Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/10—Connection setup
  • H04W76/15—Setup of multiple wireless link connections
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/12—Wireless traffic scheduling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W8/00—Network data management
  • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities

Definitions

• Embodiments of the present invention generally relate to wireless communication systems, and more specifically to a method and apparatus for scheduling user equipment in a wireless communication system supporting dual connectivity.
• the low-power node may be a small base station, and its examples include but not limited to low-power base stations such as Pico and Femto.
• 3GPP R12 a new research project "Small Cell Enhancements for E-UTRA and E-UTRAN Higher-layer Aspects" has already been approved, and one focus thereof is to support dual connectivity of a macro cell (a cell covered by a macro base station) layer and a small cell layer.
• a different radio bearer needs to be established to provide service to data with different quality of service (“QoS”)
• QoS quality of service
• UP user plane
• CP Control Plane
• SRB Signaling Radio Bearer
• UE user equipment
• UE will be simultaneously connected to two base stations, wherein one base station may be for example a macro base station and the other base station for example may be a small base station.
• UE radio access capability parameters refer to UE-category and parameters independent of the field UE-category (including UE supported Packet Data Convergence Protocol ("PDCP”) parameters, UE supported Radio Link Control (“RLC”) parameters, UE supported physical layer parameters, UE supported RF parameters etc.).
• PDCP Packet Data Convergence Protocol
• RLC Radio Link Control
• the network When UE accesses the network for the first time, the network should acquire UE radio access capability. For example, the network should know UE-category, then it can allocate the suitable radio resources for this UE. Now there are 8 types of UE-category, the following table illustrates Downlink physical layer parameter values set by the field ue-Category. Table 1. Downlink physical layer parameter values set by the field ue-Category
• DL-SCH received spatial transport block bits within a TTI multiplexing in received within a DL transmission time
• TTI TTI
• one UE is Category 5
• its Maximum number of DL-SCH transport block bits received within a TTI is 299552.
• the network cannot transmit more than 299552 bits within a TTI to this UE on account of the processing capability of the UE.
• MAC Medium Access Control
• Fig.l illustrates the UE connected to both the macro base station providing macro cell coverage and the small base station providing small cell coverage, i.e., the UE is in a dual connectivity mode.
• the significant delay (2ms to 60ms one way) of the backhaul link will cause that centralized schedule performed by the MAC cannot be applicable in the dual connectivity scenario. Therefore, it is a feasible scheme to adopt distributed schedule for the UP in the dual connectivity, and now RAN2 is discussing the feasible protocol architecture for dual connectivity.
• Fig. 2 illustrates one type of potential user plane architecture.
• SI interface coming from a core network terminates at the macro base station MeNB, whereas the small base station SeNB, based on Xn interface (or enhanced X2 interface), receives data of one or more DRBs from the MeNB and transmits to the UE via the corresponding RLC, MAC and physical layer (not shown).
• independent MAC is used to perform distributed schedule.
• macro base station or small base station only can assure that resource allocation for its side obeys the restriction due to UE processing capability, macro base station or small base station cannot assure that the total resource allocation for two sides can obey the restriction due to UE processing capability. Under this situation, how to assure UE processing capability is a problem to be solved.
• embodiments of the present invention provide a method and apparatus for scheduling user equipment in a wireless communication system supporting dual connectivity so as to ensure the UE's processing capability in the case of dual connectivity, avoid transmission overload for the UE and implement reasonable and efficient schedule of the UE.
• a method for scheduling user equipment in a wireless communication system supporting dual connectivity wherein the user equipment remains connected to both of two base stations in the dual connectivity, the two base stations include a macro base station and a small base station.
• the method comprises sending a dual connectivity setup request message from the macro base station to the small base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the small base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the method further comprises enabling the macro base station to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the information related to the user equipment capability comprises at least one item of capability information of information related to category of the user equipment, information about whether the user equipment supports simultaneous transmission in the dual connectivity, and information about whether the user equipment supports simultaneous reception in the dual connectivity.
• the information related to the user equipment capability comprises at least one of the following items:
• a number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of downlink bit rates of the data radio bearers established for the UE, or a sum of downlink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously receive the downlink data from the macro base station and the small base station;
• a number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of uplink bit rates of the data radio bearers established for the UE, or a sum of uplink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously transmit uplink data to the macro base station and the small base station;
• the method further comprises receiving from the UE an indication indicating that the received Downlink-Shared Channel transport block bits exceed the maximum number, the indication being carried in a radio resource control signaling or media access control layer control information element, and reducing amount of data transmitted to the UE based on the indication.
