WO2011050535A1 - 一种上行同步方法、基站和用户设备 - Google Patents

一种上行同步方法、基站和用户设备 Download PDF

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Publication number
WO2011050535A1
WO2011050535A1 PCT/CN2009/074728 CN2009074728W WO2011050535A1 WO 2011050535 A1 WO2011050535 A1 WO 2011050535A1 CN 2009074728 W CN2009074728 W CN 2009074728W WO 2011050535 A1 WO2011050535 A1 WO 2011050535A1
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WIPO (PCT)
Prior art keywords
component carrier
user equipment
message
random access
resource corresponding
Prior art date
Application number
PCT/CN2009/074728
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English (en)
French (fr)
Inventor
常俊仁
李亚娟
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 CN200980146458.5A priority Critical patent/CN102227939B/zh
Priority to PCT/CN2009/074728 priority patent/WO2011050535A1/zh
Publication of WO2011050535A1 publication Critical patent/WO2011050535A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an uplink synchronization method, a base station, and a user equipment.
  • the UE may acquire uplink synchronization by using random access. Since the LTE system is a single carrier system, That is, there is only one component carrier, so when the UE is disconnected or switches, the uplink synchronization can be obtained through a random access procedure.
  • LTE Long Term Evolution
  • CA Carrier Aggregation
  • the UE User Equipment, User Equipment
  • the UE cannot use the same TA (Timing Advance) value on multiple component carriers used.
  • TA Timing Advance
  • the base station configures different component carriers on different repeaters, or the component carriers of different frequencies pass different scatter paths, or the UE uses two different component carriers and two non-cooperative connections.
  • the TAs of multiple component carriers of the UE may be different.
  • the UE and the serving eNB may be disconnected, and how the UE regains uplink synchronization with multiple CCs in the shortest time. It becomes a problem. Furthermore, when the UE switches from one eNB (source eNB) to another eNB (target eNB), if multiple UEs are configured at the same time CC, then how the UE obtains uplink synchronization with these newly configured CCs in the shortest time is also a problem to be solved.
  • the inventor has found that at least the following problems exist in the prior art: In a scenario of a multi-carrier application, if the UE performs random access on a plurality of component carriers one by one, a large synchronization delay is generated, if the UE is in multiple components. When multiple random access procedures are performed simultaneously on a carrier, more random access resources are consumed.
  • the embodiment of the present invention provides an uplink synchronization method, a base station, and a user equipment, which reduces the delay of uplink synchronization of the UE when the random access resources are saved as much as possible.
  • An embodiment of the present invention provides an uplink synchronization method, including:
  • the embodiment of the invention further provides an uplink synchronization method, including:
  • the uplink bandwidth allocation information Acquiring the uplink bandwidth allocation information while receiving the contention resolution message or the RRC connection re-establishment message, and determining, according to the indication of the uplink bandwidth allocation information, the component carrier that needs to perform synchronization by the user equipment, and the bandwidth resource corresponding to the component carrier And the bandwidth resource corresponding to the component carrier is used by the user equipment to send a random access preamble on the component carrier;
  • the embodiment of the invention further provides a base station, including:
  • An information distribution unit configured to receive a random access preamble sent by the user equipment on the first component carrier, and send uplink bandwidth allocation information to the user equipment while transmitting the contention resolution message or the RRC connection re-establishment message, And indicating, by the user equipment, a component carrier that performs synchronization and a bandwidth resource corresponding to the component carrier, where the bandwidth resource corresponding to the component carrier is used by the user equipment to send a random access preamble on the component carrier;
  • a timing indication unit configured to receive a random access preamble sent by the user equipment on a bandwidth resource corresponding to the component carrier, and send a timing advance command to the user equipment, to notify a timing advance value of the component carrier To the user equipment.
  • the embodiment of the invention further provides a user equipment, including:
  • a first sending unit configured to send a random access preamble to the base station on the first component carrier
  • the information acquiring unit is configured to acquire uplink bandwidth allocation information while receiving the contention resolution message or the RRC connection re-establishment message Determining, according to the indication of the uplink bandwidth allocation information, a component carrier that needs to perform synchronization by the user equipment, and a bandwidth resource corresponding to the component carrier, where the bandwidth resource corresponding to the component carrier is used by the user equipment to send random on the component carrier
  • a second sending unit configured to send a random access preamble to the base station on the bandwidth resource corresponding to the component carrier
  • a timing receiving unit configured to receive a timing advance command from the base station, and obtain a timing advance value of the component carrier according to the indication of the timing advance command.
  • the embodiment of the present invention receives the random access preamble sent by the user equipment on the first component carrier, and sends the uplink bandwidth allocation information while transmitting the contention resolution message or the RRC connection re-establishment message.
  • the user equipment needs to perform the synchronized component carrier and the corresponding resource to notify the user equipment, so that the user equipment can use the resource to send the random access preamble, and obtain the timing advance value of the component carrier that needs to be synchronized, on the component carrier that needs to be synchronized. Synchronize, no need to use
  • the user equipment performs a random access procedure for each component carrier one by one, and can reduce the uplink synchronization delay of the user equipment when the random access resources are saved as much as possible.
  • FIG. 1 is a schematic diagram of an uplink synchronization method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of content of an uplink bandwidth allocation message according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of still another content of an uplink bandwidth allocation message according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a base station device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of an uplink synchronization method according to an embodiment of the present disclosure, where the method includes:
  • S11 Receive a random access preamble sent by the user equipment on the first component carrier, and send uplink bandwidth allocation information to the user equipment to send the contention resolution message or the RRC connection re-establishment message to indicate that the user equipment is required. Performing a synchronized component carrier and a bandwidth resource corresponding to the component carrier, where the bandwidth resource corresponding to the component carrier is used by the user equipment to send a random access preamble on the component carrier;
  • S12 Receive a random connection sent by the user equipment on a bandwidth resource corresponding to the component carrier. And entering a preamble, and sending a timing advance command to the user equipment, to notify the user equipment of the timing advance value of the component carrier.
  • the base station receives the random access preamble sent by the user equipment on the first component carrier, and sends the uplink bandwidth allocation information to the user equipment while transmitting the contention resolution message or the RRC connection re-establishment message. Instructing the user equipment to perform the synchronized component carrier and the corresponding bandwidth resource, so that the random access preamble that the user equipment can send on the bandwidth resource can send after receiving the random access preamble sent by the user equipment.
  • the timing advance command enables the user equipment to obtain the timing advance value of the component carrier that needs to be synchronized, which is beneficial for the user equipment to perform uplink synchronization on the required component carrier.
  • the component carrier that requires the user equipment to perform synchronization may have one or more.
  • the first component carrier in this embodiment is a certain component carrier when the user equipment initially performs random access to the base station device in a scenario where the timing advance value of the multiple component carriers that the user equipment needs to perform access is different.
  • And may be a primary component carrier (Anchor CC) of the user equipment, where the primary component carrier may be a primary component carrier of the user equipment before the serving eNB is disconnected (this primary component carrier may be regarded as a specific cell, or For the serving cell, or the primary component carrier indicated in the handover command when the user equipment switches to the target base station (this primary component carrier can be regarded as a specific cell, or called a serving cell).
  • the base station may notify the UE of the component carrier and the corresponding bandwidth resource that needs to be synchronized by the UE, so that the UE sends the preamble on the component carriers by using the corresponding bandwidth resource, and receives the UE sending the resource on the resource.
  • the preamble is used to calculate the timing advance value corresponding to the component carrier according to the relevant preamble of each component carrier, and notify the user equipment of the calculated timing advance value by using the timing advance command, so that the user equipment can perform the method according to each timing advance value.
  • the user equipment is not required to perform a random access procedure for each component carrier one by one, and the random access resources can be saved as much as possible. In case of reducing the delay of the uplink synchronization of the user equipment.
  • the component carrier that requires the user to perform synchronization may be multiple, and may be other component carriers of the plurality of component carriers of the user equipment that are different from the first component carrier TA value.
  • the component carrier that needs to perform synchronization by the user may also be a component carrier newly allocated by the base station to the user equipment.
  • the user equipment needs to perform a subsequent synchronization process on the newly allocated component carrier, which is equivalent to performing carrier component replacement. .
  • the uplink bandwidth allocation information may include at least one identifier of a component carrier and a bandwidth resource corresponding to the component carrier.
  • Some carriers may have the same timing advance value in multiple component carriers, or may share the same timing advance value.
  • the timing advance values of the carriers can be shared, that is, the same information is not required to be included in the uplink bandwidth allocation information.
  • the component carriers are divided into multiple component carriers.
  • the timing advance value of all component carriers in each component carrier group is equal, and the uplink bandwidth allocation information includes at least one identifier of a representative component carrier in the component carrier group and the representative component carrier. Corresponding bandwidth resources.
  • the component carrier group is divided according to the timing advance value of the component carrier, and the component carriers in the same component carrier group can share the same timing advance value, that is, the timing advance values of the component carriers in the same component carrier group are equal,
  • the timing advance value of one carrier in the component carrier group may be selected to represent the timing advance value of all component carriers in the component carrier group, and the selected component carrier is also a representative component carrier. It can be understood that if the timing advance value of a component carrier is different from other component carriers, it can also constitute a group itself, that is, the number of component carriers in each component carrier group is not fixed and can be any positive integer.
  • a representative component carrier can be used to replace other component carriers in the component carrier group, and only one component carrier indicates the bandwidth resources corresponding to all component carriers in the carrier group in the uplink bandwidth allocation information. Upstream bandwidth allocation information.
  • the sending the uplink bandwidth allocation information to the user equipment may include: carrying the uplink bandwidth allocation information in a contention resolution message or a radio resource control protocol connection re-establishment The information is sent to the user equipment.
  • carrying the uplink bandwidth allocation information in other messages it is not necessary to send separate uplink bandwidth allocation information, which can save additional signaling overhead.
  • the method may further include: when the user equipment is required to perform a change of the primary component carrier (which may be regarded as a specific cell, referred to as a serving cell), using the contention resolution message and the radio resource control protocol.
