WO2008113286A1 - Method and device for determining single frequency network domain - Google Patents

Method and device for determining single frequency network domain Download PDF

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Publication number
WO2008113286A1
WO2008113286A1 PCT/CN2008/070466 CN2008070466W WO2008113286A1 WO 2008113286 A1 WO2008113286 A1 WO 2008113286A1 CN 2008070466 W CN2008070466 W CN 2008070466W WO 2008113286 A1 WO2008113286 A1 WO 2008113286A1
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WIPO (PCT)
Prior art keywords
cell
terminal
cluster
cell cluster
broadcast multicast
Prior art date
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PCT/CN2008/070466
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English (en)
French (fr)
Inventor
Guosheng Zhao
Wenqing Wang
Hai Bi
Yu Ding
Original Assignee
Da Tang Mobile Communications Equipment Co., Ltd.
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 Da Tang Mobile Communications Equipment Co., Ltd. filed Critical Da Tang Mobile Communications Equipment Co., Ltd.
Priority to KR1020097021519A priority Critical patent/KR101177973B1/ko
Priority to EP08715202.1A priority patent/EP2124464B1/en
Priority to JP2009552996A priority patent/JP5145361B2/ja
Priority to US12/531,097 priority patent/US8897194B2/en
Publication of WO2008113286A1 publication Critical patent/WO2008113286A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1845—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast broadcast or multicast in a specific location, e.g. geocast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay

Definitions

  • the present invention relates to the field of broadcast multicast services, and in particular, to a method and apparatus for determining a single frequency network domain in a mobile communication network.
  • the broadcast multicast technology is a technology in which multiple user terminals can simultaneously receive service content within the coverage area of the service. Compared with the traditional point-to-point mobile communication technology, the broadcast multicast service can greatly improve the utilization rate of the network and the frequency resource resources because it can provide communication content to a plurality of user terminals in the coverage area.
  • technologies for providing wireless broadcast multicast services using mobile communication systems have been greatly developed, and there has also been an increasing convergence with conventional digital audio broadcasting technologies and digital video broadcasting technologies.
  • the Multimedia Broadcast Multicast Service (MBMS) has been introduced in the 3rd generation mobile communication system defined by The 3fd Generation Partnership Project (3GPP).
  • MBMS refers to a point-to-multipoint service in which a data source sends data to multiple user equipment UEs. It implements sharing of core network and access network resources, especially air interface resources.
  • the MBMS defined by the 3GPP can implement high-rate multimedia service multicast and broadcast, for example, to transmit a TV service on a mobile terminal.
  • Evolved MBMS evolved MBMS
  • LTE Long Term Evolution
  • eMBMS evolved MBMS
  • the system structure is shown in Figure 1. It can be seen that the RNC node is cancelled, and Radio Resource Control (RRC) / Radio Link Control ( RLC ) / Medium Access Control (MAC) are placed in the evolved NodeB (eNodeB).
  • RRC Radio Resource Control
  • RLC Radio Link Control
  • MAC Medium Access Control
  • EPC Evolved Packet Core
  • Single Frequency Network is a concept that emerges in the development of broadcast multicast technology. It mainly focuses on the path loss and various fading in the process of wireless signal propagation, which leads to the coverage of wireless base stations. Cell coverage edge coverage and signal reception quality The decline, it is proposed to use multiple base stations to transmit the same wireless interface signal. When the user terminal receives the same signal from multiple base stations, it is equivalent to receiving the multipath transmission number from the same signal source, because each path is transmitted. The independence of ⁇ ⁇ , so that the macro-diversity overlap coverage of multiple base stations can be realized, and the coverage level and reception quality of the broadcast multicast service can be significantly improved under the condition of selecting appropriate signal processing means.
  • a SFNArea method for determining a single frequency network domain in the prior art is: Specifying the size of the SFN Area based on the broadcast multicast service plan. After a period of operation, it is found that the broadcast multicast service service area needs to be adjusted, and the size of the SFNArea is re-specified. The determination method is fixed between the two assignments, and the SFNArea is fixed. The method is a static determination method.
  • the UE may appear at the edge of some SFN Area cells, and such areas are not areas covered by macro diversity, and these UEs cannot Making full use of the single-frequency network domain results in a decline in reception quality.
  • the embodiment of the present invention provides a method and a device for configuring a single frequency network domain, which are implemented as follows:
  • a method for determining a single frequency network domain comprising:
  • a secondary cell or a secondary cell cluster that satisfies a predetermined condition is selected and determined as a single frequency network domain together with a cell or a cell cluster in which the subscription broadcast multicast service terminal exists.
  • the obtaining the cell that exists to subscribe to the broadcast multicast service terminal specifically includes:
  • the cell in which the terminal receiving the confirmation is located is set to "Yes,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
  • the cell cluster in which the statistic exists to subscribe to the broadcast multicast service terminal is implemented by: notifying the terminal subscribing to the broadcast multicast service to return acknowledgment information; initializing the acknowledgment statistics of all cells to "having"; initializing the acknowledgment statistics of all cell clusters " ⁇ ";
  • a cell cluster that is still “having” is a cell cluster of a terminal that subscribes to a broadcast multicast service; or,
  • the terminal returning the confirmation information of the broadcast subscription multicast service is implemented by: using the access probability factor to notify the terminal that subscribes to the broadcast multicast service to return the confirmation information.
  • the determining of a cell or cell cluster adjacent to a cell or cell cluster in which a subscription broadcast multicast service terminal is present and there is no subscription broadcast multicast service terminal is implemented in the following manner:
  • All neighboring cells or neighboring cell clusters of the counted cell or cell cluster are determined, and the set of the set is compared with the obtained set of cells or cell clusters that are subscribed to the broadcast multicast service.
  • the selecting a secondary cell or a secondary cell cluster that satisfies a predetermined condition is implemented in the following manner: when the secondary cell or the neighboring cell cluster that the secondary cell or the secondary cell cluster has, there are not less than a preset number of gates P ⁇ When the cell or cell cluster of the terminal that subscribes to the broadcast multicast service is counted, the auxiliary cell or the auxiliary cell cluster is selected.
  • the selecting the secondary cell or the secondary cell cluster further includes:
  • the secondary cell or the secondary cell cluster is selected to be added.
  • the threshold may be the received signal strength of the pilot channel of the cell in which the terminal is currently located.
  • the selected secondary cell or the secondary cell cluster is implemented by: Select all secondary cells or secondary cell clusters.
  • An apparatus for determining a single frequency network domain including a broadcast multicast service related cell or cell cluster obtaining unit 910, a secondary cell or cell cluster determining unit 920, a single frequency network domain determining unit 930, wherein a broadcast multicast service related cell or a cell cluster obtaining unit 910, configured to acquire a cell or a cell cluster of a terminal that subscribes to a broadcast multicast service;
  • a secondary cell or cell cluster determining unit 920 configured to determine a cell or a cell cluster adjacent to the cell or cell cluster in which the subscription broadcast multicast service terminal exists and does not have a subscription broadcast multicast service terminal; 930.
  • the broadcast multicast service related cell or cell cluster determining unit 910 includes a notification return acknowledgment information unit 911, an initializing unit 912, and a receiving and counting unit 913, wherein when the cell is counted,
  • the notification return confirmation information unit 911 the terminal for subscribing to the broadcast multicast service returns the confirmation information; the initializing unit 912 initializes the confirmation statistics of all the cells to "Yes,”; or initializes the confirmation statistics of all the cells to "None";
  • the receiving and counting unit 913 is configured to receive the confirmation information returned by the terminal, and set the cell where the terminal that receives the confirmation is set to "Yes” based on the operation of the initialization unit 912, and count the cells that are "having" as the subscription broadcast. a cell of the terminal of the multicast service; or, receiving the acknowledgment information returned by the terminal, and setting the cell in which the terminal receiving the acknowledgment is set to "Yes", and counting the cells having "Yes" as the cell of the terminal subscribing to the broadcast multicast service ;
  • a notification return confirmation information unit 911 configured to notify the terminal that subscribes to the broadcast multicast service to return the confirmation information
  • the initializing unit 912 is configured to initialize the acknowledgement statistics of all cells to "Yes,, and initialize the acknowledgement statistics of all the cell clusters to "Yes,”; or, initialize the acknowledgement statistics of all cells to "None,,, and Initialize the validation statistics for all cell clusters to "None";
  • the receiving and counting unit 913 is configured to receive the confirmation information returned by the terminal, and set the cell where the terminal that has not received the confirmation to be "None" on the output of the initialization unit 912, when the cell cluster is located.