• the method further comprises transmitting a radio resource control connection reconfiguration message to the UE so that the UE is accessed to the small base station.
• a method for scheduling user equipment in a wireless communication system supporting dual connectivity wherein the user equipment remains connected to both of two base stations in the dual connectivity, the two base stations include a macro base station and a small base station.
• the method comprises receiving a dual connectivity setup request message from the macro base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the macro base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the method further comprises enabling the small base station to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the information related to the user equipment capability comprises at least one item of capability information of information related to category of the user equipment, information about whether the user equipment supports simultaneous transmission in the dual connectivity, and information about whether the user equipment supports simultaneous reception in the dual connectivity.
• the information related to the user equipment capability comprises at least one of the following items:
• a number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of downlink bit rates of the data radio bearers established for the UE, or a sum of downlink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously receive the downlink data from the macro base station and the small base station;
• a number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of uplink bit rates of the data radio bearers established for the UE, or a sum of uplink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously transmit uplink data to the macro base station and the small base station;
• the method further comprises receiving from the UE an indication indicating that the received Downlink-Shared Channel transport block bits exceed the maximum number, the indication being carried in a media access control layer control information element, and reducing amount of data transmitted to the UE based on the indication.
• the small base station using the information to perform resource schedule for the UE in the connectivity with the UE comprises the small base station allocating transmission resource for the UE based on the information.
• an apparatus for scheduling user equipment in a wireless communication system supporting the dual connectivity wherein the user equipment remains connected to both of two base stations in the dual connectivity, the two base stations include a macro base station and a small base station, the apparatus comprises a transmitting unit configured to transmit a dual connectivity setup request from the macro base station to the small base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the small base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the apparatus further comprises a scheduling unit configured to enable the macro base station to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• an apparatus for scheduling user equipment in a wireless communication system supporting the dual connectivity wherein the user equipment remains connected to both of two base stations in the dual connectivity, the two base stations include a macro base station and a small base station, the apparatus comprises a receiving unit configured to receive a dual connectivity setup request from the macro base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the macro base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the apparatus further comprises a scheduling unit configured to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the above apparatus of the present invention may comprise various units for implementing the previous aspects and performing steps of the methods of the embodiments.
• Fig.1 illustrates a wireless communication system supporting the dual connectivity to which an embodiment of the present invention may be applied
• Fig.2 illustrates a diagram of a possible protocol stack arrangement in the case of dual connectivity
• Fig.3 illustrates a flow chart of a method for scheduling user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention
• Fig.4 illustrates a flow chart of a method for scheduling user equipment in a wireless communication system supporting the dual connectivity according to another embodiment of the present invention
• Fig.5 illustrates a signaling diagram of scheduling the user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention
• Fig.6 illustrates a block diagram of an apparatus for scheduling user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention
• Fig.7 illustrates a block diagram of an apparatus for scheduling user equipment in a wireless communication system supporting the dual connectivity according to another embodiment of the present invention.
• Embodiments of the present invention provide several feasible solutions to assure the user equipment processing capability in the dual connectivity.
• MeNB Micro eNB, also called macro base station
• MeNB should inform SeNB (Small eNB, also called small base station) of information related to the user equipment capability.
• SeNB Small eNB, also called small base station
• the small base station obtains the information related to the user equipment capability, it can reasonably allocate resources to the user equipment after considering the user equipment capability to avoid excessive transmission from the macro base station and small base station for the user equipment and resultant transmission fault in the case of dual connectivity.
• Fig.3 illustrates a flow chart of a method 300 for scheduling user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention, wherein the user equipment remains connected to two base stations in the dual connectivity, the two base stations include a macro base station (e.g., macro base station shown in Fig.1 and MeNB shown in Fig.2) and a small base station (e.g., small base station shown in Fig.l and SeNB shown in Fig.2).
• a macro base station e.g., macro base station shown in Fig.1 and MeNB shown in Fig.2
• a small base station e.g., small base station shown in Fig.l and SeNB shown in Fig.2
• a dual connectivity setup request message is sent from macro base station sends to the small base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the small base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the macro base station is enabled to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• a main purpose of the message is to set up the dual connectivity so that the macro base station sends necessary parameters to the small base station by virtue of the message, for example, various parameters such as DRB parameter to be offloaded to the small base station will be discussed below.
