WO2010025604A1 - 基站内载波切换方法和系统 - Google Patents

基站内载波切换方法和系统 Download PDF

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Publication number
WO2010025604A1
WO2010025604A1 PCT/CN2008/073650 CN2008073650W WO2010025604A1 WO 2010025604 A1 WO2010025604 A1 WO 2010025604A1 CN 2008073650 W CN2008073650 W CN 2008073650W WO 2010025604 A1 WO2010025604 A1 WO 2010025604A1
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WO
WIPO (PCT)
Prior art keywords
carrier
mobile station
base station
predetermined
target
Prior art date
Application number
PCT/CN2008/073650
Other languages
English (en)
French (fr)
Inventor
张瑞霞
王文焕
刘敏
吕开颖
李楠
方惠英
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/061,778 priority Critical patent/US8520635B2/en
Priority to EP08876873.4A priority patent/EP2326124B1/en
Publication of WO2010025604A1 publication Critical patent/WO2010025604A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/06Reselecting a communication resource in the serving access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/30Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837Determination of triggering parameters for hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/30Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • an 802.16m system is an evolved system of an 802.16e system, and is a multi-carrier system based on Orthogonal Frequency Division Multiplex Access (OFDMA) technology.
  • OFDMA Orthogonal Frequency Division Multiplex Access
  • the architecture of a multi-carrier system is shown in Figure 1.
  • a single media access control entity (MAC) controls a physical layer (Physical, abbreviated as PHY) including multiple channels, for example, including channel 1, channel 2, ... channel N in the PHY.
  • Each channel may have a different bandwidth, for example, channel 1 has a bandwidth of 5 MHz, channel 2 has a bandwidth of 10 MHz, and channel N has a bandwidth of 20 MHz, and the bandwidth of the above channel belongs to a continuous or discontinuous frequency band.
  • carriers in a multi-carrier system eg, an 802.16m system
  • the primary carrier is a carrier used for interactive services and all PHY/MAC control information between a base station (BS) and a mobile station (MS).
  • the primary carrier is also used to control the operation of the MS, such as network access.
  • BS base station
  • MS mobile station
  • the primary carrier is also used to control the operation of the MS, such as network access.
  • the secondary carrier is an additional carrier used to transmit traffic for the MS, which is received on the primary carrier by BS-specific commands and rules.
  • the secondary carrier may also include some control signaling that supports multi-carrier operation.
  • each MS may have one or more secondary carriers or no secondary carriers.
  • the MS can obtain partial information of the secondary carrier through the primary carrier, for example, whether there is a secondary carrier, a location and configuration information of the secondary carrier, and the like.
  • carriers in a multi-carrier system may have different configurations, for example, a fully configured carrier and a partially configured carrier.
  • the fully configured carrier refers to carriers configured with all control channels, including synchronization, broadcast, multicast, and unicast control signaling channels, and also includes information and parameters related to multi-carrier operation and other carriers.
  • a partially configured carrier refers to a carrier that contains only the basic control channel configuration used to support traffic interactions in multi-carrier operation.
  • the primary carrier must be a fully configured carrier, and the secondary carrier can be a fully configured carrier or a partially configured carrier, depending on the usage and configuration model.
  • users in one base station can be divided into a cell center user and a cell edge user. As shown in FIG.
  • ⁇ 201 mobile station 1, mobile station 2
  • ⁇ Mobile station 5 For the cell center user, the users (mobile station 6, mobile station 7, mobile station 8) within the range of ⁇ 202 are cell edge users.
  • ⁇ 201, 202 are only used. An example is to distinguish between two types of users.
  • the division between the cell center user and the cell edge user depends on the actual situation of the base station.
  • QoS quality of the service
  • the MS terminates the connection with the current serving base station and switches to other neighboring base stations to obtain better QoS.
  • the process is inter-BS handover.
  • the carrier where the user is located may be overloaded, while the other carriers of the monthly BS may be lightly loaded, and the carrier of the user may be switched.
  • the system is load balanced.
  • different carriers for non-contiguous bands may experience varying degrees of fading.
  • the quality of the carrier channel where the user is located is deteriorated, and the carrier of the user can also be switched to the other carrier with good channel quality of the service BS, so as to better meet the QoS requirement of the user.
  • the above process is called intra-base station carrier switching. -BS carrier handover ).
  • the 802.16e system is a single-carrier system.
  • the inter-base station handover process mainly includes the process of cell reselection, handover decision and initiation, network re-access, and MS termination on the serving BS.
  • Inter-base station handover has a certain handover interruption delay from the handover initiation to the successful re-access target BS.
  • the 802.16m system is a multi-carrier system, and there will be inter-base station handover and intra-base station carrier switching.
  • the handover interruption delay may cause service discontinuity and seamless handover is impossible.
  • the main object of the present invention is to provide an improved intra-base station carrier switching scheme. To solve the above problems in the related art.
  • a carrier switching method in a base station for switching a carrier in a base station in a multi-carrier system.
  • the intra-base station carrier switching method according to the present invention includes: the mobile station scans a predetermined carrier in the base station by a predetermined rule, acquires a scan report including channel quality information of part or all of the predetermined carriers, and transmits the scan report to the base station; the base station acquires the scan report Channel quality information, selecting a target carrier from a predetermined carrier, and notifying the selected target carrier to the mobile station by using a message; in response to the message, the mobile station switches to the target carrier in a predetermined manner.
  • the method further includes: the mobile station acquires, by using the primary carrier thereof, configuration information of the other carriers except the current primary carrier configured in the base station, and broadcast information related to the multi-carrier operation, and according to the configuration information.
  • the broadcast information related to the multi-carrier operation acquires multi-carrier scan related information.
  • the predetermined rule includes at least one of the following: the mobile station periodically scans the predetermined carrier according to the multi-carrier scanning related information; the mobile station scans the predetermined carrier in an event-triggered manner according to the multi-carrier scanning related information; The mobile station receives the notification message sent by the base station, and scans the predetermined carrier according to the scan information carried in the notification message, where the scan information includes at least one of the following: a list of scan carriers to be scanned, a scan start time, and a scan interval.
  • the base station selects the target carrier, the base station selects the target carrier according to the carrier load condition and the channel quality information acquired by the base station, and if the source carrier of the mobile station is the primary carrier of the mobile station, the target carrier is a fully configured carrier, if The source carrier is a secondary carrier of the mobile station, and the target carrier is a fully configured carrier or a partially configured carrier.
  • the message is a carrier handover notification message.
  • the carrier switching notification message carries the source carrier information of the mobile station and the indication information of whether synchronization is performed on the target carrier; and, if the target carrier and the source carrier satisfy the predetermined condition, the carrier switching notification further carries There are at least one of the following: Dedicated 3 macro code, dedicated measurement resource information on the target carrier.
  • the predetermined condition is: a center frequency difference between the target carrier and the source carrier is greater than a predetermined frequency difference
  • the method further includes: the base station saves a mapping relationship between the mobile station identifier, the dedicated ranging code, and the dedicated ranging resource.
  • the mobile station switches to the target carrier in a predetermined manner, including: in response to the carrier handover notification message, the mobile station performs dedicated ranging on the target carrier.
  • the dedicated ranging code is transmitted on the resource; the mobile station receives the ranging response message sent by the base station according to the mapping relationship on its primary carrier, and switches from the source carrier to the target carrier in a predetermined manner.
  • the predetermined manner includes: before the predetermined time arrives, the mobile station maintains a connection with the base station on the current primary carrier; when the predetermined time arrives, the mobile station switches to The target carrier, and the obtained control information is parsed on the target carrier, and the target carrier is used as the primary carrier of the mobile station.
  • the predetermined manner includes: the mobile station receives, by the source carrier, a notification that the base station allocates resources on the target carrier for the mobile station; the mobile station transmits the notification of the resource according to the target.
  • the predetermined manner includes: the mobile station receiving, by the primary carrier, a notification that the base station allocates resources on the target carrier for the mobile station; in response to the notification of the allocated resource, the mobile station terminates The source carrier is connected and switched to the target carrier to receive or transmit data at the indicated location of the target carrier.
  • the predetermined carrier comprises: a fully configured carrier and a partially configured carrier supported by the mobile station except the primary carrier and the secondary carrier of the mobile station configured by the base station.
  • an intra-base station carrier switching system for switching a carrier within a base station in a multi-carrier system.
  • the intra-base station carrier switching system includes: a mobile station, configured to scan a predetermined carrier in a base station by a predetermined rule, acquire a scan report including channel quality information of part or all of the predetermined carriers, and send the scan report to the base station; And acquiring channel quality information in the scan report, selecting a target carrier from the predetermined carrier, and notifying the selected target carrier to the mobile station by using a carrier switching notification message; the mobile station is further configured to use the predetermined message of the base station, Switch to the target carrier in a predetermined manner.
