CN101505515B - Mobile station and handover method therefor when moving between central access points - Google Patents
Mobile station and handover method therefor when moving between central access points Download PDFInfo
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- CN101505515B CN101505515B CN2009100762678A CN200910076267A CN101505515B CN 101505515 B CN101505515 B CN 101505515B CN 2009100762678 A CN2009100762678 A CN 2009100762678A CN 200910076267 A CN200910076267 A CN 200910076267A CN 101505515 B CN101505515 B CN 101505515B
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Abstract
The invention discloses a mobile station and a switching method when the mobile station moves between central access points, and belongs to the field of mobile communication. The method comprises that: the mobile station acquires current position information of the mobile station and position information of a current central access point providing service for the mobile station; position information of a central access point adjacent to the current central access point is determined according to the position information of the current central access point; and when that the current position of the mobile station enters service coverage of the adjacent central access point is confirmed, the service of the mobile station is switched to be provided by the adjacent central access point. The method takes the acquired position information of the mobile station as a switching triggering condition to realize quick switching of the mobile station at a high speed between adjacent central accesspoints, and has the characteristics of short switching time delay and good switching real-time.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of travelling carriage and the changing method when mobile between central access point.
Background technology
Development of Communication Technique has greatly promoted development of scientific research, and various access network technologies have been enriched in the generation of wireless technology especially, and people can be communicated with wireless mode is free more unobstructedly, has also produced tremendous influence for people's life.
For guaranteeing communication continuity, switching problem becomes the problem that radio communication must solve.In moving process, original data flow need be switched on different transmission paths, could make travelling carriage STA when moving to new position, still can obtain the proper communication service.No matter existing wireless communication technology is cellular network, and still emerging WLAN (wireless local area network) all is to adopt the method for received signal level or energy measuring to trigger handoff procedure.Promptly in original service range, drop to certain threshold value when following when quality of signals, seek newly, and carry out handover operation for it provides the central access point of service.
Support the IEEE802.11 working group of wireless access way to be born from 1997, the continuous evolution of standard such as 802.11b/a/g/n subsequently is perfect, and the wireless access way of WLAN (wireless local area network) WLAN is rooted in the hearts of the people, and the performance of the scope of application and wireless access is become better and better.But this serial protocols has at first only provided the codes and standards of wireless access, does not consider ambulant needs too much.Proposition up to 802.11f/r, just beginning provides support to the minizone switching of WLAN, 802.11f (IAPP) and 802.11r in agreement, all stipulated in each central access point (AP, the suggestion of handoff procedure between the Basic Service Set that AccessPoint) provides (BSS).802.11f/r agreement regulation, when travelling carriage (STA) need carry out transfer of data by central access point (AP), must at first to pass through two steps of authentication (authentication) and related (association), the effect of authentication is the access legitimacy that guarantees communicating pair, related effect is binding central access point AP and travelling carriage STA, makes the transmission of data correctly to select AP to pay.
Processing procedure when the travelling carriage STA that 802.11f (IAPP) agreement is provided below in conjunction with Fig. 1 switches between the Basic Service Set BSS that the central access point AP of neighbor cell provides describes:
(1) trigger condition that 1 expression is switched among Fig. 1, STA and current AP1 communicate in the process, when the discovery quality of signals descends, and when being lower than the threshold value of setting, will start the flow process of switching between whole BSS;
(2) 2 expression STA communicate with new AP2 among Fig. 1, the proposition handoff request;
(3) among Fig. 13 expression AP1 and AP2 by the RADIUS authentication server on upper strata, at the corresponding relation between distribution session key and BSSID and the IP address between the AP;
(4) 4 be illustrated in the passage of setting up TCP or UDP between AP1 and the AP2 among Fig. 1, with the authentication information of STA, related information and between transfer period, the needs of staying on the AP1 are passed to the data cached of STA, pass to AP2;
(5) 5 expression AP1 remove various associations and the authorization data of STA in BSS1, finishing switching among Fig. 1.
