CN103533594B - Based on the vehicle-mounted mobile relay switching method of user's mobile status perception - Google Patents
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Abstract
The present invention relates to a kind of vehicle-mounted mobile relay switching method based on the perception of user's mobile status, belong to wireless communication technology field.The method comprises user and to get on the bus switching: Public Transit Bus Stopping AT STATION position time, user detects the RSRP from this mobile relay, and reports current serving BS; If the RSRP reported is less than the threshold value starting timer T1, then opening timing device T1; Within the time of T1, serving BS judges the state of user according to the RSRP result received, if user is positioned on car, serving BS arranges according to the handoff parameter of this user and meets the condition of switch decision, carries out switch decision to this user; And result is sent to mobile relay, mobile relay, according to handoff decision result, carries out hand-off process to this user.User gets off switching similar procedure.The switching problem when user that this method effectively can solve vehicle-mounted mobile relaying gets on or off the bus, can effectively avoid a large number of users to get on or off the bus the handoff failure that may occur simultaneously.
Description
Technical field
The present invention relates to wireless communication technology field, and relate to a kind of vehicle-mounted mobile relay switching method based on the perception of user's mobile status particularly.
Background technology
Than mobile communication system in the past, LTE-Advanced(Long Term Evolution project strengthens technology) high frequency carrier that covering power can be used poor and support the demand of high data rate traffic, therefore need to dispose more macro base station.The wired backhaul of conventional macro base station brings larger deployment difficulty and lower deployment cost to operator, and the flexibility that macro base station is disposed also is subject to larger restriction.Therefore 3GPP(third generation partner program) research of relaying technique is started at LTE-Advanced.By using relaying technique, the coverage rate of high speed data rate services, cell boarder capacity effectively can be improved, and the problems such as when solving emergency situations, casual network is disposed, group moves, the covering of new region.
In existing LTE-Advanced system, most relaying is all fixed relay, and it well completes the secondary role of base station, greatly improves the speech quality of communication system.But along with research and development and the introducing of 3G, 4G, the continuous increase of communication in wireless networks quality requirement, needs the performance and the service quality that constantly strengthen communication system.Need to consider that the mobility of relaying is to improve the capacity of communication system and to increase the coverage of network under the mobile context that some are special.The target of mobile relay non-proxy fixed relay, but solution ensures speech quality better as a supplement.The networking object of mobile relay is to realize good service quality with lower deployment and maintenance cost.
Mobile relay of today is mainly used on bullet train, its objective is when characteristic of channel generation Rapid Variable Design, ensures communication quality and the reliability of mobile phone users (hereinafter referred to as user).And in the research of present amorphous community, mainly in the new network framework of mobile node and stationary nodes composition, consider the challenge that the introducing of mobile relay technology brings to existing communication system.User along with indefiniteness node motion be an important scene in the middle of the research of amorphous community.That mobile relay is deployed on bus to the concrete consideration of this scene.But consider the characteristic of urban transportation and the particular surroundings of bus, the existing mobile relay research be applied on bullet train obviously can not meet the demand of this scene.
The research of existing mobile relay, little about the switch decision problem between mobile relay and fixed base stations, the mobile relay especially brought in conjunction with Chinese city public transport characteristic and fixed base stations and travelling carriage and the quick switching problem of fixed base stations.Nowadays for the colony switch decision problem of mobile relay between two fixed base stations, there has been some researchs.But its switch decision process does not consider concrete application scenarios.Under the scene of vehicle-mounted mobile relaying, very large switchable load can be brought to mobile-relay system when a large number of users is got on or off the bus, may the problems such as handoff failure be occurred.Carrying out the problem of the switch decision between mobile relay and fixed base stations about a large number of users when getting on or off the bus, under the scene of high-speed mobile, having some to study.But time on the bus that current mobile relay is deployed in low speed movement, the change due to application scenarios result in existing research and can not satisfy the demands.Therefore, in conjunction with concrete bus application scenarios and LTE-AdvancedType1(Class1) mobile relay handoff procedure, designing one, can to solve the get on or off the bus changing method of switching problem of user in vehicle-mounted mobile relay system be highly significant.
The present invention is based on LTE-Advanced mobile-relay system.Relaying and DeNB(host base station) between there is X2 and S1 interface, X2 and S1 of relaying terminates in DeNB place.DeNB provides the agent functionality of S1 and X2 for relaying, and namely DeNB acts on behalf of the function on a series of S1, X2 interface, comprising: be that relaying transmits user's Special S 1 signaling, X2 signaling information, and GTP(general packet radio service tunnel agreement) packet.Therefore, for relaying, DeNB is its mobile management entity (forS1) and base station (forX2), is also its gateway.
