CN102307370B - Handover measurement control method for mobile communication system - Google Patents
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Abstract
The invention discloses a handover measurement control method for a mobile communication system. In the method, by virtue of architectural characteristic of a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, RNCs (Radio Network Controllers) can carry out information interaction via an Iur interface or a core network (CN) and maintain a neighboring cell information list in real time; and according to the maintained neighboring cell information list, the RNCs only configure the cells with light load, small interference and good link quality in the neighboring cell information list in a measurement control message issued to UE (User Equipment), while the cells with severe or worse information are not used as measuring objects of the UE so as to prevent the cells with insufficient available resource, too big interference or poor communication link quality from being used as the measuring objects, which decreases number of the cells measured by the UE, reduces measuring burden of the UE, lowers time cost during the measuring process, realizes prior optimization for a measuring object list of the UE to a certain degree and reduces trial times during the handover process so as to reduce handover delay and drop call rate during the handover process and improve handover success rate.
Description
Technical field
The present invention relates to third generation UMTS(universal mobile telecommunications system) and evolution system in measure to control and the method, particularly handover measurement control method for mobile communication system of Uu mouth (air interface) message constructing.
Background technology
Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) is Chinese the 3rd Generation Mobile Communication System 3G wireless transmission scheme of submitting to International Telecommunication Association (ITU) in 1998, it is a kind of brand-new mobile communication system, adopt tdd mode, and adopted a series of new and high technologies such as synchronization CDMA, smart antenna, software radio, baton handover and dynamic channel allocation simultaneously.With respect to WCDMA and CDMA2000, the obvious advantage such as TD-SCDMA has does not need paired frequency band, the availability of frequency spectrum is high, flexibility is strong, be applicable to symmetrical and asymmetric data business, the system equipment cost is low.
As shown in Figure 1, be the structural representation of the wireless access network of TD-SCDMA system.Wireless access network (UTRAN) is comprised of Radio Network System (RNS).A RNS comprises a radio network controller (RNC) and one or more NodeB.NodeB is connected with RNC by Iub interface.RNC is responsible for the switching controls of UE, the combination of grand diversity information flow/functions such as division between the different N that provides support odeB.RNC between RNS is connected by the Iur interface.The Iur interface can directly be connected by the physical connection between RNC, also can be connected by any suitable transmission network.
Hard-switching technology be at present the most substantially, the simplest handoff technique.In the TD-SCDMA system, its direct-cut operation mechanism is with reference to the handover mechanism of existing gsm system, i.e. Mobile Assisted Handover mode.The functions such as the measurement that main guiding theory is switching and processing are distributed in each mobile device, by travelling carriage, are measured the signal strength signal intensity of this base station and peripheral base station, measurement report are analyzed and are processed to RNC, thereby make relevant decision-making of switching.Handoff procedure can be divided into following three steps: 1) handover measurement; 2) switch decision; 3) switching is carried out.Handover measurement is completed by UE, RNC and Node B, and switch decision carries out in RNC, and switching is carried out under UE, RNC and the common cooperation of Node B and completed.
In wireless communication system, due to the UE(user terminal) in mobile status, for grasping state and the channel circumstance thereof of UE, and carry out corresponding decision, such as switching, replacing Radio Resource etc., network need to be controlled UE one tittle is measured, and requires UE to report by specific mode.Measuring and control, is the important means that maintains the wireless link reliability.
Measurement Control (measure and control) message, controlled by the RRC(Radio Resource) the agreement structure, and at the Uu port transmission.Article one, the Uu mouth message of constructing by agreement, get involved to control via the MAC(media) layer and RLC(wireless link control) after the layer protocol processing, be converted into binary bit stream, deliver to the physical layer of transmitting terminal.In physical layer, this bit stream is through a series of processing, comprise add CRC, piecemeal or cascade, chnnel coding, interweave, the segmentation of multiplexing, the physical channel of rate-matched, transmission channel, subframe segmentation etc.; Finally be mapped to physical channel, then via air-launched.
