CN1231074C - Method of dynamic allocating radio channel resource for mobile station - Google Patents
Method of dynamic allocating radio channel resource for mobile station Download PDFInfo
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Abstract
The present invention discloses a method for dynamically allocating radio channel resources for a mobile station. The method belongs to a channel multiplexing technology method in a radio mobile data communication system. The radio business channel of a base station is divided into a time division channel and an invitation channel. The allocation situation of various channels is stored in a base station controller according to a channel list, a user list and a time slot assignment list. Before a certain kind of business is implemented to the mobile station, a request is required to be sent to the base station. Dynamic assignment is implemented to various channels by the base station controller according to the lists. After radio channel resources are obtained by the mobile station, corresponding business is implemented. The radio channel resources occupied by the mobile station are required to be released for completing the business by the mobile station to supply other mobile stations to use. The two channel multiplexing modes of a time division multiplexing mode and an invitation type multiplexing mode are comprehensively used. Thus, the requirement of the compatibility of the low speed timing business and the high speed mobile data transmission business of the mobile station is met, and the utilization rate of the channel and the capacity of the system can be effectively enhanced.
Description
Technical field
The present invention is a kind of to be the method for travelling carriage dynamic assignment radio channel resource, belongs to channel multiplexing technical method in the radio data communication system.
Background technology
In radio data communication system, the nucleus equipment of a base station is base station controller and wireless channel machine.Channel device is the passage that is used for carrying out wireless data transmission to travelling carriage, is that base station controller can be to the radio channel resource of travelling carriage distribution.Yet the quantity of the channel device of base station is limited, in order to improve the utilance of channel device, must use the channel multiplexing technology to improve the capacity of individual channel machine, thereby obtain the raising of overall system capacity.
Common channel multiplexing technology has frequency division multiplexing, time division multiplexing and code division multiplexing at present, frequency division multiplexing is that the total frequency range with communication system is divided into several equally spaced channels (channel), each mobile subscriber uses a channel, and the channel utilization of this mode is minimum.
Code division multiplexing uses spread spectrum, in signal extension to the very wide band limits with the mobile subscriber, a plurality of mobile subscriber's sharing wireless channel, distinguish different subscriber signals with different coded sequences, the channel utilization of this mode is the highest, but it is technical sophistication, with high costs not only, and for the limited dedicated mobile communications subsystem of utilized bandwidth, may realize code division multiplexing hardly in very little band limits.
Time division multiplexing is that the time that receives or send is divided into periodic time frame, each time frame is divided into several timeslices (timeslice is exactly a time slot) again, according to certain distribution principle, make each travelling carriage in each time frame, can only in the time slot of appointment, send data then to the base station.Under regularly satisfied and synchronous condition, the base station can receive the data of each travelling carriage respectively and the data of each travelling carriage can not obscured in each time slot.The channel utilization of this mode is than higher, but its traffic rate is lower, for the communication system of using finite bandwidth, low rate, is reasonable selection.
For mobile radio data communication system with following characteristics:
1. the channel device of base station is a full duplex, and travelling carriage is semiduplex;
2. travelling carriage is when carrying out scheduled service, sends data to the base station periodically according to certain time interval, and the flow direction of data is unidirectional substantially, less demanding to traffic rate;
3. travelling carriage is when carrying out the mobile data transport service, and the flow direction of data is two-way because travelling carriage is semiduplex, so its must ceaselessly between receiving and sending out, switch, to the requirement of traffic rate than higher.
Use aforesaid any channel multiplexing technology simply, can not satisfy of the requirement of above-mentioned mobile radio data communication system channel multiplexing.
Summary of the invention
The objective of the invention is to propose a kind of method of travelling carriage dynamic assignment radio channel resource that is, to satisfy of the requirement of above-mentioned mobile radio data communication system to channel multiplexing.
The objective of the invention is to be realized by following scheme: a kind ofly be the method for travelling carriage dynamic assignment radio channel resource, its hardware device comprises: the base station with a base station controller and at least three full duplex radio channel devices; The adjustable half-duplex radio mobile station of channel that a plurality of and described base station working method is corresponding.At least one signaling channel of described base stations control and some Traffic Channels.Described travelling carriage receives the control command of base station or sends request to the base station at signaling channel, receives the base station in Traffic Channel and transmits data or send data to the base station.It is that the user is the invitation channel of two-way transfer of data between user and base station at travelling carriage periodically to the time-derived channel of base station transmission data or by inviting multiplex mode by travelling carriage that described Traffic Channel will dynamically be assigned as by the time-division multiplex mode.A channel list that comprises the channel number and the channel type of all channels that is used for preserving the channel allocation situation is set in described base station controller, the user list of current all users' of record of corresponding each channel user number, and corresponding each time-derived channel is provided with minute book channel time slot allocation table of time slot allocation situation in frame period when whole, and corresponding each user also has the unit of the timeslot number of the unit of periodic quantity in recording timing cycle and initial time slot in the user list of each time-derived channel.
