WO2013123894A1 - 一种确定同步小区的方法和设备 - Google Patents

一种确定同步小区的方法和设备 Download PDF

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Publication number
WO2013123894A1
WO2013123894A1 PCT/CN2013/071770 CN2013071770W WO2013123894A1 WO 2013123894 A1 WO2013123894 A1 WO 2013123894A1 CN 2013071770 W CN2013071770 W CN 2013071770W WO 2013123894 A1 WO2013123894 A1 WO 2013123894A1
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WIPO (PCT)
Prior art keywords
cell
user equipment
carrier
network side
synchronization
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Application number
PCT/CN2013/071770
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English (en)
French (fr)
Inventor
赵亚利
许芳丽
Original Assignee
电信科学技术研究院
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
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to EP13751105.1A priority Critical patent/EP2819479B1/en
Priority to US14/380,369 priority patent/US9560616B2/en
Publication of WO2013123894A1 publication Critical patent/WO2013123894A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the priority of the Chinese Patent Application for "Method and Apparatus for Determining a Synchronized Cell” is incorporated herein by reference in its entirety.
  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and device for determining a synchronization cell. Background technique
  • the peak rate of the LTE-A (Long Term Evolution-Advanced) system is much higher than that of LTE, requiring downlink lGbps and uplink 500 Mbps.
  • LTE-A systems require good compatibility with LTE systems.
  • the LTE-A system introduces C A (Carrier Aggregation) technology based on the need to increase the peak rate, be compatible with LTE systems, and make full use of spectrum resources.
  • the carrier aggregation technology is that the user equipment can work simultaneously on multiple cells, and one cell includes a pair of UL (uplink) / DL (downlink) CC (Component Carrier) instead of the LTE system and the previous wireless
  • a carrier aggregation system each component carrier may be continuous or non-contiguous, and the bandwidth between the component carriers may be the same or different.
  • the maximum bandwidth limit of each component carrier is 20 MHz. At present, it is generally considered that the maximum number of cells that a user equipment can aggregate is five.
  • LTE-A also classifies the cells of carrier aggregation, which are divided into:
  • PCelK Primary Cell The user equipment aggregates only one cell of the multiple cells is defined as a PCell.
  • the PCell is selected by the base station and configured to the user equipment through RRC (Radio Resource Control) signaling.
  • PUCCH Physical Layer Uplink Control Channel
  • SCell Stemary Cell: All cells except PCell in all cells aggregated by the user equipment are SCells.
  • some cell management and other processes need to frequently search for the aggregated cell of the UE.
  • a cell in an aggregation range can be uniquely determined by a frequency point and a PCI (Physical Cell ID). From the perspective of signaling overhead, a large number of reuse parameters of carrier frequency and PCI can be avoided by introducing a cell number parameter.
  • a UE-level cell number parameter which is encoded as 3 bits, and the number of one cell will be allocated to the UE by the network while adding the cell.
  • the cell number of the primary cell is fixed to 0, and the cell number of the secondary cell is used in the range of 1 to 7.
  • the service of the user equipment may be volatility and suddenness, that is, the amount of traffic is small during a certain period of time, and the traffic volume is large during a certain period of time. When the user equipment traffic is relatively small, for better power saving.
  • the LTE-A system introduces the concept of activation/deactivation, and stipulates that the UE's PCell is not allowed to be deactivated. The default is always active, and the SCell can be activated/deactivated.
  • the UE does not need to perform PDCCH (Physical Downlink Control Channel) listening/PDSCH (Physical Downlink Shared Channel) reception, and does not need to transmit PUSCH (Physical Uplink Shared) Channel, physical uplink shared channel)
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PUSCH Physical Uplink Shared Channel
  • LTE-A R11 is based on improving spectrum efficiency, better supporting HetNet (heterogeneous network) scenarios, and power saving considerations. It decides to enhance downlink transmission and introduces a new downlink carrier, which is called downlink extension carrier.
  • the current protocol supports at least two scenarios, synchronous and asynchronous.
  • the so-called synchronization scenario that is, the carrier/cell in which the extended carrier is backward compatible with at least one LTE system aggregated by the user equipment is time-frequency synchronized, that is, the user equipment does not need to perform additional downlink synchronization processing on the extended carrier.
  • the so-called asynchronous scenario that is, the extended carrier and the user equipment aggregated, the backward compatible carrier/cell of the LTE system is not time-frequency synchronized, and the user equipment needs to perform additional downlink synchronization processing on the extended carrier.
  • a method and device for determining a synchronization cell are provided by an embodiment of the present invention to determine a synchronization cell of an extended carrier, so that the network side and the user equipment can use the extension carrier.
  • the network side device determines an extension carrier that needs to be configured for the user equipment
  • the network side device After determining that the extension carrier is a synchronization extension carrier, the network side device determines a synchronization cell of the extension carrier.
  • Another method for determining a synchronization cell according to an embodiment of the present invention includes:
  • the user equipment After determining that the extension carrier is a synchronization extension carrier, the user equipment determines a synchronization cell of the extension carrier.
  • a first determining module configured to determine an extended carrier that needs to be configured for the user equipment
  • a first processing module configured to determine, after determining that the extension carrier is a synchronous extension carrier, Step community.
  • a second determining module configured to determine an extended carrier that the network side device needs to configure for the user equipment
  • a second processing module configured to determine a synchronization cell of the extended carrier after determining that the extended carrier is a synchronous extended carrier.
  • FIG. 1 is a schematic flowchart of a method for determining a synchronization cell by a network side device according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for a user equipment to determine a synchronization cell according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a new MAC CE format according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a network side device according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the network side device determines the synchronization cell of the extension carrier after determining that the extension carrier to be configured for the user equipment is the synchronization extension carrier, and the extension carrier that the user equipment needs to configure for the user equipment on the network side device. After synchronizing the extension carrier, the synchronization cell of the extension carrier is determined. Since the synchronization cell of the extension carrier can be determined, the network side and the user equipment can use the extension carrier, thereby improving system performance.
  • the synchronization cell may also be referred to as a synchronization carrier.
  • the downlink between the extended carrier and the synchronous cell is synchronized
  • the mobility measurement result of the extended carrier uses the same value as the synchronous carrier;
  • the extended carrier is scheduled by the synchronous cell, or is scheduled by the E-PDCCH (Ehanced Physical Downlink Control Channel) of the extended carrier or other cell scheduling configured by the network side;
  • E-PDCCH Evolutiond Physical Downlink Control Channel
  • the extended carrier and the synchronized cell respectively have independent cell numbers
  • the cell where the extended carrier is located and the synchronous cell belong to the same TA (Time Alignment) group
  • the cell where the extended carrier is located is the same as the downlink timing reference cell used for the uplink transmission by the synchronous cell, and uses the same Uplink timing advance;
  • the cell where the extended carrier is located and the synchronous cell belong to different TA groups is different from the downlink timing reference cell used by the synchronous cell for uplink transmission.
  • the method for determining a synchronization cell by a network side device includes the following steps:
  • Step 101 The network side device determines an extended carrier that needs to be configured for the user equipment.
  • Step 102 After determining that the extension carrier is a synchronous extension carrier, the network side device determines the synchronization cell of the extension carrier. In an implementation, the network side device may determine the type of the extended carrier according to the capability information reported by the UE. For details, refer to the following examples, and details are not described herein.
  • a preferred method is: the network side device first determines whether the user equipment that needs to configure the extension carrier supports the synchronization extension carrier according to the UE capability information reported by the user, and determines After support, the synchronization cell of the extended carrier is determined.
  • the network side device may determine, according to the capability information reported by the user equipment, whether the user equipment supports the extended carrier and/or the supported extended carrier type.
