CN102064902B - Asymmetric time division multiplexing method of digital radio transmission and realizing system thereof - Google Patents
Asymmetric time division multiplexing method of digital radio transmission and realizing system thereof Download PDFInfo
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Abstract
The invention discloses an asymmetric time division multiplexing method of digital radio transmission, and a system comprising a main control end and a group of controlled ends in communication with the main control end is provided in the method. The system has three states: an idle state, an uplink state and a downlink state, and keeps the synchronization time of t ms at the start of each frequency hopping period for transmitting synchronous pockets. The invention also discloses the system of the asymmetric time division multiplexing method of digital radio transmission, comprising the main control end and the controlled ends in communication with the main control end, wherein the main control end comprises a main control radio transmit-receive unit, a main control timing unit and a main control arbitration unit, and each controlled end comprises a controlled radio transmit-receive unit, a controlled timing unit and a controlled arbitration unit. The invention automatically finishes the synchronous time correction of the main control end and the controlled ends in the communication process, ensures the communication stability, and also solves the problems of time synchronization, transmit-receive arbitration, and the like in communication transmission control.
Description
Technical field
The present invention relates to a kind of digital radio transmission method and realize system, particularly a kind of asymmetric time-sharing multiplexing method of digital radio transmission and realize system.
Background technology
Along with the development of wireless communication technology, because digital signal has unique advantage at comparative simulation signal aspect anti-interference, fail safe, increased the digital radio transfer function in increasing consumer and monitoring product.
Traditional digital radio transmits or can only support the both-way communication of a main control end and a controlled end; Adopt the mode of broadcasting, can support the function of one-to-many, but can't realize both-way communication.And, can't accomplish in full accordly on engineering due to the clock frequency of each equipment, system also can cause the unstable of time synchronized in long-play.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is for the deficiencies in the prior art, a kind of asymmetric time-sharing multiplexing method of digital radio transmission is provided and realizes system.
The invention discloses a kind of asymmetric time-sharing multiplexing method of digital radio transmission, comprise the system that a main control end (Control Unit is called for short CU) and one group of controlled end of communicating by letter with main control end (Slave Unit is called for short SU) form; Controlled end can only be communicated by letter with main control end, can not intercom mutually between controlled end; Main control end realizes receiving and dispatching with the negotiation of controlled end synchronizes, and asymmetrical Bandwidth Allocation Policy is adopted in up-downgoing, realizes the transmitting-receiving of data by time-sharing multiplex.By synchronous-answering, provide one to be independent of data channel application layer command transfer passage in addition.The advantage of sepaerate order passage is low delay, can be application layer real-time command response is provided.
Described system is divided into free time (IDLE), up (UPWARD, the reception of main control end transmission controlled end), descending (DOWNWARD, the reception of controlled end transmission main control end) three states, each state duration is the n millisecond, described n millisecond is as the hop period of system; Generally can be set to 10 ~ 100 milliseconds, for example 60 milliseconds particularly.
Described main control end sends sync packet in the lock in time of the initial reservation t millisecond of each hop period, within lock in time, main control end sends several identical sync packet continuously to controlled end face, flag bit is set in described sync packet determines whether controlled end can send response packet, comprises order data in sync packet and response packet; During concrete the application, main control end sends sync packet in the initial lock in time that can keep 1 millisecond of each hop period.For guaranteeing synchronous stablizing, within lock in time, main control end sends 3 ~ 4 identical sync packet continuously to controlled end.
The asymmetric method of salary distribution is adopted in the uplink and downlink transmission, and when there is no upstream data, the transmission bandwidth between main control end and controlled end is all distributed to descending; When having upstream data, up-downgoing is by the preset proportion allocation of transmission bandwidth.
In the method for the invention, when system is in idle condition, comprise the steps:
Step (21), main control end is in the transmission state, and controlled end is in accepting state, and controlled end waits at fixing frequency the sync packet that main control end sends;
Step (22), main control end send sync packet in the preamble time of every hop period t millisecond, the order of sync packet is masked as " IDLE ", and answer logo is set;
Step (23), all controlled ends receive sync packet, and timing cycle is hop period;
Step (24), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise the order data of controlled end; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (25), idling cycle finishes, and main control end goes to the transmission state.
In the method for the invention, when system is in downstream state, comprise the steps:
Step (31), main control end send sync packet to all controlled ends, and the order of sync packet is masked as " DOWNWARD ", and the controlled end device numbering that device flag was activated for this cycle sends data by the controlled end that is activated accordingly, and main control end goes to accepting state;
Step (32), all controlled ends receive sync packet, and timing cycle is hop period, if not set of the answer logo in sync packet goes to step (35);
Step (33), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (34), main control end receives the response packet of controlled end;
Step (35), the controlled end that is activated goes to the transmission state, sends packet to main control end;
Step (36), downstream cycle finishes, and main control end goes to the transmission state, and the controlled end that is activated goes to accepting state.
In the method for the invention, when system is in uplink state, comprise the steps:
Step (41), main control end send sync packet to all controlled ends, and the order of sync packet is masked as " UPNWARD ", and the controlled end device numbering that device flag was activated for this cycle is by the controlled end receive data that is activated accordingly;
Step (42), all controlled ends receive sync packet, and timing cycle is hop period, if not set of the answer logo in sync packet goes to step (45);
Step (43), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (44), main control end receives response packet, and main control end goes to the transmission state;
Step (45), main control end send packet to the controlled end that is activated;
Step (46), up end cycle.
The invention also discloses a kind of system of asymmetric time-sharing multiplexing method of digital radio transmission, comprise a main control end, and one group of controlled end of communicating by letter with main control end;
Described main control end comprises master control wireless transmit/receive units, master control timing unit and master control arbitration unit;
Described master control wireless transmit/receive units is used for completing the fixed-size data packet transceive of main control end on the 2.4G frequency range, and support configurable Transmit enable, realize semiduplex transmitting-receiving, when system does not work, this element enters idle mode (Standby Mode), reduces system power dissipation; Described master control timing unit is used for providing the timing (precision is generally 1 millisecond) of main control end, comprises that the time interval is that the work period timing of T, synchronization timing and the time interval that the time interval is s are replying regularly of r*N; Described master control arbitration unit is used for determining the reiving/transmitting state of described device;
Described controlled end comprises controlled wireless transmit/receive units, controlled timing unit and controlled arbitration unit;
Described controlled wireless transmit/receive units is used for completing the fixed-size data packet transceive of controlled end, and supports configurable Transmit enable, realizes semiduplex transmitting-receiving; Described controlled timing unit is used for providing the timing of controlled end, comprises work period timing, synchronization timing and replys regularly; Described controlled arbitration unit obtains the reiving/transmitting state of described device for the sync packet of sending by receiving described master control wireless transmit/receive units.
In system of the present invention, the arbitration unit of described main control end and the arbitration unit of controlled end adopt following resolving strategy: system is in non operating state, current period is idle, and the answer logo in sync packet is set, and current period allows to accept the response packet of controlled end;
System is in running order, if the Transmit-Receive Unit of main control end does not have packet, current period is descending;
System is in running order, does not send packet if the Transmit-Receive Unit of main control end comprises, by preset proportion allocation of downlink and descending periodicity;
System is in running order, determines by preset proportion whether current period comprises controlled end and reply, and every n-1 all after date of nonreply connects one acknowledge cycle;
The controlled end of current activation is brought in appointment by master control, the controlled end of a plurality of activation and the communication time of the main control end mean allocation uplink and downlink cycle on the time cycle.
Beneficial effect: the present invention utilizes semiduplex wireless transmission unit to realize that a main control end is to the instant two-way communication of a plurality of controlled ends, and automatically complete the synchronised clock check and correction of controlled end and main control end at communication process, guarantee the stability of communicating by letter, solve simultaneously the problems such as time synchronized in controlling of transmission in communication, transmitting-receiving arbitration.With respect to based on 802.11 wireless local area network method, this method has greater advantage owing to not needing wireless aps (access point) aspect networking cost, transmission range and flexibility.With respect to 1 couple, 1 transmission method commonly used, the present invention can support the multi-channel data transmission of 1 pair 16 at most, has clear and definite advantage on performance.And adopting the asymmetrical method of up-downgoing, downlink bandwidth can fully be ensured, is specially adapted to wireless digital doorbell, wireless multimedia transmission etc. to the product scope of downlink bandwidth sensitivity.
Description of drawings
The present invention is done further illustrate below in conjunction with figure and embodiment, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the system configuration schematic diagram.
Fig. 2 is the idling cycle schematic diagram.
Fig. 3 is the downstream cycle schematic diagram.
Fig. 4 is upper line period schematic diagram.
Fig. 5 is the system and device schematic diagram of main control end.
Fig. 6 is the system and device schematic diagram of controlled end.
Fig. 7 is the transport layer that realizes by the present invention and the interaction figure between application layer.
Embodiment
As shown in Figure 1, the invention discloses a kind of system of asymmetric time-sharing multiplexing method of digital radio transmission, comprise a main control end, and one group of controlled end of communicating by letter with main control end; Described main control end comprises master control wireless transmit/receive units, master control timing unit and master control arbitration unit; Described master control wireless transmit/receive units is used for completing the fixed-size data packet transceive of main control end, and supports configurable Transmit enable, realizes semiduplex transmitting-receiving; Described master control timing unit is used for providing the timing of main control end, comprises work period timing, synchronization timing and replys regularly; Described master control arbitration unit is used for determining the reiving/transmitting state of described device; Described controlled end comprises controlled wireless transmit/receive units, controlled timing unit and controlled arbitration unit; Described controlled wireless transmit/receive units is used for completing the fixed-size data packet transceive of controlled end, and supports configurable Transmit enable, realizes semiduplex transmitting-receiving; Described controlled timing unit is used for providing the timing of controlled end, comprises work period timing, synchronization timing and replys regularly; Described controlled arbitration unit obtains the reiving/transmitting state of described device for the sync packet of sending by receiving described master control wireless transmit/receive units.
The invention also discloses a kind of asymmetric time-sharing multiplexing method of digital radio transmission, comprise the system that a main control end and one group of controlled end of communicating by letter with main control end form; Described system is divided into free time, up, descending three states, and each state duration is the n millisecond, and described n millisecond is as the hop period of system; Described main control end sends sync packet in the lock in time of the initial reservation t millisecond of each hop period, within lock in time, main control end sends several identical sync packet continuously to controlled end face, flag bit is set in described sync packet determines whether controlled end can send response packet, comprises order data in sync packet and response packet; The asymmetric method of salary distribution is adopted in the uplink and downlink transmission, and when there is no upstream data, the transmission bandwidth between main control end and controlled end is all distributed to descending; When having upstream data, up-downgoing is by the preset proportion allocation of transmission bandwidth.
Free time, descending, the initial of up three kinds of period of state all is comprised of sync packet and optional response packet, and comprises the application layer command channel in sync packet and response packet; Controlled end is understood more accurate timer automatically in each synchronizing process.
Below describe the present invention in detail by legend.
In the embodiment of the present invention idle condition and transmitting-receiving be synchronous, as shown in Figure 2.
(1) main control end is in the transmission state; Controlled end is in accepting state, waits for the sync packet of main control end at fixing frequency (be traditionally arranged to be greater than 1 MHz, as be arranged on 2407.5MHz).
(2) main control end within 1 millisecond of preamble time of the hop period of every 60 milliseconds, sends sync packet.The order of sync packet is masked as IDLE, and answer logo is set, and represents that this cycle is idling cycle, and allows controlled end to send response packet.
(3) all controlled ends receive sync packet, and the local timer of resetting, timing cycle are 60 milliseconds of hop periods.
(4) main control end goes to accepting state, and controlled end goes to the transmission state.All controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; The form of order data can be comprised of 12 bytes, wherein 4 bytes are synchronous head and sequence number, other 8 bytes are bind commands, connection request, connect the data compositions such as reply, total transmitting time is r*N, and r is single controlled end transmitting time, N is the controlled end number, and controlled end returns to accepting state.Certainly, the concrete form of order data is kept for by the application demand of the specific product of using this device and is decided.
(5) idling cycle finishes, and main control end goes to the transmission state.
Downlink data transmission in the embodiment of the present invention, as shown in Figure 3.
(1) main control end send sync packet to all controlled ends.The order of sync packet is masked as DOWNWARD, and device flag is the controlled end device numbering that this cycle is activated, and represents that this cycle is downstream cycle, and controlled end sends data by being activated accordingly.Main control end goes to accepting state.
(2) all controlled ends receive sync packet, and the local timer of resetting, timing cycle are the T(60 millisecond).If not set of the answer logo in sync packet went to for the 5th step.
(3) main control end goes to accepting state, and controlled end goes to the transmission state.All controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and r is single controlled end transmitting time, and N is the controlled end number.Controlled end returns to accepting state.
(4) main control end receives response packet.
(5) controlled end that is activated goes to the transmission state, sends packet to main control end.
(6) downstream cycle finishes, and main control end goes to the transmission state, and the controlled end that is activated goes to accepting state.
Transmitting uplink data in the embodiment of the present invention, as shown in Figure 4:
(1) main control end sends sync packet to all controlled ends.The order of sync packet is masked as UPNWARD, and device flag is the controlled end device numbering that this cycle is activated, and represents that this cycle is upper line period, by the controlled end receive data that is activated accordingly.
(2) all controlled ends receive sync packet, and the local timer of resetting, timing cycle are the T(60 millisecond).If not set of the answer logo in sync packet went to for the 5th step.
(3) main control end goes to accepting state, and controlled end goes to the transmission state.All controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and r is single controlled end transmitting time, and N is the controlled end number.Controlled end returns to accepting state.
(4) main control end receives response packet.Main control end goes to the transmission state.
(5) main control end sends packet to the controlled end that is activated.
(6) up end cycle.
The resolving strategy of arbitration unit in the embodiment of the present invention:
The arbitration unit of main control end determines the reiving/transmitting state (free time, descending, up) of current period, and in the order sign that wraps with frequency during reiving/transmitting state is write.Controlled end reads current reiving/transmitting state from the sync packet that receives.
(1) system is in non operating state, and it is idle that current period is always, and the answer logo in sync packet is set all the time, shows that current period allows to accept the response packet of controlled end.
(2) system is in running order, there is no packet if main control end sends buffering area, and current period is descending.
(3) system is in running order, exists and does not send packet if main control end sends buffering area, by preset proportion k allocation of downlink and descending periodicity.For example, 1 downstream cycle is inserted after 3 downstream cycles in k=3.Ordinary circumstance, the numerical value setting of K is larger, and the descending periodicity of expression experience is more.
(4) system is in running order, determines by preset proportion n whether current period comprises controlled end and reply, and every n-1 all after date of nonreply connects one acknowledge cycle.For example, generally select n=4, there is acknowledge cycle in every 3 nonreply cycles with 1.
(5) controlled end of current activation is specified by application layer.The mean allocation uplink and downlink cycle between the controlled end of a plurality of activation.
In the embodiment of the present invention, main control end arbitration unit transmitting-receiving timesharing is switched, as shown in Figure 5:
(1) main control end is followed resolving strategy and is generated sync packet.
(2) main control end is made as s with timing cycle, sends sync packet in the s timeslice.Controlled end numbering i is initialized as 0.
(3) be timed to after date, if the answer logo in sync packet is set, timing cycle is reset to r, receives the response packet of controlled end i in the r timeslice; If the answer logo in sync packet is not set, go to (6).
(4) if comprise order data in response packet, send to application layer.
(5) i=i+1 repeats (3) to (4) until the response packet of all N controlled end is all received.
(6) be timed to after date, the regular cycle is reset to T – s – r * N(and replys) or T – s(nonreply), T is synchronizing cycle.
If the order in sync packet is masked as the IDLE(free time), transceiving data bag not.
If it is up upper at h skd as A dfasdkl that the order in sync packet is masked as DOWNWARD(; Ljiasdasfsdfasdf is descending), the receive data bag.
If it is up upper at h skd as A dfasdkl that the order in sync packet is masked as UPWARD(; Ljiasdasfsdfasdf is up), send packet.
(7) be timed to after date, this cycle finishes, and goes to (1) and begins next cycle.
In the embodiment of the present invention, controlled end arbitration unit transmitting-receiving timesharing is switched, as shown in Figure 6:
(1) controlled end is made as s with timing cycle, receives sync packet in the s timeslice.
(2) if comprise order data in sync packet, send to application layer.
(3) be timed to after date, if the answer logo in sync packet is set, it is device numbering that timing cycle is reset to ID*r(ID); If the answer logo in sync packet is not set, go to (5).
(4) be timed to after date, timing cycle is reset to r, sends response packet in the r timeslice.
(5) be timed to after date, it is controlled end number in system that timing cycle is reset to (N – ID – 1) * r(N, 0≤ID＜N).
(6) be timed to after date, the regular cycle is reset to T – s – r * N(and replys) or T – s(nonreply), T is synchronizing cycle.
If the order in sync packet is masked as the IDLE(free time), transceiving data bag not.
If it is up upper at h skd as A dfasdkl that the order in sync packet is masked as DOWNWARD(; Ljiasdasfsdfasdf is descending), send packet.
If it is up upper at h skd as A dfasdkl that the order in sync packet is masked as UPWARD(; Ljiasdasfsdfasdf is up), the receive data bag.
(7) be timed to after date, this cycle finishes, and goes to (1) and begins next cycle.
The transport layer and the hierarchical structure between application layer and the data interaction that realize according to the present invention, as shown in Figure 7:
(1) packet of application layer transmission is stored in and sends in buffering area.Main control end is taken out the packet that sends in buffering area and is sent in downstream cycle at upper line period, controlled end.
(2) main control end is in the data that downstream cycle, controlled end are received in upper line period are stored in reception buffer zone.Application layer is from the reception buffer zone read data packet.
(3) application layer sends self-defining order data to transport layer, and transport layer wraps (main control end) by order or response packet (controlled end) sends.
(4) transport layer receives order bag (controlled end) or response packet (main control end), and the order data that takes out wherein sends to application layer.
The invention provides the asymmetric time-sharing multiplexing method of a kind of digital radio transmission and realize thinking and the method for system; method and the approach of this technical scheme of specific implementation are a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.
Claims (4)
1. the asymmetric time-sharing multiplexing method of a digital radio transmission, is characterized in that, comprises the system that a main control end and one group of controlled end of communicating by letter with main control end form;
Described system is divided into free time, up, descending three states, and each state duration is the n millisecond, and described n millisecond is as the hop period of system;
Described main control end sends sync packet in the lock in time of the initial reservation t millisecond of each hop period, within lock in time, main control end sends several identical sync packet continuously to controlled end face, flag bit is set in described sync packet determines whether controlled end can send response packet, comprises order data in sync packet and response packet;
The asymmetric method of salary distribution is adopted in the uplink and downlink transmission, and when there is no upstream data, the transmission bandwidth between main control end and controlled end is all distributed to descending; When having upstream data, up-downgoing is by the preset proportion allocation of transmission bandwidth;
When system is in idle condition, carry out following steps:
Step (21), main control end is in the transmission state, and controlled end is in accepting state, and controlled end waits at fixing frequency the sync packet that main control end sends;
Step (22), main control end send sync packet in the preamble time of every hop period t millisecond, the order of sync packet is masked as " IDLE ", and answer logo is set;
Step (23), all controlled ends receive sync packet, and timing cycle is hop period;
Step (24), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise the order data of controlled end; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (25), idling cycle finishes, and main control end goes to the transmission state.
2. the asymmetric time-sharing multiplexing method of a kind of digital radio transmission according to claim 1, is characterized in that, when system is in downstream state, comprises the steps:
Step (31), main control end send sync packet to all controlled ends, and the order of sync packet is masked as " DOWNWARD ", and the controlled end device numbering that device flag was activated for this cycle sends data by the controlled end that is activated accordingly, and main control end goes to accepting state;
Step (32), all controlled ends receive sync packet, and timing cycle is hop period, if not set of the answer logo in sync packet goes to step (35);
Step (33), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (34), main control end receives the response packet of controlled end;
Step (35), the controlled end that is activated goes to the transmission state, sends packet to main control end;
Step (36), downstream cycle finishes, and main control end goes to the transmission state, and the controlled end that is activated goes to accepting state.
3. the asymmetric time-sharing multiplexing method of a kind of digital radio transmission according to claim 1, is characterized in that, when system is in uplink state, comprises the steps:
Step (41), main control end send sync packet to all controlled ends, and the order of sync packet is masked as " UPNWARD ", and the controlled end device numbering that device flag was activated for this cycle is by the controlled end receive data that is activated accordingly;
Step (42), all controlled ends receive sync packet, and timing cycle is hop period, if not set of the answer logo in sync packet goes to step (45);
Step (43), main control end goes to accepting state, and controlled end goes to the transmission state, and all controlled ends send response packet successively by the device numbering order, wherein comprise controlled end application layer order data; Total transmitting time is r*N, and wherein r is single controlled end transmitting time, and N is the controlled end number, and controlled end returns to accepting state;
Step (44), main control end receives response packet, and main control end goes to the transmission state;
Step (45), main control end send packet to the controlled end that is activated;
Step (46), up end cycle.
4. a system that realizes the asymmetric time-sharing multiplexing method of digital radio transmission claimed in claim 1, is characterized in that, comprises a main control end, and one group of controlled end of communicating by letter with main control end;
Described main control end comprises master control wireless transmit/receive units, master control timing unit and master control arbitration unit;
Described master control wireless transmit/receive units is used for completing the fixed-size data packet transceive of main control end, and supports configurable Transmit enable, realizes semiduplex transmitting-receiving; Described master control timing unit is used for providing the timing of main control end, comprises work period timing, synchronization timing and replys regularly; Described master control arbitration unit is used for determining the reiving/transmitting state of described device;
Described controlled end comprises controlled wireless transmit/receive units, controlled timing unit and controlled arbitration unit;
Described controlled wireless transmit/receive units is used for completing the fixed-size data packet transceive of controlled end, and supports configurable Transmit enable, realizes semiduplex transmitting-receiving; Described controlled timing unit is used for providing the timing of controlled end, comprises work period timing, synchronization timing and replys regularly; Described controlled arbitration unit obtains the reiving/transmitting state of described device for the sync packet of sending by receiving described master control wireless transmit/receive units;
The arbitration unit of described main control end and the arbitration unit of controlled end adopt following resolving strategy:
System is in non operating state, and current period is idle, and the answer logo in sync packet is set, and current period allows to accept the response packet of controlled end;
System is in running order, if the Transmit-Receive Unit of main control end does not have packet, current period is descending;
System is in running order, does not send packet if the Transmit-Receive Unit of main control end comprises, by preset proportion allocation of downlink and descending periodicity;
System is in running order, determines by preset proportion whether current period comprises controlled end and reply, and every n-1 all after date of nonreply connects one acknowledge cycle;
The controlled end of current activation is brought in appointment by master control, the controlled end of a plurality of activation and the communication time of the main control end mean allocation uplink and downlink cycle on the time cycle.
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| TWI551099B (en) * | 2013-01-22 | 2016-09-21 | 新唐科技股份有限公司 | Communication system, master device and communication method thereof |
| CN104684027A (en) * | 2013-11-28 | 2015-06-03 | 中兴通讯股份有限公司 | Asymmetric bandwidth allocation method and device and evolved base station |
| CN113114404B (en) * | 2021-04-01 | 2023-06-02 | 四川创智联恒科技有限公司 | Device and method for expanding universal eCPRI interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0910188A1 (en) * | 1997-10-16 | 1999-04-21 | TELEFONAKTIEBOLAGET L M ERICSSON (publ) | A method of and a system for voice and data radio communication providing improved interference diversity |
| CN1371582A (en) * | 1999-06-25 | 2002-09-25 | 艾利森电话股份有限公司 | Resource management and traffic control in time-division-duplex communication systems |
| CN1985478A (en) * | 2004-07-20 | 2007-06-20 | 国际商业机器公司 | Communication device, communication system, communication method, communication service method, program, and recording medium |
| CN101606347A (en) * | 2007-04-11 | 2009-12-16 | Lg电子株式会社 | In the TDD system, send the method for schedule information |
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