When the base station when signaling channel is received the timed sending request of travelling carriage, carry out the following step:
A. look into channel list, find out an available time-derived channel; If found, change step C.
B. if channel list is looked through, do not find available time-derived channel yet, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step.
C. look into the time slot allocation table of this channel, seek and determine to want distributed time slot by timed sending request predetermined timing cycle of described travelling carriage; If unsuccessful, return steps A.
D. with the user list of this channel of timeslot number typing of this user's user number, periodic quantity and initial time slot, will determine in the time slot allocation table of this channel want distributed time slot set for taking.
E. the base station sends channel number and the timeslot number that distributes by signaling channel to this travelling carriage, controls the time-derived channel initial time slot in accordance with regulations and the timing cycle transmission data of agreement that this travelling carriage forwards distribution to.
When the base station time-derived channel receive travelling carriage cancel the timed sending request time, carry out the following step:
F. the base station sends instruction at this time-derived channel to this travelling carriage, controls this travelling carriage and forwards signaling channel to.
G. be reset to the time slot that this user in the time slot allocation table of this channel has taken vacant by periodic quantity in this user's the user list and timeslot number.
H. from the user list of this channel, delete this user's user number, periodic quantity and timeslot number.
When the base station when signaling channel is received the mobile data transport service request of travelling carriage, carry out the following step:
I. look into channel list, find out an available invitation channel.If found, then change step L.
If J. do not find, then look into the user list of each time-derived channel, find out the time-derived channel of a no user, change the type of this channel in the channel list into the invitation channel, change step L.
K. if can not find the available invitation channel and the time-derived channel of no user, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step.
Whether the number of L. checking user in the user list of the invitation channel just found reaches the full quota, and is then to return step I; Deny, then this user's of typing user number in this user list.
M. the base station sends the channel number of this invitation channel at signaling channel to this travelling carriage, controls this travelling carriage and forwards this invitation channel to.
N. invite channel that the travelling carriage in the tabulation of this channel user is sent out in turn at this and invite, the travelling carriage that allows to be invited sends mobile data to the base station; Uninvited travelling carriage can only receive the mobile data that the base station sends.
When the base station invite channel receive travelling carriage cancel the request of mobile data transport service the time, carry out the following step:
O. the base station invites channel to send instruction to this travelling carriage at this, and the control travelling carriage forwards signaling channel to.
P. from the user list of this channel, delete this user's user number.
Q. if do not had user number in the user list of this channel, then the type with this channel in the channel list changes time-derived channel into.
Mode for the user distributes time-derived channel can be: travelling carriage can send data by more than one timing cycles, and the periodic quantity of the various timing cycles of travelling carriage is that second number is 2 positive integer time power.The time be maximum in the periodic quantity of various timing cycles in the frame period.The value of the number of time slots that per second is divided in the frame period in the time of is: when satisfying inequality
Maximum time+guard time+travelling carriage transmitting-receiving switching time≤1/2 that timed sending one secondary data is used
nThe time, get 2 of max-int in positive integer n
nValue.
The time slot allocation table that described step C. looks into this channel is sought by the timed sending request predetermined timing cycle of described travelling carriage and is determined to want distributed time slot, is as follows:
Each timing cycle is provided with a number of elements initial second array corresponding with the periodic quantity in this cycle, and the value of each element is the second number of searching initial time slot in the time of one in the frame period in described initial second array.
The initial value of the current array index of each initial second array is 0.
When the base station receives that a timing cycle is the timed sending request of X second, below the execution step by step:
C1. in the initial second array of correspondence, read number T second of the initial time slot in the element of current array index.
C2. the 1st time slot of T second begins to search idle time slot from the time slot allocation table of this channel.
C3. find the time slot of a free time, reexamine from the time slot in this space begin every X after second corresponding time slot whether all be idle, if, then these time slots are defined as distributing, change C6 step by step.
C4. if not, whether then look into current time slots is last time slot of this second, if not, then continue to search idle time slot second, and return C3 step by step from T.
C5. current time slots is last time slot of this second, then returns steps A.
C6. if the current array index of this initial second array is (X-1), then this current array index is changed to 0; , then this current array index is not added 1.
A kind of concrete way is in the aforementioned manner: the various timing cycles of described travelling carriage have 5 kinds, and their periodic quantity is respectively 1,2,4,8,16; The time frame period be 16 seconds.The number of time slots that per second is divided in the frame period in the time of one is 32.Array had 5 in initial second.Timing cycle is that the value of element is 0 in 1 the initial second array.Timing cycle is that the value of each element is followed successively by 0,1 in 2 the initial second array.Timing cycle is that the value of each element is followed successively by 0,2,1,3 in 4 the initial second array.Timing cycle is that the value of each element is followed successively by 0,4,2,6,1,5,3,7 in 8 the initial second array.Timing cycle is that the value of each element is followed successively by 0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15 in 16 the initial second array.