  • the UE capability information only needs to carry the version information. If the system does not have the default R1 1 - support the synchronous extension carrier, the UE capability information can carry the extension.
  • the capability information of the embodiment of the present invention includes but is not limited to part or all of the following information:
  • the protocol version supported by the user device is the protocol version supported by the user device
  • Extended carrier type indication supported by the user equipment is
  • the network side device determines the synchronization cell, and several examples are described below.
  • the network side device selects, from the network side, the LTE system that is configured or configured and activated by the user equipment, and selects the cell with the largest cell number as the synchronization cell; or
  • the network side device selects, from the network side, the LTE system that is configured or configured for the user equipment, and selects the cell with the smallest cell number as the synchronization cell in the backward compatible cell; or
  • the network side device configures or configures the user equipment from the network side and activates the LTE system to select a cell in the backward compatible cell, and the center frequency of the cell is closest to the center frequency of the extended carrier and is lower than the frequency of the extended carrier center frequency.
  • the network side device configures or configures the user equipment from the network side and activates the LTE system to select a cell in the backward compatible cell.
  • the center frequency of the cell is closest to the center frequency of the extended carrier and is higher than the frequency of the extended carrier center frequency.
  • the network side device directly selects the PCell as a synchronous cell.
  • the network side device determines, according to the cross-carrier scheduling relationship configured on the network side, that the cell that schedules the extended carrier is a synchronous cell. Determine the synchronization cell mode
  • the network side device selects, from the network side, the LTE system that is configured or configured and activated by the user equipment, and selects a cell that is covered by the extension carrier to be a synchronization cell; or
  • the network side device selects, from the network side, the LTE system that is configured or configured by the user equipment, and selects a cell that belongs to the same frequency band as the extended carrier or a cell that does not exceed the threshold value of the extended carrier center frequency point as a synchronization cell. ; or
  • the network side device selects, from the network side, the LTE system that is configured or configured and activated by the user equipment, and selects a cell with the same path loss of the extended carrier as the synchronization cell; or
  • the network side device selects, from the network side, the LTE system that is configured or configured and activated by the user equipment, and selects a cell that has a difference from the path loss of the extension carrier that is not greater than the threshold value as a synchronization cell.
  • the backward compatible cells of the LTE system herein include but are not limited to: R8 (Release 8) cells in the R10 system.
  • the method further includes:
  • the network side device notifies the user equipment of the determined identity of the synchronization cell by broadcast or dedicated signaling.
  • a preferred method is: if the network side device and the user equipment agree to use the second mode or the third mode in the method for determining the synchronous cell, or the one of the first method for determining the synchronous cell mode, the network can be guaranteed.
  • the synchronization cell determined by the side device and the user equipment is the same, so that the network side device may not notify the user equipment of the identifier of the determined synchronization cell, thereby saving resources and improving transmission efficiency.
  • the network side device notifies the identification of the determined synchronization cell by dedicated signaling to the dedicated signaling used by the user equipment, including but not limited to one of the following signaling:
  • PDCCH Physical Layer Control Channel
  • the identifier of the synchronization cell in the embodiment of the present invention includes, but is not limited to, one of the following identifiers:
  • ECGI EUTRAN Cell Global Identity
  • EUTRAN Evolved UMTS Terrestrial Radio Access Network
  • the synchronized cell configuration may be based on system configuration; it may also be based on user equipment configuration.
  • the system-based configuration means that the binding between the extension carrier and the synchronization cell is based on the network configuration, and is independent of the user equipment, that is, the synchronization cell corresponding to the same extension carrier in the system is the same for all UEs;
  • the user equipment configuration means that if different user equipments are configured with the same extension carrier, the synchronization cells of the same extension carrier can be different for different user equipments. For example, if the user equipment, B and C are configured with the same extension carrier Z, the user can be configured.
  • the synchronization cell of the extension carrier Z of the device A is A1; the synchronization cell configuring the extension carrier Z of the user equipment B is B1; and the synchronization cell configuring the extension carrier Z of the user equipment C is Cl.
  • the network side device in the embodiment of the present invention may be a base station (such as a macro base station, a home base station, etc.), an RN (relay) device, or other network side devices.
  • a base station such as a macro base station, a home base station, etc.
  • RN relay
  • the method for determining, by the user equipment, the synchronization cell in the embodiment of the present invention includes the following steps:
  • Step 201 The user equipment determines an extension carrier that the network side device needs to configure for the user equipment.
  • Step 202 After determining that the extension carrier is a synchronous extension carrier, the user equipment determines the synchronization cell of the extension carrier.
  • the user equipment may determine, according to the UE capability information, that if the UE capability information indicates that the synchronous extension carrier is supported, the extension carrier may be determined to be a synchronous extension carrier or an asynchronous extension carrier. As an asynchronous extension carrier.
  • the network side device determines it as the synchronous extension carrier mode, which can save some overhead and can have more resources for data transmission (the synchronous extension carrier is lacking compared to the asynchronous extension carrier).
  • the user equipment receives the extended carrier configuration information on the network side, and can determine the judgment result of the extended carrier type on the network side. If it is a synchronous extension carrier, the UE may determine the corresponding synchronization cell according to the indication information of the network side device or determine the corresponding synchronization cell by itself in a preset manner.
  • the method further includes:
  • the capability information of the user equipment to the user equipment on the network side is the capability information of the user equipment to the user equipment on the network side.
  • the capability information of the embodiment of the present invention includes but is not limited to part or all of the following information:
  • the protocol version supported by the user device is the protocol version supported by the user device
  • the extended carrier type indication information supported by the user equipment such as a synchronous extension carrier or an asynchronous extension carrier.
  • the user equipment may determine the synchronization cell of the extension carrier by itself, or determine the synchronization cell of the extension carrier according to the notification of the network side. The following is introduced separately.
  • the user equipment determines the synchronization cell of the extended carrier by itself:
  • the user equipment and the network side device can agree on the method for determining the synchronization cell, so that the network side and the user equipment determine the synchronization cell are the same.
  • Determining the synchronous cell mode The network side device selects the cell with the largest cell number from the LTE system configured or configured and activated by the network side from the network side as the synchronization cell; or
  • the network side device selects, from the network side, the LTE system that is configured or configured for the user equipment, and selects the cell with the smallest cell number as the synchronization cell in the backward compatible cell; or
  • the network side device configures or configures the user equipment from the network side and activates the LTE system to select a cell in the backward compatible cell, and the center frequency of the cell is closest to the center frequency of the extended carrier and is lower than the frequency of the extended carrier center frequency.
  • the network side device configures or configures the user equipment from the network side and activates the LTE system to select a cell in the backward compatible cell.
  • the center frequency of the cell is closest to the center frequency of the extended carrier and is higher than the frequency of the extended carrier center frequency. Community.
  • the network side device directly selects the PCell as the synchronous cell.
  • the synchronous cell mode is determined.
  • the network side device determines, according to the cross-carrier scheduling relationship configured on the network side, that the cell that schedules the extended carrier is a synchronous cell.
  • the user equipment determines the synchronization cell of the extended carrier according to the notification on the network side.
  • the user equipment uses, as the synchronization cell, a cell corresponding to the identifier of the synchronization cell that is received through the broadcast or the dedicated signaling.
  • FIG. 1 and FIG. 2 can synthesize a process, that is, step 101 and step 102 are performed first, and then step 201 and step 202 are performed.
  • Example 1 The base station determines the synchronization cell of the extended carrier, and configures the RRC signaling to the user equipment (requires the user equipment to report the supported aggregate extended carrier capability).
