WO2016008426A1 - D2d通信终端及其通信方法 - Google Patents

D2d通信终端及其通信方法 Download PDF

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Publication number
WO2016008426A1
WO2016008426A1 PCT/CN2015/084206 CN2015084206W WO2016008426A1 WO 2016008426 A1 WO2016008426 A1 WO 2016008426A1 CN 2015084206 W CN2015084206 W CN 2015084206W WO 2016008426 A1 WO2016008426 A1 WO 2016008426A1
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WIPO (PCT)
Prior art keywords
mode
terminal
data
transmission
interrupted
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PCT/CN2015/084206
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English (en)
French (fr)
Inventor
李波
蒋琦
刘仁茂
Original Assignee
夏普株式会社
李波
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Application filed by 夏普株式会社, 李波 filed Critical 夏普株式会社
Priority to US15/326,874 priority Critical patent/US20170215114A1/en
Publication of WO2016008426A1 publication Critical patent/WO2016008426A1/zh

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    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure

Definitions

  • the present invention generally relates to device to device (D2D) communication. Specifically, it relates to a resource release and reuse mechanism when switching between mode 1 (Mode 1) and mode 2 (Mode 2) in a D2D communication system.
  • D2D device to device
  • the D2D (Device to Device) technology refers to a communication method in which two peer user nodes directly communicate with each other. Direct communication technology is very critical in many areas where 3GPP is not yet standardized. Including the P2P (Peer to Peer) in the non-cellular working mode Ad hoc, which has been continuously studied in the academic field in recent years, and the killer application that has always had great potential business needs - M2M (Machine to Machine) in the Internet of Things. In such a centralized or distributed network of terminal direct communication users, each user node can transmit and receive signals and may have the function of automatically routing (forwarding messages). The physical resources used to carry their communications may be configured by the network or by competition between terminals of each directly connected communication.
  • these terminal direct communication services are carried out under the configuration of the network, which is not only an effective supplement to the existing cellular system to more effectively utilize the air interface resources, but also can incorporate various physical devices into the connection system.
  • Services such as networking and car networking have the potential to be implemented under the framework of the 3GPP cellular network.
  • the terminal direct connection communication service can also be used without the assistance of the base station.
  • this provides a powerful means of timely rescue, such as disasters in areas such as earthquakes and floods, which is a powerful complement to existing cellular services.
  • the standardization of terminal direct communication has been promoted within 3GPP.
  • the LTE Rel-12 standard will support D2D services.
  • different D2D transmission modes are required under different network coverage conditions.
  • the D2D communication mode under network scheduling and control is usually adopted, that is, mode 1 and non-network coverage.
  • the D2D communication mode under non-network scheduling and control namely Mode 2 will be adopted.
  • the D2D communication mode will switch when the network coverage condition or network signal strength changes.
  • mode 1 is switched to mode 2. If the resources occupied by the interrupted transmission due to the D2D mode switching cannot be released in time, the resource will be wasted. It can be seen from Table 1-1 and Table 1-2 below (which correspond to Table 6.1.3.1-1 and Table 6.1.3.1-2 in 3GPP TS 36.321, respectively) when the buffer status report (BSR) is to be When the transmission data buffer size is large, or when one transmission period of the D2D scheduling is long, the transmission resources that are not released or utilized due to the transmission interruption caused by the D2D mode switching will be very spectacular.
  • BSR buffer status report
  • the present invention proposes a mechanism for efficiently utilizing physical resources when switching between mode 1 and mode 2 in a D2D communication system. Specifically, the present invention proposes that all or part of resources scheduled for interrupted transmission may be released in order to efficiently utilize physical resources when mode 1 transmission is interrupted or when switching between mode 1 and mode 2 is performed in a D2D communication system. .
  • a method performed in a terminal supporting device to device (D2D) communication can include detecting network conditions during transmission in D2D mode 1, and reporting the detected network conditions to the base station to assist the base station to release physical resources scheduled for the terminal in time for transmission interruption.
  • the method may further include retaining the interrupted transmission (or "interrupted scheduling") data to be transmitted if the detected network condition satisfies a trigger condition for the data reception interruption, and executing from mode 1 to mode Switch 2 to send the retained data in mode 2.
  • the base station will release all resources of the interrupted transmission scheduled to the terminal.
  • the triggering condition for the data reception to be interrupted may be that the network condition indicates that a radio link failure has occurred. In other embodiments, the triggering condition for the interruption of data reception may be that the network condition indicates that a radio link failure is about to occur or is likely to occur, for example, the network condition indicates that the radio link quality is lower than a preset criterion.
  • the terminal will retain all data to be transmitted by the interrupted schedule. Thus, after switching to Mode 2, the terminal will send all data, including data that has been sent in Mode 1.
  • the terminal during a switch from Mode 1 to Mode 2, the terminal will only retain data that has not been transmitted for the interrupted transmission, while discarding the data that the current schedule has sent. Thus, after switching to mode 2, the terminal will only transmit data that has not yet been transmitted.
  • the terminal reports to the base station the wireless link connection status between the terminal and the base station as the network condition.
  • the terminal reports the channel measurement value at the terminal to the base station as the network condition.
  • the terminal will transmit the detected network conditions to the base station periodically or irregularly during mode 1 communication and during the time when the data scheduled to be transmitted by the current scheduling indicated by the BSR has not been transmitted. Or preferably, the terminal is only executed when the current network condition is below a threshold, such as when the current channel measurement is below a threshold.
  • a method performed in a terminal supporting device to device "D2D” communication may include detecting a network condition during transmission in D2D mode 1, and reporting the detected network condition to the base station to assist the base station to release the physical resource scheduled for the terminal in time when the transmission is interrupted; if the detected network condition A trigger condition that satisfies the interruption of data reception, retains the data that has not been transmitted by the interrupted transmission (or "interrupted scheduling"), and suspends mode 1 until the cell reselection succeeds; and, if the cell is reselected In the same manner as the original cell that the terminal accesses before the radio link failure occurs, the suspended mode 1 is resumed to continue transmitting the data of the reserved interrupted transmission that has not yet been transmitted.
  • the physical resources allocated for the data that has not been transmitted for the interrupted transmission are reserved, so that the terminal re-accesses the original access cell and resumes mode 1 when the mode 1 is resumed. Or retransmit the data to be transmitted this time.
  • any physical resources allocated for interrupted transmissions are not retained when mode 1 is suspended. And the method further includes re-applying the resource when the mode 1 is restored to continue transmitting the data of the reserved interrupted transmission that has not been transmitted using the re-applied resource.
  • a method performed in a terminal supporting device-to-device "D2D" communication may include detecting a network condition during transmission in D2D mode 1, and reporting the detected network condition to the base station to assist the base station to release the physical resource scheduled for the terminal in time when the transmission is interrupted; if the detected network condition A trigger condition that satisfies the interruption of data reception or a command to switch to mode 2 is received from the network. Then, the mode 1 transmission is suspended, the data that has not been transmitted by the interrupted transmission is retained, and the switching from mode 1 to mode 2 is performed to transmit the retained data that has not been transmitted in mode 2.
  • the method may further include: if cell reselection occurs during mode 2 transmission, and the reselected cell is the same as the original cell that the terminal accessed before the radio link failure occurred, then the mode 2 is aborted The transmission, the interrupted mode 2 is reserved for the data that has not yet been transmitted, and the switching from mode 2 to mode 1 is performed to transfer the unsent data in mode 2, which continues to be interrupted in mode 1.
  • the method further comprises returning to mode 1 if the handover from mode 1 to mode 2 is not successful within a predetermined time and the terminal reselects to the original cell that was accessed before the radio link failure occurred. Send the remaining data that has not been sent.
  • the base station releases the interrupted transmission scheduled to the terminal in time when the transmission is interrupted. All resources. Therefore, when the terminal returns to mode 1, if there is still unsent data, it is necessary to re-apply for the data that has not yet been transmitted.
  • a terminal supporting device-to-device "D2D" communication includes: detecting means configured to detect a network condition during transmission in D2D mode 1; and reporting means configured to report the detected network condition to the base station to assist the base station to release the physical resource scheduled to the terminal in time when the transmission is interrupted a mode switching device configured to retain data to be transmitted by the interrupted transmission and to perform switching from mode 1 to mode 2, and to perform data transmission, in a case where the detected network condition satisfies a trigger condition in which the data reception is interrupted The device resumes or retransmits the retained data in the mode 2 that is switched to after the mode switching succeeds.
  • a terminal supporting device-to-device "D2D" communication includes: detecting means configured to detect a network condition during transmission in D2D mode 1; and reporting means configured to report the detected network condition to the base station to assist the base station to release the physical scheduled to the terminal in time when the transmission is interrupted a suspending device configured to retain data that has not been transmitted if the detected network condition satisfies a data reception interruption condition, and suspend mode 1 until cell reselection succeeds; and recover the device , configured as: if the reselected cell and terminal are in a radio link failure If the former cell to which the former access is the same, the suspended mode 1 is resumed to continue transmitting the data of the reserved interrupted transmission that has not yet been transmitted.
  • the suspending device is further configured to: reserve, in suspend mode 1, a physical resource allocated for the data that has not been transmitted for the interrupted transmission, to reserve the terminal for re-accessing the original access cell and recovering mode 1 Use these resources to retransmit or retransmit the data to be transmitted this time.
  • the suspending device is further configured to not reserve any physical resources allocated for the interrupted transmission when suspending mode 1.
  • the terminal further includes a resource application device configured to: re-apply the resource when the mode 1 is restored, to continue to send the data of the reserved interrupted transmission that has not been sent, using the re-applied resource.
  • a terminal supporting device-to-device "D2D" communication includes: detecting means configured to detect a network condition during transmission in D2D mode 1; and reporting means configured to report the detected network condition to the base station to assist the base station to release the physical resource scheduled to the terminal in time when the transmission is interrupted a receiving device configured to receive a command from the network; and a mode switching device configured to: suspend mode 1 if the detected network condition satisfies a trigger condition for data reception interruption or receives a command to switch to mode 2 from the network
  • the transmission, the data that has not been transmitted by the interrupted transmission is retained, and the switching from mode 1 to mode 2 is performed to transmit the retained data that has not been transmitted in mode 2.
  • the terminal further includes a recovery device.
  • the recovery device is configured to suspend mode 2 transmission if the cell reselection occurs during mode 2 transmission, and the reselected cell is the same as the original cell accessed by the terminal before the radio link failure occurs, and the reservation is interrupted.
  • Mode 2 transmits the data that has not yet been transmitted, and performs a switch from mode 2 to mode 1 to continue transmitting the data of the interrupted transmission that has not been transmitted or has not been transmitted before returning to mode 1 in mode 1.
  • the recovery device is further configured to: if the handover from mode 1 to mode 2 is not successful within a predetermined time, and the terminal reselects to the original cell that was accessed prior to the occurrence of the radio link failure, then returning The reserved data that has not been transmitted is transmitted in mode 1.
  • Figure 1 shows a flow chart of a method in accordance with a first embodiment of the invention.
  • Fig. 2 shows a flow chart of a specific implementation of the method according to the first embodiment of the invention.
  • Fig. 3 shows a flow chart of another specific implementation of the method according to the first embodiment of the invention.
  • Fig. 4 shows a D2D schematic terminal in accordance with a first embodiment of the present invention.
  • Figure 5 shows a flow chart of a method in accordance with a second embodiment of the invention.
  • Figure 6 shows a flow diagram of one particular implementation of the method in accordance with the second embodiment of the present invention.
  • Figure 7 shows a flow chart of another specific implementation of the method in accordance with the second embodiment of the present invention.
  • Fig. 8 shows a schematic block diagram of a D2D terminal in accordance with a second embodiment of the present invention.
  • Figure 9 shows a flow chart of a method in accordance with a third embodiment of the present invention.
  • Figure 10 shows a flow diagram of one particular implementation of a method in accordance with a third embodiment of the present invention.
  • Figure 11 shows a schematic block diagram of a D2D terminal in accordance with a third embodiment of the present invention.
  • Figure 12-1-a shows the first timing relationship between attempting to switch to mode 2 and attempting to switch back to mode 1 in the third embodiment in accordance with the present invention, and the timing relationship of the entire switching process.
