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WO2010124462A1 - 扫描方法、系统及终端 - Google Patents

扫描方法、系统及终端 Download PDF

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Publication number
WO2010124462A1
WO2010124462A1 PCT/CN2009/071570 CN2009071570W WO2010124462A1 WO 2010124462 A1 WO2010124462 A1 WO 2010124462A1 CN 2009071570 W CN2009071570 W CN 2009071570W WO 2010124462 A1 WO2010124462 A1 WO 2010124462A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
access technology
coverage
target access
scan
Prior art date
Application number
PCT/CN2009/071570
Other languages
English (en)
French (fr)
Inventor
许明霞
王萦明
唐春梅
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN200980147439.4A priority Critical patent/CN102239715B/zh
Priority to PCT/CN2009/071570 priority patent/WO2010124462A1/zh
Publication of WO2010124462A1 publication Critical patent/WO2010124462A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • Embodiments of the present invention relate to the field of mobile communications technologies, and in particular, to a scanning method, system, and terminal. Background technique
  • the access network device can respectively send the coverage indication information of the network of another access technology to all the terminals in the cell according to the coverage of the next access technology of the network of the other access technology, and the terminal The network of another access technology may be scanned according to the received coverage indication information to determine whether it is possible to switch to another access technology network.
  • the inventors have found that at least the following problems exist in the prior art: when the access network device sends the coverage indication information of the network of another access technology to the cell at the boundary of the overlapping coverage area, The scanning of the network of another access technology by the terminal not covered by the network of another access technology in the above-mentioned cell leads to waste of power consumption of the terminal; when the access network device approaches the cell at the boundary of the overlapping coverage area When the coverage indication information of the network without another access technology is delivered, the terminal located in the above-mentioned cell covered by the network of another access technology does not scan the network of another access technology, resulting in the terminal.
  • Loss of the opportunity to switch to a better network when the access network device sends the coverage indication information of the network without another access technology to the cell at the boundary of the overlapping coverage area, and the neighboring area of the cell is not Covered by the network of the currently served access technology, when the terminal located in the above cell moves to the neighboring area of the cell, there is no access technology of the current service.
  • the network serves the terminal, and does not scan the network of another access technology, causing the terminal to drop the network, affecting the communication quality; since the terminals located in the overlapping coverage area are simultaneously received according to the If the coverage indication information of the network of another access technology is scanned for the network of another access technology, if the network information scanned by the multiple terminals meets the handover condition, the multiple terminals may initiate the handover request at the same time. As a result, the sudden increase of the network load and the increase of the access delay affect the communication quality.
  • Embodiments of the present invention provide a scanning method, a system, and a terminal, which are used to save power consumption of a terminal in a cell located at a boundary of an overlapping coverage area of two networks, and prevent a terminal in a cell located at a boundary of an overlapping coverage area of two networks from losing handover to a more
  • the increase in delay increases the quality of communication.
  • An embodiment of the present invention provides a scanning method, including:
  • the network of the target access technology is scanned according to the scanning decision information.
  • the embodiment of the invention further provides a terminal, including:
  • a first identifying module configured to determine, according to the received coverage indication information, that a cell part to which the terminal belongs is covered by a network of the target access technology
  • a random module configured to generate scan decision information according to a coverage value of the network coverage of the target access technology indicated by the coverage indication information
  • the first scanning module when the scanning time of the network for the target access technology comes, scans the network of the target access technology according to the scanning decision information.
  • the embodiment of the invention further provides a scanning system, comprising:
  • a first access network device configured to send coverage indication information, where the coverage indication information indicates a coverage value of the network covered by the target access technology
  • the first terminal is configured to determine, according to the received coverage indication information that is sent by the first access network device, that the cell part to which the first terminal belongs is covered by the network of the target access technology, according to the coverage indication information
  • the indicated cell is generated by the coverage value of the network coverage of the target access technology to generate scan decision information, and when the scan time of the network of the target access technology comes, the target access is performed according to the scan decision information.
  • the technical network is scanned.
  • An embodiment of the present invention provides another scanning method, including: Determining, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology;
  • the network of the target access technology is scanned.
  • the embodiment of the invention further provides another terminal, including:
  • a second identifying module configured to determine, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology
  • a second obtaining module configured to generate scan decision information that scans a network of the target access technology according to the scan information indicated by the coverage indication information, where the cell is indicated according to the coverage indication information a coverage value of the network coverage of the target access technology, and a scan period of the network of the target access technology;
  • the second scanning module scans the network of the target access technology when a scanning moment of the network for the target access technology arrives.
  • Another embodiment of the present invention provides another scanning system, including:
  • a second access network device configured to send coverage indication information, where the coverage indication information indicates a coverage value of the network covered by the target access technology
  • a second terminal configured to determine, according to the received coverage indication information that is sent by the second access network device, that the cell part to which the second terminal belongs is covered by the network of the target access technology, according to the coverage indication information
  • the indicated scan information generates scan decision information for scanning the network of the target access technology, according to the coverage value of the network covered by the target access technology indicated by the coverage indication information, The scanning period of the network of the target access technology, when the scanning time of the network of the target access technology comes, scanning the network of the target access technology.
  • the coverage indication information sent by the access network device in the embodiment of the present invention indicates that the cell to which the terminal belongs is covered by the network coverage of the target access technology, or is the coverage.
  • the existence of the probability value enables the terminal to generate scan decision information according to the coverage value, and scans the network of the target access technology according to the scan decision information when the scan time comes, thereby saving the boundary of the overlapping coverage area between the two networks.
  • the power consumption of the terminal in the cell avoids the opportunity for the terminal in the cell located at the boundary of the overlapping coverage area of the two networks to lose the handover to a better network, and avoids the terminal moving to the cell located at the boundary of the overlapping coverage area of the two networks to
  • the network is disconnected in the neighboring area that is not covered by the network of the currently served access technology, and the sudden increase of the load and the access of the network caused by the terminal in the cell in the overlapping coverage area of the two networks simultaneously initiating the handover request are avoided.
  • the increase of the delay increases the communication quality.
  • the coverage indication information sent by the access network device indicates that the cell to which the terminal belongs is covered by the network coverage of the target access technology, or the probability value of the coverage existence.
  • FIG. 1 is a schematic flowchart of a scanning method according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic flowchart of a scanning method according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic flowchart of a scanning method according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic flowchart of a scanning method according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural diagram of a terminal according to Embodiment 5 of the present invention.
  • FIG. 6 is a schematic structural diagram of a scanning system according to Embodiment 6 of the present invention.
  • FIG. 7 is a schematic flowchart diagram of another scanning method according to Embodiment 7 of the present invention
  • FIG. 8 is a schematic flowchart of another scanning method according to Embodiment 8 of the present invention
  • FIG. 9 is a schematic flowchart of another scanning method according to Embodiment 9 of the present invention.
  • FIG. 10 is a schematic structural diagram of another terminal according to Embodiment 10 of the present invention.
  • FIG. 11 is a schematic structural diagram of another scanning system according to Embodiment 11 of the present invention. detailed description
  • FIG. 1 is a schematic flowchart of a scanning method according to Embodiment 1 of the present invention. As shown in FIG. 1 , the scanning method in this embodiment may include the following steps:
  • Step 101 Determine, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology
  • Step 102 Generate scan decision information according to the coverage value of the network coverage of the target access technology indicated by the coverage indication information.
  • Step 103 When the scanning time of the network of the target access technology arrives, scan the network of the target access technology according to the foregoing scanning decision information.
  • the scanning time in this embodiment may be the scanning time in the event triggering, or may be the scanning time in the scanning period.
  • the coverage indication information in the embodiment is sent by the access network device in the network that is currently serving the source access technology to the terminal, and the coverage indication information can indicate that the cell to which the terminal belongs is covered by the network of the target access technology.
  • Coverage value The terminal may determine, according to the upper cover value, that the cell to which the cell belongs is covered by the network of the target access technology, and if the cell part is covered by the network of the target access technology, when the scanning time of the network of the target access technology arrives.
  • the terminal randomly generates a scan decision message according to the above coverage value, and the larger the coverage value, the greater the probability of scanning. For example: “1" means scanning, "0” means no scanning, the larger the coverage value, the greater the probability of randomly generating "1", and vice versa.
  • the terminal scans the network of the target access technology according to the randomly generated scan decision information, thereby saving power consumption of the terminal in the cell located at the boundary of the overlapping coverage area of the two networks, and avoiding
  • the terminal in the cell located at the boundary of the overlapping coverage area of the two networks loses the opportunity to switch to a better network, avoiding the terminal in the cell located at the boundary of the overlapping coverage area of the two networks moving to the access technology that is not currently served.
  • the network is disconnected in the neighboring area of the network, which avoids the sudden increase of the network load and the increase of the access delay caused by the terminal in the cell in the overlapping coverage area of the two networks simultaneously increasing the communication quality. .
  • the scanning method of this embodiment can be applied to the scanning scene of any two networks during the switching process.
  • CDMA Code-Division Multiple Access
  • HRPD High Rate Packet Data
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • LTE Long Term Evolution
  • the following embodiments of the present invention take the scenario of the coexistence of the E-UTRAN and the HRPD network as an example, for example, the coverage vertical overlap scene of the two networks and the coverage level intersection scenario of the two networks, and the idle state switching and the active state switching pre-scanning process, wherein Idle state switching is also referred to as cell reselection.
  • Idle state switching is also referred to as cell reselection.
  • the terminal currently resides in a cell covered by an HRPD network (source access technology), and the terminal determines whether to scan the E-UTRAN according to the coverage indication information of the cell covered by the HRPD network. Access technology) coverage of the cell.
  • FIG. 2 is a schematic flowchart of a scanning method according to Embodiment 2 of the present invention. As shown in FIG. 2, the scanning method in this embodiment may include the following steps:
  • Step 201 The terminal determines, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the E-UTRAN.
  • the coverage indication information may be added to the E-UTRAN of the overlapping coverage of the cell by adding 1 to N bits of supplemental bits in the prior art, where N is an integer greater than or equal to 1.
  • the coverage indication information may indicate the coverage of the cell by the E-UTRAN in two forms: a. Form 1
  • the coverage indication information includes a scan bit and a supplement bit of at least one bit, the scan bit and at least one
  • the supplemental bit of the bit indicates the coverage value that the cell is covered by the E-UTRAN, and the coverage value is a number between 0 and 1.
  • the supplemental bits are combined with the original scan bits (e.g., one bit of scan bits) to indicate the coverage value that the cell is covered by the E-UTRAN, such that there are a total of N+1 bits to indicate coverage. If all is 1, it means that the cell is all covered by E-UTRAN; if it is all 0, it means that the whole cell is not covered by E-UTRAN; if it is the number between all 0s and all 1, the cell is indicated Probability of being covered by E-UTRAN.
  • the above values and their meanings are defined in reverse.
  • the 00 cell is not covered by the E-UTRAN as a whole.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value of the cell covered by the E-UTRAN.
  • the coverage indication information includes a scan bit indicating whether the cell is covered by the E-UTRAN. If the scan bit indicates that the cell is covered by the E-UTRAN, the coverage indication information further includes at least one bit of the supplement bit, the at least one The supplemental bit of the bit indicates the coverage value that the cell is covered by the E-UTRAN, and the coverage value is a number between 0 and 1.