  • the connection re-establishment message, or the custom message indicates that the user equipment switches to the new primary component carrier or serving cell.
  • the so-called primary component carrier or serving cell is characterized in that it provides the user equipment with input parameters for generating an encryption and integrity protection key.
  • the first component carrier sent by the user equipment may be the original primary component carrier of the user equipment. If the original primary component carrier or the serving cell is selected by the user equipment, the base station may change the selection of the user equipment, that is, the user equipment is changed to the serving cell or the master.
  • the component carrier that the user equipment needs to perform synchronization may be a newly allocated carrier for the user equipment, and the corresponding serving cell of the newly allocated carrier may be different from the serving cell before the user equipment, and therefore, when notifying the user equipment that the synchronized component carrier is required to perform synchronization It is also necessary to notify the user that the device switches to the new corresponding cell.
  • the original primary component carrier here is relative to the component carrier that needs to be changed, and its name does not limit its substance.
  • FIG. 2 is a schematic diagram of still another method for uplink synchronization according to an embodiment of the present invention, where the method includes:
  • S21 Send a random access preamble to the base station on the first component carrier.
  • S22 Acquire an uplink bandwidth allocation information, and determine, according to the indication of the uplink bandwidth allocation information, a component carrier that needs to perform synchronization by the user equipment, and the component carrier corresponding to the component carrier. a bandwidth resource, where the bandwidth resource corresponding to the component carrier is used by the user equipment to send a random access preamble on the component carrier;
  • S23 Send a random access preamble to the base station on the bandwidth resource corresponding to the component carrier;
  • S24 Receive a timing advance command from the base station, and obtain a timing advance value of the component carrier according to the indication of the timing advance command.
  • the user equipment sends a random access preamble to the base station on the first component carrier, and connects Receiving the uplink bandwidth allocation information, and transmitting the random access preamble on the corresponding resource by using the indication of the information, so that the user equipment can acquire the timing advance command from the base station, thereby obtaining the timing advance value of the component carrier that needs to perform synchronization, Therefore, the user equipment performs the timing adjustment of the corresponding carrier according to each timing advance value.
  • This embodiment is applicable to a scenario in which the timing advance values of the plurality of component carriers that the user equipment needs to perform synchronization are different, so that the user equipment is not required for each component.
  • the carrier performs a random access procedure one by one, which can reduce the uplink synchronization delay of the user equipment while saving random access resources as much as possible.
  • the acquiring the uplink bandwidth allocation information may include: receiving a contention resolution message or a RRC connection re-establishment message, and acquiring the contention re-establishment message or the RRC connection re-establishment message.
  • the base station can carry the uplink bandwidth allocation information in other messages, and does not need to send separate uplink bandwidth allocation information, which can save additional signaling overhead.
  • the determining, according to the indication of the uplink bandwidth allocation information, that the component carrier that needs to perform synchronization by the user equipment and the bandwidth resource corresponding to the component carrier may include: at least, according to the uplink bandwidth allocation information An identifier of the component carrier determines a bandwidth resource corresponding to the identifier of the component carrier as a bandwidth resource corresponding to the component carrier.
  • some carriers may share the same timing advance value in multiple component carriers. When the timing advance values of some carriers are the same, it is not necessary to include related information of the carriers in the uplink bandwidth allocation information.
  • the following implementation manner may be adopted: determining, according to the identifier of the representative component carrier in the at least one component carrier group included in the uplink bandwidth allocation information, the bandwidth resource corresponding to the identifier of the representative component carrier As the bandwidth resources corresponding to the component carriers in the component carrier group, timing advance values of all component carriers in the component carrier group are equal.
  • the method uses the timing advance value of one carrier in a certain carrier group to represent the timing advance value of all component carriers in the component carrier group, and the user equipment can grasp the timing group in the carrier group only by acquiring the timing advance value of one carrier.
  • the timing advance value of the carrier It can be understood that the number of component carriers in each component carrier group is not fixed, and may be any Meaning a positive integer.
  • the random access preamble transmitted on the bandwidth resource corresponding to the component carrier is the same preamble as the random access preamble transmitted on the first component carrier. If the preamble transmitted on the carrier that needs to perform synchronization is the same as the preamble transmitted on the first component carrier for the first time, the base station can be prevented from blindly detecting the preamble.
  • the random access preamble sent by the user equipment on the bandwidth resources corresponding to the component carriers may be randomly selected by the user equipment. If the preamble is randomly selected by the user equipment, the base station needs to perform the random access preamble.
  • the blind detection process which only slightly increases the detection complexity of the eNB, does not affect the implementation effect, which is not limited in this embodiment.
  • the method may further include: switching to a new primary component carrier or a serving cell according to the indication of the contention resolution message, the RRC connection re-establishment message, or the custom message (the primary component carrier or the serving cell The characteristics are the same as before), and the new primary component carrier or the physical layer cell identifier (PCI), frequency and other parameters of the serving cell are used as input parameters for generating an encryption and integrity protection security key.
  • PCI physical layer cell identifier
  • the cell is selected by itself, and the base station can change the selection of the user equipment, that is, instruct the user equipment to change the serving cell or the main component carrier.
  • the component carrier that the user equipment needs to perform synchronization may be a newly allocated carrier for the user equipment, and the corresponding serving cell of the newly allocated carrier may be different from the serving cell before the user equipment, and therefore, when notifying the user equipment that the synchronized component carrier is required to perform synchronization
  • the user equipment also needs to be notified to switch to the new corresponding cell.
  • the user equipment can complete such handover according to the contention resolution message, the RRC connection re-establishment message, or the instruction of the customized message, and according to the indication.
  • the physical layer cell identifier (PCI), frequency and other parameters of the new serving cell or the primary component carrier are used as input parameters for generating an encryption and integrity protection security key, so that the subsequent connection re-establishment process is not affected by the serving cell or the primary component carrier.
  • PCI physical layer cell identifier
  • frequency and other parameters of the new serving cell or the primary component carrier are used as input parameters for generating an encryption and integrity protection security key, so that the subsequent connection re-establishment process is not affected by the serving cell or the primary component carrier. The impact of switching.
  • the embodiment is particularly applicable to user equipments in different network devices (such as base stations). Inter-switching, and the scenario where the user equipment is out of synchronization on the original multiple component carriers (ie, the link between the user equipment and the network device occurs).
  • the switching target base station or the base station that re-establishes the connection with the user equipment can send the uplink bandwidth allocation information, indicating which carriers the user equipment needs to perform uplink synchronization, and the bandwidth resources corresponding to the carriers, so that the user equipment can follow the method embodiment of the present invention.
  • the process completes the uplink synchronization process on the carrier that needs to perform synchronization.
  • the subsequent part of the embodiment of the present invention will specifically describe the corresponding uplink synchronization process for several different application scenarios.
  • FIG. 3 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention, where the method includes:
  • S31 The UE sends a random access preamble (Preamble) to the serving eNB.
  • Preamble a random access preamble
  • the UE when the UE detects that multiple CCs that are being used are out of synchronization, it is determined that a disconnection occurs between the UE and its serving eNB, and the UE may perform an interaction with the serving eNB.
  • the RRC (Radio Resource Control) connection re-establishment process.
  • the re-establishment process may begin by transmitting a preamble by the UE, and the UE may select the preamble on the serving cell (or the calling CC).
  • the UE may randomly select a preamble to be sent to the eNB from the CC (also called the primary CC) selected as the serving cell before the link is dropped; for the FDD (Frequency Division Duplex, In the frequency division duplex mode, the UE may randomly select a preamble from the downlink CC selected as the serving carrier pair (also called the primary CC, which is described in the previous embodiment). And sent to the eNB through the corresponding uplink CC.
  • the UE may also arbitrarily select one CC/CC pair from multiple CC/CC pairs before the link is dropped, and then randomly select a preamble to send to the eNB on the selected CC/CC pair.
  • the TDD mode and the FDD mode are not described separately in the following.
  • the CC mentioned may refer to the CC in the TDD mode or the CC pair in the FDD mode.
  • the serving cell or the primary CC mentioned in the embodiment of the present invention is a CC having the following characteristics, that is, the physical layer cell identifier of the serving cell or the primary CC of the UE. Parameters such as PCI and frequency are used as input parameters for generating encryption and integrity protection keys. Therefore, the serving cell and the primary CC herein are only a term for a specific component carrier among all component carriers, and there is no additional limitation.
  • the serving eNB sends a random access response message to the UE.
  • the UE After receiving the random access response message, the UE sends an RRC connection reestablishment request message to the serving eNB.
  • the C-RNTI Cell Radio Network Temporary Identifier
  • the C-RNTI Cell Radio Network Temporary Identifier
  • the serving eNB After receiving the RRC connection re-establishment request message sent by the UE, the serving eNB learns that the uplink out-of-synchronization has occurred on the multiple CCs used by the UE based on the C-RNTI identifier of the UE.
  • the serving eNB sends a contention resolution message to the UE, and carries an uplink bandwidth allocation message in the contention resolution message. Depreciation. If the CCs do not have the same threshold, the eNB may allocate the bandwidth resources of the random access preamble allocated to the UE on the multiple CCs that need the UE to perform uplink synchronization.
  • the uplink bandwidth allocation message in the process is used to indicate that the eNB allocates the bandwidth resource of the random access preamble allocated to the UE on the multiple CCs that need the UE to perform uplink synchronization; the contention resolution message is a RACH (Randic Access Channel, Random access channel) Message 4.
  • the eNB may send the content of the uplink bandwidth allocation message as a field of the contention resolution message to the UE in the contention resolution message, that is, the contention resolution message includes multiple CCs that the eNB needs to perform uplink synchronization by the UE.
  • the multiple CCs that require the UE to perform uplink synchronization may be identical to the multiple CCs used before the UE is disconnected.
  • the eNB may also reconfigure other CCs for the UE as the multiple CCs that need the UE to perform uplink synchronization.
  • the eNB may include, in the uplink bandwidth allocation message, identifiers of CCs that need to perform uplink synchronization allocated to the UE, and uplink time-frequency resource information (also called UL bandwidth information) of the transmitting preamble corresponding to the CCs. Interest).
