CN102281569A - Distributed strategy based measurement control method for Femto base station - Google Patents
Distributed strategy based measurement control method for Femto base station Download PDFInfo
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Abstract
The invention discloses a distributed strategy based measurement control method for Femto base station. A Home NodeB (HNB) periodically detects the status of a cell of the HNB, interacts the status information with neighbor cells, and updates the neighbor information list realtimely according to the neighbor status information. In a measurement object list allocated to a UE, only cells with light load, small interference or no congestion in the HNB neighbor information list are configured, and cells with bad or poor information are not used as the measurement objects of the UE. Therefore, cells with insufficient available resource, large interference or congestion status are prevented from being used as the measurement objects, number of cells measured by the UE is decreased, the measurement load of the UE is reduced, the time cost during the measurement process is reduced, and the trying time during the switching process is reduced thereby, thus lowering the switching delay and the drop call probability during the switching process, and improving the switching success rate.
Description
Technical field
The present invention relates to the wireless mobile telecommunication technology field, particularly a kind of Femto base station is based on the measurement control method of distributed strategy.
Background technology
Current, the communication technology develops rapidly, and 3-G (Generation Three mobile communication system) (3G) is in the global scale commercialization.In the communication network, under the prerequisite that guarantees network capacity and quality, improving the network coverage, is an important problem, and therefore various forms base station occurs in succession, as macro base station, microcell base station, distributed base station etc.In order to strengthen the weak link of indoor covering, (femtocell is called Home eNodeB or Home NodeB again to have occurred a kind of Femto base station at present, follow-up convenience for describing, be referred to as HNB), the characteristics of this base station are that volume is little, power is little, plug and play.
The dedicated resources that HNB can be used as private user is deployed in private sites such as family, medium-sized and small enterprises.Can obtain radio communication service, broadband inserting service, fixed communication service by HNB, also can utilize HNB to make up the system that covers some common chamber inner region.On function, HNB is consistent with ordinary base station (being macro base station), but cost, realizes complexity and many technical indicator parameters etc. in response to simple with environment, and the requirement of HNB is lower than ordinary base station.
Be illustrated in figure 1 as typical HNB system architecture schematic diagram, (User equipment UE) forms by HNB gateway (HNB GW), HNB and user terminal in the HNB system.HNB GW can think that (Radio Network Controller, agency RNC), HNB have generally included the function of Node B and RNC to radio network controller.HNB is based upon on the following basis based on the switching of distributed strategy: can pass through HX2 interface, core net or other mode interactive information between the adjacent node HNB, each HNB is safeguarding a neighboring BS information tabulation, by upgrading the neighboring BS information tabulation with the information interaction of adjacent HNB timing or not timing.
HNB can be divided into following three steps based on the handoff procedure of distributed strategy: 1) handover measurement; 2) switch decision; 3) switch execution.As shown in Figure 2, handover measurement is finished by UE and HNB, and switch decision carries out in HNB, switches to carry out under UE, HNB and the common cooperation of HNB GW to finish.The handover measurement procedure of carrying out between UE and the HNB comprises the mutual of " measuring control " and " measurement report " signaling, as shown in Figure 3, " measuring control " is the measurement requirement that HNB is handed down to UE, and " measurement report " is after UE measures according to measurement requirement, reports the measurement result of HNB.Generally, HNB can be when the UE business be set up, or finds in the periodic measurement that reports in the UE communication process report that the received signal intensity decreases of UE in this HNB Serving cell to a certain degree the time, sends event mode to UE and measure control messages.
Event mode " measurement control " message that HNB is handed down to UE comprises a measuring object tabulation, has listed the sub-district that HNB requires UE to measure, and UE is measured by all sub-districts in tabulating and the reporting measurement result gives HNB.In fact, the possibility that the abominable sub-district (as the sub-district of link-quality difference) of partial information becomes switching target small area is very little, even if become switching target small area, call drop takes place easily also in the handoff procedure.Therefore, UE is nonsensical and loses time the measurement of this part sub-district.
Summary of the invention
The present invention proposes the method for a kind of Femto base station,, shorten Measuring Time, reduce and measure expense, increase handover success rate to reduce the measurement number of times of UE based on the measurement control of distributed strategy.