  • Figure 12-1-b shows the second timing relationship between attempting to switch to mode 2 and attempting to switch back to mode 1 in the third embodiment in accordance with the present invention, and the timing relationship of the entire switching process.
  • Figure 12-1-c shows a third timing relationship between attempting to switch to mode 2 and attempting to switch back to mode 1 in a third embodiment in accordance with the present invention, and the timing of the entire switching process relationship.
  • 12-1-d shows a fourth timing relationship between attempting to switch to mode 2 and attempting to switch back to mode 1 in the third embodiment of the present invention, and the timing relationship of the entire switching process.
  • Figure 12-2-a shows the attempt to switch to mode 2 and attempt to switch back to mode 1 in a third embodiment in accordance with the invention when the mode switch is triggered under more aggressive conditions (i.e., when T310 starts).
  • Figure 12-2-b shows an attempt to switch to mode 2 and attempt to switch back to mode 1 in a third embodiment in accordance with the invention when the mode switch is triggered under more aggressive conditions (i.e., when T310 starts).
  • Figure 12-2-c shows an attempt to switch to mode 2 and attempt to switch back to mode 1 in a third embodiment in accordance with the invention when the mode switch is triggered under more aggressive conditions (i.e., when T310 is started).
  • Figure 12-2-d shows an attempt to switch to mode 2 and attempt to switch back to mode 1 in a third embodiment in accordance with the invention when the mode switch is triggered under more aggressive conditions (i.e., when T310 starts).
  • FIG. 1 It should be noted that the following figures and examples are not intended to limit the scope of the invention to the specific embodiments, but that it is also possible to form other embodiments by interchangeing and combining some or all of the elements or elements of the various embodiments.
  • specific components of the invention may be partially or fully implemented using known components, only those components of these known components necessary for understanding the invention will be described and will be omitted from those known components. The detailed description of the other parts is intended to make the invention more prominent.
  • the present invention proposes several mechanisms for retaining and releasing all or part of resources scheduled for transmissions interrupted by handover when Mode 1 and Mode 2 are switched, and introduces terminals (also referred to as User Equipment UEs) and The corresponding behavior of the base station.
  • terminals also referred to as User Equipment UEs
  • the present invention will be described with reference to the 3GPP TS 36.321 and 3GPP TS 36.331 protocols, but the invention is not limited thereto.
  • the present invention designs two physical layer processes that efficiently utilize resources: physical layer process 1 and physical layer process 2.
  • the explanations are as follows:
  • the physical layer process 1 is that a D2D terminal (such as a UE) reports its network condition based on a certain mechanism before a radio link failure (RLF) occurs.
  • the base station such as an eNB
  • the base station determines the D2D transmission mode of the UE according to the network condition reported by the UE, and a series of signaling involved in the entire physical layer process.
  • Physical layer process 1 can have two alternative implementations: physical layer process 1-1 and physical layer process 1-2.
  • the D2D terminal will report the current wireless link connection status between the D2D terminal and the base station to the eNB, that is, whether the network is still in the normal connection state.
  • the eNB will decide to continue scheduling or releasing resources according to such reporting conditions of the D2D terminal.
  • the D2D terminal will report to the eNB the signal quality of the cellular network currently received by the D2D terminal, that is, the channel measurement value (such as RSRP or RSRQ).
  • the eNB will determine the D2D transmission mode of the terminal according to the signal quality reported by the D2D terminal, and determine the continued scheduling or release of the corresponding resource.
  • a trigger condition of the physical layer procedure 1 is that the D2D transmitting terminal is triggered in the network scheduling and the UE requests the current scheduling that the BSR data to be transmitted is not transmitted. For example, the UE may transmit the detected network condition to the base station periodically or irregularly during normal mode 1 communication and during the time when the data currently scheduled to be transmitted has not been completed.
  • Another trigger condition of the physical layer process 1 is that the current channel measurement value (such as RSRP or RSRQ) is lower than the pre-condition when the former trigger condition is satisfied. Triggered under the condition that a certain threshold is configured.
  • the physical layer process 2 is a D2D transmission mode switching performed by a D2D terminal (such as a UE) according to a current network condition and a corresponding configuration of a base station (such as an eNB), and a physical layer process in which the terminal continues to schedule or release corresponding resources during the handover.
  • the physical layer procedure 2 specifies several behaviors (UE Behaviors) of the D2D terminal in D2D mode switching.
  • the trigger condition of the physical layer process 2 may be that the current network condition indicates that the RLF has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell reselection process timer T301 or T311 is started.
  • a more aggressive trigger condition for physical layer procedure 2 may be that the current network condition indicates that a radio link failure has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell switching process N310 counter is full and the T310 timer is started (as shown in Figure 12-2-a, Figure 12-2-b, Figure 12-2-c, Figure 12-2-d).
  • the meanings of T301, T311, T310, and N310 are the same as those defined in 3GPP TS36.321, as shown in Table 2-1 and Table 2-2 below.
  • Table 2-1 and Table 2-2 correspond to Table 7.3 and Table 7.4 in 3GPP TS 36.331, respectively.
  • N310 Indicates the maximum number of consecutive "out-of-sync" messages received from the lower layer
  • N311 Indicates the maximum number of consecutive "in-sync” messages received from the underlying layer
  • the physical layer process 2 is divided into two types.
  • the first type of physical layer process 2 is as follows: After satisfying the trigger condition (such as detecting and confirming the RLF), the terminal does not have to wait until switching back to the local cell mode 1 mode to release the associated physical resource allocated for the current scheduling.
  • the first type of physical layer process 2 can be performed, for example, by implementations 2-1, 2-2, 2-5 described below.
  • the second type of physical layer process 2 is as follows: After satisfying the trigger condition (such as detecting and confirming RLF), the terminal waits for switching back to the local cell mode 1 mode within the set time.
  • the physical resources allocated for the current scheduling are not all released, but the related resources are reserved for use by the D2D terminal to continue to transmit the current scheduling related data after switching back to the local cell mode 1 mode.
  • the physical resources occupied by the interrupted scheduled data may be released, while the physical resources allocated for the data that has not been transmitted by the interrupted scheduling are reserved.
  • the second type of physical layer process 2 can be performed, for example, by implementations 2-3, 2-4 described below.
  • physical layer process 2 There may be multiple implementations of the physical layer process 2. The following five general implementations are described: physical layer process 2-1, physical layer process 2-2, physical layer process 2-3, physical layer process 2-4, and physical layer process 2-5.
  • the D2D terminal releases all the physical resources allocated by the interrupted scheduling when mode 1 is switched to mode 2 (that is, releases the physical resources occupied by the interrupted current scheduled transmission).
  • the physical resource that is currently scheduled to be transmitted but not actually transferred is allocated, and all data currently scheduled is retained, all configurations related to mode 1 transmission are cleared, and the interrupted current is resent in mode 2. All data scheduled.
  • the D2D terminal releases all the physical resources allocated by the interrupted scheduling when the mode 1 is switched to the mode 2, and retains the data that has not been transmitted in the current scheduling, and discards all the data that has been transmitted in the current scheduling. Data, and clear the relevant configuration of mode 1 transmission, and transfer the data that is currently not scheduled to be transferred to mode 2 for transmission.
  • the Mode1 transmission is suspended, the related resources allocated by the current scheduling are reserved, and then the cell reselection result is waited for handover back to the local cell, and then the previously scheduled related resources are used to continue transmission. Finished data.
  • the D2D terminal releases the physical resources occupied by the interrupted current scheduled transmission when the mode 1 is disconnected, and retains the data allocation that is about to be transmitted but not actually transmitted.
  • the physical resources are reserved for subsequent handover back to the local cell mode 1 mode to continue to transmit the untransmitted data; the mode 1 related configuration is retained; and the data of the current scheduling has been discarded, and the current interrupt that is interrupted is not transmitted.
  • the physical layer process 2-4 is similar to the physical layer process 2-3, except that during the suspension mode 1 transmission, the related resources allocated by the current scheduling are not retained, but after waiting for the cell reselection result to be switched back to the local cell, Re-apply resources to transfer data that has been interrupted by the interrupted schedule.
  • the D2D terminal releases the physical resources occupied by the interrupted scheduled transmission, and if the physical data that is to be transmitted but not actually transmitted is also allocated physical resources, it is also required to be Release, and retain all data (or data that has not yet been transmitted) of the interrupted scheduled transmission for a period of time, waiting for reconnection to the current cell within this time.
  • the D2D terminal reconnects to the current cell during this time, re-apply a new scheduling grant to the current cell eNB, and retransmit all the data of the previously interrupted scheduling (or not yet transmitted) under the new scheduling grant applied for. The data). If the D2D terminal cannot reconnect to the current cell and return to mode 1 mode during this time, the data is discarded and the corresponding mode 1 transmission configuration is discarded, and the interrupted data is no longer transmitted.
  • the D2D terminal releases the physical resources occupied by the interrupted scheduled transmission, and if the data that is to be transmitted but not actually transmitted is also The physical resource is allocated, and it needs to be released, and the untransferred data of the interrupted scheduled transmission is retained for a period of time, and it is waiting for reconnection to the current cell within this time.
  • the difference from the process 2-4 is that the D2D terminal also attempts to switch to mode 2 while waiting for the cell reselection result. If the D2D terminal successfully switches to transmission mode 2, then in mode 2, the data of the interrupted scheduling that has not been completed continues to be transmitted while continuing to wait for the cell reselection result.
  • the mode 2 transmission is stopped, and the resources allocated in the mode 2 transmission (including the resources occupied by the already transmitted data and the resources allocated for the untransmitted data) are released, and the interrupted scheduling is discarded so far.
  • the completed data has been transferred, and the interrupted schedule is still not transmitted.
  • the interrupted current scheduling uncompleted data is transferred to the mode 1 transmission, and if the cell does not return to the local cell within the waiting time, the interrupted current is discarded. All data scheduled, no longer transmitted.
  • the D2D terminal fails to successfully switch to the mode 2 mode transmission after the current scheduling is interrupted before the cell reselection re-accesses to the same cell that was previously accessed, the D2D terminal retains the data that has not been transmitted yet. The data is transmitted and waits for the cell reselection result to be switched back to the cell. If the mode 1 is successfully switched back within the set time, the interrupted unscheduled data is transferred back to mode 1 to continue the transmission (in this case, a new scheduling authorization needs to be applied), if it is set If the cell does not return to the cell within the waiting time, all the data of the interrupted scheduling is discarded, and the data is no longer transmitted.
  • FIG. 1 shows a flow chart of a method 1000 in accordance with a first embodiment of the present invention.
  • the D2D terminal in the network coverage usually adopts the D2D communication mode under network scheduling and control, that is, mode 1.
  • Method 1000 begins when the D2D terminal is in mode 1 transmission.
  • step S1100 the D2D terminal detects the network condition and reports the detected network condition to the base station to assist the base station to release the physical resources scheduled to the terminal in time when the transmission is interrupted.
  • step S1100 may adopt any of the following two modes.
  • the D2D terminal will report to the eNB the current wireless link connection status between the D2D terminal and the base station, that is, whether the network is still in a normal connection state.
  • the eNB will determine whether the resource continues to be scheduled or released according to the reporting status of the D2D terminal.
  • the physical layer process will be subject to the following conditions Triggered in case of partial satisfaction:
  • the D2D transmitting terminal is in network scheduling
  • the BSR data that the UE requests to transmit in the current scheduling is not transmitted.
  • the current channel measurement (such as RSRP or RSRQ) is lower than a certain threshold.
  • the physical layer procedure 1-1 can be triggered if both conditions 1, 2 are satisfied, for example, periodically during mode 1 transmission. Alternatively, the physical layer process 1-1 may be triggered if the above conditions 1, 2, and 3 are simultaneously satisfied.
  • the physical layer process 1-1 is that the D2D transmitting terminal reports the current network connection status to the network under the above trigger condition, that is, whether the current D2D transmitting terminal is in a normal connection state with the network.
  • the reported information may be carried in the RRC signaling (for example, directly carried in the content of the SR or the BSR), or carried in the MAC CE, or carried in the uplink control information (UE).
  • the D2D terminal will report the channel measurement value (such as RSRP or RSRQ) of the current cellular network of the D2D terminal to the eNB.
  • the eNB will decide to continue scheduling or releasing resources according to such reporting conditions of the D2D terminal.