The present invention is a kind of to be the method for travelling carriage dynamic assignment radio channel resource, and it is divided into the radio traffic channel of base station time-derived channel and invites channel, the distribution condition that base station controller is preserved each channel with channel list, user list and time slot allocation table.Travelling carriage will send request to the base station before carrying out a kind of business, base station controller carries out dynamic assignment and with the distribution condition typing wherein according to above table to each channel.Travelling carriage has obtained after the suitable radio channel resource, just can carry out corresponding business; After mobile station service is finished, discharge its shared radio channel resource, for other travelling carriage use.Base station controller with the change conditions typing of this channel in the above table wherein.It has not only satisfied the requirement of travelling carriage low speed scheduled service and high-speed mobile data transmission service compatibility, can also realize the channel multiplexing on the maximum degree, improves the capacity of channel device.When travelling carriage will carry out timing data communication, employing uses corresponding initial second array to search the mode that can distribute time slot to the transmission request in different timing cycle, the time slot allocation table timing cycle in accordance with regulations of looking into this channel is sought assignable time slot and is distributed, thereby the base station can be arranged each travelling carriage transmission data to receive the data of different mobile stations in the time of one more equably in different time-gap and the data of each travelling carriage can not obscured in the frame period, improved the utilance of channel.When travelling carriage will carry out bidirectional data communication, adopt and invite multiplex mode, send invitation signal by the base station one by one to each travelling carriage, only receive that the travelling carriage of invitation just can send data, send after the data, the base station is invited next travelling carriage again.Solve the contradiction of half-duplex travelling carriage and full duplex base station radio transmitting-receiving ability, improved the utilance of channel.
Embodiment
The present invention is a kind of to be an embodiment of the method for travelling carriage dynamic assignment radio channel resource, the mobile radio data communication system of be used to have global location (hereinafter to be referred as GPS) alarm monitoring function and mobile data communication function.There are a base station controller and at least three full duplex radio channel devices in each base station in this system; Below for convenience of explanation, there are five full duplex radio channel devices to describe by a base station.In a base station the adjustable half-duplex radio mobile station of the corresponding channel of a plurality of and described base station working method is arranged in this system.It is signaling channel that a channel device is arranged in the base station, and other four is Traffic Channel.Travelling carriage receives the control command of base station or sends request to the base station at signaling channel, receives the data of base station transmission or sends data to the base station in Traffic Channel.
To be the user carrying out when global location alarm monitoring business (hereinafter to be referred as the GPS business) is the said scheduled service in front travelling carriage, be to send the GPS locator data to the base station periodically according to certain time interval, the flow direction of data is unidirectional substantially, less demanding to traffic rate.
Travelling carriage be the user when carrying out mobile data transport service (hereinafter to be referred as the MPC business), the flow direction of data is two-way because travelling carriage is semiduplex, so its must ceaselessly between receiving and sending out, switch, to the requirement of traffic rate than higher.
At the characteristics of this system, adopt the method for dynamic assignment radio channel resource of the present invention: carry out using time-multiplexed channel allocation mode when GPS is professional at travelling carriage, when travelling carriage carries out the MPC business, use the multiplexing channel allocation mode of inviting.Aforementioned four Traffic Channels will dynamically be assigned as by the time-division multiplex mode and periodically send the time-derived channel of gps data or by the invitation channel of inviting multiplex mode two-way transmission mobile data between travelling carriage and base station to the base station by travelling carriage.
By the time-division multiplex mode, travelling carriage can send gps data by more than one timing cycles.The periodic quantity of the various timing cycles of travelling carriage is that second number is 2 positive integer time power; The time be maximum in the periodic quantity of various timing cycles in the frame period; The value of the number of time slots that per second is divided in the frame period in the time of is: when satisfying inequality
Maximum time+guard time+travelling carriage transmitting-receiving switching time≤1/2 that timed sending one secondary data is used
nThe time, get 2 of max-int in positive integer n
nValue.
So-called time-multiplexed channel allocation mode, when finger carries out the GPS business in this mobile radio data communication system, GPS monitoring period according to maximum is the correlated performance (message transmission rate) of foregoing timing cycle (16 seconds) and radio receiving transmitting module, frame period when allowing each channel device be with 16 seconds, per second is divided into 32 time slots, so can divide 32 * 16=512 time slot in the frame period in the time of one.