  • the predetermined carrier includes: a fully configured carrier and a partially configured carrier supported by the mobile station except the primary carrier and the secondary carrier of the mobile station configured by the base station; and/or a primary carrier in which the source carrier is the mobile station
  • the predetermined method includes: setting a handover time in advance, and before the handover time arrives, the mobile station maintains a connection with the base station on the current primary carrier; when the handover time arrives, the mobile station switches to the target carrier and parses on the target carrier.
  • the mobile station receives, by the source carrier, a notification that the base station allocates resources on the target carrier for the mobile station; the mobile station notifies the target carrier according to the allocation of the resource Instructing the location to receive or transmit data; when the next superframe arrives, the mobile station parses the control information acquired from the target carrier, and uses the target carrier as the primary carrier of the mobile station; or, when the source carrier is the secondary carrier of the mobile station
  • the predetermined manner includes: the mobile station receiving, by the primary carrier, a notification that the base station allocates resources on the target carrier for the mobile station; in response to the notification of the allocated resource, the mobile station terminates the connection with the source carrier, and switches to the target carrier, where the target carrier The indicated location receives or sends data.
  • the carrier switching scheme in the base station of the present invention solves the problem that the handover interruption delay in the related art can not ensure the continuity of the mobile station service, so that the mobile station can perform the base in the multi-carrier system.
  • the seamless switching between carriers in the station ensures the continuity of the mobile station service, and thus the delay of carrier switching can be eliminated.
  • FIG. 2 is a schematic diagram of a cell user classification in a base station in the related art
  • FIG. 3 is a flowchart of a method for switching a carrier in a base station according to an embodiment of the present invention
  • 4 is a flowchart of Example 1 of a method for carrier switching in a base station according to an embodiment of the present invention
  • FIG. 5 is a flowchart of Example 2 of a method for carrier switching in a base station according to an embodiment of the present invention
  • FIG. 6 is a flowchart according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of Example 4 of a carrier switching method in a base station according to an embodiment of the present invention
  • FIG. 3 is a flowchart of Example 1 of a method for carrier switching in a base station according to an embodiment of the present invention
  • FIG. 5 is a flowchart of Example 2 of a method for carrier switching in a base station according to
  • FIG. 8 is a flowchart of Example 5 of a method for carrier switching in a base station according to an embodiment of the present invention
  • FIG. 9 is a flowchart according to an embodiment of the present invention.
  • FIG. 10 is a block diagram of a base station internal carrier switching system according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a carrier switching scheme in a base station, because there is a problem that the handover interruption delay occurs when the mobile station performs carrier switching in the base station, thereby failing to ensure the continuity of the mobile station service.
  • the method for implementing the carrier switching in the base station by the MS mainly includes four steps: 1. scanning other carriers in the BS, 2. selecting a target carrier, 3. synchronizing on the target carrier, 4. achieving a target Carrier switching.
  • target carrier switching There are two cases of target carrier switching: primary carrier switching and secondary carrier switching, and the primary carrier is switched using the two predetermined methods of the present invention.
  • a carrier switching method in a base station for switching a carrier in a base station in a multi-carrier system.
  • the MS acquires configuration information of other carriers except the current primary carrier and broadcast information related to multi-carrier operation configured in the base station by using the primary carrier, and acquires multi-carrier scanning related information according to the configuration information and the broadcast information related to the multi-carrier operation.
  • the following processing is performed as shown in FIG. 3 (steps S302 - S306).
  • FIG. 3 is a flowchart of the method for switching carriers in the base station according to the embodiment of the present invention: S302.
  • the MS scans a predetermined carrier in the BS by using a predetermined rule, and obtains a part or all
  • the scanning report of the channel quality information of the predetermined carrier is sent to the BS, where the predetermined carrier is: the fully configured carrier and the partially configured carrier supported by the MS except the primary carrier and the secondary carrier configured by the BS.
  • the predetermined rule in step S302 may include, but is not limited to, one of the following: 1.
  • the MS periodically scans the predetermined carrier according to the multi-carrier scanning related information; 2.
  • the MS triggers the event according to the multi-carrier scanning related information.
  • the method scans the predetermined carrier, for example, sets a predetermined threshold, and the MS determines that a certain information exceeds the set predetermined threshold, triggers a scan event; 3.
  • the MS receives the notification message sent by the BS, and then sends the notification message to the notification message.
  • the carried scan information scans a predetermined carrier, where the scan information may include a list of scan carriers to be scanned, a scan start time, a scan interval, and the like.
  • the BS acquires channel quality information in the scan report, selects a target carrier from the predetermined carrier, and notifies the selected target carrier to the MS by using a predetermined message.
  • the predetermined message herein may be a carrier handover notification message.
  • the carrier switching notification message may further carry source carrier information of the MS and indication information of whether synchronization is performed on the target carrier, where the target carrier and the source carrier satisfy the following predetermined conditions.
  • the BS carries the dedicated measurement macro code and the dedicated measurement giant resource information on the target carrier in the carrier switching notification.
  • the BS may select the target carrier of the MS according to the following principle: 1. # ⁇ The BS selects the target carrier based on the carrier load condition and channel quality information acquired before the target carrier is selected. 2. In the case that the source carrier of the MS is the primary carrier of the MS, the target carrier is the fully configured carrier; 3. The source carrier is the MS. In the case of the secondary carrier, the target carrier is a fully configured carrier or a partially configured carrier, wherein the source carrier includes a primary carrier and a secondary carrier of the mobile station.
  • the above predetermined condition may be set as follows: The center frequency difference between the target carrier and the source carrier is greater than the predetermined frequency difference A f .
  • the MS and the BS do not need to synchronize.
  • the BS further carries the dedicated ranging code and the dedicated ranging resource information on the target carrier in the carrier switching notification.
  • the BS also stores a mapping relationship between the MS identifier, the dedicated ranging code, and the dedicated ranging resource.
  • step S304 if the MS meets the predetermined condition described above, and the MS needs to synchronize with the BS on the target carrier, the MS transmits a dedicated ranging code on the dedicated 3 macro resource of the target carrier, and sends a dedicated measurement. After the code is received, the target carrier is not required to wait for the response message, but the ranging response message sent by the BS is received on the primary carrier. It should be noted that the BS sends the measurement to the MS according to the previously saved mapping relationship: . Step S306, the MS responds to receive the ranging response message from its primary carrier and switches from the source carrier to the target carrier in a predetermined manner.
  • the predetermined mode (that is, the switching mode 1) is specifically: 1. Before the predetermined time arrives, the MS maintains the connection with the BS on the current primary carrier; When the predetermined time arrives, the MS switches to the target carrier, and parses the acquired control information on the target carrier, and uses the target carrier as the primary carrier of the MS. 2.
  • the predetermined mode (that is, the switching mode 2) is specifically as follows: 1. The MS receives the notification that the MS allocates resources on the target carrier by the source carrier;
  • the MS receives or transmits data according to the notification of the allocated resource at the indicated location of the target carrier. 3.
  • the MS parses the control information acquired from the target carrier, and uses the target carrier as the primary carrier of the MS.
  • the predetermined mode is specifically: MS pass
  • the over-subcarrier connection BS is a notification that the MS allocates resources on the target carrier; in response to the notification of the allocated resources, the MS terminates the connection with the source carrier, and switches to the target carrier to receive or transmit data at the indicated location of the target carrier.
  • Example 1 The single-channel MS carrier performs the intra-BS primary carrier switching in the handover mode.
  • FIG. 4 shows a single channel MS and a serving BS, where the serving BS has four carriers, and the full configuration carrier 1 is partially configured.
  • the primary carrier of the MS is the fully configured carrier 1, and the secondary carrier is the partially configured carrier 2.
  • the process of performing the intra-BS primary carrier switching in the switching mode of the single-channel MS carrier includes the following processing: Step 1: The MS scans the other carriers of the BS in the scanning interval (that is, the foregoing predetermined carrier, in this embodiment, the predetermined carrier is the carrier 3 And carrier 4), and send a scan (corresponding to step S302 in Fig. 3).
  • Step 3 The MS sends a special measurement macro code at the time-frequency position on the indicated fully configured carrier 3.
  • Step 4 The MS receives the ranging response message on the fully configured carrier 1.
  • the MS and the BS complete the uplink synchronization on the fully configured carrier 3.
  • Step 5 The MS maintains the connection on the fully configured carrier 1 until the end of the superframe.
  • Step 6 At the beginning of the next superframe, the RF of the MS is adjusted to the fully configured carrier 3, the necessary control information (such as resource assignment information) is parsed, and the service BS and the control information are exchanged, and the full configuration carrier 3 becomes the MS new.