  • the physical layer process 1-2 can be triggered if the following conditions are partially met:
  • the D2D transmitting terminal is in network scheduling
  • the BSR data that the UE requests to transmit in the current scheduling is not transmitted.
  • the current channel measurement (such as RSRP or RSRQ) is lower than a certain threshold.
  • the physical layer process 1-2 can be triggered if the conditions 1, 2 are simultaneously satisfied. Alternatively, the physical layer process 1-2 may be triggered if the above conditions 1, 2, and 3 are simultaneously satisfied. In the latter case, if the channel measurement value is lower than the set threshold, the D2D transmitting terminal is triggered to report the D2D transmission mode selection related information to the network; instead, if the channel measurement value is higher than the set threshold, the D2D transmission is not triggered. The terminal reports the D2D transmission mode selection related information to the network.
  • the physical layer process 1-2 is that the D2D transmitting terminal reports the current cellular network measurement value, that is, the current channel measurement value, to the network under the above trigger condition.
  • the reported information may be carried in the RRC, or carried in the MAC CE, or carried in the uplink control information (UE).
  • step S1200 if the detected network condition satisfies the trigger condition of the data reception occurrence interrupt, the D2D retains the data to be transmitted of the interrupted transmission, and executes the slave mode 1 Switch to mode 2 to send the retained data in mode 2.
  • the D2D if the detected network condition satisfies the trigger condition for the data reception interrupt, D2D retains all data to be transmitted for the interrupted transmission, and after successfully switching to mode 2, resends the mode 2 Interrupted transmission of all data to be sent.
  • the D2D if the detected network condition satisfies the trigger condition for the data reception interruption, the D2D retains the data that has not been transmitted by the interrupted transmission, without retaining the already transmitted data, and successfully switches to the mode. After 2, in the mode 2, the data that has not been transmitted in the transmission is continuously transmitted. Step S1200 will implement physical layer process 2.
  • the trigger condition for the interruption of data reception may be that the current network condition indicates that the RLF has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell reselection process timer T301 or T311 is started.
  • a more aggressive trigger condition for interrupting transmission may also be that the current network condition indicates that a radio link failure has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell switching process N310 counter is full and the T310 timer is started (as shown in Figure 12-2-a, Figure 12-2-b, Figure 12-2-c, Figure 12-2-d).
  • Step S1200 can be implemented, for example, by physical layer process 2-1 or by physical layer process 2-2, which will be described in detail below. Method 1000 then ends.
  • FIG. 2 shows a flow diagram of one particular implementation 1000A of method 1000 in accordance with a first embodiment of the present invention.
  • Step S1100a is the same as step S1100. I will not repeat them here.
  • step S1202a the D2D terminal determines whether the detected network condition satisfies the trigger condition of the data reception occurrence interruption, for example, whether or not the RLF has occurred. If the trigger condition is satisfied, the process proceeds to step S1204a, otherwise returns to step S1100a.
  • step S1204a the physical resources occupied by the interrupted transmission that has been completed by the current schedule are released, and if the data that is to be transmitted but not actually transmitted is also allocated physical resources, it needs to be released.
  • step S1206a all data required to be transmitted by the interrupted current schedule is retained, including data that has been transferred.
  • step S1208a all configurations related to mode 1 transmission are cleared.
  • step S1210a it is determined whether the network configuration allows the terminal to transmit in the mode 2 mode. If so, proceeding to step S1212a; otherwise, proceeding to step S1218a, discarding all data of the currently scheduled interrupt, without transmitting the data.
  • step S1212a mode 1 to mode 2 switching is attempted within the set time.
  • step S1214a it is determined whether the D2D terminal successfully switches to mode 2 within the set time. If successful, proceeding to step S1216a; otherwise proceeding to step S1218a, discarding all data of the interrupted schedule without transmitting the data.
  • the terminal resends all data of the scheduling in the mode 2 transmission mode (including data that has been transmitted before the current scheduling is interrupted and data that has not been transmitted yet). It should be noted that the resources used by the terminal in mode 2 are obtained through competition rather than being scheduled by the base station.
  • Method 1000A then ends.
  • FIG. 3 shows a flow diagram of another specific implementation 1000B of method 1000 in accordance with a first embodiment of the present invention.
  • Step S1100b is the same as step S1100. I will not repeat them here.
  • method 1000B describe the detailed steps of physical layer process 2-2.
  • step S1202b the D2D terminal determines whether the detected network condition satisfies the trigger condition of the data reception occurrence interruption, for example, whether or not the RLF has occurred. If the trigger condition is satisfied, the process proceeds to step S1204b, otherwise returns to step S1100b.
  • step S1204b the physical resources occupied by the transmission whose interrupted scheduling has been completed are released, and if the physical data that is to be transmitted but not actually transmitted is also allocated, it is also required to be released.
  • step S1206b the interrupted scheduled untransferred data is retained, and the data that has been transmitted in the current schedule is discarded.
  • step S1208b all configurations related to mode 1 transmission are cleared.
  • step S1210b it is determined whether the network configuration allows the terminal to transmit in the mode 2 mode. If so, proceeding to step S1212b; otherwise, proceeding to step S1218b, discarding all data of the interrupted schedule without transmitting the data.
  • step S1212b mode 1 to mode 2 switching is attempted within the set time.
  • step S1214b it is determined whether the D2D terminal successfully switches to mode 2 within the set time. If successful, proceeding to step S1216b; otherwise proceeding to step S1218b, discarding all data of the interrupted schedule without transmitting the data.
  • the terminal continues to transmit the interrupted scheduled untransmitted data in the mode 2 transmission mode (data that has been transmitted in mode 1 before the current schedule is interrupted is not retransmitted).
  • Method 1000B then ends.
  • FIG. 4 shows a schematic block diagram of a D2D terminal 100 in accordance with a first embodiment of the present invention.
  • the terminal 100 can include a detection device 110, a reporting device 120, a mode switching device 130, a data transmission device 140, and the like.
  • Detection device 110 may detect network conditions during transmission in D2D mode 1.
  • the reporting device 120 reports the detected network conditions to the base station to assist the base station to release the physical resources scheduled to the terminal in time when the transmission is interrupted.
  • the mode switching means 130 retains the data to be transmitted by the interrupted transmission and performs the switching from mode 1 to mode 2 to transmit the mode 2 in the case where the detected network condition satisfies the trigger condition of the data reception occurrence interruption. Reserved data.
  • the retained data may include all data to be transmitted by the interrupted transmission. Alternatively, the retained data may only include data that has not been transmitted by the interrupted transmission, and does not include the transmitted data that has been transmitted by the interrupted transmission.
  • the data transmission device 140 performs the completion of the mode switching device 130, that is, after the mode 1 is successfully switched to the mode 2 within the set time, the retained data is transmitted in the switched mode. For example, in the switched mode, data that has not been transmitted by the interrupted transmission continues to be transmitted, or all data to be transmitted by the interrupted transmission is retransmitted.
  • the D2D terminal 100 can implement the above method 1000 by cooperation of various components, or a specific implementation thereof 1000A or 1000B.
  • the detecting device 110 and the reporting device 120 may be configured to implement the above-described step S1100, or S1100a, or S1100b.
  • the mode switching device 130 and the retransmission or retransmission device 140 may be configured to complete step S1200 in the step method 1000, or configured to complete the operation of the physical layer process 2-1, or configured to complete the operation of the physical layer process 2-2, I will not repeat them here.
  • FIG. 5 shows a flow chart of a method 2000 in accordance with a second embodiment of the present invention.
  • the D2D terminal in the network coverage usually adopts the D2D communication mode under network scheduling and control, that is, mode 1.
  • Method 2000 begins when the D2D terminal is in mode 1 transmission.
  • step S2100 the D2D terminal detects the network condition and reports the detected network condition to the base station to assist the base station to release the physical resources scheduled to the terminal in time when the transmission is interrupted.
  • Step S2100 is similar to step S1100 in the method 1000, and details are not described herein again.
  • step S2200 if the detected network condition satisfies the trigger condition of the data reception occurrence interruption, the data that has not been transmitted by the interrupted transmission is retained, and mode 1 is suspended until the cell reselection is successful.
  • step S2300 if the reselected cell is the same as the original cell accessed by the terminal before the radio link failure occurs, the suspended mode 1 is resumed to continue transmitting the data of the reserved interrupted transmission that has not been transmitted.
  • Step S2200 and step S2300 will implement physical layer process 2.
  • the trigger condition for the data reception interruption in the step S2200 may be that the current network condition indicates that the RLF has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell reselection process timer T301 or T311 is started.
  • a more aggressive trigger condition for interrupting transmission may also be that the current network condition indicates that a radio link failure has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell switching process N310 counter is full and the T310 timer is started.
  • Steps S2200 and S2300 can be implemented, for example, by physical layer process 2-3 or by physical layer process 2-4, which will be described in detail below. Method 2000 then ends.
  • FIG. 6 shows a flow diagram of one particular implementation 2000A of method 2000 in accordance with a second embodiment of the present invention.
  • Step S2100a is the same as step S2100. I will not repeat them here.
  • step S2202a the D2D terminal determines whether the detected network condition satisfies the trigger condition of the data reception occurrence interruption, for example, whether or not the RLF has occurred. If the trigger condition is satisfied, the process proceeds to step S2204a, otherwise returns to step S2100a.
  • step S2204a the physical resources occupied by the interrupted transmission that has been completed by the current scheduling are released, and the physical resources allocated for the data that is to be transmitted but not actually transmitted are reserved, and are reserved for subsequent handover back to the local mode 1 mode. Transfer the unused data for use.
  • step S2206a the interrupted current scheduled untransmitted data is retained, and the data that has been transmitted in the current schedule is discarded;
  • step S2208a if the network allows the terminal to transmit in the mode 2 mode, it attempts to switch back to the home cell within the set time.
  • step S2210a it is determined whether the D2D terminal successfully switches back to the own cell within the set time. If the cell is successfully switched back to the current cell within the set time period, the process proceeds to step S2212a, otherwise to step S2214a.
  • step S2212a the D2D terminal re-switches back to Mode1, and continues to transmit the interrupted scheduled untransferred data in the mode 1 by using the previously reserved physical resources that are to be transmitted but not actually transmitted. (Data that has been transferred in mode 1 before the current schedule is interrupted is not resent).
  • step S2214a the D2D terminal discards all data of the interrupted schedule without transmitting the data.
  • Method 2000A then ends.
  • FIG. 7 shows a flow diagram of another specific implementation 2000B of method 2000 in accordance with a second embodiment of the present invention.
  • Step S2100b is the same as step S2100. I will not repeat them here.
  • step S2202b the D2D terminal determines whether the detected network condition satisfies the trigger condition of the data reception occurrence interruption, for example, whether or not the RLF has occurred. If the trigger condition is satisfied, the process proceeds to step S2204b, otherwise returns to step S2100b.
  • step S2204b the physical resources occupied by the transmission whose interrupted scheduling has been completed are released, and if the data that is to be transmitted but not actually transmitted is also allocated physical resources, it needs to be released.
  • step S2206b the data of the current scheduled untransmission that is interrupted is retained, and discarded when The completed data has been transferred in the pre-scheduling.
  • step S2208b an attempt is made to switch back to the home cell within the set time.
  • step S2210b it is determined whether the D2D terminal successfully switches back to the own cell within the set time. If the cell is successfully switched back to the current cell within the set time period, the process proceeds to step S2212b, otherwise, the process proceeds to step S2214b.
  • step S2212b the D2D terminal switches back to Mode1 and re-applies a new authorization to the network to transmit the previously unscheduled scheduled untransmissioned data (the previously interrupted scheduled transmitted data is no longer resent) ).
  • step S2214b the D2D terminal discards all data of the interrupted schedule without transmitting the data.
  • Method 2000B then ends.
  • FIG. 8 shows a schematic block diagram of a D2D terminal 200 in accordance with a second embodiment of the present invention.
  • the terminal 200 can include a detection device 210, a reporting device 220, a suspending device 230, a recovery device 240, and the like.
  • Detection device 210 can detect network conditions during transmission in D2D mode 1.
  • the reporting device 220 reports the detected network conditions to the base station to assist the base station to release the physical resources scheduled to the terminal in time when the transmission is interrupted.
  • the suspending device 230 may be configured to retain the data that has not been transmitted by the interrupted transmission if the detected network condition satisfies the trigger condition for the data reception interruption, and suspend mode 1 until the cell reselection is successful.