  • the scan bit is all 0s, it means that the whole cell is not covered by the E-UTRAN. In this case, it is not necessary to combine with the supplementary bit to indicate the coverage value of the cell covered by the E-UTRAN; 1 , this case requires a supplemental bit to indicate the coverage value of the cell covered by the E-UTRAN, such that there are N bits to indicate the coverage: If the supplemental bit is all 1, it means that the cell is all covered by E-UTRAN If it is a number between all 0s or all 0s and all 1s, the probability that the cell is covered by the E-UTRAN is explained. Of course, the above values and their meanings are defined in reverse.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value covered by the E-UTRAN while indicating whether the cell is covered by the E-UTRAN.
  • Step 202 The terminal acquires a scan period of the preset E-UTRAN.
  • Step 203 When the scanning time of the E-UTRAN arrives, the terminal generates scan decision information according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information.
  • the method for generating the scan decision information by the terminal according to the coverage value covered by the E-UTRAN indicated by the coverage indication information may be various, and only one of them is introduced here:
  • the terminal generates a uniformity between 0 and 1. Distributed random number;
  • scan decision information for scanning is generated; and if the random number is greater than the coverage value, scan decision information that is not scanned is generated. For example: “1" is the scanning decision information for scanning, indicating scanning; "0" is scanning judgment information for not scanning, indicating no scanning.
  • the coverage covered by the E-UTRAN is large, the probability of randomly generating scan decision information for scanning will be correspondingly increased, and vice versa.
  • Step 204 The terminal scans the E-UTRAN according to the foregoing scan decision information.
  • the terminal if the terminal generates the scan decision information that does not perform scanning according to the foregoing coverage indication information, the terminal does not need to perform the scanning operation on the E-UTRAN; if the terminal generates the scan decision information for scanning according to the coverage indication information, Then the terminal performs a scanning operation on the E-UTRAN.
  • the access network device in the currently served HRPD network sends the coverage to the terminal.
  • the indication information indicates the coverage value of the cell to which the terminal belongs is covered by the E-UTRAN.
  • the terminal may determine, according to the upper cover value, that the cell to which it belongs is covered by the E-UTRAN. If the cell part is covered by the E-UTRAN, when the acquired scanning time of the E-UTRAN arrives, the terminal according to the foregoing coverage The value randomly generates a scan decision message.
  • the terminal scans the E-UTRAN according to the randomly generated scan decision information, which saves power consumption of the terminal in the cell located at the boundary of the overlapping coverage area of the two networks, and avoids the cell located in the boundary of the overlapping coverage area of the two networks.
  • the terminal loses the opportunity to switch to a better network, avoiding the terminal moving in the cell located at the boundary of the overlapping coverage area of the two networks to the network that is not covered by the currently served HRPD network, and avoiding being located in the two networks.
  • the sudden increase of the load of the network and the increase of the access delay caused by the terminal in the cell of the overlapping coverage area simultaneously initiating the handover request improves the communication quality.
  • FIG. 3 is a schematic flowchart of a scanning method according to Embodiment 3 of the present invention. As shown in FIG. 3, the scanning method in this embodiment may include the following steps:
  • Step 301 The terminal determines, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the E-UTRAN.
  • the coverage indication information may be added to the E-UTRAN of the overlapping coverage of the cell by adding 1 to N bits of supplemental bits in the prior art, where N is an integer greater than or equal to 1.
  • the coverage indication information may indicate the coverage of the cell by the E-UTRAN in two forms: a. Form 1
  • the coverage indication information includes a scan bit and a supplemental bit of at least one bit, the scan bit and the supplemental bit of at least one bit indicating a coverage value of the cell covered by the E-UTRAN, the coverage value being a number between 0 and 1.
  • the supplemental bits are combined with the original scan bits (e.g., one bit of scan bits) to indicate the coverage value that the cell is covered by the E-UTRAN, such that there are a total of N+1 bits to indicate coverage. If all is 1, it means that the cell is all covered by E-UTRAN; if it is all 0, it means that the whole cell is not covered by E-UTRAN; if it is the number between all 0s and all 1, the cell is indicated Probability of being covered by E-UTRAN.
  • the above values and their meanings are defined in reverse.
  • N there are four indication states for the scan bit + the supplement bit, which can be 11, 10, 01, 00 respectively.
  • the four indication states are as follows: 11 cells are all covered by E-UTRAN;
  • the 00 cell is not covered by the E-UTRAN as a whole.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value of the cell covered by the E-UTRAN.
  • the coverage indication information includes a scan bit indicating whether the cell is covered by the E-UTRAN. If the scan bit indicates that the cell is covered by the E-UTRAN, the coverage indication information further includes at least one bit of the supplement bit, the at least one The supplemental bit of the bit indicates the coverage value that the cell is covered by the E-UTRAN, and the coverage value is a number between 0 and 1.
  • the scan bit is 1, it indicates that the cell is completely covered by the E-UTRAN. In this case, it is not necessary to combine with the supplemental bit to indicate the coverage value of the cell covered by the E-UTRAN; if the scan bit is 0 In this case, a supplementary bit is needed to indicate the coverage value of the cell covered by the E-UTRAN, so that there are a total of N bits to indicate the coverage condition: if the supplementary bit is all 0, it means that the whole cell is not covered by the E-UTRAN. If the supplemental bits are other values in the range of the range (all 1s or all 0s and all 1s), then the probability that the cell is covered by the E-UTRAN is indicated. Of course, the above values and their meanings are defined in reverse.
  • the 0 00 cell is not covered by the E-UTRAN as a whole.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value covered by the E-UTRAN while indicating whether the cell is covered by the E-UTRAN.
  • Step 302 The terminal acquires a scan period of the E-UTRAN according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information.
  • the scanning period of E-UTRAN in this step includes three scanning configuration parameters: PreMaskDuration, MaskDuration, and PostMaskDuration.
  • One scanning cycle is the above three.
  • the sum of the durations of the parameters, and finally only the MaskDuration is used to scan the network of access technologies other than the HRPD network, and the other two parts are used to work in the HRPD network.
  • the start time of the scan cycle is the start time of the MaskDuration. Scan time.
  • different coverage values may respectively correspond to different sets of preset scan configuration parameters, and may also correspond to a preset set of expressions for calculating scan configuration parameters, as long as the terminal in the cell with low coverage value can be guaranteed.
  • the scan period is large.
  • the coverage value of the cell covered by E-UTRAN is X.
  • the scanning configuration parameters of the three E-UTRANs in this step can be expressed as follows:
  • PreMaskDu ration is 1/X * 2 ⁇ ⁇ , the unit is the time slot;
  • MaskDuration sets constants that are independent of the coverage value, for example: 2 time slots.
  • K can be adjusted so that the value of "PreMaskDuration+PostMaskDuration+MaskDuration" is a multiple of the scan period T or the scan period T; if there is no provision in the E-UTRAN The scan period T, then K can be adjusted according to other constraints.
  • the scanning configuration parameter of the E-UTRAN in this step is a set of values or expressions corresponding to the coverage value covered by the E-UTRAN indicated by the coverage indication information.
  • the terminal receives the coverage indication information sent by the access network device in the HRPD network that is currently served, the corresponding scanning configuration parameter is obtained according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information to ensure The scan period is short at high coverage values and long on low coverage values.
  • Step 303 When the scanning time of the E-UTRAN arrives, the terminal generates scanning decision information according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information.
  • step 203 For a description of this step, refer to the related description of step 203 in the second embodiment of the present invention.
  • Step 304 The terminal scans the E-UTRAN according to the foregoing scan decision information.
  • the terminal if the terminal generates the scan decision information that does not perform scanning according to the foregoing coverage indication information, the terminal does not need to perform the scanning operation on the E-UTRAN; if the terminal generates the scan decision information for scanning according to the coverage indication information, Then the terminal goes to E-UTRAN Line scan operation.
  • the shortest broadcast value that is, the coverage indication information (about less than 8 bits) delivered by the access network device is replaced by the third broadcast configuration parameter in the prior art.
  • a total of 48 bits of the negotiated value saves the bit overhead.
  • the length and scan period of scanning other networks in each scan period can be changed at the same time, and the negotiated value in the prior art scheme can only be used to determine Scanning the length of other networks during each scan cycle cannot be used to determine the scan period, increasing flexibility.
  • the scanning method in this embodiment may include the following steps:
  • Step 401 The terminal determines, according to the received coverage indication information, that the cell part to which the terminal belongs is
  • step 201 in the second embodiment of the present invention and step 301 in the third embodiment of the present invention.
  • Step 402 The terminal acquires a scan period of the E-UTRAN according to the coverage value and the number of scans that the cell is covered by the E-UTRAN indicated by the coverage indication information.
  • the terminal can determine the scan period of each scan (the scan may fail for some reason) according to the coverage value and the number of scans that have been performed between an initial scan period and a maximum scan period, and the scan period of each scan described above is A function that covers the value and the number of scans that have been made.
  • the initial scan period is 2T
  • the maximum scan period is 20T
  • the scan time is ⁇
  • the scan period is 8 ⁇ , and so on. If it fails, the scan period is increased to 20 ⁇ .
  • Step 403 When the scanning time of the E-UTRAN arrives, the terminal generates scan decision information according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information.
  • step 203 For a description of this step, refer to the related description of step 203 in the second embodiment of the present invention.
  • Step 404 The terminal scans the E-UTRAN according to the foregoing scan decision information.
  • the terminal if the terminal generates a scan that does not perform scanning according to the foregoing coverage indication information. The decision information, then the terminal does not need to perform scanning operation on the E-UTRAN; if the terminal generates scan decision information for scanning according to the above coverage indication information, the terminal performs a scanning operation on the E-UTRAN.
  • the terminal adopts the step-by-step retreat processing mode to obtain the scanning period of the E-UTRAN, and the scanning interval of the scanning period is gradually increased, which reduces the probability of the terminal scanning failure, thereby saving power consumption of the terminal.
  • the terminal may perform the adjustment, including but not limited to the scanning time or the scanning period, according to the coverage indication information of the E-UTRAN broadcasted by the access network device in the HRPD network, and the terminal may also use the information to control some other two.
  • Inter-operation between networks of multiple access technologies for example: redirection from HRPD network to E-UTRAN
  • the implementation is similar to the embodiment of the present invention, that is, the terminal is easy to initiate redirection in case of high coverage, and vice versa.
  • the terminal may further cooperate with the attribute parameters of some terminals, for example: the access level of the terminal, so that the terminal with the high access level obtains a higher random number detection probability value, and vice versa. Also.
  • FIG. 5 is a schematic structural diagram of a terminal according to Embodiment 5 of the present invention.
  • the terminal in this embodiment may include a first identification module 51, a random module 52, and a first scanning module 53.
  • the first identification module 51 determines, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology, and when the scanning time of the network of the target access technology comes, the random module 52 according to the coverage indication information.
  • the indicated cell is generated by the coverage value of the network coverage of the target access technology to generate scan decision information, and the first scanning module 53 scans the network of the target access technology according to the scan decision information.
  • the method of the first embodiment of the present invention, the terminal in the second embodiment of the present invention, and the third embodiment of the present invention The functions of the terminal and the terminal in the fourth embodiment of the present invention can be implemented by a terminal provided in this embodiment.
  • the coverage indication information received by the first identification module is sent by the access network device in the network of the currently served source access technology to the terminal, and the coverage indication information can indicate that the cell to which the terminal belongs is targeted.