  • the primary carrier (step 3 - step 6 corresponds to step S306 in Fig. 3).
  • step S306 in Fig. 3 Through the above processing, the primary carrier switching of the single channel MS carrier in the BS is realized.
  • Example 2 Performing intra-BS carrier switching in the mode 2 of the single-channel MS carrier.
  • FIG. 5 is a flowchart of the second example of the method for switching the carrier in the base station according to the embodiment of the present invention. As shown in FIG.
  • Step 1 The MS scans the BS other carriers (i.e., the predetermined carrier described above, in the present embodiment, the predetermined carrier is carrier 3 and carrier 4), and transmits a scan report (corresponding to step S302 in FIG. 3).
  • Step 3 The MS sends a special measurement macro code at the time-frequency position on the indicated fully configured carrier 3.
  • Step 4 The MS receives the ranging response message on the fully configured carrier 1, and the MS and the BS complete the uplink synchronization on the fully configured carrier 3.
  • Step 5 The BS allocates resources to the MS on the fully configured carrier 3, and sends the resource assignment information to the MS through the fully configured carrier 1.
  • the MS terminates the connection of the fully configured carrier 1, and the RF adjusts to the fully configured carrier 3, and transmits and receives data at the indicated location.
  • Step 7 At the beginning of the next superframe, the MS obtains necessary control information (such as resource assignment information) for the fully configured carrier 3, and interacts with the BS and control information.
  • necessary control information such as resource assignment information
  • FIG. 6 is a flowchart of the third example of the carrier switching method in the base station according to the embodiment of the present invention. As shown in FIG. 6, the following processing is included: Step 1.
  • the MS scans the BS other carriers (i.e., the predetermined carrier described above, in the present embodiment, the predetermined carrier is carrier 3 and carrier 4), and sends a scan report (corresponding to step S302 in FIG. 3).
  • the BS is synchronized on the target carrier (corresponding to step S304 in Fig. 3).
  • Step 3 The BS allocates resources to the MS on the fully configured carrier 3, and sends the resource assignment information to the MS through the fully configured carrier 1.
  • Step 4 The MS terminates the connection with the partially configured carrier 2, adjusts to the fully configured carrier 3, and transmits and receives data at the indicated location (step 3, step 4 corresponds to step S306 in FIG. 3).
  • Example 4 Multi-channel MS carrier performs primary carrier switching in a base station in a handover mode.
  • FIG. 7 is a flowchart of Example 4 of a method for carrier switching in a base station according to an embodiment of the present invention, and FIG. 7 shows a multi-channel MS and a serving BS.
  • the MS has two channels, namely RF#1 and RF#2, and the service BS has four carriers, all configured carrier 1, partially configured carrier 2, fully configured carrier 3, and fully configured carrier 4.
  • the primary carrier of the MS is the fully configured carrier 1, located at RF#1.
  • the secondary carrier of the MS is the fully configured carrier 2, located at RF#2.
  • the multi-channel MS carrier performs handover of the primary carrier in the base station in the handover mode.
  • the following processing is performed: Step 1.
  • the MS scans the other carriers of the BS at the scanning interval using RF#2 (ie, the predetermined carrier, in the embodiment, the predetermined carrier. It is carrier 3 and carrier 4), and a scan report is transmitted (corresponding to step S302 in Fig. 3).
  • step 3 the MS transmits a dedicated ranging code on the indicated time-frequency position on the fully configured carrier 3 using RF#1.
  • step 4 The MS receives the ranging response message on the fully configured carrier 1.
  • MS and BS in full configuration Uplink synchronization is completed on carrier 3.
  • Step 5 the MS keeps the connection with the BS in RF#1 (full configuration carrier 1) until the end of the superframe.
  • Step 6 At the beginning of the next superframe, the RF#1 of the MS is adjusted to the fully configured carrier 3, and the necessary control information (for example: resource assignment information) is parsed, and the BS exchanges service control information.
  • the fully configured carrier 3 becomes the MS's new primary carrier, located at RF #1 (step 3 - step 6 corresponds to step S306 in FIG. 3).
  • FIG. 8 is a flowchart of the fifth example of the method for switching the carrier in the base station according to the embodiment of the present invention. As shown in FIG. 8, the following processing is included: 1.
  • the MS scans the BS other carriers (ie, the above-mentioned predetermined carriers, in the present embodiment, the predetermined carriers are carrier 3 and carrier 4) in the scanning interval using RF#2, and sends a scan report (corresponding to the steps in FIG. 3). S302).
  • Step 3 The MS sends a dedicated ranging code on the indicated time-frequency position on the fully configured carrier 3 using RF#1.
  • Step 4 The MS receives the ranging response message on the fully configured carrier 1, and the MS and the BS complete the uplink synchronization on the fully configured carrier 3.
  • Step 5 The BS allocates resources to the MS on the fully configured carrier 3, and sends the resource assignment information to the MS through the fully configured carrier 1.
  • the RF#1 of the MS terminates the connection of the fully configured carrier 1, adjusts to the fully configured carrier 3, and transmits and receives data at the indicated location.
  • Step 7 starting with the next superframe, the MS parses the necessary control information (such as resource assignment information) on the fully configured carrier 3, and interacts with the BS and the control information.
  • the fully configured carrier 3 becomes the MS's new primary carrier, located in the RF. #1 (Step 3 - Step 7 corresponds to step S306 in Fig. 3).
  • the multi-channel MS carrier is switched in the handover mode 2 to perform the handover of the primary carrier in the base station.
  • FIG. 9 is a flowchart of a sixth example of a carrier switching method in a base station according to an embodiment of the present invention. As shown in FIG. 9, the following processing is included: Step 1: MS uses RF#2 The other carriers of the BS are scanned at the scanning interval (i.e., the predetermined carrier described above, in the present embodiment, the predetermined carrier is carrier 3 and carrier 4), and the transmission of the scan report corresponds to step S302 in FIG.
  • the scanning interval i.e., the predetermined carrier described above, in the present embodiment, the predetermined carrier is carrier 3 and carrier 4
  • Step 3 The MS sends a dedicated ranging code on the indicated time-frequency position on the fully configured carrier 3 using RF#2.
  • Step 4 The MS receives the ranging response message on the fully configured carrier 1, and the MS and the BS complete the uplink synchronization on the fully configured carrier 3.
  • Step 5 The BS allocates resources to the MS on the fully configured carrier 3, and sends the resource assignment information to the MS through the fully configured carrier 1.
  • the RF#2 of the MS terminates the connection with the partially configured carrier 2, adjusts to the fully configured carrier 3, and transmits and receives data at the indicated location (step 3 - step 6 corresponds to step S306 in FIG. 3).
  • the mobile station 1 includes a mobile station 1 (a scanning module 10, a first acquiring module 12, a transmitting module 14, and a switching module 16) and a base station 2 ( The second obtaining module 20, the selecting module 22, the notifying module 24, and the saving module 26).
  • the mobile station 1 includes: a scanning module 10, configured to scan a predetermined carrier in the base station 2 by using a predetermined rule; the first acquiring module 12 is connected to the scanning module 10, and configured to acquire channel quality information including part or all of the predetermined carriers.
  • the sending module 14 is connected to the first obtaining module 12, and is configured to send the scan report acquired by the first obtaining module 12 to the base station 2, where the predetermined carrier is: the main carrier of the mobile station 1 configured by the base station 2 The fully configured carrier and the partially configured carrier supported by the mobile station 1 in addition to the secondary carrier.
  • the scanning mode of the scanning module 10 the present invention is not limited. Several examples of the scanning mode are given below.
  • the scanning module 10 can periodically scan the predetermined carrier according to the multi-carrier scanning related information; The module 10 can also scan the predetermined carrier in an event-triggered manner according to the multi-carrier scanning related information.
  • the scanning module 10 can also receive the notification message sent by the base station 2, and then scan the predetermined carrier with the scanning information carried in the notification message.
  • the base station 2 includes: a second acquiring module 20, configured to acquire channel quality information in the scan report; a selecting module 22, connected to the second obtaining module 20, configured to select a target carrier from the predetermined carrier; and the notification module 24, connected to the selection
  • the module 22 is configured to notify the mobile station 1 of the selected target carrier by using a carrier switching notification message
  • the saving module 26 is configured to save a mapping relationship between the mobile station 1 identifier, the dedicated measurement macro code, and the dedicated measurement resource.
  • the selection module 22 selects a target carrier according to the following principle: selecting a target carrier and channel quality information according to a carrier load condition acquired before the target carrier is selected, and in a case where the source carrier of the mobile station 1 is the primary carrier of the mobile station 1,
  • the target carrier is a fully configured carrier.