The division of monitoring period, have 1 second, 2 seconds, 4 seconds, 8 seconds, 16 seconds these several monitoring periods, if the monitoring period of each travelling carriage all is 1 second, then a channel device can allow 32 travelling carriages carry out the GPS monitoring business simultaneously, if the monitoring period of each travelling carriage all is 16 seconds, then a channel device can allow 512 travelling carriages carry out the GPS monitoring business simultaneously, has improved the capacity of the utilance and the system of channel greatly.Be in operation, the monitoring period of each travelling carriage can be different, dynamically changes between 32 to 512 so a channel device of base station can carry out the quantity of the travelling carriage of GPS monitoring business at most simultaneously.
So-called invitation is multiplexing to be exactly that the invitation that can send data is one by one sent to the travelling carriage that carries out the MPC business in the base station, receives that the travelling carriage of invitation just can send data to the BTS channel machine.When the base station sent data, the base station can also send data to other travelling carriage at a travelling carriage.After a travelling carriage transmission finished, it changed the reception data mode over to, and the base station is invited next travelling carriage to carry out data again and sent.
In the system, be provided with a channel list that comprises the channel number and the channel type of all five channels of the distribution condition that is used for preserving channel in the software of base station controller; The user list of current all users' of record of corresponding each channel user number, corresponding each time-derived channel be provided with a minute book channel when whole in the frame period in the user list of the time slot allocation table of time slot allocation situation and each time-derived channel corresponding each user also have the unit of the timeslot number of the unit of periodic quantity in recording timing cycle and initial time slot.
Channel number is that base station controller is a numbering of this channel appointment, and as 0,1,2,3,4, base station controller is distinguished different channels with channel number.
Channel type comprises signaling channel, time-derived channel, invitation channel.The data that send on the signaling channel are broadcasted, and mainly are various control commands and make travelling carriage and channel device keep synchronous synchrodata.In this example, time-derived channel is meant that this channel is assigned to carry out the GPS business.Invite channel to be meant that this channel is used to carry out the MPC business.A Traffic Channel can be designated as different channel types in different, under the situation without any business, all idle business channels all are defaulted as time-derived channel.
The time slot allocation table is when a channel is used as time-derived channel, is used for which time slot is idle in time frame of mark, and which time slot is used.It is the important evidence of distributing time slot for the travelling carriage that carries out the GPS business.
User number is the identiflication number of each travelling carriage.
Travelling carriage all is to be in the state that receives the signaling channel broadcast data free time.The base station timed sending is used to keep travelling carriage and the synchronous synchronization frame of base station clock, so that the data that travelling carriage sends in each time slot can both correctly be received.
Travelling carriage can send GPS monitoring request on one's own initiative and promptly send timed sending request at signaling channel to the base station by travelling carriage; Also can receive the GPS monitor command passively, promptly send the timed sending instruction to the base station by higher level control centre.No matter be initiatively or passive, channel and time slot that base station controller all will share out the work for it.When a base station controller is received monitoring request or order, it is at first in its channel list, the channel that to find out a type be time-derived channel, use time-multiplexed channel multiplexing mode then, the working time slot that in the time slot allocation table of this channel, distributes travelling carriage according to the monitoring period of regulation in monitoring request or the order, after the success, just the channel number and the start timeslot number that distribute are issued travelling carriage, travelling carriage then begins to send gps data in channel appointed and initial time slot, and every gps data of a monitoring period transmission, before its winding-up discharged channel time slot, other travelling carriage can not re-use these time slots.
When the time slot allocation of a channel finishes, when can not reallocate, just begin to distribute from next time-derived channel to other travelling carriage.Being allocated successfully the back just is added to user number, monitoring period and the start timeslot number of this travelling carriage correspondence in the user list.
When travelling carriage finished the GPS business, base station controller discharged the channel time slot of its use, upgraded the time slot allocation table, and the record of this user in the deletion user list is so that other travelling carriage can use these time slots.