Femto of the present invention base station comprises step based on the measurement control method of distributed strategy:
After the HNB initialization starts, generate and safeguard a neighboring BS information tabulation;
After HNB trigger event type is measured control procedure, will make up the tabulation of UE measuring object, and this UE measuring object tabulation will be handed down to UE as the measuring object of measuring in the control messages according to neighboring BS relationship,
On above step basis,
The described neighboring BS information tabulation that HNB generates comprises state information;
After HNB generates and safeguards described neighboring BS information tabulation, before the HNB trigger event type measuring process, also comprise step: HNB detected cells state, and with adjacent area HNB interaction mode information, according to the state information of corresponding adjacent area in the tabulation of the described neighboring BS information of mutual described state information updating;
After HNB makes up described UE measuring object tabulation according to neighboring BS relationship, according to the state information in the described neighboring BS information tabulation described UE measuring object tabulation is optimized earlier, UE measuring object tabulation after will optimizing again is handed down to UE as the measuring object of measuring in the control messages, and the optimization criterion of described optimization is: state is not met switch the sub-district deletion from the tabulation of UE measuring object that requires.
Preferably, the detection in the described step HNB detected cells state is periodically to detect, and the mutual up-to-date state information of HNB and adjacent area HNB is according to the state information of corresponding adjacent area in the described neighboring BS information tabulation of mutual up-to-date state information updating.
Preferably, described state information comprises load condition, and described load condition is specially uplink downlink sign indicating number resources occupation rate, and described switching requires to be lower than predetermined load threshold for uplink downlink sign indicating number resources occupation rate.
Preferably, described state information comprises the uplink interference state, described uplink interference status detection method is: HNB measures and calculates ISCP (the Interference Signal Code Power of each ascending time slot, Interference Signal Code Power) assembly average, when the number that surpasses the time slot of threshold value when the ISCP assembly average surpasses predetermined value, judge that the uplink interference state is unusual, otherwise be normal that described switching requirement is normal for the uplink interference state of sub-district.
Preferably, described state information comprises the uplink congestion state, described uplink congestion status detection method is: HNB measures and calculates RTWP (the Received Total Wideband Power of each ascending time slot, received bandwidth total power) assembly average, corresponding threshold value is set uplink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final uplink congestion state in sub-district, and described switching requirement is normal for the uplink congestion state.
Preferably, described state information comprises the downlink congestion state, described downlink congestion status detection method is: HNB measures and calculates TCP (the Transmitted Carrier Power of each descending time slot, the emission carrier power) assembly average, corresponding threshold value is set downlink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final downlink congestion state in sub-district, and described switching requirement is normal for the downlink congestion state.
Preferably, described state information comprises the combination in any of load condition, uplink interference state, uplink congestion state and downlink congestion state, total described switching requires to satisfy the correspondence combination that corresponding switching requires separately for described load condition, uplink interference state, uplink congestion state and downlink congestion state
Described load condition is specially uplink downlink sign indicating number resources occupation rate, and when described uplink downlink sign indicating number resources occupation rate was lower than predetermined load threshold, described load condition satisfied described switching requirement;
Described uplink interference status detection method is: HNB measures and calculates the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when the ISCP assembly average surpasses predetermined value, judge that the uplink interference state is unusual, otherwise be normal, described uplink interference state just often satisfies described switching requirement;
Described uplink congestion status detection method is: HNB measures and calculates the RTWP assembly average of each ascending time slot, corresponding threshold value is set uplink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final uplink congestion state in sub-district, and described uplink congestion state just often satisfies described switching requirement;
Described downlink congestion status detection method is: HNB measures and calculates the TCP assembly average of each descending time slot, corresponding threshold value is set downlink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final downlink congestion state in sub-district, and described downlink congestion state just often satisfies described switching requirement.
Femto of the present invention base station is based on the measurement control method of distributed strategy, before UE measures the sub-district in the measuring object tabulation, HNB elder generation and adjacent area HNB interaction mode information, according to the state of adjacent sub-district to UE measuring object tabulation carrying out priori optimization, state is not met adjacent sub-district deletion from the tabulation of UE measuring object of switching requirement, thereby alleviated the surveying work amount of UE, shortened Measuring Time, reduced the measurement expense, reduced the number of attempt in the handoff procedure, and then reduced the call drop probability that produces in handover delay and the handoff procedure, improved handover success rate.
Description of drawings
Fig. 1 is typical HNB system architecture schematic diagram;
Fig. 2 is the handoff relation figure of HNB based on distributed strategy;
Fig. 3 is the schematic flow sheet of Femto base station based on handover measurement in the handoff procedure of distributed strategy;
Fig. 4 is the schematic flow sheet of Femto of the present invention base station based on the measurement control method of distributed strategy.
Embodiment
In traditional handover measurement procedure, UE does not delete choosing to the sub-district in the measuring object tabulation, directly all sub-districts in the measuring object tabulation is measured.Thereby, the abominable sub-district of information (as loading heavily, disturb big or being in the sub-district of congestion state), UE also will measure it.So be necessary HNB is handed down to measuring object tabulation the carrying out priori optimization of UE, reduce the number of attempt in the handoff procedure, and then reduce handover delay and reduce the call drop probability that produces in the handoff procedure, improve handover success rate.Explain the present invention in detail below in conjunction with accompanying drawing.