  • the confirmation statistics of the cell is "None”
  • the confirmation statistics of the cell cluster are set to "None”
  • the cell cluster whose statistics is still "Yes” is the cell cluster of the terminal that subscribes to the broadcast multicast service; or, it will not be received.
  • the cell in which the confirmed terminal is located is set to "Yes”.
  • the confirmation statistics of all the cells in the cell cluster are "None”
  • the confirmation statistics of the cell cluster are set to "Yes”
  • the cell clusters of these "Yes” are counted as subscription broadcasts.
  • a cell cluster of a terminal of a multicast service is configured to receive the confirmation information returned by the terminal, and set the cell where the terminal that has not received the confirmation to be "None" on the output of the initialization unit 912, when the cell cluster
  • the secondary cell or cell cluster determining unit 920 includes a neighboring cell or neighboring cell cluster determining unit 921, and a set difference unit 922, where
  • a neighboring cell or neighboring cell cluster determining unit 921 configured to obtain all neighboring cells or neighboring cell clusters by the cell or cell cluster determined by the broadcast multicast service related cell or the small cell cluster statistic unit 910;
  • the set difference unit 922 is configured to use a set of neighboring cells or neighboring cell clusters determined by the neighboring cell or neighboring cell cluster calculating unit 921, and a cell determined by the broadcast multicast service related cell or cell cluster statistic unit 910 or The set of cell clusters is evaluated as difference, and the result is recorded as a secondary cell or a secondary cell cluster.
  • the single-frequency network domain determining unit 930 includes a threshold value setting unit 931, a secondary cell and a secondary cell cluster condition selecting unit 932, and a configuration unit 933, where
  • a threshold value setting unit 931 configured to preset a threshold value
  • the secondary cell and the secondary cell cluster condition selecting unit 932 is configured to: in the neighboring cell or the neighboring cell cluster that the secondary cell or the secondary cell cluster has, the terminal that belongs to the determined broadcast broadcast multicast service is not less than the threshold number.
  • the cell or cell cluster is selected as a secondary cell or a secondary cell cluster;
  • the configuration unit 933 is configured to use the cell or cell cluster determined by the broadcast multicast service related cell or cell cluster determining unit 910, together with the auxiliary cell or the auxiliary cell cluster selected by the secondary cell and the secondary cell cluster condition selecting unit 932. Configured as a single frequency network domain.
  • the cell or the cell cluster of the terminal is statistically counted, and the auxiliary cell or the auxiliary cell cluster is obtained by calculating all the neighboring cells or the neighboring cell cluster, and the auxiliary cell or the auxiliary meeting the predetermined condition is satisfied.
  • the cell cluster is configured as a single-frequency network domain together with the statistically obtained cell or cell cluster, so that when the UE is located at the edge of the cell or the cell cluster, the macro diversity gain is obtained by using the least auxiliary cell or the cell cluster, thereby ensuring these The receiving quality of the UE.
  • 1 is a structural diagram of an evolved multimedia broadcast multicast system of the prior art
  • 2 is a schematic diagram of static configuration effects of a prior art single frequency network domain
  • FIG. 3 is a flow chart of an embodiment of a method of the present invention.
  • FIG. 4 is a flowchart of a cell that periodically stores a terminal that subscribes to an evolved multimedia broadcast multicast service according to an embodiment of the method of the present invention
  • FIG. 5 is a flowchart of a cell cluster of a terminal that subscribes to an evolved multimedia broadcast multicast service according to an embodiment of the method of the present invention
  • Figure 6 is a schematic view of a hole of the present invention.
  • Figure 7 is a schematic view of an island according to the present invention.
  • Figure 9 is a block diagram of an embodiment of the apparatus of the present invention.
  • An embodiment of the present invention provides a method for configuring a single frequency network domain, determining that a cell or a cell cluster that subscribes to an eMBMS service terminal exists, and determining that a cell or a cell cluster that is adjacent to the broadcast broadcast multicast service terminal is adjacent and that there is no subscription broadcast.
  • the cell or the cell cluster of the multicast service terminal is recorded as a secondary cell or a secondary cell cluster, and the secondary cell or the secondary cell cluster that satisfies the predetermined condition is determined together with the statistically obtained cell or cell cluster as a single frequency network domain.
  • the embodiment of the present invention is exemplified by the eMBMS technical standard defined by the LTE project in 3GPP.
  • the eMBMS is carried by a high-speed physical downlink channel.
  • the SFN concept of the network technology domain is introduced.
  • the set of cells that implement eMBMS in SFN constitutes an SFN domain (SFN Area).
  • SFN Area SFN Area
  • An SFN Area contains a group of consecutively covered cells. These cells use the same radio resources in the same frequency band to simultaneously transmit eMBMS services at the same time.
  • the SFN Area consists only of the cells participating in the transmission.
  • the cells in the SFN Area are strictly synchronized, including node synchronization, content synchronization, and air interface synchronization. In this way, the UE at the edge of one cell in the SFN Area can obtain the synchronization signal of other cells in the SFN Area, thereby obtaining the downlink macro diversity gain.
  • the cell area that the SFN Area can include is limited.
  • the largest SFN cell area The domain is called the Maximum SFN Area.
  • the size of the SFN Area is configurable.
  • FIG. 2 illustrates the static configuration effect of a prior art single frequency network domain. Simply in a fixed large geographical area, it is uneconomical to use all base stations to provide SFN coverage for the transmission of broadcast multicast service content, which will generate unnecessary interference in the entire network, and will also bring frequency. The efficiency of the use of language resources is reduced.
  • the system before transmitting the eMBMS service, the system performs statistics on the UEs that subscribe to the service, and obtains the number of UEs that subscribe to the service, so as to decide to use the radio bearer to transmit the eMBMS service according to the statistical result.
  • the range of the statistics UE is in the Maximum SFN Area.
  • the system may send a paging channel or a broadcast channel to notify the UE that subscribes to the eMBMS service to return the acknowledgement information, and the system may count the number of UEs that subscribe to the eMBMS service according to the acknowledgement information.
  • the system can re-count the number of UEs that subscribe to the eMBMS service to confirm whether the current radio bearer mode is optimal. If it is not optimal, the bearer mode is further changed. In this process, in general, the UE that subscribes to the eMBMS service needs to return the acknowledgment information through the uplink random access channel.
  • the access probability factor is used to control the number of UEs that return information, that is, only a certain UE returns acknowledgment information with a certain probability according to the access probability factor, and the system calculates the UE that subscribes to the eMBMS service according to the access probability factor and the number of UEs that return information.
  • number. 3 is a flow chart showing an embodiment of a method of the present invention, including the following steps:
  • Step 301 Determine a cell or a cell cluster of a UE that has subscribed to the eMBMS service.
  • the determined cell that subscribes to the eMBMS service UE is within the Maximum SFN Area.
  • the operator can also set the statistical operation domain, which is a subset of the Maximum SFN Area. ⁇ Home needs to be set
  • the size of the statistical operation domain is calculated, and the cell that has subscribed to the eMBMS service UE is counted on the statistical operation domain.
  • the cell of the UE that subscribes to the eMBMS service the transmitting function of the eMBMS service of these cells should be opened. Therefore, the cell that receives the acknowledgment from the UE in the statistics process is counted as "Yes”.
  • the cell that has not received the reply confirmation from the UE is counted as "none”.
  • Step 401 Notifying the UE that subscribes to the eMBMS service to return the confirmation information.
  • Step 402 Initialize the confirmation statistics of all cells to "Yes".
  • this step can also initialize all cell confirmation statistics to "none".
  • steps 402 and 401 do not have a strict sequence.
