CN1980462A - Method for eliminating common-frequency interference in time-division multiple-address honeycomb communication system - Google Patents
Method for eliminating common-frequency interference in time-division multiple-address honeycomb communication system Download PDFInfo
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- CN1980462A CN1980462A CNA2005101264243A CN200510126424A CN1980462A CN 1980462 A CN1980462 A CN 1980462A CN A2005101264243 A CNA2005101264243 A CN A2005101264243A CN 200510126424 A CN200510126424 A CN 200510126424A CN 1980462 A CN1980462 A CN 1980462A
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Abstract
This invention includes the following steps. (1) Each cell is configured with at least one switch time slot (STS). Neighbor cells are configured with different STSs, which stagger mutually in the time domain. (2) The user terminal (UT) tests periodically the receiving signal intensities of the service cell and neighbor cells. (3) The test result is report to the base system (BS) by UT. (4) According to this intensity test result, BS dispatches between UTs the wireless resource of STS and non-STS in the service cell and STS and/or non-STS in the destination cell. This prevents the user in overlap covered area from interfering of same frequency.
Description
Technical field
The present invention relates to field of wireless communication, specifically, relate to and in wireless cellular network, eliminate co-channel interference, realize being particularly useful for time division multi-address cellular communication system (such as TD-CDMA, TD-SCDMA) with the method for frequency switching.
Background technology
Beehive net is the modal networking modes of wireless telecommunications, and network topology structure as shown in Figure 1.Because network topology structure exactly likes honeycomb structure, Cellular Networks hence obtains one's name.Each cellular unit is represented the coverage of a base station transceiver in the Cellular Networks, and radio communication chain circuit can be set up with the base station in the terminal station in this zone.A plurality of transceivers are formed network, realize the continuous covering of a panel region, for user terminal station provides immanent wireless communication services.
One of beehive net purpose is in order to solve the repeated use of finite frequency resource.Different districts transceiver in the cellular network reaches the purpose of boosting the efficiency of frequency resources utilization by reusing identical frequency resource.In the time of cellular network channelized frequencies resource, brought the interference problem between the co-frequency cell.How eliminating co-channel interference becomes the key of beehive net.The cellular network of Ying Yonging is a simulation fdma system (FDMA) the earliest, adopts the frequency division networking mode, and promptly neighbor cell uses different frequencies, has between the sub-district of identical frequency across the sub-district of using different frequent points.Make the overlapping area of coverage on neighbor cell border not have co-channel interference like this.But frequency division networking mode frequency efficiency is lower, and certain frequency has been used in a sub-district, and this frequency of repeated use is not allowed at least 6 sub-districts on every side.We say that the frequency repeat utilization ratio of frequency division networking is 1: 7.
The representative of Digital Cellular System is tdma (TDMA) and CDMA (Code Division Multiple Access) (CDMA).
So-called code division multiple access is meant the pseudo noise code differentiation base station of the mutual nearly orthogonal of application and user's technology.Cdma system adopts CDMA (Code Division Multiple Access) not only to solve problem of co-channel interference effectively, makes the frequency repeat utilization ratio of cellular network reach 1: 1 in theory simultaneously.
So-called time-division multiple address system is meant voice, the data message of distinguishing different user by different time-gap, disturbs to avoid producing between the different user.For the time-division multiple address system that adopts the TDD communication mode; its uplink downlink is shared same frequency resource; between uplink and downlink timeslot, leave enough big protection time slot, to avoid between uplink and downlink timeslot, having because crosstalking of causing of aerial transmission delay, as shown in Figure 2.Network Synchronization based on the TDMA radio network requirement strictness of TDD.For the time-division multiple address system that adopts the FDD communication mode, its uplink downlink uses different frequency resources, leaves enough big protection frequency band between uplink downlink, with crosstalking of avoiding producing between uplink downlink.The representative of FDD tdma is GSM.What the GSM cellular network adopted in essence is the frequency division networking plan, and frequency repeat utilization ratio is far smaller than the frequency repeat utilization ratio of CDMA.Patent CN97180489 " improves the way of co-channel interference in the cellular communication system " and has introduced so-called " fractional load " scheme, in co-frequency cell, use the component frequency channel, the frequency channels that use simultaneously feasible sub-district with same frequency resources does not repeat as far as possible, to reach the reduction co-channel interference, reduce the purpose of frequency reuse distance.This method is the frequency division networking plan in essence.