Summary of the invention
The object of the invention is the weak point for overcoming prior art, designing a kind of vehicle-mounted mobile relay switching method based on the perception of user's mobile status.The user that described method effectively can solve vehicle-mounted mobile relaying carries out the switching problem of getting on or off the bus, and adopts user and service classification mechanism to ensure the business demand of different user, can effectively avoid a large number of users to get on or off the bus the handoff failure that may occur simultaneously.
Due to the mobility of vehicle-mounted relaying, in user gets on or off the bus the process that switches, setting mobile relay only serves those users onboard, reduces the generation of pingpang handoff.
A kind of vehicle-mounted mobile relay switching method based on the perception of user's mobile status that the present invention proposes, mobile relay is deployed on vehicle, mobile relay when getting on or off the bus for mobile phone users and the switching between fixed base stations, it is characterized in that, comprise the get on the bus switching of handoff procedure and user of user and to get off the switching of handoff procedure;
The get on the bus switch step of handoff procedure of described user comprises:
11) when mobile relay along with Public Transit Bus Stopping AT STATION position time, user detects the reference signal receiving intensity (RSRP) from this mobile relay, and testing result is reported current serving BS;
12) if the RSRP of the reporting of user of now serving BS reception is less than the threshold value of the startup timer T1 that serving BS pre-sets, then serving BS opening timing device T1; Within the time that timer T1 sets, the RSRP result of the mobile relay that serving BS detects according to the user received judges the state of user, if user keeps stable from the change of the received signal strength of mobile relay in this timer time, then serving BS judges that user is positioned on car, serving BS carries out switch decision to this user, goes to step 13); Otherwise serving BS judges that user is not positioned on car, and serving BS does not carry out switch decision to this user;
13) first serving BS is arranged switch decision parameter: serving BS arranges the switch decision parameter of this user according to the division of the user gradation in user message table and user's grade of service used,
14) serving BS is arranged according to the handoff parameter of this user, carries out switch decision to this user after the time interval waiting switching to be triggered;
15) if this user meets the condition of switch decision, handoff decision result is sent to mobile relay by serving BS, and send this user's handover request to this mobile relay, mobile relay receives the handover request message that serving BS is sent, according to the handoff decision result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table;
The get off switch step of handoff procedure of user comprises:
21) before car two arrives at a station, mobile relay first inquires about the historical information of this interchange of position by interchange of position history information table, in advance current user message table is informed to the base station near the interchange of position being about to arrive at a station; When user gets off, little and channel condition the is good base station of load is selected to switch as target BS according to interchange of position history information table;
22) user detects the RSRP from target BS, and testing result is reported mobile relay, and mobile relay judges the state of the user needing to switch from the RSRP result that target BS receives according to user;
23) if the threshold value of startup timer T2 that pre-sets of the DeNB that the RSRP of reporting of user that now mobile relay receives is less than mobile relay, the DeNB of mobile relay starts timer T2, User Status is judged: if user is stable from the signal strength signal intensity that target BS receives at this moment in the setting-up time of timer T2, then judge user be positioned at car under and carry out switch decision, go to step 24); Otherwise judge that user does not get off, mobile relay does not process the handover request of user;
24) first mobile relay carries out the setting of handoff parameter according to the user gradation in user message table and grade of service information used;
25) mobile relay carries out switch decision according to the handoff parameter setting of this user and switch decision condition to this user;
26) if this user meets the condition of switch decision, handoff decision result is sent to the target BS of switching by mobile relay by DeNB, and send this user's handover request to this target BS, target BS receives the handover request message that mobile relay is sent, according to the handoff decision result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table.
Feature of the present invention and beneficial effect:
Switch decision problem when the user that described method effectively can solve the vehicle-mounted mobile relaying of low speed movement gets on or off the bus, and adopt user and service classification mechanism to ensure the business demand of different user, can effectively avoid a large number of users to get on or off the bus the handoff failure that may occur simultaneously.
Accompanying drawing explanation
Fig. 1 is the switch step schematic diagram of the user of the inventive method when getting on the bus between mobile relay and eNodeB;
Fig. 2 is the switch step schematic diagram of the user of the inventive method when getting off between mobile relay and eNodeB;
Fig. 3 is the user of the inventive method is switched to eNodeB signaling process figure from mobile relay.