In cellular system, the NodeB of UE Yao Duizhe community and adjacent cell is measured.As shown in Figure 2, be a typical example of measuring control flow.UTRAN constructs message, and send to measure control message to UE, i.e. Measurement control message comprises the information such as the measurement target list that is used to indicate UE and measured, measuring amount, measurement report rule in this Measurement control message; UE stores the content of this message, or according to this message content, local canned data is modified; And specified measuring amount is measured to message, by the report rule of message appointment, to UTRAN, send measurement report message, i.e. Measurement Report message.
In to existing mobile communication system, in the research and practice process of handover measurement control message, the inventor finds that there is following problem in prior art:
In traditional handover measurement control message, specify the measuring object of UE to be generally all communities or the part community in the adjacent cell list of base station, the community of these designated measurements, through deleting choosing (comprising the severe community of state information), does not specify the measuring object of UE to have blindness.Therefore, the community of state information severe (load is heavy, disturbs greatly, and link-quality is poor), the possibility as the UE switching target small area is very little, and UE also will be measured it.So be necessary RNC is passed through to base station, priori optimization is carried out in the measuring object list that is handed down to UE, reduces the number of attempt in handoff procedure, and then reduces the call drop probability produced in handover delay and handoff procedure, improve handover success rate.
Summary of the invention
Technical problem to be solved by this invention is: a kind of handover measurement control method for mobile communication system is provided, avoid that load is overweight, disturb the excessive or link-quality Cha community measuring object as UE, the optimization UE measuring object list of priori to a certain extent, improve handover success rate.Concrete technical scheme is as follows:
A kind of handover measurement control method for mobile communication system comprises step:
A: during the macrocellular network initialization, at each RNC(Radio Network Controller, radio network controller) in, a neighboring BS information list is safeguarded on generation periodicity or aperiodicity ground.Described neighboring BS information list comprises frequency, scrambler and the cell status information of adjacent area; Each RNC periodically or aperiodicity ground detect the Node B(Base Station administered, base station) each logic district state information, and to carry out state information mutual with adjacent area RNC, then according to the corresponding neighboring BS information list content of state information updating;
B: when RNC trigger event type is measured control procedure, will build UE(User Equipment, subscriber equipment according to neighboring BS relationship) measuring object list;
C: the RNC that the trigger event type is measured control procedure optimizes the list of UE measuring object according to the neighboring BS information list after upgrading, and the measuring object of UE measuring object list in measuring control message after this is optimized, and by base station, is handed down to UE.
Above-mentioned a kind of handover measurement control method for mobile communication system, the adjacent area in described step a in the neighboring BS information list comprises: all logic district of the Node B that this RNC administers, and adjacent R NC all logic district of administering.
Above-mentioned a kind of handover measurement control method for mobile communication system, in step a, RNC under each logic district state information of Node B is uploaded to by Iub interface, directly undertaken by Iur interface or CN (Core Network, core net) between adjacent R NC alternately.
Above-mentioned a kind of handover measurement control method for mobile communication system, the cell status information classification of neighboring BS information list in described step a comprises: adjacent area resource state information, adjacent area disturbance state information and adjacent area link-quality state information.
In above-mentioned a kind of handover measurement control method for mobile communication system, described adjacent area resource state information comprises: characterize other information of cell load level, characterize the information of up code resource utilization and characterize the information of descending code resource utilization.
In above-mentioned a kind of handover measurement control method for mobile communication system, whether extremely described adjacent area disturbance state information comprises: characterize the information of uplink interference signal code power, the information that characterizes basic Common Control Physical Channel carrier/interface ratio (PCCPCH C/I), the information that characterizes DPCH received signal code power (DPCH RSCP) and sign received total wideband power (RTWP, the Received Total Wideband Power) information of lifting.
In above-mentioned a kind of handover measurement control method for mobile communication system, described adjacent area link-quality state information comprises: characterize the PCCPCH(Primary Common Control Physical Channel of each adjacent area with respect to UE, Primary Common Control Physical Channel) information of channel path loss, characterize the information of cell downlink power termination (TxCP) and characterize the information of the quality index Block Error Rate (BLER) of service transmission channel.