  • FIG. 4 is a schematic diagram of content of an uplink bandwidth allocation message according to an embodiment of the present invention.
  • the content includes identification information of multiple CCs that the UE performs uplink synchronization.
  • the identification of a total of n CCs from CC1 to CCn is shown in Figure 4a, where each CC has its corresponding upstream (UL, Uplink) resource for transmitting preamble.
  • the foregoing process sends the uplink bandwidth allocation message in the contention resolution message, but in an actual application, the uplink bandwidth allocation message may also be sent as an independent message, and the independent uplink bandwidth allocation message and the contention resolution message are sent. There may be no strict sequence between the two, which is not limited in this embodiment.
  • multiple CCs indicated in the uplink bandwidth allocation message may be grouped, that is, multiple CCs that perform uplink synchronization by the UE may be grouped according to whether one TA can be shared, and the packet information is broadcasted or dedicated. Order to send to the UE.
  • the eNB only needs to select one representative CC in each group and its corresponding uplink resource notification of the transmitting preamble, and the UE obtains the representative after performing uplink synchronization on the representative CC.
  • the TA value of CC, and the obtained TA value is the TA value of other CCs belonging to one CC group to the representative CC.
  • the information included in the uplink bandwidth allocation message may be: an identifier of each representative CC of the plurality of CCs that need to perform uplink synchronization, and an identifier for transmitting the random access preamble allocated to the UE on the representative CCs.
  • Uplink time-frequency resource information It can be understood that the representative CC can be arbitrarily designated by the eNB from multiple CCs allocated to the UE in the CC group.
  • FIG. 4b is a schematic diagram of still another content of an uplink bandwidth allocation message according to an embodiment of the present invention. In FIG. 4b, there are identifiers of a total of n representative CCs from CC1 to CCn. Unlike FIG.
  • each representative CC may represent a group of CCs, and the TA values of all CCs in a group of carrier carriers are the same. In this case, it is only necessary to allocate the bandwidth resource for transmitting the preamble on the representative CC.
  • the contention resolution message and the uplink bandwidth allocation message may be sent in various forms.
  • the message may be in the form of a MAC (Media Access Control) control PDU (Protocol Data Unit), or may be an RRC message or a physical layer message. It is not a limitation.
  • MAC Media Access Control
  • PDU Protocol Data Unit
  • S36 The serving eNB sends an RRC connection re-establishment message to the UE.
  • S37 The UE sends a preamble to the serving eNB on the bandwidth resource indicated in the uplink bandwidth allocation message.
  • the UE After receiving the contention resolution message and the uplink bandwidth allocation message sent by the eNB, the UE can learn the bandwidth resource indicated in the uplink bandwidth allocation message, and the UE can randomly select one preamble to send to the serving eNB on the bandwidth resource; In an implementation manner, the UE may also send the random access preamble sent in process S31 to the eNB on the bandwidth resource. If the qualified UE uses the same preamble sent in the process S31 as the preamble sent this time, the complexity of the eNB blind detection preamble can be reduced.
  • the serving eNB sends a TA adjustment command to the UE.
  • the TA adjustment command sent by the eNB to the UE may include a TA value that needs to be adjusted by multiple CCs that need uplink synchronization.
  • the serving eNB may change the serving cell/primary CC when the UE is disconnected when the UE performs RRC connection re-establishment.
  • the UE may select the serving cell/primary CC by itself. If the serving cell/primary CC is selected by the UE, the serving eNB may also change the selected serving cell/main CC of the UE.
  • the serving eNB may add a Serving Cell/Main CC Change Indication to the message when the contention resolution message or the RRC connection re-establishment message is sent, indicating that the UE should replace the original serving cell with the indicated
  • the new serving cell that is, the serving eNB needs to notify the UE of the identity information of the serving cell/primary CC that the eNB reselects for the UE in the contention resolution message or the RRC connection re-establishment message.
  • the eNB may also notify the UE to change the serving cell/primary CC with a separate custom message, which may be referred to as a serving cell/primary CC change message.
  • the UE may use the new serving cell/main CC indication indicated in these messages.
  • the parameter may include a PCI (physical layer cell identity) or a frequency of the new serving cell/primary CC, and these parameters may be used as input parameters for generating an encryption and integrity protection security key, so that subsequent parameters
  • the RRC connection setup and the RRC connection setup completion process are not affected by the change of the serving cell.
  • the foregoing embodiment is directed to a scenario in which a UE is disconnected in a carrier aggregation scenario.
  • the UE may send a preamble to the eNB for connection re-establishment, and the eNB needs to perform at the UE.
  • the uplink bandwidth allocation message is carried in the contention resolution message, and does not need to send a separate uplink bandwidth allocation message, which can save some resources. It can be understood that the CC that the UE needs to perform synchronization may be the same as or different from the original CC used before the UE is disconnected.
  • FIG. 5 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention, where the method includes:
  • the UE sends the random access Preamble to the serving eNB. Specifically, the UE may send a Preamble to its serving eNB to initiate an RRC connection re-establishment process when it detects that multiple CCs in use are out of synchronization.
  • the serving eNB sends a random access response message to the UE.
  • the UE sends an RRC Connection Re-establishment Request message to the serving eNB.
  • the C-RNTI identifier of the UE is included in the RRC Connection Re-establishment Request message.
  • the serving eNB sends a contention resolution message to the UE.
  • the serving eNB can learn that the C-RNTI identifiers of the UEs included in the RRC connection re-establishment request message sent by the UE have been uplink out-of-synchronization.
  • the serving eNB sends an RRC connection re-establishment message to the UE, and carries an uplink bandwidth allocation message in the RRC connection re-establishment message.
  • the value if the CC does not have the same value of the TA, the eNB may allocate the bandwidth resource of the random access preamble allocated to the UE on the multiple CCs that the UE needs to perform the uplink synchronization, and use the uplink bandwidth allocation information to indicate the A bandwidth resource for transmitting a random access preamble allocated to a UE on a plurality of CCs that require the UE to perform uplink synchronization.
  • the eNB may send the content included in the uplink bandwidth allocation message as one field of the RRC connection re-establishment message, that is, the RRC connection re-establishment message may be included on multiple CCs in which the UE performs uplink synchronization.
  • the multiple CCs that require the UE to perform uplink synchronization may be the same as or different from the multiple CCs used before the UE is dropped.
  • the eNB may include, in the uplink bandwidth allocation message, an identifier of each CC that needs to perform uplink synchronization allocated to the UE, and uplink time-frequency resource information of the transmitting preamble corresponding to the CCs;
  • multiple CCs indicated in the uplink bandwidth allocation message may be grouped, that is, multiple CCs that need to perform uplink synchronization by the UE according to whether a TA can be shared, and the packet information is sent to the broadcast or dedicated signaling.
  • the UE has not been repeatedly described herein for what has been described in the previous embodiment.
  • the uplink bandwidth allocation message may be sent as a separate message instead of being carried in the RRC connection re-establishment message. There may be no strict transmission order between the independent uplink bandwidth allocation message and the RRC connection re-establishment message.
  • the UE sends the preamble to the serving eNB on the bandwidth resource indicated by the uplink bandwidth allocation message, and the preamble may be randomly selected by the UE. Alternatively, the preamble sent in the process S51 may be used as the preamble sent this time to reduce the eNB blindness. The complexity of detecting preambles.
  • S58 The UE sends an RRC Connection Reestablishment Complete message to the eNB.
  • the serving eNB sends a TA adjustment command to the UE.
  • the TA adjustment command sent by the eNB to the UE may include a TA value that needs to be adjusted by multiple CCs that need uplink synchronization.
  • the serving eNB may add a Serving Cell/Main CC change indication to the message when transmitting the contention resolution message or the RRC connection re-establishment message.
  • the UE is instructed to replace the original serving cell/primary CC with the indicated new serving cell/primary CC, which is not described in this embodiment.
  • the foregoing embodiment is directed to a scenario in which a UE is disconnected in a carrier aggregation scenario, and the uplink bandwidth allocation message is carried in an RRC connection re-establishment message, and does not need to send a separate uplink bandwidth allocation message, which may save some resources.
  • the uplink bandwidth allocation message is sent together with the contention resolution message carried in process S35 or the RRC connection re-establishment message carried in S56.
  • the uplink bandwidth allocation message may be sent to the UE as a separate message in parallel with the contention resolution message or the RRC connection re-establishment message, where the parallel transmission is sent at the same time.
  • the uplink bandwidth allocation message may also be sent as a separate message at any time between the two processes of sending the contention resolution message and the RRC connection re-establishment message, which is not limited in this embodiment.
  • FIG. 6 is a schematic diagram of still another uplink synchronization method according to an embodiment of the present invention, where the method includes:
  • the UE receives a handover command message from the source eNB or an RRC connection reconfiguration message with a mobility management field.
  • S62 The UE sends the random access Preamble to the target eNB.
  • the target eNB sends a random access response message to the UE.
  • the UE sends a handover complete message or an RRC connection reconfiguration complete message to the target eNB.
  • the C-RNTI identifier of the UE may be included in the handover complete message or the RRC Connection Reconfiguration Complete message.
  • the target eNB After receiving the handover complete message or the RRC connection reconfiguration complete message, the target eNB determines, according to the indication in the handover complete message or the RRC connection re-establishment complete message, that the multiple CCs used by the UE do not have the same The target eNB sends a contention resolution message to the UE, and carries an uplink bandwidth allocation message in the contention resolution message.
  • the specific competition resolution message sending process can be Referring to the previous embodiment, no further description is made here. It can be understood that the uplink bandwidth allocation message can be sent separately from the contention resolution message.
  • the UE sends a preamble to the target eNB on the bandwidth resource indicated by the uplink bandwidth allocation message, and the preamble may be randomly selected by the UE. Alternatively, the preamble sent in the process S62 may be used as the preamble sent to reduce the target eNB. The complexity of blind detection of preamble.
  • the target eNB sends a TA adjustment command to the UE.
  • the TA adjustment command sent by the target eNB to the UE may include a TA value that needs to be adjusted by multiple CCs that need uplink synchronization.