  • the recovery device 240 may be configured to resume the suspended mode 1 to continue transmitting the reserved interrupted transmission that has not been sent if the reselected cell is the same as the original cell accessed by the terminal before the radio link failure occurs. data.
  • the D2D terminal 200 can implement the above method 2000 by cooperation of various components, or its specific implementation 2000A or 2000B.
  • the detecting device 210 and the reporting device 220 may be configured to implement the above-described step S2100, or S2100a, or S2100b.
  • the suspending device 230 and the recovery device 240 respectively perform the operations of steps S2200 and S2300 in the step method 2000.
  • Figure 9 shows a flow chart of a method 3000 in accordance with a third embodiment of the present invention.
  • the D2D terminal in the network coverage usually adopts the D2D communication mode under network scheduling and control, that is, mode 1.
  • Method 3000 begins when the D2D terminal is in mode 1 transmission.
  • step S3100 the D2D terminal detects the network condition and reports the detected network condition to the base station to assist the base station to release the physical resources scheduled to the terminal in time when the transmission is interrupted.
  • Step S2100 is similar to step S1100 in the method 1000, and details are not described herein again.
  • step S3200 if the detected network condition satisfies the trigger condition of the data reception occurrence interrupt or the command to switch to the mode 2 is received from the network, the mode 1 transmission is suspended, the data that has not been transmitted by the interrupted transmission is retained, and execution is performed. Switching from mode 1 to mode 2 to transmit the remaining unsent data in mode 2.
  • the method 3000 may further include step S3300.
  • step S3300 if cell reselection occurs during mode 2 transmission, and the reselected cell is the same as the original cell accessed by the terminal before the radio link failure occurs, the mode 2 transmission is suspended, and the interrupted mode is retained. 2 Transfer data that has not yet been transmitted, and perform a switch from mode 2 to mode 1 to transfer the data that has not been transmitted in mode 2, which continues to be interrupted in mode 1.
  • the method 3000 may further include step S3400.
  • step S3400 if the handover from mode 1 to mode 2 is not successful within a predetermined time, and the terminal reselects to the original cell that was accessed before the radio link failure occurs, then return to the mode 1 to transmit the reserved Unsent data.
  • Step S3200 and optional steps S3300 and S3400 will implement physical layer process 2.
  • the trigger condition for the data reception interrupt in step S3200 may be that the current network condition indicates that the RLF has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell reselection process timer T301 or T311 is started.
  • a more aggressive trigger condition for interrupting transmission may also be that the current network condition indicates that a radio link failure has occurred.
  • the triggering time point of the physical layer process 2 may be after the cell switching process N310 counter is full and the T310 timer is started (as shown in Figure 12-2-a, Figure 12-2-b, Figure 12-2-c, Figure 12-2-d).
  • Step S3200 and optional steps S3300 and S3400 may pass, for example, through physical layer procedures 2-5, which will be described in detail below with reference to FIG. Then, method 3000 ends.
  • Figure 10 illustrates a specific implementation of a method 3000 in accordance with a third embodiment of the present invention. 3000A flow chart.
  • Step S3100a is the same as step S3100. I will not repeat them here.
  • step S3202a the D2D terminal determines whether the detected network condition satisfies the trigger condition of the data reception occurrence interruption, for example, whether or not the RLF has occurred. If the trigger condition is satisfied, it proceeds to step S3204a, otherwise returns to step S3100a.
  • step S3204a If a command to switch to mode 2 is received from the network in step S3201a, it also proceeds to step S3204a.
  • step S3204a the D2D terminal releases the physical resources occupied by the interrupted scheduled transmission, and the physical resources that are to be transmitted but not actually transmitted are also allocated if they are also allocated physical resources.
  • step S3206a the D2D terminal retains the interrupted current scheduled untransmitted data, discarding the data that has been transmitted in the current schedule.
  • step S3208a if the network allows the terminal to transmit in the mode 2 mode, it attempts to switch back to the local cell within the set time, otherwise it continues to wait until the cell reselection set time period is entered, and the cell is tried within the time period. Re-election.
  • step S3210a it is determined whether the D2D terminal successfully switches to mode 2 within the set time. If successful, proceeding to step S3212a, otherwise proceeding to step S3232a, continuing to wait until a cell reselection set time period is entered, during which time cell reselection is attempted.
  • step S3212a the D2D terminal will in turn continue to transmit the interrupted current scheduled untransmitted data in mode 2. And try to switch back to the community during or after this period of time.
  • step S3214a while mode 2 is being transmitted, it is determined whether the D2D terminal successfully switches back to the own cell within the set time period.
  • the set time period for attempting to switch back to the home cell can be determined from the acknowledgment that RLF occurs and attempts to switch from mode 1 transmission to mode 2, and the termination time can be configured in several ways. The specific configuration of the time period for attempting to switch back to the local cell will be described in detail later. Referring to FIG. 12-1-a to FIG. 12-1-d. If the cell is successfully switched back to the current cell within the set time period, the process proceeds to step S3218a, otherwise to step S3240a.
  • step S3218 mode 2 transmission is stopped, the D2D terminal reserves the data that has not been transmitted so far in the scheduling, discards the data that has been transmitted in the scheduling, and clears all configurations related to mode 2. Then, it proceeds to step S3250.
  • step S3232a an attempt is made to switch back to the home cell during the period in which the cell reselection is set.
  • step S3234a it is determined whether the D2D terminal successfully switches back to the own cell within the set time. If the cell is successfully switched back to the current cell within the set time period, the process proceeds to step S3250a, otherwise to step S3240a.
  • step S3250a the D2D terminal re-switches back to Mode1, and continues to transmit the interrupted data of the untransformed completion of the current scheduling in mode 1. (The data that has been transmitted in mode 1 before the current scheduling is interrupted is no longer re-updated. send).
  • step S3240 the D2D terminal discards all data currently reserved, and no longer transmits the currently scheduled data.
  • method 3000A ends.
  • FIG. 11 shows a schematic block diagram of a D2D terminal 300 in accordance with a third embodiment of the present invention.
  • the terminal 300 can include a detecting device 310, a reporting device 320, a receiving device 330, and a mode switching device 340.
  • the terminal 300 may further include a recovery device 350 or the like.
  • Detection device 310 can detect network conditions during transmission in D2D mode 1.
  • the reporting device 320 reports the detected network conditions to the base station to assist the base station to release the physical resources scheduled for the terminal in time when the transmission is interrupted.
  • Receiving device 330 can receive commands from the network, such as a command to switch to mode 2 transmission.
  • the mode switching means 340 may be configured to suspend the mode 1 transmission if the detected network condition satisfies the trigger condition for the data reception interruption or the command to switch to the mode 2 from the network, and retain the data that has not been transmitted by the interrupted transmission. And attempting to switch to mode 2 within the set time A, and performing a switch from mode 1 to mode 2 to transmit the retained data that has not been transmitted in mode 2.
  • the mode switching device 340 is also configured to transmit the retained data that has not been transmitted in mode 2 in the case of successful switching to mode 2.
  • the recovery device 350 may be further configured to: after the initial mode 1 transmission interruption (such as the RLF occurs), including the set time B including attempting to switch to mode 2 and successfully switching to mode 2 and during mode 2 transmission
  • the cell performs cell reselection to try to reselect the original access cell and return to mode 1. If cell reselection occurs during mode 2 transmission, and the reselected cell is the same as the original cell that the terminal accessed before the radio link failure occurs, the mode 2 transmission is aborted and the reservation is interrupted. Mode 2 transmits data that has not yet been transmitted, and performs a switch from mode 2 to mode 1 to transfer the unsent data in mode 2, which continues to be interrupted in mode 1.
  • the recovery device 350 may be configured to return to mode 1 if the handover from mode 1 to mode 2 is not successful within a predetermined time and the terminal reselects to the original cell that was accessed before the radio link failure occurred. Send the remaining data that has not been sent.
  • an attempt is made to switch back to the set time of mode 1 (ie, set time B), and the timing relationship between the set time (ie, set time A) and the attempt to switch back to mode 2 may exist.
  • the timing relationship between the set times A and B will be described in detail below by taking the mode switching or recovery attempt starting at the RLF occurrence time as an example, referring to FIG. 12-1-a to FIG. 12-1-d.
  • the set time B can be set to start at the time when the transmission interruption occurs, and the duration is less than the set time A, that is, end at a certain time point during the attempt to switch to the mode 2 after the interruption occurs (as shown in Fig. 12-1-a).
  • the D2D terminal 300 can implement the above method 3000 by cooperation of various components, or a specific implementation thereof 3000A.
  • the detecting means 310, the reporting means 320, the mode switching means 340 and the recovery means 3500 respectively perform the operations of the corresponding steps in the step method 3000A.
  • the apparatus of the present invention and its components can be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, and the like. It can also be implemented by software executed by various types of processors, or by a combination of the above hardware circuits and software.