  • the target carrier is a fully configured carrier or a partially configured carrier.
  • the carrier switching notification message sent by the notification module 24 to the mobile station 1 may carry the source carrier information of the mobile station 1 and the indication information of whether synchronization is performed on the target carrier, where When the carrier and the source carrier satisfy the predetermined condition, the notification module 24 may further carry the dedicated ranging code and the dedicated ranging resource information on the target carrier in the carrier switching notification.
  • the foregoing predetermined condition may be set as follows: a center frequency difference between the target carrier and the source carrier is greater than a predetermined frequency difference A f . That is to say, in the case where the center frequency difference between the target carrier and the source carrier is smaller than the predetermined frequency difference, the mobile station 1 and the base station 2 do not need to synchronize.
  • the notification module 24 further carries the dedicated measurement macro code and the dedicated measurement giant resource information on the target carrier in the carrier switching notification.
  • the saving module 26 in the base station 2 also saves the mapping relationship between the mobile station 1 identifier, the dedicated ranging code, and the dedicated 3 macro resources. In case the predetermined condition is met and the base station 2 needs to be synchronized on the target carrier, the mobile station
  • the transmitting module 14 in 1 needs to send a dedicated ranging code on the dedicated ranging resource of the target carrier, and after transmitting the dedicated ranging code, does not need to wait for the response message on the target carrier, but receives the base station 2 on the primary carrier.
  • the handover module 16 of the mobile station 1 switches from the source carrier to the target carrier in a predetermined manner in response to receiving a ranging response message from its primary carrier.
  • the switching module 16 can switch in the following two ways. Switching mode one
  • the cut time is set in advance, and before the handover time arrives, the handover module 16 maintains the connection between the mobile station 1 and the base station 2 on the current primary carrier.
  • the handover module 16 causes the mobile station 1 to switch to the target carrier, and parses the acquired control information on the target carrier, and uses the target carrier as the primary carrier. Switch mode 2
  • the mobile station 1 receives, by the source carrier, a notification that the base station 2 allocates resources on the target carrier. 2. The mobile station 1 receives or transmits data at the indicated location of the target carrier according to the notification of the allocated resource.
  • the mobile station 1 resolves the control it acquires from the target carrier. Information, and the target carrier as the primary carrier.
  • the switching module 16 performs carrier switching in the following manner: 1. receiving, by the primary carrier, a notification that the base station 2 allocates resources on the target carrier; 2. responding to allocating resources The notification causes the mobile station 1 to terminate the connection with the source carrier, and switches to the target carrier to receive or transmit data at the indicated location of the target carrier.
  • the carrier switching scheme in the base station of the present invention solves the problem that the handover interruption delay in the related art can not ensure the continuity of the mobile station service, so that the mobile station can be more
  • the carrier system performs seamless handover between carriers in the base station, thereby ensuring continuity of the mobile station service, and thus eliminating the delay of carrier switching.
  • embodiments may be implemented in hardware, software, firmware, middleware, microcode, hardware description languages, or a combination thereof.
  • program code or code segments for performing the necessary tasks may be stored in a machine readable medium, such as a storage medium.
  • the (multiple) processor can perform the necessary tasks.