Embodiment
Below, be deployed on bus for mobile relay and set forth the vehicle-mounted mobile relay switching method based on the perception of user's mobile status of the present invention.In mobile relay application scenarios, the bus disposing mobile relay stops position AT STATION, and now mobile phone users (hereinafter referred to as user) is got on or off the bus; The present embodiment comprises the get on the bus switching of handoff procedure and user of user and to get off the changing method of handoff procedure;
User get on the bus handoff procedure switch step as shown in Figure 1.Comprise:
11) when mobile relay along with Public Transit Bus Stopping AT STATION position time, user detects the RSRP(reference signal receiving intensity from this mobile relay), and testing result is reported current serving BS (serving BS pre-sets the threshold value α starting timer T1, and this threshold value value of embodiment is-140dBm);
12) if the RSRP of the reporting of user of now serving BS reception is less than threshold value, i.e. RSRP
serving< α, serving BS opening timing device T1; Within the time that timer T1 sets, the RSRP result of the mobile relay that serving BS detects according to the user received judges the state of user, if user is stable (change being set to RSRP value embodiment remains within 10dBm) from the received signal strength of mobile relay in this timer time, then serving BS judges that user is positioned on car, serving BS carries out switch decision to this user, goes to step 13); Otherwise serving BS judges that user is not positioned on car, and serving BS does not carry out switch decision to this user;
13) before serving BS carries out switch decision to different user, switch decision parameter is arranged: the switch decision parameter of setting comprises switching bias Bias, switches lag parameter Hys and time interval parameter TTT; Serving BS arranges the switch decision parameter of this user according to the division of the user gradation in user message table and user's grade of service used, and user message table particular content is as shown in table 1:
Table 1 user message table
In Table 1, user gradation 1 refers to VIP user, and user gradation 2 refers to domestic consumer.Wherein, the paying customer that VIP user serves for bus mobile relay, and the non-additional payment of domestic consumer.User's type of service used can be divided into basic business and non-basic business.Specifically, basic business refers to that the requirement of real-times such as audio call are high and to switching responsive business, but not basic business refers to that data download etc. is not high but to have certain requirements business to data rate to requirement of real-time.For non-basic business, by business QCI(service quality rating mark) grade further divides.According to LTE-Advanced standard, the QCI of business is divided into 9 grades, and QCI value is higher, lower to data rate requirement.
The concrete steps of switch decision optimum configurations are as follows:
A) type of this user is first judged: obtain this user as VIP user or domestic consumer according to user message table; Arrange the time interval parameter TTT(triggering switching to arrange according to 3GPPLTER12 the basic value that different user arranges the time interval parameter TTT(TTT parameter that different triggerings switches according to the type of this user), make triggering interval T TT switching time of VIP user be less than triggering interval switching time of domestic consumer);
If what b) this user was used is basic business, then arranges and switch lag parameter Hys(to arrange standard be arrange relevant regulations according to 3GPPLTER12 handoff parameter), for reducing this user's switching times;
If what c) this user was used is non-basic business, then switching bias Bias(bias Bias is set and carries out mapping according to the QCI of the type of service of the current use of user in user message table to obtain), mapping relations are as shown in table 2 below:
Table 2 business QCI is to the mapping table switching bias
| Business QCI | Switch bias (dB) |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 2 |
| 7 | 4 |
| 8 | 4 |
| 9 | 4 |
14) serving BS is arranged according to the handoff parameter of this user, carries out switch decision to this user after the time interval waiting switching to be triggered; , switch decision condition is:
RSRP
T＞RSRP
S+Bias+Hys
Wherein, RSRP
tthe measurement result of user to the Reference Signal Received Power from mobile relay, RSRP
sthe measurement result of user to the Reference Signal Received Power from serving BS;
15) if this user meets the condition of switch decision, handoff decision result is sent to mobile relay by serving BS, and send this user's handover request to this mobile relay, mobile relay receives the handover request message that serving BS is sent, according to the handoff decision result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table;
User message table sets up between mobile relay and serving BS, jointly safeguarded by both.
In the inventive method, mobile relay carries out hand-off process to different users respectively according to user message table and handover request.Due to the resource-constrained of mobile relay, VIP user accesses first considering by mobile relay, then accesses domestic consumer.After finishing switching, mobile relay upgrades user message table.