That is to say, when the base station receives that at signaling channel the timed sending request of travelling carriage is GPS when request monitoring, carries out the following step:
A. look into channel list, find out an available time-derived channel; If found, change step C;
B. if channel list is looked through, do not find available time-derived channel yet, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step;
C. look into the time slot allocation table of this channel, seek and determine to want distributed time slot by timed sending request predetermined timing cycle of described travelling carriage; If unsuccessful, return steps A;
D. with the user list of this channel of timeslot number typing of this user's user number, periodic quantity and initial time slot, will determine in the time slot allocation table of this channel want distributed time slot set for taking;
E. the base station sends channel number and the timeslot number that distributes by signaling channel to this travelling carriage, controls the time-derived channel initial time slot in accordance with regulations and the timing cycle transmission data of agreement that this travelling carriage forwards distribution to;
When the base station receives that at time-derived channel the timed sending request of cancelling of travelling carriage promptly finishes GPS when professional, carries out the following step:
F. the base station sends instruction at this time-derived channel to this travelling carriage, controls this travelling carriage and forwards signaling channel to;
G. be reset to the time slot that this user in the time slot allocation table of this channel has taken vacant by periodic quantity in this user's the user list and timeslot number;
H. from the user list of this channel, delete this user's user number, periodic quantity and timeslot number;
For being the GPS monitored instruction and cancelling the timed sending instruction and promptly cancel the situation of GPS monitored instruction to base station transmission timed sending instruction by higher level control centre, to above-mentioned to send the timed sending request be GPS monitoring request that promptly to cancel the situation of GPS monitoring request similar with cancelling the timed sending request by travelling carriage, only difference is made an explanation here.Receive higher level control centre after the base station sends the timed sending instruction when the base station, when the situation of step B occurring, the base station sends replying of failure to higher level control centre; And abandon subsequent step.Step C. looks into the time slot allocation table of this channel, seeks and determines to want distributed time slot by the described timed sending instruction predetermined timing cycle; If unsuccessful, return steps A.Step e. the base station sends channel number and timeslot number and the timing cycle that distributes by signaling channel to this travelling carriage, controls the time-derived channel initial time slot in accordance with regulations and the timing cycle transmission data of appointment that this travelling carriage forwards distribution to.When the base station receive higher level control centre to the base station send cancel the timed sending instruction after, the step that carry out the base station is cancelled the timed sending request promptly to cancel the situation that the GPS monitoring asks identical with being sent by travelling carriage.
Above-mentioned processing procedure both had been applicable to that each travelling carriage only allowed to use a kind of situation of timing cycle, was applicable to that also each travelling carriage allows to use the situation of multiple timing cycle.But the situation for the multiple timing cycle of each travelling carriage permission use also needs to do the processing of further refinement.
The GPS monitoring period of the travelling carriage that will monitor in this example has multiple, the base station is distributed in initial time slot in the channel according to the GPS monitoring period of the travelling carriage that will monitor for it, travelling carriage then begins to send gps data from the initial time slot of this channel appointed, and sends gps data again one time every a monitoring period.According to effectively utilizing time slot, reduce the principle disturbed as far as possible, used following distribution time slot method:
It for monitoring period 1 second monitoring request, only in the 0th second an of time frame, distribute initial time slot for it, search since 0 second the 1st time slot, when finding first idle time slot, reexamine whether those time slots after a second that begin from this idle time slot in this time frame are idle all, if, just just giving travelling carriage this initial time slot allocation, and these time slots of whenever being separated by a second are labeled as use, if not, then search next idle time slot, repeat above-mentioned operation.If in 32 time slots of one second, can not find the time slot that satisfies condition, just begin to distribute from next channel.Before travelling carriage finished communication release channel time slot, other travelling carriage can not re-use these time slots.
It for monitoring period 2 seconds monitoring request, elder generation for it distributes time slot, for the request of the same monitoring period of the next one, then distributed in the 1st second in the 0th second an of time frame, next again request distributed in the 0th second again, according to 0,1,0,1 ... sequential loop distribute.The 0th time slot in one second finds out first idle time slot, then according to aforesaid inspection method, whether inspection all is idle every those time slots of 2 seconds, if, just give travelling carriage this initial time slot allocation, these time slots are labeled as use, if not, then search next idle time slot, repeat same inspection, till finding the time slot that satisfies condition.If in 32 time slots of one second, can not find the time slot that satisfies condition, just begin to distribute from next channel.
It for monitoring period 4 seconds monitoring request, first request distributed time slot for it in the 0th second, second request distributed in the 2nd second, the 3rd request distributed in the 1st second, the 4th request distributed in the 3rd second, the 5th request was its distribution in the 0th second again, according to 0,2,1,3,0,2,1,3 ... sequential loop distribute.
By that analogy, be 8 seconds monitoring request for monitoring period, according to 0,4,2,6,1,5,3,7,0,4,2,6,1,5,3,7 ... sequential loop distribute.
For monitoring period is 16 seconds monitoring request, according to 0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15,0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15 ... sequential loop distribute.
Above-mentioned lookup method, purpose are as much as possible with in the working time slot uniform distribution of each travelling carriage each time slot in different seconds of frame period one time, and the signal that reduces between the travelling carriage disturbs.Certainly, multiple choices can be arranged to the number of various timing cycles, periodic quantity, initial second distribution, be not this example specifically exemplify this is a kind of, all can follow this method and realize.
