后的上行消息。
具体应用图4A所示的实施方式时，所述终端设备可以根据实际需求来选择在上述哪一种或哪几种上行消息中携带所述候选中继设备的信息。
实际应用中，由于消息3是RAR之后的第一条上行随机接入消息，通过消息3上报所述候选中继设备的信息可使基站可以尽早的将终端设备切换到中继设备。
实际应用中，如果所述候选中继设备的信息的数据量较大，可以选择在预留数据位相对较多(相较于消息3)的消息5中传输所述候选中继设备的信息。
实际应用中，为了弥补可能出现的所述候选中继设备的信息的丢失，所述终端设备可以通过消息3，RRC连接建立完成消息(即消息5)或RRC连接建立完成消息之后的上行消息中的两种或两种以上向所述基站发送所述候选中继设备的信息。也即是说，所述终端设备可以通过重复发送所述候选中继设备的信息来确保所述基站能够成功接收到所述候选中继设备的信息，最终成功进行中继切换。
需要说明的，在图4A所示的实施方式中，除了将所述指示信息携带在随机接入响应中，所述基站还可以在竞争解决消息中重复传输所述指示信息。也即是说，所述指示信息也可以携带在所述随机接入响应和所述竞争解决消息中，可弥补可能出现的所述指示信息的丢失。
进一步的，所述基站在通过随机接入响应向所述终端设备发送所述指示信息之前，需要获知所述终端设备的设备类型。在获知所述终端设备的设备类型是指定设备类型(例如可穿戴设备)的条件下，所述基站才会通过随机接入响应向所述终端设备发送所述指示信息。
这里，所述指定设备类型的设备是指自身蓄电能力较弱，无法支撑与所述基站进行较长时间的独立通信的设备，这种设备通常需要借助所述候选中继设备(蓄电能力相对较强)的中转来保持与所述基站进行较长时间的通信。例如，所述指定设备类型的设备具体可以是：蓄电能力较弱(例如低于1000mAh)的可穿戴设备、M2M(Machine to Machine)设备、手机等无线通信设备，也可以是：在与基站保持通信连接的状态下待机时间低于普通智能手机的待机时间的50％的无线通信设备。示例仅仅用于解释本发明实施例，不应构成限定。
在图4A所示的实施方式中，所述终端设备可以通过随机前导码来指示所述终端设备的设备类型。具体的，所述终端设备可以通过以下几种方式来指示自己的设备类型：
在第一种实现方式中，可以通过承载所述随机接入前导码的物理随机接入信道(Physical Random Access Channel，PRACH)资源指示所述终端设备的设备类型。图5A示出了承载随机接入前导码的PRACH资源(包括附图中“1”，“2”和“3”)。具体实现中，可以通过区分承载前导码的资源来区分该前导码的指示意义。例如，如图5A所示，虚线圈选中的PRACH资源上承载的随机接入前导码是一种特殊的前导码，表示发送该随机接入前导码的终端设备是所述指定类型的设备(例如可穿戴设备)。示例仅仅用于解释本发明实施例，不应构成限定。
应理解的，相应的，基站可以通过承载所述随机接入前导码的PRACH资源获知所述终端设备的设备类型。
在第二种实现方式中，可以通过所述随机接入前导码的格式指示所述终端设备的设备类型。如图5B所示，随机接入前导码有5种格式。其中，前导码格式0占用1个子帧，前导码格式1和前导码格式2占用2个子帧，前导码格式3占用3个子帧。特殊地，前导码格式4只能在上行链路导频时隙(Uplink Pilot Time Slot，UpPTS)中使用。具体实现中，可以通过区分随机接入前导码的前导码格式来区分该随机接入前导码的指示意义。例如，前导码格式0的随机接入前导码是一种特殊的前导码，表示发送该随机接入前导码的终端设备是所述指定类型的设备(例如可穿戴设备)。示例仅仅用于解释本发明实施例，不应构成限定。
应理解的，相应的，基站可以通过所述随机接入前导码的格式获知所述终 端设备的设备类型。
在第三种实现方式中，通过所述随机接入前导码所在的组指示所述终端设备的设备类型。如图5C所示，一个小区内有64个可用的前导码，目前对这些前导码已经划分了2个组：组A(group A)和组B(group B)。具体实现中，可以通过区分随机接入前导码所在的组来区分该随机接入前导码的指示意义。例如，如图5C所示，虚线圈选中的随机接入前导码划分为一个特殊的前导码组，表示发送这个特殊组内的随机接入前导码的终端设备是所述指定类型的设备(例如可穿戴设备)。示例仅仅用于解释本发明实施例，不应构成限定。
应理解的，相应的，基站可以通过所述随机接入前导码所在的组获知所述终端设备的设备类型。
