CN101577579B - Method and base station for carrying out frequency hopping diversity-wave bound type transmission - Google Patents
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Abstract
The invention provides a method and a base station for carrying out frequency hopping diversity-wave bound type transmission. The method comprises the following steps: in part of the frequency sections of a system bandwidth, a user special reference mark is mapped in a unit 0 in a physical resource block (PRB), and the area except an area occupied by a physical downlink control channel (PDCCH) in the unit 0 is set as a user resource mapping area; in the rest part of the frequency sections of the system bandwidth, the user special reference mark is mapped in a unit 1 in the PRB, and the unit 1 is set as the user resource mapping area, wherein the unit 0 comprises first five orthogonal frequency division multiplexing (OFDM) marks in the PRB, the unit 1 comprises the sixth OFDM mark to the Lth OFDM mark in the PRB, and L is the amount of OFDM marks collocated for a downlink pilot time slot(DwPTS); and the mapping mode is adopted to carry out the frequency hopping diversity-wave bound typetransmission in the DwPTS. The method and the base station provided by the invention can improve the detection performance of a system.
Description
Technical field
The present invention relates to the LTE technical field, particularly a kind of method and base station of carrying out the frequency hopping diversity-wave bound type transmission.
Background technology
Long Term Evolution (LTE) system supports Frequency Division Duplexing (FDD) (FDD) and two kinds of dual-modes of time division duplex (TDD), and two kinds of dual-modes use different frame structures.Wherein, Equations of The Second Kind frame structure (FS2) is only applicable to LTE TDD system.Referring to Fig. 1, Fig. 1 is that in prior art, the uplink and downlink switching cycle is Equations of The Second Kind frame structure schematic diagram in the system of 5ms.Each radio frames is made of the long field (half-frame) of two 5ms.
It is the system of 5ms for the uplink and downlink switching cycle; each field comprises subframe (subframe) and 3 special time slots (special slot) that 4 1ms are long: descending pilot frequency time slot (DwPTS; DownlinkPilot Time Slot), protection interval (GP; Guard Period) and uplink pilot time slot (UpPTS; UplinkPilot Time Slot), the overall length of these 3 special time slots is 1ms.
Be the system of 10ms for the uplink and downlink switching cycle, first field comprises subframe that 4 1ms are long and 3 special time slot: DwPTS, GP and UpPTS; Second field only has the long subframe of 5 1ms.
Wherein, the length of special time slot is configurable, and DwPTS is reserved as downlink transfer forever.Referring to Fig. 2, Fig. 2 is the structural representation of DwPTS time slot in prior art.Front 1～2 OFDM symbol in the DwPTS time slot is Physical Downlink Control Channel (PDCCH) Free Region, is used for transmitting downlink control signal; 72 central subcarriers on its 3rd OFDM symbol always are used for transmission for the master sync signal that carries out cell initial search (cell serach).Except Physical Broadcast Channel (PBCH), the idling-resource that any downlink business all can take on this time slot transmits, as physical down shared service channel (PDSCH), Physical Broadcast Channel (PMCH) etc.
Table 1 is the configuring condition list of special time slot.Table 1 has provided the various configuring conditions of DwPTS, and in regular circulation prefix (CP) subframe, 1 OFDM symbol lengths is 2192Ts, comprises altogether 14 OFDM symbols in whole subframe; In expansion CP subframe, the length of 1 OFDM symbol is 2560Ts, comprises altogether 12 OFDM symbols in whole subframe.Can find out, for conventional CP subframe, DwPTS may take 3,9,10,11 or 12 OFDM symbols; In expansion CP subframe, DwPTS may take 3,8,9 or 10 OFDM symbols.For any subframe, if DwPTS only takies 3 OFDM symbols, do not transmit other downlink business in this time slot; When DwPTS takies more than 3 OFDM symbols, can utilize idling-resource to transmit other downlink business.