  • the foregoing embodiment is directed to a scenario in which a UE is handed over in a carrier aggregation scenario.
  • the target eNB allocates resources to the UE on the CC that the UE needs to perform synchronization, so that the UE is in the UE.
  • the preamble is sent on the corresponding resource, so that the target eNB completes the synchronization process, and the UE does not need to perform a random access procedure for each CC one by one, and the UE uplink synchronization delay can be reduced while saving resources as much as possible.
  • FIG. 7 is a schematic diagram of a base station device according to an embodiment of the present invention.
  • the base station includes: an information distribution unit 71, configured to receive a random access preamble sent by a user equipment on a first component carrier, and resolve the transmission content.
  • the message or the RRC connection re-establishment message sends the uplink bandwidth allocation information to the user equipment to indicate the component carrier that needs the user equipment to perform synchronization and the bandwidth resource corresponding to the component carrier, where the bandwidth resource corresponding to the component carrier is used. Transmitting, by the user equipment, a random access preamble on the component carrier;
  • the timing indication unit 72 is configured to receive a random access preamble sent by the user equipment on a bandwidth resource corresponding to the component carrier, and send a timing advance command to the user equipment, to obtain a timing advance value of the component carrier. Notifying the user device.
  • the base station device may indicate that the user equipment needs to perform the synchronized CC and the corresponding resources, so that the user equipment can initiate a subsequent synchronization process, and the user equipment does not need to perform a random access procedure for each component carrier one by one, which can be reduced as much as possible to save resources.
  • the information distribution unit 71 may include: a bearer sending module, configured to send the uplink bandwidth allocation information to the user equipment in a contention resolution message or a RRC connection re-establishment message. Through the bearer transmission process, the uplink bandwidth allocation information is not required to be separately signaled, and part of the signaling overhead can be saved.
  • the base station may further include: a handover notification unit; when the user equipment is required to perform the serving cell/main CC change, the handover notification unit is configured to use the contention resolution message, the RRC connection re-establishment message, or The custom message indicates that the user equipment is handed over to the new serving cell/master cc.
  • FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment includes: a first sending unit 81, configured to send a random access preamble to a base station on a first component carrier; and an information acquiring unit 82, And acquiring the uplink bandwidth allocation information, and determining, according to the indication of the uplink bandwidth allocation information, the component carrier that needs to perform synchronization by the user equipment, and the component carrier corresponding to the component carrier a bandwidth resource, where the bandwidth resource corresponding to the component carrier is used by the user equipment to send a random access preamble on the component carrier;
  • a second sending unit 83 configured to send a random access preamble to the base station on the bandwidth resource corresponding to the component carrier
  • the timing receiving unit 84 is configured to receive a timing advance command from the base station, and obtain a timing advance value of the component carrier according to the indication of the timing advance command.
  • the user equipment may synchronize the CCs that need to perform synchronization by acquiring the uplink bandwidth allocation information, and do not need to perform an independent uplink synchronization process for each CC. Reduce the delay of uplink synchronization of user equipment by saving resources as much as possible.
  • the information acquiring unit 82 may include: an information receiving module, configured to receive a contention resolution message or a RRC connection re-establishment message, and obtain the contention-resolved message Or the RRC connection re-establishment of the uplink bandwidth allocation information in the message.
  • the information acquiring unit 82 may further include: a first resource determining module, configured to determine, according to the identifier of the at least one component carrier included in the uplink bandwidth allocation information, the identifier corresponding to the component carrier The bandwidth resource is used as the bandwidth resource corresponding to the component carrier.