Realize above-mentioned lookup method, the time slot allocation table that step C. noted earlier is looked into this channel is sought assignable time slot by the timed sending request predetermined timing cycle of described travelling carriage exactly, handles as follows:
Each timing cycle is provided with a number of elements initial second array corresponding with the periodic quantity in this cycle, and the value of each element is the second number of searching initial time slot in the time of one in the frame period in described initial second array;
The initial value of the current array index of each initial second array is 0;
When the base station receives that a timing cycle is the timed sending request of X second, below the execution step by step:
C1. in the initial second array of correspondence, read number T second of the initial time slot in the element of current array index;
C2. the 1st time slot of T second begins to search idle time slot from the time slot allocation table of this channel;
C3. find the time slot of a free time, reexamine from the time slot in this space begin every X after second corresponding time slot whether all be idle, if, then these time slots are defined as distributing, change C6 step by step;
C4. if not, whether then look into current time slots is last time slot of this second, if not, then continue to search idle time slot second, and return C3 step by step from T;
C5. current time slots is last time slot of this second, then returns steps A;
C6. if the current array index of this initial second array is (X-1), then this current array index is changed to 0; , then this current array index is not added 1.
Here, the various timing cycles of travelling carriage have 5 kinds, and their periodic quantity is respectively 1,2,4,8,16.The time frame period be 16 seconds.The number of time slots that per second is divided in the frame period in the time of one is 32.Array had 5 in initial second; Timing cycle is that the value of element is 0 in 1 the initial second array; Timing cycle is that the value of each element is followed successively by 0,1 in 2 the initial second array; Timing cycle is that the value of each element is followed successively by 0,2,1,3 in 4 the initial second array; Timing cycle is that the value of each element is followed successively by 0,4,2,6,1,5,3,7 in 8 the initial second array; Timing cycle is that the value of each element is followed successively by 0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15 in 16 the initial second array.
In the present embodiment, supposing has three vehicle-mounted travelling carriages will carry out the GPS monitoring business at a certain time-derived channel, and the cycle that sends gps data was respectively 1 second, 2 seconds, 2 seconds.Receive the monitoring request of first car when the base station after, in the 0th second of time slot allocation table, find idle time slot, check that then these time slots after a second are the free time entirely, if, just give this car this initial time slot allocation, and this time slot and the time slot after 1 second be labeled as use.
Receive the monitoring request of second car when the base station after, in the 0th second of time slot allocation table, find idle time slot, check then whether these time slots after 2 seconds are the free time entirely, if, just give this car this initial time slot allocation, and this time slot and the time slot after 2 seconds be labeled as use.
Receive the monitoring request of the 3rd car when the base station after, in the 1st second of time slot allocation table, search idle time slot, check then whether these time slots after 2 seconds are the free time entirely, if, just give this car this initial time slot allocation, and this time slot and the time slot after 2 seconds be labeled as use.
When travelling carriage will carry out the MPC business, in order to improve the speed of transfer of data, a travelling carriage will be monopolized channel resource in transceive data.Consider that the BTS channel machine is a full duplex, and travelling carriage is semiduplex, that is to say, the receipts of travelling carriage and send out hocket, according to these characteristics, our design allows a travelling carriage when sending out data, and other travelling carriage is being received data, so just can realize that the shared channel of a plurality of travelling carriages carries out the MPC business, improves the utilance of channel device.According to this design, the present invention proposes the invitation multiplex technique.
At first, the travelling carriage that need carry out the MPC business proposes the MPC service request to base station controller in signaling channel, after base station controller is received this request, finds out one and invite channel in channel list.If can not find, then look for the time-derived channel (in the user list of this channel without any the user) of a free time, the channel type of this channel is appointed as the invitation channel.User number with this travelling carriage is added in the user list again, at last this channel number is issued travelling carriage, and travelling carriage just can carry out the MPC business on this channel.When carrying out the MPC business, travelling carriage only just can send data after having received the transmission invitation command, all is in the reception data mode in other time.When travelling carriage finishes the MPC business, base station controller will discharge the channel of its use, and the user of this travelling carriage correspondence is deleted in user list, if at this moment do not have other user at this channel of use, just it will be appointed as time-derived channel.For preventing on an invitation channel, to get into too much travelling carriage, influence transmitting-receiving speed, stipulate in this example that each invites the limit of user's number on channel is 8 users.
That is to say, when the base station when signaling channel is received the mobile data transport service request of travelling carriage, carry out the following step:
When the base station when signaling channel is received the mobile data transport service request of travelling carriage, carry out the following step:
I. look into channel list, find out an available invitation channel; If found, then change step L.
If J. do not find, then look into the user list of each time-derived channel, find out the time-derived channel of a no user, change the type of this channel in the channel list into the invitation channel, change step L.
K. if can not find the available invitation channel and the time-derived channel of no user, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step.
Whether the number of L. checking user in the user list of the invitation channel just found reaches the full quota; Be then to return I; Deny, then this user's of typing user number in this user list.
M. the base station sends the channel number of this invitation channel at signaling channel to this travelling carriage, controls this travelling carriage and forwards this invitation channel to.
