CN101415233B - Method and apparatus for resource distribution - Google Patents
Method and apparatus for resource distribution Download PDFInfo
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- CN101415233B CN101415233B CN2007101759103A CN200710175910A CN101415233B CN 101415233 B CN101415233 B CN 101415233B CN 2007101759103 A CN2007101759103 A CN 2007101759103A CN 200710175910 A CN200710175910 A CN 200710175910A CN 101415233 B CN101415233 B CN 101415233B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000011664 signaling Effects 0.000 claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims description 36
- 238000013468 resource allocation Methods 0.000 claims description 26
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000002699 waste material Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
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- 230000007774 longterm Effects 0.000 description 2
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Abstract
The invention provides a method for allocating resources and a device thereof, wherein, the method comprises the following steps: a service subframe (TS0) and a downlink pilot time slot (UpPTS) sub-frame are merged as a new subframe, in the frequency resources occupied by a primary synchronization channel (P-SCH), the time frequency resources occupied by one orthogonal frequency division multiplexing (OFDM) symbol in the new subframe are allocated to the P-SCH, and the other time frequency resources apart from the time frequency resources allocated to the P-SCH in the new subframe are used for transmitting service data or/and control signaling. In the DwPTS, the other time frequency resources apart from the time frequency resources corresponding to frequency bands occupied by the P-SCH can be used for transmitting the service data or/and the control signaling instead of resulting in resource waste owing to being in an idle state all the time, thus further saving the time frequency resources.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of method and apparatus of resource allocation.
Background technology
TD SDMA (TD-SCDMA) is the technology of unique employing time division duplex (TDD) mode in three kinds of big international standards of 3-G (Generation Three mobile communication system), the TD-SCDMA system supports the transmission of up-downgoing non-symmetrical service, has bigger flexibility on frequency spectrum.In order to keep the long-term competitiveness of TD-SCDMA system, the TD-SCDMA system needs continuous evolution and raising ability equally.In the Long Term Evolution scheme (LTE TDD) of TD-SCDMA system, first-selected wireless frame structure is the second class wireless frame structure with the TD-SCDMA system compatible.
Fig. 1 is the second class wireless frame structure figure of the prior art, and as shown in Figure 1, wireless frame length is 10ms, and this radio frames is divided into the radio half frame of 2 5ms.Each radio half frame is made up of 7 service subframe and 3 special subframes.The label of described 7 service subframe is TS0 to TS7, and wherein, first service subframe TS0 is fixed for downlink transfer, and second service subframe TS1 is fixed for uplink.Three special subframes are respectively descending pilot frequency subframe (DwPTS), protection subframe (GP) and ascending pilot frequency subframe (UpPTS).Wherein, the time-frequency resource allocating of DwPTS is used to transmit down-bound pilot frequency signal for primary synchronization channel (P-SCH), and the time-frequency resource allocating of UpPTS is given uplink random access channel (PRACH), is used to transmit uplink pilot signal.Usually, the up-downgoing switching point is between service subframe TS3 and TS4, and TS1 to TS3 is the uplink service subframe, and TS4 to TS6 is the downlink business subframe.
In the second class radio frames of above-mentioned prior art, as shown in Figure 2, when utilizing DwPTS transmission down-bound pilot frequency signal, the shared running time-frequency resource of frequency range that only takies the 1.25MHz among this DwPTS transmits down-bound pilot frequency signal, the shared running time-frequency resource of other frequency resource in DwPTS except this 1.25MHz frequency range does not carry out the transmission of any data, be in idle condition always, this obviously can cause certain wasting of resources, particularly when the system bandwidth broad, this wasting of resources is particularly evident.
Summary of the invention
The embodiment of the invention provides a kind of method of allocating resources and device, so that save running time-frequency resource.