  • Step 403 Receive the acknowledgement information returned by the UE, and set the cell where the UE that has not received the acknowledgement is set to "None".
  • the cell whose final statistics are "having" is the cell of the UE that subscribes to the eMBMS service.
  • step 403 sets the cell in which the confirmed UE is located to "Yes".
  • a cell cluster may be a set including one or more consecutive cells, and the cells included therein may be preset by an operator as needed.
  • the eMBMS service transmission of all cells on the cluster is uniformly opened or closed according to the statistical result of the cell cluster.
  • the decision method of the cell cluster is: if the statistics of any cell in the cell cluster is "Yes”, then the cell cluster is set to "Yes”; if the statistics of all cells in the cell cluster are "None", the cell cluster is set to " no".
  • Step 501 Notifying the UE that subscribes to the eMBMS service to return the confirmation information.
  • Step 502 Initialize the confirmation statistics of all cells to "Yes”; initialize the confirmation statistics of all cell clusters to "Yes”.
  • Step 503 Receive the acknowledgement information returned by the UE, and set the cell where the UE that has not received the acknowledgement is set to "None".
  • Step 504 When the confirmation statistics of all the cells in the cell cluster are "None", the confirmation statistics of the cell cluster are set to "None".
  • the cell cluster whose final statistics are "having" is the cell cluster of the UE that subscribes to the eMBMS service.
  • Step 502 may also initialize the acknowledgment statistics of all cells to "None,” and initialize the acknowledgment statistics of all the cell clusters to "None.”
  • the cell in which the confirmed UE is located is set to "Yes”.
  • the confirmation statistic of the cell cluster is "Yes"
  • the confirmation statistic of the cell cluster is set to "Yes”.
  • the cell clusters set to "none" cannot always turn off their eMBMS transmission function, but The eMBMS transmission function is conditionally turned on in the subsequent steps.
  • the UE that subscribes to the eMBMS service is notified of the return confirmation information.
  • the access probability factor is used to notify the UE that subscribes to the eMBMS service to return the acknowledgement information, and the system according to the access probability factor.
  • the number of UEs that return information and the number of UEs that subscribe to the eMBMS service are calculated.
  • Figure 6 shows the "hole” situation. As shown in the figure, for a cell whose statistic is “None”, whether to turn off its transmission function should also refer to whether the eMBMS function of the cell adjacent to the cell is open. If the "hole” situation shown in Figure 6 occurs, that is, a cell whose statistic is "None", when the adjacent cell is "Yes", the "hole” cell should enable the eMBMS transmission function.
  • Figure 7 shows the "island” situation. As shown in the figure, when the confirmation result of a cell is "Yes”, When the neighboring cell statistics result is "None", the eMBMS transmission function of only the cell with "Yes” is not able to obtain the macro diversity gain. Therefore, the cell adjacent to it should also turn on the transmission function.
  • the opening or closing of the eMBMS function of a cell in the SFNArea should be determined in conjunction with the on/off condition of the energy of the neighboring cell.
  • the transmitting function of the cell should also be in an open state. In order to achieve this, it can be achieved by the methods given in the following steps 302 and 303.
  • Step 302 Determine that all auxiliary cells or auxiliary cell clusters of the cell or cell cluster that subscribe to the eMBMS service UE exist.
  • each cell cluster may include multiple cells. When the number of cells included in all cell clusters is 1, it is degraded to the same concept as the neighbor cell list for handover purposes. By optimizing the correspondence between adjacent cell clusters, the computational cost of determining the secondary cell can be reduced.
  • the cell or cell cluster in which the UE is subscribed to the eMBMS service is a class A cell or a cell cluster, and the other cells or cell clusters are recorded as a class B cell or a cell cluster.
  • Class A is a cell or a cell cluster that will open the eMBMS service transmission function
  • Class B is a cell or a cell cluster to be processed. It is necessary to find a secondary cell or a secondary cell cluster in a B-type cell or a small cluster.
  • C is the existence of the subscription eMBMS All secondary cells or secondary cell clusters of cells or cell clusters of the serving UE.
  • Step 303 Set the determined cell or cell cluster and the secondary cell or the secondary cell cluster as the SFNArea that sends the eMBMS service.
  • the resulting set A the cell or cell cluster within it must open the eMBMS service transmission function.
  • the eMBMS service is transmitted on the set A, and the cell or cluster of cells in the set C.
  • a threshold value may be set, and the Kb is set as Kb.
  • Kb Kb
  • the cell in the neighboring cell has Kb or more than Kb belongs to the set A
  • the terminal When Kb is 2 or a value greater than 2, if the terminal is at the edge of the cell d, the other side is the neighboring cell e, d is to enable the eMBMS transmission function, the e cell belongs to the C-type cell, and the e-cell neighbor Only the d cell in the area belongs to A, and according to the foregoing processing method, the e cell does not open the eMBMS transmission function.
  • the terminal detects that the signal of the e-cell is strong, it is advantageous for the terminal to obtain the macro-diversity gain at the edge of the d-cell.
  • the same-frequency signal detected by the UE of the Activated state is reported to the network side.
  • the network side may open the transmitting function of the neighboring cell according to the pilot signal strength of the C-type cell in the neighboring cell reported by the UE, when it is greater than the threshold.
  • the threshold may be preset, for example, the received signal strength of the pilot channel of the cell in which the UE is currently located, or the neighbor cell signal strength when the handover is set in the network, or other values. If the e cell belongs to a cell cluster, the transmitting function of the cell cluster is turned on.
  • the threshold Kb can be set to a default value of 1, and its value can be changed as needed. And when the change is greater than 1, the signal strength of the C-type cell in the neighboring cell can be further corrected.
  • the cell or the cell cluster of the terminal is counted, and the auxiliary cell or the auxiliary cell cluster is obtained by calculating all the neighboring cells or the neighboring cell cluster, and the auxiliary cell or the auxiliary cell cluster satisfying the predetermined condition is obtained.
  • It is configured as a single-frequency network domain together with the statistically obtained cell or cell cluster, so that a dynamic configuration of the single-frequency network domain can be realized, and the minimum auxiliary cell or cell cluster can be used when the UE is located at the edge of the cell or the cell cluster.
  • the macro diversity gain is obtained, thereby ensuring the reception quality of these UEs, and saving radio resources and transmission resources.
  • Figure 9 shows a block diagram of an embodiment of the apparatus.
  • the apparatus for determining a single frequency network domain includes a broadcast multicast service related cell or cell cluster obtaining unit 910, a secondary cell or cell cluster determining unit 920, and a single frequency network domain determining unit 930, where
  • a broadcast multicast service related cell or cell cluster acquiring unit 910 configured to acquire a cell or a cell cluster of a terminal that subscribes to a broadcast multicast service
  • a secondary cell or cell cluster determining unit 920 configured to determine a cell or a cell cluster adjacent to the cell or cell cluster in which the subscription broadcast multicast service terminal exists and does not have a subscription broadcast multicast service terminal; 930.
  • the broadcast multicast service related cell or cell cluster determining unit 910 includes a notification return acknowledgment information unit 911, an initializing unit 912, and a receiving and counting unit 913, wherein when the cell is counted,
  • the notification return confirmation information unit 911 the terminal for subscribing to the broadcast multicast service returns the confirmation information; the initializing unit 912 initializes the confirmation statistics of all the cells to "Yes,”; or initializes the confirmation statistics of all the cells to "None";
  • the receiving and counting unit 913 is configured to receive the confirmation information returned by the terminal, and set the cell where the terminal that receives the confirmation is set to "Yes” based on the operation of the initialization unit 912, and count the cells that are "having" as the subscription broadcast. a cell of the terminal of the multicast service; or, receiving the acknowledgment information returned by the terminal, and setting the cell in which the terminal receiving the acknowledgment is set to "Yes", and counting the cells having "Yes" as the cell of the terminal subscribing to the broadcast multicast service ;
  • the statistics are clusters of cells
  • a notification return confirmation information unit 911 configured to notify the terminal that subscribes to the broadcast multicast service to return the confirmation information
  • the initializing unit 912 is configured to initialize the acknowledgement statistics of all cells to "Yes,, and initialize the acknowledgement statistics of all the cell clusters to "Yes,”; or, initialize the acknowledgement statistics of all cells to "None,,, and Initialize the validation statistics for all cell clusters to "None";
  • the receiving and counting unit 913 is configured to receive the acknowledgement information returned by the terminal, and set the cell where the terminal that does not receive the acknowledgement to be "None" on the ⁇ 5 output of the initialization unit 912, when all the cells in the cell cluster
  • the confirmation statistics is "None”
  • the confirmation statistics of the cell cluster are set to "None”
  • the cell cluster whose statistics is still “Yes” is the cell cluster of the terminal that subscribes to the broadcast multicast service; or, the terminal that has not received the confirmation is received.