• the information related to the user equipment capability comprises at least one item of capability information of information related to category of the user equipment, information about whether the user equipment supports simultaneous transmission in the dual connectivity, and information about whether the user equipment supports simultaneous reception in the dual connectivity.
• the information related to category here may for example comprise the category information shown in Table 1 and maximum information related to the category.
• the information related to the user equipment capability comprises at least one of the following items: maximum number of Uplink-Shared Channel transport block bits transmitted within a transmission time interval and maximum number of Downlink-Shared Channel transport block bits received within a transmission time interval.
• the macro base station and the small base station both perform independent schedule for the user equipment.
• TTI Transmission Time Interval
• the macro base station or the small base station should obey this restriction. Hence, this parameter should be directly notified to the small base station;
• the value may be a proportion value (e.g., between 0% and 100%) so that the macro base station and the small base station both may use a portion of all software channel bits;
• the value may be a proportion value (e.g., between 0% and 100%) so that a reasonable number of uplink data may be transmitted to the macro base station and the small base station respectively according to the proportion value; a value set according to the maximum number of Downlink-Shared Channel transport block bits received within the transmission time interval when the UE can simultaneously receive the downlink data from the macro base station and the small base station, wherein the value may be a proportion value (e.g., between 0% and 100%) so that the macro base station and small base station may reasonably transmit data to the UE according to the proportion value.
• the number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of downlink bit rates of the data radio bearers established for the UE, or a sum of downlink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously receive the downlink data from the macro base station and the small base station; the number of data radio bearers established for the UE, or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of uplink bit rates of the data radio bearers established for the UE, or a sum of uplink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously transmit uplink data to the macro base station and the small base station; and the UE's category information.
• the method 300 further comprises receiving from the UE an indication indicating that the received Downlink-Shared Channel transport block bits exceed the maximum number, the indication being carried in a radio resource control signaling or media access control layer control information element, and reducing amount of data transmitted to the UE based on the indication.
• the indication being carried in a radio resource control signaling or media access control layer control information element, and reducing amount of data transmitted to the UE based on the indication.
• Fig.4 illustrates a flow chart of a method 400 for scheduling user equipment in a wireless communication system supporting the dual connectivity according to another embodiment of the present invention, wherein the user equipment remains connected to two base stations in the dual connectivity, the two base stations include a macro base station (e.g., macro base station shown in Fig.1 and MeNB shown in Fig.2) and a small base station (e.g., small base station shown in Fig.l and SeNB shown in Fig.2).
• a macro base station e.g., macro base station shown in Fig.1 and MeNB shown in Fig.2
• a small base station e.g., small base station shown in Fig.l and SeNB shown in Fig.2
• a dual connectivity setup request message from the macro base station is received, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the small base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the method 400 further comprises enabling the small base station to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the information related to the user equipment capability comprises at least one item of capability information of information related to category of the user equipment, information about whether the user equipment supports simultaneous transmission in the dual connectivity, and information about whether the user equipment supports simultaneous reception in the dual connectivity.
• the information related to the user equipment capability comprises at least one of the following items: a maximum number of Uplink-Shared Channel transport block bits transmitted within a transmission time interval;
• the value may be a proportion value so that the macro base station and the small base station both may use a portion of all software channel bits
• the value is for example a proportion value so that both the macro base station and small base station may reasonably transmit data to the UE according to the proportion value;
• the number of data radio bearers established for the UE or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of downlink bit rates of the data radio bearers established for the UE, or a sum of downlink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously receive the downlink data from the macro base station and the small base station; the number of data radio bearers established for the UE, or the number of data radio bearers which are established for the UE and not offloaded to the small base station, or a sum of uplink bit rates of the data radio bearers established for the UE, or a sum of uplink bit rates of the data radio bearers which are established for the UE and not offloaded to the small base station, when the UE can simultaneously transmit uplink data to the macro base station and the small base station; and the UE's category information.
• the method 400 further comprises receiving from the UE an indication indicating that the received Downlink-Shared Channel transport block bits exceed the maximum number, the indication being carried in a media access control layer control information element, and reducing amount of data transmitted to the UE based on the indication.
• the small base station using the information to perform resource schedule for the UE in the connectivity with the UE comprises the small base station allocating transmission resource for the UE based on the information.
• the small base station may reasonably allocate resource and implement schedule for the UE so as to ensure that the UE efficiently transmits data in the case of dual connectivity.
• the macro base station may for example comprise the following exemplary various information or information combinations in the dual connectivity setup request: Complete UE capability information, including the UE's category and capability information about whether the UE supports simultaneous reception or simultaneous transmission.