User get off handoff procedure switch step as shown in Figure 2.Comprise:
21) before bus arrival, mobile relay first inquires about the historical information of this interchange of position by interchange of position history information table, in advance current user message table is informed to the base station near the interchange of position being about to arrive at a station; Interchange of position history information table is as shown in table 3 below:
Table 3 interchange of position history information table
| Bus moving direction | Station name | Base station near station |
| Outbound | Xx stands | ID_1、ID_36 |
| Outbound | Xx stands | ID_13、ID_24 |
| Outbound | …… | …… |
| Return | Xx stands | ID_9 |
| Return | Xx stands | ID_17、ID_5 |
| Return | …… | …… |
Consider that a large number of users is got on or off the bus situation, when user gets off, mobile relay selects load less according to interchange of position history information table and the best base station of channel condition switches as target BS; The selection of target BS is specific as follows:
The user type of the user message table that each base station 21-1) near this station sends according to mobile relay and user's type of service used distribute the running time-frequency resource required for switching (concrete grammar of Resources allocation is according to 3GPP standard regulation);
The base station that 21-2) mobile relay prioritizing selection channel condition is best is as the target BS switched;
21-3) whether fully loaded (namely not having enough resources to carry out hand-off process to user) mobile relay judges this base station now, if fully loaded, the mobile relay base station that in other underload base stations, selective channel condition is best in this region is as the target BS switched; Otherwise select this base station as the target BS switched;
22) user detects the RSRP from target BS, and testing result is reported the threshold value that mobile relay (the DeNB(host base station of mobile relay) pre-sets startup timer T2, (this threshold value value of embodiment is-140dBm), mobile relay judges the mobile status of the user needing to switch from the RSRP result that target BS receives according to user;
23) if the RSRP of the reporting of user of now mobile relay reception is less than threshold value, i.e. RSRP
serving< β, the DeNB of mobile relay starts timer T2, in the setting-up time of timer T2, judge User Status: if user is stable (establishing the change of RSRP value to remain within 10dBm embodiment) from the signal strength signal intensity that target BS receives at this moment, then judge user be positioned at car under and carry out switch decision, go to step 24); Otherwise judge that user does not get off, mobile relay does not process the handover request of user;
24) before mobile relay carries out switch decision, first mobile relay carries out the setting of handoff parameter according to the user gradation in user message table and grade of service information used; The detailed process that handoff parameter is arranged and the user step that handoff parameter arranges of getting on the bus is identical, is not repeated herein.
25) mobile relay is arranged according to the handoff parameter of this user, carries out switch decision to this user, and switch decision condition is as identical in user's process of getting on the bus, and is not repeated herein.
26) if this user meets the condition of switch decision, handoff decision result is sent to the target BS of switching by mobile relay by DeNB, and send this user's handover request to this target BS, target BS receives the handover request message that mobile relay is sent, according to the handoff decision result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table.
The handoff process of this invention is based on LTE-Advanced relay system, and concrete hand off signaling is mutual as shown in Figure 3, and relaying is made switch decision according to the examining report of user and selected a Target cell; Handover request message is dealt into DeNB by mobile relay, and from then on DeNB reads the ID of Target cell in message and find target BS, then sends X2 message to target BS.Wherein, mobile relay only needs maintenance one to the X2 interface of DeNB, and it all can issue DeNB all handover request, and need not consider the ID of Target cell.Target cell receives this request message, and the user under it similarly is a DeNB will ask to switch.After the signalling of X2 terminates, just set up to the forward tunnel of target BS from relaying through DeNB.This GTP tunnel is changed at DeNB place.Because DeNB can be linked into the forward tunnel of each user and it can know ongoing handoff procedure by X2-AP message, the path of forwarding of packets can be more convenient.
The vehicle-mounted mobile relay swicthing decision method based on the perception of user's mobile status that the present invention proposes can be used for city bus truck system.Wherein, based on the switch determining method of user's classification and service classification also can be used for bullet train and Large-sized Communication instrument arrive at a station a large number of users in situation get on or off the bus time, have the scene of a large amount of handover request within a short period of time.The user that described method effectively can solve vehicle-mounted mobile relaying carries out the switching problem of getting on or off the bus, and adopts user and service classification mechanism to ensure the business demand of different user, can effectively avoid a large number of users to get on or off the bus the handoff failure that may occur simultaneously.The description of above-mentioned specific implementation method is understood for the ease of these those skilled in the art and applies this invention.The improvement that those skilled in the art makes the present invention and amendment all should within protection scope of the present invention.