  • the cell in which the cell is located is set to "Yes”.
  • the confirmation statistics of all cells in the cell cluster are "None”
  • the confirmation statistics of the cell cluster are set to "Yes”
  • the "Current" cell clusters are counted as subscription broadcast multicast services.
  • the cell cluster of the terminal is configured to receive the acknowledgement information returned by the terminal, and set the cell where the terminal that does not receive the acknowledgement to be "None" on the ⁇ 5 output of the initialization unit 9
  • the secondary cell or cell cluster determining unit 920 includes a neighboring cell or neighboring cell cluster determining unit 921, and a set difference unit 922, where
  • a neighboring cell or neighboring cell cluster determining unit 921 configured to obtain all neighboring cells or neighboring cell clusters by the cell or cell cluster determined by the broadcast multicast service related cell or the small cell cluster statistic unit 910;
  • the set difference unit 922 is configured to use a set of neighboring cells or neighboring cell clusters determined by the neighboring cell or neighboring cell cluster calculating unit 921, and a cell determined by the broadcast multicast service related cell or cell cluster statistic unit 910 or The set of cell clusters is evaluated as difference, and the result is recorded as a secondary cell or a secondary cell cluster.
  • the single-frequency network domain determining unit 930 includes a threshold value setting unit 931, a secondary cell and a secondary cell cluster condition selecting unit 932, and a configuration unit 933, where
  • a threshold value setting unit 931 configured to preset a threshold value
  • the auxiliary cell and the auxiliary cell cluster condition selecting unit 932 is configured to: in the neighboring cell or the neighboring cell cluster that the secondary cell or the secondary cell cluster has, the number of the threshold value that belongs to the determined presence of the subscription broadcast multicast service The cell or the cell cluster of the terminal is selected as a secondary cell or a secondary cell cluster;
  • the configuration unit 933 is configured to use the cell or cell cluster determined by the broadcast multicast service related cell or cell cluster determining unit 910, and the auxiliary selected by the auxiliary cell and the auxiliary cell cluster condition selecting unit 932.
  • the helper cell or the secondary cell cluster is configured as a single frequency network domain.
  • the method for dynamically configuring the SFN Area by using the device embodiment of the present invention is similar to the foregoing method, and details are not described herein again.

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Description

确定单频网络域的方法及装置
本申请要求于 2007 年 3 月 16 日提交中国专利局、 申请号为 200710064519.6、 发明名称为 "确定单频网络域的方法及装置"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
本发明涉及广播多播业务技术领域，特别涉及一种移动通信网络中确定单 频网络域的方法及装置。
背景技术
广播多播技术是一种在业务覆盖区域范围内，多个用户终端可以同时接收 业务内容的技术。与传统的点对点方式的移动通信技术相比， 广播多播业务由 于可以向覆盖区域内的多个用户终端提供通信内容，可以极大地提高网络及频 语资源的利用率。近年来， 利用移动通信系统提供无线广播多播业务的技术获 得了很大的发展， 并且与传统的数字音频广播技术、数字视频广播技术等也出 现了日益融合的趋势。 目前在第三代合作伙伴项目 （ The 3fd Generation Partnership Project, 3GPP )定义的第 3代移动通信系统中已经引入了多媒体广 播多播业务（ Multimedia Broadcast Multicast Service, MBMS )。 MBMS是指一 个数据源向多个用户设备 UE发送数据的点到多点业务， 它实现了核心网和接 入网资源的共享，尤其是空口资源。 3GPP定义的 MBMS能实现高速率的多媒 体业务组播和广播， 例如实现在移动终端上发送电视业务。
为了实现更高速率的多媒体数据传输和更好的服务质量， 3GPP在长期演 进（ Long Term Evolution, LTE )计划中对现有的 MBMS技术进行了改进， 提 出了演进型 MBMS ( evolved MBMS, eMBMS )。 其系统结构如图 1所示， 可 见其取消了 RNC节点 , 无线资源控制（ RRC ) /无线链路控制（ RLC ) /媒体接 入控制 （MAC )均置入演进型基站（evolved NodeB, eNodeB ) 中实现。 演进 分组核心网 （Evolved Packet Core, EPC )用于移动性控制和业务承载管理等 功能的实施。