The technology that overcomes co-channel interference that frequency division multiple access, time division multiple access and code division multiple access system adopt in beehive net more than has been discussed.The present invention propose a kind of at time-division multiple address system (TDMA) in the honeycomb identical networking, overcome the technology of co-channel interference.
Summary of the invention
Technical problem to be solved by this invention provides a kind ofly eliminates the method for co-channel interference at time-division multiple address system on the honeycomb identical networking, guarantee can not produce co-channel interference between the user of the overlapping area of coverage.
To achieve these goals, the invention provides the method for eliminating co-channel interference in a kind of TDMA cellular communication system, described wireless cellular communication system comprises base station system, core net and user terminal, and its characteristics are, comprise the steps:
Step 2, described user terminal periodically detect the received signal intensity of Serving cell and neighbor cell;
Step 3, described user terminal reports base station system with Serving cell and neighbor cell received power testing result;
Above-mentioned method, its characteristics are, in step 1, when comprising a plurality of radio channel resource in each time slot, then the resource that disposes according to service switchover amount demand is the whole resources in the described time slot, and perhaps the resource that is disposed is the part resource in the described time slot.
Above-mentioned method, its characteristics are, in step 1, for the TD-SCDMA single-carrier system, dispose one and switch time slot; Perhaps dispose a plurality of switching time slots according to the service switchover needs for TD-SCDMA multicarrier system.Said method for the TD-CDMA single-carrier system, disposes at least one and switches time slot; Perhaps dispose one or more switching time slots according to the service switchover needs for TD-CDMA multicarrier system.
Above-mentioned method, its characteristics are that a plurality of switching time slots are arranged on the same carrier wave or are arranged on the different carrier.
Above-mentioned method, its characteristics are that in step 3, described user terminal adopts periodically or based on the thresholding mode and reports testing result.
Above-mentioned method, its characteristics are that in step 4, described base station system comprises according to the concrete steps of the testing result enforcement scheduling of resource of user terminal:
If current service cell power P 1 is greater than the first thresholding P
Ph, neighbor cell received power P2 is less than the second thresholding P simultaneously
hAnd greater than the first thresholding P
PhThe time, then current service cell instruction user switches to the switching time slot of current service cell;
If current service cell power P 1 is less than neighbor cell received power P2, neighbor cell received power P2 is less than the second thresholding P simultaneously
hAnd greater than the first thresholding P
PhThe time, current service cell instruction user switches to the switching time slot of neighbor cell, and current service cell changes;
If current service cell received power P1 is greater than the second thresholding P
hThe time, neighbor cell received power P2 is less than the first thresholding P simultaneously
Ph, current service cell instruction user switches to the non-switching time slot of current service cell.
Above-mentioned method, its characteristics are, described base station system is implemented scheduling of resource according to the testing result of user terminal, control the conversion of described user terminal between following two kinds of communication states, wherein, state one uses the non-switchable resource communication of certain base station for user terminal, and state two user's terminals are used the switchable resource communication of certain base station.
Above-mentioned method, its characteristics are that concrete state exchange step comprises:
If P1＞P
PhAnd P
h＞P2＞P
Ph, then switch to Serving cell state two by Serving cell state one;
If P1＞P
hAnd P2＜P
Ph, then switch to Serving cell state one by Serving cell state two;
If (P1＜P
PhAnd P
h＞P2＞P
Ph) or (P
h＞P1＞P
PhAnd P2＞P
h), then switch to the state two of Target cell by the state one or two of Serving cell;
If P1＜P
PhAnd P2＞P
h, then be directly switch to the state one of Target cell by the state one or two of Serving cell;
Wherein, P1 is the received power of current service cell, and P2 is the neighbor cell received power, P
PhBe first thresholding, P
hIt is second thresholding.
Above-mentioned method, its characteristics are, are that each cell configuration is switched time slot and non-switching time slot in the base station system by a consistency operation maintenance module or regional Operation and Maintenance control desk.
Utilize the TDMA Radio Resource to divide on a time period, and co-channel interference is mainly in features such as cellular cell border generations, the present invention makes the user who belongs to the different base station sub-district in the overlapping area of coverage of cellular network (switch area) use different time slots, to avoid co-channel interference by timeslot scheduling.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
Description of drawings
Fig. 1: honeycomb communication network topological diagram;
Fig. 2: based on the communication time slot schematic diagram of the time-division multiple address system of time division duplex (TDD);
Fig. 3: the 10ms of TD-SCDMA system frame structure;
Fig. 4: the 5ms of TD-SCDMA system subframe structure;
Fig. 5: typical cellular communication system schematic diagram;
Fig. 6: the co-channel interference under two overlapping coverage conditions of cellular cell is eliminated;
Fig. 7: timeslot scheduling flow chart (embodiment 1);
Fig. 8: timeslot scheduling state diagram (embodiment 2);
Fig. 9: the co-channel interference under the situation of three sector base stations formation cellular network is eliminated.
Embodiment
With TD-SCDMA is example, and the structure of time slot of TD-SCDMA as shown in Figure 3 and Figure 4.Basic radio frames is the 10ms frame, and each 10ms radio frames is divided into two 5ms subframes again.Each 5ms subframe comprises 7 burst time slots and a special time slot.Protection bandwidth GP length is 96chips, is used to overcome the interference between the uplink downlink.Be called as professional transfer point between the adjacent up-downgoing burst time slot, agreement stipulates that each wireless sub-frame comprises two professional transfer points (referring to TS25.221 5A.1).First transfer point is positioned at special time slot, and standard code 0 time slot is as descending time slot, and 1 time slot is as ascending time slot.The professional transfer point of another one allows flexible configuration.For speech business, in the middle of second transfer point was configured in, promptly the uplink and downlink timeslot symmetry respectively accounted for 3 time slots.
Fig. 5 provides typical cellular radio communication system framework.Typical wireless cellular communication system generally includes base station system BSS and two parts of core net CN5.Base station system BSS and user terminal are set up communication link aloft, finish the two-way transmission of voice, data message; Business datum (voice or data) inserts public network by core net CN, as PSTN network or Internet network.Core net CN also is responsible for finishing to functions such as the authentication of validated user and mobile roaming controls.Base station system BSS comprises base station transceiver BTS11,12,13,16,17,18 and base station controller BSC 21,22.In time-division multiple address system, all BTS require synchronously, and are for example synchronous with gps system.Each base station controller BSC all has the Operation and Maintenance interface, is used for attended operation maintenance module OMM31,32.In network topological diagram, operating maintenance module OMM is as the centrostigma of the BSS of single base station system, can set up the route of communicating by letter with a plurality of BTS, finishes functions such as the data configuration of administration BSS system and plant maintenances.For the network that disposes a plurality of BSC, then dispose regional Operation and Maintenance control desk LOMC4 and administer a plurality of operating maintenance module OMM.In network topological diagram, regional Operation and Maintenance control desk LOMC is as the centrostigma of a plurality of base station system BSS, can set up the route of communicating by letter with all BTS under a plurality of BSS system, finishes functions such as the data configuration of a plurality of BSS system of being administered and plant maintenances.
Present embodiment is that each cell configuration in the base station system is switched time slot and non-switching time slot by consistency operation maintenance module OMM or regional Operation and Maintenance control desk LOMC at first.For single-carrier system, dispose one and switch time slot; For multicarrier system, can dispose a plurality of switching time slots according to the service switchover demand, a plurality of switching time slots can be on same carrier wave, also can be on different carrier.Comprise a plurality of Code Channels in each switching time slot.According to the demand of service switchover amount, can reserve and all also can reserve a part as switching channels.
The overlapping coverage condition (the simplest networking) of two sectors draws among Fig. 6.Represent 3 descending time slots (ascending time slot is also similar) with 3 grids, represent that with different filling patterns the different time-gap resource is occupied.If user S1 and sub-district 1 communication (user who belongs to sub-district 1), and 1 move to sub-district 2 from the sub-district, perhaps certain user S2 and sub-district 2 communications (the sheet family that belongs to sub-district 2), and 2 move to sub-district 1 from the sub-district, the timeslot scheduling process prescription is as follows
When user S1 (suppose can only receive in this region S 1 signal of sub-district 1, or the signal to noise ratio that receives sub-district 2 is less than a certain threshold value P in the sub-district during 1 A district
Ph), the resource that sub-district 1 distributes for this user is limited to the channel resource in time slot 2 or 3, so-called non-switching channels resource as far as possible; Equally, (suppose to receive the signal of sub-district 2, or the signal to noise ratio that receives sub-district 1 is less than a certain threshold value P in the sub-district during 2 E district as user S2 in this region S 2
Ph(Power thresholdfor Pre-Handoff, pre-switch thresholding).P
PhDefinite principle as follows: when the adjacent area received power meets or exceeds this thresholding, constitute probably the interference of Serving cell with the frequency received signal.This threshold setting can be easy to provide default setting according to theoretical calculate and emulation, also can be in real network according to concrete environment, this parameter is set flexibly reaches optimization effect), the resource that sub-district 2 distributes for this user is limited to the channel resource in time slot 1 or 2 as far as possible.
(suppose can receive simultaneously at B district S1 the signal of sub-district 1 and sub-district 2, the signal to noise ratio of sub-district 2 is greater than P when 1 A district moves to the B district from the sub-district as user S1
Ph, but less than threshold value P
hP
hDefinite principle: when received power meets or exceeds this thresholding, the co-channel interference level that this sub-district is subjected to is not enough to influence the Communications service quality.This threshold setting can be easy to provide default setting according to theoretical calculate and emulation, also can be in real network according to concrete environment, this parameter is set flexibly reaches optimization effect), sub-district 1 this user of instruction switches to the channel resource in the time slot 1, so-called switching channels resource; Similarly, (suppose can receive simultaneously at this zone user S2 the signal of sub-district 1 and sub-district 2, the signal to noise ratio of sub-district 1 is greater than P when 2 E district moves to the D district from the sub-district as user S2
Ph, but less than threshold value P
h), sub-district 2 these users of instruction switch to the channel resource in the time slot 3.
(suppose that the user can receive the signal of sub-district 1 and sub-district 2 simultaneously in this zone, the signal to noise ratio of sub-district 1 and sub-district 2 may be all greater than threshold value P when different directions all moves to the C district with S2 as user S1
h), the user S1 in this zone and S2 be respectively from different sectors, but owing to use different time slot communications, can not produce co-channel interference each other.
The user continues to move, when moving to the D district of sub-district 2 from the C district, user S1 (supposes to receive simultaneously the signal of sub-district 1 and sub-district 2 in this region S 1, the signal to noise ratio of sub-district 1 is less than the signal to noise ratio of sub-district 2), sub-district 1 this user of instruction switches to the channel resource in 2 time slots 3 of sub-district; Equally, when moving to the B district of sub-district 1 from the C district, user S2 (supposes to receive simultaneously the signal of sub-district 1 and sub-district 2 in this zone, the signal to noise ratio of sub-district 2 is less than the signal to noise ratio of sub-district 1), sub-district 2 these users of instruction switch to the channel resource in 1 time slot 1 of sub-district, finish switching.
The timeslot scheduling flow process as shown in Figure 7.
The user periodically detects the power P 1 of current service cell 1 and the power P 2 of neighbor cell 2.The user periodically or based on the thresholding mode reports testing result.Base station system is implemented scheduling of resource according to the testing result of user terminal.Concrete dispatching algorithm is as follows: when sub-district 1 power P 1 greater than thresholding P
Ph, sub-district 2 received power P2 are less than P simultaneously
hAnd greater than P
PhThe time, sub-district 1 instruction user switches to the switching time slot of sub-district 1; When P1 less than P2, simultaneously P2 is less than P
hAnd greater than P
PhThe time, sub-district 1 instruction user switches to the switching time slot of sub-district 2, and current service cell changes; Current service cell sub-district 1 received power P1 is greater than P
hThe time, sub-district 2 received power P2 are less than P simultaneously
Ph, sub-district 1 instruction user switches to the non-switching time slot of sub-district 1.
Another embodiment such as Fig. 8 of timeslot scheduling
Be in the following nothing more than two states of user in the communication process in the arbitrary cells:
State 2 definition: user terminal uses the switchable resource communication of certain base station.
No matter be in the sort of state, the user periodically detects the power P 1 of current service cell 1 and the power P 2 of neighbor cell 2.Neighbor cell has one, also has a plurality of.
The user periodically or based on the thresholding mode reports testing result.Base station system is implemented scheduling of resource according to the testing result of user terminal, the conversion of control user terminal between two kinds of communication states.
Concrete state transition condition is as follows:
State transition condition 1: if P1＞P
hAnd P
h＞P2＞P
Ph, switch to Serving cell state 2 by Serving cell state 1;
State transition condition 2: if P1＞P
hAnd P2＜P
Ph, switch to Serving cell state 1 by Serving cell state 2;
State transition condition 3: if (P1＜P
PhAnd P
h＞P2＞P
Ph) or (P
h＞P1＞P
PhAnd P2＞P
h), there is the state 1 or 2 of Serving cell to switch to the state 2 of Target cell;
State transition condition 4: if P1＜P
PhAnd P2＞P
h, be directly switch to the state 1 of Target cell by the state 1 or 2 of Serving cell;
Situation and above-described process for the overlapping covering in 3 sectors are similar, and difference is that the switching time slot of different districts may be adjacent.The problem of bringing is that the signal from different sectors can not guarantee time synchronized, may cause time slot to be crosstalked, thereby introduces co-channel interference.The relative co-frequency co-time slot of this class co-channel interference disturbs much smaller.When forming cellular network, suppose that cellular network is desirable network topology structure, adopt three sector networkings.The planning of then switching time slot as shown in Figure 9.
Round spot is represented the base station, and each base station comprises alpha, beta, three sectors of gamma.Dotted line in each sector and cell boarder area surrounded are represented the switch area, and the numeral in the switch area is switched the planning of time slot.As seen under desirable cellular topology structure, three switch time slot and can guarantee fully not have co-channel interference in Zone switched.But so desirable topological structure is seldom arranged in the real network, so still may there be co-channel interference in the switch area.This just needs three adjacent areas that statistics is switched the probability maximum in the network optimization process, makes local optimum.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (9)
1, eliminate the method for co-channel interference in a kind of TDMA cellular communication system, described wireless cellular communication system comprises base station system, core net and user terminal, it is characterized in that, comprises the steps:
Step 1, at least one switches time slot in each cell configuration, makes the different switching time slot of neighbor cell configuration, and staggers in time domain each other;
Step 2, described user terminal periodically detect the received signal intensity of Serving cell and neighbor cell;
Step 3, described user terminal reports base station system with Serving cell and neighbor cell received power testing result;
Step 4, described base station system is implemented wireless resource scheduling to described user terminal according to the power detection result between the non-switching time slot of the switching time slot of the non-switching time slot of the switching time slot of Serving cell, Serving cell, target switching cell and/or target switching cell.
2, method according to claim 1, it is characterized in that, in step 1, when comprising a plurality of radio channel resource in each time slot, then the resource that disposes according to service switchover amount demand is the whole resources in the described time slot, and perhaps the resource that is disposed is the part resource in the described time slot.
3, method according to claim 1 and 2 is characterized in that, in step 1, for the TD-SCDMA single-carrier system, disposes one and switches time slot; Perhaps dispose a plurality of switching time slots according to the service switchover needs for TD-SCDMA multicarrier system; For the TD-CDMA single-carrier system, dispose at least one and switch time slot; Perhaps dispose one or more switching time slots according to the service switchover needs for TD-CDMA multicarrier system.
4, method according to claim 3 is characterized in that, a plurality of switching time slots are arranged on the same carrier wave or are arranged on the different carrier.
5, method according to claim 1 is characterized in that, in step 3, described user terminal adopts periodically or based on the thresholding mode and reports testing result.
6, method according to claim 5 is characterized in that, in step 4, described base station system comprises according to the concrete steps of the testing result enforcement scheduling of resource of user terminal:
If current service cell power P 1 is greater than the first thresholding P
Ph, neighbor cell received power P2 is less than the second thresholding P simultaneously
hAnd greater than the first thresholding P
PhThe time, then current service cell instruction user switches to the switching time slot of current service cell;
If current service cell power P 1 is less than neighbor cell received power P2, neighbor cell received power P2 is less than the second thresholding P simultaneously
hAnd greater than the first thresholding P
PhThe time, current service cell instruction user switches to the switching time slot of neighbor cell, and current service cell changes;
If current service cell received power P1 is greater than the second thresholding P
hThe time, neighbor cell received power P2 is less than the one or two thresholding P simultaneously
Ph, current service cell instruction user switches to the non-switching time slot of current service cell.
7, method according to claim 5, it is characterized in that, described base station system is implemented scheduling of resource according to the testing result of user terminal, control the conversion of described user terminal between following two kinds of communication states, wherein, state one uses the non-switchable resource communication of certain base station for user terminal, and state two user's terminals are used the switchable resource communication of certain base station.
8, method according to claim 7 is characterized in that, concrete state exchange step comprises:
If P1＞P
PhAnd P
h＞P2＞P
Ph, then switch to Serving cell state two by Serving cell state one;
If P1＞P
hAnd P2＜P
Ph, then switch to Serving cell state one by Serving cell state two;
If (P1＜P
PhAnd P
h＞P2＞P
Ph) or (P
h＞P1＞P
PhAnd P2＞P
h), then switch to the state two of Target cell by the state one or two of Serving cell;
If P1＜P
PhAnd P2＞P
h, then be directly switch to the state one of Target cell by the state one or two of Serving cell;
Wherein, P1 is the received power of current service cell, and P2 is the neighbor cell received power, P
PhBe first thresholding, P
hIt is second thresholding.
9, according to claim 1,2,5,6,7 or 8 described methods, it is characterized in that, is that each cell configuration is switched time slot and non-switching time slot in the base station system by a consistency operation maintenance module or regional Operation and Maintenance control desk.
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| CN100499864C CN100499864C (en) | 2009-06-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010073060A1 (en) * | 2008-12-26 | 2010-07-01 | 夏普株式会社 | Method, system, user device, base station, program and storage medium for cooperative communication |
| CN102186200A (en) * | 2011-04-26 | 2011-09-14 | 中兴通讯股份有限公司 | Method, system and equipment for determining high-interference indicated target cell |
| CN101369831B (en) * | 2007-08-16 | 2012-05-23 | 中兴通讯股份有限公司 | Restraint method and system for interference between cells |
| CN103107826A (en) * | 2013-02-26 | 2013-05-15 | 海能达通信股份有限公司 | Multi-time-slot transceiver and method for avoiding same frequency interference thereof |
| WO2017054160A1 (en) * | 2015-09-30 | 2017-04-06 | 富士通株式会社 | Scheduling information determining device, and scheduling device, method and system |
| CN114337767A (en) * | 2021-11-15 | 2022-04-12 | 海能达通信股份有限公司 | Transfer device, data transmission method and communication system |
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2005
- 2005-12-09 CN CNB2005101264243A patent/CN100499864C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369831B (en) * | 2007-08-16 | 2012-05-23 | 中兴通讯股份有限公司 | Restraint method and system for interference between cells |
| WO2010073060A1 (en) * | 2008-12-26 | 2010-07-01 | 夏普株式会社 | Method, system, user device, base station, program and storage medium for cooperative communication |
| CN102186200A (en) * | 2011-04-26 | 2011-09-14 | 中兴通讯股份有限公司 | Method, system and equipment for determining high-interference indicated target cell |
| CN103107826A (en) * | 2013-02-26 | 2013-05-15 | 海能达通信股份有限公司 | Multi-time-slot transceiver and method for avoiding same frequency interference thereof |
| CN103107826B (en) * | 2013-02-26 | 2014-10-22 | 海能达通信股份有限公司 | Multi-time-slot transceiver and method for avoiding same frequency interference thereof |
| WO2017054160A1 (en) * | 2015-09-30 | 2017-04-06 | 富士通株式会社 | Scheduling information determining device, and scheduling device, method and system |
| CN108029095A (en) * | 2015-09-30 | 2018-05-11 | 富士通株式会社 | Scheduling information determining device, dispatching device, method and system |
| CN114337767A (en) * | 2021-11-15 | 2022-04-12 | 海能达通信股份有限公司 | Transfer device, data transmission method and communication system |
| CN114337767B (en) * | 2021-11-15 | 2023-12-19 | 海能达通信股份有限公司 | Transfer device, data transmission method and communication system |
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|---|---|
| CN100499864C (en) | 2009-06-10 |
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