• the UE's category may be represented by the maximum bit number of a single data packet (received from the downlink shared channel, the same hereunder) received within a TTI and a maximum bit number received within a TTI and a maximum bit number of a single data packet (transmitted at the uplink shared channel, the same hereunder) transmitted within a TTI and a maximum bit number transmitted within a TTI and total number of downlink soft channel bits.
• the small base station schedules resources for the UE according to the maximum value. If the UE supports simultaneous reception or simultaneous transmission, the small base station schedules resources for the UE according to the maximum value, or obtains useable UE capability information by the following method so as to schedule resources for the UE according to the useable UE capability information;
• Complete UE capability information and useable UE capability information allocated to the small base station for example, the maximum bit number received within a TTI and the maximum bit number transmitted in a TTI and total number of downlink soft channel bits. The values of these parameters are all smaller than the maximum value corresponding to the UE's category.
• the small base station uses the useable UE capability information allocated to the small base station to allocate transmission (uplink or downlink) resources for the UE.
• the small base station determines a maximum number of physical resource blocks that may be allocated to the UE according to the maximum bit number transmitted within a TTI, and the small base station may select part or all of the maximum number of physical resource blocks that may be allocated to the UE to transmit data to the UE;
• Useable UE capability information allocated to the small base station for example the maximum bit number of a single data packet received within a TTI and a maximum bit number received within a TTI and a maximum bit number of a single data packet transmitted within a TTI and a maximum bit number transmitted within a TTI and total number of downlink soft channel bits.
• the small base station uses the useable UE capability information allocated to the small base station to allocate transmission (uplink or downlink) resources for the UE.
• the useable UE capability information may be represented by a proportion value in a range of 0 to 1, for example, 0.6. After receiving the proportion value, the small base station obtains useable UE capability information by the following method.
• the maximum bit number received within a TTI the maximum bit number received within a TTI and corresponding to the UE's category x0.6.
• Other parameters such as the maximum bit number transmitted within a TTI or total number of downlink soft channel bits all requires the maximum value corresponding to the UE's category to multiply the proportion value so as to obtain the UE capability information that may be used by the small base station.
• the proportion value may be set uniformly or set respectively. For example, a proportion value is set for the maximum bit number received within a TTI, and another proportion value is set for the maximum bit number transmitted within a TTI;
• Complete UE capability information the number of all data radio bearers ("DRBs") established by the UE, or quality of service parameter (including uplink and downlink bit rates) of all DRBs established by UE, the number of DRBs established by the UE and served by the macro cell (in the DRBs established by the UE, some are offloaded to the small cell and served by the small cell; the remaining DRBs are not offloaded to the small cell and served by the macro cell), or quality of service parameter established by UE and served by the macro cell.
• the small base station obtains useable UE capability information.
• the bit rate may be the maximum bit rate or guaranteed bit rate. Being carried in the dual connectivity setup request, the small base station knows the number of DRBs established by the UE, offloaded to the small cell and served by the small cell and corresponding quality of service parameter. Some DRBs do not ensure the requirement of the bit rate or maximum bit rat. The small base station may not consider these DRBs upon making statistics of the sum of the uplink and downlink bit rates, or use a fixed value such as lOOOOObit/s to represent.
• the UE may send an indication to the macro base station or small base station to indicate that the number of allocated resources exceeds the UE's processing capability. After receiving the indication, the macro base station or small base station will correspondingly reduce the data transmission amount for the UE.
• the radio resource control RRC signaling, or media access control layer control information element MAC CE may be used to send the instruction to the macro base station. If the UE sends the indication to the small base station, the media access control layer control information element MAC CE may be used to send the indication to the small base station. As far as this aspect is concerned, it is necessary to enhance RRC signaling or MAC CE and set a dedicated information element to represent this indication.
• Fig.5 illustrates a signaling diagram of scheduling the user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention.
• the UE is initially only accessed to the macro cell covered by the macro base station, so that the UE has a RRC connection with the macro cell.
• the macro base station may know the information related to the UE's capability from a mobility management entity ("MME") or the UE.
• MME mobility management entity
• UE belongs to category 5, its Maximum number of DL-SCH transport block bits received within a TTI is 299552; its Maximum number of bits of a DL-SCH transport block received within a TTI is 149776 and its Total number of soft channel bits is 3667200.
• Macro cell becomes a primary cell ("PCell") for the UE.