  • Step 1 The user equipment and the base station establish an RRC connection on the cell 1, and report to the base station whether the user equipment supports the aggregate extension carrier and/or the supported aggregate extension carrier type through the user equipment capability reporting process.
  • Step 2 As the traffic increases, the base station needs to increase the number of aggregated cells for the user equipment. For example, an LTE system backward compatible carrier Cell2 and one extended carrier Cell3 need to be added.
  • the addition process of Cell2 is exactly the same as the SCell addition process, and special consideration is required for the addition of Cell3.
  • Step 3 The base station determines the type of the extended carrier Cdl3 according to the user equipment capability report. If the user equipment determines that the user equipment only supports the synchronous extended carrier according to the capability reporting of the user equipment, the type of the Cell3 may be determined as a synchronous extended carrier. If the user equipment is capable of supporting the synchronous extension carrier and the asynchronous extension carrier is supported according to the user equipment capability report, the base station configures or configures and activates the cell according to the current base station, for example, the LTE system backward compatible cell aggregated by the user equipment. Whether there is a cell with the same coverage or the same transmission path as the extension carrier, thereby determining whether Cell3 is processed according to the synchronous extension carrier or the asynchronous extension carrier.
  • Step 4 The base station configures Cell2 and Cell3 for the user equipment.
  • the extension carrier Cell3 if the base station determines that the Cell3 type is a synchronous extension carrier, it needs to configure a synchronization cell for the same while adding the Cell3, and the extended carrier configuration may not include PSS (Primary Synchronization Signaling) / SSS ( Secondary Synchronization Signaling, secondary synchronization signal).
  • PSS Primary Synchronization Signaling
  • SSS Secondary Synchronization Signaling, secondary synchronization signal
  • the synchronization cell configuration can use the frequency point + PCI. If there is a cell index, the cell index can also be used directly.
  • Step 5 The user equipment receives the RRC signaling added by the SCell. If the extended carrier is included in the extended carrier configuration information, the user equipment processes the extended carrier as the synchronous extended carrier, and considers the downlink synchronization of the extended carrier. Depends on its synchronization cell; otherwise, as asynchronous extended cell processing, its downlink timing is obtained from the extension carrier's own signal transmission.
  • Step 6 The base station can reconfigure the synchronization cell for the extended carrier by using RRC signaling as needed.
  • Example 2 The base station determines the synchronization cell of the extended carrier, and configures the RRC signaling to the user equipment (the user equipment is not required to report what type of extended carrier capability is aggregated).
  • Step 1 The user equipment and the base station establish an RRC connection on Cell 1.
  • Step 2 As the traffic increases, the base station needs to increase the number of aggregated cells for the user equipment. For example, an LTE system backward compatible carrier Cell2 and one extended carrier Cell3 need to be added.
  • the addition process of Cell2 is exactly the same as the SCell addition process, and special consideration is required for the addition of Cell3.
  • Step 3 The base station determines whether the user equipment supports the aggregate synchronous extension carrier according to the user equipment version. If the user equipment version supports the aggregation synchronization extension carrier, the base station may configure or activate the user equipment according to the current base station support or the base station is configured for the user equipment. Whether the cell has the same frequency coverage or the same transmission path as the extension carrier, and if so, the extension carrier type may be determined as a synchronous extension carrier, otherwise the carrier type may be determined as an asynchronous extension carrier.
  • Step 4 The base station configures Cell2 and Cell3 for the user equipment.
  • the extended carrier Cell3 if the base station determines that the Cell3 type is a synchronous extension carrier, it needs to be configured with a synchronization cell while adding the Cell3.
  • the sync cell configuration can use the frequency point +PCI. If there is a cell index, you can also use the cell index directly.
  • Step 5 The user equipment receives the RRC signaling added by the SCell. If the extended carrier is included in the extended carrier configuration information, the user equipment processes the extended carrier as the synchronous extended carrier, and considers the downlink synchronization of the extended carrier. Depends on its synchronization cell; otherwise, as asynchronous extended cell processing, its downlink timing is obtained from the extension carrier's own signal transmission.
  • Step 6 The base station can reconfigure the synchronization cell for the extended carrier by using RRC signaling as needed.
  • Example 3 The base station determines a synchronization cell of the extended carrier, and configures the user to the user equipment by using MAC signaling.
  • Step 1 The user equipment and the base station establish an RRC connection on the cell 1, and report to the base station whether the user equipment supports the aggregate extension carrier and/or the supported aggregate extension carrier type through the user equipment capability reporting process.
  • Step 2 As the traffic increases, the base station needs to increase the number of aggregated cells for the user equipment. For example, one LTE system backward compatible carrier Cell2 and one extended carrier Cell3 need to be added. Cell2 addition process and SCell addition process It is completely consistent, and special consideration is required for the increase of Cdl3.
  • Step 3 The base station determines the type of the extended carrier Cell3 according to the user equipment capability report. If the user equipment capability reports that the user equipment only supports the synchronous extended carrier, the Cell3 type may be determined as the synchronous extended carrier. If the user equipment is capable of reporting the user equipment, that is, the synchronous extension carrier is supported, and the asynchronous extension carrier is supported, the base station is configured according to whether the current base station is configured or configured and activated by the user equipment, for example, whether the LTE system is backward compatible with the user equipment aggregation. There is a cell with the same coverage or the same transmission path as the extension carrier, thereby determining whether Cell3 is processed according to the synchronous extension carrier or the asynchronous extension carrier.
  • Step 4 The base station configures Cell2 and Cell3 for the user equipment. For Cell3, if the base station determines that its type is synchronous extended carrier, its configuration may not include PSS/SSS configuration information.
  • Step 5 The base station needs to pass the MAC CE (MAC Control) while configuring the extended carrier for the user equipment.
  • MAC CE MAC Control
  • the media access layer control unit notifies the user equipment of the synchronized cell of the extended carrier.
  • the MAC CE can be used alone or combined with the activation/deactivation MAC CE to form a MAC CE.
  • the first byte of the MAC CE is used to indicate the activation signaling
  • the second byte is used to indicate the synchronization carrier corresponding to the extended carrier.
  • a new LCID Logical Channel ID
  • Step 6 The base station ensures that the user equipment can receive the synchronization cell configuration of the extension carrier before activating the extension carrier. Once the user equipment receives the synchronization carrier configuration of the extension carrier, it considers that the downlink synchronization of the extension carrier depends on its synchronization cell; otherwise, if the base station does not receive the synchronization cell configuration, the extension carrier is treated as an asynchronous extension carrier, The extended carrier self-signal transmission acquires its downlink timing.
  • Step 7 The base station can reconfigure the synchronization cell for the extended carrier by using RRC signaling as needed.
  • Step 1 The user equipment and the base station establish an RRC connection on the cell 1, and report to the base station whether the user equipment supports the aggregate extension carrier and/or the supported aggregate extension carrier type through the user equipment capability reporting process.
  • Step 2 As the traffic increases, the base station needs to increase the number of aggregated cells for the user equipment. For example, an LTE system backward compatible carrier Cell2 and one extended carrier Cell3 need to be added.
  • the addition process of Cell2 is exactly the same as the SCell addition process, and special consideration is required for the addition of Cell3.
  • Step 3 If the user equipment capability report information includes whether the user equipment supports the aggregate extension carrier and/or the supported aggregation extension carrier type, the base station may configure the user equipment or the base station as the user according to the user equipment capability and the current base station support situation.
  • the cell configuration in which the device is configured and activated determines the type of the extended carrier.
  • the base station may determine that the extension carrier type is a synchronous extension carrier, and the base station needs to ensure that the PCell and the extension carrier are Downstream synchronization.