  • the first identification module may determine, according to the foregoing coverage value, that the cell to which the cell belongs is covered by the network of the target access technology. If the cell part is covered by the network of the target access technology, the random module randomly generates one according to the coverage value. Scan decision information, for example: "1" means scan, "0" means no scan, the larger the coverage value, the greater the probability of randomly generating "1", and vice versa.
  • the first scanning module scans the network of the target access technology according to the randomly generated scanning decision information, thereby saving the cell located at the boundary of the overlapping coverage area of the two networks.
  • the power consumption of the internal terminal avoids the opportunity for the terminal in the cell located at the boundary of the overlapping coverage area of the two networks to switch to a better network, and avoids the terminal in the cell located at the boundary of the overlapping coverage area of the two networks.
  • the network is disconnected in the neighboring area covered by the network of the currently accessed access technology, which avoids a sudden increase in the load of the network and the access delay caused by the terminal in the cell in the overlapping coverage area of the two networks simultaneously initiating the handover request. The increase has improved the quality of communication.
  • the terminal in this embodiment may further include a first acquiring module (not shown) for pre-acquiring the scanning period of the network of the target access technology.
  • FIG. 6 is a schematic structural diagram of a scanning system according to Embodiment 6 of the present invention.
  • the scanning system of this embodiment may include a first access network device 61 and a first terminal 62.
  • the first access network device 61 is configured to send coverage indication information, where the coverage indication information indicates a coverage value of the network coverage by the target access technology of the foregoing cell;
  • the first terminal 62 is configured to determine, according to the received coverage indication information sent by the first access network device, that the cell part to which the first terminal 62 belongs is covered by the network of the target access technology, and the network of the target access technology is scanned.
  • the cell indicated by the coverage indication information is generated by the coverage value of the network coverage of the target access technology, and the network of the target access technology is scanned according to the scan decision information.
  • the foregoing method of the first embodiment of the present invention, the terminal in the second embodiment of the present invention, the terminal in the third embodiment of the present invention, and the terminal in the fourth embodiment of the present invention can all be provided by the scanning system provided by this embodiment.
  • the first terminal 62 in the system is implemented.
  • the first terminal 62 of the embodiment may further acquire a scan period of the network of the target access technology in advance.
  • FIG. 7 is a schematic flowchart of another scanning method according to Embodiment 7 of the present invention. As shown in FIG. 7, the scanning method in this embodiment may include the following steps:
  • Step 701 Determine, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology
  • Step 702 Generate, according to the scan information indicated by the coverage indication information, scan decision information that scans the network of the target access technology, and according to the coverage indication information, the coverage value of the network covered by the target access technology indicated by the coverage indication information. Obtaining a scanning period of the network of the target access technology;
  • Step 703 When the scanning time of the network of the target access technology comes, the network of the target access technology is scanned.
  • the coverage indication information in the embodiment is sent by the access network device in the network that is currently serving the source access technology to the terminal, and the coverage indication information can indicate that the cell to which the terminal belongs is covered by the network of the target access technology. Coverage value. If the terminal generates the scan decision information for scanning the network of the target access technology according to the scan information indicated by the coverage indication information, the terminal may obtain the scan period of the network of the target access technology according to the coverage value to ensure the coverage value. The lower the scan time, the longer the scan period. The terminal scans the network of the target access technology according to the acquired scanning period, saves the power consumption of the terminal in the cell located at the boundary of the overlapping coverage area of the two networks, and avoids the cell located at the boundary of the overlapping coverage area of the two networks.
  • the intra-terminal terminal loses the opportunity to switch to a better network, avoiding the intra-cell terminal located at the boundary of the overlapping coverage area of the two networks moving to a neighboring area that is not covered by the network of the currently-served access technology, avoiding the network.
  • the communication quality is improved due to a sudden increase in the load of the network and an increase in the access delay caused by the terminals in the cells in the overlapping coverage areas of the two networks simultaneously initiating the handover request.
  • the scanning method of this embodiment can be applied to a scanning scenario of any two networks during the switching process.
  • some of the world's leading CDMA/HRPD operators have decided to gradually upgrade from the existing HRPD network to the E-UTRAN of LTE.
  • E-UTRAN partially covers, HRPD Full coverage, some end users need to use HRPD-LTE dual mode terminal for roaming throughout the network.
  • the following embodiments of the present invention take the scenario of the coexistence of the E-UTRAN and the HRPD network as an example, for example, the coverage vertical overlap scene of the two networks and the coverage level intersection scenario of the two networks, and the idle state switching and the active state switching pre-scanning process, wherein Idle state switching is also referred to as cell reselection.
  • Idle state switching is also referred to as cell reselection.
  • the terminal currently resides in a cell covered by an HRPD network (source access technology), and the terminal determines whether to scan the E-UTRAN according to the coverage indication information of the cell covered by the HRPD network. Access technology) coverage of the cell.
  • FIG. 8 is a schematic flowchart of another scanning method according to Embodiment 8 of the present invention. As shown in FIG. 8, the scanning method in this embodiment may include the following steps:
  • Step 801 The terminal determines, according to the received coverage indication information, that the cell part to which the terminal belongs is
  • the coverage indication information may be added to the E-UTRAN of the overlapping coverage of the cell by adding 1 to N bits of supplemental bits in the prior art, where N is an integer greater than or equal to 1.
  • the coverage indication information may indicate the coverage of the cell by the E-UTRAN in two forms: a. Form 1
  • the coverage indication information includes a scan bit and a supplemental bit of at least one bit, the scan bit and the supplemental bit of at least one bit indicating a coverage value of the cell covered by the E-UTRAN, the coverage value being a number between 0 and 1.
  • the supplemental bits are combined with the original scan bits (e.g., one bit of scan bits) to indicate the coverage value that the cell is covered by the E-UTRAN, such that there are a total of N+1 bits to indicate coverage. If all is 1, it means that the cell is all covered by E-UTRAN; if it is all 0, it means that the whole cell is not covered by E-UTRAN; if it is the number between all 0s and all 1, the cell is indicated Probability of being covered by E-UTRAN.
  • the above values and their meanings are defined in reverse.
  • 01 cell part 1/3 is covered by E-UTRAN;
  • the 00 cell is not covered by the E-UTRAN as a whole.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value of the cell covered by the E-UTRAN.
  • the coverage indication information includes a scan bit indicating whether the cell is covered by the E-UTRAN. If the scan bit indicates that the cell is covered by the E-UTRAN, the coverage indication information further includes at least one bit of the supplement bit, the at least one The supplemental bit of the bit indicates the coverage value that the cell is covered by the E-UTRAN, and the coverage value is a number between 0 and 1.
  • the scan bit is 1, it indicates that the cell is completely covered by the E-UTRAN. In this case, it is not necessary to combine with the supplemental bit to indicate the coverage value of the cell covered by the E-UTRAN; if the scan bit is 0 In this case, a supplementary bit is needed to indicate the coverage value of the cell covered by the E-UTRAN, so that there are a total of N bits to indicate the coverage condition: if the supplementary bit is all 0, it means that the whole cell is not covered by the E-UTRAN. If the supplemental bits are other values in the range of the range (all 1s or all 0s and all 1s), then the probability that the cell is covered by the E-UTRAN is indicated. Of course, the above values and their meanings are defined in reverse.
  • the 0 00 cell is not covered by the E-UTRAN as a whole.
  • the access network device in the cell covered by the HRPD network of the terminal may indicate the coverage value covered by the E-UTRAN while indicating whether the cell is covered by the E-UTRAN.
  • Step 802 If the terminal generates scan decision information for scanning the E-UTRAN according to the scan information indicated by the coverage indication information (that is, the scan information indicated by the scan bit), the terminal is configured according to the coverage indication information.
  • the coverage value of the E-UTRAN coverage acquires the scan period of the E-UTRAN, and the scan period includes scanning the scan time of the E-UTRAN and scanning the scan time of the HRPD network;
  • the scanning period of E-UTRAN in this step includes three scanning configuration parameters: PreMaskDuration, MaskDuration, and PostMaskDuration. One scanning cycle is the above three.
  • the sum of the durations of the parameters, and finally only the MaskDuration is used to scan the network of access technologies other than the HRPD network, and the other two parts are used to work in the HRPD network.
  • the start time of the scan cycle is the start time of the MaskDuration. Scan time.
  • different coverage values may respectively correspond to different sets of preset scan configuration parameters, and may also correspond to a preset set of expressions for calculating scan configuration parameters, as long as the terminal in the cell with low coverage value can be guaranteed.
  • the scan period is large.
  • the coverage value of the cell covered by E-UTRAN is X.
  • the scanning configuration parameters of the three E-UTRANs in this step can be expressed as follows:
  • PreMaskDu ration is 1/X * 2 ⁇ ⁇ , the unit is the time slot;
  • MaskDuration sets constants that are independent of the coverage value, for example: 2 time slots.
  • K can be adjusted so that the value of "PreMaskDuration+PostMaskDuration+MaskDuration" is a multiple of the scan period T or the scan period T; if there is no provision in the E-UTRAN The scan period T, then K can be adjusted according to other constraints.
  • the scanning configuration parameter of the E-UTRAN in this step is a set of values or expressions corresponding to the coverage value covered by the E-UTRAN indicated by the coverage indication information.
  • the terminal receives the coverage indication information sent by the access network device in the HRPD network that is currently served, the corresponding scanning configuration parameter is obtained according to the coverage value of the cell covered by the E-UTRAN indicated by the coverage indication information to ensure The scan period is short at high coverage values and long on low coverage values.
  • Step 803 When the scanning time of the E-UTRAN arrives, the E-UTRAN is scanned.
  • the shortest broadcast value that is, the coverage indication information (about less than 8 bits) delivered by the access network device is replaced by the third broadcast configuration parameter in the prior art.
  • a total of 48 bits of negotiated value saves bit overhead; in this embodiment, the length and scanning period of scanning other networks in each scanning period can be changed at the same time, so that the lower the coverage value, the shorter the scanning time, and the scanning The longer the period, the negotiated value in the prior art scheme can only be used to determine the length of scanning other networks in each scanning period, and cannot be used to determine the scanning period. Great flexibility.
  • FIG. 9 is a schematic flowchart of another scanning method according to Embodiment 9 of the present invention. As shown in FIG. 9, the scanning method in this embodiment may include the following steps:
  • Step 901 The terminal determines, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the E-UTRAN.
  • step 801 in Embodiment 8 of the present invention For a description of this step, refer to the related description of step 801 in Embodiment 8 of the present invention.
  • Step 902 If the terminal generates scan decision information for scanning the E-UTRAN according to the scan information indicated by the coverage indication information (that is, the scan information indicated by the scan bit), the terminal is configured according to the coverage indication information.
  • the coverage value and the number of scans covered by the E-UTRAN acquire the scan period of the E-UTRAN;
  • the terminal can determine the scan period of each scan (the scan may fail for some reason) according to the coverage value and the number of scans that have been performed between an initial scan period and a maximum scan period, and the scan period of each scan described above is A function that covers the value and the number of scans that have been made.
  • the initial scan period is 2T
  • the maximum scan period is 20T
  • the scan time is ⁇
  • the scan period is 8 ⁇ , and so on. If it fails, the scan period is increased to 20 ⁇ .
  • Step 903 When the scanning time of the E-UTRAN arrives, the E-UTRAN is scanned.