A kind of method of resource allocation, this method comprises:
Service subframe TS0 and descending pilot frequency subframe DwPTS are merged as a new subframe, the shared time-frequency resource allocating of an orthogonal frequency division multiplex OFDM symbol in the shared frequency resource of primary synchronization channel P-SCH in the subframe that this is new is given P-SCH, distributes that other running time-frequency resource except distributing to P-SCH is used for service data transmission or/and the control signaling in this new subframe.
The TTI of described new subframe correspondence is the time span of 10 OFDM symbols.
An OFDM symbol in the described new subframe is: first OFDM symbol or last OFDM symbol in the described new subframe.
This method also comprises:
The base station sends down-bound pilot frequency signal distributing on the running time-frequency resource of P-SCH, and service data transmission is or/and the control signaling on other running time-frequency resource in described new subframe except distributing to P-SCH.
This method also comprises:
User terminal UE obtains down-bound pilot frequency signal distributing on the running time-frequency resource of P-SCH, obtains business datum or/and the control signaling on other running time-frequency resource in described new subframe except distributing to P-SCH.
The shared time-frequency resource allocating of an OFDM symbol in the shared frequency resource of P-SCH in the subframe that this is new also comprises before giving P-SCH:
Judge whether that according to data transmission situation needs send the descending pilot frequency data, send the descending pilot frequency data if desired, then continue to carry out the step of the shared time-frequency resource allocating of a described OFDM symbol in the shared frequency resource of P-SCH in will this new subframe to P-SCH; If do not need to send the descending pilot frequency data, then distribute all shared running time-frequency resources of this new subframe to be used for service data transmission or/and control signaling, and do not send down-bound pilot frequency signal by this new subframe of broadcast channel notice UE.
This method also comprises: UE receives after described this new subframe do not send the notice of down-bound pilot frequency signal, obtains business datum or/and the control signaling on all running time-frequency resources of described new subframe.
A kind of base station, this base station comprises: P-SCH resource allocation unit and traffic resource assignment unit;
The P-SCH resource allocation unit is used in the shared frequency resource of P-SCH, gives P-SCH with the shared time-frequency resource allocating of an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation;
The traffic resource assignment unit is used for merging the new subframe that the back forms at service subframe TS0 and DwPTS, distributes other running time-frequency resource the running time-frequency resource that distributes except described P-SCH resource allocation unit to be used for service data transmission or/and the control signaling.
This base station also comprises: judging unit, be used for data transmission situation according to the base station at self place, judge whether to need to send the descending pilot frequency data, send the descending pilot frequency data if desired, then send and distribute notice to described P-SCH resource allocation unit, if do not need to send the descending pilot frequency data, then send and do not distribute notice to described P-SCH resource allocation unit;
Described P-SCH resource allocation unit, also be used for after receiving the distribution notice of described judging unit, carry out described in the shared frequency resource of P-SCH, the time-frequency resource allocating that an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation is shared is to the operation of P-SCH, receive described judging unit do not distribute notice after, be not that P-SCH distributes running time-frequency resource.
This base station also comprises: notification unit, be used for when described judgment unit judges does not need to send down-bound pilot frequency signal, and send the notice that this new subframe does not send down-bound pilot frequency signal by broadcast channel to UE.
This base station also comprises: pilot tone transmitting element and service transmitting unit;
The pilot tone transmitting element is used for sending down-bound pilot frequency signal on the running time-frequency resource that described P-SCH resource allocation unit distributes;
Service transmitting unit sends business datum on the running time-frequency resource that is used for distributing in described traffic resource assignment unit or/and the control signaling.
This UE comprises: pilot signal acquiring unit and professional acquiring unit;
The pilot signal acquiring unit is used in the shared frequency resource of P-SCH, obtains the down-bound pilot frequency signal that the base station sends in the running time-frequency resource that an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation is shared;
Professional acquiring unit is used for obtaining the business datum of base station transmission or/and the control signaling in new subframe other running time-frequency resource except distributing to P-SCH with service subframe TS0 and DwPTS merging back formation.