单频网络（ Single Frequency Network, SFN )是在广播多播技术发展中出 现的一种概念， 其主要针对无线信号传播过程中存在的路径损耗和各种衰落， 导致无线基站的覆盖区域内特别是小区边沿的业务覆盖盲点和信号接收质量 的下降，提出利用多个基站发送同样的无线接口信号， 当用户终端接收到来自 多个基站的同样信号时，相当于接收到来自同一信号源的多径传^ ί言号， 由于 各个路径传^ ί言号的独立性， 因而可以实现多基站的宏分集重叠覆盖，在选择 适当的信号处理手段的条件下，可以显著提高广播多播业务的覆盖水平和接收 质量。
现有技术的一种确定单频网络域的（SFNArea )方法是： 基于广播多播业 务规划， 指定 SFN Area的大小。 当经过一段时间的运营， 发现广播多播业务 服务区需要调整时， 重新指定 SFNArea的大小。该确定方法在两次指定之间， SFNArea是固定不变的， 该方法是静态确定方法。
然而， 在实际的无线网络环境中， 由于订阅具体广播多播业务的 UE的分 布是动态变化的， UE可能出现在一些 SFN Area 小区的边缘， 这样的区域不 是宏分集覆盖的区域，这些 UE无法充分利用单频网络域，导致接收质量下降。
发明内容
本发明实施例的目的是提供一种确定单频网络域的方法及装置，以实现确 定单频网络域。
为解决上述技术问题，本发明实施例提供一种单频网络域的配置方法及装 置是这样实现的：
一种确定单频网络域的方法， 包括：
获取存在订阅广播多播业务终端的小区或小区簇；
确定与所述存在订阅广播多播业务终端的小区或小区簇相邻且不存在订 阅广播多播业务终端的小区或小区簇， 并记为辅助小区或辅助小区簇；
选取满足预定条件的辅助小区或辅助小区簇 ,将其与存在订阅广播多播业 务终端的小区或小区簇一同确定为单频网络域。
所述获取存在订阅广播多播业务终端的小区具体包括：
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "有"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "无，，， 统计仍为 "有" 的小区为订阅广播多播业务的终端的小区； 或，
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "无 "；
接收终端返回的确认信息， 将收到确认的终端所在的小区设置为 "有，，， 统计这些 "有" 的小区为订阅广播多播业务的终端的小区。
所述统计存在订阅广播多播业务终端的小区簇由以下方式实现： 通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "有"； 将所有小区簇的确认统计初始化为 "有"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "无"； 当小区簇内所有小区的确认统计为 "无"时，设置该小区簇的确认统计为 "无'，； 统计仍为 "有" 的小区簇为订阅广播多播业务的终端的小区簇； 或，
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "无"； 将所有小区簇的确认统计初始化为 "无"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "有"； 当小区簇内所有小区的确认统计为 "无"时，设置该小区簇的确认统计为 "有"； 统计这些 "有" 的小区簇为订阅广播多播业务的终端的小区簇。
所述通知订阅广播多播业务的终端返回确认信息由以下方式实现： 采用接入概率因子通知订阅广播多播业务的终端返回确认信息。
所述确定与存在订阅广播多播业务终端的小区或小区簇相邻且不存在订 阅广播多播业务终端的小区或小区簇由以下方式实现：
确定统计的小区或小区簇的所有邻小区或邻小区簇，将其构成的集合与所 述获取的存在订阅广播多播业务的小区或小区簇构成的集合求差。
所述选取满足预定条件的辅助小区或辅助小区簇由以下方式实现： 当辅助小区或辅助小区簇具有的邻小区或邻小区簇中，有不小于预先设定 的门 P艮值数目个属于所述统计存在订阅广播多播业务的终端的小区或小区簇 时， 选取该辅助小区或辅助小区簇。
所述选取辅助小区或辅助小区簇进一步包括：
当终端上报的邻小区中存在导频信号强度大于阔值的辅助小区或辅助小 区簇时， 增加选取该辅助小区或辅助小区簇。
所述阔值可以为终端当前所在小区导频信道的接收信号强度。
当门限值为 1时， 所述选取辅助小区或辅助小区簇由以下方式实现： 选取所有辅助小区或辅助小区簇。
一种确定单频网络域的装置 ,包括广播多播业务相关小区或小区簇获取单 元 910， 辅助小区或小区簇确定单元 920， 单频网络域确定单元 930， 其中， 广播多播业务相关小区或小区簇获取单元 910 , 用于获取存在订阅广播多 播业务的终端的小区或小区簇；
辅助小区或小区簇确定单元 920, 用于确定与所述存在订阅广播多播业务 终端的小区或小区簇相邻且不存在订阅广播多播业务终端的小区或小区簇； 单频网络域确定单元 930, 用于将所述广播多播业务相关小区或小区簇确 定单元 910统计的小区或小区簇，与辅助小区或小区簇计算单元 920中得到的 且满足预定条件的辅助小区或辅助小区簇， 一同确定为单频网络域。
所述广播多播业务相关小区或小区簇确定单元 910 包括通知返回确认信 息单元 911 , 初始化单元 912， 接收和统计单元 913， 其中， 当统计的是小区 时，
通知返回确认信息单元 911，用于订阅广播多播业务的终端返回确认信息； 初始化单元 912, 将所有小区的确认统计初始化为 "有，，； 或将所有小区 的确认统计初始化为 "无"；
接收和统计单元 913，用于接收终端返回的确认信息，并在初始化单元 912 操作的基础上， 将收到确认的终端所在的小区设置为 "有"， 统计这些 "有" 的小区为订阅广播多播业务的终端的小区； 或， 接收终端返回的确认信息， 并 将收到确认的终端所在的小区设置为 "有"， 统计这些 "有" 的小区为订阅广 播多播业务的终端的小区；
当统计的为小区簇时，
通知返回确认信息单元 911， 用于通知订阅广播多播业务的终端返回确认 信息；
初始化单元 912， 用于将所有小区的确认统计初始化为 "有，，， 并将所有 小区簇的确认统计初始化为 "有，，； 或，将所有小区的确认统计初始化为 "无，，， 并将所有小区簇的确认统计初始化为 "无"；
接收和统计单元 913，用于接收终端返回的确认信息，并在初始化单元 912 操作的 出上， 将未收到确认的终端所在的小区设置为 "无"， 当小区簇内所 有小区的确认统计为 "无" 时， 设置该小区簇的确认统计为 "无"， 统计仍为 "有"的小区簇为订阅广播多播业务的终端的小区簇； 或， 将未收到确认的终 端所在的小区设置为 "有"， 当小区簇内所有小区的确认统计为 "无" 时， 设 置该小区簇的确认统计为 "有"， 统计这些 "有" 的小区簇为订阅广播多播业 务的终端的小区簇。
所述辅助小区或小区簇确定单元 920 包括邻小区或邻小区簇确定单元 921 , 集合求差单元 922， 其中，
邻小区或邻小区簇确定单元 921 , 用于由所述广播多播业务相关小区或小 区簇统计单元 910确定的小区或小区簇的得到所有邻小区或邻小区簇；
集合求差单元 922, 用于将由邻小区或邻小区簇计算单元 921确定的邻小 区或邻小区簇构成的集合，与由所述广播多播业务相关小区或小区簇统计单元 910确定的小区或小区簇构成的集合求差， 并将结果记为辅助小区或辅助小区 簇。
所述单频网络域确定单元 930包括门限值设定单元 931， 辅助小区与辅助 小区簇条件选取单元 932， 配置单元 933， 其中，
门限值设定单元 931， 用于预先设定一个门限值；
辅助小区与辅助小区簇条件选取单元 932， 用于在辅助小区或辅助小区簇 具有的邻小区或邻小区簇中，将不小于门限值数目的属于所述确定存在订阅广 播多播业务的终端的小区或小区簇选取为辅助小区或辅助小区簇；
配置单元 933 , 用于将所述广播多播业务相关小区或小区簇确定单元 910 确定的小区或小区簇，与辅助小区与辅助小区簇条件选取单元 932中选取的辅 助小区或辅助小区簇， 一同配置为单频网络域。
由以上本发明实施例提供的技术方案可见，统计存在该终端的小区或小区 簇， 并通过计算其所有邻小区或邻小区簇得到辅助小区或辅助小区簇，将满足 预定条件的辅助小区或辅助小区簇与统计得到的小区或小区簇一同配置为单 频网络域， 这样， 能保证当 UE位于小区或小区簇的边缘时， 使用最少的辅助 小区或小区簇获取宏分集增益， 从而保证了这些 UE的接收质量。