802.11f have following several defectives and problem:
(1) authentication takes place in the moment of switching with related process, causes decrease in efficiency;
(2) owing to used high-rise radius server, make the complexity of AP equipment improve greatly, complete IP stack must be provided, and more high-rise radius client;
(3) when switching, need set up the passage of TCP/UDP, and have high-rise agreement to add, make handover delay increase greatly, also whole system is limited in the IP agreement simultaneously, reduced the flexibility of design of protocol.
From above-mentioned introduction as can be known, 802.11f (IAPP) the flow process complexity between the Basic Service Set BSS that the central access point AP of neighbor cell provides, switched of the travelling carriage STA that provides of agreement, the protocol hierarchy that relates to is higher, makes that the process time delay of switching is bigger, is difficult to satisfy the needs of QoS.Though it provides a kind of scheme for switching between the BBS of WLAN, can't guarantee the demand of the business that real-time such as VoIP is had relatively high expectations.
For overcoming the problem that exists in 802.11f (IAPP) agreement, IEEE has made the 802.11r agreement, this agreement has been inherited the thought of 802.11f agreement, some improvement have been done, make under better condition, handover delay from second level reduce in the 50ms, satisfied the requirement of some real-time services such as VoIP.Therefore, when existing travelling carriage STA switches between the Basic Service Set BSS that the central access point AP of sub-district provides, the hand-off process flow process that all adopts 802.11r to provide.
The hand-off process flow process that provides with 802.11r agreement shown in Figure 2 is an example below, and when travelling carriage STA was moved, the process of switching between the different Basic Service Set BSS that adjacent central access point AP provides described:
(1) trigger condition that 1 expression is switched among Fig. 2, STA and current AP1 communicate in the process, when the discovery quality of signals descends, and when being lower than the threshold value of setting, will start the flow process of switching between whole BSS;
(2) 2 expression STA communicate with new AP2 among Fig. 2, the proposition handoff request, and this request both can directly send to AP2 by STA, also can be transmitted to AP2 by AP1;
(3) 3 expression AP1 and AP2 contact directly among Fig. 2, distribution session key and authentication mutually, and with the authentication information of STA, related information and between transfer period, the needs of staying on the AP1 are passed to the data cached of STA, pass to AP2;
(4) 4 expression AP1 remove various associations and the authorization data of STA in BSS1 among Fig. 2, and switching is finished.
802.11r agreement has mainly been done following some improvement with respect to the 802.11f agreement:
(1) with the function of radius server, decompose the inside of each AP, reduced like this and set up the expense that the upper strata connects between transfer period, and the distribution of session key wants consumed time, the minimizing of middle cumbersome procedure also means the possibility minimizing that network is under attack;
(2) owing to need in handoff procedure, not set up TCP or UDP and connect, make network layer design and select for use and become more flexible, though IP becomes desirable selection, can't allow handoff procedure be confined on the IP agreement;
(3) use Fast Transition agreement and Fast Transition Resource Request agreement, on original basis, resource reservation is built into handoff protocol inside, for QoS provides further guarantee;
Adopt new authentication mechanism and relation mechanism, allowed before actual switching, between AP, transmitted authentication and the related information of STA in advance, the expense when further having shortened actual the switching.
The handoff procedure of above-mentioned handling process can be divided into following several stages substantially:
(1) the T1 stage, STA selects suitable switching AP, be that STA need be from all AP tabulations, select a proper A P, as the target AP that will switch, the trigger condition of switching is the signal quality of communicating by letter with current AP, when signal quality during less than certain threshold value, will start T1, and then start whole handoff procedure.Select AP, the mode of both can having taken the initiative (active scan) also can be taked passive mode (passive scan); When adopting aggressive mode, STA sends the scan frame on one's own initiative on each channel, and waits for the regular hour, and the acknowledgement frame that acceptance may occur is judged that best channel of signal quality, and with the AP that works on this channel, as the target AP of switching; When adopting Passive Mode, STA waits for the regular hour on the channel of each different frequency, receive the beacon frame that may occur on each channel, judges that best channel of signal quality, and with the AP that works on this channel, as the target AP of switching;
(2) in the T2 stage, STA sends application, notifies new AP by certain mode (can be direct, also can by existing AP);
(3) the T3 stage, existing AP and new AP communicate, and transmit relevant authentication and the related information of STA;
(4) the T4 stage, STA is gone association from existing AP, finish switching.