This UE also comprises: the notice acquiring unit is used for sending not exercise notice to described pilot signal acquiring unit after the new subframe that gets access to the base station transmission or not the notice of down-bound pilot frequency signal, and all obtains notice to professional acquiring unit transmission;
Described pilot signal acquiring unit also is used for not carrying out described operation of obtaining down-bound pilot frequency signal behind the not exercise notice that receives described notice acquiring unit transmission;
Described professional acquiring unit, also be used for receive that described notice acquiring unit sends whole obtain notice after, from whole running time-frequency resources that described new subframe takies, obtain business datum or/and the control signaling.
As can be seen from the above technical solutions, the method and apparatus that the embodiment of the invention provides, by service subframe TS0 and DwPTS are merged as a new subframe, in the shared frequency resource of P-SCH, the shared time-frequency resource allocating of an OFDM symbol in the subframe that this is new is given P-SCH, and other running time-frequency resource in the subframe that this is new except distributing to P-SCH is used for service data transmission or/and the control signaling.Make in DwPTS, other running time-frequency resource except P-SCH takies the running time-frequency resource of frequency range correspondence also can be used for service data transmission or/and the control signaling, and do not cause the wasting of resources, thereby saved running time-frequency resource more because be in idle condition always.
Description of drawings
Fig. 1 is the second class wireless frame structure figure of the prior art;
Fig. 2 is the situation that the takies schematic diagram of DwPTS running time-frequency resource in the prior art;
A kind of resource allocation schematic diagram that Fig. 3 a provides for the embodiment of the invention;
The another kind of resource allocation schematic diagram that Fig. 3 b provides for the embodiment of the invention;
The composition structure chart of the base station that Fig. 4 provides for the embodiment of the invention;
The structure chart of the UE that Fig. 5 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The method that the embodiment of the invention provides mainly comprises: service subframe TS0 and DwPTS are merged as a new subframe, in the shared frequency resource of P-SCH, the shared time-frequency resource allocating of an OFDM symbol in the subframe that this is new is given P-SCH, and other running time-frequency resource in the subframe that this is new except distributing to P-SCH is used for service data transmission or/and the control signaling.
In the method, service subframe TS0 and DwPTS in original second class frame structure are merged, the TTI length of original service subframe TS0 is 9 OFDMs (OFDM) symbols, length is 0.675ms, the TTI length that merges the new subframe of back formation is 10 OFDM symbols, and length is 758.33ms.
First OFDM symbol that to distribute to an OFDM symbol that P-SCH is used for sending down-bound pilot frequency signal can be this new subframe is shown in Fig. 3 a; Also can be last the OFDM symbol in this new subframe, shown in Fig. 3 b.In the shared frequency resource of P-SCH, shared time-frequency resource allocating is used to send down-bound pilot frequency signal to P-SCH in this OFDM symbol, and other running time-frequency resource in this new subframe all can be used for sending business datum or/and the control signaling.The unit of each Physical Resource Block (PRB) in distributing to the running time-frequency resource of P-SCH is 12 subcarrier * 1 OFDM symbol, be used to send business datum or/and the unit of each PRB of control signaling is 12 subcarrier * 9 OFDM symbol within the shared frequency range of P-SCH, be used to send business datum or/and the unit of each PRB of control signaling is 12 subcarrier * 10 OFDM symbol outside the shared frequency range of P-SCH.Correspondingly, when adopting the method for salary distribution shown in Fig. 3 a, user terminal (UE) is in the shared frequency resource of P-SCH, obtain down-bound pilot frequency signal in the 1st running time-frequency resource that the OFDM symbol is shared in the new subframe, the downlink service data that obtains the base station transmission in other running time-frequency resource in this new subframe is or/and the control signaling.When adopting the method for salary distribution shown in Fig. 3 b, UE is in the shared frequency resource of P-SCH, obtain down-bound pilot frequency signal in the shared running time-frequency resource of last 1 OFDM symbol in the new subframe, obtain downlink service data that the base station sends in other running time-frequency resource in this new subframe or/and the control signaling.