Claims (4)
1. the vehicle-mounted mobile relay switching method based on the perception of user's mobile status, mobile relay is deployed on vehicle, mobile relay when getting on or off the bus for mobile phone users and the switching between fixed base stations, it is characterized in that, comprise the get on the bus switching of handoff procedure and user of user and to get off the switching of handoff procedure;
The get on the bus switch step of handoff procedure of described user comprises:
11) when mobile relay along with Public Transit Bus Stopping AT STATION position time, user detects the reference signal receiving intensity (RSRP) from this mobile relay, and testing result is reported current serving BS;
12) if the RSRP of the reporting of user of now serving BS reception is less than the threshold value of the startup timer T1 that serving BS pre-sets, then serving BS opening timing device T1; Within the time that timer T1 sets, the RSRP result of the mobile relay that serving BS detects according to the user received judges the state of user, if user keeps stable from the change of the received signal strength of mobile relay in this timer time, then serving BS judges that user is positioned on car, serving BS carries out switch decision to this user, goes to step 13); Otherwise serving BS judges that user is not positioned on car, and serving BS does not carry out switch decision to this user, terminate;
13) first serving BS is arranged switch decision parameter: serving BS arranges the switch decision parameter of this user according to the division of the user gradation in user message table and user's grade of service used,
14) serving BS is arranged according to the handoff parameter of this user, carries out switch decision to this user after the time interval waiting switching to be triggered;
15) if this user meets the condition of switch decision, handoff decision result is sent to mobile relay by serving BS, and send this user's handover request to this mobile relay, mobile relay receives the handover request message that serving BS is sent, according to the result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table;
The get off switch step of handoff procedure of user comprises:
21) before vehicle arrives at a station, mobile relay first inquires about the historical information of this interchange of position by interchange of position history information table, in advance current user message table is informed to the base station near the interchange of position being about to arrive at a station; When user gets off, little and channel condition the is good base station of load is selected to switch as target BS according to interchange of position history information table;
22) user detects the RSRP from target BS, and testing result is reported mobile relay, and mobile relay judges the mobile status of the user needing to switch from the RSRP result that target BS receives according to user;
23) if the threshold value of startup timer T2 that pre-sets of the DeNB that the RSRP of reporting of user that now mobile relay receives is less than mobile relay, the DeNB of mobile relay starts timer T2, User Status is judged: if user is stable from the signal strength signal intensity that target BS receives at this moment in the setting-up time of timer T2, then judge user be positioned at car under and carry out switch decision, go to step 24); Otherwise judge that user does not get off, mobile relay does not process the handover request of user, terminate;
24) first mobile relay carries out the setting of handoff parameter according to the user gradation in user message table and grade of service information used;
25) mobile relay carries out switch decision according to the handoff parameter setting of this user and switch decision condition to this user;
26) if this user meets the condition of switch decision, handoff decision result is sent to the target BS of switching by mobile relay by DeNB, and send this user's handover request to this target BS, target BS receives the handover request message that mobile relay is sent, according to the result that this User Status detects, mobile relay carries out hand-off process to this user, and upgrades the user's Current Serving BTS in user message table.
2. method as claimed in claim 1, is characterized in that, described step 13) or 24) the switch decision parameter that arranges comprises and switch bias Bias, switch lag parameter Hys and time interval parameter TTT; The concrete steps of switch decision optimum configurations are as follows:
A) type of this user is first judged: obtain this user as VIP user or domestic consumer according to user message table; The time interval parameter TTT triggering and switch is set according to the type of this user;
If what b) this user was used is basic business, then arranges and switch lag parameter Hys, for reducing this user's switching times;
If what c) this user was used is non-basic business, then arrange and switch bias Bias, bias Bias carries out mapping according to the QCI of the type of service of the current use of user in user message table to obtain.
3. method as claimed in claim 2, is characterized in that, described step 14) or step 25) switch decision condition be:
RSRP
T>RSRP
S+Bias+Hys
Wherein, RSRP
tthe measurement result of user to the Reference Signal Received Power from mobile relay, RSRP
sthe measurement result of user to the Reference Signal Received Power from serving BS.
4. method as claimed in claim 1, is characterized in that, described step 21) in the selection of target BS specific as follows:
The user type of the user message table that each base station 21-1) near this station sends according to mobile relay and user institute
The running time-frequency resource required for switching is allocated in advance by type of service;
The base station that 21-2) mobile relay prioritizing selection channel condition is best is as the target BS switched;
21-3) mobile relay judges whether this base station is now fully loaded with, if fully loaded, the mobile relay base station that in other underload base stations, selective channel condition is best in this region is as the target BS switched; Otherwise select this base station as the target BS switched.
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| CN109246650B (en) * | 2017-06-30 | 2021-09-21 | 中国电信股份有限公司 | Vehicle-to-vehicle communication method and device, relay device and vehicle-to-vehicle communication system |
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