  • the information obtaining unit 82 may further include: a second resource determining module, configured to determine, according to the identifier of the representative component carrier in the at least one component carrier group included in the uplink bandwidth allocation information, The bandwidth resource corresponding to the identifier of the component carrier is used as the bandwidth resource corresponding to the component carrier in the component carrier group, and the timing advance values of all component carriers in the component carrier group are equal.
  • the second sending unit 83 may include: a selecting sending module, configured to select a random access preamble sent by the first receiving unit on the first component carrier as a bandwidth resource corresponding to the component carrier Random access preamble sent on. If the preamble transmitted on the carrier that needs the synchronization of the user equipment is the same as the preamble transmitted on the first component carrier, the base station can be prevented from blindly detecting the preamble transmitted by the user equipment.
  • the user equipment may further include: a change execution unit, configured to switch to the new serving cell/main according to the received contention resolution message, the RRC connection re-establishment message, or the indication of the customized message CC, and the physical layer cell identifier, frequency and other parameters of the new serving cell/primary CC are used as input parameters for generating an encryption and integrity protection security key.
  • a change execution unit configured to switch to the new serving cell/main according to the received contention resolution message, the RRC connection re-establishment message, or the indication of the customized message CC, and the physical layer cell identifier, frequency and other parameters of the new serving cell/primary CC are used as input parameters for generating an encryption and integrity protection security key.
  • the base station and the user equipment provided in the embodiment of the present invention can perform the process in the foregoing method embodiment, and the effect of reducing the uplink synchronization delay of the user equipment under the condition of saving resources as much as possible is achieved.
  • 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

一种上行同步方法、 基站和用户设备 技术领域
本发明涉及通信技术领域，特别涉及一种上行同步方法、基站和用户设备。
背景技术
在现有 LTE ( Long Term Evolution, 长期演进 )技术中， 当 UE发生掉链 或者在 eNB之间进行切换时， UE可以使用随机接入的方式获取上行同步， 由 于 LTE系统是一个单载波系统， 即只有一个组成载波，所以 UE在掉链或者发 生切换的时候， 都可以通过一个随机接入过程而获得上行同步。
为了满足 IMT-Advanced (高级国际移动通信 )的要求， 支持高达 1G的峰 值数据速率， 3GPP LTE- ADVANCED ( LTE演进版）系统目前已经同意将载波 汇聚（CA, Carrier Aggregation )技术作为其扩展系统带宽的方法。 载波汇聚 的主要思想就是将多个组成载波（CC, Component Carrier ) 汇聚成一个高于 20MHz的载波，以支持高速数据输率。例如，系统的下行带宽可由 5个 20MHz 的组成载波汇聚而成。
对于多载波系统而言， 在一些应用场景下， UE ( User Equipment, 用户设 备）在使用的多个组成载波上是不能使用相同的 TA ( Timing Advance, 定时 提前）值。 例如， 当基站在不同的中继器（Repeater )上配置了不同的组成载 波， 或者不同频率的组成载波经过了不同的散射路径， 或者 UE使用两个不同 的组成载波与两个非协作的接入点通信时， UE的多个组成载波的 TA可以不 同。 在其他一些场景下， 同样可能出现不同组成载波具有不同 TA值的情况， 在此不再——列举。 当 UE当前在服务 eNB ( eNodeB, 基站）上使用的多个 组成载波都发生失步时， UE与服务 eNB之间会发生掉链， UE如何在最短的 时间内与多个 CC重新获得上行同步就成为一个问题。此夕卜，当 UE从一个 eNB (源 eNB )切换到另外一个 eNB (目标 eNB )时， 如果同时为 UE配置了多个 CC,那么 UE该如何在最短的时间内与这些新配置的 CC获得上行同步也是需 要解决的问题。
发明人发现现有技术至少存在以下问题： 在多载波应用的场景下， 如果 UE在多个组成载波上逐个执行随机接入，则会带来较大的同步时延，如果 UE 在多个组成载波上同时执行多个随机接入过程， 则消耗较多的随机接入资源。
发明内容
本发明实施例提供一种上行同步方法、基站和用户设备，在尽量节约随机 接入资源的情况下减小 UE上行同步的时延。
本发明实施例提供一种上行同步方法， 包括：
接收用户设备在第一组成载波上发送的随机接入前导码，在发送竟争解决 消息或无线资源控制协议连接重建立消息的同时向用户设备发送上行带宽分 配信息，以指示需要用户设备执行同步的组成载波及所述组成载波对应的带宽 资源，所述组成载波对应的带宽资源用于所述用户设备在该组成载波上发送随 机接入前导码；
接收所述用户设备在所述组成载波对应的带宽资源上发送的随机接入前 导码， 向所述用户设备发送定时提前命令， 以将所述组成载波的定时提前值通 知给所述用户设备。
本发明实施例还提供一种上行同步方法， 包括：
在第一组成载波上向基站发送随机接入前导码；
在接收竟争解决消息或无线资源控制协议连接重建立消息的同时获取上 行带宽分配信息，根据所述上行带宽分配信息的指示确定需要用户设备执行同 步的组成载波及所述组成载波对应的带宽资源，所述组成载波对应的带宽资源 用于所述用户设备在该组成载波上发送随机接入前导码；
在所述组成载波对应的带宽资源上向基站发送随机接入前导码； 接收来自基站的定时提前命令，根据所述定时提前命令的指示得到所述组 成载波的定时提前值。
本发明实施例还提供一种基站， 包括：
信息分配单元，用于接收用户设备在第一组成载波上发送的随机接入前导 码，在发送竟争解决消息或无线资源控制协议连接重建立消息的同时向用户设 备发送上行带宽分配信息，以指示需要用户设备执行同步的组成载波及所述组 成载波对应的带宽资源，所述组成载波对应的带宽资源用于所述用户设备在该 组成载波上发送随机接入前导码；
定时指示单元，用于接收所述用户设备在所述组成载波对应的带宽资源上 发送的随机接入前导码， 向所述用户设备发送定时提前命令， 以将所述组成载 波的定时提前值通知给所述用户设备。
本发明实施例还提供一种用户设备， 包括：
第一发送单元， 用于在第一组成载波上向基站发送随机接入前导码； 信息获取单元，用于在接收竟争解决消息或无线资源控制协议连接重建立 消息的同时获取上行带宽分配信息，根据所述上行带宽分配信息的指示确定需 要用户设备执行同步的组成载波及所述组成载波对应的带宽资源，所述组成载 波对应的带宽资源用于所述用户设备在该组成载波上发送随机接入前导码； 第二发送单元，用于在所述组成载波对应的带宽资源上向基站发送随机接 入前导码；
定时接收单元， 用于接收来自基站的定时提前命令，根据所述定时提前命 令的指示得到所述组成载波的定时提前值。
由上述方案可知，本发明实施例接收用户设备在第一组成载波上发送的随 机接入前导码，在发送竟争解决消息或无线资源控制协议连接重建立消息的同 时发送上行带宽分配信息，将用户设备需要执行同步的组成载波及对应资源通 知用户设备，使得用户设备能利用所述资源发送随机接入前导码， 并获取需要 同步的组成载波的定时提前值， 以在需要同步的组成载波上实现同步， 无需用 户设备针对每个组成载波逐个执行随机接入过程，可在尽量节约随机接入资源 的情况下减小用户设备的上行同步时延。
附图说明
图 1为本发明实施例提供的一种上行同步方法的示意图；
图 2为本发明实施例提供的又一种上行同步方法的示意图；
图 3为本发明实施例提供的又一种上行同步方法的示意图；
图 4a为本发明实施例提供的一种上行带宽分配消息的内容的示意图； 图 4b为本发明实施例提供的又一种上行带宽分配消息的内容的示意图； 图 5为本发明实施例提供的又一种上行同步方法的示意图；
图 6为本发明实施例提供的又一种上行同步方法的示意图；
图 7为本发明实施例提供的一种基站设备的示意图；
图 8为本发明实施例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 1为本发明实施例提供的一种上行同步方法的示意图， 所述方法包括：
S11 : 接收用户设备在第一组成载波上发送的随机接入前导码， 在发送竟 争解决消息或无线资源控制协议连接重建立消息的同时向用户设备发送上行 带宽分配信息，以指示需要用户设备执行同步的组成载波及所述组成载波对应 的带宽资源，所述组成载波对应的带宽资源用于所述用户设备在该组成载波上 发送随机接入前导码；
S12: 接收所述用户设备在所述组成载波对应的带宽资源上发送的随机接 入前导码， 向所述用户设备发送定时提前命令， 以将所述组成载波的定时提前 值通知给所述用户设备。