N. invite channel that the travelling carriage in the tabulation of this channel user is sent out in turn at this and invite, the travelling carriage that allows to be invited sends mobile data to the base station; Uninvited travelling carriage can only receive the mobile data that the base station sends.
When the base station invite channel receive travelling carriage cancel the request of mobile data transport service the time, carry out the following step:
O. the base station invites channel to send instruction to this travelling carriage at this, and the control travelling carriage forwards signaling channel to.
P. from the user list of this channel, delete this user's user number.
Q. if do not had user number in the user list of this channel, then the type with this channel in the channel list changes time-derived channel into.
In the present embodiment, in some BTS channel machines, there are three travelling carriages to carry out data transmission service at the same time sometime.Travelling carriage all is in accepting state when receiving that not transmission is invited.Channel device at first sends invitation to travelling carriage A, if travelling carriage A has data to send out, then sends data to channel device, and in this time, channel device is the data of receiving mobile A on one side, to travelling carriage B or C send data on one side.After the data of travelling carriage A sent, channel device sent invitation to travelling carriage B again, and after B sends invitation, channel device still can send data to A or C.Suppose that at this moment B does not have data to send, channel device wait for time that travelling carriage B replys overtime after, will send invitation to travelling carriage C, travelling carriage C just can send out data, the while channel device can be sent out data to A or B.C sends after the data, and channel device sends invitation to A again, and so circulation has realized sharing of channel.
The present invention is a kind of to be the method for travelling carriage dynamic assignment radio channel resource, can also be used for real-time monitoring and the statistics of environmental protection department to a plurality of environment monitorings zone or monitoring point; Earthquake, the hydrology, geology, meteorological departments are to the real-time monitoring and the statistics of the scientific research stationary monitoring point of the dispersion of provisional setting, and the mobile data of wide spectrums such as economy and trade or education is managed business.Here do not exemplify the concrete condition of its enforcement one by one.
Claims (3)
1. one kind is the method for travelling carriage dynamic assignment radio channel resource, and its hardware device comprises: the base station with a base station controller and at least three full duplex radio channel devices; The adjustable half-duplex radio mobile station of channel that a plurality of and described base station working method is corresponding; Described base stations control at least one and some Traffic Channels; Described travelling carriage receives the control command of base station or sends request to the base station at signaling channel, receives the base station in Traffic Channel and transmits data or send data to the base station; It is characterized in that: it is that the user is the invitation channel of two-way transfer of data between user and base station at travelling carriage periodically to the time-derived channel of base station transmission data or by inviting multiplex mode by travelling carriage that described Traffic Channel will dynamically be assigned as by the time-division multiplex mode; A channel list that comprises the channel number and the channel type of all channels that is used for preserving the channel allocation situation is set in described base station controller, the user list of current all users' of record of corresponding each channel user number, and corresponding each time-derived channel is provided with minute book channel time slot allocation table of time slot allocation situation in frame period when whole, and corresponding each user also has the unit of the timeslot number of the unit of periodic quantity in recording timing cycle and initial time slot in the user list of each time-derived channel;
When the base station when signaling channel is received the timed sending request of travelling carriage, carry out the following step:
A. look into channel list, find out an available time-derived channel; If found, change step C;
B. if channel list is looked through, do not find available time-derived channel yet, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step;
C. look into the time slot allocation table of this channel, seek and determine to want distributed time slot by timed sending request predetermined timing cycle of described travelling carriage; If unsuccessful, return steps A;
D. with the user list of this channel of timeslot number typing of this user's user number, periodic quantity and initial time slot, will determine in the time slot allocation table of this channel want distributed time slot set for taking;
E. the base station sends channel number and the timeslot number that distributes by signaling channel to this travelling carriage, controls the time-derived channel initial time slot in accordance with regulations and the timing cycle transmission data of agreement that this travelling carriage forwards distribution to;
When the base station time-derived channel receive travelling carriage cancel the timed sending request time, carry out the following step:
F. the base station sends instruction at this time-derived channel to this travelling carriage, controls this travelling carriage and forwards signaling channel to;
G. be reset to the time slot that this user in the time slot allocation table of this channel has taken vacant by periodic quantity in this user's the user list and timeslot number;
H. from the user list of this channel, delete this user's user number, periodic quantity and timeslot number; When the base station when signaling channel is received the mobile data transport service request of travelling carriage, carry out the following step:
I. look into channel list, find out an available invitation channel; If found, then change step L;
If J. do not find, then look into the user list of each time-derived channel, find out the time-derived channel of a no user, change the type of this channel in the channel list into the invitation channel, change step L;
K. if can not find the available invitation channel and the time-derived channel of no user, then the base station sends replying of failure by signaling channel to this travelling carriage, and abandons subsequent step;
Whether the number of L. checking user in the user list of the invitation channel just found reaches the full quota; Be then to return step I; Deny, then this user's of typing user number in this user list;
M. the base station sends the channel number of this invitation channel at signaling channel to this travelling carriage, controls this travelling carriage and forwards this invitation channel to;
N. invite channel that the travelling carriage in the tabulation of this channel user is sent out in turn at this and invite, the travelling carriage that allows to be invited sends mobile data to the base station; Uninvited travelling carriage can only receive the mobile data that the base station sends;
When the base station invite channel receive travelling carriage cancel the request of mobile data transport service the time, carry out the following step:
O. the base station invites channel to send instruction to this travelling carriage at this, and the control travelling carriage forwards signaling channel to;
P. from the user list of this channel, delete this user's user number;
Q. if do not had user number in the user list of this channel, then the type with this channel in the channel list changes time-derived channel into.