• PCell primary cell
• Macro cell determines whether to configure small cell for dual connectivity for the UE based on UE capability and radio condition. This step may involve collecting measurement report sent by the UE, and selecting a suitable small base station from candidate small base stations for dual connectivity for the UE.
• Macro base station sends the dual connectivity setup request to the small base station.
• the request may include information related to the UE capability, for example, various information described previously with reference to Fig.3 and Fig.4.
• the dual connectivity setup request here may include the DRB information offloaded to the small cell.
• the request may for example include:
• Solution 2 For the dual connectivity, some DRBs are offloaded to the small base station; other DRBs are still served by the macro base station.
• Solution 3 the macro base station and the small base station perform individual schedule for UE according to the maximum value. Once the UE detects that transport block bits exceed this maximum value, it sends one indicator to the macro base station or the small base station so that the macro base station or the small base station can reduce its transmitting bit rate. If UE cannot simultaneously receive downlink data from the macro base station and the small base station, maximum number of DL-SCH transport block bits received within a TTI for this UE should be included in the dual connectivity setup request. For total number of soft channel bits for downlink, the macro base station and the small base station only can utilize part of the total number of soft channel bits. The above solutions for maximum number of DL-SCH transport block bits when UE can simultaneously receive downlink data from the macro base station and the small base station can be applicable for this.
• small base station allocates necessary resource for the offloaded DRBs.
• the small cell should store UE's capability particularly UE processing capability information. Then the small cell sends a response to the macro cell.
• the macro base station sends RRC connection reconfiguration to UE, which is used to inform the UE of resource configuration used by it in the small cell.
• the UE accesses the small cell according to the reconfiguration message.
• the macro base station may use an activation command to activate the small cell.
• UE accesses the small cell simultaneously, UE establishes the dual connectivity.
• the macro base station and the small base station will perform distributed schedule for this UE. Because the above mechanism is introduced, UE processing capability according to the present invention can be assured.
• Fig.6 illustrates a block diagram of an apparatus 600 for scheduling user equipment in a wireless communication system supporting the dual connectivity according to an embodiment of the present invention. As shown in Fig.6, the apparatus 600 is used to schedule the UE in the wireless communication system supporting the dual connectivity, wherein the wireless communication system comprises UE and two base stations connected with the UE, and the two base stations comprise a macro base station and a small base station.
• the apparatus 600 comprises a transmitting unit configured to transmit a dual connectivity setup request from the macro base station to the small base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the small base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the apparatus 600 further comprises a scheduling unit 602 configured to enable the macro base station to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment. It can be seen that the apparatus 600 of Fig.6 can implement the method 300 shown in Fig.3, and although not further shown, the apparatus 600 may comprise more functional units to implement a plurality of embodiments described with reference to the method 300. Furthermore, the apparatus 600 may be implemented at the macro base station or in the macro base station.
• Fig.7 illustrates a block diagram of an apparatus 700 for scheduling user equipment in a wireless communication system supporting the dual connectivity according to another embodiment of the present invention.
• the apparatus 700 is used to schedule the UE in the wireless communication system supporting the dual connectivity, wherein the wireless communication system comprises UE and two base stations both connected with the UE, and the two base stations comprise a macro base station and a small base station.
• the apparatus 700 comprises a receiving unit 701 configured to receive a dual connectivity setup request from the macro base station, wherein the dual connectivity setup request message comprises information related to user equipment capability, and the information is used by the macro base station to perform resource schedule for the user equipment in the connectivity with the user equipment.
• the apparatus 700 further comprises a scheduling unit 702 configured to use the information to perform resource schedule for the user equipment in the connectivity with the user equipment. It can be seen that the apparatus 700 of Fig.7 can implement the method 400 shown in Fig.4, and although not further shown, the apparatus 700 may comprise more functional units to implement a plurality of embodiments described with reference to the method 400. Furthermore, the apparatus 700 may be implemented at the small base station or in the small base station.
• signal bearing medium may be a transmission medium or a recordable medium for computer-readable information, including a magnetic medium, an optical medium, or other suitable medium.
• recordable mediums include: a magnetic disk or floppy disk in a hard disk driver, an optical disk for a CD driver, a magnetic tape, and other medium that can be contemplated by the skilled in the art.
• any communication terminal with an appropriate programming apparatus can implement steps of the method of the present invention as embodied in the program product. It should be noted that in order to make the present invention more comprehensible, the above description omits some more specific technical details which are known to the skilled in the art and may be essential to implement the present invention.

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