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Abstract

本发明公开了在D2D通信系统中在模式1（Mode 1）和模式2（Mode2）之间切换时的资源释放和再次利用机制。根据本发明实施例的方法，包括了：在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；以及如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输要发送的未传完的数据或本次调度需传输的所有数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的数据；或者等待重新接入本小区切换回模式1，以在模式1下发送所保留的数据。本发明的方法可以提高D2D通信系统中对资源的利用率，实现更大的网络性能增益。

Description

D2D通信终端及其通信方法 技术领域
本发明总体上涉及设备到设备(D2D)通信。具体地，涉及在D2D通信系统中在模式1(Mode 1)和模式2(Mode 2)之间切换时的资源释放和再次利用机制。
背景技术
终端直连通信(D2D：Device to Device)技术是指两个对等的用户节点之间直接进行通信的一种通信方式。直连通信技术在很多现在3GPP尚未标准化的领域得到非常关键的应用。包括近年来学术界持续研究的非蜂窝工作模式Ad hoc中的P2P(Peer to Peer)，以及一直以来都具有巨大潜在业务需求的杀手级应用--物联网中的M2M(Machine to Machine)。在这种由终端直连通信用户组成的集中或分布式网络中，每个用户节点都能发送和接收信号并且可能具有自动路由(转发消息)的功能。承载其通信所用的物理资源可以由网络配置，也可以由各个直连通信的终端之间的竞争获得。让蜂窝系统中的用户设备直接进行通信而不通过基站进行转接是一种观念的革新。显然，移动传播环境的天然衰减特性以及用户较低的发射天线，使得直接进行相互通信的两个用户设备具有相对较小的干扰区域。在这种场景下，物理隔离(比如信号衰减程度)达到一定程度的用户都可以共享相同的资源(空间、时间、频率、码字等)而不会引起相互之间的严重干扰。直观上看，每个小区中可以有数量可观的用户进行直连通信，在蜂窝网络下引入直连通信技术可以在很大程度上提高系统资源的空间复用效率，这样就大大缓解了网络资源的调度压力。同时，这些终端直连通信服务是在网络的配置下进行的，不仅是对现有蜂窝系统更加有效利用空口资源的一个有效补充，而且可以把各种物理设备纳入到这个连接体系中，使物联网、车联网等业务有了在3GPP蜂窝网框架下实现的可能。同时，由于蜂窝业务只能运行于蜂窝网覆盖地区，而在没有网络覆盖的地区，终端直连通信业务也能够在无需基站辅助的条 件下独立工作，这就为诸如灾害地区(诸如地震、洪灾等造成网络彻底瘫痪)的及时救援提供了有力的手段，这是对现有蜂窝业务非常有力的补充。有鉴于此，3GPP内一直在推进终端直连通信的标准化。早在2013年初在马耳他举办的RAN1第72次会议上，3GPP就已决定对终端直连通信技术进行研究，并且于2014年3月在福冈举办的RAN第63次全会上通过了在LTE Rel-12对终端直连通信服务进行标准化的工作议题。LTE Rel-12标准将支持D2D业务。而在D2D通信过程中，在不同的网络覆盖情况下，需要不同的D2D传输模式，比如在网络覆盖范围内通常会采用网络调度与控制下的D2D通信模式，即模式1，而在非网络覆盖条件下会采用非网络调度与控制下的D2D通信模式，即Mode 2。在网络覆盖条件或网络信号强度改变时，D2D通信模式会发生切换。例如，在网络覆盖条件或网络信号强度变差时，会从模式1切换到模式2。由于D2D模式切换而中断的传输所占用的资源若不能及时释放将造成资源的浪费。从下面的表1-1和表1-2(其分别对应3GPP TS36.321中的表6.1.3.1-1和表6.1.3.1-2)中可以看出，当缓存状态报告(BSR)的待传输数据缓存大小很大时，或者D2D调度的一个传输周期很长时，由于D2D模式切换引起的传输中断造成的未及时释放或利用的传输资源将非常可观。
索引 缓存大小值(Bs value)[字节] 索引 缓存大小值(Bs value)[字节]
0 BS＝0 32 1132＜BS＜＝1326
1 0＜BS＜＝10 33 1326＜BS＜＝1552
2 10＜BS＜＝12 34 1552＜BS＜＝1817
3 12＜BS＜＝14 35 1817＜BS＜＝2127
4 14＜BS＜＝17 36 2127＜BS＜＝2490
5 17＜BS＜＝19 37 2490＜BS＜＝2915
6 19＜BS＜＝22 38 2915＜BS＜＝3413
7 22＜BS＜＝26 39 3413＜BS＜＝3995
8 26＜BS＜＝31 40 3995＜BS＜＝4677
9 31＜BS＜＝36 41 4677＜BS＜＝5476
10 36＜BS＜＝42 42 5476＜BS＜＝6411
11 42＜BS＜＝49 43 6411＜BS＜＝7505
12 49＜BS＜＝57 44 7505＜BS＜＝8787
13 57＜BS＜＝67 45 8787＜BS＜＝10287
14 67＜BS＜＝78 46 10287＜BS＜＝12043
15 78＜BS＜＝91 47 12043＜BS＜＝14099
16 91＜BS＜＝107 48 14099＜BS＜＝16507
17 107＜BS＜＝125 49 16507＜BS＜＝19325
18 125＜BS＜＝146 50 19325＜BS＜＝22624
19 146＜BS＜＝171 51 22624＜BS＜＝26487
20 171＜BS＜＝200 52 26487＜BS＜＝31009
21 200＜BS＜＝234 53 31009＜BS＜＝36304
22 234＜BS＜＝274 54 36304＜BS＜＝42502
23 274＜BS＜＝321 55 42502＜BS＜＝49759
24 321＜BS＜＝376 56 49759＜BS＜＝58255
25 376＜BS＜＝440 57 58255＜BS＜＝68201
26 440＜BS＜＝515 58 68201＜BS＜＝79846
27 515＜BS＜＝603 59 79846＜BS＜＝93479
28 603＜BS＜＝706 60 93479＜BS＜＝109439
29 706＜BS＜＝826 61 109439＜BS＜＝128125
30 826＜BS＜＝967 62 128125＜BS＜＝150000
31 967＜BS＜＝1132 63 BS＞150000
表1-1：BSR缓存大小等级
索引 缓存大小值(Bs value)[字节] 索引 缓存大小值(Bs value)[字节]
0 BS＝0 32 4940＜BS＜＝6074
1 0＜BS＜＝10 33 6074＜BS＜＝7469
2 10＜BS＜＝13 34 7469＜BS＜＝9185
3 13＜BS＜＝16 35 9185＜BS＜＝11294
4 16＜BS＜＝19 36 11294＜BS＜＝13888
5 19＜BS＜＝23 37 13888＜BS＜＝17077
6 23＜BS＜＝29 38 17077＜BS＜＝20999
7 29＜BS＜＝35 39 20999＜BS＜＝25822
8 35＜BS＜＝43 40 25822＜BS＜＝31752
9 43＜BS＜＝53 41 31752＜BS＜＝39045
10 53＜BS＜＝65 42 39045＜BS＜＝48012
11 65＜BS＜＝80 43 48012＜BS＜＝59039
12 80＜BS＜＝98 44 59039＜BS＜＝72598
13 98＜BS＜＝120 45 72598＜BS＜＝89272
14 120＜BS＜＝147 46 89272＜BS＜＝109774
15 147＜BS＜＝181 47 109774＜BS＜＝134986
16 181＜BS＜＝223 48 134986＜BS＜＝165989
17 223＜BS＜＝274 49 165989＜BS＜＝204111
18 274＜BS＜＝337 50 204111＜BS＜＝250990
19 337＜BS＜＝414 51 250990＜BS＜＝308634
20 414＜BS＜＝509 52 308634＜BS＜＝379519
21 509＜BS＜＝625 53 379519＜BS＜＝466683
22 625＜BS＜＝769 54 466683＜BS＜＝573866
23 769＜BS＜＝945 55 573866＜BS＜＝705666
24 945＜BS＜＝1162 56 705666＜BS＜＝867737
25 1162＜BS＜＝1429 57 867737＜BS＜＝1067031
26 1429＜BS＜＝1757 58 1067031＜BS＜＝1312097
27 1757＜BS＜＝2161 59 1312097＜BS＜＝1613447
28 2161＜BS＜＝2657 60 1613447＜BS＜＝1984009
29 2657＜BS＜＝3267 61 1984009＜BS＜＝2439678
30 3267＜BS＜＝4017 62 2439678＜BS＜＝3000000
31 4017＜BS＜＝4940 63 BS＞3000000
表1-2：BSR扩展缓存大小等级
因此，对于被该切换过程中断的D2D传输所调度的资源，需要定义新的行为，以便高效重用或利用这些被中断的D2D所占用的物理资源。
发明内容
为了实现该目的，本发明提出了在D2D通信系统中在模式1和模式2之间切换时高效利用物理资源的机制。具体地，本发明提出：为了在D2D通信系统中在模式1传输被中断或者进行模式1和模式2之间的切换时高效利用物理资源，可以释放为被中断的传输所调度的全部或部分资源。
根据本发明的第一方面，提供了一种在支持设备到设备(D2D)通信的终端中执行的方法。所述方法可以包括：在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。所述方法还可以包括：如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输(或称“被中断的调度”)要发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的数据。
在一些实施例中，如果终端所报告的网络条件满足数据接收发生中断的触发条件，基站将释放调度给所述终端的被中断的传输的全部资源。
在一些实施例中，数据接收发生中断的触发条件可以是网络条件指示已经发生无线链路故障。在另一些实施例中，数据接收发生中断的触发条件可以是网络条件指示即将或者很可能发生无线链路故障，例如网络条件指示无线链路质量低于预设标准。
在一些实施例中，在从模式1到模式2的切换期间，终端将保留被中断的调度要发送的全部数据。于是，在切换到模式2后，终端将发送全部数据，包括已经在模式1下发送的数据。
在一些实施例中，在从模式1到模式2的切换期间，终端将仅保留被中断的传输还未发送的数据，而丢弃当前调度已经发送的数据。于是，在切换到模式2后，终端将仅发送还未发送的数据。
在一些实施例中，终端向基站报告终端与基站之间的无线链路连接状况作为所述网络条件。可选地，在另一些实施例中，终端向基站报告终端处的信道测量值作为所述网络条件。
在一些实施例中，终端在模式1通信中并且在BSR指示的当前调度需要传输的数据还未传输完成期间，将定期地或不定期地向基站发送检测到的网络条件。或者优选地，终端仅在当前网络条件低于阈值时，例如当前信道测量值低于阈值时，才执行。
根据本发明的第二方面，提供了一种在支持设备到设备“D2D”通信的终端中执行的方法。该方法可以包括：在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输(或称“被中断的调度”)还未发送的数据，并且挂起模式1直到小区重选成功；以及，如果重选到的小区与终端在发生无线链路故障前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
在一些实施例中，在挂起模式1时，保留为被中断的传输还未发送的数据分配的物理资源，以留待该终端重新接入原接入小区并恢复模式1时用这些资源续传或重传本次调度待传的数据。
在一些实施例中，在挂起模式1时，不保留为被中断的传输分配的任何物理资源。并且该方法还包括：在恢复模式1时重新申请资源，以使用重新申请的资源继续发送所保留的被中断的传输还未发送的数据。
根据本发明的第三方面，提供了一种在支持设备到设备“D2D”通信的终端中执行的方法。该方法可以包括：在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令， 则中止模式1传输，保留被中断的传输还未发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。
在一些实施例中，该方法还可以包括：如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续被中断的模式2传输还未发送的数据。
在一些实施例中，该方法还包括：如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。通常，在根据本发明的第三方面的实施例中，如果终端所报告的网络条件满足数据接收发生中断的触发条件，则基站会在传输中断时及时释放调度给所述终端的被中断的传输的全部资源。于是，终端在回到模式1下时，如果仍有未发送的数据，则需要针对这些仍未发送的数据，重新申请资源。
根据本发明的第四方面，提供了一种支持设备到设备“D2D”通信的终端。该终端包括：检测装置，配置为在处于D2D模式1传输期间检测网络条件；报告装置，配置为向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；模式切换装置，配置为，在检测到的网络条件满足数据接收发生中断的触发条件的情况下，保留被中断的传输要发送的数据，以及执行从模式1到模式2的切换；以及数据传输装置，在模式切换成功后在切换到的模式2下续传或重传所保留的数据。
根据本发明的第五方面，提供了一种支持设备到设备“D2D”通信的终端。该终端包括：检测装置，配置为在处于D2D模式1传输期间检测网络条件；报告装置，配置为：向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；挂起装置，配置为，如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输还未发送的数据，并且挂起模式1直到小区重选成功；以及恢复装置，配置为：如果重选到的小区与终端在发生无线链路故障 前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