Above-mentioned a kind of handover measurement control method for mobile communication system, in described step c, RNC is according to safeguarded neighboring BS information list, and by one of following two kinds of optimal way, to the UE measuring object, list is optimized:
F1: when base station initialization or self-configuring, the factor of optimizing one or several state information as the list of UE measuring object regularly, according to the criterion of setting, to the UE measuring object, list is optimized; Described state information is adjacent area resource state information, adjacent area disturbance state information or adjacent area link-quality state information
F2: detected by the real-time state to system, the state information for optimizing the list of UE measuring object is dynamically adjusted, according to the criterion of setting, to the UE measuring object, list is optimized; Described state information is adjacent area resource state information, adjacent area disturbance state information or adjacent area link-quality state information.
Above-mentioned a kind of handover measurement control method for mobile communication system, the criterion of setting described in mode f1 is: fixing one or several the selected state information of mobile communication system is weighted to combined calculation, according to the result of calculating, the UE measuring object is sorted, generated new UE measuring object list.
Above-mentioned a kind of handover measurement control method for mobile communication system, the criterion of setting described in mode f2 is: according to the real-time selected state information of mobile communication system, be weighted combined calculation, according to the result of calculating, the UE measuring object is sorted, generated new UE measuring object list.
Compared with prior art, the present invention has following advantage and technique effect:
The construction characteristic of this method application TD-SCDMA system, can pass through lur interface or core net interactive information between RNC, as the state information of resource, load information, interfere information etc., makes each RNC safeguard in real time a neighboring BS information list.RNC is according to the neighboring BS information list of safeguarding, in being handed down to the measurement control message of UE, in configuring adjacent cell information list, load is light, disturb little, link-quality Hao community, severe or the poor community of information is not as the measuring object of UE, so just avoid available resources are inadequate, disturb excessive or communication link quality Cha community also as measuring object, reach and reduce the community number that UE measures, reduce the measurement burden of UE, reduce the time overhead of measuring process, the optimization of priori switching UE measuring object list to a certain extent, reduce the number of attempt in handoff procedure, and then the call drop probability produced in minimizing handover delay and handoff procedure, improve handover success rate.
The accompanying drawing explanation
Fig. 1: the structural representation that means the wireless access network of TD-SCDMA system;
Fig. 2: mean mobile communication system handover measurement control procedure schematic diagram;
Fig. 3: the schematic flow sheet of handover measurement control method for mobile communication system of the present invention;
Fig. 4: pass through Iur interactive interfacing information schematic diagram between embodiment of the present invention RNC;
Fig. 5: pass through core net interactive information schematic diagram between embodiment of the present invention RNC.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only an explanation of the present invention.
The embodiment of the present invention provides a kind of handover measurement control method for mobile communication system, can avoid that load is overweight, disturb the excessive or communication link quality Cha community measuring object as UE, improves handover success rate.
Fig. 3 is the schematic flow sheet of embodiment of the present invention handover measurement control method, specifically comprises step:
When step 1, macrocellular network initialization, generate and periodically safeguard a neighboring BS information list in each RNC.Described neighboring BS information list is including, but not limited to frequency, scrambler, the cell status information of adjacent area; Each RNC is detected cells state information periodically, and with adjacent area RNC interaction mode information, local RNC is according to the corresponding neighboring BS information list content of state information updating;
This step is specially:
Adjacent area in the neighboring BS information list of RNC real-time servicing comprises: all logic district of the Node B that this RNC administers, and adjacent R NC each logic district of administering.Arbitrary Node B in macrocell system need give affiliated RNC by the information reporting of its all logic district, Node B needs regularly or not timing ground carries out information reporting, Node B, when each transmission information, can transmit Information encapsulation in a frame, also can be encapsulated in multiframe and transmit.The information that needs the interactive maintenance Neighboring Cell List between adjacent R NC, between adjacent R NC, the information of maintenance neighborlist can directly be undertaken alternately by Iur interface or core net, Fig. 4 is directly by the schematic diagram of Iur interactive interfacing state information between RNC, source RNC sends the state information request message by the Iur interface to adjacent RNC, after adjacent RNC receives this request message, the structural regime information reporting, and sending this status information reporting by the Iur interface to source RNC, source RNC upgrades the state information of corresponding adjacent area in the neighboring BS information list according to status information reporting.Fig. 5 is by the schematic diagram of core net interaction mode information between RNC.Information interaction between source RNC and adjacent RNC is forwarded by core net, source RNC sends the state information request message to core net, core net forwards this message to adjacent RNC, after adjacent RNC receives this request message, the structural regime information reporting, send this status information reporting by core net to source RNC, source RNC upgrades the state information of corresponding adjacent area in the neighboring BS information list according to status information reporting.