  • the terminal adopts the step-by-step retreat processing mode to obtain the scanning period of the E-UTRAN, and the scanning interval of the scanning period is gradually increased, which reduces the probability of the terminal scanning failure, thereby saving power consumption of the terminal.
  • FIG. 10 is a schematic structural diagram of another terminal according to Embodiment 10 of the present invention.
  • the terminal in this embodiment may include a second identification module 1001, a second obtaining module 1002, and a second scanning module 1003.
  • the second identification module 1001 determines, according to the received coverage indication information, that the cell part to which the terminal belongs is covered by the network of the target access technology.
  • the second obtaining module 1002 generates the target according to the scan information indicated by the coverage indication information.
  • the scanning decision information of the network of the access technology is obtained, and the scanning period of the network of the target access technology is obtained according to the coverage value of the network coverage of the target access technology indicated by the coverage indication information, and the scanning period is The scan time of the network that scans the target access technology and the scan time of the network that scans the source access technology; the second scan module 1003, when the scan time of the network of the target access technology comes, the network of the target access technology Scan.
  • the coverage indication information received by the second identification module is sent by the access network device in the network of the currently served source access technology to the terminal, and the coverage indication information can indicate that the cell to which the terminal belongs is targeted.
  • the second identification module may determine, according to the foregoing coverage value, that the cell to which the cell belongs is covered by the network of the target access technology, and if the cell part is covered by the network of the target access technology, if the second acquiring module is configured according to the coverage indication information
  • the scanning information generated by the scan information of the target access technology is generated, and the scan period of the network of the target access technology is obtained according to the coverage value to ensure that the lower the coverage value, the shorter the scan time. , the longer the scan period.
  • the second scanning module scans the network of the target access technology when the scanning time of the network of the target access technology arrives according to the scanning period acquired by the second acquiring module, thereby saving the boundary of the overlapping coverage area of the two networks.
  • the power consumption of the terminal in the small area avoids the opportunity for the terminal in the cell located at the boundary of the overlapping coverage area of the two networks to switch to a better network, and avoids the terminal moving to the cell in the cell located at the boundary of the overlapping coverage area of the two networks.
  • the network is dropped in the neighboring area covered by the network of the currently served access technology, which avoids the sudden increase of the load of the network and the access time caused by the terminal in the cell in the overlapping coverage area of the two networks simultaneously initiating the handover request.
  • the increase in delay has improved the quality of communication.
  • FIG. 11 is a schematic structural diagram of another scanning system according to Embodiment 11 of the present invention, as shown in FIG. 11 As shown, the scanning system of this embodiment may include a second access network device 1101 and a second terminal 1102. among them:
  • a second access network device 1101 configured to send coverage indication information, where the coverage indication information indicates a coverage value of the network coverage by the target access technology of the foregoing cell;
  • the second terminal 1102 is configured to determine, according to the received coverage indication information that is sent by the second access network device 1101, that the cell part to which the second terminal 1102 belongs is covered by the network of the target access technology, according to the coverage indication information.
  • the indicated scan information generates scan decision information for scanning the network of the target access technology, and the target access technology is obtained according to the coverage value of the network covered by the target access technology indicated by the coverage indication information.
  • the scan period of the network includes the scan time of the network scanning the target access technology and the scan time of the network of the scan source access technology. When the scan time of the network of the target access technology comes, the target is connected. Scan into the technology network.
  • the foregoing method in the seventh embodiment of the present invention, the terminal in the eighth embodiment of the present invention, and the function in the terminal in the ninth embodiment of the present invention can be implemented by the second terminal 1102 in another scanning system provided by this embodiment.