  • Step 4 The base station configures Cell2 and Cell3 for the user equipment.
  • the extension carrier Cell3 if it is a synchronous extension carrier, the base station does not need to configure PSS/SSS for it.
  • Step 5 The user equipment receives the configuration information of Cell3. If the PSC/SSS configuration is not included in the extended carrier, the user equipment may process the extended carrier as a synchronous extended carrier, and consider that the downlink synchronization of the extended carrier depends on its synchronous cell. PCell; otherwise, the extension carrier is considered to be an asynchronous extension carrier, and downlink synchronization of the extension carrier is obtained by self signal transmission.
  • a network side device is further provided in the embodiment of the present invention.
  • the method for solving the problem is similar to the method for determining the synchronization cell by the network side device in the embodiment of the present invention. Therefore, the implementation of the device may refer to the method. Implementation, repetition will not be repeated.
  • the network side device of the embodiment of the present invention includes: a first determining module 40 and a first processing module 41.
  • a first determining module 40 configured to determine an extended carrier that needs to be configured for the user equipment;
  • the first processing module 41 is configured to determine a synchronization cell of the extended carrier after determining that the extension carrier is a synchronous extension carrier. Preferably, the first processing module 41 determines that the synchronization cell of the extension carrier is determined after the user equipment supports the synchronization extension carrier.
  • the first processing module 41 determines, according to the capability information reported by the user equipment, whether the user equipment supports the extended carrier and/or the supported extended carrier type.
  • the first processing module 41 determines the synchronization cell in one of the following ways:
  • the LTE system configured or configured and activated by the user equipment to the cell that is covered by the extended carrier to the compatible cell;
  • the LTE system configured or configured and activated by the user equipment to select the cell with the largest cell number in the compatible cell
  • the LTE system configured or configured and activated by the user equipment to select the cell with the smallest cell number in the compatible cell
  • the LTE system configured or configured and activated by the network device from the network side selects a cell whose center frequency point of the cell is closest to the center frequency of the extended carrier and lower than the extended carrier center frequency point to the compatible cell;
  • the LTE system configured or configured and activated by the user equipment from the network side selects a cell whose center frequency point of the cell is closest to the center frequency of the extended carrier and is higher than the center frequency of the extended carrier to the compatible cell;
  • the cell that schedules the extended carrier is determined to be a synchronous cell according to the cross-carrier scheduling relationship configured on the network side.
  • the first processing module 41 notifies the user equipment of the determined identity of the synchronization cell by broadcast or dedicated signaling.
  • a user equipment is also provided in the embodiment of the present invention.
  • the method for solving the problem is similar to the method for determining the synchronization cell by the user equipment in the embodiment of the present invention. Therefore, the implementation of the device may refer to the implementation of the method. The repetitions are not repeated here.
  • the user equipment in the embodiment of the present invention includes: a second determining module 50 and a second processing module 51.
  • a second determining module 50 configured to determine an extended carrier that the network side device needs to configure for the user equipment;
  • the second processing module 51 is configured to determine a synchronization cell of the extended carrier after determining that the extension carrier is a synchronous extension carrier. Preferably, the second processing module 51 reports the capability information of the user equipment to the network side before determining the synchronization cell. Preferably, the second processing module 51 determines the synchronization cell in one of the following ways:
  • the LTE system configured or configured and activated by the user equipment to select the cell with the largest cell number in the compatible cell
  • the LTE system configured or configured and activated by the user equipment to select the cell with the smallest cell number in the compatible cell
  • the LTE system configured or configured and activated by the network device from the network side selects a cell whose center frequency point of the cell is closest to the center frequency of the extended carrier and lower than the extended carrier center frequency point to the compatible cell;
  • the LTE system configured or configured and activated by the network device from the network side selects a cell whose center frequency point of the cell is closest to the center frequency of the extended carrier and is higher than the center frequency of the extended carrier to the compatible cell;
  • the cell that schedules the extended carrier is determined to be a synchronous cell according to the cross-carrier scheduling relationship configured on the network side.
  • the second processing module 51 uses the cell corresponding to the identifier of the synchronization cell received by the broadcast or dedicated signaling as the synchronization cell.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明实施例涉及无线通信技术领域，特别涉及一种确定同步小区的方法和设备，用以确定扩展载波的同步小区，使得网络侧和用户设备能够使用扩展载波。本发明确定同步小区的方法包括：网络侧设备确定需要为用户设备配置的扩展载波；网络侧设备在确定所述扩展载波为同步扩展载波后，确定所述扩展载波的同步小区。由于能够确定扩展载波的同步小区，使得网络侧和用户设备能够使用扩展载波，从而提高了系统性能。

Description

一种确定同步小区的方法和设备 本申请要求在 2012年 02月 24日提交中国专利局、 申请号为 201210046648.3、发明名称为
"一种确定同步小区的方法和设备 "的中国专利申请的优先权，其全部内容通过引用结合在本申 请中。 技术领域 本发明涉及无线通信技术领域， 特别涉及一种确定同步小区的方法和设备。 背景技术
LTE-A ( Long Term Evolution- Advanced, 长期演进高级） 系统的峰值速率较 LTE有很 大的提高， 要求达到下行 lGbps, 上行 500Mbps。 同时， LTE-A系统要求和 LTE系统有很好 的兼容性。 基于提高峰值速率、 与 LTE系统兼容以及充分利用频谱资源的需要， LTE-A系 统引入了 C A ( Carrier Aggregation , 载波聚合 )技术。
载波聚合技术是用户设备可以在多个小区上同时工作， 一个小区包含一对 UL (上行链 路） / DL (下行链路） CC (成员载波， Component Carrier ) , 而不是 LTE系统以及之前的 无线通信系统中只有一套载波的模式。 在载波聚合的系统中各个成员载波可以是连续的， 也可以是非连续的， 各成员载波间的带宽可以相同或不同， 为了保持和 LTE系统兼容， 每 个成员载波的最大带宽限制为 20MHz。 目前一般认为用户设备可以聚合的小区个数最大个 数为 5个。 此外， LTE-A还对载波聚合的小区进行了分类， 分为：
PCelK Primary Cell,主小区）：用户设备聚合多个小区中只有一个小区被定义为 PCell, PCell由基站选择， 并通过 RRC ( Radio Resource Control, 无线资源控制）信令配置给用户 设备。只有 PCell上配置有 PUCCH( Physical Uplink Control Channel,物理层上行控制信道）；
SCell (辅小区, Secondary Cell ) ： 用户设备聚合的所有小区中除了 PCell之外的小区 都是 SCell。
在 CA系统中， 一些小区管理等过程（例如删除一个辅小区、 重配一个辅小区、 激活 / 去激活一个辅小区、 服务小区的信号盾量上报等）需要经常对 UE的聚合小区进行检索。一 个聚合范围内的小区可以被频点和 PCI ( Physical Cell ID, 小区物理标识）唯一确定。 从信 令开销的角度出发， 可以通过引入小区编号参数来避免大量重复使用载波频率和 PCI这两 个参数。 目前标准讨论中已经决定引入 UE级别的小区编号参数， 编码为 3bit, —个小区的 编号将会在新增该小区的同时由网络分配给 UE。 主小区的小区编号固定为 0 , 辅小区的小 区标号使用范围为 1~7。 由于用户设备的业务可能具有波动性和突发性， 即某段时间内业务量很少， 而某段时 间内业务量很大， 当用户设备业务量比较少的时候， 为了更好的节电， LTE-A系统引入了 激活 /去激活的概念，并规定 UE的 PCell不允许被去激活，默认一直处于激活状态，而对 SCell 可以进行激活 /去激活操作。
对于去激活的载波， UE不需要执行 PDCCH ( Physical Downlink Control Channel, 物理 下行链路控制信道）监听/ PDSCH ( Physical Downlink Shared Channel, 物理下行链路共享 信道）接收， 不需要发送 PUSCH ( Physical Uplink Shared Channel,物理上行链路共享信道）
/SRS ( Sounding Reference Signal, 探测用参考信号） /CQI ( Channel Quality Indicator, 信道 盾量指示）等， 这样就可以达到更好的节电效果。
LTE-A R11基于提高频谱效率、 更好的支持 HetNet (异构网）场景以及节电的考虑， 决定对下行传输做增强， 引入一种新的下行载波， 这里称之为下行扩展载波。
在下行扩展载波设计时， 目前协议至少支持同步和异步两种场景。 所谓同步场景， 即 扩展载波至少和用户设备聚合的一个 LTE系统后向兼容的载波 /小区是时频同步的， 即用户 设备不需要对扩展载波进行额外的下行同步处理。 所谓异步场景， 即扩展载波和用户设备 聚合的任何一个 LTE系统后向兼容的关载波 /小区都不是时频同步的， 用户设备需要对扩展 载波进行额外的下行同步处理。
目前虽然规定有扩展载波， 但是并没有确定扩展载波的同步小区的相关机制， 使得网 络侧和用户设备无法使用扩展载波。 发明内容 本发明实施例提供的一种确定同步小区的方法和设备， 用以确定扩展载波的同步小 区， 使得网络侧和用户设备能够使用扩展载波。
本发明实施例提供的一种确定同步小区的方法， 包括：
网络侧设备确定需要为用户设备配置的扩展载波；
网络侧设备在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同步小区。 本发明实施例提供的另一种确定同步小区的方法， 包括：
用户设备确定网络侧设备需要为所述用户设备配置的扩展载波；
所述用户设备在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同步小 区。
本发明实施例提供的一种确定同步小区的网络侧设备， 包括：
第一确定模块， 用于确定需要为用户设备配置的扩展载波；
第一处理模块， 用于在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同 步小区。
本发明实施例提供的一种确定同步小区的用户设备， 包括：
第二确定模块， 用于确定网络侧设备需要为所述用户设备配置的扩展载波； 第二处理模块， 用于在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同 步小区。
本发明实施例提供的一种确定同步小区的方法和设备， 网络侧设备在确定所述扩展载 波为同步扩展载波后， 确定扩展载波的同步小区， 由于能够确定扩展载波的同步小区， 使 得网络侧和用户设备能够使用扩展载波， 从而提高了系统性能。 附图说明 图 1为本发明实施例网络侧设备确定同步小区的方法流程示意图；
图 2为本发明实施例用户设备确定同步小区的方法流程示意图；
图 3为本发明实施例新的 MAC CE格式示意图；
图 4为本发明实施例网络侧设备的结构示意图；
图 5为本发明实施例用户设备的结构示意图。 具体实施方式 本发明实施例网络侧设备在确定需要为用户设备配置的扩展载波为同步扩展载波后 , 确定扩展载波的同步小区； 以及用户设备在确定网络侧设备需要为用户设备配置的扩展载 波为同步扩展载波后， 确定扩展载波的同步小区。 由于能够确定扩展载波的同步小区， 使 得网络侧和用户设备能够使用扩展载波， 从而提高了系统性能。
其中， 同步小区也可以称为同步载波。
在实施中， 扩展载波与同步载波绑定后还可以釆用下列功能中的至少一种：
1、 扩展载波与同步小区下行同步；