附图说明
图 1为现有技术的演进型多媒体广播多播系统结构图； 图 2为现有技术单频网络域的静态配置效果示意图；
图 3为本发明方法实施例的流程图；
图 4 为本发明方法实施例中统计存在订阅演进型多媒体广播多播业务的 终端的小区的流程图；
图 5 为本发明方法实施例中统计存在订阅演进型多媒体广播多播业务的 终端的小区簇的流程图；
图 6为本发明孔洞示意图；
图 7为本发明孤岛示意图；
图 8分为图 8-1和图 8-2, 分别为本发明方法实施例中 Kb=l时的动态配 置效果示意图， 和 Kb=2时的动态配置效果示意图；
图 9为本发明装置实施例的框图。
具体实施方式
本发明实施例提供一种单频网络域的配置方法，确定存在订阅 eMBMS业 务终端的小区或小区簇，确定与所述存在订阅广播多播业务终端的小区或小区 簇相邻且不存在订阅广播多播业务终端的小区或小区簇，并记为辅助小区或辅 助小区簇，将满足预定条件的辅助小区或辅助小区簇与统计得到的小区或小区 簇一同确定为单频网络域。
本发明实施例以 3GPP中的 LTE项目所定义的 eMBMS技术标准为例来说 明。 eMBMS通过高速物理下行信道来承载， 在此基础上， 引入了网络技术领 域的 SFN概念。 以 SFN实现 eMBMS的小区的集合构成 SFN域（ SFN Area )。 具体的， SFNArea在协议中的规定如下：
一个 SFN Area包含一组连续覆盖的小区， 这些小区在相同的频段内采用 相同的无线资源， 在同一时间同步的传输 eMBMS业务。 SFN Area仅由参加 传输的小区组成。
SFN Area内的小区是严格同步的， 其包括节点同步、 内容同步和空口同 步。 这样， SFN Area内处于一个小区边缘的 UE可以得到该 SFN Area内的其 它小区的同步信号， 从而获取下行宏分集增益。
受 eMBMS业务所要覆盖区域的限制及可以实现同步的小区数量及分布， SFN Area可以包括的小区区域是有一定限制的。 相应地， 最大的 SFN小区区 域称为 Maximum SFN Area。 Maximum SFN Area中， SFN Area的大小是可以 配置的。
现有的 SFN Area的静态配置方法， 从网络规划角度， 还要考虑引入足够 的冗余， 这样， 导致 SFN Area的范围增大。 图 2示出了现有技术单频网络域 的静态配置效果。 简单地在一个固定的很大的地理区域范围内， 利用所有基站 提供 SFN覆盖进行广播多播业务内容的传送是不经济的， 将会在整个网络中 产生不必要的干扰 , 还会带来频语资源利用效率的降低。
为了使本技术领域的人员更好地理解本发明方案，下面结合附图和实施方 式对本发明作进一步的详细说明。
现有技术中， 系统在传输 eMBMS业务前， 要对订阅该业务的 UE进行统 计， 得到的订阅该业务的 UE数目， 以根据该统计结果决定采用那种无线承载 方式传输 eMBMS业务。 统计的 UE所在范围在 Maximum SFN Area内。
具体的， 系统可以通过每个小区发送寻呼信道或广播信道来通知订阅 eMBMS业务的 UE返回确认信息， 进而系统可以根据该确认信息统计出订阅 eMBMS业务的 UE数目。 在 eMBMS业务传输过程中 , 系统可以重新统计订 阅 eMBMS业务的 UE数目， 以确认当前无线承载方式是否为最佳， 如果不是 最佳， 进一步会改变承载方式。 该过程中， 一般地， 订阅 eMBMS业务的 UE 需要通过上行随机接入信道返回确认信息， 为了避免过多 UE都同时返回该消 息而导致上行随机接入信道拥塞， 系统在发出通知确认信息时， 采用接入概率 因子对返回信息的 UE数目进行控制， 即只有一定 UE根据该接入概率因子以 一定概率返回确认信息， 系统根据接入概率因子和返回信息的 UE数目计算得 到订阅 eMBMS业务的 UE数目。 图 3示出了本发明方法实施例的流程图， 包括以下步骤：
步骤 301 : 确定存在订阅 eMBMS业务的 UE的小区或小区簇。
前面提到现有技术统计订阅 eMBMS业务的 UE的方法。 基于该方法， 可 以统计出存在订阅 eMBMS业务 UE的小区。
确定的订阅 eMBMS业务 UE的小区在 Maximum SFN Area内。 当然运营 商也可以设定统计操作域， 该域是 Maximum SFN Area的子集。 ^居需要设定 统计操作域的大小， 在该统计操作域上对存在订阅 eMBMS业务 UE的小区进 行统计。
所述存在订阅 eMBMS业务的 UE的小区 , 这些小区的 eMBMS业务的发 射功能是应当打开的， 因此， 将统计过程中收到 UE 回复确认的小区统计为 "有"。相应地，根据订阅 eMBMS业务的 UE统计结果， 将没有收到 UE回复 确认的小区统计为 "无"。
以下给出实现该步骤的具体方法， 如图 4所示：
步骤 401： 通知订阅 eMBMS业务的 UE返回确认信息。
步骤 402: 将所有小区的确认统计初始化为 "有"。
当然， 该步骤也可将所有小区确认统计初始化为 "无"。
而且， 步骤 402与 401没有严格的先后顺序。
步骤 403: 接收 UE返回的确认信息， 将未收到确认的 UE所在的小区设 置为 "无"。
最终统计为 "有" 的小区即为存在订阅 eMBMS业务的 UE的小区。
相应地， 当步骤 402为将所有小区确认统计初始化为 "无，，， 步骤 403将 收到确认的 UE所在的小区设置为 "有"。
但是， 考虑到在这些统计为 "有"的小区边缘需要有宏分集作用以保证位 于边缘的 UE接收 eMBMS业务， 这些设置为 "无" 的小区不能一律关闭其 eMBMS发射功能， 而是在之后的步骤中有条件的打开 eMBMS发射功能。
可以将具有一些小区组合在一起， 形成一个小区簇， 统一进行管理。 例如 一个 eNodeB下各个小区可能共享传输资源这一特性， 则将该 eNodeB下所有 的小区作为一个小区簇管理。 小区簇可以是包含一个或多个连续小区的集合， 其所包括的小区可以由运营商根据需要预先设定。
由于一个小区簇内的小区进行统一管理，才 据小区簇的统计结果， 统一打 开或关闭该簇上所有小区的 eMBMS业务的发射。 小区簇的判决方法为： 如果 小区簇中任一小区的统计为 "有"， 则该小区簇设为 "有"； 如果小区簇中所有 小区的统计为 "无"， 该小区簇设为 "无"。
小区簇的确认统计方法的流程图如图 5所示：
步骤 501 : 通知订阅 eMBMS业务的 UE返回确认信息。 步骤 502: 将所有小区的确认统计初始化为 "有"； 将所有小区簇的确认 统计初始化为 "有"。
与前面类似的， 这里的步骤 502与 501也没有严格的先后顺序。
步骤 503: 接收 UE返回的确认信息， 将未收到确认的 UE所在的小区设 置为 "无"。
步骤 504: 当小区簇内所有小区的确认统计为 "无" 时， 设置该小区簇的 确认统计为 "无"。
最终统计为 "有" 的小区簇即为存在订阅 eMBMS业务的 UE的小区簇。 步骤 502也可以将所有小区的确认统计初始化为 "无，，； 将所有小区簇的 确认统计初始化为 "无"。 步骤 503中， 将收到确认的 UE所在的小区设置为 "有"。 步骤 504中， 当小区簇内存在确认统计为 "有" 时， 设置该小区簇的 确认统计为 "有"。
类似的， 考虑到在这些统计为 "有"的小区簇边缘需要有宏分集作用以保 证位于边缘的 UE接收 eMBMS业务， 这些设置为 "无" 的小区簇不能一律关 闭其 eMBMS发射功能，而是在之后的步骤中有条件的打开 eMBMS发射功能。
特别的， 当步骤 501至 504中的小区簇中只包含一个小区时，该流程可以 简化为步骤 401至 403所述的流程。
上述步骤 401至 403与步骤 501至 504中， 通知订阅 eMBMS业务的 UE 返回确认信息可以如前面所述的，采用接入概率因子通知订阅 eMBMS业务的 UE返回确认信息， 进而系统根据接入概率因子和返回信息的 UE数目计算得 到订阅 eMBMS业务的 UE数目。
考虑到需要保证位于小区或小区簇边缘的 UE得到宏分集增益， 并参考 SFN Area的连续性定义， 在后续步骤中有条件的打开或关闭 eMBMS发射功 能需要注意以下的 "孔洞，， 和 "孤岛，， 的情况。
图 6示出了 "孔洞" 情况。 如图所示， 对于确认统计为 "无" 的小区， 是 否关闭其发射功能还应参考与该小区相邻的小区的 eMBMS 功能是否是打开 状态。 如出现图 6所示的 "孔洞" 情况时， 即一个确认统计为 "无" 的小区， 其相邻的小区是 "有" 时， 该 "孔洞" 小区应当打开 eMBMS的发射功能。