The neighboring BS information list that each RNC safeguards, comprise the following information category in adjacent area: the disturbance state information of the resource state information of adjacent area, adjacent area and the link-quality state information of adjacent area.
The adjacent area resource state information can comprise: characterize other information of cell load level, characterize up code resource utilization information, characterize the information of descending code resource utilization.
Adjacent area disturbance state information can comprise: characterize uplink interference signal code power average value information, characterize basic Common Control Physical Channel carrier/interface ratio (PCCPCH C/I) information, characterize the information of DPCH received signal code power (DPCH RSCP).Characterize the whether extremely information of lifting of received total wideband power (RTWP, Received Total Wideband Power).
Adjacent area link-quality state information can comprise: whether the loss of sign up path surpasses the information of the quality index Block Error Rate (BLER) of the information of threshold values, the information that characterizes cell downlink power termination (TxCP), sign service transmission channel.
The state information of step 1 small area can be the combination in any of above-mentioned cell status information, and these state informations can concern whether community can become the measuring object of UE, during practical operation, can optionally detect according to demand these state informations.
The present embodiment be take load condition, disturbance state, RTWP or three's that the state information of community is community combination in any and is described, and during practical operation, can optionally detect according to demand these three kinds of states.
With the descending code of Shang Hang resource utilization, uplink interference signal code power, the detection method that RTWP is example description status information:
RNC calculate respectively uplink downlink the code resources occupation rate, and judge by setting threshold values and the state of this community mean congestion state with " 1 ", " 0 " means normal condition; The Interference Signal Code Power mean value of all subframes of each ascending time slot of each logic district under RNC calculates
, and corresponding threshold value is set uplink interference is divided into to three kinds of states: normal (00), congested (01), overload (11).Judge the residing disturbance state of each time slot by decision threshold, and add up (calculating three kinds of timeslot numbers that state is shared) by counter respectively, then adjudicated by the disturbance state of corresponding counting thresholding Dui Gai community.Disturbance state with 00,01,11 these communities of sign; Between RNC, mutual RTWP information can adopt the mode that the cycle is mutual and Event triggered combines alternately: RNC to measure the RTWP value of ascending time slot, and statistics RTWP value surpasses the timeslot number of thresholding (being abnormality), when the abnormality timeslot number surpasses threshold value, judge that RTWP is abnormal, with " 1 ", mean, otherwise be normal condition, mean with " 0 ".
Step 2, from the information after counting statistics step 1, this RNC is to mutual these information of adjacent R NC node.RNC, 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, send separately this information.
Step 3, obtain adjacent R NC node status information from step 2, each RNC upgrades corresponding neighboring BS information list content;
Step 4: when handover measurement procedure triggers, the measuring object list that Serving RNC is measured UE in control message according to the neighboring BS relationship structure;
Step 5, in Serving RNC, neighboring BS information list according to self maintained, measuring object list to UE in step 4 is optimized, upper/row code resource utilization adjacent area too high, that uplink interference signal code power is excessive, RTWP is abnormal is rejected to (concrete rejecting rule can be set as requested), generated new measuring object list from the measuring object list.
This step is specially:
RNC is to each community in the measuring object list, in the neighboring BS information list of self periodicmaintenance, traveled through, in the every state information in adjacent area of safeguarding in the neighboring BS information list if find, as long as there is a state information severe, reject from the measuring object list Ze Jianggai community, as up code resource utilization surpasses thresholding, is congestion state, in information list, information bit is " 1 ", from the measuring object list, rejects this community.The rest may be inferred for other.
Step 6, the UE measuring object list after optimizing in step 5, as a part of measuring control message, by base station, are handed down to UE.