  • a code segment can represent any combination of processes, functions, subroutines, programs, routines, subroutines, modules, objects, packages, classes, or instructions, data structures, or programming languages.
  • a code segment is coupled to another code segment or hardware circuit by transmitting and/or receiving information, data, arguments, or stored content.
  • Information, arguments, parameters, data, etc. may be communicated, transmitted, or transmitted via any suitable means including memory sharing, messaging, token passing, network transmission, and the like.

Description

基站内载波切换方法和系统
技术领域 本发明涉及通信领域, 并且特别地, 涉及一种基站内载波切换方法和系 统。 背景技术 在相关技术中, 802.16m系统是 802.16e系统的演进系统, 是一种基于 正交频分多址接入 ( Orthogonal Frequency Division Multiplex Access , 简称为 OFDMA ) 技术的多载波系统。 多载波系统的架构如图 1 所示。 单一的媒体 接入控制实体 ( Media Access Control, 简称为 MAC )控制包括多个信道的物 理层 (Physical, 简称为 PHY ), 例如, 在 PHY中包括信道 1、 信道 2...信道 N。 每个信道可以有不同的带宽, 例如, 信道 1 的带宽为 5MHz、 信道 2的 带宽为 10MHz, 信道 N的带宽为 20MHz, 并且, 上述信道的带宽属于连续 的或不连续的频带。 目前, 多载波系统(例如, 802.16m系统)中的载波可以分为两类, 即, 主载波和辅载波。 其中, 主载波是指基站 (Base Station, 简称为 BS ) 和移 动台 ( Mobile Station , 简称为 MS ) 之间用于交互业务和全部 PHY/MAC控 制信息的载波。 此外, 主载波还用于控制 MS的操作, 例如, 网络接入等。 在一个小区中, 每个 MS只有一个主载波。 辅载波是通过 BS特定的命令和规则、 在主载波上接收的、 用于为 MS 传输业务的额外载波。 辅载波也可以包括一些支持多载波操作的控制信令。 在一个小区中, 每个 MS可以有一个或多个辅载波, 也可以没有辅载波。 MS 可以通主载波获得辅载波的部分信息, 例如, 是否存在辅载波、 辅载波的位 置和配置信息等。 在相关技术中, 多载波系统中的载波可以有不同的配置, 例如, 全配置 载波和部分配置载波。 其中, 全配置载波是指配置了所有控制信道的载波, 这些控制信道包括同步、 广播、 组播、 单播控制信令信道, 此外, 还包括与 多载波操作及其他载波相关的信息和参数的信道。 部分配置载波是指只包含 在多载波操作中用于支持业务交互的基本的控制信道配置的载波。 考虑到主 载波和辅载波的使用情况, 主载波必须为全配置载波, 而辅载波可以是全配 置载波, 也可以是部分配置载波, 这取决于使用和配置模型。 在通信系统中,一个基站内的用户可以分为小区中心用户和小区边缘用 户, 如图 2所示, 相对于基站 1而言, 在圏 201范围之内的用户 (移动台 1、 移动台 2 ··· ···移动台 5 ) 为小区中心用户, 在圏 202范围之内的用户 (移动 台 6、 移动台 7、 移动台 8 ) 为小区边缘用户, 当然, 圏 201、 202只是用以 示例性区分两种用户, 在实际应用中, 小区中心用户和小区边缘用户的划分 会才艮据基站的实际情况而定。 对于小区边缘用户,由于信道衰落,会导致服务质量( Quality of Service, 简称为 QoS ) 下降, MS会终止与当前服务基站的连接, 切换到相邻的其他 基站, 从而获得更好的 QoS , 上述过程为基站间切换 (inter-BS handover )。 对于 802.16m多载波系统的小区中心用户,随着业务量的增加和新业务 的引入, 用户所在的载波可能负载过重, 而月艮务 BS 的其他载波可能负载艮 轻, 用户的载波可以切换到服务 BS的其他载波上, 使系统负载均衡。 另外, 对于非连续频带的不同载波可能会经历不同程度的衰落。 由于用户所在的载 波信道质量变差, 用户的载波也可以切换到 艮务 BS 的其他信道质量较好的 载波上, 从而更好的满足用户的 QoS 需求, 上述过程称为基站内载波切换 ( intra-BS carrier handover )。
802.16e 系统是单载波系统, 只存在基站间切换, 基站间切换过程主要 包括小区重选、 切换判决和发起、 网络重接入、 服务 BS上 MS的上下文终 止等过程。 基站间切换从切换发起到成功重接入目标 BS存在一定的切换中 断时延。
802.16m 系统是多载波系统, 会同时存在基站间切换和基站内载波切 换。 基站内载波切换时, 由于 MS服务于同一个 BS , 因此, 切换中断时延会 导致业务的不连续, 无法实现无缝切换。 发明内容 考虑到目前单载波系统的基站间切换方法存在切换中断时延无法保证 移动台业务连续性的问题而提出本发明, 为此, 本发明的主要目的在于提供 改进的基站内载波切换方案, 以解决相关技术中存在的上述问题。 为了实现上述目的, 才艮据本发明的一个方面, 提供了一种基站内载波切 换方法, 用于多载波系统中基站内载波的切换。 根据本发明的基站内载波切换方法包括:移动台以预定规则扫描基站内 的预定载波, 获取包含部分或全部预定载波的信道质量信息的扫描报告, 并 将扫描报告发送到基站; 基站获取扫描报告中的信道质量信息, 从预定载波 中选择目标载波, 并通过消息将选择的目标载波通知给移动台; 响应于消息, 移动台以预定方式切换到目标载波。 优选地, 移动台以预定规则扫描预定载波之前, 进一步包括: 移动台通 过其主载波获取基站中配置的除当前主载波外其他载波的配置信息以及多载 波操作相关的广播信息, 并根据配置信息和多载波操作相关的广播信息获取 多载波扫描相关信息。 优选地,预定规则包括以下至少之一:移动台根据多载波扫描相关信息, 周期性地对预定载波进行扫描; 移动台才艮据多载波扫描相关信息, 以事件触 发方式对预定载波进行扫描; 移动台接收基站发送的通知消息, 并根据通知 消息中携带的扫描信息对预定载波进行扫描, 其中, 扫描信息包括以下至少 之一: 需要扫描载波的列表、 扫描开始时间、 扫描间隔。 优选地,基站选择目标载波包括: 基站根据基站预先获取的载波负载状 况以及信道质量信息选择目标载波, 并且, 如果移动台的源载波为移动台的 主载波, 则目标载波为全配置载波, 如果源载波为移动台的辅载波, 则目标 载波为全配置载波或者部分配置载波。 优选地, 消息为载波切换通知消息。 优选地, 载波切换通知消息中携带有移动台的源载波信息、 以及是否在 目标载波上进行同步的指示信息; 并且, 在目标载波和源载波满足预定条件 的情况下, 载波切换通知中还携带有以下至少之一: 专用测 3巨码、 目标载波 上的专用测 巨资源信息。 优选地, 预定条件为: 目标载波与源载波的中心频率差大于预定频率差
△ f。 优选地, 在满足预定条件、 且基站发送了载波切换通知之后, 进一步包 括: 基站保存移动台标识、 专用测距码、 专用测距资源之间的映射关系。 优选地, 在载波切换通知消息中携带指示信息, 并且指示信息指示需要 同步的情况下, 移动台以预定方式切换到目标载波包括: 响应于载波切换通 知消息, 移动台在目标载波的专用测距资源上发送专用测距码; 移动台在其 主载波上接收基站才艮据映射关系发送的测距响应消息, 并以预定方式从源载 波切换到目标载波。 优选地, 在源载波为移动台的主载波的情况下, 预定方式包括: 在预定 时间到达前, 移动台保持与基站在当前主载波的连接; 在预定时间到达的情 况下, 移动台切换到目标载波, 并在目标载波上解析获取的控制信息, 并将 目标载波作为移动台的主载波。 优选地, 在源载波为移动台的主载波的情况下, 预定方式包括: 移动台 通过源载波接收基站为移动台在目标载波上分配资源的通知; 移动台才艮据分 配资源的通知在目标载波的指示位置接收或者发送数据; 在下一个超帧到来 时, 移动台解析其从目标载波获取的控制信息, 并将目标载波作为移动台的 主载波。 优选地, 在源载波为移动台的辅载波的情况下, 预定方式包括: 移动台 通过主载波接收基站为移动台在目标载波上分配资源的通知; 响应于分配资 源的通知, 移动台终止与源载波的连接, 并切换到目标载波, 在目标载波的 指示位置接收或者发送数据。 优选地, 预定载波包括: 基站配置的除移动台的主载波和辅载波之外移 动台支持的全配置载波和部分配置载波。 为了实现上述目的, 根据本发明的另一方面, 提供了一种基站内载波切 换系统, 用于多载波系统中基站内载波的切换。 根据本发明的基站内载波切换系统包括: 移动台, 用于以预定规则扫描 基站内的预定载波, 获取包含部分或全部预定载波的信道质量信息的扫描报 告, 并将扫描报告发送到基站; 基站, 用于获取扫描报告中的信道质量信息, 从预定载波中选择目标载波, 并通过载波切换通知消息将选择的目标载波通 知给移动台; 移动台, 进一步用于才艮据基站的预定消息, 以预定方式切换到 目标载波。 