2、 扩展载波和同步小区使用相同的路损参考；
3、 扩展载波的移动性测量结果与同步载波使用相同值；
4、 同步小区被去激活后， 扩展载波也被去激活；
5、扩展载波由同步小区调度，或通过扩展载波的 E-PDCCH( Ehanced Physical Downlink Control Channel, 增强的物理层控制信道）调度或通过网络侧配置的其它小区调度；
6、 扩展载波和同步小区分别具有独立的小区编号；
7、 扩展载波所在小区与同步小区属于相同 T A ( Time Alignment , 定时提前）组时， 扩 展载波所在小区与同步小区所使用用于上行传输的下行定时参考小区相同， 且使用相同的 上行定时提前量；
8、 扩展载波所在小区与同步小区属于不同 TA组时， 扩展载波所在小区与同步小区所 使用的用于上行传输的下行定时参考小区不同。
下面结合说明书附图对本发明实施例作进一步详细描述。
如图 1所示， 本发明实施例网络侧设备确定同步小区的方法包括下列步骤：
步骤 101、 网络侧设备确定需要为用户设备配置的扩展载波；
步骤 102、 网络侧设备在确定扩展载波为同步扩展载波后， 确定扩展载波的同步小区。 在实施中， 网络侧设备可以根据 UE上报的能力信息确定扩展载波的类型。具体方式可 以参见下面的实例， 在此不再赘述。
由于并非所有的用户设备都支持同步扩展载波， 所以一种较佳地方式是： 网络侧设备 首先根据用户上报的 UE能力信息先判断需要配置扩展载波的用户设备是否支持同步扩展 载波， 并在确定支持后， 再确定扩展载波的同步小区。
具体的， 网络侧设备可以根据用户设备上报的能力信息， 确定用户设备是否支持扩展 载波和 /或支持的扩展载波类型。
比如， 如果系统默认 Rl l UE均支持同步扩展载波， 那么 UE能力信息中只需要携带版 本信息即可； 如果系统没有默认 Rl 1—定支持同步扩展载波， 那么 UE能力信息中可以携带 是否支持扩展载波以及支持的扩展载波类型指示或者只携带支持的扩展载波类型指示。
较佳地， 本发明实施例的能力信息包括但不限于如下部分或者全部信息：
用户设备支持的协议版本；
用户设备是否支持扩展载波的能力指示；
用户设备支持的扩展载波类型指示。
在实施中， 网络侧设备确定同步小区的方式有很多种， 下面举例介绍几种。
确定同步小区方式一、
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区编号最大的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区编号最小的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区的中心频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区为同步小 区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区的中心频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区为同步小 区。 确定同步小区方式二、
网络侧设备直接选择 PCell为同步小区。
确定同步小区方式三、
网络侧设备根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。 确定同步小区方式四、
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 一个与扩展载波同覆盖的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 一个与扩展载波属于同一个频带的小区或者与扩展载波中心频点间隔不大于阈值的小区 为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 一个与扩展载波的路损相同的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 一个与扩展载波的路损的差值不大于阈值的小区为同步小区。
这里的 LTE系统后向兼容的小区包括但不限于： R8 (版本 8 ) R10系统中的小区。 较佳地， 步骤 102之后， 还可以进一步包括：
网络侧设备将确定的同步小区的标识通过广播或专用信令通知用户设备。
一种较佳地方式是： 如果网络侧设备和用户设备约定釆用上面确定同步小区方式中的 方式二或方式三， 或者约定釆用确定同步小区方式一中的某一种， 则可以保证网络侧设备 和用户设备确定的同步小区是相同， 这样网络侧设备可以不将确定的同步小区的标识通知 给用户设备， 从而可以节省资源， 提高传输效率。
在实施中， 网络侧设备将确定的同步小区的标识通过专用信令通知用户设备所使用的 专用信令包括但不限于下列信令中的一种：
RRC信令；
MAC ( Medium Access Control, 媒体接入控制 )信令；
PDCCH ( Physical Downlink Control Channel, 物理层控制信道）信令。
其中， 本发明实施例的同步小区的标识包括但不限于下列标识中的一种：
频点和 PCI;
ECGI ( EUTRAN Cell Global Identity, EUTRAN小区全球标识； EUTRAN, Evolved UMTS Terrestrial Radio Access Network, 演进的 UMTS陆地无线接入网； UMTS, Universal Mobile TelecommunicationSy stem, 通用移动通信系统) ；
小区编号。
在实施中， 同步小区配置可以基于系统配置； 也可以基于用户设备配置。 基于系统配置就是指扩展载波和同步小区的绑定是基于网络配置的， 与用户设备无 关， 即该系统中同一个扩展载波对应的同步小区对所有 UE而言都是相同的；
基于用户设备配置就是指若不同用户设备配置同一个扩展载波， 对于不同用户设备， 同一个扩展载波的同步小区可以不同， 比如为用户设备 、 B和 C配置同一个扩展载波 Z, 则可以配置用户设备 A的扩展载波 Z的同步小区是 A1 ; 配置用户设备 B的扩展载波 Z的同步 小区是 B1 ; 配置用户设备 C的扩展载波 Z的同步小区是 Cl。
在实施中， 本发明实施例的网络侧设备可以是基站（比如宏基站、 家庭基站等） ， 也 可以是 RN (中继）设备， 还可以是其它网络侧设备。
如图 2所示， 本发明实施例用户设备确定同步小区的方法包括下列步骤：
步骤 201、 用户设备确定网络侧设备需要为用户设备配置的扩展载波；
步骤 202、 用户设备在确定扩展载波为同步扩展载波后， 确定扩展载波的同步小区。 在实施中， 用户设备可以基于 UE能力信息判断， 如果 UE能力信息指示支持同步扩展 载波， 则可以判断扩展载波为同步扩展载波或者异步扩展载波， 如果 UE能力信息指示只支 持异步， 则只能配置为异步的扩展载波。
如果用户设备支持同步扩展载波， 网络侧设备一般就会将其确定为同步扩展载波方 式， 这样可以节省一些开销， 可以有更多的资源用于数据传输（同步扩展载波相比于异步 扩展载波缺少一些配置， 比如 PSS/CSS ) ；
由于同步载波和异步载波的配置信息不同， 因此用户设备接收到网络侧的扩展载波配 置信息， 就可以确定网络侧对该扩展载波类型的判断结果。 如果是同步扩展载波， 那么 UE 可以按照网络侧设备的指示信息确定对应的同步小区或釆用预先设定的方式自己确定对 应的同步小区。
较佳地， 步骤 202之前还可以进一步包括：
用户设备向网络侧上 4艮用户设备的能力信息。
较佳地， 本发明实施例的能力信息包括但不限于如下部分或者全部信息：
用户设备支持的协议版本；
用户设备是否支持扩展载波的能力指示；
用户设备支持的扩展载波类型指示信息， 比如是同步扩展载波还是异步扩展载波。 步骤 202中， 用户设备可以自己确定扩展载波的同步小区， 也可以根据网络侧的通知 确定扩展载波的同步小区。 下面分别进行介绍。
一、 用户设备自己确定扩展载波的同步小区：
具体的， 用户设备和网络侧设备可以约定釆用什么方式确定同步小区， 这样不需要网 络侧通知就可以保证网络侧和用户设备确定的同步小区相同。
具体的约定方式包括但不限于下列方式中的一种： 确定同步小区方式一、 网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统 后向兼容的小区中选择小区编号最大的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区编号最小的小区为同步小区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区的中心频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区为同步小 区； 或
网络侧设备从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择 小区的中心频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区为同步小 区。
确定同步小区方式二、 网络侧设备直接选择 PCell为同步小区。
确定同步小区方式三、 网络侧设备根据网络侧配置的跨载波调度关系确定调度扩展载 波的小区为同步小区。
二、 用户设备根据网络侧的通知确定扩展载波的同步小区。
具体的， 用户设备将通过广播或专用信令接收的同步小区的标识对应的小区作为同步 小区。
在实施中， 若釆用网络侧设备通知用户设备同步小区的方式， 则图 1和图 2可以合成一 个流程， 即先执行步骤 101和步骤 102 , 再执行步骤 201和步骤 202。
下面列举几个实例对本发明的方案进行说明。
实例一、 基站确定扩展载波的同步小区， 并通过 RRC信令配置给用户设备（需要用户 设备上报支持的聚合扩展载波能力） 。
步骤 1 : 用户设备和基站在 Cell 1上建立 RRC连接， 并通过用户设备能力上报过程向基 站上报用户设备是否支持聚合扩展载波和 /或所支持的聚合扩展载波类型。
步骤 2: 随着业务量增加， 基站需要为用户设备增加聚合的小区个数， 比如需要增加 一个 LTE系统后向兼容载波 Cell2和一个扩展载波 Cell3。 Cell2的增加过程和 SCell添加流程 完全一致， 对于 Cell3增加需要特殊考虑。