Claims (3)
1. a handover measurement control method for mobile communication system comprises step:
A: during the macrocellular network initialization, generate a neighboring BS information list in each RNC; Described neighboring BS information list comprises frequency, scrambler and the cell status information of adjacent area; Each RNC periodically or aperiodicity ground detect each logic district state information of the Node B administered, and to carry out state information mutual with adjacent area RNC, then according to the corresponding neighboring BS information list content of state information updating; The cell status information classification of described neighboring BS information list comprises: adjacent area resource state information, adjacent area disturbance state information and adjacent area link-quality state information; Described adjacent area resource state information comprises: characterize other information of cell load level, characterize the information of up code resource utilization and characterize the information of descending code resource utilization; Whether extremely described adjacent area disturbance state information comprises: characterize the information of uplink interference signal code power, the information that characterizes basic Common Control Physical Channel carrier/interface ratio, the information that characterizes the DPCH received signal code power and the sign received total wideband power information of lifting; Described adjacent area link-quality state information comprises: characterize the information of each adjacent area with respect to the quality index Block Error Rate of the information of the PCCPCH channel path loss of UE, the information that characterizes the cell downlink power termination and sign service transmission channel;
B: when RNC trigger event type is measured control procedure, will build the list of UE measuring object according to neighboring BS relationship;
C: the RNC that the trigger event type is measured control procedure optimizes the list of UE measuring object according to the neighboring BS information list after upgrading, and the measuring object of UE measuring object list in measuring control message after this is optimized, and by base station, is handed down to UE; Described RNC is according to safeguarded neighboring BS information list, and by one of following two kinds of optimal way, to the UE measuring object, list is optimized:
F1: when base station initialization or self-configuring, the factor of optimizing one or several state information as the list of UE measuring object regularly, according to the criterion of setting, to the UE measuring object, list is optimized; Described state information is adjacent area resource state information, adjacent area disturbance state information or adjacent area link-quality state information;
F2: detected by the real-time state to system, the state information for optimizing the list of UE measuring object is dynamically adjusted, according to the criterion of setting, to the UE measuring object, list is optimized; Described state information is adjacent area resource state information, adjacent area disturbance state information or adjacent area link-quality state information.
2. a kind of handover measurement control method for mobile communication system according to claim 1, it is characterized in that in described step a, the adjacent area in the neighboring BS information list comprises: all logic district of the Node B that this RNC administers, and adjacent R NC all logic district of administering.
3. a kind of handover measurement control method for mobile communication system according to claim 1, it is characterized in that in step a, RNC under each logic district state information of Node B is uploaded to by Iub interface, directly undertaken by Iur interface or CN between adjacent R NC alternately.
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| GB2509955B (en) | 2013-01-18 | 2015-05-13 | Broadcom Corp | Methods, apparatus and computer programs for use in measurement reporting |
| CN103297975B (en) * | 2013-05-24 | 2016-07-06 | 上海交通大学 | The distribution method of macrocellular millimicro honeycomb co-existin networks frequency spectrum and access permission |
| CN103858461B (en) | 2013-12-12 | 2018-10-19 | 华为技术有限公司 | Neighboring BS relationship optimization method and device |
| CN105282791A (en) * | 2014-07-25 | 2016-01-27 | 中兴通讯股份有限公司 | Load balancing method and device |
| CN105323811B (en) * | 2014-07-28 | 2019-03-08 | 普天信息技术有限公司 | A kind of method of channel switching |
| CN105744574B (en) * | 2014-12-09 | 2020-11-06 | 中兴通讯股份有限公司 | Neighbor cell optimization method and device |
| CN106686625B (en) * | 2016-11-30 | 2020-06-26 | 上海华为技术有限公司 | Method and base station for detecting adjacent cell interference |
| CN112135313A (en) * | 2019-06-24 | 2020-12-25 | 中兴通讯股份有限公司 | Cell channel quality acquisition method, device, equipment and storage medium |
| CN112188569B (en) * | 2019-07-05 | 2023-11-21 | 北京三星通信技术研究有限公司 | Communication method and apparatus in wireless communication network |
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