If the overall delay that switches is made as T, the time delay of then top four steps is respectively T1, T2, T3, T4, and the overall delay that so rough estimation is switched can be the summation of top four step time delays, that is:
T＝T1+T2+T3+T4
By above-mentioned analysis to 802.11f and 802.11r, the improved emphasis of switching mode of the existing as can be seen relative 802.11f agreement of 802.11r agreement mainly is to be placed on T2 and T3 in the middle of two stages, and this stage of T1 does not obtain paying attention to.
And the inventor finds, in the T1 stage, the pattern of no matter taking the initiative or passive module, STA all can wait for the frame that may occur on different channels, like this because the process of whole scanning is quite very long, under worst situation, may reach 70%～80% of whole switching time, cause time delay for switching longer, therefore this based on input as handover triggering condition, scan the channel of each communication, when signal quality during less than certain threshold value, just start the mode of whole handoff procedure, exist whole handoff procedure time delay longer, influence communication continuity and real-time, reduce the problem of user experience.
Summary of the invention
Based on above-mentioned existing in prior technology problem, the purpose of embodiment of the present invention provides a kind of travelling carriage and the changing method when mobile between central access point, reduce the handover delay of whole handoff procedure, improve travelling carriage communication continuity and real-time in moving.
The objective of the invention is to be achieved through the following technical solutions:
Embodiment of the present invention provides a kind of travelling carriage changing method when mobile between central access point, comprising:
Travelling carriage obtains the current location information of self and the positional information of the current central access point of service is provided for this travelling carriage;
Determine the positional information of the central access point adjacent with this current central access point according to the positional information of described current central access point;
When the current location of confirming travelling carriage entered the service coverage of described adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provided.
Determine that according to the positional information of current central access point the positional information of the central access point adjacent with this current central access point further comprises in the described method:
According to the positional information of the central access point of determining adjacent, determine the service coverage of adjacent central access point with this current central access point.
Described method also comprises: after determining adjacent central access point according to the positional information of current central access point, the current central access point information that the switching of travelling carriage is required is sent to adjacent central access point before travelling carriage switches.
Described current central access point is sent to adjacent central access point with the switching of travelling carriage with information and specifically comprises: authentication information and related information that current central access point will be switched the travelling carriage of usefulness are sent to the central access point adjacent with this current central access point.
In the described method, travelling carriage obtains the current location information of self and for this travelling carriage provides the positional information of the current central access point of service, and the positional information of the central access point adjacent with current central access point all locate mode or cellular localization mode obtain via satellite.
Described satellite fix mode comprises: global positioning satellite GPS or big-dipper satellite location CNSS.
Embodiment of the present invention also provides a kind of travelling carriage, comprising:
Wireless communication unit, positioning unit and switching treatmenting unit;
Described wireless communication unit communicates to connect with described switching treatmenting unit, is used for and provide the central access point of service to carry out radio communication;
Described positioning unit, communicate to connect with described switching treatmenting unit, be used to obtain the current location information of travelling carriage self and for this travelling carriage provides the positional information of the current central access point of service, and determine the positional information of the central access point adjacent according to the positional information of described current central access point with this central access point;
Described switching treatmenting unit, communicate to connect with described wireless communication unit and positioning unit respectively, be used for when the current location of the travelling carriage of confirming to obtain according to positioning unit enters the service coverage of adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provides.
Described travelling carriage also comprises: the coverage determining unit, be connected with described positioning unit, and be used for positional information according to the definite central access point adjacent of described positioning unit with current central access point, determine the service coverage of adjacent central access point.
Described positioning unit is satellite locator or cellular localization device.
Described satellite locator comprises: global positioning satellite device GPS or big-dipper satellite locator CNSS.
The technical scheme that is provided by the invention described above embodiment as can be seen, in the embodiment of the present invention with the positional information of the travelling carriage that obtains as handover triggering condition, the positional information that the central access point of radio communication service is provided with travelling carriage is a foundation, realize that travelling carriage is in high-speed mobile, when between adjacent central access point, switching, owing to do not need the signal of channel is scanned, detects, saved sweep time, reduced time delay for switching, make handoff procedure rapid, guaranteed communication continuity and real-time.
