CN102281603B - Switching control method for Femto base station on basis of distributed strategy - Google Patents
Switching control method for Femto base station on basis of distributed strategy Download PDFInfo
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Abstract
The invention discloses a switching control method for a Femto base station on the base of a distributed strategy, which comprises the following steps of: before HNBs (Home Node B) initiate switching on neighbouring cells, firstly detecting states of cells and interacting state information with the HNBs of the neighbouring cells; and according to the state information of the neighbouring cells, deleting the cells with severe information from a switching target cell list. Therefore, the HNBs are avoided being switched to the cells with the severe information and the aims of reducing the switching time delay, reducing the drop call rate generated in the switching process and improving the switching success rate are fulfilled.
Description
Technical field
The present invention relates to wireless mobile telecommunication technology field, particularly the method for handover control of a kind of Femto base station based on distributed strategy.
Background technology
Current, the communication technology develops rapidly, and 3-G (Generation Three mobile communication system) (3G) is commercial in global scale.In communication network, guaranteeing, under the prerequisite of network capacity and quality, to improve the network coverage, be an important problem, 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, occurred that at present (femtocell, is called again Home eNodeB or Home NodeB in a kind of Femto base station, the follow-up convenience for describing, be referred to as HNB), the feature of this base station is that volume is little, power is little, plug and play.
The dedicated resources that HNB can be used as private user is deployed in the private sites such as family, medium-sized and small enterprises.By HNB, can obtain radio communication service, broadband inserting service, fixed communication and serve, also can utilize HNB to build the system that covers some common chamber inner region.From function, HNB is consistent with ordinary base station (being macro base station), but cost, realizes complexity and many technical indicator parameters etc. because applied environment is simple, and the requirement of HNB is lower than ordinary base station.
Be illustrated in figure 1 typical HNB system architecture schematic diagram, HNB system is comprised of HNB gateway (HNB GW), HNB and user terminal (User equipment, UE).HNB GW can think the agency of radio network controller (Radio Network Controller, RNC), and HNB has generally included the function of Node B and RNC.The switching of HNB based on distributed strategy is based upon on following basis: between adjacent node HNB, can pass through HX2 interface, core net or other mode interactive information, each HNB is safeguarding a neighboring BS information list, by upgrading neighboring BS information list with the information interaction of adjacent HNB timing or not timing.
Use under the scene of HNB and need the unified problem of considering service-conformance, the mobile management of terminal UE is provided, realize between HNB, the two-way switching between macro base station and HNB.Switching between HNB, between macro base station and HNB can be regarded the switching between different RNCs as.Handoff procedure in HNB system can be divided into following three steps: 1) handover measurement; 2) switch decision; 3) switch and carry out.As shown in Figure 2, handover measurement is completed 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 complete.
In the research and practice process to prior art, inventor finds that prior art exists following problem:
When switching initiation, unique index as switch decision is PCCPCH RSCP value (Primary Common Control Physical Channel, basic Common Control Physical Channel, RSCP Received Signal Code Power received signal code power), only consider that UE is apart from distance and the receiving and transmitting signal intensity size of base station, and do not consider the state information of target BS, and Target cell state difference is greatly the major reason that causes switching access failure as disturbed.
Summary of the invention
The present invention proposes the method for handover control of a kind of Femto base station based on distributed strategy, avoid using community in bad condition as switching target small area, improve handover success rate.
The method for handover control of Femto of the present invention base station based on distributed strategy, comprises step:
HNB initialization generates and safeguards a neighboring BS information list after starting;
HNB receives the event mode measurement report that UE reports and triggers after switch decision flow process, the PCCPCH RSCP value structure switching target small area list of each adjacent area reporting according to UE, and switching flow is initiated in described switching target small area list Zhong community,
On the basis of the above,
The described neighboring BS information list that HNB generates comprises state information and PCCPCH transmission power information;
HNB generates and safeguards after described neighboring BS information list, trigger before switch decision flow process, also comprise the mutual PCCPCH transmitting power of step: HNB and adjacent area HNB, and according to the PCCPCH transmission power information of corresponding adjacent area in mutual described PCCPCH transmitting power renewal neighboring BS information list, simultaneously, HNB is detected cells state also, and with adjacent area HNB interaction mode information, according to the state information of corresponding adjacent area in mutual described state information updating neighboring BS information list;
HNB constructs after the list of described switching target small area, according to the PCCPCH transmitting power of the adjacent area HNB recording in described neighboring BS information list and adjacent area PCCPCH RSCP value that UE reports by measurement report, calculate the PCCPCH channel path loss of the relative UE in each adjacent area, according to the PCCPCH channel path loss of described neighboring BS information list and the relative UE in each adjacent area, optimize after the list of described switching target small area, again switching flow is initiated in the list Zhong community, switching target small area after optimizing, the Optimality Criteria of described optimization is: the PCCPCH channel path loss that state is not met to switching requirement and/or the relative UE in each adjacent area is deleted from the list of switching target small area over the community of predetermined path loss threshold value.