本实施例中， 基站接收用户设备在第一组成载波上发送的随机接入前导 码，在发送竟争解决消息或无线资源控制协议连接重建立消息的同时向用户设 备发送上行带宽分配信息，以指示需要用户设备执行同步的组成载波及对应的 带宽资源，使得用户设备能够在所述带宽资源上发送的随机接入前导码， 当接 收到用户设备发来的随机接入前导码之后，可发送定时提前命令使得用户设备 能够获得需要同步的组成载波的定时提前值，有利于用户设备在所述需要同步 组成载波上执行上行同步。所述需要用户设备执行同步的组成载波可以有一个 或多个。本实施例尤其适用于用户设备需要执行接入的多个组成载波的定时提 前值不同的场景，本实施例的第一组成载波是用户设备向基站设备初始进行随 机接入时的某一组成载波， 可以是用户设备的主组成载波（Anchor CC ), 所述 主组成载波可以是用户设备在服务 eNB发生掉链前的主组成载波（这个主组 成载波可以看作一个特定的小区， 或称之为服务小区）， 或者是用户设备在切 换到目标基站时切换命令中指示的主组成载波（这个主组成载波可以看作一个 特定的小区， 或称之为服务小区）。 用户设备发生掉链或切换到当前基站时， 需要执行随机接入， 可利用所述第一组成载波发送前导码。 当用户设备多个组 成载波的定时提前值不同时， 如果在与第一组成载波的 TA值不同的其它组成 载波上单独执行接入过程，将增大用户设备同步的时延并消耗更多的随机接入 资源， 此时基站可将需要 UE进行同步的组成载波及对应带宽资源通知 UE, 以使 UE利用相应带宽资源在这些组成载波上发送前导码， 并接收 UE在所述 资源上发送的前导码，以便根据每个组成载波的相关前导码计算出该组成载波 对应的定时提前值， 并通过定时提前命令将计算出的定时提前值通知用户设 备，便于用户设备根据每个定时提前值执行对应组成载波的定时调整， 无需用 户设备针对每个组成载波逐个执行随机接入过程，可在尽量节约随机接入资源 的情况下减小用户设备上行同步的时延。所述需要用户执行同步的组成载波可 以有多个， 可以是用户设备多个组成载波中与第一组成载波 TA值不同的其它 组成载波。可以理解， 需要用户执行同步的组成载波也可以是基站为用户设备 新分配的组成载波，此时需要用户设备在新分配的组成载波上执行后续同步过 程， 相当于是进行了用户设备组成载波的更换。
在一种具体应用中，所述上行带宽分配信息中可包括至少 1个组成载波的 标识符以及与该组成载波对应的带宽资源。但在一些应用场景下， 需要用户设 备执行同步的组成载波可能有多个，在多个组成载波中可能存在一些载波拥有 相同的定时提前值， 或者说可以共享同样的定时提前值， 当一些组成载波的定 时提前值可以共享， 即相同时， 则无需将这些载波的相关信息都包括在上行带 宽分配信息中， 此时可采用如下的实现方式： 所述各组成载波被划分为多个组 成载波组，在每个组成载波组内的所有组成载波的定时提前值相等， 此时所述 上行带宽分配信息中包括至少 1 个组成载波组内代表性组成载波的标识符以 及与该代表性组成载波对应的带宽资源。所述组成载波组是按照组成载波的定 时提前值划分的， 同样的组成载波组内的组成载波可以共享同一个定时提前 值， 即同一个组成载波组内的组成载波的定时提前值相等， 这样可选择本组成 载波组内 1 个载波的定时提前值代表组成载波组内所有组成载波的定时提前 值， 所选择的组成载波也就是代表性组成载波。 可以理解， 如果一个组成载波 的定时提前值与其它组成载波均不同， 其自身也可构成一个组，也就是说每个 组成载波组内的组成载波数量不是固定的， 可以是任意正整数。通过所述分组 方案， 可用一个代表性组成载波代替本组成载波组内其它组成载波， 只通过一 个组成载波在上行带宽分配信息中指示出组成载波组内所有组成载波对应的 带宽资源， 筒化了上行带宽分配信息。
在一种具体应用中， 所述向用户设备发送上行带宽分配信息可包括： 将所 述上行带宽分配信息携带在竟争解决消息或无线资源控制协议连接重建立消 息内发送给所述用户设备。 通过将上行带宽分配信息携带在其它消息中发送， 无需发送单独的上行带宽分配信息， 可节省额外的信令开销。
再进一步地， 所述方法还可包括当需要用户设备执行主组成载波（该主组 成载波可以看作一个特定的小区， 称之为服务小区）变更时， 利用竟争解决消 息、无线资源控制协议连接重建立消息、或自定义消息指示用户设备切换到新 的主组成载波或者服务小区。 这里， 所谓的主组成载波或者服务小区的特征在 于， 其为用户设备提供用于产生加密和完整性保护密钥的输入参数。 由于用户 设备发送的第一组成载波可以是用户设备的原主组成载波，如果原主组成载波 或服务小区是其自己选择的，基站可对用户设备的选择进行更改， 即指示用户 设备变更服务小区或主组成载波。况且用户设备需要执行同步的组成载波可以 是为用户设备新分配的载波，新分配的载波的相应服务小区可能与用户设备之 前的服务小区不同， 因此在通知用户设备所需要执行同步的组成载波时，也需 要通知用户设备切换到新的相应小区上。此处的原主组成载波是相对于需要变 更的组成载波而言的， 其名称并不对其实质构成限定。
图 2 为本发明实施例提供的又一种上行同步方法的示意图， 所述方法包 括：
S21 : 在第一组成载波上向基站发送随机接入前导码；
S22: 在接收竟争解决消息或无线资源控制协议连接重建立消息的同时获 取上行带宽分配信息，根据所述上行带宽分配信息的指示确定需要用户设备执 行同步的组成载波及所述组成载波对应的带宽资源，所述组成载波对应的带宽 资源用于所述用户设备在该组成载波上发送随机接入前导码；
S23： 在所述组成载波对应的带宽资源上向基站发送随机接入前导码； S24: 接收来自基站的定时提前命令， 根据所述定时提前命令的指示得到 所述组成载波的定时提前值。
本实施例中， 用户设备在第一组成载波上向基站发送随机接入前导码，接 收上行带宽分配信息、 利用所述信息的指示在相应资源上发送随机接入前导 码，从而使用户设备能获取来自基站的定时提前命令，从而得到其需要执行同 步的组成载波的定时提前值，从而有利于用户设备根据每个定时提前值执行对 应载波的定时调整，本实施例尤其适用于用户设备需要执行同步的多个组成载 波的定时提前值不同的场景，这样无需用户设备针对每个组成载波逐个执行随 机接入过程， 可在尽量节约随机接入资源的情况下减小用户设备上行同步时 延。
在一种具体实现中， 所述获取上行带宽分配信息可包括： 接收竟争解决消 息或无线资源控制协议连接重建立消息，获取携带在所述竟争解决消息或无线 资源控制协议连接重建立消息内的上行带宽分配信息。此处基站可将上行带宽 分配信息携带在其它消息中发送， 无需发送单独的上行带宽分配信息， 可节省 额外的信令开销。
在一种具体应用中，所述根据所述上行带宽分配信息的指示确定需要用户 设备执行同步的组成载波及所述组成载波对应的带宽资源可包括：根据所述上 行带宽分配信息中包括的至少 1个组成载波的标识符，确定与该组成载波的标 识符对应的带宽资源作为该组成载波对应的带宽资源。 但在一些应用场景下， 在多个组成载波中可能存在一些载波可以共享相同的定时提前值，当一些载波 的定时提前值相同时，则无需将这些载波的相关信息都包括在上行带宽分配信 息中， 此时可采用如下的实现方式： 根据所述上行带宽分配信息中包括的至少 1个组成载波组内代表性组成载波的标识符， 确定与该代表性组成载波的标识 符对应的带宽资源作为该组成载波组内组成载波对应的带宽资源，所述组成载 波组内所有组成载波的定时提前值相等。 上述方法使用某个组成载波组内 1 个载波的定时提前值代表该组成载波组内所有组成载波的定时提前值，用户设 备仅通过获取 1 个载波的定时提前值就能掌握组成载波组内所述载波的定时 提前值。 可以理解， 每个组成载波组内的组成载波数量不是固定的， 可以是任 意正整数。
进一步地，所述在组成载波对应的带宽资源上发送的随机接入前导码与所 述在第一组成载波上发送的随机接入前导码是同一前导码。如果在需要执行同 步的载波上发送的前导码与首次在第一组成载波上发送的前导码相同，则可避 免基站对该前导码进行盲检测。当然此处用户设备在各组成载波对应的带宽资 源上发送的随机接入前导码也可以是用户设备随机选择的，如果前导码是用户 设备随机选择的， 则需要基站针对随机接入前导码执行盲检测过程， 这样只是 轻 增加了 eNB的检测复杂性， 不影响实施效果， 本实施例对此不作限定。
进一步地， 所述方法还可包括： 根据竟争解决消息、 无线资源控制协议连 接重建立消息、或自定义消息的指示切换到新的主组成载波或者服务小区（所 述主组成载波或者服务小区特征同前）， 并将新的主组成载波或者服务小区的 物理层小区标示符（ PCI )、频率等其他参数作为生成加密及完整性保护安全密 钥的输入参数。用户设备在掉链后通常会进行连接重建立时， 用户设备可选择 其掉链前的原主组成载波或者服务小区作为第一组成载波，在该载波上发送前 导码，如果用户设备原主组成载波或服务小区是其自己选择的，基站可对用户 设备的选择进行更改， 即指示用户设备变更服务小区或主组成载波。 况且用户 设备需要执行同步的组成载波可以是为用户设备新分配的载波，新分配的载波 的相应服务小区可能与用户设备之前的服务小区不同，因此在通知用户设备所 需要执行同步的组成载波时，也需要通知用户设备切换到新的相应小区上， 此 时用户设备可以根据竟争解决消息、无线资源控制协议连接重建立消息、或自 定义消息的指示完成这样的切换，并根据所述指示将新的服务小区或者主组成 载波的物理层小区标示符（ PCI )、频率等参数作为生成加密及完整性保护安全 密钥的输入参数，使得后续连接重建立过程不受服务小区或者主组成载波切换 的影响。
需要说明的是， 本实施例尤其适用于用户设备在不同网络设备（如基站） 间切换、 以及用户设备在原有多个组成载波上都发生失步（即用户设备与网络 设备间出现掉链）的场景。切换目标基站或与用户设备重新建立连接的基站可 通过发送上行带宽分配信息， 指示用户设备需要执行上行同步的载波是哪些、 以及这些载波对应的带宽资源，使得用户设备能按照本发明方法实施例的过程 在需要执行同步的载波上完成上行同步过程。本发明实施例的后续部分将分别 针对几个不同的应用场景对相应的上行同步过程进行具体说明。
图 3 为本发明实施例提供的又一种上行同步方法的示意图， 所述方法包 括：
S31: UE将随机接入前导码（Preamble )发送给服务 eNB。
在一种具体应用中， 当 UE检测到其正在使用的多个 CC均发生失步时， 则 判定所述 UE与其服务 eNB之间发生掉链， 所述 UE可执行与所述服务 eNB之间 的 RRC ( Radio Resource Control, 无线资源控制协议）连接重建立过程。 所述 重建立过程可首先通过由 UE发送前导码开始， UE可以在服务小区 （或者叫主 CC )上选择所述前导码。 例如， 对于 TDD ( Time Division Duplex, 时分双工） 模式， UE可以从掉链前被选择作为服务小区的 CC (也叫主 CC )上随机选择一 个 preamble发送给 eNB; 对于 FDD ( Frequency Division Duplex, 频分双工）模 式， UE可以从掉链之前被选择作为服务小区的那个 CC对（ Component carrier pair ) (也叫主 CC, 其含义参加之前实施例的描述） 的下行 CC上随机选择一 个 preamble并通过相应的上行 CC发送给 eNB。 当然， UE也可以从掉链之前的 多个 CC/CC对中任意选择一个 CC/CC对， 然后在所选 CC/CC对上随机选择一个 preamble发送给所述 eNB。 后续不再对 TDD模式和 FDD模式进行分别说明， 在 本发明实施例中， 如无特殊描述， 所提到 CC既可指 TDD模式下的 CC, 也可指 FDD模式下的 CC对。
另外， 需要特别说明的是， 本发明实施例中提及的服务小区或者主 CC, 是具有如下特征的 CC, 即： UE将该服务小区或者主 CC的物理层小区标示符 PCI、 频率等参数作为生成加密和完整性保护密钥的输入参数。 因此， 这里的 服务小区和主 CC仅仅是对所有的组成载波中的特定的组成载波的一个称呼， 并没有额外的限定。
S32: 服务 eNB向 UE发送随机接入响应消息。
S33: UE在收到随机接入响应消息后， 向所述服务 eNB发送 RRC连接重建 立请求消息。 具体地， 在所述 RRC连接重建立请求消息中可包含 UE的 C-RNTI ( Cell Radio Network Temporary Identifier,小区无线网络临时标识）标识符。