如图4B所示，基站向终端设备发送的所述指示信息可以携带在竞争解决消息(Contention Resolution)(即消息4)中。也即是说，基站可以利用初始随机接入过程中的第二条下行随机接入消息来指示终端设备上报候选中继设备的信息。在接收到所述竞争解决消息中携带的所述指示信息之后，终端设备可以在以下至少一种上行消息中携带所述候选中继设备的信息：RRC连接建立完成消息(即消息5)或RRC连接建立完成消息之后的上行消息。
具体应用图4B所示的实施方式时，所述终端设备可以根据实际需求来选择在RRC连接建立完成消息和RRC连接建立完成消息之后的上行消息中的一种或两种上行消息中携带所述候选中继设备的信息。具体内容可参考图4A实施方式中的相关内容，这里不再赘述。
进一步的，所述基站在通过竞争解决消息向所述终端设备发送所述指示信息之前，需要获知所述终端设备的设备类型。在获知所述终端设备的设备类型是指定设备类型(例如可穿戴设备)的条件下，所述基站才会通过竞争解决消息向所述终端设备发送所述指示信息。关于所述指定设备类型的相关说明请参考图4A实施方式中的相关内容，这里不再赘述。
在图4B所示的实施方式中，与图4A对应的实施方式类似，所述终端设备可以通过随机前导码来指示所述终端设备的设备类型。关于通过前导码指示所述终端设备的设备类型的具体实现细节请参考图4A实施方式中的相关内容， 这里不再赘述。
在图4B所示的实施方式中，所述终端设备还可以通过消息3来指示所述终端设备的设备类型。即，所述终端设备的设备类型的信息可以携带在消息3中。相应的，所述基站可以通过消息3获知所述终端设备的设备类型。
应理解的，随机接入过程涉及的随机接入消息(即上述消息1至消息5)实质上均是媒体接入控制层协议数据单元(MAC Protocol Data Unit，MAC PDU)(媒体接入控制，英文：Media Access Control，简称MAC)。
图6A示出了上行、下行随机接入消息的MAC PDU(除随机接入响应RAR外)。如图6A所示，MAC PDU包括：一个MAC头部(MAC header)，零个或多个服务数据单元(Service Data Unit，SDU)，零个或多个信息控制单元(Control element)，可能还有填充位(padding)。其中，一个MAC头部可能有一个或多个子头部(subheader)，一个子头部由六个域(R/R/E/LCID/F/L)或者四个域(R/R/E/LCID)组成。
本发明实施例中，消息3携带所述候选中继设备的信息的具体方式可如下：
在一种可能的实现方式中，所述终端设备可以通过在消息3中增加一个或多个信息控制单元(由MAC层产生)，利用增加的信息控制单元传输消息3中携带的所述候选中继设备的信息，或者利用增加的信息控制单元来指示所述终端设备的设备类型。
在另一种些可能的实现方式中，所述终端设备可以通过在消息3中的一个或多个SDU(由上层产生)传输消息3中携带的所述候选中继设备的信息，或者，利用所述一个或多个SDU来指示所述终端设备的设备类型。由于SDU来自上层(例如RRC层)，因此，所述终端设备可以在消息3的上层消息(例如RRC Connection Request)中添加所述候选中继设备的信息或者所述设备类型信息。
与消息3携带所述候选中继设备的信息的方式类似，所述基站可以通过竞争解决消息中增加一个或多个信息控制单元，利用增加的信息控制单元传输竞争解决消息中携带的所述指示信息。所述基站也可以在竞争解决消息上层消息(例如RRC Connection Setup)中添加所述指示信息。
与消息3携带所述候选中继设备的信息的方式类似，所述终端设备可以通 过在RRC连接建立完成消息中增加一个或多个信息控制单元，利用增加的信息控制单元传输RRC连接建立完成消息中携带的所述候选中继设备的信息。所述终端设备也可以在RRC连接建立完成消息的上层消息中添加所述候选中继设备的信息。
图6B示出了MAC RAR(随机接入响应)。如图6B所示，包括以下几个于域：预留位R、时间提前命令域(Timing Advance Command)、上行授权域(Uplink Grant，简称UL Grant)，和临时C-RNTI域(Temporary C-RNTI)(C-RNTI：Cell Radio Network Temporary Identify，中文：小区无线网络临时标识)。
在一些可能的实现方式中，所述基站可以在针对所述终端设备的MAC RAR中增加随机接入响应(RAR)携带的所述指示信息。具体的，所述基站可以利用所述预留位R来发送所述指示信息，指示所述终端设备上报候选中继设备的信息。
通过实施图3方法实施例，在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息。并且，所述基站从所述候选中继设备中确定出目标中继节点，最后将所述终端设备切换到所述目标中继节点，可实现尽早将终端设备(如可穿戴设备)切换到中继节点，降低所述终端设备的耗电。
