WO2011017846A1 - 一种同步方法、移动中继节点、演进基站及用户设备 - Google Patents

一种同步方法、移动中继节点、演进基站及用户设备 Download PDF

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Publication number
WO2011017846A1
WO2011017846A1 PCT/CN2009/073262 CN2009073262W WO2011017846A1 WO 2011017846 A1 WO2011017846 A1 WO 2011017846A1 CN 2009073262 W CN2009073262 W CN 2009073262W WO 2011017846 A1 WO2011017846 A1 WO 2011017846A1
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WO
WIPO (PCT)
Prior art keywords
synchronization
base station
user equipment
timing
relay node
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PCT/CN2009/073262
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English (en)
French (fr)
Inventor
李亚娟
常俊仁
张亮亮
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.)
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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 PCT/CN2009/073262 priority Critical patent/WO2011017846A1/zh
Priority to CN200980146636.4A priority patent/CN102227940B/zh
Publication of WO2011017846A1 publication Critical patent/WO2011017846A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of communications, and in particular, to a synchronization method, a mobile relay node, an evolved base station, and a user equipment.
  • FIG. 1 is a schematic diagram of a radio access network, which includes a donor base station (DeNB, Donor eNodeB), a relay node (RN, Relay Node), and three user equipments (UEs) subordinate to the relay node. , User Equipment ).
  • the three user equipments are labeled as UE1, UE2, and UE3, and the interface between the RN and the RN is the Uu interface; the interface between the RN and the DeNB is the Un port.
  • the relay node is usually fixed.
  • the relay node becomes a mobile relay node (MRN, Mobile RN).
  • MRN mobile relay node
  • the MRN may need to switch from one DeNB to another as the UE, that is, the MRN is switched.
  • the DeNB that provides the MRN service before the handover is called the source DeNB
  • the DeNB that needs to be handed over is called the target DeNB.
  • the synchronization needs to be performed to the target DeNB, that is, the Un-port synchronization is implemented. Because there may be a timing offset between the source DeNB and the target DeNB, the frame timing of the UE is still maintained at the timing state of the source DeNB, which may cause The UE and the MRN are out of synchronization, that is, the Uu port and the Un port are not synchronized. That is to say, after the MRN is switched, the timing deviation may occur between the Uu port and the Un port. How to overcome this out-of-synchronization becomes a problem.
  • the embodiment of the present invention provides a synchronization method, a mobile relay node, an evolved base station, and a user equipment, so as to overcome the problem that the Uu port and the Un port are not synchronized after the MRN is switched.
  • the embodiment of the invention provides a synchronization indication method, including: – switching from the source base station to the target base station and performing synchronization to the target base station;
  • a synchronization indication message is sent to the user equipment to instruct the user equipment to perform synchronization to the local end.
  • the embodiment of the invention further provides a synchronization method, including:
  • Synchronization is performed to the mobile relay node according to the indication of the synchronization indication message.
  • the embodiment of the invention further provides a timing adjustment method, including:
  • the timing of the current frame is adjusted according to the timing offset such that the start time of the current frame is aligned with the start time of any subframe in the synchronization target frame.
  • the embodiment of the invention further provides a mobile relay node, including:
  • a first synchronization module configured to perform synchronization with the target base station after receiving the handover command
  • a command sending module configured to send a synchronization indication message to the user equipment after the synchronization with the target base station is completed, to indicate that the user equipment is The mobile relay node performs synchronization.
  • the embodiment of the invention further provides a user equipment, including:
  • a command receiving module configured to receive a synchronization indication message sent by the mobile relay node
  • a second synchronization module configured to perform synchronization to the mobile relay node according to the indication of the synchronization indication message.
  • the embodiment of the invention further provides a user equipment, including:
  • an indication receiving module configured to receive a synchronization indication message, where the synchronization indication message carries a timing offset between the current frame and the synchronization target frame;
  • a timing adjustment module configured to adjust a timing of the current frame according to the timing offset, so that a start time of the current frame is aligned with a start time of any subframe in the synchronization target frame.
  • the embodiment of the present invention can ensure the Uu port and the Un after the MRN is switched. - - Synchronization of the ports to achieve synchronous communication between the MRN, the UE and the base station.
  • 1 is a schematic diagram of a radio access network
  • FIG. 2 is a schematic flow chart of a handover method in a mobile relay system according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of a synchronization indication method according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of a synchronization method according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic diagram of frame synchronization between a UE and a serving node
  • FIG. 6 is a schematic diagram of a timing adjustment method according to Embodiment 4 of the present invention.
  • FIG. 7 is a schematic diagram showing a timing deviation between a current frame and a synchronization target frame
  • FIG. 8 is a schematic diagram of a preferred subframe offset synchronization between a current frame and a synchronization target frame according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of different timing advancements of different UEs according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an uplink timing adjustment method according to Embodiment 5 of the present invention;
  • FIG. 11 is a schematic diagram of a MAC CE provided by an embodiment of the present invention; A schematic diagram of the timing adjustment indication command carried;
  • FIG. 12 is a schematic diagram of a timing adjustment indication command carried in a MAC RACH RAR according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of a special subframe pattern adjustment method according to Embodiment 6 of the present invention
  • FIG. 14 is a schematic diagram of a handover synchronization method according to Embodiment 7 of the present invention.
  • FIG. 15 is a schematic diagram of a handover synchronization method according to Embodiment 8 of the present invention.
  • FIG. 16 is a schematic flowchart of a preferred handover synchronization method according to Embodiment 9 of the present invention
  • FIG. 17 is a schematic diagram of a mobile relay node according to Embodiment 10 of the present invention.
  • FIG. 18 is a schematic diagram of a user equipment according to Embodiment 11 of the present invention.
  • FIG. 19 is a schematic diagram of a mobile relay node according to Embodiment 12 of the present invention
  • FIG. Figure 20 is a schematic diagram of a mobile relay node according to Embodiment 13 of the present invention.
  • FIG. 21 is a schematic diagram of a user equipment according to Embodiment 14 of the present invention.
  • FIG. 22 is a schematic diagram of a user equipment according to Embodiment 15 of the present invention.
  • FIG. 2 is a schematic flowchart of a handover method in a mobile relay system according to Embodiment 1 of the present invention, where the method includes:
  • S21 The mobile relay node, the source base station, and the target base station perform handover negotiation.
  • the handover negotiation may be performed between the source base station and the target base station, or may be performed between the relay node and the target base station.
  • the source base station or the target base station After the handover negotiation, the source base station or the target base station notifies the relay node to perform handover.
  • the following takes the source base station to send a handover command as an example.
  • the source base station sends a handover command to the mobile relay node.
  • the source base station may carry a timing offset between the source base station and the target base station in the handover command.
  • S23 The mobile relay node performs handover after receiving the handover command.
  • the mobile relay node may disconnect the connection with the source base station according to the hard handover procedure, and perform synchronization to the target base station.
  • the process in which the mobile relay node performs synchronization to the target base station is also called Un port synchronization.
  • the MRN may perform downlink synchronization with the target base station according to the timing offset of the source base station and the target base station carried in the handover command, and then perform uplink timing adjustment, and finally complete the synchronization process with the target base station.
  • the method may further include: S24: The mobile relay node instructs the UE to perform synchronization to itself. After the mobile relay node switches to the target base station and synchronizes with the target base station, it is necessary to determine whether the UE needs to perform synchronization with the mobile relay node further. If uplink and downlink synchronization is required, the MRN may The UE is notified to perform synchronization to it. After receiving the synchronization indication, the UE may perform downlink synchronization with the MRN first, and then perform uplink timing adjustment to complete synchronization between the UE, the MRN, and the target base station. After synchronization, there is no timing deviation between the Uu interface and the Un of the MRN. , or make the timing of the Uu port and the Un port have an integer number of subframe offsets.
  • the handover command sent by the source base station to the mobile relay node may not carry the timing offset of the source base station and the target base station, and the MRN determines the timing deviation of the source base station and the target base station, and the MRN may also The timing deviation of the source base station and the target base station is obtained from the target base station or other third-party entity, which is not limited in this embodiment.
  • the process of synchronizing between two nodes may include two parts: a downlink synchronization and an uplink timing adjustment, where the downlink synchronization refers to synchronizing the downlink frames and the subframes of the two nodes;
  • the uplink timing adjustment is performed on the basis of downlink synchronization, that is, the node performs downlink synchronization with another node first, and then performs uplink timing adjustment to adjust that the uplink data frame can meet the uplink data transmission requirement with another node.
  • the uplink timing adjustment is a timing advancement process to overcome the impact of the uplink data transmission delay of the UE, so that the frame timing of the data sent by the UE to the serving node meets the requirements of the uplink and downlink frame alignment of the serving node, and subsequent embodiments will have this A detailed description.
  • the MRN subordinate UE may remain in the original timing state, causing the UE and the MRN and the target base station to fail. Synchronize.
  • FIG. 3 is a schematic diagram of a synchronization indication method according to Embodiment 2 of the present invention.
  • the UE can synchronize with the target base station and the MRN without switching to the target base station.
  • the method includes:
  • S31 Switching from the source base station to the target base station and performing synchronization to the target base station;
  • the paging message or the self-switching command is sent to the UE.
  • the paging message or the self-switching command includes triggering the UE to execute the synchronization indication message. Instructing the UE to perform synchronization to the MRN; wherein the self-handover command is a handover command that notifies the UE to switch to the MRN.
  • the UE does not need to implement the handover, only needs to receive the MRN synchronization indication message, and performs synchronization with the MRN, so as to implement synchronization between the UE, the MRN, and the target base station, and ensure the MRN handover.
  • the Un port is synchronized with the Uu port.
  • some UEs need to perform handover, but the handover target is still the MRN itself.
  • the paging message or the self-switching command may also be a PDCCH-initiated RACH (Random Access Channel) command.
  • the MRN may send a paging message to the UE, and add a triggering UE to perform a synchronization indication message in the paging message to trigger the UE to perform system message update and perform synchronization.
  • the MRN may send a self-switching command to the UE, where the self-switching command is a handover command for informing the UE to switch to the MRN, and adding a triggering UE to perform a synchronization indication message in the self-switching command.
  • the self-switching command is not actually used to notify the UE to perform handover, but is only used to notify the UE to perform synchronization. Considering compatibility at the same time, some UEs may be allowed to perform a true handover, but the target of the handover is still the MRN.
  • the MRN can trigger by using a PDCCH to initiate a RACH command.
  • the process of performing synchronization by the UE such as using the RACH command in PDCCH format 1A, triggers the UE to perform synchronization.
  • the UE may be required to perform downlink synchronization and then perform uplink timing adjustment.
  • the UE may also perform uplink synchronization only in consideration of compatibility.
  • synchronization indication message can also be a customized new message, which is not limited in this embodiment.
  • - Figure 4 is a schematic diagram of a synchronization method according to Embodiment 3 of the present invention. The method is based on an application scenario: a mobile relay node switches to a target base station and, after completing synchronization with the target base station, notifies the UE to perform synchronization to itself, the method comprising:
  • S41 Receive a synchronization indication message of the mobile relay node.
  • the MRN may send a paging message to the UE, and add a triggering UE to perform a synchronization indication message in the paging message to trigger the UE to perform system message update and perform synchronization.
  • the UE may determine whether it is necessary to perform synchronization according to the indication by acquiring an indication message carried in the paging message.
  • the UE may determine whether it is necessary to perform synchronization according to the indication by acquiring the indication message carried in the self-switching command.
  • the self-handover command is not used to indicate a true handover, but indicates that the UE switches to the MRN itself, that is, instructs the UE to switch to its own cell.
  • the UE here does not need to actually switch, but only needs to perform an uplink and downlink synchronization.
  • some UEs may be allowed to perform a real handover, but the target of the handover is still the MRN.
  • the UE in this embodiment does not need to follow the MRN in which the handover occurs, and switches to the target base station, and performs synchronization only to the MRN according to the indication, thereby achieving synchronization between the UE, the MRN, and the target base station, and ensuring the Un port and the Uu after the MRN switching. Synchronization of the mouth.
  • the synchronization indication message in this embodiment may also be a reconfiguration message or other newly defined message, and it is within the scope of the present invention as long as the same effect can be achieved.
  • FIG. 5 is a schematic diagram of frame synchronization between a UE and a serving node.
  • one frame A1 of the UE is temporally aligned with one frame A2 of the serving node.
  • frame A1 and frame A2 may each include n _ _ subframe m, each of the corresponding frames in frame A1 and frame A2 are also aligned with each other in time, ensuring synchronization between the UE and the serving node.
  • the frame A1 is its current frame
  • the frame A2 is its synchronization target frame.
  • the UE adjusts the frame timing of its current frame A1 so that the current frame A1 and the synchronization target frame A2 are temporally aligned. , that is, the synchronization between the UE and the service node is completed.
  • FIG. 6 is a schematic diagram of a timing adjustment method according to Embodiment 4 of the present invention, where the method includes:
  • S61 Receive a synchronization indication message, where the synchronization indication message carries a timing offset between the current frame and the synchronization target frame.
  • S62 Adjust a timing of the current frame according to the timing offset, so that a start time of the current frame is aligned with a start time of any subframe in the synchronization target frame.
  • the current frame of the UE and the synchronization target frame are not aligned in time, and only the start time of the current frame is aligned with the start time of any subframe in the synchronization target frame, and the UE and the service node are Synchronization is not implemented, but since the UE and the subframes of the serving node are synchronized, this situation can be referred to as subframe offset synchronization.
  • the UE can perform information transmission with the serving node on the synchronized subframe.
  • the timing adjustment method is not limited to the UE side, and the method may be used to perform timing adjustment between the base stations of the network side or the service nodes such as the RN, so as to achieve synchronization of the subframe offsets, which is not limited in this embodiment.
  • the UE does not need to implement true synchronization, and the complexity of the timing adjustment is reduced only by the subframe offset synchronization.
  • the UE may find a subframe that is closest to the start time of the current frame in the synchronization target frame according to the timing offset between the current frame and the synchronization target frame, and adjust the timing of the current frame to make the current frame.
  • the starting moment is aligned with the starting moment of the found subframe.
  • FIG. 7 is a schematic diagram of timing deviation between a current frame and a synchronization target frame.
  • the B frame and the C frame each include n subframes, and the B frame intra subframe.
  • bl, b2, b3 ⁇ ⁇ bn indicates that the C frame intraframe is represented by cl, c2, c3 cn.
  • FIG. 8 is a schematic diagram of a preferred subframe offset synchronization between a current frame and a synchronization target frame according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a preferred subframe offset synchronization between a current frame and a synchronization target frame according to an embodiment of the present invention.
  • the start time of the current frame B is aligned with the start time of the subframe b3 in the synchronization target frame C, that is, the subframe offset synchronization between the B frame and the C frame is realized. Since the start time of the current frame B in FIG. 7 is closest to the start time of the subframe c3 in the synchronization target frame C, the start time of the current frame B can be adjusted to be aligned with the start time of the subframe c3, and of course The start time of the current frame B can be aligned with the start time of other subframes in the synchronization target frame C.
  • downlink synchronization is usually performed first, and then uplink timing adjustment is performed.
  • uplink timing adjustment between the UE and the serving node is still taken as an example for description.
  • the UE performs the timing adjustment, that is, the process of performing the timing advance. Since the uplink transmission data of the UE arrives at the serving node, there is a certain time delay, and the UE needs to perform uplink timing adjustment, so that the uplink data of the UE arrives at the time desired by the serving node. Moreover, when the distances of different UEs from the service node are different, the delay generated by the UE when performing uplink transmission is also different. FIG.
  • FIG. 9 is a schematic diagram of different timing advancements of different UEs according to an embodiment of the present invention.
  • the delay time of the uplink data of the UE1 to the serving node is t1, and the t1 can be used as the timing advance of the UE1; the delay time of the uplink data of the UE2 to the serving node is t2, and the t2 can be used as the timing of the UE2.
  • Advance quantity When UE1 is closer to the serving node than UE2, UE1 has a smaller uplink transmission delay than UE2, so UE1's timing advance is also smaller than UE2. Therefore, in Fig. 9, the timing advance of frame E of UE1 with respect to frame D of the serving node is t1, and the timing advance of frame F of UE2 with respect to frame D of the serving node is t2, where tl ⁇ t2.
  • the UE If the UE is to perform timing adjustment, it needs to receive a timing advance command sent by the serving node to perform timing adjustment according to the timing advance in the command.
  • the UE since the range of the uplink timing adjustment is limited, if the MRN is switched, the timing deviation between the Uu port and the Un port occurs, and the timing deviation exceeds the range of the uplink timing adjustment, the UE needs to go through multiple uplink timings. Adjustments increase the difficulty of adjustment.
  • the service node can utilize MAC (Medium Access — —
  • RACH RAR Random Access Response
  • MAC CE Control Elements
  • TA Command Timing Advance Command
  • the maximum adjustment range that can be indicated by MAC RACH RAR is 0.017 ms
  • the maximum adjustment range that can be indicated by MAC CE is 0.067 ms. If the system needs 0.5 ms adjustment range, multiple MAC RACH RAR or MAC are needed.
  • the CE instructs the UE to make multiple adjustments, making the adjustment process complicated.
  • Embodiment 5 of the present invention provides an uplink timing adjustment method.
  • the serving node sends a timing adjustment indication command to the UE, where the timing adjustment indication command uses the timing advance command field in the command and the reserved field before the field to indicate the timing advance amount that the UE needs to adjust.
  • the timing adjustment indication command uses the timing advance command field in the command and the reserved field before the field to indicate the timing advance amount that the UE needs to adjust.
  • the UE receives the timing adjustment indication command, and performs timing advance adjustment according to the timing advance command field and the indication of the reserved field.
  • FIG. 10 is a schematic diagram of an uplink timing adjustment method according to Embodiment 5 of the present invention. The method includes:
  • S101 Send a MAC RACH RAR or a MAC CE to the UE, where the MAC RACH RAR or MAC CE includes a timing advance command field and a reserved field to indicate that the UE performs uplink timing adjustment by using the timing advance command field and the reserved field.
  • FIG. 11 is a schematic diagram of a timing adjustment indication command carried in a MAC RACH RAR according to an embodiment of the present invention.
  • this implementation An example of a timing adjustment time in conjunction with a 1-bit reserved field.
  • the maximum adjustment time NTA-MAX is 1.73ms, which means that the maximum adjustment time can be more than doubled by adding a 1-bit reserved field R.
  • the timing advance value TA may take any value of 0, 1, or 2 1282; when R is 1, the calculation formula of the timing adjustment amount may be variable.
  • N TA TAxTsxn, where n can take an integer greater than 16, and TA can also take a value of 0, 1,
  • the maximum adjustment time is larger than the original representation.
  • the reserved field has other utilization rules. By adding 1 bit of indication information, the maximum timing adjustment time that can be indicated is increased, and the range of timing adjustment can be increased.
  • FIG. 12 is a schematic diagram of a timing adjustment indication command carried in a MAC CE according to an embodiment of the present invention.
  • the 2-bit reserved field R is combined with the timing advance command field to form an overall field, which can represent 256 different situations, that is, the timing adjustment indication command value can be taken as 0, 1, 2 Any value in 255. If the above formula for calculating the timing adjustment amount is still used, the maximum adjustment time becomes 0.068 ms due to the addition of the 2-bit reserved field R, which is 4 times the original. – In another method using the reserved field R, when the 2-bit reserved field R is 00, the timing advance value
  • the value of the 2-bit reserved field R is different, different maximum timing adjustment times can be indicated, so that the maximum adjustment time and the timing adjustment range are expanded.
  • the 2-bit reserved field has other usage rules.
  • the range of timing adjustment is increased.
  • S102 The UE receives the MAC RACH RAR or MAC CE sent by the serving node, according to the MAC.
  • the uplink timing adjustment is performed by the indication of the timing advance command field and the reserved field in the RACH RAR or MAC CE.
  • the UE calculates the timing of the timing adjustment according to the rule determined in S101 according to the indication of the timing advance command field and the reserved field, and can obtain a larger timing adjustment range than the prior art.
  • Embodiment 6 of the present invention provides a method for adjusting a special subframe pattern (Pattern).
  • the special subframe includes but is not limited to an MBSFN (Multicast Broadcast Single Frequency Network) subframe or a Blank subframe.
  • FIG. 13 is a schematic diagram of a method for adjusting a special subframe pattern according to Embodiment 6 of the present invention.
  • the MRN may send a paging message to the UE to trigger the UE to perform system message update, where the paging message includes special subframe Pattern adjustment information, where the special subframe Pattern adjustment information indicates that the What adjustments are made to special subframes.
  • the MRN may send a self-switching command to the UE, where the self-switching command - a command to notify the UE to switch to the MRN, and include a special subframe of the target base station in the self-switching command to trigger the UE to update the special subframe Pattem.
  • the MRN can also use special signaling to notify the UE to perform special subframe pattern adjustment.
  • the change information of the special subframe pattern may be carried in the reconfiguration message or the custom message, which is not limited in this embodiment.
  • the UE After receiving the special subframe Pattern change message, the UE adjusts its special subframe Pattern to a new special subframe Pattern, which is consistent with the target base station or the MRN.
  • the UE can obtain the special subframe Pattern of the target base station from the special subframe Pattern change message, thereby adjusting its own special subframe Pattern to be consistent with the target base station or MRN.
  • the source DeNB may be different from the special subframe of the target DeNB.
  • the terminal adjusts its special subframe Pattern according to the indication of the MRN after the handover, so as to ensure that the special subframes and the MRN are switched.
  • the target base stations after the collision do not conflict.
  • FIG. 14 is a schematic diagram of a handover synchronization method according to Embodiment 7 of the present invention, where the method includes:
  • S142 Perform synchronization to the target base station, and stop data transmission with the UE during the execution of the synchronization period.
  • the interface between the MRN and the target base station is the Un port.
  • the MRN can keep the Uu port for transmitting data with the UE to be silent, and reduce the interference caused by the synchronization of the data transmission of the Uu port to the Un port. Stopping the data transmission with the UE may include: stopping receiving data or information of the UE; or stopping transmitting data and information to the UE. It can be understood that, in this step, the MRN may not transmit the data transmission with the UE, but transmit the data and information of the Uu interface according to the timing sequence of the Un interface, thereby reducing the measurement and synchronization of the Un port data transmission to the UE. influences.
  • FIG. 15 is a schematic diagram of a handover synchronization method according to Embodiment 8 of the present invention, where the method package - - Includes:
  • S152 The UE is notified to perform synchronization to the local end, and stops data transmission with the target base station during the UE performing synchronization.
  • the UE after the MRN is synchronized with the target base station, the UE performs synchronization with the serving node (MRN or base station), and during the synchronization period of the UE, in order to prevent the Un interface from affecting the Uu interface synchronization, the MRN may stop with the target base station. Data transmission, that is, stopping receiving data or information of the target base station or stopping transmission of data and information to the target base station.
  • the UE may send an RRC (Radio Resource Control) reconfig complete message to the MRN, indicating that the MRN synchronization has been completed, and the MRN may resume Un.
  • RRC Radio Resource Control
  • the UE may also send an RRC reconfig complete message to the MRN during the synchronization process, to notify the MRN that the handover may be completed after a predetermined time or a few frames, so that the MRN starts the transmission of the Un port after a predetermined time or several frames.
  • the MRN may also send an RRC reconfig complete message to notify the target base station to resume the data transmission of the Un port after the Uu port is synchronized. It can be understood that the MRN can also send the RRC reconfig complete message according to the existing procedure and complete the Uu port synchronization, and then use other messages to notify the target base station to resume the data transmission of the Un port.
  • Embodiment 7 and Embodiment 8 can be used in combination, and the MRN can stop data transmission with the UE when performing synchronization to the target base station; after the MRN completes synchronization with the target base station, the UE can be notified to perform synchronization to itself or the target base station. And in the synchronization performed by the UE, the data transmission with the target base station is stopped, so that the synchronization between the Un port and the Uu port does not form interference after the MRN completes the handover between different base stations.
  • FIG. 16 is a schematic flowchart of a preferred handover synchronization method according to Embodiment 9 of the present invention. — Include:
  • SI 61 The MRN, the source base station and the target base station perform handover negotiation.
  • the specific switching decision can be made by any party between the three parties.
  • S162 The source base station sends a handover command to the MRN.
  • the MRN After receiving the handover command, the MRN performs handover and performs synchronization to the target base station. Specifically, the MRN can perform downlink synchronization first, and then perform uplink timing adjustment. During the synchronization process, the MRN may stop its data transmission with the UE.
  • the MRN After completing the synchronization with the target base station, the MRN notifies the UE to perform synchronization to it.
  • the MRN may stop data transmission with the target base station, that is, Un port transmission.
  • the UE may be configured to perform the synchronization to the UE.
  • the UE may send a self-switching message or a paging message to the UE to perform synchronization, and may also carry a special subframe Pattern change message, a timing offset between the source base station and the target base station, and the like.
  • the MRN may also send a MAC RACH RAR or MAC CE to the UE at this time, and use the MAC RACH RAR or MAC CE inner timing advance command field and the reserved field to instruct the UE to perform uplink timing adjustment.
  • the UE performs synchronization to the MRN. Specifically, the UE may perform the subframe offset synchronization to the MRN. For the specific subframe offset synchronization process, refer to the previous embodiment, and details are not described herein again. The UE may also complete the special subframe Pattern change according to the MRN indication. The UE may perform downlink synchronization first, and then perform uplink timing adjustment. Performing the uplink timing adjustment may include: receiving a MAC RACH RAR or a MAC CE sent by the MRN, performing uplink timing adjustment according to the indication of the timing advance command field and the reserved field in the MAC RACH RAR or the MAC CE, and the uplink timing adjustment may be effectively expanded. The range of uplink timing adjustment. The specific implementation process of the adjustment may participate in the previous embodiment, and details are not described herein again.
  • the UE After performing synchronization to the MRN, the UE notifies the MRN that the synchronization is completed. Specifically, the UE may send an RRC reconfig complete message to the MRN, so that the UE restarts the closed Un port transmission according to the message.
  • the UE, the MRN, and the target base station are implemented. — ⁇ Synchronization, avoiding the deviation between the Uu port and the Un port of the MRN.
  • this embodiment can avoid the interference of the Uu interface and the Un interface during the handover synchronization process, and can change the special subframe of the UE, and can also synchronize the synchronization process by using the subframe offset synchronization between the UE and the MRN, and can pass the MAC.
  • the RACH RAR or MAC CE expands the uplink timing adjustment range and the like.
  • FIG. 17 is a schematic diagram of a mobile relay node according to Embodiment 10 of the present invention, where the mobile relay node includes:
  • the first synchronization module 171 is configured to perform synchronization with the target base station after receiving the handover command.
  • the command sending module 172 is configured to send a synchronization indication message to the user equipment to indicate the user equipment after completing synchronization with the target base station. Perform synchronization to the local end.
  • the mobile relay node may further include: a change notification module, configured to send a special subframe Pattern Change message to the user equipment, where the special subframe Pattern change message is used to instruct the user equipment to adjust its special subframe Pattern to Consistent with the target base station.
  • the mobile relay node may further include: an adjustment indication module, configured to send a media access control (MAC) random access channel (RACH) random access response (RAR) or media access control (MAC) control to the user equipment.
  • the unit (CE), the MAC RACH RAR or the MAC CE includes a timing advance command field and a reserved field to instruct the user equipment to perform uplink timing adjustment by using the timing advance command field and the reserved field.
  • the mobile relay node may further include: a user data stopping module, configured to stop data transmission with the user equipment during performing synchronization to the target base station. Further, the mobile relay node may further include: a base station data stopping module, configured to stop data transmission with the target base station during synchronization performed by the user equipment.
  • the mobile relay node in this embodiment may instruct the UE to perform synchronization or perform special subframe pattern adjustment on the UE, such that the frame synchronization configuration of the UE or the special subframe Pattern is consistent with the MRN, and may also utilize the MAC RACH RAR or MAC CE internal timing.
  • the advance command field and the reserved field indicate the timing adjustment of the UE, and another air interface can be turned off during the synchronization of the Uu port or the Un port to avoid interference.
  • Figure 18 is a schematic diagram of a user equipment according to Embodiment 11 of the present invention.
  • the device includes: a command receiving module 181, configured to receive a synchronization indication message sent by a mobile relay node, and a second synchronization module 182, configured to: Synchronization is performed to the mobile relay node according to the indication of the synchronization indication message.
  • the user equipment may further include: a style change module, configured to receive a special subframe Pattern change message, and adjust the special subframe pattern to be consistent with the MRN according to the indication of the special subframe Pattern change message.
  • a style change module configured to receive a special subframe Pattern change message, and adjust the special subframe pattern to be consistent with the MRN according to the indication of the special subframe Pattern change message.
  • the user equipment may further include: an adjustment receiving module, configured to receive a MAC RACH RAR or a MAC CE sent by the mobile relay node, and perform uplink according to the indication of the timing advance command field and the reserved field in the MAC RACH RAR or MAC CE Timing adjustment.
  • an adjustment receiving module configured to receive a MAC RACH RAR or a MAC CE sent by the mobile relay node, and perform uplink according to the indication of the timing advance command field and the reserved field in the MAC RACH RAR or MAC CE Timing adjustment.
  • FIG. 19 is a schematic diagram of a mobile relay node according to Embodiment 12 of the present invention, where the mobile relay node includes:
  • a handover determining module 191, configured to determine to switch to a target base station
  • the base station synchronization module 192 is configured to perform synchronization to the target base station, and stop data transmission with the UE during the execution of the synchronization period.
  • the mobile relay node may further include: a user synchronization module, configured to notify the UE to perform synchronization after completing synchronization with the target base station, and stop data transmission with the target base station during the UE performing synchronization.
  • a user synchronization module configured to notify the UE to perform synchronization after completing synchronization with the target base station, and stop data transmission with the target base station during the UE performing synchronization.
  • the mobile relay node in this embodiment can effectively avoid interference between the Uu port and the Un port during the synchronization process.
  • FIG. 20 is a schematic diagram of a mobile relay node according to Embodiment 13 of the present invention, where the mobile relay node includes:
  • the setting module 201 is configured to set a timing advance command field and a reserved field in the MAC RACH RAR or the MAC CE, to use the timing advance command field and the reserved field to instruct the UE to perform uplink timing adjustment;
  • the message sending module 202 is configured to send the MAC RACH RAR or MAC CE to the UE.
  • Figure 21 is a schematic diagram of a user equipment according to Embodiment 14 of the present invention, the user equipment includes:
  • the message receiving module 211 is configured to receive, by the serving node, a MAC RACH RAR or MAC uplink adjustment module 212, configured to perform uplink timing adjustment according to the indication of the timing advance command field and the reserved field in the MAC RACH RAR or MAC CE.
  • the thirteenth and fourteenth embodiments above can expand the range of uplink timing adjustment of the user equipment.
  • FIG. 22 is a schematic diagram of a user equipment according to Embodiment 15 of the present invention, where the user equipment includes:
  • the indication receiving module 221 is configured to receive a synchronization indication message, where the synchronization indication message carries a timing offset between the current frame and the synchronization target frame.
  • the timing adjustment module 222 is configured to adjust a timing of the current frame according to the timing offset, so that a start time of the current frame is aligned with a start time of any subframe in the synchronization target frame.
  • the timing adjustment module 222 may include: a searching unit, configured to find, according to the timing deviation, a subframe that is closest to a start time of the current frame in the synchronization target frame; and an adjusting unit, configured to adjust the current frame The timing of the current frame is aligned with the start time of the found subframe.
  • the user equipment of this embodiment can reduce the complexity of timing adjustment by using subframe offset synchronization. It is to be understood that the foregoing embodiments of the device may be combined with each other to form a new embodiment, which is not limited by the present invention.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Description

一 一 一种同步方法、 移动中继节点、 演进基站及用户设备 技术领域
本发明涉及通信领域， 特别涉及一种同步方法、 移动中继节点、 演进基站 及用户设备。
背景技术
图 1为一种无线接入网的示意图，该网络中包括一施主基站（DeNB, Donor eNodeB )、 一中继节点 （RN, Relay Node )、 及该中继节点下属的 3个用户设 备（ UE, User Equipment )。所述 3个用户设备被分别标记为 UE1、 UE2和 UE3 , 它们与 RN之间的接口为 Uu口； RN与 DeNB间的接口则为 Un 口。
中继节点通常是固定不动的， 当中继节点具有移动性时， 该中继节点就成 为一个移动中继节点 （ MRN , Mobile RN )。 在包括 MRN的***中， 当 MRN 发生移动时， MRN可能需要像 UE一样， 从一个 DeNB切换到另一个 DeNB , 即产生 MRN的切换。这里将切换前为 MRN提供服务的 DeNB称为源 DeNB, 需要切换到的 DeNB称为目标 DeNB。
当 MRN发生切换后， 需要向目标 DeNB执行同步， 即实现 Un口同步； 由于源 DeNB与目标 DeNB之间可能存在定时偏差，此时 UE的帧定时还维持 在源 DeNB的定时状态， 这会造成 UE与 MRN间出现不同步， 即 Uu口与 Un 口间的不同步。 也就是说， 在 MRN切换后， Uu口与 Un口间可能出现定时偏 差， 如何克服这种不同步就成为一个问题。
发明内容
本发明实施例提供一种同步方法、 移动中继节点、 演进基站及用户设备， 以克服 MRN发生切换后出现的 Uu口与 Un口不同步问题。
本发明实施例提供一种同步指示方法， 包括： — — 从源基站切换到目标基站并向目标基站执行同步；
在与目标基站完成同步后， 向用户设备发送同步指示消息， 以指示所述用 户设备向本端执行同步。
本发明实施例还提供一种同步方法， 包括：
接收移动中继节点的同步指示消息；
根据所述同步指示消息的指示， 向所述移动中继节点执行同步。
本发明实施例还提供一种定时调整方法， 包括：
接收同步指示消息，所述同步指示消息中携带当前帧与同步目标帧间的定 时偏差；
根据所述定时偏差调整当前帧的定时，使当前帧的起始时刻与同步目标帧 中任一子帧的起始时刻相对齐。
本发明实施例还提供一种移动中继节点， 包括：
第一同步模块， 用于在接收到切换命令后， 与目标基站执行同步； 命令发送模块， 用于在与目标基站完成同步后， 向用户设备发送同步指示 消息， 以指示所述用户设备向本移动中继节点执行同步。
本发明实施例还提供一种用户设备， 包括：
命令接收模块， 用于接收移动中继节点发送的同步指示消息；
第二同步模块， 用于才艮据所述同步指示消息的指示， 向所述移动中继节点 执行同步。
本发明实施例还提供一种用户设备， 包括：
指示接收模块， 用于接收同步指示消息， 所述同步指示消息中携带有当前 帧与同步目标帧间的定时偏差；
定时调整模块， 用于根据所述定时偏差调整当前帧的定时，使当前帧的起 始时刻与同步目标帧中任一子帧的起始时刻相对齐。
由上述方案可知，本发明实施例可以在 MRN发生切换后保证 Uu口与 Un - - 口的同步， 从而实现 MRN、 UE和基站三方的同步通信。
附图说明
图 1为一种无线接入网的示意图；
图 2 为本发明实施例一提供的一种移动中继***中切换方法的流程示意 图；
图 3为本发明的实施例二提供一种同步指示方法的示意图；
图 4为本发明实施例三提供的一种同步方法的示意图；
图 5为一种 UE与服务节点间帧同步的示意图；
图 6为本发明实施例四提供的一种定时调整方法的示意图；
图 7为一种当前帧与同步目标帧间存在定时偏差的示意图；
图 8 为本发明实施例提供的一种优选的在当前帧与同步目标帧间实现子 帧偏移同步的示意图；
图 9为本发明实施例提供的不同 UE对应不同定时提前量的示意图； 图 10为本发明实施例五提供的一种上行定时调整方法的示意图； 图 11为本发明实施例提供的 MAC CE内携带的定时调整指示命令的示意 图；
图 12为本发明实施例提供的 MAC RACH RAR内携带的定时调整指示命 令的示意图；
图 13为本发明实施例六提供的一种特殊子帧 Pattern调整方法的示意图； 图 14为本发明实施例七提供的一种切换同步方法的示意图；
图 15为本发明实施例八提供的一种切换同步方法的示意图；
图 16为本发明实施例九提供的优选的切换同步方法的流程示意图； 图 17为本发明实施例十提供的一种移动中继节点的示意图；
图 18为本发明实施例十一提供的一种用户设备的示意图；
图 19为本发明实施例十二提供的一种移动中继节点的示意图； — — 图 20为本发明实施例十三提供的一种移动中继节点的示意图；
图 21为本发明实施例十四提供的一种用户设备的示意图；
图 22为本发明实施例十五提供的一种用户设备的示意图。
具体实施方式
下面将结合附图， 对本发明的实施方案进行详细描述。 需要说明的是， 以 下实施例仅仅是本发明一部分实施例， 而不是全部的实施例。基于本发明实施 例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施 例， 都属于本发明保护的范围。
图 2 为本发明实施例一提供的一种移动中继***中切换方法的流程示意 图， 所述方法包括：
S21 : 移动中继节点、 源基站和目标基站进行切换协商。
具体地，切换协商可以在源基站和目标基站之间进行，也可以在中继节点 和目标基站之间进行，切换协商之后， 由源基站或目标基站通知中继节点进行 切换。 下面就以源基站发送切换命令为例说明。
S22: 源基站发送切换命令给所述移动中继节点。
具体地， 源基站可在所述切换命令中携带源基站和目标基站的定时偏差。 S23: 移动中继节点在收到切换命令后， 执行切换。
具体地， 移动中继节点可以按照硬切换流程， 断开与源基站间的连接， 向 所述目标基站执行同步。 移动中继节点向目标基站执行同步的过程也叫 Un口 同步。 具体地， MRN可首先根据切换命令中携带的源基站和目标基站的定时 偏差， 执行与目标基站的下行同步， 然后进行上行定时调整， 最终完成与目标 基站的同步过程。
所述方法还可进一步包括： S24: 移动中继节点指示 UE向自身执行同步。 当移动中继节点切换到目标基站并与目标基站实现同步后，需要判断是否 需要进一步执行 UE与移动中继节点的同步， 如果需要上下行同步则 MRN可 通知 UE向其执行同步。 UE接到同步指示后， 可首先执行与 MRN的下行同 步， 然后进行上行定时调整， 完成 UE、 MRN和目标基站三者间的同步， 实现 同步后， MRN的 Uu口与 Un间不存在定时偏差， 或者使 Uu 口和 Un口的定 时存在整数个子帧偏移。
可以理解，在 S22中， 源基站发送给所述移动中继节点的切换命令可以不 携带源基站和目标基站的定时偏差， 而由 MRN在判断源基站和目标基站的定 时偏差大小， MRN还可从目标基站或其它第三方实体处获得源基站和目标基 站的定时偏差， 本实施例对此不做限定。
本发明实施例的 MRN在切换后通过与 UE之间执行同步过程， 克服 Uu 口与 Un口间可能出现的不同步问题。 在本发明实施例中， 2个节点（UE或基 站或 RN ) 间同步的过程都可以包括下行同步和上行定时调整 2部分， 所述下 行同步是指使 2个节点的下行帧和子帧实现同步；所述上行定时调整是在下行 同步的基础上进行的， 即节点先与另一节点执行下行同步，之后执行上行定时 调整， 以调整上行数据帧能够满足与另一节点的上行数据传输需求。上行定时 调整就是一个定时提前的过程， 以克服 UE 的上行数据传输延迟的影响， 使 UE发送的数据到达服务节点的帧定时符合服务节点的上下行帧对齐的需求， 后续实施例对此将有详细描述。
在实际应用中， 目标基站与源基站间可能存在定时偏差， MRN切换到目 标基站并与目标基站执行同步后， MRN下属 UE可能依然维持在原来的定时 状态， 造成 UE与 MRN及目标基站间无法同步。
图 3为本发明的实施例二提供一种同步指示方法的示意图，所述方法使得 MRN发生切换时， UE无需切换到目标基站，即可实现 UE与目标基站及 MRN 的同步。 所述方法包括：
S31： 从源基站切换到目标基站并向目标基站执行同步；
S32: 在与目标基站完成同步后， 向用户设备发送同步指示消息， 以指示 - - 所述用户设备向本端执行同步。
具体地， 可在 MRN从源基站切换到目标基站并与目标基站执行同步后， 向 UE发送寻呼消息或自切换命令； 所述寻呼消息或自切换命令中包含触发 UE执行同步指示消息， 以指示所述 UE向 MRN执行同步； 其中， 所述自切 换命令为通知 UE切换到所述 MRN的切换命令。 在该方法实施例中， MRN 切换到目标基站后， UE无需实现切换， 只需接收 MRN同步指示消息， 并向 MRN执行同步， 从而实现 UE、 MRN和目标基站三者间的同步， 保证 MRN 切换后 Un口与 Uu口的同步。 考虑到兼容性， 部分 UE需要执行切换， 但是 切换目标仍然是 MRN本身。 可以理解， 所述寻呼消息或自切换命令也可以是 一个 PDCCH启动 RACH ( Random Access Channel, 随机接入信道 )命令。
在一种实现方式， MRN可向 UE发送寻呼（paging )消息， 并在所述寻呼 消息中增加触发 UE执行同步指示消息， 以触发 UE进行***消息更新及执行 同步。
在另一种实现方式中， MRN可向 UE发送一自切换命令， 所述自切换命 令为通知 UE切换到所述 MRN的切换命令，并在该自切换命令中增加触发 UE 执行同步指示消息， 以触发 UE进行***消息更新及执行同步。 在本实现方式 中， 所述自切换命令并非真正用于通知 UE进行切换， 而仅用于通知 UE执行 同步。 同时考虑到兼容性， 可以允许部分 UE执行真正的切换， 但是切换的目 标仍然是所述 MRN。
在另一种实现方式中， MRN可以通过 PDCCH启动 RACH命令实现触发
UE执行同步的过程， 如用 PDCCH format 1A中的 RACH命令， 触发 UE执行 同步。 根据不同的情况， 可以要求 UE可以先执行下行同步然后执行上行定时 调整， 考虑到兼容性， UE也可以只执行上行同步。
可以理解， 同步指示消息也可以是自定义的一个新消息， 本实施例对此不 做限定。 - - 图 4为本发明实施例三提供的一种同步方法的示意图。所述方法基于这样 的应用场景： 移动中继节点切换到目标基站并在与所述目标基站完成同步后， 通知 UE向自身执行同步， 该方法包括：
S41 : 接收移动中继节点的同步指示消息；
S42: 根据所述同步指示消息的指示， 向所述移动中继节点执行同步。 在一种实现方式， MRN可向 UE发送寻呼（paging )消息， 并在所述寻呼 消息中增加触发 UE执行同步指示消息， 以触发 UE进行***消息更新及执行 同步。
当 UE接收到 MRN的寻呼消息后， 可通过获取该寻呼消息中携带的指示 消息， 判断是否需要根据指示执行同步。
当 UE接收到 MRN的自切换命令后， 可通过获取该自切换命令中携带的 指示消息， 判断是否需要根据指示执行同步。但该自切换命令并非用于指示真 正的切换， 而是指示 UE切换到 MRN本身， 即指示 UE切换到其自身所在的 小区。 这里的 UE并非需要真正切换， 只是需要执行一次上下行同步。 同时考 虑到兼容性， 可以允许部分 UE执行真正的切换， 但是切换的目标仍然是所述 MRN。
本实施例中的 UE无需跟随发生切换的 MRN—起切换到目标基站， 而仅 根据指示向 MRN执行同步， 从而实现 UE、 MRN和目标基站三者间的同步， 保证 MRN切换后 Un口与 Uu口的同步。 可以理解， 本实施例中的同步指示 消息也可以是重配置消息或者其他新定义的消息， 只要能够起到相同的效果， 都在本发明保护范围之内。
在现有技术中， UE在执行向服务节点 （基站或 RN ) 同步时， 需要保证 UE的帧与服务节点的帧的同步，即使 UE与服务节点的帧在时间上是对齐的。 图 5为一种 UE与服务节点间帧同步的示意图。 在此图 5中， UE的一个帧 A1 与服务节点的一个帧 A2在时间上相对齐。 其中， 帧 A1和帧 A2中可各包括 n _ _ 个子帧 m, 帧 Al和帧 A2中相应的每个子帧在时间上也互相对齐， 保证 UE 与服务节点间的同步。 在 UE向服务节点执行同步时， 帧 A1为其当前帧， 帧 A2为其同步目标帧， UE通过调整其当前帧 A1的帧定时， 使其当前帧 A1与 同步目标帧 A2在时间上相对齐， 即完成了 UE与服务节点的同步。
图 6 为本发明实施例四提供的一种定时调整方法的示意图， 所述方法包 括：
S61 : 接收同步指示消息， 所述同步指示消息中携带当前帧与同步目标帧 间的定时偏差；
S62: 根据所述定时偏差调整当前帧的定时， 使当前帧的起始时刻与同步 目标帧中任一子帧的起始时刻相对齐。
本实施例无需使 UE当前帧与同步目标帧在时间上对齐，只需要其当前帧 的起始时刻与同步目标帧中任一子帧的起始时刻相对齐，此时 UE与服务节点 间并未实现同步， 但由于 UE与服务节点中某些子帧间实现了同步， 这种情况 可称之为子帧偏移同步。 实现子帧偏移同步后， UE可与服务节点在同步的子 帧上进行信息传递。 上述定时调整方法不仅局限于 UE侧使用， 网络侧的基站 或 RN等服务节点间也可利用该方法进行定时调整，从而实现彼此的子帧偏移 同步， 本实施例对此不做限定。 本实施例无需 UE实现真正同步， 仅通过子帧 偏移同步降低定时调整的复杂度。
在一种最优实现方式中， UE可根据当前帧与同步目标帧间的定时偏差， 找到同步目标帧中与当前帧的起始时刻相距最近的子帧， 调整当前帧的定时， 使当前帧的起始时刻与所找到的子帧的起始时刻相对齐。根据所述方法对当前 子帧进行定时调整时， 定时调整的范围较小。
为便于理解上述实施例， 下面举例进行具体说明。 图 7为一种当前帧与同 步目标帧间存在定时偏差的示意图， 图 7中当前帧 B与同步目标帧 C间存在 定时偏差 Τ, B帧与 C帧各包括 n个子帧， B帧内子帧用 bl、 b2、 b3 ~ ~ bn表示， C帧内子帧用 cl、 c2、 c3 cn表示。 图 8为本发明实施例提 供的一种优选的在当前帧与同步目标帧间实现子帧偏移同步的示意图。 在图 8 中， 当前帧 B的起始时刻与同步目标帧 C中子帧 b3的起始时刻对齐， 即实现 了 B帧与 C帧间的子帧偏移同步。 由于在图 7中当前帧 B的起始时刻距离同 步目标帧 C中的子帧 c3的起始时刻最近， 因此可调整当前帧 B的起始时刻与 子帧 c3的起始时刻对齐， 当然也可使当前帧 B的起始时刻与同步目标帧 C中 的其它子帧的起始时刻对齐。
在 2个通信实体执行同步的过程中，通常都是先执行下行同步， 然后执行 上行定时调整。 为便于理解， 依然以 UE和服务节点间的上行定时调整为例进 行说明。 UE进行定时调整也就是执行定时提前的过程， 由于 UE的上行传输 数据到达服务节点时会存在一定时间的延迟， 需要对 UE进行上行定时调整， 使得 UE的上行数据在服务节点期望的时刻到达。 而且当不同的 UE距服务节 点距离不同时， UE在进行上行传输时产生的延迟也不同。 图 9为本发明实施 例提供的不同 UE对应不同定时提前量的示意图。 在图 9中， UE1的上行数据 到达服务节点的延迟时间为 tl , 所述 tl可以作为 UE1的定时提前量； UE2的 上行数据到达服务节点的延迟时间为 t2,所述 t2可以作为 UE2的定时提前量。 当 UE1 比 UE2距离服务节点更近时， UE1比 UE2的上行传输延迟小， 所以 UE1的定时提前量也小于 UE2。 因此在图 9中， UE1的帧 E相对于服务节点 的帧 D的定时提前量为 tl , 而 UE2的帧 F相对于服务节点的帧 D的定时提前 量为 t2, 其中 tl<t2。
UE如果要执行定时调整， 需要接收服务节点发送的定时提前命令， 以根 据所述命令中的定时提前量执行定时调整。但是在现有技术中， 由于上行定时 调整的范围是有限的， 如果 MRN发生切换导致 Uu口与 Un口出现定时偏差 且这种定时偏差超过上行定时调整的范围，则 UE需要经过多次上行定时调整， 增大了调整的难度。例如，现有技术中，服务节点可利用 MAC ( Medium Access — —
Control, 媒体接入控制） RACH RAR ( Random Access Response, 随机接入响 应 ) 或 MAC CE ( Control Elements , 控制单元） 携带定时提前命令 ( TA Command, Timing Advance Command ) , 利用所述定时提前命令指示 UE进 行定时提前调整。 利用 MAC RACH RAR单次能够指示的最大调整幅度为 0.017ms , 而利用 MAC CE单次能够指示的最大调整幅度为 0.067ms, 如果系 统需要 0.5ms的调整幅度， 需要利用多条 MAC RACH RAR或 MAC CE指示 UE进行多次调整， 使得调整过程变得复杂。
本发明实施例五提供了一种上行定时调整方法。在本方法实施例中，服务 节点向 UE发送一定时调整指示命令，所述定时调整指示命令利用该命令中的 定时提前命令字段和该字段之前的预留字段指示 UE需要调整的定时提前量， 以扩大定时调整的范围。 UE接收到定时调整指示命令， 根据其中的定时提前 命令字段和预留字段的指示， 执行定时提前调整。
图 10为本发明实施例五提供的一种上行定时调整方法的示意图。 所述方 法包括：
S101： 向 UE发送 MAC RACH RAR或 MAC CE, 所述 MAC RACH RAR 或 MAC CE内包括定时提前命令字段和预留字段， 以指示 UE利用所述定时 提前命令字段和预留字段执行上行定时调整。
情况一： 在一种具体应用中， 服务节点向 UE发送 MAC RACH RAR, 在 MAC RACH RAR内携带定时提前命令。 图 1 1为本发明实施例提供的 MAC RACH RAR内携带的定时调整指示命令的示意图。 所述定时调整指示命令包 括 1 1位（ Bit ) 定时提前命令字段 TA Command和 1位预留字段 R, 所述 1 1 位定时提前命令字段可指示 2U = 2048种情况， 即定时提前值 TA可取 0、 1、
2 2047中的任意值， 但是考虑到兼容性， TA可以取 0、 1、 2 1282。 计算定时调整量的公式为 NTA = TAx l6Ts, 其中 Ts = 1 / ( 15000x 2048 ) s, 由 上式可以计算得到单次最大能够调整的时间 NTA- MAX为 0.67ms。 同时，本实施 — — 例结合 1位预留字段进行定时调整时间的指示。
在一种利用预留字段 R的方法中， 预留字段 R与定时提前命令字段结合 后形成一个整体字段， 可表示 1283 + 2048 = 3331种不同情况， 即定时调整指 示命令值可取为 0、 1、 2 3330中的任意值。 其中， 当 R = 0, 则定时调 整指示命令值可取 0、 1、 2 1282; 当 R = l , 则定时调整指示命令值可 取 1283、 1284 3330。 如果依然采用上述定时调整量计算公式， 则最 大调整时间 NTA-MAX为 1.73ms, 也就是说由于增加 1位预留字段 R可使最大 调整时间扩大一倍以上。
在另一种利用预留字段 R方法中，预留字段 R为 0时，定时提前值 TA可 取 0、 1、 2 1282中的任意值； 当 R为 1时， 定时调整量的计算公式可 变为 NTA = TAxTsxn, 这里 n可取大于 16的整数， 而 TA也可以取值为 0、 1、
2 2047, 则最大调整时间比原来的表示方法有所扩大。
在实际应用中， 预留字段还有其它的利用规则， 通过增加 1位指示信息， 使得可以指示的最大定时调整时间增大， 即可增大定时调整的范围。
情况二：在另一种具体应用中，服务节点向 UE发送 MAC CE,在 MAC CE 内携带定时提前命令。 图 12为本发明实施例提供的 MAC CE内携带的定时调 整指示命令的示意图。 所述定时调整指示命令包括 6位（Bit )定时提前命令 字段 TA Command和 2位预留字段 R, 所述 6位定时提前命令字段可指示 26 = 64种情况， 即定时提前值 TA可取 0、 1、 2 63中的任意值。 计算定时 调整量的公式为 NTA = (TA:31)xl6Ts, 其中 Ts = 1 / (15000 * 2048)s, 由上式可 以计算得到单次最大能够调整的时间 NTA-MAX为 0.017ms。
在一种利用预留字段 R的方法中， 2位预留字段 R与定时提前命令字段结 合后形成一个整体字段， 可表示 256种不同情况， 即定时调整指示命令值可取 为 0、 1、 2 255中的任意值。 如果依然采用上述定时调整量计算公式， 由于增加 2位预留字段 R可使最大调整时间变为 0.068ms ,即变为原来的 4倍。 — — 在另一种利用预留字段 R方法中， 2位预留字段 R为 00时， 定时提前值
TA可取 0、 1、 2 63中的任意值； 当 2位预留字段 R为 01时， 定时调 整量的计算公式可变为 NTA = TAxTsxnl ; 当 2位预留字段 R为 10时， 定时调 整量的计算公式可变为 NTA = TAxTsxn2; 当 2位预留字段 R为 11时， 定时调 整量的计算公式可变为 NTA = TAxTsxn3; 这里 nl、 n2、 n3可取大于大于 16 的整数且 3者可以不相等， 则 2位预留字段 R取值不同时， 可表示不同的最 大定时调整时间， 使得最大调整时间及定时调整范围扩大。
在实际应用中， 2位预留字段还有其它的利用规则， 通过增加 2位指示信 息， 使得定时调整的范围增大。
S102: UE接收服务节点发送的 MAC RACH RAR或 MAC CE,根据 MAC
RACH RAR或 MAC CE内定时提前命令字段和预留字段的指示， 执行上行定 时调整。
UE根据定时提前命令字段和预留字段的指示， 利用 S101 中确定的规则 计算出定时调整的时间， 可比现有技术获得更大的定时调整范围。
本发明实施例六提供了一种特殊子帧样式（Pattern )的调整方法。 所述特 殊子帧包括但不限于 MBSFN (组播单频网， Multicast Broadcast Single Frequency Network )子帧或空白 （ Blank )子帧。 图 13为本发明实施例六提供 的一种特殊子帧 Pattern的调整方法的示意图。
S131 : 在 MRN从源基站切换到目标基站并与目标基站执行同步后， 向 UE发送特殊子帧 Pattern变更消息，以指示所述 UE将其特殊子帧 Pattern调整 为与目标基站相一致。
在一种实现方式， MRN可向 UE发送寻呼（paging )消息， 以触发 UE进 行***消息更新， 所述寻呼消息中包括特殊子帧 Pattern调整信息， 该特殊子 帧 Pattern调整信息指示了需要对特殊子帧做出何种调整。
在另一种实现方式中， MRN可向 UE发送一自切换命令， 所述自切换命 - - 令为通知 UE切换到所述 MRN的切换命令， 并在该自切换命令中包含目标基 站的特殊子帧 Pattern, 以触发 UE更新特殊子帧 Pattem。
可以理解， MRN也可采用专用信令通知 UE进行特殊子帧 Pattern调整。 例如， 可以在重配置消息或自定义消息中携带特殊子帧 Pattern的变更信息， 本实施例对此不 ^1限定。
S132: UE接收到特殊子帧 Pattern变更消息后， 将其特殊子帧 Pattern调 整为新的特殊子帧 Pattern, 与目标基站或 MRN相一致。
UE可以从特殊子帧 Pattern变更消息获得目标基站的特殊子帧 Pattern,从 而将自身特殊子帧 Pattern调整为与目标基站或 MRN相一致。
对于 MRN发生切换的情况， 源 DeNB与目标 DeNB的特殊子帧 Pattern 可能不同， 当 MRN切换后， 终端根据切换后 MRN的指示， 调整自身特殊子 帧 Pattern, 可保证自身特殊子帧 Pattern与 MRN切换后的目标基站不相冲突。
图 14为本发明实施例七提供的一种切换同步方法的示意图， 所述方法包 括：
S141 : 确定切换到目标基站；
S142: 向目标基站执行同步， 并在执行同步期间内， 停止与 UE的数据传 输。
正如之前提到的， MRN与目标基站之间的接口为 Un口。 当 MRN向目标 基站执行同步即执行 Un口同步时， MRN可使其与 UE间传输数据的 Uu口保 持静默， 减少其 Uu口的数据传输对 Un口的同步形成的干扰。 停止与 UE的 数据传输可包括：停止接收 UE的数据或信息；或停止向 UE发送数据和信息。 可以理解， 在本步骤中， MRN可以不停止与 UE的数据传输， 而是按照 Un 口的定时时序发送 Uu口的数据和信息， 从而减小 Un口数据传送对 UE的测 量和同步等造成的影响。
图 15为本发明实施例八提供的一种切换同步方法的示意图， 所述方法包 - - 括：
S151 : 切换到目标基站并与目标基站执行同步；
S152: 通知 UE向本端执行同步， 并在 UE执行同步期间， 停止与目标基 站的数据传输。
在本实施例中， MRN与目标基站同步后， 由 UE执行与服务节点 （ MRN 或基站） 的同步， UE执行同步期间， 为了防止 Un口对 Uu口同步造成影响， MRN可停止与目标基站的数据传输， 即停止接收目标基站的数据或信息或停 止向目标基站发送数据和信息。 在一种实现方式中， UE可在完成同步之后， 向 MRN发送 RRC ( Radio Resource Control,无线资源控制） reconfig (重配置） complete (完成 )消息， 指示 MRN同步已经完成， 此时 MRN可恢复 Un口的 传输， 即 MRN可继续与基站实现通信。 可以理解， UE也可在同步过程中向 MRN发送 RRC reconfig complete消息， 通知 MRN切换可能在预定时间或者 几帧后完成，使得 MRN在预定时间或者几帧后启动 Un口的传输。 MRN也可 在 Uu口同步完成之后， 发送 RRC reconfig complete消息通知目标基站恢复 Un 口的数据传输。 可以理解， MRN也可以按照现有流程发送 RRC reconfig complete消息并完成 Uu口同步之后， 利用其他消息通知目标基站恢复 Un口 的数据传输。
可以理解， 实施例七和实施例八可结合使用， MRN在向目标基站执行同 步时， 可停止与 UE的数据传输； 当 MRN与目标基站完成同步后， 可通知 UE 向自身或目标基站执行同步， 并在 UE执行同步中， 停止与目标基站的数据传 输，使得 MRN完成在不同基站间的切换后， Un口与 Uu口彼此间的同步不会 形成干扰。
本领域人员可以理解， 上述各实施例之间可以互相结合得到新的实施例， 达到本领域技术人员所需要的有益效果。 下面给出一种优选的切换同步方法， 图 16为本发明实施例九提供的优选的切换同步方法的流程示意图， 该方法包 — — 括：
SI 61 : MRN、 源基站和目标基站进行切换协商。 具体的切换决定可由三 方间的任何一方故出。
S162: 源基站发送切换命令给所述 MRN。
SI 63: MRN在收到切换命令后， 执行切换， 并向目标基站执行同步。 具 体地， MRN可先进行下行同步， 然后进行上行定时调整。 在执行同步过程中， MRN可停止其与 UE之间的数据传输。
S164: MRN在完成与目标基站的同步后， 通知 UE向其执行同步。 在 UE 向其执行同步的过程中， MRN可停止与目标基站间数据传输， 即 Un口传输。 通知 UE 向其执行同步具体可以是： 向 UE发送自切换消息或寻呼消息指示 UE执行同步， 在所述消息内还可携带特殊子帧 Pattern变更消息、 源基站与目 标基站的定时偏差等。 MRN也可在此时向 UE发送 MAC RACH RAR或 MAC CE, 利用 MAC RACH RAR或 MAC CE内定时提前命令字段和预留字段指示 UE执行上行定时调整。
S165: UE向 MRN执行同步。具体地， UE可向 MRN执行子帧偏移同步， 具体子帧偏移同步过程参见之前实施例， 此处不再赘述。 UE还可根据 MRN 指示完成特殊子帧 Pattern变更。 UE可先执行下行同步， 然后执行上行定时调 整。 执行上行定时调整可包括： 接收 MRN发送的 MAC RACH RAR或 MAC CE, 根据 MAC RACH RAR或 MAC CE内定时提前命令字段和预留字段的指 示，执行上行定时调整，这样的上行定时调整可有效扩大上行定时调整的范围。 所述调整的具体实现过程可参加之前的实施例， 此处不再赘述。
S166: UE向 MRN执行同步后， 通知 MRN同步完成。 具体地， UE可向 MRN发送 RRC reconfig complete消息， 使得 UE根据该消息， 重启关闭的 Un 口传输。
本实施例可在 MRN切换到目标基站后， 实现 UE、 MRN与目标基站间的 — ~ 同步， 避免 MRN的 Uu口和 Un口间的偏差。 此外， 本实施例可避免切换同 步过程中 Uu口和 Un口的干扰， 可变更 UE的特殊子帧 Pattern, 还可通过 UE 与 MRN的子帧偏移同步使同步过程筒化， 以及可通过 MAC RACH RAR或 MAC CE扩大上行定时调整范围等。
图 17为本发明实施例十提供的一种移动中继节点的示意图， 该移动中继 节点包括：
第一同步模块 171 , 用于在接收到切换命令后， 与目标基站执行同步； 命令发送模块 172, 用于在与目标基站完成同步后， 向用户设备发送同步 指示消息， 以指示所述用户设备向本端执行同步。
所述移动中继节点还可包括： 变更通知模块， 用于向用户设备发送特殊子 帧 Pattern变更消息， 所述特殊子帧 Pattern变更消息用于指示所述用户设备将 其特殊子帧 Pattern调整为与目标基站相一致。 所述移动中继节点还可包括： 调整指示模块， 用于向用户设备发送媒体接入控制 （MAC ) 随机接入信 道（ RACH )随机接入响应 ( RAR )或媒体接入控制（ MAC )控制单元（ CE ) , 所述 MAC RACH RAR或 MAC CE内包括定时提前命令字段和预留字段， 以 利用所述定时提前命令字段和预留字段指示所述用户设备执行上行定时调整。
进一步地， 所述移动中继节点还可包括： 用户数据停止模块， 用于在向目 标基站执行同步期间， 停止与用户设备的数据传输。 更进一步地， 所述移动中 继节点还可包括： 基站数据停止模块， 用于在所述用户设备执行同步期间， 停 止与所述目标基站的数据传输。
本实施例的移动中继节点可指示 UE 向自身执行同步或进行特殊子帧 Pattern调整，使得 UE的帧同步配置或特殊子帧 Pattern与 MRN相一致，还可 利用 MAC RACH RAR或 MAC CE内定时提前命令字段和预留字段指示 UE 的定时调整， 还可在 Uu口或 Un口执行同步期间关闭另一空口， 避免形成干 扰。 — — 图 18为本发明实施例十一提供的一种用户设备的示意图， 该设备包括： 命令接收模块 181 , 用于接收移动中继节点发送的同步指示消息； 第二同步模块 182, 用于根据所述同步指示消息的指示， 向所述移动中继 节点执行同步。
所述用户设备还可包括： 样式变更模块， 用于接收特殊子帧 Pattern变更 消息， 并根据该特殊子帧 Pattern变更消息的指示， 将特殊子帧 Pattern调整为 与 MRN相一致。
所述用户设备还可包括： 调整接收模块， 用于接收移动中继节点发送的 MAC RACH RAR或 MAC CE, 并根据 MAC RACH RAR或 MAC CE内定时 提前命令字段和预留字段的指示， 执行上行定时调整。
图 19为本发明实施例十二提供的一种移动中继节点的示意图， 该移动中 继节点包括：
切换确定模块 191 , 用于确定切换到目标基站；
基站同步模块 192 , 用于向目标基站执行同步， 并在执行同步期间内， 停 止与 UE的数据传输。
所述移动中继节点还可包括： 用户同步模块， 用于在完成向目标基站的同 步后， 通知 UE执行同步， 并在 UE执行同步期间， 停止与目标基站的数据传 输。 本实施例所述移动中继节点可有效避免同步过程中， Uu口和 Un口间的 干扰。
图 20为本发明实施例十三提供的一种移动中继节点的示意图， 该移动中 继节点包括：
设定模块 201 , 用于对 MAC RACH RAR或 MAC CE内的定时提前命令 字段和预留字段进行设定， 以利用所述定时提前命令字段和预留字段指示 UE 执行上行定时调整；
消息发送模块 202, 用于向 UE发送所述 MAC RACH RAR或 MAC CE。 — — 图 21为本发明实施例十四提供的一种用户设备的示意图， 该用户设备包 括：
消息接收模块 211 , 用于接收服务节点发送的 MAC RACH RAR或 MAC 上行调整模块 212, 用于根据 MAC RACH RAR或 MAC CE内定时提前 命令字段和预留字段的指示， 执行上行定时调整。
上述实施例十三和十四可扩大用户设备上行定时调整的范围。
图 22为本发明实施例十五提供的一种用户设备的示意图， 该用户设备包 括：
指示接收模块 221 , 用于接收同步指示消息， 所述同步指示消息中携带当 前帧与同步目标帧间的定时偏差；
定时调整模块 222, 用于根据所述定时偏差调整当前帧的定时， 使当前帧 的起始时刻与同步目标帧中任一子帧的起始时刻相对齐。
进一步地， 所述定时调整模块 222可包括： 查找单元， 用于根据所述定时 偏差， 找到在同步目标帧中与当前帧的起始时刻相距最近的子帧； 调整单元， 用于调整当前帧的定时，使当前帧的起始时刻与所找到的子帧的起始时刻相对 齐。
本实施例的用户设备通过子帧偏移同步可降低定时调整的复杂度。可以理 解， 上述各设备实施例可以互相组合形成新的实施例， 本发明对此不做限定。
本领域普通技术人员可以理解上述方法实施例中的全部或部分流程，是可 以通过计算机程序来指令相关硬件完成的，所述的程序可存储于一计算机可读 取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中， 所述的存储介质可为磁碟、光盘、只读存储记忆体（Read-Only Memory, ROM ) 或随机存储记忆体 ( Random Access Memory, RAM )等。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通 — — 技术人员来说，在不脱离本发明原理的前提下， 上述实施例还可以做出若干改 进和变型， 这些改进和变型也应视为本发明的保护范围。 需要强调的是， 本发 明实施例尤其适用于 LTE-A ( LTE-Advance ) ***。

Claims

权 利 要 求
1、 一种同步指示方法， 其特征在于， 包括：
从源基站切换到目标基站并向目标基站执行同步；
在与目标基站完成同步后， 向用户设备发送同步指示消息， 以指示所述用 户设备向自身执行同步。
2、 根据权利要求 1所述的方法， 其特征在于， 所述向用户设备发送同步 指示消息包括：
向用户设备发送寻呼消息或自切换命令，在所述寻呼消息或自切换命令中 携带所述同步指示消息。
3、 根据权利要求 2所述的方法， 其特征在于， 所述寻呼消息或自切换命 令还携带有特殊子帧样式变更消息，所述特殊子帧样式变更消息用于指示所述 用户设备将特殊子帧样式调整为与所述目标基站相一致。
4、 根据权利要求 1所述的方法， 其特征在于， 还包括：
向用户设备发送媒体接入控制 MAC随机接入信道 RACH随机接入响应
RAR或媒体接入控制 MAC控制单元 CE, 所述 MAC RACH RAR或 MAC CE 内包括定时提前命令字段和预留字段，以利用所述定时提前命令字段和预留字 段指示所述用户设备执行上行定时调整。
5、 根据权利要求 1 - 4中任一项所述的方法， 其特征在于， 在向目标基站 执行同步期间， 停止与用户设备的数据传输。
6、 根据权利要求 5所述的方法， 其特征在于， 还包括：
在所述用户设备执行同步期间， 停止与所述目标基站的数据传输。
7、 一种同步方法， 其特征在于， 包括：
接收移动中继节点的同步指示消息；
根据所述同步指示消息的指示， 向所述移动中继节点执行同步。
8、 根据权利要求 7所述的方法， 其特征在于， 所述接收移动中继节点的 同步指示消息包括：
接收所述移动中继节点发送的寻呼消息或自切换命令，所述寻呼消息或自 切换命令中携带有所述同步指示消息。
9、 根据权利要求 8所述的方法， 其特征在于， 所述寻呼消息或自切换命 令还携带有特殊子帧样式变更消息，
相应地， 所述方法还包括： 根据所述特殊子帧样式变更消息的指示， 将特 殊子帧样式调整为与所述目标基站相一致。
10、 根据权利要求 7 - 9中任一项所述的方法， 其特征在于， 还包括： 接收移动中继节点发送的 MAC RACH RAR或 MAC CE;
根据 MAC RACH RAR或 MAC CE内定时提前命令字段和预留字段的指 示， 执行上行定时调整。
11、 一种定时调整方法， 其特征在于， 包括：
接收同步指示消息，所述同步指示消息中携带当前帧与同步目标帧间的定 时偏差；
根据所述定时偏差调整当前帧的定时，使当前帧的起始时刻与同步目标帧 中任一子帧的起始时刻相对齐。
12、 根据权利要求 11所述的方法， 其特征在于， 所述根据所述定时偏差 调整当前帧的定时，使当前帧的起始时刻与同步目标帧中任一子帧的起始时刻 相对齐包括：
根据所述定时偏差，找到同步目标帧中与当前帧的起始时刻相距最近的子 帧；
调整当前帧的定时，使当前帧的起始时刻与所找到的子帧的起始时刻相对 齐。
13、 一种移动中继节点， 其特征在于， 包括：
第一同步模块， 用于在接收到切换命令后， 与目标基站执行同步； 命令发送模块， 用于在与所述目标基站完成同步后， 向用户设备发送同步 指示消息， 以指示所述用户设备向本移动中继节点执行同步。
14、 根据权利要求 13所述的移动中继节点， 其特征在于， 还包括： 变更通知模块， 用于向用户设备发送特殊子帧样式变更消息， 所述特殊子 帧样式变更消息用于指示所述用户设备将特殊子帧样式调整为与目标基站相 一致。
15、 根据权利要求 13所述的移动中继节点， 其特征在于， 还包括： 调整指示模块， 用于向用户设备发送媒体接入控制 MAC 随机接入信道 RACH随机接入响应 RAR或媒体接入控制 MAC控制单元 CE, 所述 MAC RACH RAR或 MAC CE内包括定时提前命令字段和预留字段， 以利用所述定 时提前命令字段和预留字段指示所述用户设备执行上行定时调整。
16、 根据权利要求 13 - 15中任一项所述的移动中继节点， 其特征在于， 包括：
用户数据停止模块， 用于在向目标基站执行同步期间，停止与用户设备的 数据传输。
17、 根据权利要求 16所述的移动中继节点， 其特征在于， 还包括： 基站数据停止模块， 用于在所述用户设备执行同步期间，停止与所述目标 基站的数据传输。
18、 一种用户设备， 其特征在于， 包括：
命令接收模块， 用于接收移动中继节点发送的同步指示消息；
第二同步模块， 用于根据所述同步指示消息的指示， 向所述移动中继节点 执行同步。
19、 根据权利要求 18所述的用户设备， 其特征在于， 还包括：
样式变更模块， 用于接收特殊子帧样式变更消息， 并根据该特殊子帧样式 变更消息的指示， 将特殊子帧样式调整为与所述目标基站相一致。
20、 根据权利要求 18或 19所述的用户设备， 其特征在于， 还包括： 调整接收模块， 用于接收移动中继节点发送的 MAC RACH RAR或 MAC CE, 并根据 MAC RACH RAR或 MAC CE内定时提前命令字段和预留字段的 指示， 执行上行定时调整。
21、 一种用户设备， 其特征在于， 包括：
指示接收模块， 用于接收同步指示消息， 所述同步指示消息中携带有当前 帧与同步目标帧间的定时偏差；
定时调整模块， 用于根据所述定时偏差调整当前帧的定时，使当前帧的起 始时刻与同步目标帧中任一子帧的起始时刻相对齐。
22、 根据权利要求 21所述的用户设备， 其特征在于， 所述定时调整模块 包括：
查找单元， 用于根据所述定时偏差，找到在同步目标帧中与当前帧的起始 时刻相距最近的子帧；
调整单元， 用于调整当前帧的定时，使当前帧的起始时刻与所找到的子帧 的起始时刻相对齐。
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