Preferably, the mutual PCCPCH transmitting power of described step HNB and adjacent area HNB is carried out when HNB initialization starts, or periodically carry out after HNB initialization starts, the mutual up-to-date PCCPCH transmitting power of HNB and adjacent area HNB, and according to the PCCPCH transmission power information of corresponding adjacent area in mutual up-to-date described PCCPCH transmitting power renewal neighboring BS information list.
Preferably, described step HNB detected cells state is periodically to carry out, and the mutual up-to-date state information of HNB and adjacent area HNB, according to the state information of corresponding adjacent area in neighboring BS information list described in mutual up-to-date state information updating.
Preferably, described state information comprises load condition, and described load condition is specially uplink downlink code resources occupation rate, and described switching requires as uplink downlink code resources occupation rate is lower than predetermined load threshold.
Preferably, described state information comprises uplink interference state, the detection method of described uplink interference state is: HNB measures and calculate the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when ISCP assembly average surpasses predetermined value, judge that uplink interference state is as abnormal, otherwise be normal, described switching require for the disturbance state of community be normal.
Preferably, described state information comprises uplink congestion state, the detection method of described uplink congestion state is: HNB measures and calculate 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, using the maximum state uplink congestion states final as community of shared timeslot number, described switching require for uplink congestion state be normal.
Preferably, described state information comprises downlink congestion state, the detection method of described downlink congestion state is: HNB measures and calculate 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, using the maximum state downlink congestion states final as community of shared timeslot number, described switching require for downlink congestion state be normal.
Preferably, 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 meet 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 code resources occupation rate, and described uplink downlink code resources occupation rate is during lower than predetermined load threshold, and described load condition meets described switching requirement;
The detection method of described uplink interference state is: HNB measures and calculate the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when ISCP assembly average surpasses predetermined value, judgement uplink interference state is abnormal, otherwise be normal, described uplink interference state meets described switching requirement when normal;
The detection method of described uplink congestion state is: HNB measures and calculate 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, using the maximum state uplink congestion states final as community of shared timeslot number, described uplink congestion state meets described switching requirement when normal;
The detection method of described downlink congestion state is: HNB measures and calculate 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, using the maximum state downlink congestion states final as community of shared timeslot number, described downlink congestion state meets described switching requirement when normal.
The method for handover control of Femto of the present invention base station based on distributed strategy, before HNB initiates to switch to adjacent area, first detected cells state and with adjacent area HNB interaction mode information, according to adjacent area state information, the severe community of information is rejected from the list of switching target small area.So just avoid HNB to be switched to the severe community of information, reached and reduce handover delay and reduce the call drop probability producing in handoff procedure, and improved the object of handover success rate.
Accompanying drawing explanation
Fig. 1 is typical family base station system configuration diagram;
Fig. 2 is the handoff relation figure in family base station system;
Fig. 3 is the schematic flow sheet of the method for handover control of Femto of the present invention base station based on distributed strategy.
Embodiment
The present invention is to provide the method for handover control of a kind of Femto base station based on distributed strategy, as shown in Figure 3, specifically comprise step:
After step 101, HNB initialization start, HNB is by network management configuration or mutual with adjacent area HNB, to generate and to safeguard a neighboring BS information list.Described neighboring BS information list is including, but not limited to frequency, scrambler, PCCPCH transmitting power, the state information of adjacent area.
The mutual PCCPCH transmitting power of step 102, HNB and adjacent area HNB, and upgrade the adjacent area PCCPCH transmission power information in neighboring BS information list according to interaction results.This step is carried out when HNB initialization starts, or periodically carry out after HNB initialization starts.Meanwhile, HNB is detected cells state information also, and with the mutual described state information of adjacent area HNB, according to interaction results, periodically update the state information of corresponding adjacent area in neighboring BS information list.This step also can periodically be carried out, cycle length free setting.HNB, when each transmission information, if there is much information to need to send, is encapsulated in this much information in same frame and transmits, if only have a kind of informational needs to send, sends separately this information.