2. the method for dynamic assignment radio channel resource according to claim 1 is characterized in that: travelling carriage can send data by more than one timing cycles, and the periodic quantity of the various timing cycles of travelling carriage is that second number is 2 positive integer time power; The time be maximum in the periodic quantity of various timing cycles in the frame period; The value of the number of time slots that per second is divided in the frame period in the time of is: when satisfying inequality
Maximum time+guard time+travelling carriage transmitting-receiving switching time≤1/2 that timed sending one secondary data is used
nThe time, get 2 of max-int in positive integer n
nValue;
The time slot allocation table that described step C. looks into this channel is sought by the timed sending request predetermined timing cycle of described travelling carriage and is determined to want distributed time slot, is as follows:
Each timing cycle is provided with a number of elements initial second array corresponding with the periodic quantity in this cycle, and the value of each element is the second number of searching initial time slot in the time of one in the frame period in described initial second array;
The initial value of the current array index of each initial second array is 0;
When the base station receives that a timing cycle is the timed sending request of X second, below the execution step by step:
C1. in the initial second array of correspondence, read number T second of the initial time slot in the element of current array index;
C2. the 1st time slot of T second begins to search idle time slot from the time slot allocation table of this channel;
C3. find the time slot of a free time, reexamine from the time slot in this space begin every X after second corresponding time slot whether all be idle, if, then these time slots are defined as distributing, change C6 step by step;
C4. if not, whether then look into current time slots is last time slot of this second, if not, then continue to search idle time slot second, and return C3 step by step from T;
C5. current time slots is last time slot of this second, then returns steps A;
C6. if the current array index of this initial second array is (X-1), then this current array index is changed to 0; , then this current array index is not added 1.
3. the method for dynamic assignment radio channel resource according to claim 2 is characterized in that: the various timing cycles of described travelling carriage have 5 kinds, and their periodic quantity is respectively 1,2,4,8,16; The time frame period be 16 seconds; The number of time slots that per second is divided in the frame period in the time of one is 32; Array had 5 in initial second; Timing cycle is that the value of element is 0 in 1 the initial second array; Timing cycle is that the value of each element is followed successively by 0,1 in 2 the initial second array; Timing cycle is that the value of each element is followed successively by 0,2,1,3 in 4 the initial second array; Timing cycle is that the value of each element is followed successively by 0,4,2,6,1,5,3,7 in 8 the initial second array; Timing cycle is that the value of each element is followed successively by 0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15 in 16 the initial second array.
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| CN 01142882 CN1231074C (en) | 2001-12-29 | 2001-12-29 | Method of dynamic allocating radio channel resource for mobile station |
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| CN 01142882 CN1231074C (en) | 2001-12-29 | 2001-12-29 | Method of dynamic allocating radio channel resource for mobile station |
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| CN101340235B (en) * | 2007-07-05 | 2012-10-17 | 三星电子株式会社 | Apparatus and method for processing transmission information |
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| CN101500311B (en) * | 2008-01-31 | 2012-04-04 | 电信科学技术研究院 | Allocation method, system and apparatus for continuous scheduling resource |
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| CN102487303B (en) * | 2010-12-06 | 2015-08-26 | 中兴通讯股份有限公司 | Time slot distribution management method and device |
| CN104023338A (en) * | 2013-03-01 | 2014-09-03 | 北京海格神舟通信科技有限公司 | Radio resource management method with anti-interference function |
| CN106455073B (en) * | 2016-08-23 | 2021-04-13 | 国网冀北电力有限公司信息通信分公司 | Channel allocation method for security service in electric power wireless private network and central base station |
| CN109644502B (en) * | 2016-12-13 | 2020-09-25 | 华为技术有限公司 | Point-to-multipoint channel allocation method, device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340235B (en) * | 2007-07-05 | 2012-10-17 | 三星电子株式会社 | Apparatus and method for processing transmission information |
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