Description of drawings
Travelling carriage in the 802.11f agreement that Fig. 1 provides for prior art switches schematic diagram;
Travelling carriage in the 802.11r agreement that Fig. 2 provides for prior art switches schematic diagram;
Fig. 3 is the schematic diagram that the travelling carriage of the embodiment of the invention switches between central access point;
Fig. 4 is the structured flowchart of the travelling carriage of the embodiment of the invention.
Embodiment
The embodiment of the invention a kind of travelling carriage is provided and between central access point the changing method when mobile, this changing method comprises:
Travelling carriage obtains the current location information of self and the positional information of the current central access point of service is provided for this travelling carriage;
Determine the positional information of the central access point adjacent with this current central access point according to the positional information of described current central access point;
When the current location of confirming travelling carriage entered the service coverage of described adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provided.
In the above-mentioned changing method, with the positional information of travelling carriage as handover triggering condition, avoided adopting in traditional changing method input as handover triggering condition, scan the channel of each communication, when signal quality during less than certain threshold value, just start the mode of whole handoff procedure, exist whole handoff procedure time delay longer, influence communication continuity and real-time, reduce the problem of user experience, this method effectively reduces travelling carriage time delay for switching between two central access point, communication continuity and real-time in guaranteeing to switch.
For ease of the understanding to embodiment of the present invention, the invention will be further described below in conjunction with the drawings and specific embodiments.
Embodiment one
Present embodiment provides a kind of travelling carriage changing method when mobile between central access point, comprising:
Travelling carriage obtains the current location information of self and the positional information of the current central access point of service is provided for this travelling carriage;
Determine the positional information of the central access point adjacent with this current central access point according to the positional information of described current central access point; In the reality, can be in advance the positional information of each central access point be stored in the travelling carriage STA, when needed, can be by the positional information of current central access point AP, come to determine the positional information of the central access point adjacent with this central access point AP, also can be by communicating by letter with current central access point AP in the process of moving, obtain the positional information of current central access point after, according to the positional information of each central access point of storing in advance, obtain the positional information of adjacent AP again;
When the current location of confirming travelling carriage entered the service coverage of described adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provided.
In said method, can be after determining the positional information of the central access point adjacent with this current central access point according to the positional information of current central access point, utilize the positional information of this adjacent central access point, determine the service coverage of the central access point that this is adjacent.
In the said method, after determining adjacent central access point according to the positional information of current central access point, current central access point will be switched the travelling carriage of usefulness before travelling carriage switches authentication information and related information are sent to adjacent central access point, are used for the switching of travelling carriage.
In the said method, travelling carriage obtains the current location information of self and for this travelling carriage provides the positional information of the current central access point of service, and the positional information of the central access point adjacent with current central access point all locate mode or cellular localization mode obtain via satellite; Wherein, the satellite fix mode can adopt global positioning satellite GPS or Chinese big-dipper satellite location CNSS.
Present embodiment also provides a kind of travelling carriage, and this travelling carriage can be used for realizing above-mentioned changing method, as shown in Figure 4, specifically comprises:
Wireless communication unit, positioning unit and switching treatmenting unit;
Wherein, wireless communication unit and described switching treatmenting unit communicate to connect, and are used for and provide the central access point of service to carry out radio communication;
Positioning unit and described switching treatmenting unit communicate to connect, be used to obtain the current location information of travelling carriage self and for this travelling carriage provides the positional information of the current central access point of service, and determine the positional information of the central access point adjacent according to the positional information of described current central access point with this central access point;
Switching treatmenting unit communicates to connect with described wireless communication unit and positioning unit respectively, be used for when the current location of the travelling carriage of confirming to obtain according to positioning unit enters the service coverage of adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provides.
On the basis of above-mentioned travelling carriage, the coverage determining unit can also be set, it is connected with described positioning unit, is used for the positional information according to the definite central access point adjacent with current central access point of described positioning unit, determines the service coverage of adjacent central access point.
In the reality, positioning unit can adopt satellite locator or cellular localization device; Wherein, satellite locator can adopt global positioning satellite device GPS or Chinese big-dipper satellite locator CNSS.
