CN103037376B - The Adaptive Time Division Duplex system and method dynamically distributed with wireless communication system - Google Patents
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Abstract
The present invention provides a kind of Adaptive Time Division Duplex system and method dynamically distributed for wireless communication system, belong to wireless communication technology field, the present invention passes through initial setting up, monitoring in real time, update service communication bandwidth demand and up-link and the downlink requirement for bandwidth realizing adaptive communications channel is set, improve the efficiency of communication link, meet frequency spectrum resource in short supply under the conditions of, frequency spectrum resource repeats effectively to utilize.Bandwidth demand according to channel is up-link or downlink transmission distributes time slot flexibly and dynamically.Use predetermined bandwidth demand parameter to arrange, and monitor communication link bandwidth continuously.According to channel requirements configuration communication channel to have uplink/downlink bandwidth symmetrically or non-symmetrically.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to a kind of Adaptive Time Division Duplex system and method dynamically distributed for wireless communication system.
Background technology
The present invention relates to wireless communication system, time division duplex (TDD) or FDD (FDD) method is generally to use in existing wireless communications systems technology, in order to exchange information between base station and subscriber unit.Transmission from base station to subscriber unit is commonly called " downlink " and launches, and the transmission from subscriber unit to base station is commonly called " up-link " and launches.
At TDD duplex mode, the bandwidth of uplink and downlink adjusts according to the size of flow, accordingly even when be asymmetrical business, the utilization rate of bandwidth can also reach almost 100%.Uplink and downlink bandwidth in FDD mode is fixed, so when transmitting non-symmetrical service, the most a certain to bandwidth inadequate, and another to bandwidth waste.
In DECT DECT, channel is that both up-link and downlink transmission distribute equal time quantum (namely bandwidth), say that DECTTDD duplexing schemes is " symmetrical " from nature, on average, the reception of information and transmitting are needed the system (such as DECT system) of equal bandwidth amount to be enough by symmetrical duplex system.And symmetrical duplex system to complete efficiency in the communication system of asymmetrical information Exchange Service between base station and subscriber station low.As the most such in the broadband of speech, data and video traffic etc or the wireless communication system of " broadband " business.
In the cordless communication network of band width service, it is uncertain that up-link and downlink transmission have equal or symmetrical bandwidth.It practice, in the many situations being presently considered, bandwidth demand is likely to unequal or asymmetric.There is several factor drawing this observation.First, determine up-link and the ratio of downlink requirement for bandwidth and overall bandwidth demands to a certain extent through the business of link transmission；Second, owing to each channel is by many for transmission different services, the ratio of desired uplink/downlink bandwidth changes during broadcast service between the channels, and every kind of service has the distinctive bandwidth demand of their own for transmitting and reception, and the bandwidth demand of user is to change.
Accordingly, it would be desirable to the method and apparatus that up-link and downlink bandwidth can be distributed flexibly and dynamically in a kind of Time Division Duplexing scheme.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of Adaptive Time Division Duplex system and method dynamically distributed for wireless communication system, the present invention passes through initial setting up, monitoring in real time, update service communication bandwidth demand and up-link and the downlink requirement for bandwidth realizing adaptive communications channel is set, improve the efficiency of communication link, meet frequency spectrum resource in short supply under the conditions of, frequency spectrum resource effectively reuses.Bandwidth demand according to channel be up-link (Ta) or downlink (Tb, Tc, Td) transmission distribute time slot flexibly and dynamically.Use predetermined bandwidth demand parameter to arrange and monitor communication link bandwidth continuously.According to channel requirements configuration communication channel to have uplink/downlink bandwidth symmetrically or non-symmetrically.
It is an object of the invention to use following technical proposals to realize:
A kind of Adaptive Time Division Duplex system dynamically distributed for wireless communication system, it thes improvement is that, described system includes:
Bandwidth allocation manager system: for 1) renewal in business and demand band data storehouse；2) initial setting up of user's bandwidth requirements is completed；3) transmit traffic flag and up-to-date business and demand band data storehouse according to user and complete the renewal of bandwidth requirements；4) memory user's up-to-date demand bandwidth, as the reference value of initial setting up next time；
Subscriber unit: send transmission traffic flag for described bandwidth allocation manager system；
Frequency band parameters arranges unit: initial setting up and renewal band bandwidth parameter for band bandwidth are arranged.
The adaptive time division duplexing method of the Adaptive Time Division Duplex system that a kind of wireless communication system that the present invention provides based on another object dynamically distributes, it thes improvement is that, described method comprises the steps:
A, initial band bandwidth parameter is set；
B, real-time Observational frequency band bandwidth demand；
C, renewal band bandwidth demand are arranged；
D, complete self adaptation band bandwidth distribution.
Wherein, in described step A, set up the data base of wireless communication transmissions business and desire bandwidth, and wireless communication transmissions business and demand bandwidth are carried out the labelling of distinct symbols；Described database service is in bandwidth allocation manager system；Described bandwidth allocation manager system arranges initial band bandwidth parameter；
Described band bandwidth parameter includes transmitting service parameter and bandwidth demand parameter.
Wherein, described wireless communication transmissions business includes speech business, video traffic and power information capturing service.
Wherein, in described step B, the monitor value of described bandwidth allocation manager system real-time reception to subscriber unit each time point bandwidth demand；Described monitor value by subscriber unit transmit business time, transmission traffic flag is sent to bandwidth allocation manager system, bandwidth allocation manager system identification transmission traffic flag, is demodulated into transmission business demand bandwidth, transmission business demand bandwidth command is sent to parameter set unit.
Wherein, in described step C, bandwidth parameter arrange unit receive real-time bandwidth demand time, update band bandwidth demand arrange；In updating band bandwidth demand setting up procedure, cell business volume in wireless communication system is monitored in real time；The object of monitoring is cell transmission traffic flag；The result of monitoring available frequency needed for calculating community is counted.
Wherein, described renewal band bandwidth demand arranges and comprises the steps:
I, summarizing cell service kind and quantity；
II, Zone kind and quantity according to statistics carry out frequency number needed for community and calculate；
III, according to calculate community needed for frequency number distribution frequency
Wherein, described available frequency includes idle frequency and has used frequency；Described available frequency refers to all frequencies after being divided in country's nothing delegates the frequency range of power；Described idle frequency refers to be not allocated in frequency pool the frequency of user.
Wherein, in described step D, transmission business triggering frequency and dynamically distribute, bandwidth allocation manager system completes the distribution of self adaptation band bandwidth according to step A-C.
Compared with the prior art, the present invention reaches to provide the benefit that:
(1) business and the demand band data storehouse of this community are established；
(2) first user uploads traffic flag, and bandwidth allocation manager system uses the method for labelling to complete the identification of customer service；
(3) bandwidth allocation manager system receives user and transmits traffic flag, and business of calling updates frequency band parameters with demand band data storehouse and arranges unit；
(4) being arranged by the parameter of renewal frequency bandwidth, the self adaptation completing frequency band is dynamically distributed.
(5) needed by the bandwidth of response communication link change, be up-link and downlink distribution requirements bandwidth neatly, be so easy to effectively utilize the communication channel in wireless communication system.According to the present invention, make setting bandwidth demand initial parameter arrange and monitor communication link bandwidth demand continuously.The present invention responds the bandwidth demand of communication link change, is up-link or downlink transmission distribution time slot flexibly and dynamically distributively.
Accompanying drawing explanation
Fig. 1 is the database diagram of the transmission business that provides of the present invention and bandwidth；
Fig. 2 is the real-time bandwidth demand monitoring flow chart that the present invention provides；
Fig. 3 is first " based on frame " conceptual scheme realizing Bandwidth Dynamic Allocation that the present invention provides；
Fig. 4 is second " based on frame " conceptual scheme realizing Bandwidth Dynamic Allocation that the present invention provides；
Fig. 5 is the Organization Chart dynamically distributing frequency that the present invention provides；
Fig. 6 is the flow chart of the adaptive time division duplexing method dynamically distributed with wireless communication system that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
The present invention provides a kind of Adaptive Time Division Duplex system dynamically distributed for wireless communication system, including:
Bandwidth allocation manager system: for 1) renewal in business and demand band data storehouse；2) complete at the beginning of user's bandwidth requirements
Begin to arrange；3) transmit traffic flag and up-to-date business and demand band data storehouse according to user and complete the renewal of bandwidth requirements；
4) memory user's up-to-date demand bandwidth, as the reference value of initial setting up next time；
Subscriber unit: send transmission traffic flag for described bandwidth allocation manager system；
Present invention also offers a kind of adaptive time division duplexing method dynamically distributed for wireless communication system as shown in Figure 6, comprise the steps:
A, initial band bandwidth parameter is set；
The transmission business of present invention offer is with the database diagram of bandwidth as shown in Figure 1, different based on the required bandwidth of radio communication different business, relation according to wireless communication system business Yu desire bandwidth, set up the data base of a transmission business and desire bandwidth, radio communication miscellaneous service and demand bandwidth are carried out the mark of distinct symbols: as video traffic VT1 represents, video traffic demand bandwidth BT1 represents, speech business, the symbol the most corresponding thereto such as power information capturing service represents, and speech business transmission demand bandwidth, power information capturing service demand bandwidth forms database D atabase1 of a business and demand bandwidth.Database1 serves bandwidth allocation manager system.Bandwidth allocation manager system needs to arrange the parameters such as initial parameter includes transmitting business setting, bandwidth demand is arranged in initial conditions and arranges.
B, real-time Observational frequency band bandwidth demand: bandwidth allocation manager system real-time reception is to subscriber unit monitor value of point bandwidth demand between current: this monitor value by subscriber unit when the business of transmission, business transmission mark is sent to bandwidth allocation manager system, system identification mark, it is demodulated into business demand bandwidth, sends commands to parameter set unit.
C, renewal band bandwidth demand are arranged；
Bandwidth parameter arrange unit receive real-time bandwidth demand time, update rapidly bandwidth parameter and arrange, bandwidth is updated to present stage demand bandwidth, parameter updates the time and wants to be negligible the transmission time.During bandwidth parameter updates, need constantly cell business volume in wireless communication system to be monitored in real time, the object of monitoring is mainly the transmission traffic flag of community, its result is used for calculating the frequency number needed for this community, owing to cell transmission business is in the state being continually changing, in order to the resource of Shi Gei community distribution be enough to support that the business of subsequent time period is transmitted, this undated parameter process is it is also contemplated that comprise the estimation to subsequent time period class of business and prediction at one.
Present invention employs the time slot allocative decision of " based on frame ", be dynamically up-link or downlink transmission period distribution time slot.The program allows system to be only the frame slot of downlink (on the other hand, up-link) transmission dynamically distribution the first quantity, is that up-link (on the other hand, downlink) transmission constitutes residue frame time slot simultaneously.Another kind of scheme based on frame also allows for being only downlink (on the other hand, up-link) transmission by system and dynamically distributes the frame slot of the first quantity, then, can according to channel width need by body in frame slot distribute to up-link or downlink transmission.As Figure 3-Figure 4, by a frame definition for including N number of continuous print time slot (wherein N remains constant).In the scheme of first " based on frame " shown in Fig. 3, communication system is only N1 time slot (wherein N is more than or equal to N1) of downlink transmission dynamic construction the oneth.It is only remaining N2 the time slot of ul transmissions dynamic construction (wherein N2 is equal to N-N1).
Fig. 4 is shown in communication channel second scheme based on frame distributing time slot.In addition to being no longer only N2 the time slot that ul transmissions constitutes fertility, it is somebody's turn to do allocative decision based on frame same as shown in Figure 3, specifically, as shown in Figure 4, contrary with the scheme based on frame of Fig. 3, N2 (N2 is equal to N-N1) time slot of fertility is not only constituted for ul transmissions.And it is based on the bandwidth demand of this channel, remaining N2 time slot can be used for up-link or downlink transmission.Such as, as shown in Figure 4, by front 5 N2 time slots (N21) for ul transmissions.Ensuing 5 continuous print N2 time slot (N22) are used for downlink transmission.
D, complete self adaptation band bandwidth distribution:
Bandwidth allocation manager system, it is assumed that each frequency all carries portfolio as much, allows each frequency carry different portfolios.Bandwidth according to unit frequency can calculate the portfolio that he can carry, and just can calculate the frequency number needed for community further according to the portfolio of transmission needed for community.The data base using business frequency in such a system completes adaptive bandwidth distribution.During calculating, in addition it is also necessary to fully take into account the interference and change thereof being likely to occur on frequency, thus flow out certain surplus to the frequency number needed for community.
The present invention is to be triggered frequency by transmission business dynamically to distribute, and the initial setting up by bandwidth demand of the bandwidth allocation manager system is monitored in real time, dynamically distributed, effectively make use of frequency resource, as shown in Figure 5.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify or equivalent to the detailed description of the invention of the present invention, and without departing from any amendment of spirit and scope of the invention or equivalent, it all should be contained in the middle of scope of the presently claimed invention.
Claims (1)
1. the adaptive time division duplexing method of the Adaptive Time Division Duplex system dynamically distributed for wireless communication system, it is characterised in that the system of described method is the Adaptive Time Division Duplex system dynamically distributed for wireless communication system, and described system includes:
Bandwidth allocation manager system: for 1) renewal in business and demand band data storehouse；2) initial setting up of user's bandwidth requirements is completed；3) transmit traffic flag and up-to-date business and demand band data storehouse according to user and complete the renewal of bandwidth requirements；4) memory user's up-to-date demand bandwidth, as the reference value of initial setting up next time；
Subscriber unit: send transmission traffic flag for described bandwidth allocation manager system；
Frequency band parameters arranges unit: initial setting up and renewal band bandwidth parameter for band bandwidth are arranged；
Described method comprises the steps:
A, initial band bandwidth parameter is set；
B, real-time Observational frequency band bandwidth demand；
C, renewal band bandwidth demand are arranged；
D, complete self adaptation band bandwidth distribution；
In described step A, set up the data base of wireless communication transmissions business and desire bandwidth, and wireless communication transmissions business and demand bandwidth are carried out the labelling of distinct symbols；Described database service is in bandwidth allocation manager system；Described bandwidth allocation manager system arranges initial band bandwidth parameter；
Described band bandwidth parameter includes transmitting service parameter and bandwidth demand parameter；
Described wireless communication transmissions business includes speech business, video traffic and power information capturing service；
In described step B, the monitor value of described bandwidth allocation manager system real-time reception to subscriber unit each time point bandwidth demand；Described monitor value by subscriber unit transmit business time, transmission traffic flag is sent to bandwidth allocation manager system, bandwidth allocation manager system identification transmission traffic flag, is demodulated into transmission business demand bandwidth, transmission business demand bandwidth command is sent to parameter set unit；
In described step C, bandwidth parameter arrange unit receive real-time bandwidth demand time, update band bandwidth demand arrange；In updating band bandwidth demand setting up procedure, cell business volume in wireless communication system is monitored in real time；The object of monitoring is cell transmission traffic flag；The result of monitoring available frequency needed for calculating community is counted；
Described renewal band bandwidth demand arranges and comprises the steps:
I, summarizing cell service kind and quantity；
II, Zone kind and quantity according to statistics carry out frequency number needed for community and calculate；
III, according to calculate community needed for frequency number distribution frequency；
Described available frequency includes idle frequency and has used frequency；Described available frequency refers to all frequencies after being divided in country's nothing delegates the frequency range of power；Described idle frequency refers to be not allocated in frequency pool the frequency of user；
Use time slot allocative decision based on frame, be dynamically up-link or downlink transmission period distribution time slot；The program allows system to be the frame slot that downlink transmission dynamically distributes the first quantity, constitutes residue frame time slot for ul transmissions simultaneously；Another kind of scheme based on frame also allows for by system being the frame slot that downlink transmission dynamically distributes the first quantity, according to channel width need by body in frame slot distribute to up-link or downlink transmission；By a frame definition for including N number of continuous print time slot, wherein N remains constant；In first scheme based on frame, communication system is N1 time slot of downlink transmission dynamic construction the oneth, and wherein N is more than or equal to N1；For remaining N2 the time slot of ul transmissions dynamic construction, wherein N2 is equal to N-N1；
Second scheme based on frame in addition to no longer constitute N2 time slot of fertility for ul transmissions, should allocative decision based on frame scheme based on frame with first identical, N2 time slot the most not only giving birth to for ul transmissions composition, N2 is equal to N-N1；And it is based on the bandwidth demand of this channel, and remaining N2 time slot is used for up-link or downlink transmission, including front 5 N2 time slot N21 are used for ul transmissions, ensuing 5 continuous print N2 time slot N22 are used for downlink transmission；
In described step D, transmission business triggering frequency and dynamically distribute, bandwidth allocation manager system completes the distribution of self adaptation band bandwidth according to step A-C.
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| CN104579764A (en) * | 2014-12-26 | 2015-04-29 | 中国电子科技集团公司第二十研究所 | Dynamic data link resource allocation method based on shared time slot pools |
| WO2018170862A1 (en) | 2017-03-23 | 2018-09-27 | 深圳市大疆创新科技有限公司 | Aerial vehicle and external device thereof, and communication method, apparatus and system |
| CN111327391B (en) * | 2018-12-17 | 2023-06-30 | 深圳市中兴微电子技术有限公司 | Time division multiplexing method, device, system and storage medium |
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| CN1282493A (en) * | 1997-11-19 | 2001-01-31 | 通信集合公司 | An adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within wireless communication system |
| EP1679841A2 (en) * | 2000-07-11 | 2006-07-12 | Cisco Technology, Inc. | Method and apparatus for bandwidth request/grant protocols in a wireless communication system |
| CN101527934A (en) * | 2008-03-05 | 2009-09-09 | 上海华为技术有限公司 | Method, system and correlative device for allocating resources |
| CN102333315A (en) * | 2010-07-12 | 2012-01-25 | 中国移动通信集团公司 | Frequency resource allocation method, device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1282493A (en) * | 1997-11-19 | 2001-01-31 | 通信集合公司 | An adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within wireless communication system |
| EP1679841A2 (en) * | 2000-07-11 | 2006-07-12 | Cisco Technology, Inc. | Method and apparatus for bandwidth request/grant protocols in a wireless communication system |
| CN101527934A (en) * | 2008-03-05 | 2009-09-09 | 上海华为技术有限公司 | Method, system and correlative device for allocating resources |
| CN102333315A (en) * | 2010-07-12 | 2012-01-25 | 中国移动通信集团公司 | Frequency resource allocation method, device and system |
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