Table 1
The support of LTE system advances to have more (MIMO) technology more, as beam shaping (BF) technology.Transmission has following regulation for the downlink wave beam excipient in the LTE system:
Beam shaping user user dedicated reference symbols (UE-specific reference signals) demodulation PDSCH;
User dedicated reference symbols only is mapped in excipient and transmits in the Resource Block that uses;
User dedicated reference symbols only takies an antenna port (being antenna port 5) and shines upon;
High level needs notification terminal whether to use user dedicated reference symbols (namely whether carrying out beamforming transmission);
When carrying out beamforming transmission, the residential quarter dedicated reference symbols on reserved port 0,1 (Cell-specificreference signals), the residential quarter dedicated reference symbols on port 2,3 is no longer available;
Support the downstream signal transmission of two kinds of frequency diversity degree, that is: the frequency hopping transmission take time slot as unit of Nd=1 centralized (Localized) transmission and Nd=2, and during localized transmission, channel estimating is carried out on a subframe, and frequency hopping when transmission channel estimating is carried out on a frequency hopping unit.
Wherein, above-mentioned residential quarter dedicated reference symbols transmits in each descending sub frame, covers the whole system bandwidth on frequency domain, in time across whole descending sub frame; User dedicated reference symbols only transmits in the data division in distributing to the user and carry out the Physical Resource Block (PRB) of beam shaping.When user dedicated reference symbols and residential quarter dedicated reference symbols exist in same subframe, both adopt certain mode to carry out multiplexing, as shown in Fig. 3 A and Fig. 3 B.
Referring to Fig. 3 A, Fig. 3 A is the frequency hopping when transmission user dedicated reference symbols mapping structure schematic diagram that is applicable to conventional CP subframe.In conventional CP subframe, a subframe comprises 14 OFDM symbols.In Fig. 3 A, netted little lattice represent residential quarter dedicated reference symbols, R
51Expression user's 1 dedicated reference symbols, R
52The user (be referred to as user 2) of expression except user 1 dedicated reference symbols.In the band segment of system bandwidth, user 1 dedicated reference symbols is mapped in first time slot (Slot 0) in PRB; In other band segments of system bandwidth, user 1 dedicated reference symbols is mapped in second time slot (Slot 1) in PRB.In different frequency, the position of user dedicated reference symbols mapping is different, realizes timeslot-based frequency hopping.
Referring to Fig. 3 B, Fig. 3 B is user dedicated reference symbols mapping structure schematic diagram when being applicable to expand the frequency hopping transmission of CP subframe.In expansion CP subframe, a subframe comprises 12 OFDM symbols.In Fig. 3 B, netted little lattice represent residential quarter dedicated reference symbols, R
51Expression user's 1 dedicated reference symbols, R
52The user (be referred to as user 2) of expression except user 1 dedicated reference symbols.In the band segment of system bandwidth, user 1 dedicated reference symbols is mapped in first time slot (Slot 0) in PRB; In other band segments of system bandwidth, user 1 dedicated reference symbols is mapped in second time slot (Slot 1) in PRB.In different frequency, the position of user dedicated reference symbols mapping is different, realizes timeslot-based frequency hopping.
There are following two defectives in the method for above-mentioned frequency hopping transmission take time slot as unit: (1) is for conventional CP subframe, when 9 OFDM symbols of DwPTS configuration, owing to there is no user dedicated reference symbols in Slot 1, make to adopt user dedicated reference symbols to carry out channel estimating this moment, just normally demodulation of the data in Slot 1.(2) for the situation of user dedicated reference symbols is arranged in two Slot, also exist the problem of reference symbol irrational distribution, cause on former and later two time slots performance difference larger.Above-mentioned two defectives all can affect the detection performance of system.
Summary of the invention
The embodiment of the present invention proposes a kind of method of carrying out the frequency hopping diversity-wave bound type transmission, and the method can improve the detection performance of system.
The embodiment of the present invention also proposes a kind of base station, can improve the detection performance of system.
Technical scheme of the present invention is achieved in that
A kind of method of carrying out the frequency hopping diversity-wave bound type transmission comprises:
In the band segment of system bandwidth, shine upon in the unit 0 of user dedicated reference symbols in Physical Resource Block (PRB), will be described user's resource mapping zone except the region division the PDCCH occupied area in described unit 0; In the remainder frequency range of system bandwidth, shine upon in the unit 1 with user dedicated reference symbols in PRB, described unit 1 is set to described user's resource mapping zone; Wherein, described unit 0 comprises front 5 the OFDM symbols in PRB, and unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol that configures in a DwPTS;
Adopt above-mentioned mapping mode to carry out the frequency hopping diversity-wave bound type transmission in DwPTS.