In addition, in the shared frequency resource of P-SCH, the shared time-frequency resource allocating of an OFDM symbol in the subframe that this is new is given before the P-SCH, the base station can send situation according to this self data, judge whether to need to send the descending pilot frequency data, send the descending pilot frequency data if desired, then in the shared frequency resource of P-SCH, the shared time-frequency resource allocating of an OFDM symbol in the subframe that this is new is given P-SCH; If do not need the descending pilot frequency data that send, then distribute all shared running time-frequency resources of this new subframe to be used for service data transmission or/and the control signaling.And do not send down-bound pilot frequency signal by this new subframe of broadcast channel notice UE.After the UE of this moment obtained this notice, the business datum of obtaining the base station transmission from whole running time-frequency resources of this new service subframe was or/and the control signaling.
The composition structure chart of the base station that Fig. 4 provides for the embodiment of the invention, as shown in Figure 4, this base station can comprise: P-SCH resource allocation unit 401 and traffic resource assignment unit 402.
P-SCH resource allocation unit 401 is used in the shared frequency resource of P-SCH, gives P-SCH with the shared time-frequency resource allocating of an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation.
Traffic resource assignment unit 402 is used for new subframe other running time-frequency resource except distributing to P-SCH of service subframe TS0 and DwPTS merging back formation is used for service data transmission or/and the control signaling.
This base station can also comprise: judging unit 403, be used for sending situation according to the data of self base station, place, judge whether to need to send the descending pilot frequency data, send the descending pilot frequency data if desired, then send and distribute notice to P-SCH resource allocation unit 401, if do not need to send the descending pilot frequency data, then send and do not distribute notice to P-SCH resource allocation unit 401.
P-SCH resource allocation unit 401 also is used for carrying out the operation that described distribution running time-frequency resource is given P-SCH after receiving the distribution notice of judging unit 403, receive judging unit 403 do not distribute notice after, be described P-SCH distribution running time-frequency resource.
At this moment, traffic resource assignment unit 402 just distributes all running time-frequency resources in the new subframe to be used to send business datum.
This base station can also comprise: notification unit 404 is used for sending the notice that this new subframe does not send down-bound pilot frequency signal by broadcast channel to UE when judging unit 403 judgements do not need to send down-bound pilot frequency signal.
This base station can also comprise: pilot tone transmitting element 405 and service transmitting unit 406.
Pilot tone transmitting element 405 is used for sending down-bound pilot frequency signal on the running time-frequency resource that P-SCH resource allocation unit 401 distributes.
The structure chart of the UE that Fig. 5 provides for the embodiment of the invention, as shown in Figure 5, this UE can comprise: pilot signal acquiring unit 501 and professional acquiring unit 502.
Pilot signal acquiring unit 501 is used in the shared frequency resource of P-SCH, obtains the down-bound pilot frequency signal that the base station sends in the running time-frequency resource that an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation is shared.
Professional acquiring unit 502 is used for obtaining the business datum of base station transmission or/and the control signaling in new subframe other running time-frequency resource except distributing to P-SCH with service subframe TS0 and DwPTS merging back formation.
This UE can also comprise: notice acquiring unit 503, be used for after the new subframe that gets access to the base station transmission or not the notice of down-bound pilot frequency signal, send not exercise notice to pilot tone signal acquiring unit 501, and all obtain notice to professional acquiring unit 502 transmissions.
Pilot signal acquiring unit 501 also is used for not carrying out described operation of obtaining down-bound pilot frequency signal behind the not exercise notice that receives 503 transmissions of notice acquiring unit.
Professional acquiring unit 502, also be used for receive that notice acquiring unit 503 sends whole obtain notice after, from whole running time-frequency resources that this new subframe takies, obtain business datum or/and the control signaling.