S34: 服务 eNB接收到 UE发送的 RRC连接重建立请求消息后， 基于 UE的 C-RNTI标识符获知该 UE之前使用的多个 CC都已经发生上行失步。
S35: 当所述 UE之前使用的多个 CC不具有同样的 TA值， 服务 eNB向 UE发 送竟争解决消息（ Contention resolution ) , 并在该竟争解决消息中携带上行带 宽分配消息。 样的 ΤΑ值。 如果这些 CC不具有的同样的 ΤΑ值， 则 eNB可在需要 UE执行上行 同步的多个 CC上为 UE分配的发送随机接入 preamble的带宽资源。 本过程中的 上行带宽分配消息用于指示 eNB在需要 UE执行上行同步的多个 CC上为 UE分 配的发送随机接入 preamble的带宽资源； 所述竟争解决消息为一 RACH ( Random Access Channel, 随机接入信道） 消息 4。 eNB可将上行带宽分配消 息的内容作为竟争解决消息的一个字段携带在竟争解决消息中发送给 UE , 也 就是说，竟争解决消息中包含了 eNB在需要 UE执行上行同步的多个 CC上为 UE 分配的发送随机接入 preamble的带宽资源。 所述需要 UE执行上行同步的多个 CC可以与 UE掉链之前使用的多个 CC完全相同； 当然， eNB也可以为 UE重新 配置其他的 CC作为所述需要 UE执行上行同步的多个 CC。 在本过程中， eNB可 以在上行带宽分配消息中包含分配给 UE的各个需要执行上行同步的 CC的标 识符以及与这些 CC对应的发送 preamble的上行时频资源信息 （又叫 UL带宽信 息）。 图 4a为本发明实施例提供的一种上行带宽分配消息的内容的示意图。 所 述内容包括 UE执行上行同步的多个 CC的标识信息。 在此图 4a中显示了从 CC1 到 CCn共 n个 CC的标识， 其中每个 CC都有与之相对应的发送 preamble的上行 ( UL, Uplink )资源。 上述过程将上行带宽分配消息携带在竟争解决消息中发 送，但在实际应用中，也可将上行带宽分配消息作为一个独立的消息进行发送， 独立的上行带宽分配消息与竟争解决消息在发送时彼此之间可没有严格的先 后顺序， 本实施例对此不作限定。
在一种具体应用中，可以将上行带宽分配消息中指示的多个 CC进行分组， 即将 UE执行上行同步的多个 CC按照是否可以共享一个 TA进行分组，并将该分 组信息通过广播或者专用信令发送给 UE。 在这种情况下， eNB仅需在每个组 中选择一个代表性的 CC及其对应的发送 preamble的上行资源通知给 UE, UE在 该代表性的 CC上执行上行同步后得到该代表性的 CC的 TA值， 该得到的 TA值 也就是与该代表性的 CC同属于一个 CC组的其他 CC的 TA值。 上行带宽分配消 息中的包含的信息可以是： 需要执行上行同步的多个 CC中的各个代表性的 CC 的标识符以及在这些代表性的 CC上分配给 UE的用于发送随机接入 preamble的 上行时频资源信息。 可以理解， 所述代表性的 CC可以由 eNB从 CC组中分配给 UE的多个 CC中任意指定。 图 4b为本发明实施例提供的又一种上行带宽分配消 息的内容的示意图。 在图 4b中， 存在从 CC1到 CCn共 n个代表性 CC的标识， 与 图 4a不同， 每个代表性 CC可代表一组 CC, 一个组成载波组内的全部 CC的 TA 值是相同的， 此时， 仅需在代表性的 CC上分配发送 preamble的带宽资源即可。
所述竟争解决消息和上行带宽分配消息可以通过多种形式发送。在一种具 体应用中， 所述消息的形式可首选为 MAC ( Media Access Control, 媒体接入 控制）控制 PDU ( Protocol Data Unit, 协议数据单元） ， 此外也可以是 RRC消 息或者物理层消息， 此处不作为限定。
S36: 所述服务 eNB向 UE发送 RRC连接重建立消息。 S37： UE在所述上行带宽分配消息中指示的带宽资源上向服务 eNB发送 preamble。
UE在接收到 eNB发送的竟争解决消息和上行带宽分配消息后能够获知上 行带宽分配消息中指示的带宽资源， UE可随机选择一个 preamble在所述带宽资 源上发送给服务 eNB; 在另一种实现方式中， UE也可将过程 S31中发送的随机 接入 preamble在所述带宽资源上发送给 eNB。 如果限定 UE采用过程 S31中发送 的同一 preamble作为本次发送的 preamble ,则可以降低 eNB盲检测 preamble的复 杂性。
S38: UE向所述 eNB发送 RRC连接重建立完成消息。
S39: 所述服务 eNB向 UE发送 TA调整命令。 具体地， eNB向 UE发送的 TA 调整命令中可包含需要上行同步的多个 CC所需要调整的 TA值。
需要说明的是， 过程 S36、 S37、 S38和 S39之间没有严格的顺序关系， 本 领域技术人员可以根据实际应用对本实施例的流程进行适应性调整。
在 S31中，服务 eNB可以在 UE执行 RRC连接重建立的时候对 UE掉链 时的服务小区 /主 CC进行更改。 UE在执行 RRC连接重建立的时候， 可以自 行选择服务小区 /主 CC,如果服务小区 /主 CC是由 UE自行选择的，服务 eNB 也可对 UE的选择的服务小区 /主 CC进行更改， 在这些情况下， 服务 eNB可 以在发送竟争解决消息或者 RRC连接重建立消息时，在所述消息中增加服务 小区 （Serving Cell ) /主 CC改变指示， 指示 UE应该将原服务小区替换为所 指示的新的服务小区， 也就是说， 此时服务 eNB 需要在竟争解决消息或者 RRC连接重建立消息中将 eNB为 UE重新选择的服务小区 /主 CC的标识信息 通知 UE。 或者， eNB也可以用单独的自定义消息通知 UE改变服务小区 /主 CC, 该单独的消息可以称之为服务小区 /主 CC改变消息。 相应地， 当 UE接 收到竟争解决消息或者 RRC连接重建立消息时，或者当 UE接收到服务小区 /主 CC改变消息时， UE可使用这些消息中指示的新的服务小区 /主 CC的参 数， 所述参数可包括新服务小区 /主 CC的 PCI (物理层小区标识 )或频率等， 这些参数可作为生成加密及完整性保护安全密钥的输入参数， 使得后续的
RRC 连接建立以及 RRC连接建立完成过程不受服务小区变更的影响。
上述实施例针对的是载波汇聚场景下 UE发生掉链的场景， 当 UE检测到 其正在使用的多个 CC均发生失步时， 可向 eNB发送 preamble以进行连接重 建立， eNB在 UE需要执行同步的 CC上为 UE分配资源， 使得 UE在相应资 源上发送 preamble以执行同步过程，无需 UE针对每个 CC逐个执行随机接入 过程， 可在尽量节约资源的情况下减小 UE上行同步的时延。 在本实施例中， 上行带宽分配消息被携带在竟争解决消息中发送，无需发送单独的上行带宽分 配消息， 可节约部分资源。 可以理解， UE需要执行同步的 CC与 UE发生掉 链之前使用的原 CC可以相同或者不同。
图 5 为本发明实施例提供的又一种上行同步方法的示意图， 所述方法包 括：
S51 : UE将随机接入 Preamble发送给服务 eNB。 具体地， UE可在检测到其 正在使用的多个 CC均发生失步时， 向其服务 eNB发送一 Preamble 以发起 RRC 连接重建立过程。
S52: 服务 eNB向 UE发送随机接入响应消息。
S53: UE向所述服务 eNB发送 RRC连接重建立请求消息。 在所述 RRC连接 重建立请求消息中包含 UE的 C-RNTI标识符。
S54: 服务 eNB向 UE发送竟争解决消息。
S55: 服务 eNB根据之前 UE发送的 RRC连接重建立请求消息中包含的 UE 的 C-RNTI标识符能够获知该 UE之前使用的多个 CC都已经发生上行失步。
S56: 所述服务 eNB向 UE发送 RRC连接重建立消息， 在所述 RRC连接重建 立消息内携带上行带宽分配消息。 值， 如果这些 CC不具有的同样的 TA值， 则 eNB可在 UE需要执行上行同步的多 个 CC上为 UE分配的发送随机接入 preamble的带宽资源， 并采用上行带宽分配 信息指示所述在需要 UE执行上行同步的多个 CC上为 UE分配的发送随机接入 preamble的带宽资源。 在本过程中， eNB可将上行带宽分配消息所包含的内容 作为 RRC连接重建立消息的一个字段发送，也就是说， RRC连接重建立消息中 可包含在 UE执行上行同步的多个 CC上为 UE分配的发送随机接入 preamble的 带宽资源。所述需要 UE执行上行同步的多个 CC可以与 UE掉链之前使用的多个 CC相同或不同。 与之前的实施例相类似， eNB可以在上行带宽分配消息中包 含分配给 UE的各个需要执行上行同步的 CC的标识符以及与这些 CC对应的发 送 preamble的上行时频资源信息； 在一种具体应用中， 可以将上行带宽分配消 息中指示的多个 CC进行分组，即将需要 UE执行上行同步的多个 CC按照是否可 以共享一个 TA进行分组， 并将该分组信息通过广播或者专用信令发送给 UE, 对于之前实施例已经介绍的内容，此处不做重复描述。可以理解，在本过程中， 可以将上行带宽分配消息作为一个独立的消息进行发送， 而不是携带在 RRC 连接重建立消息中。独立的上行带宽分配消息与 RRC连接重建立消息间可没有 严格的发送顺序。
S57: UE在所述上行带宽分配消息中指示的带宽资源上向服务 eNB发送 preamble 所述 preamble可由 UE随机选择；或者，可将过程 S51中发送的 preamble 作为本次发送的 preamble , 以降低 eNB盲检测 preamble时的复杂性。
S58: UE向所述 eNB发送 RRC连接重建立完成消息。
S59: 所述服务 eNB向 UE发送 TA调整命令。 具体地， eNB向 UE发送的 TA 调整命令中可包含需要上行同步的多个 CC所需要调整的 TA值。
需要说明的是， 过程 S57、 S58和 S59之间没有严格的顺序关系。 并且与之 前实施例相类似，本实施例中服务 eNB可以在发送竟争解决消息或者 RRC连接 重建立消息时， 在所述消息中增加服务小区 （Serving Cell ) /主 CC改变指示， 指示 UE应该将原服务小区 /主 CC替换为所指示的新的服务小区 /主 CC, 本实施 例对此不再赘述。
上述实施例针对的是载波汇聚场景下 UE发生掉链的场景，所述上行带宽 分配消息被携带在 RRC连接重建立消息中发送， 无需发送单独的上行带宽分 配消息， 可节约部分资源。
需要说明的是，在上述图 3和图 5中所述的实施中， 上行带宽分配消息是 携带在过程 S35的竟争解决消息或者携带在 S56的 RRC连接重建立消息中一 起发送的。或者，上行带宽分配消息可作为独立的消息与竟争解决消息或 RRC 连接重建立消息并行一起发送给 UE的，这里所述并行发送也就是在同一时间 发送。 除此以外， 上行带宽分配消息也可以作为单独的消息在发送竟争解决消 息和 RRC连接重建立消息这两个过程之间的任意时刻发送， 本实施例对此不 进行限定。
图 6 为本发明实施例提供的又一种上行同步方法的示意图， 所述方法包 括：
S61: UE接收来自源 eNB的切换命令消息或带有移动性管理字段的 RRC连 接重配置消息。
S62： UE将随机接入 Preamble发送给目标 eNB。
S63: 目标 eNB向 UE发送随机接入响应消息。
S64: UE向所述目标 eNB发送切换完成消息或 RRC连接重配置完成消息。 所述切换完成消息或 RRC连接重配置完成消息中可包含所述 UE的 C-RNTI标 识符。
S65: 目标 eNB收到所述切换完成消息或 RRC连接重配置完成消息后， 根 据所述切换完成消息或 RRC连接重建立完成消息中的指示确定所述 UE之前使 用的多个 CC不具有的同样的 TA值， 则目标 eNB向 UE发送竟争解决消息， 并在 所述竟争解决消息内携带上行带宽分配消息。具体的竟争解决消息发送过程可 参照之前的实施例， 此处不做赘述。 可以理解， 上行带宽分配消息可在所述竟 争解决消息之外单独发送。