在一些实施例中，挂起装置进一步配置为：在挂起模式1时保留为被中断的传输还未发送的数据分配的物理资源，以留待该终端重新接入原接入小区并恢复模式1时用这些资源续传或重传本次调度待传的数据。
在一些实施例中，挂起装置进一步配置为：在挂起模式1时不保留为被中断的传输分配的任何物理资源。并且该终端还包括资源申请装置，配置为：在恢复模式1时重新申请资源，以使用重新申请的资源继续发送所保留的被中断的传输还未发送的数据。
根据本发明的第六方面，提供了一种支持设备到设备“D2D”通信的终端。该终端包括：检测装置，配置为在处于D2D模式1传输期间检测网络条件；报告装置，配置为向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；接收装置，配置为从网络接收命令；以及，模式切换装置，配置为：如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令，则中止模式1传输，保留被中断的传输还未发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。
在一些实施例中，该终端还包括恢复装置。该恢复装置配置为：如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续发送被中断的传输在恢复回模式1之前仍未传输或还未传完的数据。
在这些实施例中，该恢复装置还配置为：如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。
通过本发明提出的方法，可以在D2D通信终端离开模式1通信时，及时地释放被中断的传输所调度的全部或部分资源以供再次利用。从而 通过本发明提出的方法，可以提高D2D通信系统中对资源的利用率，实现更大的网络性能增益。
附图说明
通过下面结合附图说明本发明的优选实施例，将使本发明的上述及其它目的、特征和优点更加清楚，其中：
图1示出了根据本发明的第一实施例的方法的流程图。
图2示出了根据本发明的第一实施例的方法的一个具体实现的流程图。
图3示出了根据本发明的第一实施例的方法的另一个具体实现的流程图。
图4示出了根据本发明的第一实施例的D2D示意终端。
图5示出了根据本发明的第二实施例的方法的流程图。
图6示出了根据本发明的第二实施例的方法的一个具体实现的流程图。
图7示出了根据本发明的第二实施例的方法的另一个具体实现的流程图。
图8示出了根据本发明的第二实施例的D2D终端的示意框图。
图9示出了根据本发明的第三实施例的方法的流程图。
图10示出了根据本发明的第三实施例的方法的一个具体实现的流程图。
图11示出了根据本发明的第三实施例的D2D终端的示意框图。
图12-1-a示出了在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第一种时序关系，及其整个切换过程的时序关系。
图12-1-b示出了在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第二种时序关系，及其整个切换过程的时序关系。
图12-1-c示出了在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第三种时序关系，及其整个切换过程的时序 关系。
图12-1-d示出了根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第四种时序关系，及其整个切换过程的时序关系。
图12-2-a示出了在模式切换在更激进的条件下触发(即T310启动时开始)时，在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第一种时序关系，及其整个切换过程的时序关系。
图12-2-b示出了在模式切换在更激进的条件下触发(即T310启动时开始)时，在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第二种时序关系，及其整个切换过程的时序关系。
图12-2-c示出了在模式切换在更激进的条件下触发(即T310启动时开始)时，在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第三种时序关系，及其整个切换过程的时序关系。
图12-2-d示出了在模式切换在更激进的条件下触发(即T310启动时开始)时，在根据本发明的第三实施例中尝试切换到模式2与尝试切换回模式1之间的第四种时序关系，及其整个切换过程的时序关系。
在本发明的所有附图中，相同或相似的元素均以相同或相似的附图标记进行标识。
具体实施方式
现在将参考附图来详细描述本发明，附图中示出了本发明的说明性实施例，以使得本领域技术人员能够实现本发明。应该注意：以下附图和示例不意味着将本发明的范围限制到特定的实施例，相反通过互换和组合不同实施例的一些或全部所述或所示元素形成其他实施例也是可能的。此外，在可以使用已知组件来部分或完全实现本发明的特定元素的情况下，将仅描述这些已知组件中为了理解本发明所必需的那部分组件，且将省略对这些已知组件中其他部分的详细描述，以使得本发明更突出。除非本文中另行指出，否则本领域技术人员应该理解：尽管本发明的一些实施例描述为用软件实形式现，但是本发明不受限于此，而是也可以 用硬件、软件和硬件的组合来实现，且反之亦然。除非本文中另行明确声明，否则在本说明书中，不应将示出了单一组件的实施例视为是限制性的，而是本发明意在涵盖包括多个相同组件在内的其他实施例，且反之亦然。此外，本发明包含本文中作为示意所引用的已知组件的当前和将来开发的等价物。
如上文提到的，本发明的目的在于提供在D2D通信系统中在模式1和模式2之间切换时高效利用物理资源的机制。本发明提出了若干机制，用于在模式1和模式2切换时保留和释放因切换而中断的传输所调度的资源中的全部或部分资源，并且介绍了终端(也称为用户设备UE)和基站的相应行为。为了便于理解，本发明将参考3GPP TS 36.321和3GPP TS 36.331协议来进行描述，但是本发明不限于此。
具体地，在D2D通信过程中发生模式1和模式2切换过程时，本发明设计了高效利用资源的两种物理层过程：物理层过程1与物理层过程2。现分别说明如下：
物理层过程1是D2D终端(如UE)在发生无线链路故障(Radio Link Failure，简称RLF)之前基于一定的机制上报其网络情况。基站(如eNB)根据UE上报的网络情况决定该UE的D2D传输模式，及其整个物理层过程涉及的一系列信令。物理层过程1可以有两种可选的实现方式：物理层过程1-1和物理层过程1-2。物理层过程1-1中，D2D终端将会向eNB上报当前该D2D终端与基站之间的无线链路连接状况，即是否网络仍处于正常连接状态。eNB将会根据D2D终端的此种汇报情况决定资源的继续调度或释放。在物理层过程1-2中，D2D终端将会向eNB上报当前该D2D终端所接收到的蜂窝网的信号质量，也即信道测量值(如RSRP或RSRQ)。eNB将会根据D2D终端汇报的信号质量决定终端的D2D传输模式，并决定相应资源的继续调度或释放。此物理层过程1的一种触发条件是：在该D2D发射终端正在网络调度中且该UE申请当前调度需传输的BSR数据未传输完成的条件下触发。例如，UE在正常的模式1通信中并且在当前调度需要传输的数据还未完成期间，可以定期地或不定期地向基站发送检测到的网络情况。物理层过程1的另一种触发条件是：前一种触发条件满足的情况下且当前的信道测量值(如RSRP或RSRQ)低于预 配置的某一阈值的条件下触发。
物理层过程2是D2D终端(如UE)根据当前的网络条件与基站(如eNB)的相应配置，所进行的D2D传输模式切换以及此切换过程中终端继续调度或释放相应资源的物理层过程。物理层过程2规定了在D2D模式切换中D2D终端的若干行为(UE Behaviors)。物理层过程2的触发条件可以是：当前网络条件指示发生了RLF。例如，物理层过程2的触发时间点可以是在小区重选过程计时器T301或T311启动后。或者，物理层过程2的更激进的触发条件可以是：当前网络条件指示即将已经发生无线链路故障。例如，物理层过程2的触发时间点可以是在小区切换过程N310计数器计满、T310计时器启动后(如图12-2-a、图12-2-b、图12-2-c、图12-2-d所示)。T301、T311、T310、N310的含义与3GPP TS36.321中的定义一致，如下面的表2-1和表2-2所示。表2-1和表2-2分别对应3GPP TS36.331中的表7.3和表7.4。
Figure PCTCN2015084206-appb-000001
表2-1
常量 使用
N310 表示接收来自下层的连续“不同步(out-of-sync)”信息的最大数目
N311 表示接收来自下层的连续“同步(in-sync)”信息的最大数目
表2-2
物理层过程2分为两种类型。第一种类型的物理层过程2如下：在满足触发条件(如检测到并确认RLF)后，终端不必等到切换回本小区模式1模式就随即释放为当前调度分配的相关物理资源。第一种类型的物理层过程2例如可以通过下述的实现方式2-1，2-2，2-5来执行。第二种类型的物理层过程2如下：在满足触发条件(如检测到并确认RLF)后，终端在设定时间内等待切换回本小区模式1模式。在此等待期间，不全部释放为当前调度分配的物理资源，而是保留相关资源以留作该D2D终端切换回本小区模式1模式后继续传输当前调度相关数据所用。例如，在等待期间，可以释放被中断的调度已发送的数据所占用的物理资源，而保留为被中断的调度还未发送的数据分配的物理资源。第二种类型的物理层过程2例如可以通过下述的实现方式2-3，2-4来执行。
物理层过程2可以存在多种实现方式。下面概要介绍5种实现方式：物理层过程2-1，物理层过程2-2，物理层过程2-3，物理层过程2-4，和物理层过程2-5。
在物理层过程2-1中，D2D终端会在模式1切换到模式2时释放被中断的调度分配的全部物理资源(也即，释放被中断的当前调度已经完成的传输所占用的物理资源，同时释放当前调度为本来即将传输而实际未传输完成的数据分配的物理资源)，并保留当前调度的所有数据，清空有关模式1传输的所有配置，转而在模式2中重新发送被中断的当前调度的所有数据。
在物理层过程2-2中，D2D终端会在模式1切换到模式2时释放被中断的调度分配的全部物理资源，并保留当前调度未传完的数据，丢弃当前调度中已经传输完成的所有数据，并清空模式1传输的相关配置，并将当前调度未传输完成的数据转到模式2中传输。
在物理层过程2-3中，挂起Mode1传输，保留当前调度分配的相关资源，然后等待小区重选结果为切换回本小区，然后用之前保留的相关资源继续传输被中断的当前调度未传完的数据。在物理层过程2-3中，D2D终端会在切离模式1时，释放被中断的当前调度已经完成的传输所占用的物理资源，而保留为本来即将传输而实际未传输完成的数据分配 的物理资源，留待后续切换回本小区模式1模式下继续传输未传完的这些数据所用；保留模式1相关配置；以及，丢弃当前调度已经完成的数据，而保留被中断的当前调度未传完的剩余数据一段时间，在这段时间之内等待小区重选结果是否会重新连接到当前小区。如果在这段时间内D2D终端重新连接到当前小区，则切换回模式1模式，且之前保留的当前被中断的调度剩下未传完的数据接着在模式1下利用之前保留的为本来即将传输而实际未传输完成的数据分配的物理资源继续传输。如果这段时间内该D2D终端不能重新连接到当前小区并回到模式1模式，则丢弃这些数据与相应的模式1传输配置，对当前被中断调度未传输完成的数据不再进行传输。
物理层过程2-4与物理层过程2-3类似，区别在于：在挂起模式1传输期间，不保留当前调度分配的相关资源，而是在等待小区重选结果为切换回本小区后，重新申请资源来传输被中断的调度未传完的数据。在物理层过程2-4中，D2D终端会释放被中断的调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放，并且保留被中断的调度传输的所有数据(或还未传输的数据)一段时间，在这段时间之内等待是否会重新连接到当前小区。如果这段时间内D2D终端重新连接到当前小区，则重新向当前小区eNB申请新的调度授权，并在申请到的新的调度授权下重新传送之前被中断的调度的所有数据(或还未传输的数据)。如果这段时间内该D2D终端不能重新连接到当前小区并回到模式1模式，则丢弃这些数据与相应的模式1传输配置，对该次被中断的数据不再进行传输。
与物理层过程2-4类似，在物理层过程2-5中，D2D终端会释放被中断的调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放，并且保留被中断的调度传输的还未传输的数据一段时间，在这段时间之内等待是否会重新连接到当前小区。与过程2-4的不同在于，在等待小区重选结果的同时，D2D终端还尝试切换到模式2。如果D2D终端成功切换到传输模式2，则在模式2下继续传输被中断的调度还未完成的数据，同时继续等待小区重选结果。如果在模式2传输期间在某次调度中发生了小区 重选，则停止模式2传输，并且释放在此模式2传输中所分配的资源(包括已经传完的数据占用的资源和为未传完的数据分配的资源)，并丢弃被中断的调度迄今已传输完成的数据，并保留被中断的调度仍未传输发送的数据。若在等待时间内小区重选结果为切换回本小区，则将被中断的当前调度未完成的数据转到模式1中传输，若在等待时间内未回到本小区，则丢弃被中断的当前调度的所有数据，不再传输这些数据。若该D2D终端在小区重选重新接入到之前接入的同一小区之前，当前调度被中断后一直未能成功切换到模式2模式传输，则一直保留当前调度未传输完成的数据，丢弃之前已经传完的数据，并等待小区重选结果是否为切换回本小区。如果在设定时间内成功切换回模式1，则将被中断的调度未完成的数据转回到模式1中继续传输(在该情况下，需要申请新的调度授权)，若在设定的该等待时间内未回到本小区，则丢弃被中断的调度的所有数据，不再传输这些数据。
在不同的RRC配置下，上述物理层过程还会有一些不同表现。
下面参考附图和具体实施例对上述物理过程进行详细描述。下面的描述通常是从D2D终端的角度来描述的，但是不排除对基站的行为的描述。
图1示出了根据本发明的第一实施例的方法1000的流程图。
如前所述，在网络覆盖范围内D2D终端通常会采用网络调度与控制下的D2D通信模式，即模式1。方法1000开始于D2D终端处于模式1传输中。
在步骤S1100中，D2D终端检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。
在步骤S1100中将实现上述物理层过程1，其可以采用如下两种方式中的任一实施方式。
物理层过程1-1的实现方式
D2D终端将会向eNB上报当前该D2D终端与基站之间的无线链路连接状况，即网络是否仍处于正常连接状态。eNB将会根据D2D终端的此种汇报情况决定资源是否继续调度或释放。该物理层过程会在以下条件 部分满足的情况下被触发：
1，该D2D发射终端正在网络调度中；
2，该UE申请当前调度需传输的BSR数据未传输完成；