The present invention is to provide a kind of Femto base station based on improving one's methods that the measurement of distributed strategy is controlled, as shown in Figure 4, specifically comprise step:
After step 101, HNB initialization start, generate and safeguard a neighboring BS information tabulation, described neighboring BS information tabulation is including, but not limited to frequency, the scrambler of adjacent area.For following UE measuring object tabulation is optimized, described neighboring BS information tabulation has increased the adjacent area state information.Adjacent area state information in the initial neighboring BS information tabulation that generates can zero setting also can be made as default value, upgrades after following step 102 detects again.
After step 103, HNB trigger event type are measured control procedure, to make up original UE measuring object tabulation according to neighboring BS relationship, after according to the tabulation of up-to-date neighboring BS information described original UE measuring object tabulation being optimized, the UE measuring object tabulation after will optimizing again is handed down to UE as the measuring object in the measurement control messages.The optimization criterion of described optimization is: state is not met switch the sub-district deletion from the tabulation of UE measuring object that requires, generate new UE measuring object tabulation.What above-mentioned neighboring BS relationship characterized is all adjacent sub-districts adjacent with the HNB affiliated subdistrict.
In the step 102, HNB detects the state information of this Serving cell, state information herein can be load condition, uplink interference state, uplink congestion state, downlink congestion state or four a combination in any, and these four kinds of states can both concern whether adjacent sub-district can become the switching target small area of this HNB.During practical operation, can optionally detect these four kinds of states according to demand.
HNB is to the detection method of load condition: the sign indicating number resources occupation rate of calculating uplink downlink, the high more load that shows of occupancy is heavy more, be suitable for should not surpassing predetermined load threshold as the load of switching target small area, this predetermined load threshold is a pre-set threshold, can be provided with as required.When state information is only characterized by load condition, switch requirement and be lower than predetermined load threshold for uplink downlink sign indicating number resources occupation rate.
HNB to uplink interference status detection method is: HNB measures and calculates each ascending time slot ISCP assembly average, and statistics ISCP value surpasses the timeslot number count of threshold value (being abnormality), when abnormality timeslot number count surpasses threshold value, judge that then ISCP is unusual (with " 1 " expression), otherwise be normal condition (with " 0 " expression).When state information was only characterized by the uplink interference state, satisfying the sub-district of switching requirement was normal sub-district for the uplink interference state.
HNB to uplink congestion status detection method is: HNB measures and calculates the RTWP assembly average of each ascending time slot, corresponding threshold value is set uplink congestion is divided into three kinds of states: normal (00), overload (01) and underload (11), calculate three kinds of timeslot numbers that state is shared, with corresponding counting thresholding total uplink congestion state of this sub-district is adjudicated again, with 00,01,11 identify respectively this sub-district normally, overload, underload three kinds of uplink congestion states.When state information was only characterized by the uplink congestion state, satisfying the sub-district of switching requirement was normal sub-district for the uplink congestion state.
HNB to downlink congestion status detection method is: HNB measures and calculates the TCP assembly average of each descending time slot, corresponding threshold value is set downlink congestion is divided into three kinds of states: normal (00), overload (01) and underload (11), calculate three kinds of timeslot numbers that state is shared, with corresponding counting thresholding total downlink congestion state of this sub-district is adjudicated again, with 00,01,11 identify respectively this sub-district normally, overload, underload three kinds of downlink congestion states.When state information was only characterized by the downlink congestion state, satisfying the sub-district of switching requirement was normal sub-district for the downlink congestion state.
As mentioned above, when state information is a kind of in four kinds of states, switch that to require be that this kind state satisfies separately and switches requirement accordingly; State information also can be that both make up arbitrarily in four kinds of states, the three makes up or whole four combinations arbitrarily, and it is that the satisfied separately correspondence that requires of switching of various states makes up that then corresponding switching requires.