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Description

扫描方法、 系统及终端 技术领域
本发明实施例涉及移动通信技术领域， 特别涉及扫描方法、 系统及终端。 背景技术
两种不同接入技术且不同覆盖范围的网络同时存在于系统中时， 例如： 两网的覆盖垂直相叠场景和两网的覆盖水平相交场景， 会存在两网的交叠覆 盖区域。 接入网络设备能够分别根据另一种接入技术的网络对其下每个小区 的覆盖情况向该小区中的全部终端下发是否存在另一种接入技术的网络的覆 盖指示信息， 终端则可以根据接收到的上述覆盖指示信息对另一种接入技术 的网络进行扫描， 以确定是否能够切换到另一种接入技术的网络。
在实现本发明过程中， 发明人发现现有技术中至少存在如下问题： 当接 入网络设备向交叠覆盖区域边界的小区下发存在另一种接入技术的网络的覆 盖指示信息时， 位于上述小区内并未被另一种接入技术的网络覆盖的终端对 另一种接入技术的网络的扫描则导致了终端功耗的浪费； 当接入网络设备向 交叠覆盖区域边界的小区下发未存在另一种接入技术的网络的覆盖指示信息 时， 位于上述小区内被另一种接入技术的网络覆盖的终端没有对另一种接入 技术的网络进行扫描则导致了终端失去了切换到更好的网络的机会； 当接入 网络设备向交叠覆盖区域边界的小区下发未存在另一种接入技术的网络的覆 盖指示信息时，且该小区的邻近区域并未被当前服务的接入技术的网络覆盖， 位于上述小区内的终端移动到该小区的邻近区域时， 既没有当前服务的接入 技术的网络服务于该终端， 又没有对另一种接入技术的网络进行扫描， 导致 了终端的掉网， 影响了通信质量； 由于位于交叠覆盖区域小区内的终端是同 时根据所接收到的另一种接入技术的网络的覆盖指示信息对另一种接入技术 的网络进行扫描的， 若存在多个终端扫描到的网络信息均符合切换条件， 上 述多个终端将同时发起切换请求， 导致了网络的负载突然增加和接入时延的 增加， 影响了通信质量。 发明内容
本发明实施例提供扫描方法、 系统及终端， 用以节省位于两网的交叠覆 盖区域边界的小区内终端的功耗， 避免位于两网的交叠覆盖区域边界的小区 内终端失去切换到更好的网络的机会， 避免位于两网的交叠覆盖区域边界的 小区内终端移动到未被当前服务的接入技术的网络覆盖的邻近区域中发生掉 网， 避免网络的负载突然增加和接入时延的增加， 提高通信质量。
本发明实施例提供了一种扫描方法， 包括：
根据接收到的覆盖指示信息， 确定终端所属的小区部分被目标接入技术 的网络覆盖；
根据所述覆盖指示信息所指示的所述小区被所述目标接入技术的网络覆 盖的覆盖值产生扫描判决信息；
所述目标接入技术的网络的扫描时刻到来时， 根据所述扫描判决信息， 对所述目标接入技术的网络进行扫描。
本发明实施例还提供了一种终端， 包括：
第一识别模块， 用于根据接收到的覆盖指示信息， 确定终端所属的小区 部分被目标接入技术的网络覆盖；
随机模块， 用于根据所述覆盖指示信息所指示的所述小区被所述目标接 入技术的网络覆盖的覆盖值产生扫描判决信息；
第一扫描模块， 用于所述目标接入技术的网络的扫描时刻到来时， 根据 所述扫描判决信息， 对所述目标接入技术的网络进行扫描。
本发明实施例再提供了一种扫描系统， 包括：
第一接入网络设备， 用于发送覆盖指示信息， 所述覆盖指示信息指示所 述小区被所述目标接入技术的网络覆盖的覆盖值；
第一终端， 用于根据接收到的所述第一接入网络设备发送的覆盖指示信 息， 确定所述第一终端所属的小区部分被目标接入技术的网络覆盖， 根据所 述覆盖指示信息所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值 产生扫描判决信息， 所述目标接入技术的网络的扫描时刻到来时， 根据所述 扫描判决信息， 对所述目标接入技术的网络进行扫描。
本发明实施例提供了另一种扫描方法， 包括： 根据接收到的覆盖指示信息， 确定终端所属的小区部分被目标接入技术 的网络覆盖；
若根据所述覆盖指示信息所指示的扫描信息产生对所述目标接入技术的 网络进行扫描的扫描判决信息， 根据所述覆盖指示信息所指示的所述小区被 所述目标接入技术的网络覆盖的覆盖值， 获取所述目标接入技术的网络的扫 描周期；
所述目标接入技术的网络的扫描时刻到来时， 对所述目标接入技术的网 络进行扫描。
本发明实施例还提供了另一种终端， 包括：
第二识别模块， 用于根据接收到的覆盖指示信息， 确定终端所属的小区 部分被目标接入技术的网络覆盖；
第二获取模块， 用于若根据所述覆盖指示信息所指示的扫描信息产生对 所述目标接入技术的网络进行扫描的扫描判决信息， 根据所述覆盖指示信息 所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值， 获取所述目标 接入技术的网络的扫描周期；
第二扫描模块， 用于所述目标接入技术的网络的扫描时刻到来时， 对所 述目标接入技术的网络进行扫描。
本发明实施例再提供了另一种扫描系统， 包括：
第二接入网络设备， 用于发送覆盖指示信息， 所述覆盖指示信息指示所 述小区被所述目标接入技术的网络覆盖的覆盖值；
第二终端， 用于根据接收到的所述第二接入网络设备发送的覆盖指示信 息， 确定所述第二终端所属的小区部分被目标接入技术的网络覆盖， 若根据 所述覆盖指示信息所指示的扫描信息产生对所述目标接入技术的网络进行扫 描的扫描判决信息， 根据所述覆盖指示信息所指示的所述小区被所述目标接 入技术的网络覆盖的覆盖值， 获取所述目标接入技术的网络的扫描周期， 所 述目标接入技术的网络的扫描时刻到来时， 对所述目标接入技术的网络进行 扫描。
由上述技术方案可知， 本发明实施例通过接入网络设备下发的覆盖指示 信息指示终端所属的小区被目标接入技术的网络覆盖的覆盖值， 或说是覆盖 存在的概率值， 使得终端能够根据上述覆盖值产生扫描判决信息， 在扫描时 刻到来时， 根据该扫描判决信息对目标接入技术的网络进行扫描， 从而节省 了位于两网的交叠覆盖区域边界的小区内终端的功耗， 避免了位于两网的交 叠覆盖区域边界的小区内终端失去切换到更好的网络的机会， 避免了位于两 网的交叠覆盖区域边界的小区内终端移动到未被当前服务的接入技术的网络 覆盖的邻近区域中发生掉网， 避免了由于位于两网的交叠覆盖区域的小区内 的终端同时发起切换请求而引起的网络的负载突然增加和接入时延的增加， 提高了通信质量； 本发明实施例通过接入网络设备下发的覆盖指示信息指示 终端所属的小区被目标接入技术的网络覆盖的覆盖值， 或说是覆盖存在的概 率值， 使得终端能够根据上述覆盖值获取目标接入技术的网络的扫描周期， 在扫描时刻到来时对目标接入技术的网络进行扫描， 从而节省了位于两网的 交叠覆盖区域边界的小区内终端的功耗， 避免了位于两网的交叠覆盖区域边 界的小区内终端失去切换到更好的网络的机会， 避免了位于两网的交叠覆盖 区域边界的小区内终端移动到未被当前服务的接入技术的网络覆盖的邻近区 域中发生掉网， 避免了由于位于两网的交叠覆盖区域的小区内的终端同时发起 切换请求而引起的网络的负载突然增加和接入时延的增加， 提高了通信质量。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例一提供的一种扫描方法的流程示意图；
图 2为本发明实施例二提供的一种扫描方法的流程示意图；
图 3为本发明实施例三提供的一种扫描方法的流程示意图；
图 4为本发明实施例四提供的一种扫描方法的流程示意图；
图 5为本发明实施例五提供的一种终端的结构示意图；
图 6为本发明实施例六提供的一种扫描系统的结构示意图；
图 7为本发明实施例七提供的另一种扫描方法的流程示意图； 图 8为本发明实施例八提供的另一种扫描方法的流程示意图； 图 9为本发明实施例九提供的另一种扫描方法的流程示意图；
图 10为本发明实施例十提供的另一种终端的结构示意图；
图 11为本发明实施例十一提供的另一种扫描系统的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做 出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
图 1为本发明实施例一提供的一种扫描方法的流程示意图， 如图 1所示， 本实施例的扫描方法可以包括以下步骤：
步骤 101、 根据接收到的覆盖指示信息， 确定终端所属的小区部分被目 标接入技术的网络覆盖；
步骤 102、 根据上述覆盖指示信息所指示的上述小区被目标接入技术的 网络覆盖的覆盖值产生扫描判决信息；
步骤 103、 目标接入技术的网络的扫描时刻到来时， 根据上述扫描判决 信息， 对目标接入技术的网络进行扫描。
本实施例中的扫描时刻可以是事件触发中的扫描时刻， 还可以是扫描周 期中的扫描时刻。
本实施例中的覆盖指示信息是由当前服务的源接入技术的网络中的接入 网络设备向终端发送的， 该覆盖指示信息能够指示出终端所属的小区被目标 接入技术的网络覆盖的覆盖值。 终端可以根据上 隻盖值确定出其所属的小 区被目标接入技术的网络覆盖的情况， 若该小区部分被目标接入技术的网络 覆盖， 那么在目标接入技术的网络的扫描时刻到来时， 终端则根据上述覆盖 值随机产生一扫描判决信息， 覆盖值越大， 进行扫描的几率越大。 例如： "1 " 表示扫描， "0" 表示不扫描， 覆盖值越大， 随机产生出 "1 " 的几率则越大， 反之亦然。 终端根据随机产生的上述扫描判决信息， 对目标接入技术的网络 进行扫描， 节省了位于两网的交叠覆盖区域边界的小区内终端的功耗， 避免 了位于两网的交叠覆盖区域边界的小区内终端失去切换到更好的网络的机 会， 避免了位于两网的交叠覆盖区域边界的小区内终端移动到未被当前服务 的接入技术的网络覆盖的邻近区域中发生掉网， 避免了由于位于两网的交叠 覆盖区域的小区内的终端同时发起切换请求而引起的网络的负载突然增加和 接入时延的增加， 提高了通信质量。
本实施例的扫描方法可以适用于任意两个网络在切换过程中的扫描场 景。 作为下一代主流技术， 目前一些全球领先的码分多址 （ Code-Division Multiple Access, 简称 CDMA ) /高速速率分组数据 ( High rate packet data, 简称 HRPD )运营商决定从现有的 HRPD 网络逐步升级到长期演进（Long Term Evolution , 简称 LTE ) 的演进通用移动通信系统陆地无线接入网 ( Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, 简称 E-UTRAN )。 在网络升级的过程中， 由于同时存在 HRPD和 E-UTRAN两种网络， 其中 E-UTRAN部分覆盖， HRPD完全覆盖， 一些终端用户需要使用 HRPD-LTE双模终端来进行全网络的漫游。
下述本发明实施例以 E-UTRAN和 HRPD网络共存场景为例， 例如： 两 网的覆盖垂直相叠场景和两网的覆盖水平相交场景， 进行空闲态切换和激活 态切换前扫描流程， 其中空闲态切换也称作小区重选。 下述本发明实施例中 均假设终端当前驻留在一个 HRPD网络 (源接入技术 )覆盖的小区内， 该终 端则根据 HRPD网络覆盖的小区的覆盖指示信息来决定是否扫描 E-UTRAN (目标接入技术）覆盖的小区。
图 2为本发明实施例二提供的一种扫描方法的流程示意图， 如图 2所示， 本实施例的扫描方法可以包括以下步骤：
步骤 201、 终端根据接收到的覆盖指示信息确定终端所属的小区部分被 E-UTRAN覆盖；
其中的覆盖指示信息可以在现有技术中的扫描位之外加 1到 N位补充位 来说明该小区交叠覆盖的 E-UTRAN的情况，其中 N为大于或等于 1的整数。 覆盖指示信息可以分别以两种形式指示终端该小区被 E-UTRAN的覆盖情况： a、 形式一
覆盖指示信息包括扫描位和至少一比特的补充位， 上述扫描位和至少一 比特的补充位指示该小区被 E-UTRAN覆盖的覆盖值， 该覆盖值为 0~1之间 的数。
该种形式中， 补充位与原来的扫描位（例如： 一比特的扫描位）合起来 指示该小区被 E-UTRAN覆盖的覆盖值， 这样共有 N+1个比特位来指示覆盖 情况。 如果为全 1 , 则说明该小区全部被 E-UTRAN覆盖； 如果为全 0, 则说 明该小区整个都不被 E-UTRAN覆盖； 如果为全 0与全 1之间的数， 则说明 该小区被 E-UTRAN覆盖的概率。 当然上述取值与其表示的含义反过来定义 也可以。