Step 103, when HNB receives the event mode measurement report that UE reports and triggers after switch decision flow process, the PCCPCH RSCP value structure switching target small area list that HNB reports according to UE, according to the PCCPCH transmitting power of the adjacent area HNB recording in neighboring BS information list and adjacent area PCCPCH RSCP value that UE reports by measurement report, calculate the PCCPCH channel path loss of the relative UE in each adjacent area, according to the PCCPCH channel path loss of described neighboring BS information list and the relative UE in adjacent area, optimize after the list of described switching target small area, again switching flow is initiated in the list Zhong community, switching target small area after optimizing.The Optimality Criteria of described optimization is: state is not met and switch required and/or delete from the list of switching target small area community that PCCPCH channel path loss surpasses predetermined path loss threshold value.
In 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 combination in any, and these four kinds of states can be related to whether adjacent cell can become the switching target small area of this HNB.During practical operation, can optionally detect according to demand these four kinds of states.
The detection method of HNB to load condition: the code resources occupation rate of calculating uplink downlink, occupancy is higher shows that load is heavier, be suitable for should not surpassing predetermined load threshold as the load of switching target small area, this predetermined load threshold is predefined threshold value, can arrange as required.When state information is only characterized by load condition, switch and require as uplink downlink code resources occupation rate is lower than predetermined load threshold.
HNB to the detection method of uplink interference state is: HNB measures and calculate each ascending time slot ISCP (Interference Signal Code Power, Interference Signal Code Power) assembly average, and add up ISCP value over the timeslot number count of threshold value (being abnormality), when abnormality timeslot number count surpasses threshold value, judge that ISCP is as abnormal (representing with " 1 "), otherwise be normal condition (representing with " 0 ").When state information is only characterized by uplink interference state, the community that meets switching requirement is that uplink interference state is normal community.
HNB to the detection method of uplink congestion state is: HNB measures and calculate the RTWP(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 (00), overload (01) and underload (11), calculate three kinds of timeslot numbers that state is shared, with total uplink congestion state of corresponding counting thresholding Dui Gai community, adjudicate again, with 00,01,11 identify respectively this community normally, overload, underload three kinds of uplink congestion states.When state information is only characterized by uplink congestion state, the community that meets switching requirement is that uplink congestion state is normal community.
HNB to the detection method of downlink congestion state is: HNB measures and calculate the TCP(Transmitted Carrier Power of each descending time slot, transmitting carrier power) assembly average, 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 total downlink congestion state of corresponding counting thresholding Dui Gai community, adjudicate again, with 00,01,11 identify respectively this community normally, overload, underload three kinds of downlink congestion states.When state information is only characterized by downlink congestion state, the community that meets switching requirement is that downlink congestion state is normal community.
As mentioned above, when state information is a kind of in four kinds of states, switch that to require be that this kind of state meets separately and switch requirement accordingly; State information can be also any both combinations in four kinds of states, any three's combination or whole four combinations, and switching accordingly requirement is that various states meet the correspondence combination of switching requirement separately.
As a preferred embodiment, state information comprises aforementioned whole four kinds of states, therefore, it is that four kinds of states all meet and switch requirements that total switching requires, and is uplink downlink code resources occupation rate specifically lower than predetermined load threshold, uplink interference state for normal, uplink congestion state is for normal and downlink congestion state is for normal.HNB travels through the neighboring BS information list of self real-time servicing, and in the every state information in adjacent area of safeguarding in neighboring BS information list if find, as long as there is one not meet and switch requirement, reject from original UE measuring object list Ze Jianggai community.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (8)
1. the method for handover control of Femto base station based on distributed strategy, comprises step:
The initialization of Femto base station generates and safeguards a neighboring BS information list after starting;
Femto receives base station the event mode measurement report that UE reports and triggers after switch decision flow process, the PCCPCH RSCP value structure switching target small area list of each adjacent area reporting according to UE, and switching flow is initiated in described switching target small area list Zhong community,
It is characterized in that,
The described neighboring BS information list that Femto base station generates comprises state information and PCCPCH transmission power information;
Femto base station generates and safeguards after described neighboring BS information list, trigger before switch decision flow process, also comprise step: the mutual PCCPCH transmitting power in Femto base station and Femto base station, adjacent area, and according to the PCCPCH transmission power information of corresponding adjacent area in mutual described PCCPCH transmitting power renewal neighboring BS information list, simultaneously, Femto base station is detected cells state also, and with Femto base station, adjacent area interaction mode information, according to the state information of corresponding adjacent area in mutual described state information updating neighboring BS information list;
Femto constructs base station after the list of described switching target small area, according to the PCCPCH transmitting power of the Femto base station, adjacent area of recording in described neighboring BS information list and adjacent area PCCPCH RSCP value that UE reports by measurement report, calculate the PCCPCH channel path loss of the relative UE in each adjacent area, according to the PCCPCH channel path loss of described neighboring BS information list and the relative UE in each adjacent area, optimize after the list of described switching target small area, again switching flow is initiated in the list Zhong community, switching target small area after optimizing, the Optimality Criteria of described optimization is: the PCCPCH channel path loss that state is not met to switching requirement and/or the relative UE in each adjacent area is deleted from the list of switching target small area over the community of predetermined path loss threshold value.