S66: UE在所述上行带宽分配消息中指示的带宽资源上向目标 eNB发送 preamble 所述 preamble可由 UE随机选择；或者，可将过程 S62中发送的 preamble 作为本次发送的 preamble, 以降低目标 eNB盲检测 preamble时的复杂性。
S67: 所述目标 eNB向 UE发送 TA调整命令。 具体地， 目标 eNB向 UE发送 的 TA调整命令中可包含需要上行同步的多个 CC所需要调整的 TA值。
需要说明的是， 过程 S66和 S67之间同样没有严格的顺序关系。
上述实施例针对的是载波汇聚场景下 UE发生切换的场景， 当 UE需要切 换并向目标 eNB发送 preamble以进行连接重配置， 目标 eNB在 UE需要执行 同步的 CC上为 UE分配资源， 使得 UE在相应资源上发送 preamble以于目标 eNB完成同步过程， ， 无需 UE针对每个 CC逐个执行随机接入过程， 可在尽 量节约资源的情况下减小 UE上行同步的时延。
图 7为本发明实施例提供的一种基站设备的示意图， 所述基站包括： 信息分配单元 71 , 用于接收用户设备在第一组成载波上发送的随机接入 前导码，在发送竟争解决消息或无线资源控制协议连接重建立消息的同时向用 户设备发送上行带宽分配信息，以指示需要用户设备执行同步的组成载波及所 述组成载波对应的带宽资源，所述组成载波对应的带宽资源用于所述用户设备 在该组成载波上发送随机接入前导码；
定时指示单元 72, 用于接收所述用户设备在所述组成载波对应的带宽资 源上发送的随机接入前导码， 向所述用户设备发送定时提前命令， 以将所述组 成载波的定时提前值通知给所述用户设备。
所述基站设备可指示用户设备需要执行同步的 CC及相应资源，使用户设 备能发起后续同步过程，无需用户设备针对每个组成载波逐个执行随机接入过 程， 可在尽量节约资源的情况下减小用户设备上行同步的时延。 进一步地， 所述信息分配单元 71可包括： 携带发送模块， 用于将所述上 行带宽分配信息携带在竟争解决消息或无线资源控制协议连接重建立消息内 发送给所述用户设备。通过所述携带发送过程， 无需单独信令发送上行带宽分 配信息， 可节约部分信令开销。
进一步地， 所述基站还可包括： 切换通知单元； 当需要用户设备执行服务 小区 /主 CC变更时，所述切换通知单元用于利用竟争解决消息、无线资源控制 协议连接重建立消息、 或自定义消息指示用户设备切换到新的服务小区 /主 cc。
图 8为本发明实施例提供的一种用户设备的示意图， 所述用户设备包括： 第一发送单元 81 , 用于在第一组成载波上向基站发送随机接入前导码； 信息获取单元 82, 用于在接收竟争解决消息或无线资源控制协议连接重 建立消息的同时获取上行带宽分配信息，根据所述上行带宽分配信息的指示确 定需要用户设备执行同步的组成载波及所述组成载波对应的带宽资源，所述组 成载波对应的带宽资源用于所述用户设备在该组成载波上发送随机接入前导 码；
第二发送单元 83 , 用于在所述组成载波对应的带宽资源上向基站发送随 机接入前导码；
定时接收单元 84, 用于接收来自基站的定时提前命令， 根据所述定时提 前命令的指示得到所述组成载波的定时提前值。
所述用户设备在其多个组成载波均发生失步或需要执行切换时，可通过获 取上行带宽分配信息在需要执行同步的 CC上展开同步， 无需针对每个 CC执 行独立的上行同步流程，在尽量节约资源的情况下减小用户设备上行同步的时 延。
进一步地， 所述信息获取单元 82可包括： 信息接收模块， 用于接收竟争 解决消息或无线资源控制协议连接重建立消息，获取携带在所述竟争解决消息 或无线资源控制协议连接重建立消息内的上行带宽分配信息。
更进一步地， 所述信息获取单元 82还可包括： 第一资源确定模块， 用于 根据所述上行带宽分配信息中包括的至少 1个组成载波的标识符，确定与该组 成载波的标识符对应的带宽资源作为该组成载波对应的带宽资源。 或者， 所述 信息获取单元 82还可包括： 第二资源确定模块， 用于根据所述上行带宽分配 信息中包括的至少 1个组成载波组内代表性组成载波的标识符，确定与该代表 性组成载波的标识符对应的带宽资源作为该组成载波组内组成载波对应的带 宽资源， 所述组成载波组内所有组成载波的定时提前值相等。
再进一步地， 所述第二发送单元 83可包括： 选择发送模块， 用于选择所 述第一接收单元在第一组成载波上发送的随机接入前导码作为在所述组成载 波对应的带宽资源上发送的随机接入前导码。如果在需要用户设备同步的载波 上发送的前导码与在第一组成载波上发送的前导码相同，能避免基站对用户设 备发送的前导码进行盲检测。
更进一步地， 所述用户设备还可包括： 变更执行单元， 用于根据接收到的 竟争解决消息、无线资源控制协议连接重建立消息、或自定义消息的指示切换 到新的服务小区 /主 CC, 并将新的服务小区 /主 CC的物理层小区标示符、频率 等参数作为生成加密及完整性保护安全密钥的输入参数。
可以理解，本发明实施例提供的基站与用户设备可执行之前方法实施例中 的流程， 达到在尽量节约资源的情况下减小用户设备上行同步时延的效果。
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 ) 或随机存者己忆体 ( 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。

Claims

权 利 要 求
1、 一种上行同步方法， 其特征在于， 包括：
接收用户设备在第一组成载波上发送的随机接入前导码，在发送竟争解决 消息或无线资源控制协议连接重建立消息的同时向用户设备发送上行带宽分 配信息，以指示需要用户设备执行同步的组成载波及所述组成载波对应的带宽 资源，所述组成载波对应的带宽资源用于所述用户设备在该组成载波上发送随 机接入前导码；
接收所述用户设备在所述组成载波对应的带宽资源上发送的随机接入前 导码， 向所述用户设备发送定时提前命令， 以将所述组成载波的定时提前值通 知给所述用户设备。
2、 根据权利要求 1所述的方法， 其特征在于，
所述上行带宽分配信息中包括：至少 1个组成载波的标识符以及与该组成 载波对应的带宽资源； 或者
所述上行带宽分配信息中包括：至少 1个组成载波组内代表性组成载波的 标识符以及与该代表性组成载波对应的带宽资源，所述组成载波组内的所有组 成载波的定时提前值相等。
3、 根据权利要求 1所述的方法， 其特征在于， 所述在发送竟争解决消息 或无线资源控制协议连接重建立消息的同时向用户设备发送上行带宽分配信 息可包括：将所述上行带宽分配信息携带在所述竟争解决消息或无线资源控制 协议连接重建立消息内发送给所述用户设备。
4、 根据权利要求 1 - 3中任一项所述的方法， 其特征在于， 当需要用户设 备执行服务小区 /主组成载波变更时， 利用竟争解决消息、 无线资源控制协议 连接重建立消息、 或自定义消息指示用户设备执行服务小区 /主组成载波的更 新。
5、 一种上行同步方法， 其特征在于， 包括： 在第一组成载波上向基站发送随机接入前导码；
在接收竟争解决消息或无线资源控制协议连接重建立消息的同时获取上 行带宽分配信息，根据所述上行带宽分配信息的指示确定需要用户设备执行同 步的组成载波及所述组成载波对应的带宽资源；
在所述组成载波对应的带宽资源上向基站发送随机接入前导码； 接收来自基站的定时提前命令，根据所述定时提前命令的指示得到所述组 成载波的定时提前值。
6、 根据权利要求 5所述的方法， 其特征在于， 所述在接收竟争解决消息 或无线资源控制协议连接重建立消息的同时获取上行带宽分配信息可包括：接 收竟争解决消息或无线资源控制协议连接重建立消息，获取携带在所述竟争解 决消息或无线资源控制协议连接重建立消息内的上行带宽分配信息。
7、 根据权利要求 5所述的方法， 其特征在于， 所述根据所述上行带宽分 配信息的指示确定需要用户设备执行同步的组成载波及所述组成载波对应的 带宽资源包括：
根据所述上行带宽分配信息中包括的至少 1个组成载波的标识符，确定与 该组成载波的标识符对应的带宽资源作为该组成载波对应的带宽资源； 或者 根据所述上行带宽分配信息中包括的至少 1 个组成载波组内代表性组成 载波的标识符，确定与该代表性组成载波的标识符对应的带宽资源作为该组成 载波组内组成载波对应的带宽资源，所述组成载波组内所有组成载波的定时提 前值相等。
8、 根据权利要求 5所述的方法， 其特征在于， 所述在组成载波对应的带 宽资源上发送的随机接入前导码与所述在第一组成载波上发送的随机接入前 导码是同一前导码。
9、 根据权利要求 5 - 8中任一项所述的方法， 其特征在于， 还包括： 根据接收到的竟争解决消息、无线资源控制协议连接重建立消息、或自定 义消息的指示执行服务小区 /主组成载波的更新， 并将新的服务小区 /主组成载 波的物理层小区标示符、频率等参数作为生成加密及完整性保护安全密钥的输 入参数。
10、 一种基站， 其特征在于， 包括：
信息分配单元，用于接收用户设备在第一组成载波上发送的随机接入前导 码，在发送竟争解决消息或无线资源控制协议连接重建立消息的同时向用户设 备发送上行带宽分配信息，以指示需要用户设备执行同步的组成载波及所述组 成载波对应的带宽资源，所述组成载波对应的带宽资源用于所述用户设备在该 组成载波上发送随机接入前导码；
定时指示单元，用于接收所述用户设备在所述组成载波对应的带宽资源上 发送的随机接入前导码， 向所述用户设备发送定时提前命令， 以将所述组成载 波的定时提前值通知给所述用户设备。
11、 根据权利要求 10所述的基站， 其特征在于， 所述信息分配单元包括： 携带发送模块，用于将所述上行带宽分配信息携带在竟争解决消息或无线资源 控制协议连接重建立消息内发送给所述用户设备。
12、 一种用户设备， 其特征在于， 包括：
第一发送单元， 用于在第一组成载波上向基站发送随机接入前导码； 信息获取单元，用于在接收竟争解决消息或无线资源控制协议连接重建立 消息的同时获取上行带宽分配信息，根据所述上行带宽分配信息的指示确定需 要用户设备执行同步的组成载波及所述组成载波对应的带宽资源，所述组成载 波对应的带宽资源用于所述用户设备在该组成载波上发送随机接入前导码； 第二发送单元，用于在所述组成载波对应的带宽资源上向基站发送随机接 入前导码；
定时接收单元， 用于接收来自基站的定时提前命令，根据所述定时提前命 令的指示得到所述组成载波的定时提前值。
13、 根据权利要求 12所述的用户设备， 其特征在于， 所述信息获取单元 包括： 信息接收模块， 用于接收竟争解决消息或无线资源控制协议连接重建立 消息，获取携带在所述竟争解决消息或无线资源控制协议连接重建立消息内的 上行带宽分配信息。
14、 根据权利要求 12所述的用户设备， 其特征在于， 所述信息获取单元 包括： 第一资源确定模块， 用于根据所述上行带宽分配信息中包括的至少 1 个组成载波的标识符，确定与该组成载波的标识符对应的带宽资源作为该组成 载波对应的带宽资源； 或者，
所述信息获取单元包括： 第二资源确定模块， 用于根据所述上行带宽分配 信息中包括的至少 1个组成载波组内代表性组成载波的标识符，确定与该代表 性组成载波的标识符对应的带宽资源作为该组成载波组内组成载波对应的带 宽资源， 所述组成载波组内所有组成载波的定时提前值相等。
15、 根据权利要求 12所述的用户设备， 其特征在于， 所述前导码发送单 元包括： 选择发送模块， 用于选择所述第一接收单元在第一组成载波上发送的 随机接入前导码作为在所述组成载波对应的带宽资源上发送的随机接入前导 码。
16、 根据权利要求 12 - 15中任一项所述的用户设备， 其特征在于， 还包 括： 变更执行单元， 用于根据接收到的竟争解决消息、 无线资源控制协议连接 重建立消息、 或自定义消息的指示执行服务小区 /主组成载波的更新， 并将新 的服务小区 /主组成载波的物理层小区标示符、 频率信息等参数作为生成加密 及完整性保护安全密钥的输入参数。
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