优选地, 预定载波包括: 基站配置的除移动台的主载波和辅载波之外移 动台支持的全配置载波和部分配置载波; 和 /或, 在源载波为移动台的主载波 的情况下, 预定方式包括: 预先设置切换时刻, 在切换时刻到达前, 移动台 保持与基站在当前主载波的连接; 在切换时刻到达时, 移动台切换到目标载 波, 并在目标载波上解析获取的控制信息, 并将目标载波作为移动台的主载 波; 或者, 移动台通过源载波接收基站为移动台在目标载波上分配资源的通 知; 移动台才艮据分配资源的通知在目标载波的指示位置接收或者发送数据; 在下一个超帧到来时, 移动台解析其从目标载波获取的控制信息, 并将目标 载波作为移动台的主载波; 或者, 在源载波为移动台的辅载波的情况下, 预 定方式包括: 移动台通过主载波接收基站为移动台在目标载波上分配资源的 通知; 响应于分配资源的通知, 移动台终止与源载波的连接, 并切换到目标 载波, 在目标载波的指示位置接收或者发送数据。 借助于本发明的技术方案, 通过本发明的基站内载波切换方案, 解决了 相关技术中存在切换中断时延从而无法保证移动台业务连续性的问题, 使得 移动台能够在多载波系统中进行基站内载波间的无缝切换, 从而保证了移动 台业务的连续性, 进而可以消除载波切换的时延。 本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结构来实 现和获得。 附图说明 附图用来提供对本发明的进一步理解, 并且构成说明书的一部分, 与本 发明的实施例一起用于解释本发明, 并不构成对本发明的限制。 在附图中: 图 1是相关技术中多载波系统的构架示意图; 图 2是相关技术中基站内小区用户分类的示意图; 图 3是根据本发明实施例的基站内载波切换方法的流程图; 图 4是根据本发明实施例的基站内载波切换方法的实例 1的流程图; 图 5是根据本发明实施例的基站内载波切换方法的实例 2的流程图; 图 6是根据本发明实施例的基站内载波切换方法的实例 3的流程图; 图 Ί是根据本发明实施例的基站内载波切换方法的实例 4的流程图; 图 8是根据本发明实施例的基站内载波切换方法的实例 5的流程图; 图 9是根据本发明实施例的基站内载波切换方法的实例 6的流程图; 图 10是根据本发明实施例的基站内载波切换系统的框图。 具体实施方式 功能相无述 目前, 由于在移动台进行基站内载波切换时, 存在切换中断时延从而无 法保证移动台业务连续性的问题, 因此, 本发明提供了一种基站内载波切换 方案, 在本发明的多载波系统中, MS 实现基站内载波切换的方法主要包括 四个步骤: 1、 扫描 BS内其他载波, 2、 选择目标载波, 3、 在目标载波上的 同步, 4、 实现目标载波的切换。 其中, 目标载波切换有两种情况: 主载波 切换和辅载波切换, 主载波使用本发明预定的两种方式进行切换。 以下结合附图对本发明的优选实施例进行说明, 应当理解, 此处所描述 的优选实施例仅用于说明和解释本发明, 并不用于限定本发明。 在以下的描述中, 为了解释的目的, 描述了多个特定的细节, 以提供对 本发明的透彻理解。 然而, 艮显然, 在没有这些特定细节的情况下, 也可以 实现本发明, 此外, 在不背离所附权利要求阐明的精神和范围的情况下, 下 述实施例以及实施例中得各个细节可以进行各种组合。 方法实施例 根据本发明的实施例, 提供了一种基站内载波切换方法, 用于多载波系 统中基站内载波的切换。 优选地, MS通过其主载波获取基站中配置的除当前主载波外其他载波 的配置信息以及多载波操作相关的广播信息, 并根据配置信息和多载波操作 相关的广播信息获取多载波扫描相关信息。 在获取多载波扫描相关信息后, 进行到如图 3所示的如下处理(步骤 S302 -步骤 S306 ), 其中, 图 3是才艮据 本发明实施例的基站内载波切换方法的流程图: 步骤 S302 , MS以预定规则扫描 BS内的预定载波, 获取包含部分或全 部预定载波的信道质量信息的扫描报告, 并将扫描报告发送到 BS , 其中, 上 述预定载波为: BS配置的除 MS的主载波和辅载波之外 MS支持的全配置载 波和部分配置载波。 在步骤 S302中的预定规则可以包括但不限于以下之一: 1、 MS根据多 载波扫描相关信息, 周期性地对预定载波进行扫描; 2、 MS才艮据多载波扫描 相关信息, 以事件触发方式对预定载波进行扫描, 例如, 设置预定门限值, MS判断某个信息超过设置的预定门限值, 则触发扫描事件; 3、 MS接收 BS 发送的通知消息, 并才艮据通知消息中携带的扫描信息对预定载波进行扫描, 其中, 扫描信息可以包括需要扫描载波的列表、 扫描开始时间、 扫描间隔等 信息。 步骤 S304, BS获取扫描报告中的信道质量信息, 从预定载波中选择目 标载波, 并通过预定消息将选择的目标载波通知给 MS , 例如, 这里的预定 消息可以是载波切换通知消息。 如下表 1所示, 该载波切换通知消息中还可 以进一步携带有 MS的源载波信息以及是否在目标载波上进行同步的指示信 息, 其中, 在目标载波和源载波满足下述的预定条件的情况下, BS在载波切 换通知中携带专用测 巨码、 目标载波上的专用测 巨资源信息。
Figure imgf000009_0001
关于选择目标栽波的原则 在步骤 S304中, BS可以 #居下述原则选择 MS的目标载波: 1、 #居 BS 在选择目标载波之前预先获取的载波负载状况以及信道质量信息选择目 标载波; 2、 在 MS的源载波为 MS的主载波的情况下, 目标载波为全配置载 波; 3、 在源载波为 MS的辅载波的情况下, 目标载波为全配置载波或者部分 配置载波, 其中, 源载波包括移动站的主载波和辅载波。 关于预定条件 作为一种实现方式, 上述预定条件可以如下设置: 目标载波与源载波的 中心频率差大于预定频率差 A f。 也就是说, 在目标载波与源载波的中心频率 差小于预定频率差 的情况下, MS和 BS则不需要同步。 在目标载波与源 载波的中心频率差大于预定频率差 的情况下, BS在载波切换通知中进一 步携带专用测距码以及目标载波上的专用测距资源信息。优选地, BS还会保 存 MS标识、 专用测距码、 专用测距资源之间的映射关系。 在步骤 S304之后, 如果符合上述的预定条件, 则 MS需要与 BS在目 标载波上进行同步的情况下, MS 在目标载波的专用测 3巨资源上发送专用测 距码, 并且, 在发送专用测距码后, 不需要在目标载波等待响应消息, 而是 在主载波上接收 BS发送的测距响应消息, 需要说明的是, BS是根据之前保 存的映射关系向 MS发送测: ί巨响应消息。 步骤 S306, MS响应于从其主载波上接收测距响应消息, 并以预定方式 从源载波切换到目标载波。 关于预定方式 一、 在上述源载波为 MS的主载波的情况下, 预定方式(也就是切换方 式一)具体为: 1、 在预定时间到达前, MS保持与 BS在当前主载波的连接; 2、 在预定时间到达的情况下, MS切换到目标载波, 并在目标载波上解析获 取的控制信息, 并将目标载波作为 MS的主载波。 二、在源载波为 MS的主载波的情况下,预定方式(也就是切换方式二) 具体为: 1、 MS通过源载波接收 BS为 MS在目标载波上分配资源的通知; 2、
MS根据分配资源的通知在目标载波的指示位置接收或者发送数据; 3、 在下 一个超帧开始的情况下, MS 解析其从目标载波获取的控制信息, 并将目标 载波作为 MS的主载波。 三、 在上述源载波为 MS的辅载波的情况下, 预定方式具体为: MS通 过主载波接》 BS为 MS在目标载波上分配资源的通知; 响应于分配资源的 通知, MS 终止与源载波的连接, 并切换到目标载波, 在目标载波的指示位 置接收或者发送数据。 需要说明的是, 多载波系统中的 MS才艮据射频(Radio Frequency, 简称 为 RF ) 的数目不同可以分为单通道 MS ( single-radio MS ) 和多通道 MS ( multi-radio MS ) , 才艮据不同类型的 MS和不同的载波切换情况及方式, 本 发明实施例给出了以下几个实例。 实例 1 : 单通道 MS载波在切换方式一下进行 BS内主载波切换。 图 4是根据本发明实施例的基站内载波切换方法的实例 1的流程图,图 4中示出了单通道 MS和服务 BS , 其中, 服务 BS有四个载波, 全配置载波 1、 部分配置载波 2、 全配置载波 3和全配置载波 4。 MS的主载波是全配置 载波 1 , 辅载波是部分配置载波 2。 单通道 MS载波在切换方式一下进行 BS 内主载波切换的过程包括如下处理: 步骤 1 , MS在扫描间隔扫描 BS其他载波 (即, 上述的预定载波, 在 本实施例中, 预定载波为载波 3和载波 4 ), 并发送扫描 告 (对应于图 3中 的步骤 S302 )。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1 ( MS的 主载波) 上通知 MS , 同时发送全配置载波 1频率 ( MS主载波的信息)、 同 步指示 =1 ( 1表示 MS需要和服务 BS在目标载波上同步)、 专用测距码和在 全配置载波 3 ( MS 的目标载波) 上的专用测距资源 (对应于图 3 中的步骤 S304 )。 步骤 3 , MS在所指示的全配置载波 3上的时频位置发送专用测 巨码。 步骤 4, MS在全配置载波 1上接收测距响应消息。 MS和 BS在全配置 载波 3上完成上行同步。 步骤 5 , MS保持在全配置载波 1上的连接, 直到本超帧结束。 步骤 6, 在下一个超帧开始时, MS的 RF调整到全配置载波 3 , 解析必 要的控制信息(如资源指配信息), 和艮务 B S交互业务和控制信息, 全配置 载波 3成为 MS新的主载波 (步骤 3 -步骤 6对应于图 3中的步骤 S306 )。 通过上述的处理, 实现了单通道 MS载波在 BS内的主载波切换。 实例 2: 单通道 MS载波在切换方式二下进行 BS内载波切换 图 5是根据本发明实施例的基站内载波切换方法的实例 2的流程图,如 图 5所示, 包括以下处理: 步骤 1 , MS在扫描间隔扫描 BS其他载波 (即, 上述的预定载波, 在 本实施例中, 预定载波为载波 3和载波 4 ), 并发送扫描报告 (对应于图 3中 的步骤 S302 )。