2. the method for handover control of Femto according to claim 1 base station based on distributed strategy, it is characterized in that, the mutual PCCPCH transmitting power in described step F emto base station and Femto base station, adjacent area is carried out when the initialization of Femto base station starts, or periodically carry out after the initialization of Femto base station starts, the mutual up-to-date PCCPCH transmitting power in Femto base station and Femto base station, adjacent area, and according to the PCCPCH transmission power information of corresponding adjacent area in mutual up-to-date described PCCPCH transmitting power renewal neighboring BS information list.
3. the method for handover control of Femto according to claim 1 base station based on distributed strategy, it is characterized in that, detected cells, described step F emto base station state is periodically to carry out, the mutual up-to-date state information in Femto base station and Femto base station, adjacent area, according to the state information of corresponding adjacent area in neighboring BS information list described in mutual up-to-date state information updating.
4. the method for handover control based on distributed strategy according to the Femto base station described in claim 1 or 2 or 3, it is characterized in that, described state information comprises load condition, described load condition is specially uplink downlink code resources occupation rate, and described switching requires as uplink downlink code resources occupation rate is lower than predetermined load threshold.
5. the method for handover control based on distributed strategy according to the Femto base station described in claim 1 or 2 or 3, it is characterized in that, described state information comprises uplink interference state, the detection method of described uplink interference state is: Femto base station measurement also calculates the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when ISCP assembly average surpasses predetermined value, judge that uplink interference state is as abnormal, otherwise be normal, described switching require for the disturbance state of community be normal.
6. the method for handover control based on distributed strategy according to the Femto base station described in claim 1 or 2 or 3, it is characterized in that, described state information comprises uplink congestion state, the detection method of described uplink congestion state is: Femto base station measurement also calculates the RTWP assembly average of each ascending time slot, corresponding threshold value is set uplink congestion is divided into three kinds of states: be normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, using the maximum state uplink congestion states final as community of shared timeslot number, described switching require for uplink congestion state be normal.
7. the method for handover control based on distributed strategy according to the Femto base station described in claim 1 or 2 or 3, it is characterized in that, described state information comprises downlink congestion state, the detection method of described downlink congestion state is: Femto base station measurement also calculates the TCP assembly average of each descending time slot, corresponding threshold value is set downlink congestion is divided into three kinds of states: be normal, overload and underload, calculate three kinds of timeslot numbers that state is shared, using the maximum state downlink congestion states final as community of shared timeslot number, described switching require for downlink congestion state be normal.
8. the method for handover control based on distributed strategy according to the Femto base station described in claim 1 or 2 or 3, 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 meet 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 code resources occupation rate, and described uplink downlink code resources occupation rate is during lower than predetermined load threshold, and described load condition meets described switching requirement;
The detection method of described uplink interference state is: Femto base station measurement also calculates the ISCP assembly average of each ascending time slot, when the number that surpasses the time slot of threshold value when ISCP assembly average surpasses predetermined value, judgement uplink interference state is abnormal, otherwise be normal, described uplink interference state meets described switching requirement when normal;
The detection method of described uplink congestion state is: Femto base station measurement also 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, using the maximum state uplink congestion states final as community of shared timeslot number, described uplink congestion state meets described switching requirement when normal;
The detection method of described downlink congestion state is: Femto base station measurement also 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, using the maximum state downlink congestion states final as community of shared timeslot number, described downlink congestion state meets described switching requirement when normal.
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| CN104486781A (en) * | 2014-12-05 | 2015-04-01 | 京信通信系统（中国）有限公司 | Method and device for optimizing centralized switching under LTE (Long Term Evolution) |
| CN106131897B (en) * | 2016-06-20 | 2019-04-30 | 中国科学院信息工程研究所 | A kind of energy-efficient isomery cellular network switching and selecting method of terminaloriented and system |
| CN107809775A (en) * | 2016-09-08 | 2018-03-16 | 中兴通讯股份有限公司 | A kind of blind switching method, device and base station |
| CN109548101A (en) * | 2017-09-22 | 2019-03-29 | 中国移动通信集团浙江有限公司 | A kind of cell switching handling method and system |
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