As a preferred embodiment, state information comprises aforementioned whole four kinds of states, therefore, it is that four kinds of states all satisfy the switching requirement that total switching requires, and promptly is that uplink downlink sign indicating number resources occupation rate is lower than predetermined load threshold, the uplink interference state is normal for normal, uplink congestion state for normal and downlink congestion state specifically.HNB travels through the neighboring BS information tabulation of self real-time servicing, as if finding in the every state information in adjacent area that the neighboring BS information tabulation is safeguarded, as long as there is one not satisfy the switching requirement, then this sub-district is rejected from original UE measuring object tabulation.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (7)
1. a Femto base station comprises step based on the measurement control method of distributed strategy:
After the HNB initialization starts, generate and safeguard a neighboring BS information tabulation;
After HNB trigger event type is measured control procedure, will make up the tabulation of UE measuring object, and this UE measuring object tabulation will be handed down to UE as the measuring object of measuring in the control messages according to neighboring BS relationship,
It is characterized in that,
The described neighboring BS information tabulation that HNB generates comprises state information;
After HNB generates and safeguards described neighboring BS information tabulation, before the HNB trigger event type measuring process, also comprise step: HNB detected cells state, and with adjacent area HNB interaction mode information, according to the state information of corresponding adjacent area in the tabulation of the described neighboring BS information of mutual described state information updating;
After HNB makes up described UE measuring object tabulation according to neighboring BS relationship, according to the state information in the described neighboring BS information tabulation UE measuring object tabulation that described UE measuring object tabulation will be optimized after will optimizing again is handed down to UE as the measuring object of measuring in the control messages earlier, the optimization criterion of described optimization is: state is not met switch the sub-district deletion from the tabulation of UE measuring object that requires.
2. Femto according to claim 1 base station is based on the measurement control method of distributed strategy, it is characterized in that, detection in the described step HNB detected cells state is periodically to detect, the mutual up-to-date state information of HNB and adjacent area HNB is according to the state information of corresponding adjacent area in the described neighboring BS information tabulation of mutual up-to-date state information updating.
3. Femto according to claim 1 and 2 base station is based on the measurement control method of distributed strategy, it is characterized in that, described state information comprises load condition, described load condition is specially uplink downlink sign indicating number resources occupation rate, and described switching requires to be lower than predetermined load threshold for uplink downlink sign indicating number resources occupation rate.
4. Femto according to claim 1 and 2 base station is based on the measurement control method of distributed strategy, it is characterized in that, described state information comprises the uplink interference state, described uplink interference status detection method is: HNB measures and calculates the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when the ISCP assembly average surpasses predetermined value, judge that the uplink interference state is unusual, otherwise be normal that described switching requirement is normal for the uplink interference state of sub-district.
5. Femto according to claim 1 and 2 base station is based on the measurement control method of distributed strategy, it is characterized in that, described state information comprises the uplink congestion state, described uplink congestion status detection method is: HNB measures and calculates the RTWP assembly average of each ascending time slot, corresponding threshold value is set uplink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final uplink congestion state in sub-district, and described switching requirement is normal for the uplink congestion state.
6. Femto according to claim 1 and 2 base station is based on the method for handover control of distributed strategy, it is characterized in that, described state information comprises the downlink congestion state, described downlink congestion status detection method is: HNB measures and calculates the TCP assembly average of each descending time slot, corresponding threshold value is set downlink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final downlink congestion state in sub-district, and described switching requirement is normal for the downlink congestion state.
7. Femto according to claim 1 and 2 base station is based on the method for handover control of distributed strategy, it is characterized in that, described state information comprises the combination in any of load condition, uplink interference state, uplink congestion state and downlink congestion state, described switching requires to satisfy separately for described load condition, uplink interference state, uplink congestion state and downlink congestion state the correspondence combination of corresponding switching requirement
Described load condition is specially uplink downlink sign indicating number resources occupation rate, and when described uplink downlink sign indicating number resources occupation rate was lower than predetermined load threshold, described load condition satisfied described switching requirement;
Described uplink interference status detection method is: HNB measures and calculates the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when the ISCP assembly average surpasses predetermined value, judge that the uplink interference state is unusual, otherwise be normal, described uplink interference state just often satisfies described switching requirement;
Described uplink congestion status detection method is: HNB measures and calculates the RTWP assembly average of each ascending time slot, corresponding threshold value is set uplink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final uplink congestion state in sub-district, and described uplink congestion state just often satisfies described switching requirement;
Described downlink congestion status detection method is: HNB measures and calculates the TCP assembly average of each descending time slot, corresponding threshold value is set downlink congestion is divided into three kinds of states: normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, the state that shared timeslot number is maximum is as the final downlink congestion state in sub-district, and described downlink congestion state just often satisfies described switching requirement.
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| CN104053195A (en) * | 2014-06-30 | 2014-09-17 | 京信通信***（中国）有限公司 | Method and device for determining members of blacklist |
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Address after: 510663 Shenzhou Road 10, Science City, Guangdong, Guangzhou Patentee after: Jingxin Network System Co.,Ltd. Patentee after: SOUTH CHINA University OF TECHNOLOGY Address before: 510663 Shenzhou Road 10, Science City, Guangdong, Guangzhou Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. Patentee before: SOUTH CHINA University OF TECHNOLOGY |