下面以 N为 1为例， 这时扫描位 +补充位共有 4种指示状态， 分别可以 为 11、 10、 01、 00。 四种指示状态分别表示如下：
11小区全部被 E-UTRAN覆盖；
10小区 2/3部分被 E-UTRAN覆盖；
01小区 1/3部分被 E-UTRAN覆盖；
00小区整个都不被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以指 明该小区被 E-UTRAN覆盖的覆盖值。
b、 形式二
覆盖指示信息包括扫描位，该扫描位指示该小区是否被 E-UTRAN覆盖， 若该扫描位指示该小区被 E-UTRAN覆盖， 那么上述覆盖指示信息还包括至 少一比特的补充位， 上述至少一比特的补充位指示该小区被 E-UTRAN覆盖 的覆盖值， 该覆盖值为 0~1之间的数。
该种形式中， 若扫描位为全 0, 则说明该小区整个都不被 E-UTRAN覆 盖，这种情况下无须与补充位合起来指示该小区被 E-UTRAN覆盖的覆盖值； 若扫描位为 1 , 这种情况需要补充位来指示该小区被 E-UTRAN覆盖的覆盖 值， 这样共有 N个比特位来指示覆盖情况： 如果补充位为全 1 , 则说明该小 区全部被 E-UTRAN覆盖； 如果为全 0或全 0与全 1之间的数， 则说明该小 区被 E-UTRAN覆盖的概率。 当然上述取值与其表示的含义反过来定义也可 以。
下面以 N为 3为例， 这时扫描位和补充位所指示的指示状态分别表示如 下：
0小区整个都不被 E-UTRAN覆盖；
1 111小区全部被 E-UTRAN覆盖；
1 110小区 7/8被 E-UTRAN覆盖；
1 101小区 6/8被 E-UTRAN覆盖；
1 100小区 5/8被 E-UTRAN覆盖；
1 011小区 4/8被 E-UTRAN覆盖；
1 010小区 3/8被 E-UTRAN覆盖；
1 001小区 2/8被 E-UTRAN覆盖；
1 000小区 1/8被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以在 指明该小区是否被 E-UTRAN覆盖的同时，说明被 E-UTRAN覆盖的覆盖值。
步骤 202、 终端获取预先设置的 E-UTRAN的扫描周期；
步骤 203、 E-UTRAN的扫描时刻到来时，终端根据上述覆盖指示信息所 指示的该小区被 E-UTRAN覆盖的覆盖值产生扫描判决信息；
本步骤中， 终端根据覆盖指示信息所指示的该小区被 E-UTRAN覆盖的 覆盖值产生扫描判决信息的方法可以有很多种， 这里只介绍其中的一种： 终端生成一个 0~1之间均匀分布的随机数；
若上述随机数小于或等于上述覆盖值时，产生进行扫描的扫描判决信息； 若上述随机数大于上述覆盖值时， 产生不进行扫描的扫描判决信息。 例如： "1 " 为进行扫描的扫描判决信息， 表示扫描； "0" 为不进行扫描 的扫描判决信息， 表示不扫描。 当被 E-UTRAN覆盖的覆盖率较大时， 则随 机产生进行扫描的扫描判决信息的概率会相应提高， 反之亦然。
步骤 204、 终端根据上述扫描判决信息， 对 E-UTRAN进行扫描。
本实施例中， 如果终端根据上述覆盖指示信息产生出不进行扫描的扫描 判决信息， 那么终端则无须对 E-UTRAN进行扫描操作； 如果终端根据上述 覆盖指示信息产生出进行扫描的扫描判决信息， 那么终端则对 E-UTRAN进 行扫描操作。
本实施例中， 当前服务的 HRPD网络中的接入网络设备向终端发送覆盖 指示信息， 指示出终端所属的小区被 E-UTRAN覆盖的覆盖值。 终端可以根 据上 隻盖值确定出其所属的小区被 E-UTRAN覆盖的情况， 若该小区部分 被 E-UTRAN覆盖， 那么在获取到的 E-UTRAN的扫描时刻到来时， 终端则 根据上述覆盖值随机产生一扫描判决信息。 终端根据随机产生的上述扫描判 决信息， 对 E-UTRAN进行扫描， 节省了位于两网的交叠覆盖区域边界的小 区内终端的功耗， 避免了位于两网的交叠覆盖区域边界的小区内终端失去切 换到更好的网络的机会， 避免了位于两网的交叠覆盖区域边界的小区内终端 移动到未被当前服务的 HRPD网络覆盖的邻近区域中发生掉网， 避免了由于 位于两网的交叠覆盖区域的小区内的终端同时发起切换请求而引起的网络的 负载突然增加和接入时延的增加， 提高了通信质量。
图 3为本发明实施例三提供的一种扫描方法的流程示意图， 如图 3所示， 本实施例的扫描方法可以包括以下步骤：
步骤 301、 终端根据接收到的覆盖指示信息确定终端所属的小区部分被 E-UTRAN覆盖；
其中的覆盖指示信息可以在现有技术中的扫描位之外加 1到 N位补充位 来说明该小区交叠覆盖的 E-UTRAN的情况，其中 N为大于或等于 1的整数。 覆盖指示信息可以分别以两种形式指示终端该小区被 E-UTRAN的覆盖情况： a、 形式一
覆盖指示信息包括扫描位和至少一比特的补充位， 上述扫描位和至少一 比特的补充位指示该小区被 E-UTRAN覆盖的覆盖值， 该覆盖值为 0~1之间 的数。
该种形式中， 补充位与原来的扫描位（例如： 一比特的扫描位）合起来 指示该小区被 E-UTRAN覆盖的覆盖值， 这样共有 N+1个比特位来指示覆盖 情况。 如果为全 1 , 则说明该小区全部被 E-UTRAN覆盖； 如果为全 0, 则说 明该小区整个都不被 E-UTRAN覆盖； 如果为全 0与全 1之间的数， 则说明 该小区被 E-UTRAN覆盖的概率。 当然上述取值与其表示的含义反过来定义 也可以。
下面以 N为 1为例， 这时扫描位 +补充位共有 4种指示状态， 分别可以 为 11、 10、 01、 00。 四种指示状态分别表示如下： 11小区全部被 E-UTRAN覆盖；
10小区 2/3部分被 E-UTRAN覆盖；
01小区 1/3部分被 E-UTRAN覆盖；
00小区整个都不被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以指 明该小区被 E-UTRAN覆盖的覆盖值。
b、 形式二
覆盖指示信息包括扫描位，该扫描位指示该小区是否被 E-UTRAN覆盖， 若该扫描位指示该小区被 E-UTRAN覆盖， 那么上述覆盖指示信息还包括至 少一比特的补充位， 上述至少一比特的补充位指示该小区被 E-UTRAN覆盖 的覆盖值， 该覆盖值为 0~1之间的数。
该种形式中， 若扫描位为 1 , 则说明该小区整个都被 E-UTRAN覆盖， 这种情况下无须与补充位合起来指示该小区被 E-UTRAN覆盖的覆盖值； 若 扫描位为 0, 这种情况需要补充位来指示该小区被 E-UTRAN覆盖的覆盖值， 这样共有 N个比特位来指示覆盖情况： 如果补充位为全 0, 则说明该小区整 个都不被 E-UTRAN覆盖； 如果补充位为值域范围内的其它取值 (全 1或全 0与全 1之间的数）， 则说明该小区被 E-UTRAN覆盖的概率。 当然上述取值 与其表示的含义反过来定义也可以。
下面以 N为 2为例， 这时扫描位和补充位所指示的指示状态分别表示如 下：
1小区全部被 E-UTRAN覆盖；
0 11小区 3/4被 E-UTRAN覆盖；
0 10小区 2/4被 E-UTRAN覆盖；
0 01小区 1/4被 E-UTRAN覆盖；
0 00小区整个都不被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以在 指明该小区是否被 E-UTRAN覆盖的同时，说明被 E-UTRAN覆盖的覆盖值。
步骤 302、 终端根据上述覆盖指示信息所指示的该小区被 E-UTRAN覆 盖的覆盖值获取 E-UTRAN的扫描周期； 本步骤中的 E-UTRAN 的扫描周期包括掩码之前时长长度 ( PreMaskDu ration ), 掩码时长长度（ MaskDuration )、 掩码之后时长长度 ( PostMaskDuration )三个扫描配置参数， 一个扫描周期就是上述三个参数 的时长之和， 最终只有 MaskDuration用来扫描 HRPD网络以外的其它接入 技术的网络， 而另外两部分的用来在 HRPD网络内工作， 扫描周期的起始时 刻即是 MaskDuration的起始时刻即扫描时刻。本实施例中， 不同的覆盖值可 以分别对应不同的一套预先设置的扫描配置参数， 还可以对应一套预先设置 的用于计算扫描配置参数表达式， 只要能够保证覆盖值低的小区中终端的扫 描周期大即可。 例如： 小区被 E-UTRAN覆盖的覆盖值为 X, 本步骤中的三 个 E-UTRAN的扫描配置参数可以表达如下：
PreMaskDu ration为 1/X * 2ΛΚ, 单位为时隙；
PostMaskDuration的设置与上同 （当然也可不同）；
MaskDuration可设置与覆盖值无关的常数， 例如： 2个时隙。
若 E-UTRAN 存在一个规定的扫描周期 T , 则可以调整 K, 以使得 "PreMaskDuration+PostMaskDuration+MaskDuration" 的取值为扫描周期 T或扫描周期 T的倍数即可； 若 E-UTRAN不存在一个规定的扫描周期 T, 那么可以根据其他约束条件调整 K。
本步骤中的 E-UTRAN的扫描配置参数是与覆盖指示信息所指示的该小 区被 E-UTRAN覆盖的覆盖值相对应的一套数值或表达形式。 当终端接收到 来自当前服务的 HRPD网络中的接入网络设备发送的覆盖指示信息时， 根据 该覆盖指示信息所指示的该小区被 E-UTRAN覆盖的覆盖值获取相应的扫描 配置参数， 以确保高覆盖值时扫描周期短， 低覆盖值时扫描周期长。
步骤 303、 E-UTRAN的扫描时刻到来时，终端根据上述覆盖指示信息所 指示的该小区被 E-UTRAN覆盖的覆盖值产生扫描判决信息；
本步骤的说明可以参见本发明实施例二中步骤 203的相关说明。
步骤 304、 终端根据上述扫描判决信息， 对 E-UTRAN进行扫描。
本实施例中， 如果终端根据上述覆盖指示信息产生出不进行扫描的扫描 判决信息， 那么终端则无须对 E-UTRAN进行扫描操作； 如果终端根据上述 覆盖指示信息产生出进行扫描的扫描判决信息， 那么终端则对 E-UTRAN进 行扫描操作。
与现有技术方案中通过协商确定上述三个扫描配置参数相比， 本实施例 中， 用一个较短的广播值即接入网络设备下发的覆盖指示信息 （约小于 8比 特）代替了三个共 48比特位的协商值， 节省了比特开销； 本实施例中， 可以 同时改变每个扫描周期内扫描其它网络的长度和扫描周期， 而现有技术方案 中的协商值只能用来决定每个扫描周期内扫描其它网络的长度， 不能用来决 定扫描周期， 增大了灵活性。
图 4为本发明实施例四提供的一种扫描方法的流程示意图， 如图 4所示， 本实施例的扫描方法可以包括以下步骤：
步骤 401、 终端根据接收到的覆盖指示信息确定终端所属的小区部分被
E-UTRAN覆盖；
本步骤的说明可以参见本发明实施例二中步骤 201和本发明实施例三中 步骤 301的相关说明。
步骤 402、 终端根据上述覆盖指示信息所指示的该小区被 E-UTRAN覆 盖的覆盖值和扫描次数获取 E-UTRAN的扫描周期；
终端在一个初始扫描周期与最大扫描周期之间， 根据覆盖值和已经进行 过的扫描次数可以确定每一次扫描 （扫描可能会因为某些原因失败） 的扫描 周期， 上述每一次扫描的扫描周期即为覆盖值和已经进行过的扫描次数的函 数。 例如： 假设初始扫描周期为 2T, 最大扫描周期为 20T, 在第一个扫描时 刻到来后进行 T时长的第一次扫描，此时扫描周期为 2T;若第一次扫描失败， 则下次于 2T/50%-T = 3T间隔后， 再进行第二次扫描， 扫描时间长度仍为 Τ, 扫描周期则变为 4Τ (扫描时长 Τ+扫描间隔 3T ); 若第二次扫描失败， 则下 次于 4Τ/50%-Τ = 7Τ间隔后， 再进行第三次扫描， 扫描时间长度为 Τ, 扫描 周期则变为 8Τ, 以此类推， 如果一直失败， 则直到扫描周期增大到 20Τ。
步骤 403、 E-UTRAN的扫描时刻到来时，终端根据上述覆盖指示信息所 指示的该小区被 E-UTRAN覆盖的覆盖值产生扫描判决信息；
本步骤的说明可以参见本发明实施例二中步骤 203的相关说明。
步骤 404、 终端根据上述扫描判决信息， 对 E-UTRAN进行扫描。