By above description as can be seen, the method and apparatus that the embodiment of the invention provides, by service subframe TS0 and DwPTS are merged as a new subframe, in the shared frequency resource of P-SCH, the shared time-frequency resource allocating of an OFDM symbol in the subframe that this is new is given P-SCH, and other running time-frequency resource in the subframe that this is new except distributing to P-SCH is used for service data transmission or/and the control signaling.Make in DwPTS, other running time-frequency resource except that the running time-frequency resource of the shared frequency range correspondence of P-SCH also can be used for service data transmission or/and the control signaling, and do not cause the wasting of resources, thereby saved running time-frequency resource more because be in idle condition always.
The embodiment of the invention also provides a kind of judgment mechanism, makes to utilize the whole running time-frequency resources in this new subframe to send business datum under the situation that does not have down-bound pilot frequency signal to transmit, and has saved running time-frequency resource to a greater degree.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (13)
1. the method for a resource allocation is characterized in that, this method comprises:
Service subframe TS0 and descending pilot frequency subframe DwPTS are merged as a new subframe, the shared time-frequency resource allocating of an orthogonal frequency division multiplex OFDM symbol in the shared frequency resource of primary synchronization channel P-SCH in the subframe that this is new is given P-SCH, distributes that other running time-frequency resource except distributing to P-SCH is used for service data transmission or/and the control signaling in this new subframe.
2. method according to claim 1 is characterized in that, the TTI of described new subframe correspondence is the time span of 10 OFDM symbols.
3. method according to claim 1 is characterized in that, an OFDM symbol in the described new subframe is: first OFDM symbol or last OFDM symbol in the described new subframe.
4. method according to claim 1 is characterized in that, this method also comprises:
The base station sends down-bound pilot frequency signal distributing on the running time-frequency resource of P-SCH, and service data transmission is or/and the control signaling on other running time-frequency resource in described new subframe except distributing to P-SCH.
5. method according to claim 4 is characterized in that, this method also comprises:
User terminal UE obtains down-bound pilot frequency signal distributing on the running time-frequency resource of P-SCH, obtains business datum or/and the control signaling on other running time-frequency resource in described new subframe except distributing to P-SCH.
6. method according to claim 1 is characterized in that, the shared time-frequency resource allocating of the OFDM symbol in the shared frequency resource of P-SCH in the subframe that this is new also comprises before giving P-SCH:
Judge whether that according to data transmission situation needs send the descending pilot frequency data, send the descending pilot frequency data if desired, then continue to carry out the step of the shared time-frequency resource allocating of a described OFDM symbol in the shared frequency resource of P-SCH in will this new subframe to P-SCH; If do not need to send the descending pilot frequency data, then distribute all shared running time-frequency resources of this new subframe to be used for service data transmission or/and control signaling, and do not send down-bound pilot frequency signal by this new subframe of broadcast channel notice UE.
7. method according to claim 6 is characterized in that, this method also comprises: UE receives after described this new subframe do not send the notice of down-bound pilot frequency signal, obtains business datum or/and the control signaling on all running time-frequency resources of described new subframe.
8. a base station is characterized in that, this base station comprises: P-SCH resource allocation unit and traffic resource assignment unit;
The P-SCH resource allocation unit is used in the shared frequency resource of P-SCH, gives P-SCH with the shared time-frequency resource allocating of an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation;
The traffic resource assignment unit is used for merging the new subframe that the back forms at service subframe TS0 and DwPTS, distributes other running time-frequency resource the running time-frequency resource that distributes except described P-SCH resource allocation unit to be used for service data transmission or/and the control signaling.
9. base station according to claim 8, it is characterized in that, this base station also comprises: judging unit, be used for data transmission situation according to the base station at self place, judging whether needs to send the descending pilot frequency data, sends the descending pilot frequency data if desired, then sends to described P-SCH resource allocation unit and distributes notice, if do not need to send the descending pilot frequency data, then send and do not distribute notice to described P-SCH resource allocation unit;
Described P-SCH resource allocation unit, also be used for after receiving the distribution notice of described judging unit, carry out described in the shared frequency resource of P-SCH, the time-frequency resource allocating that an OFDM symbol in the new subframe of service subframe TS0 and DwPTS merging back formation is shared is to the operation of P-SCH, receive described judging unit do not distribute notice after, be not that P-SCH distributes running time-frequency resource.