图 7示出了 "孤岛"情况。如图所示， 当一个小区的确认统计结果为 "有"， 而其相邻的小区统计结果都为 "无" 时， 只打开 "有" 的小区的 eMBMS发射 功能是不能获得宏分集增益的， 因此， 与其相邻的小区也应该打开发射功能。
由上述 "孔洞，，和 "孤岛，，两种情况可知， SFNArea内一个小区的 eMBMS 功能的打开或关闭， 应当结合与其相邻的小区的该能的打开 /关闭情况确定。 当存在一个小区，其邻区的发射功能是打开状态， 则该小区的发射功能也应当 为打开状态。为了达到该目的，可以通过下述步骤 302和 303给出的方法实现。
步骤 302: 确定所述存在订阅 eMBMS业务 UE的小区或小区簇的所有辅 助小区或辅助小区簇。
在网络规划中，通常都需要为每个小区确定与其相邻的小区， 并采用小区 标识来建立其对应关系，一般称为邻小区列表。邻小区列表表明了与小区存在 覆盖范围相邻的其它小区，每个小区的实际邻小区列表是各不相同的并需要通 过对覆盖区域内无线信号强度的分析或测量得到，邻小区列表在现有技术被用 于切换算法中确定目标小区。本发明中，将邻小区列表的概念进一步推广到确 定 SFN Area的方法中， 即预先通过网络规划建立每个小区簇的相邻小区簇对 应关系， 并将该对应关系存储于确定 SFN Area的设备实体中， 每个小区簇可 以包含多个小区， 当所有小区簇中包含的小区数目都为 1时， 即退化为与用于 切换目的邻小区列表同样的概念。通过优化相邻小区簇对应关系，可以减少确 定辅助小区的计算开销。
上述步骤 301中统计得到的所有小区或小区簇的集合，该集合内所有小区 或小区簇的邻区或邻小区簇组成的一个范围更大的集合，后一集合减去前一集 合即为本步骤所要求的所有辅助小区或辅助小区簇。 具体如下：
记存在订阅 eMBMS业务 UE的小区或小区簇为 A类小区或小区簇，反之， 其它小区或小区簇记为 B类小区或小区簇。 A类为一定会打开 eMBMS业务发 射功能的小区或小区簇， B类为待处理的小区或小区簇，需要在 B类小区或小 区簇中找出辅助小区或辅助小区簇。
记所有 A类小区或小区簇构成集合 Α，， A，中的小区为
则遍历 , 得到 的邻小区集合， 将其记为 Xi;
n
将所有的 Xi减去 A，，即 |J -Α',得到集合 C， C即为存在订阅 eMBMS 业务 UE的小区或小区簇的所有辅助小区或辅助小区簇。
步骤 303: 将所述确定的小区或小区簇与辅助小区或辅助小区簇设为发送 eMBMS业务的 SFNArea。
如前所述， 得到的集合 A，， 其内的小区或小区簇一定会打开 eMBMS业 务发射功能。 步骤 302中得到的集合 C, 由于包围着集合 A，， 为了保证 A，内 包含的小区边缘的下行宏分集增益， 集合 C 中的小区或小区簇也应当打开 eMBMS业务发射功能。
最终， 在集合 A，和集合 C内的小区或小区簇上发射 eMBMS业务。
当打开集合 C内小区或小区簇上 eMBMS业务的方式功能的同时，需要兼 顾发射功率， 或出于其它考虑， 需要进行有条件的打开， 这时， 可以设置一个 门限值， 设其为 Kb, 以限制集合 C内的某一小区 c， 其邻区中有 Kb或 Kb个 以上的小区属于集合 A，时， 集合 C内的小区 c才打开 eMBMS业务的发射功 能。 当 Kb=l时， 即为前面提到的， 将统计得到的小区或小区簇与辅助小区或 辅助小区簇设为发送 eMBMS业务的 SFN Area,图 8-1示出了 Kb=l时的情况。 当 Kb大于 1 , 例如 Kb=2, 集合 C中的任一小区， 其邻区中有两个或两个以 上属于 A，时， 集合 C中的该小区才打开发射功能， 图 8-2示出了 Kb=2时的情 况。
当 Kb为 2或是大于 2的值时，如果存在以下情况：终端在小区 d的边缘， 另一侧为邻小区 e， d打开 eMBMS发射功能， e小区属于 C类小区， 且 e小 区的邻区中只有 d小区属于 A，， 则按照前述处理方法， e小区不打开 eMBMS 发射功能。 但是， 当终端检测到 e小区的信号很强时， 将 e小区的发射功能打 开是很有利于该终端在 d小区边缘获得宏分集增益的。在已有的 SFN技术中， 激活态 （Activate ) 的 UE检测到的同频信号是要上报到网络侧的。 这种情况 下， 网络侧可以根据 UE上报的邻小区中 C类小区的导频信号强度， 当其大于 阔值时， 打开该邻区的发射功能。 该阔值可以预先设定， 例如可以为 UE当前 所在小区导频信道的接收信号强度，或者是网络中设定的切换时的邻小区信号 强度， 或者是其它值。 如果上述 e小区属于一个小区簇， 则打开该所述的小区 簇的发射功能。
由上可知，该门限值 Kb可以设置默认值为 1， 并可以根据需要更改其值， 并且当改置大于 1时还可根据邻小区中 C类小区信号强度做进一步修正。 由以上本发明实施例提供的方法， 统计存在该终端的小区或小区簇， 并通 过计算其所有邻小区或邻小区簇得到辅助小区或辅助小区簇，将满足预定条件 的辅助小区或辅助小区簇与统计得到的小区或小区簇一同配置为单频网络域， 这样， 可以实现动态的配置单频网络域， 并能保证当 UE位于小区或小区簇的 边缘时， 使用最少的辅助小区或小区簇获取宏分集增益， 从而保证了这些 UE 的接收质量， 并可以节省无线资源和传输资源。
以下介绍本发明的装置的实施例。 图 9示出了该装置实施例的框图。
如图所示的确定单频网络域的装置，包括广播多播业务相关小区或小区簇 获取单元 910， 辅助小区或小区簇确定单元 920， 单频网络域确定单元 930， 其中，
广播多播业务相关小区或小区簇获取单元 910 , 用于获取存在订阅广播多 播业务的终端的小区或小区簇；
辅助小区或小区簇确定单元 920, 用于确定与所述存在订阅广播多播业务 终端的小区或小区簇相邻且不存在订阅广播多播业务终端的小区或小区簇； 单频网络域确定单元 930, 用于将所述广播多播业务相关小区或小区簇确 定单元 910统计的小区或小区簇，与辅助小区或小区簇计算单元 920中得到的 且满足预定条件的辅助小区或辅助小区簇， 一同确定为单频网络域。
所述广播多播业务相关小区或小区簇确定单元 910 包括通知返回确认信 息单元 911 , 初始化单元 912， 接收和统计单元 913， 其中， 当统计的是小区 时，
通知返回确认信息单元 911，用于订阅广播多播业务的终端返回确认信息； 初始化单元 912, 将所有小区的确认统计初始化为 "有，，； 或将所有小区 的确认统计初始化为 "无"；
接收和统计单元 913，用于接收终端返回的确认信息，并在初始化单元 912 操作的基础上， 将收到确认的终端所在的小区设置为 "有"， 统计这些 "有" 的小区为订阅广播多播业务的终端的小区； 或， 接收终端返回的确认信息， 并 将收到确认的终端所在的小区设置为 "有"， 统计这些 "有" 的小区为订阅广 播多播业务的终端的小区； 当统计的为小区簇时，
通知返回确认信息单元 911， 用于通知订阅广播多播业务的终端返回确认 信息；
初始化单元 912， 用于将所有小区的确认统计初始化为 "有，，， 并将所有 小区簇的确认统计初始化为 "有，，； 或，将所有小区的确认统计初始化为 "无，，， 并将所有小区簇的确认统计初始化为 "无"；
接收和统计单元 913，用于接收终端返回的确认信息，并在初始化单元 912 操作的 ^5出上， 将未收到确认的终端所在的小区设置为 "无"， 当小区簇内所 有小区的确认统计为 "无" 时， 设置该小区簇的确认统计为 "无"， 统计仍为 "有"的小区簇为订阅广播多播业务的终端的小区簇； 或， 将未收到确认的终 端所在的小区设置为 "有"， 当小区簇内所有小区的确认统计为 "无" 时， 设 置该小区簇的确认统计为 "有"， 统计这些 "有" 的小区簇为订阅广播多播业 务的终端的小区簇。
所述辅助小区或小区簇确定单元 920 包括邻小区或邻小区簇确定单元 921 , 集合求差单元 922， 其中，
邻小区或邻小区簇确定单元 921 , 用于由所述广播多播业务相关小区或小 区簇统计单元 910确定的小区或小区簇的得到所有邻小区或邻小区簇；
集合求差单元 922, 用于将由邻小区或邻小区簇计算单元 921确定的邻小 区或邻小区簇构成的集合，与由所述广播多播业务相关小区或小区簇统计单元 910确定的小区或小区簇构成的集合求差， 并将结果记为辅助小区或辅助小区 簇。
所述单频网络域确定单元 930包括门限值设定单元 931， 辅助小区与辅助 小区簇条件选取单元 932， 配置单元 933， 其中，