步骤 3 : 基站根据用户设备能力上报确定该扩展载波 Cdl3的类型， 如果根据用户设备 的能力上报确定用户设备只支持同步扩展载波， 那么可以将 Cell3类型确定为同步扩展载 波。 如果根据用户设备能力上报确定用户设备即支持同步扩展载波也支持异步扩展载波， 那么由基站根据当前基站为用户设备配置或者配置且激活的小区的情况， 比如用户设备聚 合的 LTE系统后向兼容小区中是否有和扩展载波同频同覆盖或者传输路径相同的小区， 从 而决定 Cell3是按照同步扩展载波还是按照异步扩展载波处理。
步骤 4: 基站为用户设备配置 Cell2和 Cell3。 对于扩展载波 Cell3 , 如果基站确定 Cell3类型为同步扩展载波， 那么需要在添加 Cell3 的同时为其配置同步小区， 且该扩展载波配置中可以不包含 PSS ( Primary Synchronization Signaling, 主同步信号） /SSS ( Secondary Synchronization Signaling, 辅同步信号） 。 同步 小区配置可以釆用频点 +PCI,如果有小区编号（ cell index )，那么也可以直接使用 cell index。
步骤 5 : 用户设备接收到 SCell添加的 RRC信令， 如果其中包含扩展载波且扩展载波配 置信息中包含同步小区配置， 那么用户设备将该扩展载波作为同步扩展载波处理， 认为该 扩展载波的下行同步依赖于其同步小区； 否则， 当作异步扩展小区处理， 从该扩展载波自 身信号传输获取其下行定时。
步骤 6: 基站根据需要可以通过 RRC信令为扩展载波重配同步小区。
实例二、 基站确定扩展载波的同步小区， 并通过 RRC信令配置给用户设备（不需要用 户设备上报聚合何种类型的扩展载波能力） 。
步骤 1： 用户设备和基站在 Cell 1上建立 RRC连接。
步骤 2: 随着业务量增加， 基站需要为用户设备增加聚合的小区个数， 比如需要增加 一个 LTE系统后向兼容载波 Cell2和一个扩展载波 Cell3。 Cell2的增加过程和 SCell添加流程 完全一致， 对于 Cell3增加需要特殊考虑。
步骤 3 : 基站根据用户设备版本确定用户设备是否支持聚合同步扩展载波， 如果用户 设备版本支持聚合同步扩展载波， 那么基站可以根据当前基站支持或者基站为用户设备配 置或者基站为用户设备配置且激活的小区中是否有和该扩展载波同频同覆盖或者传输路 径一致的小区， 如果有， 那么可以将该扩展载波类型确定为同步扩展载波， 否则可以将该 载波类型确定为异步扩展载波。
步骤 4: 基站为用户设备配置 Cell2和 Cell3。 对于扩展载波 Cell3 , 如果基站确定 Cell3类 型为同步扩展载波， 那么需要在添加 Cell3的同时为其配置同步小区。 同步小区配置可以釆 用频点 +PCI, 如果有 cell index, 那么也可以直接使用 cell index。
步骤 5 : 用户设备接收到 SCell添加的 RRC信令， 如果其中包含扩展载波且扩展载波配 置信息中包含同步小区配置， 那么用户设备将该扩展载波作为同步扩展载波处理， 认为该 扩展载波的下行同步依赖于其同步小区； 否则， 当作异步扩展小区处理， 从该扩展载波自 身信号传输获取其下行定时。
步骤 6: 基站根据需要可以通过 RRC信令为扩展载波重配同步小区。
实例三、 基站确定扩展载波的同步小区， 并通过 MAC信令配置给用户设备。
步骤 1 : 用户设备和基站在 Cell 1上建立 RRC连接， 并通过用户设备能力上报过程向基 站上报用户设备是否支持聚合扩展载波和 /或所支持的聚合扩展载波类型。
步骤 2: 随着业务量增加， 基站需要为用户设备增加聚合的小区个数， 比如需要增加 一个 LTE系统后向兼容载波 Cell2和一个扩展载波 Cell3。 Cell2的增加过程和 SCell添加流程 完全一致， 对于 Cdl3增加需要特殊考虑。
步骤 3 : 基站根据用户设备能力上报确定该扩展载波 Cell3的类型， 如果用户设备能力 上报用户设备只支持同步扩展载波， 那么可以将 Cell3类型确定为同步扩展载波。 如果用户 设备能力上报用户设备即支持同步扩展载波也支持异步扩展载波， 那么由基站根据当前基 站为用户设备配置或者配置且激活的小区的情况， 比如用户设备聚合的 LTE系统后向兼容 小区中是否有和扩展载波同频同覆盖或者传输路径相同的小区，从而决定 Cell3是按照同步 扩展载波还是按照异步扩展载波处理。
步骤 4: 基站为用户设备配置 Cell2和 Cell3。 对于 Cell3 , 如果基站确定其类型为同步扩 展载波， 其配置中可以不包含 PSS/SSS配置信息。
步骤 5 : 基站为用户设备配置扩展载波的同时， 需要通过 MAC CE ( MAC Control
Element, 媒体接入层控制单元）通知用户设备该扩展载波的同步小区。
其中， 该 MAC CE可以单独使用， 也可以和激活 /去激活 MAC CE合并为一个 MAC CE。 比如 MAC CE第一个 byte用于指示激活信令， 第二个 byte用于指示扩展载波对应的同步载 波。 为了标识该新的 MAC CE格式， 还需要引入新的 LCID ( Logical Channel ID, 逻辑信道 号） 。 以 MAC CE单独使用为例， 其格式可以参见图 3。
步骤 6: 基站要保证用户设备在激活该扩展载波之前能够接收到该扩展载波的同步小 区配置。 一旦用户设备接收到该扩展载波的同步载波配置， 则认为该扩展载波的下行同步 依赖于其同步小区； 否则， 如果基站未收到同步小区配置， 则将扩展载波当作异步扩展载 波处理， 从该扩展载波自身信号传输获取其下行定时。
步骤 7: 基站根据需要可以通过 RRC信令为扩展载波重配同步小区。
实例四、 隐式确定， 使用 PCell。
步骤 1 : 用户设备和基站在 Cell 1上建立 RRC连接， 并通过用户设备能力上报过程向基 站上报用户设备是否支持聚合扩展载波和 /或所支持的聚合扩展载波类型。
步骤 2: 随着业务量增加， 基站需要为用户设备增加聚合的小区个数， 比如需要增加 一个 LTE系统后向兼容载波 Cell2和一个扩展载波 Cell3。 Cell2的增加过程和 SCell添加流程 完全一致， 对于 Cell3增加需要特殊考虑。
步骤 3： 如果用户设备能力上报信息包含用户设备是否支持聚合扩展载波和 /或支持的 聚合扩展载波类型， 那么基站可以根据用户设备能力以及当前基站支持情况、 或者基站为 用户设备配置或者基站为用户设备配置且激活的小区情况确定该扩展载波的类型。
比如用户设备支持聚合同步扩展载波， 且当前用户设备聚合的激活小区中有和扩展载 波同覆盖的小区， 那么基站可以确定该扩展载波类型为同步扩展载波， 并且基站需要保证 PCell和该扩展载波是下行同步的。
步骤 4: 基站为用户设备配置 Cell2和 Cell3。 对于扩展载波 Cell3 , 如果其为同步扩展载波， 那么基站不需要为其配置 PSS/SSS。 步骤 5: 用户设备接收到 Cell3的配置信息， 如果该扩展载波上不包含 PSS/SSS配置， 那 么用户设备可以将该扩展载波作为同步扩展载波处理， 认为该扩展载波的下行同步依赖于 其同步小区 PCell; 否则， 认为该扩展载波为异步扩展载波， 通过自身信号传输获取该扩展 载波的下行同步。
基于同一发明构思， 本发明实施例中还提供了一种网络侧设备， 由于该设备解决问题 的原理与本发明实施例网络侧设备确定同步小区的方法相似， 因此这些设备的实施可以参 见方法的实施， 重复之处不再赘述。
如图 4所示， 本发明实施例的网络侧设备包括： 第一确定模块 40和第一处理模块 41。 第一确定模块 40 , 用于确定需要为用户设备配置的扩展载波；
第一处理模块 41 ,用于在确定扩展载波为同步扩展载波后，确定扩展载波的同步小区。 较佳地， 第一处理模块 41确定用户设备支持同步扩展载波之后， 确定扩展载波的同步 小区。
较佳地， 第一处理模块 41根据用户设备上报的能力信息， 确定用户设备是否支持扩展 载波和 /或支持的扩展载波类型。
较佳地， 第一处理模块 41釆用下列方式中的一种确定同步小区：
选择 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波同覆盖的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波属于同一个频带的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损相同的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损的差值不大于阈值的小区； 或
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区； 根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。 较佳地， 第一处理模块 41将确定的同步小区的标识通过广播或专用信令通知用户设 备。
基于同一发明构思， 本发明实施例中还提供了一种用户设备， 由于该设备解决问题的 原理与本发明实施例用户设备确定同步小区的方法相似， 因此这些设备的实施可以参见方 法的实施， 重复之处不再赘述。
如图 5所示， 本发明实施例的用户设备包括： 第二确定模块 50和第二处理模块 51。 第二确定模块 50 , 用于确定网络侧设备需要为用户设备配置的扩展载波；
第二处理模块 51 ,用于在确定扩展载波为同步扩展载波后，确定扩展载波的同步小区。 较佳地， 第二处理模块 51确定同步小区之前， 向网络侧上报用户设备的能力信息。 较佳地， 第二处理模块 51釆用下列方式中的一种确定同步小区：
选择主小区 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区；
根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。
较佳地， 第二处理模块 51将通过广播或专用信令接收的同步小区的标识对应的小区作 为同步小区。
本领域内的技术人员应明白， 本发明的实施例可提供为方法、 系统、 或计算机程序产 品。 因此， 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实 施例的形式。 而且， 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 （包括但不限于磁盘存储器、 CD-ROM、 光学存储器等）上实施的计算机程 序产品的形式。
本发明是参照根据本发明实施例的方法、 设备（系统） 、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器， 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中， 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品， 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上， 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理， 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例， 但本领域内的技术人员一旦得知了基本创造性概 念， 则可对这些实施例作出另外的变更和修改。 所以， 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然， 本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实 施例的精神和范围。 这样， 倘若本发明实施例的这些修改和变型属于本发明权利要求及其 等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种确定同步小区的方法， 其特征在于， 该方法包括：
网络侧设备确定需要为用户设备配置的扩展载波；
网络侧设备在确定所述扩展载波为同步扩展载波后 , 确定所述扩展载波的同步小区。
2、 如权利要求 1所述的方法， 其特征在于， 所述网络侧设备确定所述扩展载波的同步 小区之前， 还包括：
所述网络侧设备确定所述用户设备支持同步扩展载波。
3、 如权利要求 2所述的方法， 其特征在于， 所述网络侧设备确定所述用户设备支持同 步扩展载波包括：
所述网络侧设备根据所述用户设备上 4艮的能力信息， 确定所述用户设备是否支持扩展 载波和 /或支持的扩展载波类型。
4、如权利要求 3所述的方法， 其特征在于， 所述能力信息包含如下部分或者全部信息： 用户设备支持的协议版本；
用户设备是否支持扩展载波的能力指示；
用户设备支持的扩展载波类型指示。
5、 如权利要求 1所述的方法， 其特征在于， 所述网络侧设备釆用下列方式中的一种确 定同步小区：
选择主小区 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波同覆盖的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波属于同一个频带或者与扩展载波中心频点的频域间隔不大于阈值的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损相同的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损的差值不大于阈值的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区； 从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区；
根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。
6、 如权利要求 1 ~ 5任一所述的方法， 其特征在于， 所述网络侧设备确定同步小区之 后， 还包括：
所述网络侧设备将确定的同步小区的标识通过广播或专用信令通知所述用户设备。
7、 如权利要求 6所述的方法， 其特征在于， 所述专用信令是无线资源控制 RRC信令或 媒体接入控制 MAC信令或物理层控制信道 PDCCH信令。
8、 如权利要求 7所述的方法， 其特征在于， 所述同步小区的标识是中心频点和小区物 理标识 PCI,或演进的通用移动通信系统陆地无线接入网小区全球标识 ECGI,或小区编号。
9、 如权利要求 1 ~ 5任一所述的方法， 其特征在于， 所述同步小区配置基于系统配置 或基于用户设备配置。
10、 如权利要求 1 ~ 5任一所述的方法， 其特征在于， 还包括如下之一或组合： 所述扩展载波与同步小区下行同步；
所述扩展载波和所述同步小区使用相同的路损参考；
所述扩展载波的移动性测量结果与所述同步载波使用相同值；
所述同步小区被去激活后， 所述扩展载波也被去激活；
所述扩展载波由所述同步小区调度， 或通过扩展载波的增强的物理层控制信道 E-PDCCH调度或通过网络侧配置的其它小区调度；
所述扩展载波和所述同步小区分别具有独立的小区编号；
所述扩展载波所在小区与所述同步小区属于相同定时提前 TA组时，所述扩展载波所在 小区与所述同步小区所使用用于上行传输的下行定时参考小区相同， 且使用相同的上行定 时提前量；
所述扩展载波所在小区与所述同步小区属于不同 TA组时，所述扩展载波所在小区与所 述同步小区所使用的用于上行传输的下行定时参考小区不同。
11、 一种确定同步小区的方法， 其特征在于， 该方法包括：
用户设备确定网络侧设备需要为所述用户设备配置的扩展载波；
所述用户设备在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同步小 区。
12、 如权利要求 11所述的方法， 其特征在于， 所述用户设备确定同步小区之前， 还包 括：
所述用户设备向网络侧上 4艮所述用户设备的能力信息。
13、 如权利要求 12所述的方法， 其特征在于， 所述能力信息包含如下部分或者全部信 息：
用户设备支持的协议版本；
用户设备是否支持扩展载波的能力指示；
用户设备支持的扩展载波类型指示。
14、 如权利要求 11~13任一所述的方法， 其特征在于， 所述用户设备釆用下列方式中 的一种确定同步小区：
选择主小区 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区；
根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。
15、 如权利要求 11~13任一所述的方法， 其特征在于， 所述用户设备确定同步小区包 括：
所述用户设备将通过广播或专用信令接收的同步小区的标识对应的小区作为同步小 区。
16、 如权利要求 11~13任一所述的方法， 其特征在于， 还包括如下之一或组合： 所述扩展载波与同步小区下行同步；
所述扩展载波和所述同步小区使用相同的路损参考；
所述扩展载波的移动性测量结果与所述同步载波使用相同值；
所述同步小区被去激活后， 所述扩展载波也被去激活；
所述扩展载波由所述同步小区调度， 或通过扩展载波的增强的物理层控制信道 E-PDCCH调度或通过网络侧配置的其它小区调度；
所述扩展载波和所述同步小区分别具有独立的小区编号；
所述扩展载波所在小区与所述同步小区属于相同定时提前 TA组时，所述扩展载波所在 小区与所述同步小区所使用用于上行传输的下行定时参考小区相同， 且使用相同的上行定 时提前量；
所述扩展载波所在小区与所述同步小区属于不同 TA组时，所述扩展载波所在小区与所 述同步小区所使用的用于上行传输的下行定时参考小区不同。
17、 一种确定同步小区的网络侧设备， 其特征在于， 该网络侧设备包括： 第一确定模块， 用于确定需要为用户设备配置的扩展载波；
第一处理模块， 用于在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同 步小区。
18、 如权利要求 17所述的网络侧设备， 其特征在于， 所述第一处理模块具体用于： 确定所述用户设备支持同步扩展载波之后 , 确定所述扩展载波的同步小区。
19、 如权利要求 18所述的网络侧设备， 其特征在于， 所述第一处理模块具体用于： 根据所述用户设备上报的能力信息，确定所述用户设备是否支持扩展载波和 /或支持的 扩展载波类型。
20、 如权利要求 17所述的网络侧设备， 其特征在于， 所述第一处理模块釆用下列方式 中的一种确定同步小区：
选择主小区 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波同覆盖的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波属于同一个频带或者与扩展载波中心频点的频域间隔不大于阈值的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损相同的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择一个与扩展 载波的路损的差值不大于阈值的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区；
根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。
21、 如权利要求 17 - 20任一所述的网络侧设备， 其特征在于， 所述第一处理模块还用 于：
将确定的同步小区的标识通过广播或专用信令通知所述用户设备。
22、 一种确定同步小区的用户设备， 其特征在于， 该用户设备包括： 第二确定模块， 用于确定网络侧设备需要为所述用户设备配置的扩展载波； 第二处理模块， 用于在确定所述扩展载波为同步扩展载波后， 确定所述扩展载波的同 步小区。
23、 如权利要求 22所述的用户设备， 其特征在于， 所述第二处理模块还用于： 确定同步小区之前， 向网络侧上报所述用户设备的能力信息。
24、 如权利要求 23所述的用户设备， 其特征在于， 所述能力信息包含如下部分或者全 部信息：
用户设备支持的协议版本；
用户设备是否支持扩展载波的能力指示；
用户设备支持的扩展载波类型指示。
25、 如权利要求 23或 24所述的用户设备， 其特征在于， 所述第二处理模块釆用下列方 式中的一种确定同步小区：
选择主小区 PCell为同步小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 大的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区编号最 小的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点低的小区；
从网络侧为用户设备配置或配置且激活的 LTE系统后向兼容的小区中选择小区的中心 频点与扩展载波的中心频点最接近且比扩展载波中心频点高的小区；
根据网络侧配置的跨载波调度关系确定调度扩展载波的小区为同步小区。
26、 如权利要求 23或 24所述的用户设备， 其特征在于， 所述第二处理模块具体用于： 将通过广播或专用信令接收的同步小区的标识对应的小区作为同步小区。
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