Below in conjunction with in the reality with travelling carriage the handoff procedure during as vehicle-mounted travelling carriage, the changing method in the embodiment of the invention is described further, referring to Fig. 3, be specially:
(1) when vehicle-mounted travelling carriage STA appears in the coverage of a central access point AP, central access point AP sends to authentication information and the related information of vehicle-mounted travelling carriage STA on two adjacent with it AP in advance, in Fig. 3, when in the coverage of STA at AP2, the relevant information of STA directly can be sent to AP1 and AP3;
(2) when STA arrives regional between the BSS, can determine that then STA enters the coverage of next central access point, start handoff procedure.
Be arranged on scene on the automobile of high-speed mobile with vehicle-mounted travelling carriage below, the process of switching between different central access point AP during automobile is run at high speed on highway is described further the handoff procedure of above-mentioned vehicle-mounted travelling carriage:
There is the covering of AP both sides in the expressway always, and automobile is provided with STA, when automobile STA when road is run at high speed, just need between the Basic Service Set BSS that different AP provide, switch fast.At this moment, the condition of switching not is the input that prior art adopts, the target AP of selecting also no longer needs to scan each channel, and can be with the AP position in the highway both sides, download in advance in the electronic chart of positioning unit (as adopting the GPS locator) of the STA of automobile, in running, the relative position relation of AP all as can be known, and the real time position that is loaded with the automobile of STA also can accurately be obtained by GPS (Global Position System) GPS, real time position by automobile is as handover triggering condition, when this automobile arrives the coverage of next central access point, then switch to by next central access point radio communication service is provided.As shown in Figure 3, if the hypothesis automobile travels from left to right, pass through central access point such as AP1, AP2, AP3 successively, when in the coverage of automobile at AP2, relevant authentication information has passed to AP3, therefore from AP2 when AP3 does to switch, just can omit the time delay that the transmission relevant information causes, be equivalent to the T1 in traditional changing method and the time in T3 stage have been dispensed.
Simultaneously, AP2 need pass to AP1 with authentication information, and two effects are arranged:
(1) consider two-way lane, the automobile that is loaded with vehicle-mounted travelling carriage STA might be to travel from right to left, and AP1 will become the target AP that automobile will switch so;
(2) automobile that is loaded with vehicle-mounted travelling carriage STA passes through AP1, AP2, AP3 successively, when in the coverage of automobilism at AP2, still maintain the relevant information of automobile among the AP1, therefore the purpose that authentication information is passed to once more AP1 is arranged, be notice AP1, automobile provides service by AP2, the information of STA can be deleted from AP1.
Therefore, the execution of process 1 among Fig. 3 both can have been finished the operation in T3 stage in the similar existing changing method, also can finish the operation in T4 stage in the lump.And the process that the automobile that is loaded with vehicle-mounted travelling carriage STA constantly switches in road is just constantly carried out by the mode of this relay, has realized that vehicle-mounted travelling carriage realizes the switching of little time-delay in vehicle-mounted scene of running at high speed, and has guaranteed the real-time and the continuity of communicating by letter.
The scene of only switching on the automobile of high-speed mobile with vehicle-mounted travelling carriage in the above-mentioned explanation is that example describes, but under the situation that does not break away from guiding theory of the present invention, those skilled in the art will envision that the changing method in the embodiment of the invention, go for the switching of the vehicle-mounted travelling carriage of various mobile scenes between central access point AP.As can be used for defined all scenes of 802.11f/r, also can be used for other and have travelling carriage application scenarios under the high-speed mobile environment.
The advantage of the maximum of the changing method in the embodiment of the invention is with the position of travelling carriage as the condition of switching, and is very different with the traditional method based on level detection and energy measuring.Traditional switching condition often need be followed very long scan channel, the efficient that influence is switched.Under the vehicle-mounted condition, because the speed of travelling carriage own is higher, if can not realize quick switching, causing probably normally to provide service.The changing method of the embodiment of the invention can as switching condition, save the process of scan channel with positional information in conjunction with mobile positioning techniques such as gps systems, has reduced handover delay.
In sum, in the embodiment of the invention by utilizing GPS location to obtain the positional information of travelling carriage, with positional information as handover triggering condition, travelling carriage is switched providing between the different central access point of service, the trigger condition and the switching flow of existing travelling carriage handoff procedure have been changed, time delay for switching and complexity have been reduced, the call duration time of only remaining STA of time delay for switching and target AP.And because the channel of GPS positioning unit is more stable, even delay is arranged, also can solve by certain lead is set, by this changing method, can make the travelling carriage in the high-speed mobile keep less time delay to finish switching, reduce the complexity of handover delay and channel selection procedure, had higher Practical significance.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. the travelling carriage changing method when mobile between central access point is characterized in that, comprising:
Vehicle-mounted travelling carriage obtains the current location information of self and the positional information of the current central access point of service is provided for this travelling carriage;
Determine the positional information of the central access point adjacent with this current central access point according to the positional information of described current central access point;
The current location information that described travelling carriage obtains self reaches the positional information that the current central access point of service is provided for this travelling carriage, and all locate mode acquisitions via satellite of the positional information of the central access point adjacent with current central access point;
When the current location of confirming vehicle-mounted travelling carriage entered the service coverage of described adjacent central access point, service that then will this vehicle-mounted travelling carriage switched to by described adjacent central access point and provides;
Described method also comprises: after determining adjacent central access point according to the positional information of current central access point, the current central access point relevant information that the switching of travelling carriage is required is sent to adjacent central access point before travelling carriage switches.
2. changing method according to claim 1 is characterized in that, determines that according to the positional information of current central access point the positional information of the central access point adjacent with this current central access point further comprises in the described method:
According to the positional information of the central access point of determining adjacent, determine the service coverage of adjacent central access point with this current central access point.
3. changing method according to claim 1, it is characterized in that described current central access point is sent to adjacent central access point with the switching of travelling carriage with relevant information and specifically comprises: authentication information and related information that current central access point will be switched the travelling carriage of usefulness are sent to the central access point adjacent with this current central access point.
4. changing method according to claim 1 is characterized in that, described satellite fix mode comprises: global positioning satellite GPS or big-dipper satellite location CNSS.
5. a travelling carriage is characterized in that, comprising:
Wireless communication unit, positioning unit and switching treatmenting unit;
Described wireless communication unit communicates to connect with described switching treatmenting unit, is used for and provide the central access point of service to carry out radio communication;
Described positioning unit, communicate to connect with described switching treatmenting unit, be used to obtain the current location information of travelling carriage self and for this travelling carriage provides the positional information of the current central access point of service, and determine the positional information of the central access point adjacent according to the positional information of described current central access point with this central access point; Described positioning unit is a satellite locator;
Described switching treatmenting unit, communicate to connect with described wireless communication unit and positioning unit respectively, be used for when the current location of the travelling carriage of confirming to obtain according to positioning unit enters the service coverage of adjacent central access point, then the service of this travelling carriage being switched to by described adjacent central access point provides.
6. travelling carriage according to claim 5, it is characterized in that, described travelling carriage also comprises: the coverage determining unit, be connected with described positioning unit, be used for positional information, determine the service coverage of adjacent central access point according to the definite central access point adjacent of described positioning unit with current central access point.
7. travelling carriage according to claim 5 is characterized in that, described satellite locator comprises: global positioning satellite device GPS or big-dipper satellite locator CNSS.
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| CN102869065B (en) * | 2011-07-07 | 2015-04-08 | 中国科学院上海高等研究院 | Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network) |
| CN102917428B (en) * | 2011-08-05 | 2018-03-20 | 北京新岸线移动多媒体技术有限公司 | Channel switching method and device |
| CN102316541B (en) * | 2011-08-09 | 2015-09-23 | 上海通号轨道交通工程技术研究中心有限公司 | A kind of bullet train method of handover based on GPS |
| CN104980978A (en) * | 2015-06-30 | 2015-10-14 | 青岛海尔智能家电科技有限公司 | WiFi access point switching method and device |
| CN112040515B (en) | 2015-11-11 | 2022-04-08 | 华为技术有限公司 | Network switching method and device |
| CN110072264B (en) * | 2019-05-28 | 2021-02-02 | 重庆邮电大学 | Low-orbit satellite system switching method |
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