10. base station according to claim 9, it is characterized in that, this base station also comprises: notification unit, be used for when described judgment unit judges does not need to send down-bound pilot frequency signal, and send the notice that this new subframe does not send down-bound pilot frequency signal by broadcast channel to UE.
11. base station according to claim 8 is characterized in that, this base station also comprises: pilot tone transmitting element and service transmitting unit;
The pilot tone transmitting element is used for sending down-bound pilot frequency signal on the running time-frequency resource that described P-SCH resource allocation unit distributes;
Service transmitting unit sends business datum on the running time-frequency resource that is used for distributing in described traffic resource assignment unit or/and the control signaling.
12. a user terminal UE is characterized in that, this UE comprises: pilot signal acquiring unit and professional acquiring unit;
The pilot signal acquiring unit is used in the shared frequency resource of P-SCH, obtains the down-bound pilot frequency signal that the base station sends in the running time-frequency resource that an OFDM symbol in the new subframe of service subframe TSO and DwPTS merging back formation is shared;
Professional acquiring unit is used for obtaining the business datum of base station transmission or/and the control signaling in new subframe other running time-frequency resource except distributing to P-SCH with service subframe TS0 and DwPTS merging back formation.
13. UE according to claim 12, it is characterized in that, this UE also comprises: the notice acquiring unit, be used for after the new subframe that gets access to the base station transmission or not the notice of down-bound pilot frequency signal, send not exercise notice to described pilot signal acquiring unit, and all obtain notice to professional acquiring unit transmission;
Described pilot signal acquiring unit also is used for not carrying out described operation of obtaining down-bound pilot frequency signal behind the not exercise notice that receives described notice acquiring unit transmission;
Described professional acquiring unit, also be used for receive that described notice acquiring unit sends whole obtain notice after, from whole running time-frequency resources that described new subframe takies, obtain business datum or/and the control signaling.
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| CN2007101759103A CN101415233B (en) | 2007-10-15 | 2007-10-15 | Method and apparatus for resource distribution |
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| CN2007101759103A CN101415233B (en) | 2007-10-15 | 2007-10-15 | Method and apparatus for resource distribution |
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| CN102685890B (en) | 2011-03-08 | 2017-11-14 | 中兴通讯股份有限公司 | The sending method and system of a kind of pilot tone |
| WO2013107045A1 (en) * | 2012-01-20 | 2013-07-25 | 富士通株式会社 | Resource distribution method, and searching method and device therefor |
| WO2016045037A1 (en) * | 2014-09-25 | 2016-03-31 | 华为技术有限公司 | Signal sending method, signal receiving method and relevant device therefor |
| CN105871526A (en) * | 2015-01-20 | 2016-08-17 | 中兴通讯股份有限公司 | Channel occupancy method and channel occupancy system |
| CN108353394A (en) * | 2015-11-06 | 2018-07-31 | 联发科技（新加坡）私人有限公司 | Data transferring method |
| CN106961743A (en) * | 2016-01-11 | 2017-07-18 | 中兴通讯股份有限公司 | A kind of transmission method, device and access network elements, user equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
| CN101035371A (en) * | 2007-03-28 | 2007-09-12 | 中兴通讯股份有限公司 | Transmission method of synchronization signal of time-division duplex system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009513A (en) * | 2006-01-26 | 2007-08-01 | 上海原动力通信科技有限公司 | Cell synchronization method and initial cell searching method for broadband time-division dual-duplex cellular system |
| CN101035371A (en) * | 2007-03-28 | 2007-09-12 | 中兴通讯股份有限公司 | Transmission method of synchronization signal of time-division duplex system |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210602 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |