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WO2011000161A1 - Procédé et dispositif de transfert - Google Patents

Procédé et dispositif de transfert Download PDF

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Publication number
WO2011000161A1
WO2011000161A1 PCT/CN2009/072594 CN2009072594W WO2011000161A1 WO 2011000161 A1 WO2011000161 A1 WO 2011000161A1 CN 2009072594 W CN2009072594 W CN 2009072594W WO 2011000161 A1 WO2011000161 A1 WO 2011000161A1
Authority
WO
WIPO (PCT)
Prior art keywords
pcid
relay station
base station
new
handover
Prior art date
Application number
PCT/CN2009/072594
Other languages
English (en)
Chinese (zh)
Inventor
张亮亮
常俊仁
李亚娟
李婷
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2009/072594 priority Critical patent/WO2011000161A1/fr
Priority to CN2009801466631A priority patent/CN102187706B/zh
Publication of WO2011000161A1 publication Critical patent/WO2011000161A1/fr

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Classifications

    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a handover method and apparatus. Background technique
  • a relay node In order to improve the data throughput of the cell edge users and also to expand the cell coverage area, a relay node has been introduced in the 3GPP LTE-ADVANCED system, and the relay node includes a fixed relay, a nomadic relay, and a mobile relay. .
  • each base station eNB evolved NodeB
  • relay station RN relay node
  • PCID physical cell identifier
  • UE User Equipment User Equipment
  • the PCID consists of a PSS (rimary synchronization signal) and a SSS (secondary synchronization signal).
  • PSS rimary synchronization signal
  • SSS secondary synchronization signal
  • Embodiments of the present invention provide a handover method and system to optimize a network handover procedure and improve efficiency.
  • a handover method including:
  • the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;
  • the PCID change message includes a new PCID for instructing the relay station to switch to the target base station using the new PCID.
  • a base station including:
  • a handover determining unit configured to obtain a decision that the relay station needs to be handed over to the target base station; the sending unit, configured to send a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict;
  • a receiving unit configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;
  • An allocating unit configured to allocate a new PCID to the relay station according to the PCID list
  • the notification unit is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.
  • the serving base station before the relay station switches to the target base station, the serving base station confirms that there may be a PCID conflict by negotiating with the target base station, and the serving base station allocates a new PCID to the relay station, instructing the relay station to enable the new PCID to be handed over to the target base station, which can be advanced. Identify and avoid PCID conflicts and avoid interference in network switching. DRAWINGS
  • FIG. 1 is a schematic flowchart of an embodiment of a handover method provided by the present invention
  • FIG. 2 is a schematic flowchart of another embodiment of a handover method provided by the present invention
  • FIG. 3 is a schematic flowchart of an embodiment of a relay station informing a subordinate terminal to access the relay station by using a new PCID;
  • FIG. 4 is a schematic flowchart of another embodiment of a handover method according to the present invention
  • FIG. 5 is a schematic flowchart of another embodiment of a handover method according to the present invention
  • FIG. 6 is a relay station of the present invention notifying a subordinate terminal to access by using a new PCID.
  • FIG. 7 is a schematic flow chart of another embodiment of a relay station informing a subordinate terminal to access the relay station by using a new PCID;
  • FIG. 8 is a relay station of the present invention notifying a subordinate terminal to access the relay station by using a new PCID.
  • FIG. 9 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of an embodiment of a handover determining unit
  • FIG. 11 is a schematic structural diagram of another embodiment of a handover determining unit
  • FIG. 12 is a schematic structural diagram of another embodiment of a base station according to an embodiment of the present invention. detailed description
  • each base station manages a plurality of relay stations RNs belonging to its cell, each of which manages a plurality of terminal UEs belonging thereto.
  • the system assigns a corresponding PCID to each eNB and the relay station, and the base station periodically sends its own PCID, so that the relay station or terminal subordinate to the base station synchronizes with the lower line through the PCID; the relay station periodically sends its own PCID, so that the terminal subordinate to the relay station passes the PCID. Synchronize with the next line. Due to the limited number of PCIDs, there is a need for PCID multiplexing.
  • Relay stations between different cells may be assigned the same PCID by their respective base stations, and base stations in the same cell may also allocate the same PCID at distant stations.
  • the original PCID of the mobile relay may be the same as the PCID of a certain relay station in the second cell, and the two may interfere with each other, so that the respective subordinates may receive the same.
  • the synchronization signal of the relay station may occur when a relay station moves within the cell range.
  • the same situation as the neighboring relay station PCID may occur. In the event of such a PCID collision, a relay station is required to change its PCID.
  • a first embodiment of the present invention provides a handover method for identifying and resolving identity conflicts in a network in advance of network handover.
  • the serving base station eNB1 of the relay station first confirms whether there is a PCID collision in the relay station handover to the target base station; if there is a possible PCID collision, the serving base station eNB1 needs to allocate a new PCID to the handover relay station; Switch to the target base station after the new PCID takes effect.
  • 1 is a schematic flowchart of an embodiment of a handover method according to the present invention. Referring to FIG. 1, the process includes:
  • the serving base station obtains a decision that the relay station needs to handover to the target base station eNB2; the serving base station may make a relay station handover decision according to the measurement report of the relay station and the radio resource management information, and determine the target base station to be handed over; the serving base station may also receive the transmission by the relay station.
  • the first handover request message is combined with the measurement report reported by the relay station and the situation between the base stations to make a handover decision. If the first handover request message includes a plurality of candidate target base stations, the serving base station selects one of the plurality of candidate target base stations as the target base station according to the situation.
  • the serving base station sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;
  • the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to switch resources.
  • the serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station.
  • the serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station.
  • the serving base station receives a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;
  • the target base station After receiving the negotiation message, if the target base station confirms that there may be a PCID collision, one or more PCIDs are selected for use by the relay in the target base station, and a handover request response is sent to the serving base station, where the handover request response includes a PCID list.
  • the list may be a set of PCIDs recommended by the target base station or a set of PCIDs that the target base station does not recommend.
  • the PCID list can be sent in the handover request response or sent as a separate message to the serving base station.
  • the target base station can judge the possibility of conflict according to the following conditions:
  • the serving base station allocates a new PCID to the relay station according to the PCID list, and sends a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.
  • the serving base station can assign a new PCID to the relay station in the following manner: Select a PCID from the PCID list as a new PCID to be assigned to the relay station; or, assign a new PCID to the relay station that is different from all PCIDs in the PCID list.
  • the PCID change message can contain the new PCID and the time to change the PCID. Used to notify the relay to use the new PCID when the time to change the PCID arrives.
  • the time to change the PCID can be an absolute frame number; it can also be a relative frame number, that is, starting with the current frame that received the PCID message.
  • the change time may also be the set time T (ms) of the timer.
  • the serving base station may further include a relay station switching time T h in the PCID change message, and the relay station switching time T h may also be carried in other messages.
  • the foregoing process further includes: the relay station interacts with its subordinate terminal, notifies its subordinate terminal that its service relay station does not change but changes the PCID, so it is not necessary to perform a regular handover procedure.
  • the relay station interacts with its subordinate terminals, notifying its subordinate terminals that its service relay station is unchanged but changes the PCID, so it is not necessary to perform the normal handover procedure steps including:
  • the relay station sends the second handover indication information to the terminal, which is used to indicate that the terminal does not change the PCID but does not need to perform the normal handover procedure.
  • the second handover indication information includes indication information, a new PCID, and the indication information indicates the attribution.
  • the service site remains unchanged;
  • the relay station changes and sends a new PCID. If there is a time to change the PCID, the relay station changes and sends a new PCID when the PCID change time arrives. In addition, the relay station also changes the information related to the PCID in the system, such as generating a new scrambling sequence using the new PCID. Correspondingly, after receiving the second handover indication information, the terminal changes the information related to the PCID in the system according to the indicated content, such as information related to the PCID in the process of generating the scrambling code in the system, and the new PCID may also be utilized. The original relay station remains synchronized.
  • the relay station receives the PCID change confirmation sent by the terminal.
  • the serving base station negotiates with the target base station to confirm that there may be a PCID conflict, and the monthly service base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station.
  • another embodiment of a handover method according to the present invention includes:
  • S201 The serving base station receives the measurement report sent by the relay station.
  • the relay station periodically or irregularly sends a measurement report to the serving base station, and the serving base station receives the measurement report.
  • the serving base station makes a handover decision, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;
  • the serving base station determines whether the relay station wants to switch according to the measurement report and the radio resource management information. If the handover is to be performed, the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to prepare resources for handover.
  • the serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station.
  • the serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station.
  • the target base station confirms that there may be a PCID conflict, selects one or more PCIDs for use by the relay station in the target base station, and sends a handover request response to the serving base station, where the handover request response includes a PCID list, where the PCID list includes at least one PCID;
  • the target base station If the target base station confirms that there may be a PCID collision, one or more PCIDs are recommended to the serving base station for use by the relay station in the target base station.
  • the target base station can judge the possibility of conflict based on the following conditions:
  • the target base station provides a list of PCIDs to the serving base station, and the list may be a PCID set recommended by the target base station or a PCID set not recommended by the target base station.
  • the PCID list can be sent in the handover request response or sent as a separate message to the serving base station. Carrying a PCID list in the handover request does not require adding a new message, and is well compatible with existing protocols.
  • the serving base station is a relay station according to the PCID list and the PCID usage of the current cell.
  • a new PCID is assigned and a PCID change message is sent to the relay station, the PCID change message containing a new PCID for informing the relay station to use the new PCID.
  • the serving base station can assign a new PCID to the relay station in the following manner: Select a PCID from the PCID list as a new PCID to be assigned to the relay station; or, assign a new PCID to the relay station that is different from all PCIDs in the PCID list.
  • the PCID change message can include the new PCID and the time to change the PCID. Used to notify the relay station to use the new PCID when the time to change the PCID arrives.
  • the serving base station may further include a relay station switching time T h in the PCID change message, and the relay station switching time T h may also be carried in other messages.
  • a new labeled C-RNTI allocated to the relay station may be included.
  • the C-RNTI is a 16-bit sequence.
  • the relay station may be newly marked with a shortening of less than 16 bits.
  • the rC-RNTI for example, lObit rC-RNTI can be used.
  • the relay station uses the shortened rC-RNTI to perform the intra-system scrambling code related process.
  • the serving base station allocates a shortened rC-RNTI of less than 16 bits to the terminal, and the less than 16-bit rC-RNTI can Corresponding to a 16-bit C-RNTI, this mapping relationship exists between the relay station and the base station.
  • the relay station After obtaining the r-CRNTI allocated by the serving base station, the relay station obtains the corresponding C-RNTI according to the mapping relationship, and then uses the C-RNTI to perform the process related to the scrambling code in the system. Since the number of relay stations that can be deployed within the service range of one base station is much smaller than that of the UE. Therefore, the label can be marked with fewer bits to ensure that the overhead in the air interface message is reduced, but it does not affect the process of the relay station or the base station extending the scrambling code in the LTE PHY.
  • the relay station sends an acknowledgement message to the serving base station to confirm acceptance of the PCID change.
  • the method further includes: the relay station notifying the neighboring neighbor cell of the new PCID.
  • the step of the relay station notifying the neighboring cell to the new PCID includes:
  • the relay station may notify the neighbor neighboring cell of the change information through the S1 or X2 message signaling, and let the neighbor cell update its respective neighbor cell list; the relay station may also pass its belonging In the upper-level site, the upper-level site notifies the neighboring cell of the change information by X2 message signaling, and causes the neighbor cell to update its neighbor cell list.
  • the change information may include: a new PCID of the relay station; the change information may also include: The new PCID of the relay station, the new working frequency at which the PCID works; In another mode, before changing its own PCID, the relay station can notify the neighboring neighboring cells of the change information through X2 message signaling, and let the neighboring cells update their respective The neighboring cell list; the relay station may also notify the neighboring neighboring cell of the change information by using the X2 message signaling by the upper-level station, and let the neighboring cell update its respective neighbor cell list.
  • the change information may include: a new PCID of the relay station, a change time; the change information may also include: a new PCID of the relay station, a new working frequency at which the PCID operates, and a change time.
  • the neighboring neighboring cell may send the change information to its neighboring cell and its subordinate terminal.
  • the neighboring area is sent to its own to avoid PCID confusion; the change information is sent to its own subordinate terminal through broadcast and/or dedicated messages for the subordinate terminal to change the time after the subordinate terminal uses the new PCID in the measurement report. It can be similar to the terminal that the service station notifies its subordinates.
  • the relay station interacts with its subordinate UEs, and notifies its subordinate UEs to access the relay station by using a new PCID;
  • the step may include the following process:
  • the relay station sends a handover command to the terminal to start the normal LTE handover procedure.
  • the terminal UEs will switch to the original relay station that sent the new PCID, which is a target cell ID for the UE.
  • the handover command is a conventional handover instruction of the LTE system, and includes information about a C-RNTI, a PCID, and the like used after the handover is allocated to the UE;
  • the relay station may send a handover command to the terminal immediately after receiving the PCID change message, or may send a handover command to the terminal after the t time after receiving the PCID change message.
  • the timing at which the relay station transmits the handover command can be considered in the following two ways:
  • the transmission delay T1 and the UE processing delay T2 of the relay station transmitting the handover command can be estimated in advance, and the time for changing the PCID is T, in order to ensure that the relay station has used the new relay before the handover is implemented.
  • PCID that is, t+Tl+T2 > T is satisfied in time, and the relay station needs to send a handover command to the terminal after the time of ⁇ -( ⁇ 1+ ⁇ 2);
  • the terminal after receiving the handover command of the relay station, the terminal starts to start the timer ⁇ 3, and completes the handover process before the timer ⁇ 3 expires.
  • the value of the timer ⁇ 3 can be from the following sequence. Medium choice: ⁇ 50ms, 100ms, 150ms, 200ms, 500ms, 1000ms, 2000ms ⁇ , in this case, the relay station can specify a timer value for the terminal. In order to ensure that the relay station has used the new PCID before the UE implements the handover, it must satisfy t+T 1 +T2+T3 > T in time. The relay station sends a handover command to the terminal after the time ⁇ -( ⁇ 1 + ⁇ 2+ ⁇ 3).
  • the UES After receiving the handover instruction, the UES starts a synchronization process with the target site;
  • the target site (the original relay station that sent the new PCID) responds to the synchronization, including uplink allocation and timing advance;
  • the terminal successfully accesses the target site.
  • the handover handover confirmation message indicates the UE handover procedure: 3 ⁇ 4.
  • the relay station sends a PCID change confirmation message to the serving base station, notifying that the PCID has been modified, and the handover process may be started;
  • This step is an optional step.
  • the relay station can directly initiate the handover procedure without sending a PCID change confirmation message to the serving base station; for example, the serving base station notifies the relay station to switch through the PCID change confirmation message or other message. It is time T h , then the relay station can switch to the target cell at the specified T h according to the indication of the serving base station without sending a PCID change confirmation message.
  • the serving base station sends a handover instruction message to the relay station, and provides information that the relay station switches to the target base station.
  • the handover request response sent by the serving base station to the relay station in step S204 includes the handover information of the relay, and the serving base station may not send the handover request message to the relay station, and the relay station may be in the After transmitting the PCID change confirmation message to the serving base station, the handover procedure is initiated and synchronized with the target base station.
  • the relay station initiates a handover process, and performs a synchronization process with the target base station to perform an access process.
  • a handover handover confirmation message indicates that the handover procedure of the relay station is completed.
  • the serving base station negotiates with the target base station to confirm that there may be a PCID conflict, and the monthly service base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station. It can identify and avoid PCID conflicts in advance and avoid interference in network switching.
  • the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps:
  • the relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station is changed, and the handover procedure is not performed.
  • the second switching indication information includes indication information, a new PCID.
  • the indication message indicates that no network switching is required.
  • the indication information indicates that the relay station to which the terminal belongs is unchanged, and no handover is required.
  • the indication information may be an explicit indication identifier, for example, one bit of information indicates that network switching is not required; the indication information may also be an implicit identifier, for example, carrying a new information by using a specific or special instruction message, implicitly notifying the terminal that The home service site is unchanged and no network switch is required.
  • the second handover indication information may include: indication information, a new PCID, and a change time. Used to inform the terminal: The relay station will use the new PCID when the change time arrives.
  • S302 The terminal obtains indication information, a new PCID, from the second handover indication information.
  • the terminal learns that the home relay station is unchanged according to the indication information and the new PCID, but the relay station
  • the PCID has changed and no network switching is required.
  • the terminal obtains the indication information, the new PCID, and the change time from the second handover indication information.
  • the terminal learns from the indication information that the service station of the terminal does not change, but the PCID of the service site changes, and no network handover is required.
  • the terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation process in the system.
  • the terminal changes the content related to the new PCID when the change time arrives, such as information related to the PCID in the scrambling code generation process in the system.
  • the terminal can also synchronize with the original relay station by using the new PCID.
  • the relay station changes and transmits a new PCID.
  • the relay station changes and transmits its own PCID when the change time arrives.
  • the relay station will also change the system and
  • PCID related information such as generating a new 4 special code sequence using the new PCID.
  • the terminal sends a UE PCID change confirmation message to the relay station.
  • the terminal sends a PCID change confirmation message to the relay station to notify the relay station to confirm the change process.
  • the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, optimizes the handover process, improves the switching efficiency, and saves the network. Resources.
  • the relay station when the PCID of the relay station changes, the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, optimizes the handover procedure, improves handover efficiency, and saves network resources.
  • the relay station may send a second handover indication information to each terminal of the subordinate, or may broadcast to all terminals of the subordinates.
  • the second handover indication information is broadcasted.
  • a new message may be designed, or the existing message may be used to carry the content of the second handover indication information.
  • the content of the second handover indication information may be carried in the mobilityControlInformation in the RRC connection reconfiguration message.
  • the indication information in the above steps may be represented by 1 bit. When the bit is 0, it indicates that the relay station for indicating the attribution of the terminal is unchanged, but the relay station PCID is changed, and the normal handover procedure is not performed; when the bit is 1, it is expressed as a regular Switching.
  • the system information message can be used to carry the content of the second handover indication information. Specifically, it can be implemented in the following two ways:
  • System messages can contain: New PCID.
  • System messages can also contain: New PCID and change time. Since the system message is not a handover message, the relay station sends a system message containing the PCID, which implies that the service station does not change, but its PCID is changed.
  • the system message may also explicitly include an indication that the service station is unchanged.
  • the system message can contain: New PCID, indication information.
  • System messages can also contain: New PCID, change time, indication information. For example, one bit can be used to indicate that the relay station to which it belongs is unchanged.
  • System messages can contain: New PCID.
  • System messages can also contain: New PCID and change time. Since the system message is not a handover message, the relay station sends a system message, which implies that the service station does not change, but its PCID is changed.
  • the system message may also explicitly include an indication that the service station is unchanged.
  • the system message can contain: New PCID, indication information.
  • System messages can also contain: New PCID, change time, indication information. For example, one bit can be used to indicate that its relay station is unchanged.
  • the indication information indicates that the relay station to which the terminal belongs is unchanged, and no handover is required.
  • the indication information may be an explicit indication identifier, for example, one bit of information indicates that network switching is not required; the indication information may also be an implicit identifier, for example, carrying a new information by using a specific or special instruction message, implicitly notifying the terminal that The home relay station is unchanged, and no network switching is required.
  • another embodiment of a handover method according to the present invention includes:
  • the relay station sends a first handover request message to the serving base station, where the one or more candidate target base stations of the handover are included.
  • the serving base station sends a handover decision according to the first handover request message, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;
  • the serving base station makes a handover decision according to the first handover request message, combined with the measurement report reported by the relay station, and the situation between the base stations. If the first handover request message includes a plurality of candidate target base stations, the serving base station selects one of the plurality of candidate target base stations as the target base station according to the situation.
  • the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to switch resources.
  • the serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID conflict in the target base station after the relay station switches to the target base station.
  • the serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station.
  • the processes of steps S403 to S410 are similar to the processes of steps S203 to S210 in the previous embodiment, and are not described herein.
  • the handover request is initiated by the relay station.
  • the serving base station negotiates with the target base station to confirm that there may be a PCID conflict.
  • the serving base station allocates a new PCID to the relay station, and then switches to the relay station after enabling the new PCID.
  • PCID collisions can be identified and avoided in advance to avoid interference in network handover.
  • step S406 the relay station interacts with its subordinate terminal to notify its subordinate terminal to access the relay station by using the new PCID, and may include the steps of S301 to S304.
  • another embodiment of a handover method according to the present invention includes:
  • S501 The serving base station receives the measurement report sent by the relay station.
  • the relay station periodically or irregularly sends a measurement report to the serving base station, and the serving base station receives the measurement report.
  • the serving base station makes a handover decision, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;
  • the serving base station determines whether the relay station wants to switch according to the measurement report and the radio resource management information. If the handover is to be performed, the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to prepare resources for handover.
  • the serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay station switches to the target base station.
  • the serving base station may carry the negotiation message in the handover request to implement compatibility with the existing protocol, or may directly send the negotiation message to the target base station.
  • the switching request message further includes frequency information, where the frequency information may include the first frequency, and may also include the first frequency and the second frequency, where the first frequency is a frequency used by the relay station to communicate with the terminal, and the second frequency is a relay station and a serving base station.
  • the frequency used for communication may also use another message to send frequency information.
  • the target base station confirms that there may be a PCID conflict, select one or more PCIDs for the relay to use in the target base station, and send a handover request response to the serving base station, where the handover request is ringing
  • the PCID list and the changed frequency information should be included, the PCID list including at least one PCID; if the target base station confirms that there may be a PCID conflict.
  • the target base station recommends one or more PCIDs to the serving base station for use by the relay station in the target base station.
  • the target base station can judge the possibility of conflict according to the following conditions:
  • the target base station provides a list of PCIDs to the serving base station, and the list may be a PCID set recommended by the target base station or a PCID set not recommended by the target base station.
  • the handover request response includes a frequency change information, and the frequency change information may include at least one of a new first frequency and a new second frequency.
  • the target base station can send a PCID list or frequency change information using a separate message.
  • the serving base station allocates a new PCID to the relay station according to the PCID list and the PCID usage of the current cell, and sends a PCID change message to the relay station, where the PCID change message includes a new PCID for notifying the relay station to use the new PCID.
  • the serving base station can assign a new PCID to the relay station in the following manner: Select a PCID from the PCID list as a new PCID to be assigned to the relay station; or, assign a new PCID to the relay station that is different from all PCIDs in the PCID list.
  • the PCID change message can contain the new PCID and the time to change the PCID. Used to notify the relay to use the new PCID when the time to change the PCID arrives.
  • the serving base station may further include a relay station switching time T h in the PCID change message, and the relay station switching time T h may also be carried in other messages.
  • the serving base station needs to notify the relay station of the new first frequency and the second frequency.
  • the PCID change message contains the new PCID and the new first frequency or the new second frequency.
  • the PCID change message contains the new PCID, the change time, and the new first frequency or the new second frequency.
  • the new first frequency is simultaneously sent to the relay station, and the relay station can perform band replacement before switching, and can also save signaling.
  • the serving base station may forward to the relay The station sends a first frequency change message to send a new first frequency to the relay station. In this way, the serving base station may not be limited to transmitting the first frequency change message in this step, for example, it may transmit the first frequency change message after the relay station handover to perform band replacement.
  • the relay station sends an acknowledgement message to the serving base station for confirming acceptance of the PCID change.
  • the method further includes: the relay station notifying the neighboring cell to the new PCID and the new first frequency.
  • the relay station interacts with its subordinate UEs, and notifies its subordinate UEs to access the relay station by using a new PCID;
  • the step may include the following process:
  • the relay station sends a handover command to the terminal to start the normal LTE handover procedure.
  • the terminal UEs will switch to the original relay station that sent the new PCID, which is equivalent to the identity of a target base station for the UE.
  • the handover command is a conventional handover command of the LTE system, and includes information about a C-RNTI, a PCID, and the like used after the handover is allocated to the UE. If the first frequency changes, the new first frequency is also included.
  • the relay station may send a handover command to the terminal immediately after receiving the PCID change message, or may send a handover command to the terminal after t time.
  • the t time is obtained by referring to the description of step 6-1 in the previous embodiment.
  • the UES After receiving the handover instruction, the UES starts a synchronization process with the target site;
  • the target site (the original relay station that sent the new PCID) responds to the synchronization, including uplink allocation and timing advance;
  • the terminal successfully accesses the target site.
  • the handover handover confirmation message indicates the UE handover procedure: 3 ⁇ 4.
  • the relay station sends a PCID change confirmation message to the serving base station, notifying that the PCID has been modified, and the handover process may be started;
  • the serving base station sends a handover request message to the relay station, and provides information that the relay station switches to the target base station.
  • the handover request response sent by the serving base station to the relay station in step S504 includes the handover information of the relay, and the serving base station may not send the handover information.
  • the handover request message is sent to the relay station, and the relay station may initiate a handover procedure to synchronize with the target base station after transmitting the PCID change confirmation message to the serving base station.
  • the relay station After receiving the handover request message, the relay station starts a handover procedure, and performs a synchronization process with the target base station, where the target base station responds to the synchronization, including uplink allocation and timing advance;
  • S510 The relay station successfully accesses the target station, and sends a handover confirmation message indicating that the handover process of the relay station is completed.
  • the serving base station before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID collision, and the serving base station allocates a new PCID to the relay station, and then switches to the target base station after the relay station enables the new PCID. Identify and avoid PCID conflicts in advance to avoid interference in network switching. Further, in this embodiment, the target base station can change the frequency used by the relay station, and the relay station can change the used frequency before or after the handover.
  • the new first frequency and the new second frequency may be the operating frequency of one carrier, or may be the operating frequency of multiple carriers.
  • the operating frequency between the service station and the terminal may be on multiple carriers, specifically, the new first frequency operating frequency (between the monthly service station and the terminal) may be one.
  • the frequency of the carrier is F1 (ie, the center frequency of the carrier) or the frequencies of multiple carriers such as F3, F4 and F5.
  • the above new second frequency operating frequency (for use between the relay and the base station) may be a frequency of one carrier such as F1 (i.e., the center frequency of the carrier) or frequencies of multiple carriers such as F3, F4 and F5.
  • Carrier aggregation in LTE-A refers to the convergence of two or more component carriers to support a transmission bandwidth greater than 20 MHz. According to its capability, the terminal can receive one or more component carriers at the same time.
  • the LTE-A terminal can receive transmissions of multiple component carriers at the same time, and the LTE terminal can only receive one component carrier.
  • a relay station can receive transmissions of multiple component carriers simultaneously.
  • step S506 the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps:
  • the relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station and the first frequency fl of the communication are changed, and the handover procedure is not performed.
  • the second handover indication information includes indication information, a new PCID, and a new first frequency.
  • the indication message indicates that no network switching is required.
  • the first frequency is the frequency of communication between the relay station and the terminal. Rate.
  • the second handover indication information may include: indication information, a new PCID, a new first frequency, and a change time. Used to inform the terminal: The relay station will send a new PCID with the new first frequency when the change time arrives.
  • S602 The terminal obtains the indication information, the new PCID, and the new first frequency from the second handover indication information.
  • the terminal learns that the home relay station does not change according to the indication information, the new PCID, and the new first frequency, but the PCID and the communication frequency of the relay station change, and no network handover is required.
  • the terminal obtains indication information, a new PCID, a new first frequency, and a change time from the second handover indication information.
  • the terminal learns that the relay station of the terminal does not change according to the indication information, but the PCID of the relay station changes, and no network switching is required.
  • the terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation in the system, etc.; searches and receives the first frequency of the PCID with the new first frequency to synchronize with the relay station.
  • the terminal changes the content related to the new PCID when the change time arrives, such as information related to the PCID in the scrambling code generation process in the system, and the first to update and search the PCID by using the new first frequency. Frequency to synchronize with the relay.
  • the terminal can also synchronize with the original relay station by using the new PCID and the new first frequency.
  • the relay station changes and transmits a new PCID.
  • the relay station changes and transmits its own PCID when the change time arrives.
  • the relay station will also change the system and
  • PCID related information such as generating a new 4 special code sequence using the new PCID.
  • the terminal sends a UE-PCID change confirmation message to the relay station.
  • step S603 There is no strict execution order between step S603 and step S604, and it can be executed in any order.
  • the relay station when the relay station PCID and the communication frequency of the relay station and the terminal change, the relay station sends indication information to the subordinate terminal, instructing the subordinate terminal to change only the PCID and the communication frequency but does not perform handover, optimize the handover procedure, and improve the handover. Efficiency, saving network resources.
  • step S506 the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps: S701: The relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station is changed, and the handover procedure is not performed.
  • the second handover indication information includes indication information, a new PCID.
  • the indication message indicates that no network switching is required.
  • the second handover indication information may include: indication information, a new PCID, and a change time. Used to inform the terminal: The relay station will use the new PCID when the change time arrives.
  • S702 The terminal obtains indication information, a new PCID, from the second handover indication information.
  • the terminal learns that the home relay station does not change according to the indication information and the new PCID, but the PCID of the relay station changes, and no network handover is required.
  • the terminal obtains the indication information, the new PCID, and the change time from the second handover indication information.
  • the terminal learns that the relay station to which the terminal belongs is unchanged according to the indication information, but the PCID of the relay station changes, and no network switching is required.
  • the terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation process in the system.
  • the terminal changes the content related to the new PCID when the change time arrives, such as information related to the PCID in the scrambling code generation process in the system.
  • the terminal can also synchronize with the original relay station by using the new PCID.
  • the relay station changes and transmits a new PCID.
  • the relay station changes and transmits its own PCID when the change time arrives.
  • the relay station also changes the information related to the PCID in the system, such as generating a new 4 special code sequence using the new PCID.
  • S704 The terminal sends a UE-PCID change confirmation message to the relay station.
  • the relay station sends third handover indication information to the terminal, where the relay station to which the terminal belongs is unchanged, but the first frequency fl of the relay station communicating with the terminal is changed.
  • the second switching indication information includes indication information and a new first frequency.
  • the indication message indicates that no network switching is required.
  • the first frequency is the frequency of communication between the relay station and the terminal.
  • the third handover indication information may include: indication information, a new first frequency, and a change time. Used to inform the terminal: The relay station will use the new first frequency when the change time arrives.
  • S706 The terminal obtains the indication information from the third handover indication information, the new first frequency; the terminal learns that the home relay station does not change according to the indication information, the new first frequency, but the relay station and the relay station The communication frequency of the terminal has changed, and no network switching is required.
  • the terminal obtains the indication information, the new first frequency, and the change time from the second handover indication information.
  • the terminal learns that the home relay station does not change according to the indication information, but the communication frequency with the relay station changes, and the network switching is not required, and the first frequency is updated with the new first frequency to synchronize with the relay station.
  • the terminal updates the first frequency of the PCID with the new first frequency when the change time arrives.
  • the terminal adopts a new first frequency and synchronizes with the relay station.
  • the terminal does not have to parse the PCID for synchronization every frame. After the first frequency changes, the terminal can synchronize immediately, or can analyze the PCID of the relay station when necessary, and synchronize with the relay station.
  • S708 The terminal sends a terminal frequency UE-F change confirmation message to the relay station.
  • step S701 to step S706 may be sequentially performed, and the relay station notifies the terminal of the new PCID and the new fl; in another embodiment, The process of step S704 to step S706 may be performed first, the relay station notifies the terminal of the new fl, and then the process of step S701 to step S703 is performed, the relay station notifies the terminal of the new PCID; or the flow of step S701 to step S703 may be performed in parallel. The flow of step S704 to step S706 will notify the terminal of the new PCID and the new fl.
  • step S506 the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, and may include the process of step S701 to step S703. Further, in step 510: the relay station successfully accesses the relay station. After the target site, the process of step S704 to step S706 is further included. That is, the relay station can modify the first frequency to communicate with the terminal before switching to the target base station, or modify the second frequency to communicate with the terminal after switching to the target base station.
  • the relay station when the serving base station allocates a new PCID to the relay station, the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, and uses a separate message to send the new first frequency information. Notify the terminal, optimize the switching process, improve the switching efficiency, and save network resources.
  • another embodiment of a handover method of the present invention includes: S801: The relay station sends a first handover request message to the serving base station, where the one or more candidate target base stations of the handover are included.
  • the serving base station sends a handover request according to the first handover request message, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;
  • the serving base station makes a handover decision according to the first handover request message, combined with the measurement report reported by the relay station, and the situation between the base stations. If the first handover request message includes a plurality of candidate target base stations, the serving base station selects one of the plurality of candidate target base stations as the target base station according to the situation.
  • the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to switch resources.
  • the serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station.
  • the serving base station may carry the negotiation message in the handover request to implement compatibility with the existing protocol, or may directly send the negotiation message to the target base station.
  • the switching request message further includes frequency information, where the frequency information may include the first frequency, and may also include the first frequency and the second frequency, where the first frequency is a frequency used by the relay station to communicate with the terminal, and the second frequency is a relay station and a serving base station.
  • the frequency used for communication may include the serving base station, can also use a message sending frequency information.
  • steps S803 to S810 are similar to the processes of steps S503 to S510 in the previous embodiment, and are not described herein.
  • the serving base station before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID collision, the serving base station allocates a new PCID to the relay station, and then switches to the target base station after the relay station station enables the new PCID. It can identify and avoid PCID conflicts in advance and avoid interference in network switching. Further, in this embodiment, the target base station can change the frequency used by the relay station, and the relay station can change the used frequency before or after the handover.
  • the program when executed, may include the flow of an embodiment of the methods as described above.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory.
  • the present invention also provides an embodiment of a handover apparatus for identifying and resolving identity conflicts in a network in advance when a subordinate relay station switches to a target base station.
  • the switching device can be a base station.
  • the serving base station eNB1 of the relay station first confirms whether the original PCID of the relay station is the same as the existing PCID in the target base station; if the PCID of one relay station in the target base station is the same as the original PCID of the handover relay station, the service
  • the base station eNIB needs to allocate a new PCID to the handover relay station; the relay station switches to the target base station after the new PCID is valid.
  • an embodiment of a base station provided by the present invention includes:
  • the determining unit 901 is configured to obtain a decision that the relay station needs to be handed over to the target base station, and the sending unit 902 is configured to send a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether the PCID conflicts;
  • the receiving unit 903 is configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message;
  • An allocating unit 904 configured to allocate a new PCID to the relay station according to the PCID list
  • the notification unit 905 is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.
  • the base station before the relay station switches to the target base station, the base station negotiates with the target base station to confirm that there may be a PCID conflict, and the base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station, which can be identified in advance. Avoid PCID conflicts and avoid interference in network switching.
  • an embodiment of the handover determining unit 901 includes: a measurement report receiving unit 1001, configured to receive a measurement report of a relay station;
  • the determining unit 1002 is configured to determine, according to the measurement report and the radio resource management information, that the relay station needs to switch to the target base station.
  • the handover request receiving unit 1101 is configured to receive a handover request message of the relay station, where the handover request message includes one or more candidate target base stations that are handed over;
  • the determining unit 1102 is configured to make a handover decision according to the first handover request, and select one target base station from the candidate target base stations.
  • the handover request further includes: frequency information; the handover request response further includes: new frequency information; the notification unit is further configured to send a frequency change message to the relay station, where the frequency change message includes a new frequency information.
  • another embodiment of a base station includes: a handover determining unit 1201: configured to obtain a decision that a relay station needs to handover to a target base station; and a sending unit 1202, configured to send a handover request to a target base station
  • the switching request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict;
  • the receiving unit 1203 is configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message;
  • the allocating unit 1204 is configured to allocate a new PCID to the relay station according to the PCID list;
  • the notification unit 1205 is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.
  • the acknowledgment receiving unit 1206 is configured to receive a PCID change confirmation message sent by the relay station, and the information sending unit 1207 is configured to send information about the handover to the target base station to the relay station.
  • the base station negotiates with the target base station to confirm that there may be a PCID collision, and the base station allocates a new PCID to the relay station, and the relay station enables a new one.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un dispositif de transfert. Le procédé comprend les étapes suivantes : lorsqu'il est acquis qu'une station de relais requiert un transfert de réseau, une station de base de desserte négocie avec une station de base cible afin de déterminer si des conflits d'identifiants de cellule physique (PCID) existent; la station de base de desserte alloue un nouvel identifiant PCID à la station de relais et ordonne à la station de relais de passer à la station de base cible à l'aide du nouvel identifiant PCID. Les conflits d'identifiants PCID peuvent être identifiés et évités à l'avance au moyen de la présente invention de sorte à éviter des interférences dans un transfert de réseau.
PCT/CN2009/072594 2009-07-02 2009-07-02 Procédé et dispositif de transfert WO2011000161A1 (fr)

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CN2009801466631A CN102187706B (zh) 2009-07-02 2009-07-02 一种切换方法和装置

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CN102790971A (zh) * 2011-05-17 2012-11-21 中兴通讯股份有限公司 中继节点的小区标识确定方法及系统
WO2013155643A1 (fr) * 2012-04-17 2013-10-24 Telefonaktiebolaget L M Ericsson (Publ) Atténuation du brouillage dans un réseau de communications sans fil
EP2693785B1 (fr) * 2011-03-31 2019-12-25 Nec Corporation Système de communication mobile et procédé de commande de station de relais
CN113676960A (zh) * 2020-05-13 2021-11-19 维沃移动通信有限公司 切换方法及装置、终端设备及网络设备

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CN106332148B (zh) * 2015-06-23 2020-04-03 中兴通讯股份有限公司 基站组网方法和装置
CN106470456B (zh) * 2015-08-14 2019-09-17 电信科学技术研究院 一种在网终端进行中继选择的方法及终端

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WO2008060021A1 (fr) * 2006-11-14 2008-05-22 Electronics And Telecommunications Research Institute Procédé de transfert intercellulaire avec station relais mobile
CN101400095A (zh) * 2007-09-28 2009-04-01 华为技术有限公司 切换过程中目标小区的确定方法、用户设备、基站及系统

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EP2693785B1 (fr) * 2011-03-31 2019-12-25 Nec Corporation Système de communication mobile et procédé de commande de station de relais
WO2012142824A1 (fr) * 2011-04-22 2012-10-26 中兴通讯股份有限公司 Procédé et système de transfert cellulaire
CN102790971A (zh) * 2011-05-17 2012-11-21 中兴通讯股份有限公司 中继节点的小区标识确定方法及系统
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