3，当前的信道测量值(如RSRP或RSRQ)低于配置的某一阈值。
该物理层过程1-1可以在条件1，2同时满足的情况下触发，例如在模式1传输期间定期发送。或者，该物理层过程1-1可以在上述条件1，2，3同时满足的情况下触发。
该物理层过程1-1即为D2D发射终端在上述触发条件下向网络上报当前网络连接状况，即当前D2D发射终端是否与网络处于正常连接状态。所上报的信息可以承载在RRC信令中(例如，直接承载于SR或者BSR的内容中)，或者承载在MAC CE中，或者承载在上行控制信息(UE)中。
物理层过程1-2的实现方式
对于物理层过程1-2，D2D终端将会向eNB上报当前该D2D终端的蜂窝网的信道测量值(如RSRP或RSRQ)。eNB将会根据D2D终端的此种汇报情况决定资源的继续调度或释放。该物理层过程1-2可以在以下条件部分满足的情况下被触发：
1，该D2D发射终端正在网络调度中；
2，该UE申请当前调度需传输的BSR数据未传输完成；
3，当前的信道测量值(如RSRP或RSRQ)低于配置的某一阈值。
与物理层过程1-1类似，该物理层过程1-2可以在条件1，2同时满足的情况下触发。或者，该物理层过程1-2可以在上述条件1，2，3同时满足的情况下触发。在后一情况下，假如下行信道测量值低于设定阈值，则触发D2D发射终端向网络上报D2D传输模式选择相关信息；相反假如下行信道测量值高于设定阈值，则不会触发D2D发射终端向网络上报D2D传输模式选择相关信息。
该物理层过程1-2即为D2D发射终端在上述触发条件下向网络上报当前蜂窝网的测量值，即当前信道测量值。所上报的信息可以承载在RRC中，或者承载在MAC CE中，或者承载在上行控制信息(UE)中。
在步骤S1200中，如果检测到的网络条件满足数据接收发生中断的触发条件，则D2D保留被中断的传输要发送的数据，并且执行从模式1 到模式2的切换，以在模式2下发送所保留的数据。在一些实施例中，如果检测到的网络条件满足数据接收发生中断的触发条件，则D2D保留被中断的传输要发送的全部数据，并且在成功切换到模式2后，在模式2下重新发送被中断的传输要发送的全部数据。而在另一些实施例中，如果检测到的网络条件满足数据接收发生中断的触发条件，则D2D保留被中断的传输还未发送的数据，而不保留已经发送的数据，并且在成功切换到模式2后，在模式2下续传该次传输还未发送的数据。步骤S1200将实现物理层过程2。
数据接收发生中断的触发条件(也即物理层过程2的触发条件)可以是：当前网络条件指示发生了RLF。例如，物理层过程2的触发时间点可以是在小区重选过程计时器T301或T311启动后。或者，中断传输的更激进的触发条件还可以是：当前网络条件指示即将已经发生无线链路故障。例如，物理层过程2的触发时间点可以是在小区切换过程N310计数器计满、T310计时器启动后(如图12-2-a、图12-2-b、图12-2-c、图12-2-d所示)。
步骤S1200例如可以通过物理层过程2-1或者通过物理层过程2-2来实现，其将在下文进行详细描述。然后，方法1000结束。
图2示出了根据本发明的第一实施例的方法1000的一个具体实现1000A的流程图。
同样，方法1000A开始于D2D终端处于模式1传输中。步骤S1100a与步骤S1100相同。在此不再赘述。
方法1000A的后续部分描述了物理层过程2-1的详细步骤。
在步骤S1202a中，D2D终端判断检测到的网络条件是否满足数据接收发生中断的触发条件，例如是否发生了RLF。如果满足触发条件，则前进到步骤S1204a，否则返回步骤S1100a。
在步骤S1204a中，释放被中断的当前调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放。
在步骤S1206a中，保留被中断的当前调度所需传输的所有数据，包括已经传输完成的数据。
在步骤S1208a中，清空有关模式1传输的所有配置。
在步骤S1210a中，判断网络配置是否允许该终端在模式2模式下传输。如果允许，则前进到步骤S1212a；否则，前进到步骤S1218a，丢弃被中断的当前调度的所有数据，而不再传输这些数据。
在步骤S1212a中，在设定时间内尝试模式1到模式2的切换。
在步骤S1214a中，判断在该设定时间内D2D终端是否成功切换到模式2。如果成功，则前进到步骤S1216a；否则前进到步骤S1218a，丢弃被中断的调度的所有数据，而不再传输这些数据。
在S1216a中，该终端在模式2传输模式下重新发送该次调度的所有数据(包括当前调度被中断之前已经传输完成的数据和还未传完的数据)。应该注意，在模式2下该终端使用的资源是通过竞争获得的，而不是由基站调度的。
然后，方法1000A结束。
图3示出了根据本发明的第一实施例的方法1000的另一个具体实现1000B的流程图。
同样，方法1000B开始于D2D终端处于模式1传输中。步骤S1100b与步骤S1100相同。在此不再赘述。
方法1000B的后续部分描述了物理层过程2-2的详细步骤。
在步骤S1202b中，D2D终端判断检测到的网络条件是否满足数据接收发生中断的触发条件，例如是否发生了RLF。如果满足触发条件，则前进到步骤S1204b，否则返回步骤S1100b。
在步骤S1204b中，释放被中断的调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放。
在步骤S1206b中，保留被中断的调度未传输的数据，丢弃当前调度中已经传输完成的数据。
在步骤S1208b中，清空有关模式1传输的所有配置。
在步骤S1210b中，判断网络配置是否允许该终端在模式2模式下传输。如果允许，则前进到步骤S1212b；否则，前进到步骤S1218b，丢弃被中断的调度的所有数据，而不再传输这些数据。
在步骤S1212b中，在设定时间内尝试模式1到模式2的切换。
在步骤S1214b中，判断在该设定时间内D2D终端是否成功切换到模式2。如果成功，则前进到步骤S1216b；否则前进到步骤S1218b，丢弃被中断的调度的所有数据，而不再传输这些数据。
在S1216b中，该终端在模式2传输模式下继续发送被中断的调度的未传输完成的数据(当前调度被中断之前在模式1中已传输完成的数据不再重新发送)。
然后，方法1000B结束。
图4示出了根据本发明的第一实施例的D2D终端100的示意框图。如图所示，终端100可以包括检测装置110，报告装置120，模式切换装置130以及数据传输装置140等等。
检测装置110可以在处于D2D模式1传输期间检测网络条件。
报告装置120向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。
模式切换装置130在检测到的网络条件满足数据接收发生中断的触发条件的情况下，保留被中断的传输要发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的数据。所保留的数据可以包括被中断的传输要发送的全部数据。备选地，所保留的数据可以仅包括被中断的传输还未发送的数据，而不包括被中断的传输已发送的数据。
数据传输装置140在模式切换装置130执行完成，即在设定时间内从模式1成功切换到模式2后，在切换到的模式下发送所保留的数据。例如，在切换到的模式下，继续发送被中断的传输还未发送的数据，或者重传被中断的传输要发送的全部数据。
D2D终端100可以通过各个部件的协作来实现上述方法1000，或其具体实现方式1000A或1000B。检测装置110和报告装置120可以配置为实现上述步骤S1100，或S1100a，或S1100b。模式切换装置130和续传或重传装置140可以配置为完成步骤方法1000中的步骤S1200，或者配置为完成物理层过程2-1的操作，或者配置为完成物理层过程2-2的操作，在此不再赘述。
图5示出了根据本发明的第二实施例的方法2000的流程图。
如前所述，在网络覆盖范围内D2D终端通常会采用网络调度与控制下的D2D通信模式，即模式1。方法2000开始于D2D终端处于模式1传输中。
在步骤S2100中，D2D终端检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。步骤S2100与方法1000中的步骤S1100类似，在此不再赘述。
在步骤S2200中，如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输还未发送的数据，并且挂起模式1直到小区重选成功。
在步骤S2300中，如果重选到的小区与终端在发生无线链路故障前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
步骤S2200和步骤S2300将实现物理层过程2。
与方法1000类似，步骤S2200中的数据接收发生中断的触发条件(也即物理层过程2的触发条件)可以是：当前网络条件指示发生了RLF。例如，物理层过程2的触发时间点可以是在小区重选过程计时器T301或T311启动后。或者，中断传输的更激进的触发条件还可以是：当前网络条件指示即将已经发生无线链路故障。例如，物理层过程2的触发时间点可以是在小区切换过程N310计数器计满、T310计时器启动后。
步骤S2200和S2300例如可以通过物理层过程2-3或者通过物理层过程2-4来实现，其将在下文进行详细描述。然后，方法2000结束。
图6示出了根据本发明的第二实施例的方法2000的一个具体实现2000A的流程图。
同样，方法2000A开始于D2D终端处于模式1传输中。步骤S2100a与步骤S2100相同。在此不再赘述。
方法2000A的后续部分描述了物理层过程2-3的详细步骤。
在步骤S2202a中，D2D终端判断检测到的网络条件是否满足数据接收发生中断的触发条件，例如是否发生了RLF。如果满足触发条件，则前进到步骤S2204a，否则返回步骤S2100a。
在步骤S2204a中，释放被中断的当前调度已经完成的传输所占用的物理资源，而保留为本来即将传输而实际未传输完成的数据分配的物理资源，留待后续切换回本小区模式1模式下继续传输未传完的这些数据所用。
在步骤S2206a中，保留被中断的当前调度未传输的数据，丢弃当前调度中已经传输完成的数据；
在步骤S2208a中，假如网络允许该终端在模式2模式中传输，则在设定时间内尝试切换回本小区。
在步骤S2210a中，判断在设定时间内D2D终端是否成功切换回本小区。如果在设定的时间段内成功切换回本小区，则前进到步骤S2212a，否则前往步骤S2214a。
在步骤S2212a中，该D2D终端重新切换回Mode1，并在模式1下利用之前保留的为本来即将传输而实际未传输完成的数据分配的物理资源，继续发送被中断的调度的未传输完成的数据(当前调度被中断之前在模式1中已传输完成的数据不再重新发送)。
在步骤S2214a中，D2D终端丢弃被中断的调度的所有数据，而不再传输这些数据。
然后，方法2000A结束。
图7示出了根据本发明的第二实施例的方法2000的另一个具体实现2000B的流程图。
同样，方法2000B开始于D2D终端处于模式1传输中。步骤S2100b与步骤S2100相同。在此不再赘述。
方法2000B的后续部分描述了物理层过程2-4的详细步骤。
在步骤S2202b中，D2D终端判断检测到的网络条件是否满足数据接收发生中断的触发条件，例如是否发生了RLF。如果满足触发条件，则前进到步骤S2204b，否则返回步骤S2100b。
在步骤S2204b中，释放被中断的调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放。
在步骤S2206b中，保留被中断的当前调度未传输的数据，丢弃当 前调度中已经传输完成的数据。
在步骤S2208b中，在设定时间内尝试切换回本小区。
在步骤S2210b中，判断在设定时间内D2D终端是否成功切换回本小区。如果在设定的时间段内成功切换回本小区，则前进到步骤S2212b，否则前往步骤S2214b。
在步骤S2212b中，该D2D终端重新切换回Mode1，并且向网络重新申请新的授权以传输之前被中断的调度的未传输完成的数据(之前被中断的调度的已传完的数据不再重新发送)。
在步骤S2214b中，D2D终端丢弃被中断的调度的所有数据，而不再传输这些数据。
然后，方法2000B结束。
图8示出了根据本发明的第二实施例的D2D终端200的示意框图。如图所示，终端200可以包括检测装置210，报告装置220，挂起装置230，恢复装置240等等。
检测装置210可以在处于D2D模式1传输期间检测网络条件。
报告装置220向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。
挂起装置230可以配置为：如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输还未发送的数据，并且挂起模式1直到小区重选成功。
恢复装置240可以配置为：如果重选到的小区与终端在发生无线链路故障前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
D2D终端200可以通过各个部件的协作来实现上述方法2000，或其具体实现方式2000A或2000B。检测装置210和报告装置220可以配置为实现上述步骤S2100，或S2100a，或S2100b。
挂起装置230和恢复装置240分别完成步骤方法2000中的步骤S2200和S2300的操作。
因此，在此不再对D2D终端200的各个部分进行详细描述。
图9示出了根据本发明的第三实施例的方法3000的流程图。
如前所述，在网络覆盖范围内D2D终端通常会采用网络调度与控制下的D2D通信模式，即模式1。方法3000开始于D2D终端处于模式1传输中。
在步骤S3100中，D2D终端检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。步骤S2100与方法1000中的步骤S1100类似，在此不再赘述。
在步骤S3200中，如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令，则中止模式1传输，保留被中断的传输还未发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。
可选地，方法3000还可以包括步骤S3300。在步骤S3300中，如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续被中断的模式2传输还未发送的数据。
可选地，方法3000还可以包括步骤S3400。在步骤S3400中，如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。
步骤S3200和可选的步骤S3300和S3400将实现物理层过程2。
与方法1000和2000类似，步骤S3200中的数据接收发生中断的触发条件(也即物理层过程2的触发条件)可以是：当前网络条件指示发生了RLF。例如，物理层过程2的触发时间点可以是在小区重选过程计时器T301或T311启动后。或者，中断传输的更激进的触发条件还可以是：当前网络条件指示即将已经发生无线链路故障。例如，物理层过程2的触发时间点可以是在小区切换过程N310计数器计满、T310计时器启动后(如图12-2-a、图12-2-b、图12-2-c、图12-2-d所示)。
步骤S3200以及可选的步骤S3300和S3400例如可以通过物理层过程2-5，其将在下文参考图10进行详细描述。然后，方法3000结束。
图10示出了根据本发明的第三实施例的方法3000的一个具体实现 3000A的流程图。
同样，方法3000A开始于D2D终端处于模式1传输中。步骤S3100a与步骤S3100相同。在此不再赘述。
方法3000A的后续部分描述了物理层过程2-5的详细步骤。
在步骤S3202a中，D2D终端判断检测到的网络条件是否满足数据接收发生中断的触发条件，例如是否发生了RLF。如果满足触发条件，则前进到步骤S3204a，否则返回步骤S3100a。
如果在步骤S3201a中从网络接收到切换到模式2的命令，则也前进到步骤S3204a中。
在步骤S3204a中，D2D终端释放被中断的调度已经完成的传输所占用的物理资源，而对本来即将传输而实际未传输完成的数据如果也分配了物理资源，也需将其释放。
在步骤S3206a中，D2D终端保留被中断的当前调度未传输的数据，丢弃当前调度中已经传输完成的数据。
在步骤S3208a中，假如网络允许该终端在模式2模式中传输，则在设定时间内尝试切换回本小区，否则继续等待，直到进入小区重选设定时间段，在该时间段内尝试小区重选。
在步骤S3210a中，判断在设定时间内D2D终端是否成功切换到模式2。如果成功，则前进到步骤S3212a，否则前进到步骤S3232a，继续等待，直到进入小区重选设定时间段，在该时间段内尝试小区重选。
在步骤S3212a中，D2D终端将转而在模式2中继续发送被中断的当前调度未传完数据。并在此过程中或之后某段时间内尝试切换回本小区。
在步骤S3214a中，在模式2传输的同时，判断在设定时间段内D2D终端是否成功切换回本小区。尝试切换回本小区的设定时间段从确认RLF发生并尝试从模式1传输切换到模式2开始，终止时间可以有若干种配置。尝试切换回本小区的时间段具体配置后面会详细说明，可参考图12-1-a到图12-1-d。如果在设定的时间段内成功切换回本小区，则前进到步骤S3218a，否则前往步骤S3240a。
在步骤S3218中，停止模式2传输，D2D终端保留迄今为止该次调度未传输的数据，丢弃该调度中已经传输完成的数据，并且清空模式2相关所有配置。然后，前进到步骤S3250。
在步骤S3232a中，在小区重选设定的时间段内尝试切换回本小区。
在步骤S3234a中，判断在设定时间内D2D终端是否成功切换回本小区。如果在设定的时间段内成功切换回本小区，则前进到步骤S3250a，否则前往步骤S3240a。
在步骤S3250a中，D2D终端重新切换回Mode1，并在模式1中继续发送被中断的本次调度的未传输完成的数据(本次调度被中断之前在模式1中已传输完成的数据不再重新发送)。
在步骤S3240中，D2D终端丢弃当前保留的所有数据，而不再对当前调度的数据进行传输。
然后，方法3000A结束。
图11示出了根据本发明的第三实施例的D2D终端300的示意框图。如图所示，终端300可以包括检测装置310，报告装置320，接收装置330，以及模式切换装置340。可选地，终端300还可以包括恢复装置350等等。
检测装置310可以在处于D2D模式1传输期间检测网络条件。
报告装置320向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源。
接收装置330可以从网络接收命令，例如切换到模式2传输的命令。
模式切换装置340可以配置为：如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令，则中止模式1传输，保留被中断的传输还未发送的数据，以及在设定时间A内尝试切换到模式2，并执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。模式切换装置340还配置为：在成功切换到模式2的情况下，在模式2下发送所保留的还未发送的数据。
可选地，恢复装置350可以进一步配置为：在初始的模式1传输中断后(比如RLF发生)，在包括尝试切换到模式2和成功切换到模式2并在模式2传输期间的设定时间B内(对于该段时间的设置将在后面详细进行说明)进行小区重选，以尝试重选为原接入小区并回到模式1。如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断 的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续被中断的模式2传输还未发送的数据。
可选地，恢复装置350可以配置为：如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。
对于初始的模式1传输中断后尝试切换回模式1的设定时间(即设定时间B)，其与尝试切换回模式2的设定时间(即设定时间A)之间的时序关系可以存在多种情况。下面以模式切换或恢复尝试开始于RLF发生时刻为例，参考图12-1-a到图12-1-d，详细说明设定时间A和B的时序关系。设定时间B可以设置为开始于传输中断发生时刻，并且持续时间小于设定时间A，即结束于中断发生后尝试切换到模式2期间的某个时间点(如图12-1-a所示)；也可以设置为开始于传输中断发生时刻，并且持续时间大于设定时间A但是小于设定的模式2切换最大尝试时间加模式2最大传输时间的和，即结束于成功切换到模式2之后的模式2传输期间的某个时间点(如图12-1-b所示)；也可以设置为开始于传输中断发生时刻，并且持续时间等于设定的模式2切换最大尝试时间加模式2最大传输时间(如图12-1-c所示)；也可以设置为开始于传输中断发生时刻，并且持续时间大于设定的模式2切换最大尝试时间加模式2最大传输时间(如图12-1-d所示)。
当然，在更激进的触发条件下，即模式切换或恢复尝试从T310计数器开始计时时刻开始时，类似的设置可以如图12-2-a、图12-2-b、图12-2-c、图12-2-d所示。
D2D终端300可以通过各个部件的协作来实现上述方法3000，或其具体实现方式3000A。检测装置310，报告装置320，模式切换装置340和恢复装置3500分别完成步骤方法3000A中的对应步骤的操作。
因此，在此不再对D2D终端300的各个部分进行详细描述。
上文已经结合优选实施例对本发明进行了描述。本领域技术人员可以理解，上面示出的方法和设备仅是示例性的。本发明的方法并不局限于上面示出的步骤和顺序。本发明的移动终端和服务器可以包括比示出的部件更多或更少的部件。本领域技术人员根据所示实施例的教导可以 进行许多变化和修改。
本发明的设备及其部件可以由诸如超大规模集成电路或门阵列、诸如逻辑芯片、晶体管等的半导体、或者诸如现场可编程门阵列、可编程逻辑设备等的可编程硬件设备的硬件电路实现，也可以用由各种类型的处理器执行的软件实现，也可以由上述硬件电路和软件的结合实现。
本领域技术人员应该理解，尽管通过具体实施例描述了本发明，但是本发明的范围不限于这些具体实施例。本发明的范围由所附权利要求及其任何等同含义限定。

Claims (26)

  1. 一种在支持设备到设备“D2D”通信的终端中执行的方法，包括：
    在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；以及
    如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输要发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的数据。
  2. 根据权利要求1所述的方法，其中基站释放调度给所述终端的物理资源包括：如果终端所报告的网络条件满足数据接收发生中断的触发条件，则释放调度给所述终端的被中断的传输的全部资源。
  3. 根据权利要求1所述的方法，其中所述触发条件包括：所述网络条件指示无线链路质量低于预设标准，或者所述网络条件指示已经发生无线链路故障。
  4. 根据权利要求1-3中任一项所述的方法，其中所保留的数据包括被中断的传输要发送的全部数据。
  5. 根据权利要求1-3中任一项所述的方法，其中所保留的数据包括被中断的传输还未发送的数据，而不包括被中断的传输已发送的数据。
  6. 根据权利要求1所述的方法，其中向基站报告检测到的网络条件包括：向基站报告所述终端与基站之间的无线链路连接状况；或者，向基站报告终端处的信道测量值。
  7. 根据权利要求1或6所述的方法，其中所述向基站报告检测到的网络条件仅在当前信道测量值低于阈值时才执行。
  8. 一种在支持设备到设备“D2D”通信的终端中执行的方法，包括：
    在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；
    如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输还未发送的数据，并且挂起模式1直到小区重选成功；以及
    如果重选到的小区与终端在发生无线链路故障前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
  9. 根据权利要求8所述的方法，其中，在挂起模式1时保留为被中断的传输还未发送的数据分配的物理资源。
  10. 根据权利要求8所述的方法，其中，在挂起模式1时不保留为被中断的传输分配的任何物理资源，并且所述方法还包括：在恢复模式1时重新申请资源，以使用重新申请的资源继续发送所保留的被中断的传输还未发送的数据。
  11. 一种在支持设备到设备“D2D”通信的终端中执行的方法，包括：
    在处于D2D模式1传输期间，检测网络条件，并且向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；
    如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令，则中止模式1传输，保留被中断的传输还未发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。
  12. 根据权利要求11所述的方法，还包括：
    如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续被中断的模式2传输还未发送的数据。
  13. 根据权利要求11所述的方法，还包括：
    如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。
  14. 一种支持设备到设备“D2D”通信的终端，包括：
    检测装置，配置为：在处于D2D模式1传输期间，检测网络条件；
    报告装置，配置为：向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；
    模式切换装置，配置为：在检测到的网络条件满足数据接收发生中断的触发条件的情况下，保留被中断的传输要发送的数据，以及执行从模式1到模式2的切换；以及
    数据传输装置，配置为：在模式切换成功后，在模式2下发送所保留的数据。
  15. 根据权利要求14所述的终端，其中基站释放调度给所述终端的物理资源包括：如果终端所报告的网络条件满足数据接收发生中断的触发条件，则释放调度给所述终端的被中断的传输的全部资源。
  16. 根据权利要求14所述的终端，其中所述触发条件包括：所述网络条件指示无线链路质量低于预设标准，或者所述网络条件指示已经发生无线链路故障。
  17. 根据权利要求14-16中任一项所述的终端，其中所保留的数据包括被中断的传输要发送的全部数据。
  18. 根据权利要求14-16中任一项所述的终端，其中所保留的数据包括被中断的传输还未发送的数据，而不包括被中断的传输已发送的数据。
  19. 根据权利要求14所述的终端，其中向基站报告检测到的网络条件包括：向基站报告所述终端与基站之间的无线链路连接状况；或者，向基站报告终端处的信道测量值。
  20. 根据权利要求14或19所述的终端，其中所述报告装置进一步配置为：仅在当前信道测量值低于阈值时，向基站报告检测到的网络条件。
  21. 一种支持设备到设备“D2D”通信的终端，包括：
    检测装置，配置为：在处于D2D模式1传输期间，检测网络条件；
    报告装置，配置为：向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；
    挂起装置，配置为：如果检测到的网络条件满足数据接收发生中断的触发条件，则保留被中断的传输还未发送的数据，并且挂起模式1直到小区重选成功；以及
    恢复装置，配置为：如果重选到的小区与终端在发生无线链路故障前接入的原小区相同，则恢复挂起的模式1以继续发送所保留的被中断的传输还未发送的数据。
  22. 根据权利要求21所述的终端，其中，挂起装置进一步配置为：在挂起模式1时保留为被中断的传输还未发送的数据分配的物理资源。
  23. 根据权利要求21所述的终端，其中，挂起装置进一步配置为：在挂起模式1时不保留为被中断的传输分配的任何物理资源；以及
    所述终端还包括资源申请装置，配置为：在恢复模式1时重新申请资源，以使用重新申请的资源继续发送所保留的被中断的传输还未发送的数据。
  24. 一种支持设备到设备“D2D”通信的终端，包括：
    检测装置，配置为：在处于D2D模式1传输期间，检测网络条件；
    报告装置，配置为：向基站报告检测到的网络条件以协助基站在传输中断时及时释放调度给所述终端的物理资源；
    接收装置，配置为：从网络接收命令；以及
    模式切换装置，配置为：如果检测到的网络条件满足数据接收发生中断的触发条件或者从网络接收到切换到模式2的命令，则中止模式1传输，保留被中断的传输还未发送的数据，以及执行从模式1到模式2的切换，以在模式2下发送所保留的还未发送的数据。
  25. 根据权利要求24所述的终端，还包括恢复装置：
    所述恢复装置配置为：如果在模式2传输期间发生了小区重选，并且重选到的小区与终端在发生无线链路故障前接入的原小区相同，则中止模式2传输，保留被中断的模式2传输仍未发送的数据，以及执行从模式2到模式1的切换，以在模式1下继续被中断的模式2传输还未发送的数据。
  26. 根据权利要求24所述的终端，其中：
    所述恢复装置进一步配置为：如果在预定时间内从模式1到模式2的切换没有成功，并且终端重选到在发生无线链路故障前接入的原小区，则回到模式1下发送所保留的还未发送的数据。
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