基于同一发明构思，本发明实施例还提供一种装置(如图7所示)，该装置用于实现前述图3实施例所描述的方法。如图7所示，装置70包括：发射器703、接收器704、存储器702和与存储器702耦合的处理器701(处理器701的数量可以是一个或多个，图7中以一个处理器为例)。发射器703、接收器704、存储器702和处理器701可通过总线或者其它方式连接(图7中以通过总线连接为例)。其中，发射器703用于向外部发送数据，接收器704用于从外部接收数据。存储器702用于存储程序代码，处理器701用于调用并运行存储于存储器702中的程序代码。
当装置70为网络设备时，存储器702中存储的程序代码具体用于实现图3实施例中的所述基站的功能。具体的，处理器701用于调用存储器702中存储的程 序代码，并执行以下步骤：
在终端设备发起针对目标小区的初始随机接入过程中，利用发射器703通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；
利用接收器704接收所述终端设备上报的所述候选中继设备的信息；
根据接收器704接收的所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；
将所述终端设备切换到所述目标中继节点。
本发明实施例中，所述指示信息可以被携带在以下至少一种消息中：随机接入响应、竞争解决消息。
具体的，如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
具体的，如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
关于本发明实施例提供的几种主要的终端设备上报候选中继设备的信息的实施方式，请参考图3实施例中的内容，这里不赘述。
可选的，如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，则处理器701还可用于通过接收器704接收的随机接入前导码获知所述终端设备的设备类型。
具体实现中，处理器701可用于：通过承载所述随机接入前导码的PRACH资源获知所述终端设备的设备类型；或，通过所述随机接入前导码的格式获知所述终端设备的设备类型；或，通过所述随机接入前导码所在的组获知所述终端设备的设备类型。关于通过所述随机接入前导码获知所述终端设备类型的实现方式可具体参考图3实施例中的内容，这里不赘述。
可选的，如果所述指示信息被携带在所述竞争解决消息里，则处理器701还用于通过接收器704接收的消息3获知所述终端设备的设备类型，其中，所述 消息3中携带所述终端设备的设备类型信息。
需要说明的，当装置70为网络设备时，处理器701的执行步骤以及处理器701涉及的其他技术特征还可参照图3方法实施例中所述基站的相关内容，这里不再赘述。
当装置70为终端设备时，存储器702中存储的程序代码具体用于实现图3实施例中的所述终端设备的功能。具体的，处理器701用于调用存储器702中存储的程序代码，并执行以下步骤：
在针对目标小区的初始随机接入过程中，利用所述接收器接收所述目标小区对应的基站通过随机接入消息发送的指示信息；所述指示信息用于通知所述终端设备上报所述终端设备对应的候选中继设备的信息；
响应所述指示信息，利用所述发射器将所述候选中继设备的信息发送给所述基站，以使基站从所述候选中继设备中确定出目标中继节点，并将所述终端设备切换到所述目标中继节点。
本发明实施例中，所述指示信息可以被携带在以下至少一种消息中：随机接入响应，或者竞争解决消息。
具体的，如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
具体的，如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息可以被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
关于本发明实施例提供的几种主要的终端设备上报候选中继设备的信息的实施方式，请参考图3实施例中的内容，这里不赘述。
可选的，如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，则处理器701还用于通过所述发射器发送的随机接入前导码指示所述终端设备的设备类型。
具体的，处理器701可具体用于：通过承载所述随机接入前导码的PRACH 资源指示所述终端设备的设备类型；或，通过所述随机接入前导码的前导码格式指示所述终端设备的设备类型；或，通过所述随机接入前导码所在的组指示所述终端设备的设备类型。关于通过所述随机接入前导码指示所述终端设备类型的实现方式可具体参考图3实施例中的内容，这里不赘述。
可选的，如果所述指示信息被携带在所述竞争解决消息里，则处理器701还用于通过所述发射器发送的消息3指示所述终端设备的设备类型，其中，所述消息3中携带所述终端设备的设备类型信息。
需要说明的，当装置70为终端设备时，处理器701的执行步骤以及处理器701涉及的其他技术特征还可参照图3方法实施例中所述终端设备的相关内容，这里不再赘述。
基于同一发明构思，本发明实施例还提供一种网络设备(图8所示)和一种终端设备(图9所示)，用于执行前述图3实施例描述的一种切换到中继节点的方法。
如图8所示，网络设备80可包括：发送单元801、接收单元803、确定单元805和中继切换单元807。其中：
发送单元801用于在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；
接收单元803用于接收所述终端设备上报的所述候选中继设备的信息；
确定单元805用于根据所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；
中继切换单元807用于将所述终端设备切换到所述目标中继节点。
需要说明的，通过前述图3实施例的详细描述，本领域技术人员可以清楚的知道网络设备80所包含的各个功能模块的实现方法，所以为了说明书的简洁，在此不再详述。
如图9所示，终端设备90可包括：接收单元901和发送单元903。其中：
接收单元901可用于在针对目标小区的初始随机接入过程中，接收所述目 标小区对应的基站通过随机接入消息发送的指示信息；所述指示信息用于通知所述终端设备上报所述终端设备对应的候选中继设备的信息；
发送单元903可用于响应所述指示信息，将所述候选中继设备的信息发送给所述基站，以使基站从所述候选中继设备中确定出目标中继节点，并将所述终端设备切换到所述目标中继节点。
需要说明的，通过前述图3实施例的详细描述，本领域技术人员可以清楚的知道终端设备90所包含的各个功能模块的实现方法，所以为了说明书的简洁，在此不再详述。
另外，本发明实施例还提供了一种通信系统，该通信系统包括：网络设备和终端设备。所述网络设备和所述终端设备分别对应图3方法实施例中的所述基站和所述终端设备。
具体实现中，所述网络设备可以是图7所示装置表征的网络设备，也可以是图7所示装置表征的终端设备。所示网络设备也可以是图8所示的网络设备80，所示终端设备也可以是图9所示的终端设备90。
实施本发明实施例，在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息。并且，所述基站从所述候选中继设备中确定出目标中继节点，最后将所述终端设备切换到所述目标中继节点，可实现尽早将终端设备(如可穿戴设备)切换到中继节点，降低所述终端设备的耗电。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方 框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (33)

  1. 一种切换到中继节点的方法，其特征在于，包括：
    在终端设备发起针对目标小区的初始随机接入过程中，所述目标小区的基站通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；
    接收所述终端设备上报的所述候选中继设备的信息；
    根据所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；
    将所述终端设备切换到所述目标中继节点。
  2. 如权利要求1所述的方法，其特征在于，所述指示信息被携带在以下至少一种消息中：随机接入响应，或者竞争解决消息。
  3. 如权利要求2所述的方法，其特征在于，
    如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息；
    如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
  4. 如权利要求2或3所述的方法，其特征在于，还包括：
    如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，则所述基站通过随机接入前导码获知所述终端设备的设备类型。
  5. 如权利要求4所述的方法，其特征在于，所述通过随机接入前导码获知所述终端设备的设备类型，包括：
    通过承载所述随机接入前导码的PRACH资源获知所述终端设备的设备类型；
    或，通过所述随机接入前导码的前导码格式获知所述终端设备的设备类型；
    或，通过所述随机接入前导码所在的组获知所述终端设备的设备类型。
  6. 如权利要求2-5中任一项所述的方法，其特征在于，还包括：
    如果所述指示信息被携带在所述竞争解决消息里，则通过消息3获知所述终端设备的设备类型；所述消息3中携带所述终端设备的设备类型信息。
  7. 如权利要求4-6中任一项所述的方法，其特征在于，所述通过随机接入消息向终端设备发送指示信息，包括：
    在所述终端设备的设备类型是指定设备类型的条件下，通过随机接入消息向所述终端设备发送所述指示信息。
  8. 如权利要求1-7中任一项所述的方法，其特征在于，所述候选中继设备的信息包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对应的所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
  9. 一种切换到中继节点的方法，其特征在于，包括：
    在针对目标小区的初始随机接入过程中，终端设备接收所述目标小区对应的基站通过随机接入消息发送的指示信息；所述指示信息用于通知所述终端设备上报所述终端设备对应的候选中继设备的信息；
    所述终端设备响应所述指示信息，将所述候选中继设备的信息发送给所述基站，以使基站从所述候选中继设备中确定出目标中继节点，并将所述终端设备切换到所述目标中继节点。
  10. 如权利要求9所述的方法，其特征在于，所述指示信息被携带在以下至少一种消息中：随机接入响应，或者竞争解决消息。
  11. 如权利要求10所述的方法，其特征在于，
    如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息；
    如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
  12. 如权利要求10或11所述的方法，其特征在于，还包括：
    如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的 至少一种里，则所述终端设备通过随机接入前导码指示所述终端设备的设备类型。
  13. 如权利要求12所述的方法，其特征在于，所述通过随机接入前导码指示所述终端设备的设备类型，包括：
    通过承载所述随机接入前导码的PRACH资源指示所述终端设备的设备类型；
    或，通过所述随机接入前导码的前导码格式指示所述终端设备的设备类型；
    或，通过所述随机接入前导码所在的组指示所述终端设备的设备类型。
  14. 如权利要求10-13中任一项所述的方法，其特征在于，还包括：如果所述指示信息被携带在所述竞争解决消息里，则通过消息3指示所述终端设备的设备类型；所述消息3中携带所述终端设备的设备类型信息。
  15. 如权利要求12-14中任一项所述的方法，其特征在于，所述指示信息是在所述终端设备的设备类型是指定设备类型的条件下由所述基站发送的。
  16. 如权利要求9-15中任一项所述的方法，其特征在于，所述候选中继设备的信息包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
  17. 一种网络设备，其特征在于，包括：处理器、发射器和接收器，其中：所述处理器用于执行以下步骤：
    在终端设备发起针对目标小区的初始随机接入过程中，利用所述发射器通过随机接入消息向所述终端设备发送指示信息，用于指示所述终端设备上报所述终端设备对应的候选中继设备的信息；
    利用所述接收器接收所述终端设备上报的所述候选中继设备的信息；
    根据所述接收器接收的所述候选中继设备的信息，从所述候选中继设备中确定出用于所述终端设备与基站之间进行中继通信的目标中继节点；
    将所述终端设备切换到所述目标中继节点。
  18. 如权利要求17所述的网络设备，其特征在于，所述指示信息被携带在以下至少一种消息中：随机接入响应、竞争解决消息。
  19. 如权利要求18所述的网络设备，其特征在于，如果所述指示信息被携 带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息；
    如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
  20. 如权利要求18或19所述的网络设备，其特征在于，如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，则所述处理器还用于通过所述接收器接收的随机接入前导码获知所述终端设备的设备类型。
  21. 如权利要求20所述的网络设备，其特征在于，所述处理器具体用于：
    通过承载所述随机接入前导码的PRACH资源获知所述终端设备的设备类型；
    或，通过所述随机接入前导码的格式获知所述终端设备的设备类型；
    或，通过所述随机接入前导码所在的组获知所述终端设备的设备类型。
  22. 如权利要求18-21中任一项所述的网络设备，其特征在于，如果所述指示信息被携带在所述竞争解决消息里，则所述处理器还用于通过所述接收器接收的消息3获知所述终端设备的设备类型；所述消息3中携带所述终端设备的设备类型信息。
  23. 如权利要求20-22中任一项所述的网络设备，其特征在于，所述处理器具体用于：在所述终端设备的设备类型是指定设备类型的条件下，利用所述发射器通过随机接入消息向所述终端设备发送所述指示信息。
  24. 如权利要求17-23中任一项所述的网络设备，其特征在于，所述候选中继设备的信息包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对应的所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
  25. 一种终端设备，其特征在于，包括：处理器、发射器和接收器，其中：所述处理器用于执行以下步骤：
    在针对目标小区的初始随机接入过程中，利用所述接收器接收所述目标小 区对应的基站通过随机接入消息发送的指示信息；所述指示信息用于通知所述终端设备上报所述终端设备对应的候选中继设备的信息；
    响应所述指示信息，利用所述发射器将所述候选中继设备的信息发送给所述基站，以使基站从所述候选中继设备中确定出目标中继节点，并将所述终端设备切换到所述目标中继节点。
  26. 如权利要求25所述的终端设备，其特征在于，所述指示信息被携带在以下至少一种消息中：随机接入响应，或者竞争解决消息。
  27. 如权利要求26所述的终端设备，其特征在于，
    如果所述指示信息被携带在所述随机接入响应里，或者，被携带在所述随机接入响应和竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：随机接入消息3，RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息；
    如果所述指示信息被携带在所述竞争解决消息里，则所述候选中继设备的信息被携带在以下至少一种消息中：RRC连接建立完成消息，或者所述RRC连接建立完成消息之后的上行消息。
  28. 如权利要求26或27所述的终端设备，其特征在于，如果所述指示信息被携带在所述随机接入响应或所述竞争解决消息中的至少一种里，则所述处理器还用于通过所述发射器发送的随机接入前导码指示所述终端设备的设备类型。
  29. 如权利要求28所述的终端设备，其特征在于，所述处理器具体用于：
    通过承载所述随机接入前导码的PRACH资源指示所述终端设备的设备类型；
    或，通过所述随机接入前导码的前导码格式指示所述终端设备的设备类型；
    或，通过所述随机接入前导码所在的组指示所述终端设备的设备类型。
  30. 如权利要求26-29中任一项所述的终端设备，其特征在于，如果所述指示信息被携带在所述竞争解决消息里，则所述处理器还用于通过所述发射器发送的消息3指示所述终端设备的设备类型；所述消息3中携带所述终端设备的设备类型信息。
  31. 如权利要求28-30中任一项所述的终端设备，其特征在于，所述指示 信息是在所述终端设备的设备类型是指定设备类型的条件下由所述基站发送的。
  32. 如权利要求15-31中任一项所述的终端设备，其特征在于，所述候选中继设备的信息包括以下至少一项：所述终端设备对应的候选中继设备的标识信息以及所述终端设备对所述候选中继设备的测量结果；或者，与所述终端设备具有预设配对关系的中继设备的标识信息。
  33. 一种通信系统，其特征在于，包括：网络设备和终端设备，其中：
    所述网络设备是权利要求17-24中任一项所述的网络设备；
    所述终端设备是权利要求25-32中任一项所述的终端设备。
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