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1 ( MS的 主载波)上通知 MS , 同时发送全配置载波 1频率、 同步指示 =1 ( MS需要和 服务 BS在目标载波上同步)、 专用测距码和在全配置载波 3上的专用测距资 源 (对应于图 3中的步骤 S304 )。 步骤 3 , MS在所指示的全配置载波 3上的时频位置发送专用测 巨码。 步骤 4, MS在全配置载波 1上接收测距响应消息, MS和 BS在全配置 载波 3上完成上行同步。 步骤 5 , BS在全配置载波 3上为 MS分配资源, 通过全配置载波 1发 送资源指配信息给 MS。 步骤 6, MS终止全配置载波 1的连接, RF调整到全配置载波 3 , 在指 示的位置收发数据。 步骤 7,在下一个超帧开始, MS获得全配置载波 3必要的控制信息(如 资源指配信息), 和 BS交互业务和控制信息。 全配置载波 3成为 MS新的主 载波 (步骤 3 -步骤 7对应于图 3中的步骤 S306 )。 通过上述处理, 实现了在方式二下, 单通道 MS载波在 BS内的主载波 切换。 实例 3: 单通道 MS基站内辅载波切换 图 6是根据本发明实施例的基站内载波切换方法的实例 3的流程图,如 图 6所示, 包括如下处理: 步骤 1, MS在扫描间隔扫描 BS其他载波 (即, 上述的预定载波, 在 本实施例中, 预定载波为载波 3和载波 4 ), 并发送扫描报告 (对应于图 3中 的步骤 S302)。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1上通知 MS, 同时发送部分配置载波 2 (MS的辅载波) 频率、 同步指示 =0 (0表示 MS不需要和月艮务 BS在目标载波上同步) (对应于图 3中的步骤 S304)。 步骤 3, BS在全配置载波 3上为 MS分配资源, 通过全配置载波 1发 送资源指配信息给 MS。 步骤 4, MS终止与部分配置载波 2的连接, 调整到全配置载波 3, 在 指示的位置收发数据 (步骤 3、 步骤 4对应于图 3中的步骤 S306 )。 通过上述处理, 实现了单通道 MS的基站内辅载波切换。 实例 4: 多通道 MS载波在切换方式一下进行基站内主载波切换 图 7是根据本发明实施例的基站内载波切换方法的实例 4的流程图,图 7中示出了多通道 MS和服务 BS, 其中, MS有两个通道, 分别为 RF#1和 RF#2, 艮务 BS有四个载波, 全配置载波 1、 部分配置载波 2、 全配置载波 3 和全配置载波 4。 MS的主载波是全配置载波 1, 位于 RF#1。 MS的辅载波是 全配置载波 2, 位于 RF#2。 多通道 MS载波在切换方式一下进行基站内主载 波的切换包括如下处理: 步骤 1, MS使用 RF#2在扫描间隔扫描 BS其他载波(即, 上述的预定 载波, 在本实施例中, 预定载波为载波 3和载波 4), 并发送扫描报告(对应 于图 3中的步骤 S302)。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1上通知 MS, 同时发送全配置载波 1频率、 同步指示 =1 ( 1表示 MS需要和服务 BS 在目标载波上同步)、 专用测 巨码和在全配置载波 3 上的专用测 巨资源 (对 应于图 3中的步骤 S304)。 步骤 3, MS使用 RF#1在所指示的全配置载波 3上的时频位置发送专 用测距码。 步骤 4, MS在全配置载波 1上接收测距响应消息。 MS和 BS在全配置 载波 3上完成上行同步。 步骤 5 , MS保持和 BS在 RF#1 (全配置载波 1 ) 的连接, 直到本超帧 结束。 步骤 6, 在下一个超帧开始, MS的 RF#1调整到全配置载波 3 , 解析必 要的控制信息 (例如: 资源指配信息), 和 BS交互业务控制信息。 全配置载 波 3成为 MS新的主载波, 位于 RF#1 (步骤 3 -步骤 6对应于图 3中的步骤 S306 )。 通过上述处理,实现了多通道 MS载波在切换方式一下进行基站内主载 波的切换。 实例 5: 多通道 MS载波在切换方式二下进行基站内主载波切换 图 8是根据本发明实施例的基站内载波切换方法的实例 5的流程图,如 图 8所示, 包括以下处理: 步骤 1 , MS使用 RF#2在扫描间隔扫描 BS其他载波(即, 上述的预定 载波, 在本实施例中, 预定载波为载波 3和载波 4 ), 并发送扫描报告(对应 于图 3中的步骤 S302 )。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1上通知 MS , 同时发送全配置载波 1频率、 同步指示 =1 ( 1表示 MS需要和服务 BS 在目标载波上同步)、 专用测 巨码和在全配置载波 3 上的专用测 巨资源 (对 应于图 3中的步骤 S304 )。 步骤 3 , MS使用 RF#1在所指示的全配置载波 3上的时频位置发送专 用测距码。 步骤 4, MS在全配置载波 1上接收测距响应消息, MS和 BS在全配置 载波 3上完成上行同步。 步骤 5 , BS在全配置载波 3上为 MS分配资源, 通过全配置载波 1发 送资源指配信息给 MS。 步骤 6, MS的 RF#1终止全配置载波 1的连接, 调整到全配置载波 3 , 在指示的位置收发数据。 步骤 7, 下一个超帧开始, MS在全配置载波 3上解析必要的控制信息 (如资源指配信息), 和 BS交互业务和控制信息, 全配置载波 3成为 MS新 的主载波, 位于 RF#1 (步骤 3 -步骤 7对应于图 3中的步骤 S306 )。 通过上述处理,实现了多通道 MS载波在切换方式二下进行基站内主载 波的切换。 实例 6: 多通道 MS基站内辅载波切换 图 9是根据本发明实施例的基站内载波切换方法的实例 6的流程图,如 图 9所示, 包括如下处理: 步骤 1 , MS使用 RF#2在扫描间隔扫描 BS其他载波(即, 上述的预定 载波, 在本实施例中, 预定载波为载波 3和载波 4 ), 并发送扫描报告对应于 图 3中的步骤 S302 )。 步骤 2, BS选择全配置载波 3作为目标载波, 在全配置载波 1上通知 MS , 同时发送部分配置载波 2频率、 同步指示 =1 ( 1表示 MS 需要和服务 BS在目标载波上同步)、 专用测距码和在全配置载波 3上的专用测距资源对 应于图 3中的步骤 S304 )。 步骤 3 , MS使用 RF#2在所指示的全配置载波 3上的时频位置发送专 用测距码。 步骤 4, MS在全配置载波 1上接收测距响应消息, MS和 BS在全配置 载波 3上完成上行同步。 步骤 5 , BS在全配置载波 3上为 MS分配资源, 通过全配置载波 1发 送资源指配信息给 MS。 步骤 6, MS的 RF#2终止与部分配置载波 2的连接, 调整到全配置载 波 3 , 在指示的位置收发数据 (步骤 3 -步骤 6对应于图 3中的步骤 S306 )。 通过上述处理, 实现了多通道 MS基站内辅载波的切换。 系统实施例 根据本发明的实施例, 提供了一种基站内载波切换系统, 用于多载波系 统中基站内载波的切换, 例如, 可以用于实施上述实施例及实例中提供的基 站内载波切换的实现方法。 图 10 是根据本发明实施例的基站内载波切换系 统的框图, 如图 10所示, 包括移动台 1 (扫描模块 10、 第一获取模块 12、 发送模块 14、 切换模块 16 ) 和基站 2 (第二获取模块 20、 选择模块 22、 通 知模块 24、 保存模块 26 )。 具体地, 移动台 1 , 包括: 扫描模块 10, 用于以预定规则扫描基站 2 内的预定载波; 第一获取模 块 12连接至扫描模块 10, 用于获取包含部分或全部预定载波的信道质量信 息的扫描报告; 发送模块 14连接至第一获取模块 12, 用于将第一获取模块 12获取的扫描报告发送到基站 2, 其中, 上述预定载波为: 基站 2配置的除 移动台 1 的主载波和辅载波之外移动台 1 支持的全配置载波和部分配置载 波。 对于扫描模块 10的扫描方式, 本发明没有限制, 以下给出了关于扫描 方式的几个实例, 例如, 扫描模块 10 可以才艮据多载波扫描相关信息, 周期 性地对预定载波进行扫描; 扫描模块 10 还可以根据多载波扫描相关信息, 以事件触发方式对预定载波进行扫描; 此外, 扫描模块 10还可以接收基站 2 发送的通知消息, 并才艮据通知消息中携带的扫描信息对预定载波进行扫描, 其中, 扫描信息包括以下至少之一: 需要扫描载波的列表、 扫描开始时间、 扫描间隔。 基站 2, 包括: 第二获取模块 20, 用于获取扫描报告中信道质量信息; 选择模块 22, 连接至第二获取模块 20, 用于从预定载波中选择目标载波; 通知模块 24, 连接至选择模块 22, 用于通过载波切换通知消息将选择的目标载波通知给移 动台 1 ; 保存模块 26, 用于保存移动台 1标识、 专用测 巨码、 专用测 巨资源 之间的映射关系。 选择模块 22根据如下原则选择目标载波: 根据在选择目标载波之前预 先获取的载波负载状况选择目标载波以及信道质量信息, 并且, 在移动台 1 的源载波为移动台 1的主载波的情况下, 目标载波为全配置载波, 在源载波 为移动台 1的辅载波的情况下, 目标载波为全配置载波或者部分配置载波。 通知模块 24发送到移动台 1的载波切换通知消息中可以携带有移动台 1 的源载波信息以及是否在目标载波上进行同步的指示信息, 其中, 在目标 载波和源载波满足预定条件的情况下, 通知模块 24 还可以在载波切换通知 中携带专用测距码、 目标载波上的专用测距资源信息。 作为一种实现方式, 上述预定条件可以如下设置: 目标载波与源载波的 中心频率差大于预定频率差 A f。 也就是说, 在目标载波与源载波的中心频率 差小于预定频率差 的情况下, 移动台 1和基站 2则不需要同步。 在目标 载波与源载波的中心频率差大于预定频率差 的情况下, 通知模块 24在载 波切换通知中进一步携带专用测 巨码以及目标载波上的专用测 巨资源信息。 优选地, 基站 2中的保存模块 26还会保存移动台 1标识、 专用测距码、 专 用测 3巨资源之间的映射关系。 在满足预定条件、 且需要与基站 2在目标载波上同步的情况下, 移动台