门限值设定单元 931， 用于预先设定一个门限值；
辅助小区与辅助小区簇条件选取单元 932， 用于在辅助小区或辅助小区簇 具有的邻小区或邻小区簇中，将不小于门限值数目的、属于所述确定存在订阅 广播多播业务的终端的小区或小区簇选取为辅助小区或辅助小区簇；
配置单元 933 , 用于将所述广播多播业务相关小区或小区簇确定单元 910 确定的小区或小区簇，与辅助小区与辅助小区簇条件选取单元 932中选取的辅 助小区或辅助小区簇， 一同配置为单频网络域。
利用本发明装置实施例实现动态配置 SFN Area的方法与前述方法类似， 在此不再赘述。

Claims

权 利 要 求
1、 一种确定单频网络域的方法， 其特征在于， 包括：
获取存在订阅广播多播业务终端的小区或小区簇；
确定与所述存在订阅广播多播业务终端的小区或小区簇相邻且不存在订 阅广播多播业务终端的小区或小区簇， 并记为辅助小区或辅助小区簇；
选取满足预定条件的辅助小区或辅助小区簇 ,将其与存在订阅广播多播业 务终端的小区或小区簇一同确定为单频网络域。
2、 如权利要求 1所述的方法， 其特征在于， 所述获取存在订阅广播多播 业务终端的小区具体包括：
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "有"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "无，，， 统计仍为 "有" 的小区为订阅广播多播业务的终端的小区； 或，
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "无 "；
接收终端返回的确认信息， 将收到确认的终端所在的小区设置为 "有，，， 统计这些 "有" 的小区为订阅广播多播业务的终端的小区。
3、 如权利要求 1所述的方法， 其特征在于， 所述统计存在订阅广播多播 业务终端的小区簇由以下方式实现：
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "有"； 将所有小区簇的确认统计初始化为 "有"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "无"； 当小区簇内所有小区的确认统计为 "无"时，设置该小区簇的确认统计为 "无'，； 统计仍为 "有" 的小区簇为订阅广播多播业务的终端的小区簇； 或，
通知订阅广播多播业务的终端返回确认信息；将所有小区的确认统计初始 化为 "无"； 将所有小区簇的确认统计初始化为 "无"；
接收终端返回的确认信息，将未收到确认的终端所在的小区设置为 "有"； 当小区簇内所有小区的确认统计为 "无"时，设置该小区簇的确认统计为 "有"； 统计这些 "有" 的小区簇为订阅广播多播业务的终端的小区簇。
4、 如权利要求 2或 3所述的方法， 其特征在于， 所述通知订阅广播多播 业务的终端返回确认信息由以下方式实现：
采用接入概率因子通知订阅广播多播业务的终端返回确认信息。
5、 如权利要求 1所述的方法， 其特征在于， 所述确定与存在订阅广播多 播业务终端的小区或小区簇相邻且不存在订阅广播多播业务终端的小区或小 区簇由以下方式实现：
确定所述存在订阅广播多播业务终端的小区或小区簇的所有邻小区或邻 小区簇，将其构成的集合与所述获取的存在订阅广播多播业务的小区或小区簇 构成的集合求差。
6、 如权利要求 1所述的方法， 其特征在于， 所述选取满足预定条件的辅 助小区或辅助小区簇由以下方式实现：
当辅助小区或辅助小区簇具有的邻小区或邻小区簇中，有不小于预先设定 的门 P艮值数目个属于所述统计存在订阅广播多播业务的终端的小区或小区簇 时， 选取该辅助小区或辅助小区簇。
7、 如权利要求 6所述的方法， 其特征在于， 进一步包括：
当存在导频信号强度大于阔值的辅助小区或辅助小区簇时，增加选取该辅 助小区或辅助小区簇。
8、 如权利要求 6所述的方法， 其特征在于， 当门限值为 1时， 所述选取 辅助小区或辅助小区簇由以下方式实现：
选取所有辅助小区或辅助小区簇。
9、 一种确定单频网络域的装置， 其特征在于， 包括广播多播业务相关小 区或小区簇获取单元（910 ), 辅助小区或小区簇确定单元（920 ), 单频网络域 确定单元 ( 930 )， 其中，
广播多播业务相关小区或小区簇获取单元（ 910 ) , 用于获取存在订阅广播 多播业务的终端的小区或小区簇；
辅助小区或小区簇确定单元（ 920 ), 用于确定与所述存在订阅广播多播业 务终端的小区或小区簇相邻且不存在订阅广播多播业务终端的小区或小区簇； 单频网络域确定单元（930 ), 用于将所述广播多播业务相关小区或小区簇 确定单元（910 )统计的小区或小区簇， 与辅助小区或小区簇计算单元（920 ) 中得到的且满足预定条件的辅助小区或辅助小区簇， 一同确定为单频网络域。
10、如权利要求 9所述的装置， 其特征在于， 所述广播多播业务相关小区 或小区簇确定单元（ 910 )包括通知返回确认信息单元（ 911 )，初始化单元（ 912 )， 接收和统计单元（913 )， 其中， 当统计的是小区时，
通知返回确认信息单元（911 )， 用于订阅广播多播业务的终端返回确认信 初始化单元（912 )， 将所有小区的确认统计初始化为 "有"； 或将所有小 区的确认统计初始化为 "无"；
接收和统计单元（913 ), 用于接收终端返回的确认信息， 并在初始化单元 ( 912 )操作的基础上， 将收到确认的终端所在的小区设置为 "有"， 统计这些 "有"的小区为订阅广播多播业务的终端的小区； 或， 接收终端返回的确认信 息， 并将收到确认的终端所在的小区设置为 "有"， 统计这些 "有" 的小区为 订阅广播多播业务的终端的小区；
当统计的为小区簇时，
通知返回确认信息单元（911 )， 用于通知订阅广播多播业务的终端返回确 认信息；
初始化单元（912 )， 用于将所有小区的确认统计初始化为 "有，，， 并将所 有小区簇的确认统计初始化为 "有，，；或，将所有小区的确认统计初始化为 "无，，， 并将所有小区簇的确认统计初始化为 "无"；
接收和统计单元（913 )， 用于接收终端返回的确认信息， 并在初始化单元 ( 912 )操作的 上， 将未收到确认的终端所在的小区设置为 "无"， 当小区 簇内所有小区的确认统计为 "无" 时， 设置该小区簇的确认统计为 "无"， 统 计仍为 "有" 的小区簇为订阅广播多播业务的终端的小区簇； 或， 将未收到确 认的终端所在的小区设置为 "有"， 当小区簇内所有小区的确认统计为 "无" 时， 设置该小区簇的确认统计为 "有"， 统计这些 "有" 的小区簇为订阅广播 多播业务的终端的小区簇。
11、 如权利要求 9所述的装置， 其特征在于， 所述辅助小区或小区簇确定 单元（920 ) 包括邻小区或邻小区簇确定单元（921 ), 集合求差单元（922 ), 其中， 邻小区或邻小区簇确定单元（921 ), 用于由所述广播多播业务相关小区或 小区簇统计单元（910 )确定的小区或小区簇的得到所有邻小区或邻小区簇； 集合求差单元（922 ), 用于将由邻小区或邻小区簇计算单元（921 )确定 的邻小区或邻小区簇构成的集合，与由所述广播多播业务相关小区或小区簇统 计单元（910 )确定的小区或小区簇构成的集合求差， 并将结果记为辅助小区 或辅助小区簇。
12、 如权利要求 9 所述的装置， 其特征在于， 所述单频网络域确定单元 ( 930 ) 包括门限值设定单元 （931 ), 辅助小区与辅助小区簇条件选取单元 ( 932 )， 配置单元（933 )， 其中，
门 P艮值设定单元（ 931 ), 用于预先设定门 P艮值；
辅助小区与辅助小区簇条件选取单元（ 932 ),用于在辅助小区或辅助小区 簇具有的邻小区或邻小区簇中，将不小于门限值数目的、属于所述确定存在订 阅广播多播业务的终端的小区或小区簇选取为辅助小区或辅助小区簇；
配置单元（ 933 ), 用于将所述广播多播业务相关小区或小区簇确定单元 ( 910 )确定的小区或小区簇， 与辅助小区与辅助小区簇条件选取单元（932 ) 中选取的辅助小区或辅助小区簇， 一同配置为单频网络域。
PCT/CN2008/070466 2007-03-16 2008-03-11 Method and device for determining single frequency network domain WO2008113286A1 (en)

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