本实施例中， 如果终端根据上述覆盖指示信息产生出不进行扫描的扫描 判决信息， 那么终端则无须对 E-UTRAN进行扫描操作； 如果终端根据上述 覆盖指示信息产生出进行扫描的扫描判决信息， 那么终端则对 E-UTRAN进 行扫描操作。
本实施例中终端采用了逐步退避的处理方式获取到了 E-UTRAN 的扫描 周期， 该扫描周期的扫描间隔是逐渐增大的， 减少了终端扫描失败的概率， 从而节省了终端的功耗。
需要说明的是： 终端可以根据 HRPD网络中的接入网络设备广播发送的 E-UTRAN 的覆盖指示信息可以进行包括但不限于扫描时刻或者扫描周期的 调整， 终端还可以利用此信息控制一些其它两种或多种接入技术的网络之间 的互操作， 例如： 从 HRPD网络重定向到 E-UTRAN , 实施方式与本发明的 实施例雷同， 即高覆盖情况下终端易发起重定向， 反之亦然。 另外， 终端在 使用该覆盖指示信息时， 还可以进一步地与一些终端的属性参数相配合， 例 如： 终端的接入等级， 使得接入等级高的终端获得较高的随机数检测概率值， 反之亦然。
需要说明的是： 对于前述的各方法实施例， 为了简单描述， 故将其都表 述为一系列的动作组合， 但是本领域技术人员应该知悉， 本发明并不受所描 述的动作顺序的限制， 因为依据本发明， 某些步骤可以采用其他顺序或者同 时进行。 其次， 本领域技术人员也应该知悉， 说明书中所描述的实施例均属 于优选实施例， 所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中， 对各个实施例的描述都各有侧重， 某个实施例中没有 详述的部分， 可以参见其他实施例的相关描述。
图 5为本发明实施例五提供的一种终端的结构示意图， 如图 5所示， 本实 施例的终端可以包括第一识别模块 51、 随机模块 52和第一扫描模块 53。 其 中，第一识别模块 51根据接收到的覆盖指示信息确定终端所属的小区部分被 目标接入技术的网络覆盖， 上述目标接入技术的网络的扫描时刻到来时， 随 机模块 52 根据上述覆盖指示信息所指示的上述小区被上述目标接入技术的 网络覆盖的覆盖值产生扫描判决信息，第一扫描模块 53根据上述扫描判决信 息， 对上述目标接入技术的网络进行扫描。
上述本发明实施例一的方法、 本发明实施例二中终端、 本发明实施例三 中终端和本发明实施例四中终端的功能均可以由本实施例提供的一种终端实 现。
本实施例中第一识别模块所接收到的覆盖指示信息是由当前服务的源接 入技术的网络中的接入网络设备向终端发送的， 该覆盖指示信息能够指示出 终端所属的小区被目标接入技术的网络覆盖的覆盖值。 第一识别模块可以根 据上述覆盖值确定出其所属的小区被目标接入技术的网络覆盖的情况， 若该 小区部分被目标接入技术的网络覆盖， 那么随机模块则根据上述覆盖值随机 产生一扫描判决信息， 例如： "1 "表示扫描， "0"表示不扫描， 覆盖值越大， 随机产生出 "1 " 的几率则越大， 反之亦然。 在目标接入技术的网络的扫描时 刻到来时， 第一扫描模块则根据随机产生的上述扫描判决信息， 对目标接入 技术的网络进行扫描， 节省了位于两网的交叠覆盖区域边界的小区内终端的 功耗， 避免了位于两网的交叠覆盖区域边界的小区内终端失去切换到更好的 网络的机会， 避免了位于两网的交叠覆盖区域边界的小区内终端移动到未被 当前服务的接入技术的网络覆盖的邻近区域中发生掉网， 避免了由于位于两 网的交叠覆盖区域的小区内的终端同时发起切换请求而引起的网络的负载突 然增加和接入时延的增加， 提高了通信质量。
进一步地， 本实施例的终端还可以进一步包括第一获取模块（图中未示 出）， 用于预先获取上述目标接入技术的网络的扫描周期。
图 6为本发明实施例六提供的一种扫描系统的结构示意图， 如图 6所示， 本实施例的扫描系统可以包括第一接入网络设备 61和第一终端 62。 其中： 第一接入网络设备 61 , 用于发送覆盖指示信息， 上述覆盖指示信息指示 上述小区被上述目标接入技术的网络覆盖的覆盖值；
第一终端 62, 用于根据接收到的上述第一接入网络设备发送的覆盖指示 信息确定第一终端 62所属的小区部分被目标接入技术的网络覆盖，上述目标 接入技术的网络的扫描时刻到来时， 根据上述覆盖指示信息所指示的上述小 区被上述目标接入技术的网络覆盖的覆盖值产生扫描判决信息， 根据上述扫 描判决信息， 对上述目标接入技术的网络进行扫描。
上述本发明实施例一的方法、 本发明实施例二中终端、 本发明实施例三 中终端和本发明实施例四中终端的功能均可以由本实施例提供的一种扫描系 统中的第一终端 62实现。
进一步地，本实施例的第一终端 62还可以预先获取上述目标接入技术的 网络的扫描周期。
图 7为本发明实施例七提供的另一种扫描方法的流程示意图，如图 7所示， 本实施例的扫描方法可以包括以下步骤：
步骤 701、 根据接收到的覆盖指示信息， 确定终端所属的小区部分被目 标接入技术的网络覆盖；
步骤 702、 若根据上述覆盖指示信息所指示的扫描信息产生对目标接入 技术的网络进行扫描的扫描判决信息， 根据上述覆盖指示信息所指示的上述 小区被目标接入技术的网络覆盖的覆盖值， 获取目标接入技术的网络的扫描 周期；
步骤 703、 目标接入技术的网络的扫描时刻到来时， 对目标接入技术的 网络进行扫描。
本实施例中的覆盖指示信息是由当前服务的源接入技术的网络中的接入 网络设备向终端发送的， 该覆盖指示信息能够指示出终端所属的小区被目标 接入技术的网络覆盖的覆盖值。 若终端根据上述覆盖指示信息所指示的扫描 信息产生对上述目标接入技术的网络进行扫描的扫描判决信息， 终端可以根 据上述覆盖值获取到目标接入技术的网络的扫描周期， 以保证覆盖值越低， 扫描时间越短， 扫描周期越长。 终端根据所获取的扫描周期， 对目标接入技 术的网络进行扫描， 节省了位于两网的交叠覆盖区域边界的小区内终端的功 耗， 避免了位于两网的交叠覆盖区域边界的小区内终端失去切换到更好的网 络的机会， 避免了位于两网的交叠覆盖区域边界的小区内终端移动到未被当 前服务的接入技术的网络覆盖的邻近区域中发生掉网， 避免了由于位于两网 的交叠覆盖区域的小区内的终端同时发起切换请求而引起的网络的负载突然 增加和接入时延的增加， 提高了通信质量。
本实施例的扫描方法可以适用于任意两个网络在切换过程中的扫描场 景。作为下一代主流技术， 目前一些全球领先的 CDMA/HRPD运营商决定从 现有的 HRPD网络逐步升级到 LTE的 E-UTRAN。 在网络升级的过程中， 由 于同时存在 HRPD和 E-UTRAN两种网络，其中 E-UTRAN部分覆盖， HRPD 完全覆盖，一些终端用户需要使用 HRPD-LTE双模终端来进行全网络的漫游。 下述本发明实施例以 E-UTRAN和 HRPD网络共存场景为例， 例如： 两 网的覆盖垂直相叠场景和两网的覆盖水平相交场景， 进行空闲态切换和激活 态切换前扫描流程， 其中空闲态切换也称作小区重选。 下述本发明实施例中 均假设终端当前驻留在一个 HRPD网络 (源接入技术 )覆盖的小区内， 该终 端则根据 HRPD网络覆盖的小区的覆盖指示信息来决定是否扫描 E-UTRAN (目标接入技术）覆盖的小区。
图 8为本发明实施例八提供的另一种扫描方法的流程示意图，如图 8所示， 本实施例的扫描方法可以包括以下步骤：
步骤 801、 终端根据接收到的覆盖指示信息确定终端所属的小区部分被
E-UTRAN覆盖；
其中的覆盖指示信息可以在现有技术中的扫描位之外加 1到 N位补充位 来说明该小区交叠覆盖的 E-UTRAN的情况，其中 N为大于或等于 1的整数。 覆盖指示信息可以分别以两种形式指示终端该小区被 E-UTRAN的覆盖情况： a、 形式一
覆盖指示信息包括扫描位和至少一比特的补充位， 上述扫描位和至少一 比特的补充位指示该小区被 E-UTRAN覆盖的覆盖值， 该覆盖值为 0~1之间 的数。
该种形式中， 补充位与原来的扫描位（例如： 一比特的扫描位）合起来 指示该小区被 E-UTRAN覆盖的覆盖值， 这样共有 N+1个比特位来指示覆盖 情况。 如果为全 1 , 则说明该小区全部被 E-UTRAN覆盖； 如果为全 0, 则说 明该小区整个都不被 E-UTRAN覆盖； 如果为全 0与全 1之间的数， 则说明 该小区被 E-UTRAN覆盖的概率。 当然上述取值与其表示的含义反过来定义 也可以。
下面以 N为 1为例， 这时扫描位 +补充位共有 4种指示状态， 分别可以 为 11、 10、 01、 00。 四种指示状态分别表示如下：
11小区全部被 E-UTRAN覆盖；
10小区 2/3部分被 E-UTRAN覆盖；
01小区 1/3部分被 E-UTRAN覆盖； 00小区整个都不被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以指 明该小区被 E-UTRAN覆盖的覆盖值。
b、 形式二
覆盖指示信息包括扫描位，该扫描位指示该小区是否被 E-UTRAN覆盖， 若该扫描位指示该小区被 E-UTRAN覆盖， 那么上述覆盖指示信息还包括至 少一比特的补充位， 上述至少一比特的补充位指示该小区被 E-UTRAN覆盖 的覆盖值， 该覆盖值为 0~1之间的数。
该种形式中， 若扫描位为 1 , 则说明该小区整个都被 E-UTRAN覆盖， 这种情况下无须与补充位合起来指示该小区被 E-UTRAN覆盖的覆盖值； 若 扫描位为 0, 这种情况需要补充位来指示该小区被 E-UTRAN覆盖的覆盖值， 这样共有 N个比特位来指示覆盖情况： 如果补充位为全 0, 则说明该小区整 个都不被 E-UTRAN覆盖； 如果补充位为值域范围内的其它取值 (全 1或全 0与全 1之间的数）， 则说明该小区被 E-UTRAN覆盖的概率。 当然上述取值 与其表示的含义反过来定义也可以。
下面以 N为 2为例， 这时扫描位和补充位所指示的指示状态分别表示如 下：
1小区全部被 E-UTRAN覆盖；
0 11小区 3/4被 E-UTRAN覆盖；
0 10小区 2/4被 E-UTRAN覆盖；
0 01小区 1/4被 E-UTRAN覆盖；
0 00小区整个都不被 E-UTRAN覆盖。
综上所述， 终端所在 HRPD网络覆盖下的小区中的接入网络设备可以在 指明该小区是否被 E-UTRAN覆盖的同时，说明被 E-UTRAN覆盖的覆盖值。
步骤 802、 若终端根据上述覆盖指示信息所指示的扫描信息 (即扫描位 所指示的扫描信息）产生对 E-UTRAN进行扫描的扫描判决信息， 终端则根 据上述覆盖指示信息所指示的该小区被 E-UTRAN 覆盖的覆盖值获取 E-UTRAN的扫描周期，上述扫描周期包括扫描 E-UTRAN的扫描时间与扫描 HRPD网络的扫描时间； 本步骤中的 E-UTRAN 的扫描周期包括掩码之前时长长度 ( PreMaskDu ration ), 掩码时长长度（ MaskDuration )、 掩码之后时长长度 ( PostMaskDuration )三个扫描配置参数， 一个扫描周期就是上述三个参数 的时长之和， 最终只有 MaskDuration用来扫描 HRPD网络以外的其它接入 技术的网络， 而另外两部分的用来在 HRPD网络内工作， 扫描周期的起始时 刻即是 MaskDuration的起始时刻即扫描时刻。本实施例中， 不同的覆盖值可 以分别对应不同的一套预先设置的扫描配置参数， 还可以对应一套预先设置 的用于计算扫描配置参数表达式， 只要能够保证覆盖值低的小区中终端的扫 描周期大即可。 例如： 小区被 E-UTRAN覆盖的覆盖值为 X, 本步骤中的三 个 E-UTRAN的扫描配置参数可以表达如下：
PreMaskDu ration为 1/X * 2ΛΚ, 单位为时隙；
PostMaskDuration的设置与上同 （当然也可不同）；
MaskDuration可设置与覆盖值无关的常数， 例如： 2个时隙。
若 E-UTRAN 存在一个规定的扫描周期 T , 则可以调整 K, 以使得 "PreMaskDuration+PostMaskDuration+MaskDuration" 的取值为扫描周期 T或扫描周期 T的倍数即可； 若 E-UTRAN不存在一个规定的扫描周期 T, 那么可以根据其他约束条件调整 K。
本步骤中的 E-UTRAN的扫描配置参数是与覆盖指示信息所指示的该小 区被 E-UTRAN覆盖的覆盖值相对应的一套数值或表达形式。 当终端接收到 来自当前服务的 HRPD网络中的接入网络设备发送的覆盖指示信息时， 根据 该覆盖指示信息所指示的该小区被 E-UTRAN覆盖的覆盖值获取相应的扫描 配置参数， 以确保高覆盖值时扫描周期短， 低覆盖值时扫描周期长。
步骤 803、 E-UTRAN的扫描时刻到来时， 对 E-UTRAN进行扫描。 与现有技术方案中通过协商确定上述三个扫描配置参数相比， 本实施例 中， 用一个较短的广播值即接入网络设备下发的覆盖指示信息 （约小于 8比 特）代替了三个共 48比特位的协商值， 节省了比特开销； 本实施例中， 可以 同时改变每个扫描周期内扫描其它网络的长度和扫描周期， 从而可以使得覆 盖值越低， 扫描时间越短， 扫描周期越长， 而现有技术方案中的协商值只能 用来决定每个扫描周期内扫描其它网络的长度， 不能用来决定扫描周期， 增 大了灵活性。
图 9为本发明实施例九提供的另一种扫描方法的流程示意图，如图 9所示， 本实施例的扫描方法可以包括以下步骤：
步骤 901、 终端根据接收到的覆盖指示信息确定终端所属的小区部分被 E-UTRAN覆盖；
本步骤的说明可以参见本发明实施例八中步骤 801的相关说明。
步骤 902、 若终端根据上述覆盖指示信息所指示的扫描信息 (即扫描位 所指示的扫描信息）产生对 E-UTRAN进行扫描的扫描判决信息， 终端则根 据上述覆盖指示信息所指示的该小区被 E-UTRAN覆盖的覆盖值和扫描次数 获取 E-UTRAN的扫描周期；
终端在一个初始扫描周期与最大扫描周期之间， 根据覆盖值和已经进行 过的扫描次数可以确定每一次扫描 （扫描可能会因为某些原因失败） 的扫描 周期， 上述每一次扫描的扫描周期即为覆盖值和已经进行过的扫描次数的函 数。 例如： 假设初始扫描周期为 2T, 最大扫描周期为 20T, 在第一个扫描时 刻到来后进行 T时长的第一次扫描，此时扫描周期为 2T;若第一次扫描失败， 则下次于 2T/50%-T = 3T间隔后， 再进行第二次扫描， 扫描时间长度仍为 Τ, 扫描周期则变为 4Τ (扫描时长 Τ+扫描间隔 3T ); 若第二次扫描失败， 则下 次于 4Τ/50%-Τ = 7Τ间隔后， 再进行第三次扫描， 扫描时间长度为 Τ, 扫描 周期则变为 8Τ, 以此类推， 如果一直失败， 则直到扫描周期增大到 20Τ。
步骤 903、 E-UTRAN的扫描时刻到来时， 对 E-UTRAN进行扫描。
本实施例中终端采用了逐步退避的处理方式获取到了 E-UTRAN 的扫描 周期， 该扫描周期的扫描间隔是逐渐增大的， 减少了终端扫描失败的概率， 从而节省了终端的功耗。
需要说明的是： 对于前述的各方法实施例， 为了简单描述， 故将其都表 述为一系列的动作组合， 但是本领域技术人员应该知悉， 本发明并不受所描 述的动作顺序的限制， 因为依据本发明， 某些步骤可以采用其他顺序或者同 时进行。 其次， 本领域技术人员也应该知悉， 说明书中所描述的实施例均属 于优选实施例， 所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中， 对各个实施例的描述都各有侧重， 某个实施例中没有 详述的部分， 可以参见其他实施例的相关描述。
图 10为本发明实施例十提供的另一种终端的结构示意图， 如图 10所示， 本实施例的终端可以包括第二识别模块 1001、 第二获取模块 1002和第二扫 描模块 1003。 其中， 第二识别模块 1001根据接收到的覆盖指示信息， 确定 终端所属的小区部分被目标接入技术的网络覆盖； 第二获取模块 1002 若根 据上述覆盖指示信息所指示的扫描信息产生对上述目标接入技术的网络进行 扫描的扫描判决信息， 根据上述覆盖指示信息所指示的上述小区被上述目标 接入技术的网络覆盖的覆盖值， 获取上述目标接入技术的网络的扫描周期， 上述扫描周期包括扫描上述目标接入技术的网络的扫描时间与扫描源接入技 术的网络的扫描时间； 第二扫描模块 1003 上述目标接入技术的网络的扫描 时刻到来时， 对上述目标接入技术的网络进行扫描。
上述本发明实施例七的方法、 本发明实施例八中终端和本发明实施例九 中终端的功能均可以由本实施例提供的另一种终端实现。
本实施例中第二识别模块所接收到的覆盖指示信息是由当前服务的源接 入技术的网络中的接入网络设备向终端发送的， 该覆盖指示信息能够指示出 终端所属的小区被目标接入技术的网络覆盖的覆盖值。 第二识别模块可以根 据上述覆盖值确定出其所属的小区被目标接入技术的网络覆盖的情况， 若该 小区部分被目标接入技术的网络覆盖， 那么若第二获取模块根据上述覆盖指 示信息所指示的扫描信息产生对上述目标接入技术的网络进行扫描的扫描判 决信息， 则可以根据上述覆盖值获取到目标接入技术的网络的扫描周期， 以 保证覆盖值越低， 扫描时间越短， 扫描周期越长。 第二扫描模块根据第二获 取模块所获取的扫描周期， 在目标接入技术的网络的扫描时刻到来时， 对目 标接入技术的网络进行扫描， 节省了位于两网的交叠覆盖区域边界的小区内 终端的功耗， 避免了位于两网的交叠覆盖区域边界的小区内终端失去切换到 更好的网络的机会， 避免了位于两网的交叠覆盖区域边界的小区内终端移动 到未被当前服务的接入技术的网络覆盖的邻近区域中发生掉网， 避免了由于 位于两网的交叠覆盖区域的小区内的终端同时发起切换请求而引起的网络的 负载突然增加和接入时延的增加， 提高了通信质量。
图 11 为本发明实施例十一提供的另一种扫描系统的结构示意图， 如图 11 所示， 本实施例的扫描系统可以包括第二接入网络设备 1101 和第二终端 1102。 其中：
第二接入网络设备 1101 , 用于发送覆盖指示信息， 上述覆盖指示信息指 示上述小区被上述目标接入技术的网络覆盖的覆盖值；
第二终端 1102, 用于根据接收到的上述第二接入网络设备 1101发送的 覆盖指示信息，确定上述第二终端 1102所属的小区部分被目标接入技术的网 络覆盖， 若根据上述覆盖指示信息所指示的扫描信息产生对上述目标接入技 术的网络进行扫描的扫描判决信息， 根据上述覆盖指示信息所指示的上述小 区被上述目标接入技术的网络覆盖的覆盖值， 获取上述目标接入技术的网络 的扫描周期， 上述扫描周期包括扫描上述目标接入技术的网络的扫描时间与 扫描源接入技术的网络的扫描时间， 上述目标接入技术的网络的扫描时刻到 来时， 对上述目标接入技术的网络进行扫描。
上述本发明实施例七的方法、 本发明实施例八中终端和本发明实施例九 中终端的功能均可以由本实施例提供的另一种扫描系统中的第二终端 1102 实现。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM , 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要求
1、 一种扫描方法， 其特征在于， 包括：
根据接收到的覆盖指示信息， 确定终端所属的小区部分被目标接入技术 的网络覆盖；
根据所述覆盖指示信息所指示的所述小区被所述目标接入技术的网络覆 盖的覆盖值产生扫描判决信息；
所述目标接入技术的网络的扫描时刻到来时， 根据所述扫描判决信息， 对所述目标接入技术的网络进行扫描。
2、 根据权利要求 1所述的方法， 其特征在于， 所述覆盖指示信息包括扫 描位和补充位， 所述扫描位和所述补充位指示所述小区被所述目标接入技术 的网络覆盖的覆盖值。
3、 根据权利要求 1所述的方法， 其特征在于， 所述覆盖指示信息包括扫 描位， 所述扫描位指示所述小区是否被目标接入技术的网络覆盖， 若所述扫 描位指示所述小区被所述目标接入技术的网络覆盖，所述覆盖指示信息还包括 补充位， 所述补充位指示所述小区被所述目标接入技术的网络覆盖的覆盖值。
4、 根据权利要求 1所述的方法， 其特征在于， 所述根据所述覆盖指示信 息所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值产生扫描判决 信息包括：
生成一个 0~1之间均匀分布的随机数；
根据所述随机数与所述覆盖指示信息所指示的所述小区被所述目标接入 技术的网络覆盖的覆盖值之间的关系 , 产生扫描判决信息。
5、 根据权利要求 1、 2、 3或 4所述的方法， 其特征在于， 还包括： 预 先获取所述目标接入技术的网络的扫描周期， 所述扫描周期包括扫描所述目 标接入技术的网络的扫描时间与扫描源接入技术的网络的扫描时间。
6、 根据权利要求 5所述的方法， 其特征在于，
所述扫描周期为一常量； 或者
所述扫描周期为所述覆盖值和 /或上一次扫描周期的函数。
7、 一种终端， 其特征在于， 包括：
第一识别模块， 用于根据接收到的覆盖指示信息， 确定终端所属的小区 部分被目标接入技术的网络覆盖；
随机模块， 用于根据所述覆盖指示信息所指示的所述小区被所述目标接 入技术的网络覆盖的覆盖值产生扫描判决信息；
第一扫描模块， 用于所述目标接入技术的网络的扫描时刻到来时， 根据 所述扫描判决信息， 对所述目标接入技术的网络进行扫描。
8、 根据权利要求 7所述的终端， 其特征在于， 还包括： 第一获取模块， 用于预先获取所述目标接入技术的网络的扫描周期。
9、 一种扫描系统， 其特征在于， 包括：
第一接入网络设备， 用于发送覆盖指示信息， 所述覆盖指示信息指示所 述小区被所述目标接入技术的网络覆盖的覆盖值；
第一终端， 用于根据接收到的所述第一接入网络设备发送的覆盖指示信 息， 确定所述第一终端所属的小区部分被目标接入技术的网络覆盖， 根据所 述覆盖指示信息所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值 产生扫描判决信息， 所述目标接入技术的网络的扫描时刻到来时， 根据所述 扫描判决信息， 对所述目标接入技术的网络进行扫描。
10、 根据权利要求 9所述的系统， 其特征在于， 所述第一终端还用于预 先获取所述目标接入技术的网络的扫描周期。
11、 一种扫描方法， 其特征在于， 包括：
根据接收到的覆盖指示信息， 确定终端所属的小区部分被目标接入技术 的网络覆盖；
若根据所述覆盖指示信息所指示的扫描信息产生对所述目标接入技术的 网络进行扫描的扫描判决信息， 根据所述覆盖指示信息所指示的所述小区被 所述目标接入技术的网络覆盖的覆盖值， 获取所述目标接入技术的网络的扫 描周期；
所述目标接入技术的网络的扫描时刻到来时， 对所述目标接入技术的网 络进行扫描。
12、根据权利要求 11所述的方法， 其特征在于， 所述覆盖指示信息包括 扫描位和补充位， 所述扫描位和所述补充位指示所述小区被所述目标接入技 术的网络覆盖的覆盖值。
13、根据权利要求 11所述的方法， 其特征在于， 所述覆盖指示信息包括 扫描位， 所述扫描位指示所述小区是否被目标接入技术的网络覆盖， 若所述 扫描位指示所述小区被所述目标接入技术的网络覆盖， 所述覆盖指示信息还 包括补充位， 所述补充位指示所述小区被所述目标接入技术的网络覆盖的覆 盖值。
14、 根据权利要求 11、 12或 13所述的方法， 其特征在于， 所述根据所 述覆盖指示信息所指示的所述小区被所述目标接入技术的网络覆盖的覆盖 值， 获取所述目标接入技术的网络的扫描周期包括： 根据所述覆盖指示信息 所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值和扫描次数， 获 取所述目标接入技术的网络的扫描周期。
15、 一种终端， 其特征在于， 包括：
第二识别模块， 用于根据接收到的覆盖指示信息， 确定终端所属的小区 部分被目标接入技术的网络覆盖；
第二获取模块， 用于若根据所述覆盖指示信息所指示的扫描信息产生对 所述目标接入技术的网络进行扫描的扫描判决信息， 根据所述覆盖指示信息 所指示的所述小区被所述目标接入技术的网络覆盖的覆盖值， 获取所述目标 接入技术的网络的扫描周期；
第二扫描模块， 用于所述目标接入技术的网络的扫描时刻到来时， 对所 述目标接入技术的网络进行扫描。
16、 一种扫描系统， 其特征在于， 包括：
第二接入网络设备， 用于发送覆盖指示信息， 所述覆盖指示信息指示所 述小区被所述目标接入技术的网络覆盖的覆盖值；
第二终端， 用于根据接收到的所述第二接入网络设备发送的覆盖指示信 息， 确定所述第二终端所属的小区部分被目标接入技术的网络覆盖， 若根据 所述覆盖指示信息所指示的扫描信息产生对所述目标接入技术的网络进行扫 描的扫描判决信息， 根据所述覆盖指示信息所指示的所述小区被所述目标接 入技术的网络覆盖的覆盖值， 获取所述目标接入技术的网络的扫描周期， 所 述目标接入技术的网络的扫描时刻到来时， 对所述目标接入技术的网络进行 扫描。
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