1中的发送模块 14需要在目标载波的专用测距资源上发送专用测距码,并且, 在发送专用测距码后, 不需要在目标载波等待响应消息, 而是在主载波上接 收基站 2根据之前保存的映射关系发送的测距响应消息。 移动台 1的切换模块 16响应于从其主载波上接收测距响应消息以预定 方式从源载波切换到目标载波。 在源载波为移动台 1的主载波的情况下, 切换模块 16可以釆用以下两 种方式进行切换。 切换方式一
1、 预先设置切时刻, 在所述切换时刻到达前, 切换模块 16保持移动台 1与基站 2在当前主载波的连接。
2、 在所述切换时刻到达时, 切换模块 16使移动台 1切换到目标载波, 并在目标载波上解析获取的控制信息, 并将目标载波作为主载波。 切换方式二
1、移动台 1通过源载波接收基站 2为其在目标载波上分配资源的通知。 2、 移动台 1才艮据分配资源的通知在目标载波的指示位置接收或者发送 数据。
3、 在下一个超帧开始的情况下, 移动台 1解析其从目标载波获取的控 制信息, 并将目标载波作为主载波。 在上述源载波为移动台 1的辅载波的情况下, 切换模块 16进行载波切 换的方式为: 1、 通过主载波接收基站 2为其在目标载波上分配资源的通知; 2、 响应于分配资源的通知, 使移动台 1 终止与源载波的连接, 并切换到目 标载波, 在目标载波的指示位置接收或者发送数据。 综上所述, 借助于本发明的技术方案, 通过本发明的基站内载波切换方 案, 解决了相关技术中存在切换中断时延从而无法保证移动台业务连续性的 问题, 使得移动台能够在多载波系统中进行基站内载波间的无缝切换, 从而 保证了移动台业务的连续性, 进而可以消除载波切换的时延。 另外, 可以通过硬件、 软件、 固件、 中间件、 微码、 硬件描述语言或其 组合来实现实施例。 当用软件、 固件、 中间件或 ^啟码来实现时, 可以在诸如 存储介质的机器可读介质中存储用于执行必要任务的程序代码或码段。 (多 个) 处理器可以执行必要任务。 码段可以表示进程、 函数、 子程序、 程序、 例行程序、 子例行程序、 模块、 对象、 软件包、 类、 或指令、 数据结构、 或 程序语言的任意组合。 通过传输和 /或接收信息、 数据、 自变量、 或存储内容 来将码段耦合到另一码段或硬件电路。 信息、 自变量、 参数、 数据等可以经 由包括存储器共享、 消息传递、 令牌传递、 网络传输等的任意合适方式来传 递、 传输、 或传送。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变^^ 凡在本发明的 4青申和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种基站内载波切换方法, 用于多载波系统中基站内载波的切换, 其特 征在于, 所述方法包括:
移动台以预定规则扫描基站内的预定载波,获取包含部分或全部所 述预定载波的信道质量信息的扫描报告, 并将所述扫描报告发送到所述 基站;
所述基站获取所述扫描报告中的所述信道质量信息,从所述预定载 波中选择目标载波, 并通过消息将选择的所述目标载波通知给所述移动 台 '
响应于所述消息, 所述移动台以预定方式切换到所述目标载波。
2. 根据权利要求 1所述的方法, 其特征在于, 所述移动台以所述预定规则 扫描所述预定载波之前, 所述方法进一步包括:
所述移动台通过其主载波获取所述基站中配置的除当前主载波外 其他载波的配置信息以及多载波操作相关的广播信息, 并根据所述配置 信息和所述多载波操作相关的广播信息获取多载波扫描相关信息。
3. 根据权利要求 1或 2所述的方法, 其特征在于, 所述预定规则包括以下 至少之一:
所述移动台根据所述多载波扫描相关信息,周期性地对所述预定载 波进行扫描;
所述移动台根据所述多载波扫描相关信息,以事件触发方式对所述 预定载波进行扫描;
所述移动台接收所述基站发送的通知消息,并根据所述通知消息中 携带的扫描信息对所述预定载波进行扫描, 其中, 所述扫描信息包括以 下至少之一: 需要扫描载波的列表、 扫描开始时间、 扫描间隔。
4. 根据权利要求 1所述的方法, 其特征在于, 所述基站选择所述目标载波 包括:
所述基站才艮据所述基站预先获取的载波负载状况以及所述信道质 量信息选择所述目标载波, 并且, 如果所述移动台的源载波为所述移动 台的主载波, 则所述目标载波为全配置载波, 如果所述源载波为所述移 动台的辅载波, 则所述目标载波为所述全配置载波或者所述部分配置载 波。
5. 根据权利要求 1所述的方法, 其特征在于, 所述消息为载波切换通知消 息。
6. 根据权利要求 5所述的方法, 其特征在于, 所述载波切换通知消息中携 带有所述移动台的源载波信息、 以及是否在所述目标载波上进行同步的 指示信息, 并且, 在所述目标载波和所述源载波满足预定条件的情况下, 所述载波切换通知中还携带有以下至少之一: 专用测 3巨码、 所述目标载 波上的专用测 巨资源信息。
7. 根据权利要求 6所述的方法, 其特征在于, 所述预定条件为:
所述目标载波与所述源载波的中心频率差大于预定频率差△ f。
8. 根据权利要求 7所述的方法, 其特征在于, 在满足所述预定条件、 且所 述基站发送了所述载波切换通知之后, 所述方法进一步包括:
所述基站保存移动台标识、 所述专用测 巨码、 所述专用测 巨资源之 间的映射关系。
9. 根据权利要求 8所述的方法, 其特征在于, 在所述载波切换通知消息中 携带所述指示信息, 并且所述指示信息指示需要同步的情况下, 所述移 动台以预定方式切换到所述目标载波包括:
响应于所述载波切换通知消息,所述移动台在所述目标载波的所述 专用测距资源上发送所述专用测距码;
所述移动台在其主载波上接收所述基站根据所述映射关系发送的 测距响应消息, 并以所述预定方式从所述源载波切换到所述目标载波。
10. 根据权利要求 1至 9中任一项所述的方法, 其特征在于, 在所述源载波 为所述移动台的主载波的情况下, 所述预定方式包括:
在预定时间到达前,所述移动台保持与所述基站在当前主载波的连 接; 在预定时间到达的情况下, 所述移动台切换到所述目标载波, 并在 所述目标载波上解析获取的控制信息, 并将所述目标载波作为所述移动 台的主载波。
11. 根据权利要求 1至 9中任一项所述的方法, 其特征在于, 在所述源载波 为所述移动台的主载波的情况下, 所述预定方式包括:
所述移动台通过所述源载波接收所述基站为所述移动台在所述目 标载波上分配资源的通知;
所述移动台才艮据所述分配资源的通知在所述目标载波的指示位置 接收或者发送数据;
在下一个超帧到来时,所述移动台解析其从所述目标载波获取的控 制信息, 并将所述目标载波作为所述移动台的主载波。
12. 根据权利要求 1至 9中任一项所述的方法, 其特征在于, 在所述源载波 为所述移动台的辅载波的情况下, 所述预定方式包括:
所述移动台通过所述主载波接收所述基站为所述移动台在所述目 标载波上分配资源的通知;
响应于所述分配资源的通知, 所述移动台终止与所述源载波的连 接, 并切换到所述目标载波, 在所述目标载波的指示位置接收或者发送 数据。
13. 根据权利要求 1至 9中任一项所述的方法, 其特征在于, 所述预定载波 包括: 所述基站配置的除所述移动台的主载波和辅载波之外所述移动台 支持的全配置载波和部分配置载波。
14. 一种基站内载波切换系统, 用于多载波系统中基站内载波的切换, 其特 征在于, 所述系统包括: 移动台, 用于以预定规则扫描基站内的预定载波, 获取包含部分或 全部所述预定载波的信道质量信息的扫描报告, 并将所述扫描报告发送 到所述基站;
所述基站, 用于获取所述扫描报告中的所述信道质量信息, 从所述 预定载波中选择目标载波, 并通过载波切换通知消息将选择的所述目标 载波通知给所述移动台; 所述移动台, 进一步用于根据所述基站的预定消息, 以预定方式切 换到所述目标载波。 根据权利要求 14所述的系统, 其特征在于,
所述预定载波包括: 所述基站配置的除所述移动台的主载波和辅载 波之外所述移动台支持的全配置载波和部分配置载波; 和 /或
在所述源载波为所述移动台的主载波的情况下, 所述预定方式包 括: 预先设置切换时刻, 在所述切换时刻到达前, 所述移动台保持与所 述基站在当前主载波的连接;
在所述切换时刻到达时, 所述移动台切换到所述目标载波, 并在所 述目标载波上解析获取的控制信息, 并将所述目标载波作为所述移动台 的主载波; 或者
所述移动台通过所述源载波接收所述基站为所述移动台在所述目 标载波上分配资源的通知;
所述移动台才艮据所述分配资源的通知在所述目标载波的指示位置 接收或者发送数据;
在下一个超帧到来时,所述移动台解析其从所述目标载波获取的控 制信息, 并将所述目标载波作为所述移动台的主载波; 或者
在所述源载波为所述移动台的辅载波的情况下, 所述预定方式包 括: 所述移动台通过所述主载波接收所述基站为所述移动台在所述目标 载波上分配资源的通知;
响应于所述分配资源的通知, 所述移动台终止与所述源载波的连 接, 并切换到所述目标载波, 在所述目标载波的指示位置接收或者发送 数据。
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US20110170519A1 (en) 2011-07-14
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US8520635B2 (en) 2013-08-27
CN101668319A (zh) 2010-03-10

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