A kind of base station comprises:
Mapping block, be used for the band segment in system bandwidth, shining upon in the unit 0 of user dedicated reference symbols in Physical Resource Block (PRB), will be described user's resource mapping zone except the region division the PDCCH occupied area in described unit 0; In the remainder frequency range of system bandwidth, shine upon in the unit 1 with user dedicated reference symbols in PRB, described unit 1 is set to described user's resource mapping zone; Wherein, described unit 0 comprises front 5 the OFDM symbols in PRB, and unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol of configuration in a descending pilot frequency time slot (DwPTS);
Transport module is used for adopting the structure after described mapping block shines upon to carry out the frequency hopping diversity-wave bound type transmission at DwPTS.
As seen, method and base station that the embodiment of the present invention proposes, by adjusting hopping structure, adopt the frequency hopping unit (being unit 1 and unit 2) of length-specific to carry out the frequency hopping transmission at DwPTS, make the DwPTS time slot for arbitrary disposition, in each frequency hopping unit, user dedicated reference symbols is arranged, thereby can adopt user dedicated reference symbols to carry out channel estimating in each frequency hopping unit, improved the detection performance of system.
Description of drawings
Fig. 1 is that in prior art, the uplink and downlink switching cycle is Equations of The Second Kind frame structure schematic diagram in the system of 5ms;
Fig. 2 is the structural representation of DwPTS time slot in prior art;
Fig. 3 A is the frequency hopping when transmission user dedicated reference symbols mapping structure schematic diagram that is applicable to conventional CP subframe;
Fig. 3 B is user dedicated reference symbols mapping structure schematic diagram when being applicable to expand the frequency hopping transmission of CP subframe;
Fig. 4 A is for being applicable to conventional CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 12 OFDM symbols is transmitted;
Fig. 4 B is for being applicable to conventional CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 11 OFDM symbols is transmitted;
Fig. 4 C is for being applicable to conventional CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 10 OFDM symbols is transmitted;
Fig. 4 D is for being applicable to conventional CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 9 OFDM symbols is transmitted;
Fig. 5 A is for being applicable to expand the CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 10 OFDM symbols is transmitted;
Fig. 5 B is for being applicable to expand the CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 9 OFDM symbols is transmitted;
Fig. 5 C is for being applicable to expand the CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 8 OFDM symbols is transmitted.
Embodiment
The embodiment of the present invention considers the problems such as implementation complexity and systematic function, proposes a kind of new hopping structure scheme, carries out beamforming transmission for the DwPTS time slot that is supported in various configurations.Its characteristics are:
When (1) carrying out beam shaping in DwPTS, can adopt existing user dedicated reference symbols mapping structure, but the unit (Unit) that is based on length-specific carries out the frequency hopping transmission of Nd=2.Wherein, a PRB comprises 2 Unit, i.e. Unit 0 and Unit 1.
(2) (for conventional CP subframe, L can be 3,9,10,11 or 12 to be illustrated in the number of the OFDM symbol that configures in a DwPTS with L; For expansion CP subframe, L can be 3,8,9 or 10.)
When L=3, owing to transmitting without PDSCH in DwPTS, need not to support frequency hopping, therefore the hopping scheme that the embodiment of the present invention proposes does not comprise this kind situation.
When L ≠ 3, the length of Unit 0 is fixed as 5, namely comprises front 5 OFDM symbols in Unit 0.
(3) length of Unit 1 is relevant with the concrete configuration of DwPTS, comprises the 6th to L OFDM symbol in Unit 1.
Below introduce in detail the frequency hopping under different situations:
(1) be applicable to the user dedicated reference symbols mapping of conventional CP subframe.As shown in Fig. 4 A to 4D, Fig. 4 A to Fig. 4 D is respectively and is applicable to conventional CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 12,11,10 or 9 OFDM symbols is transmitted.
In Fig. 4 A to Fig. 4 D, all take 2 OFDM symbols take PDCCH and give an example as example, in other embodiments of the invention, PDCCH can also take 2 OFDM symbols.In Fig. 4 A to Fig. 4 D, netted little lattice represent residential quarter dedicated reference symbols, R
51Expression user's 1 dedicated reference symbols, R
52The user (be referred to as user 2) of expression except user 1 dedicated reference symbols.
In Fig. 4 A, DwPTS disposes 12 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 7, comprises the 6th to the 12nd OFDM symbol.
For user 1, in the band segment of system bandwidth, shine upon in the Unit 0 of dedicated reference symbols in PRB with user 1, will be set to user 1 resource mapping zone in Unit 0 except the zone the PDCCH occupied area (being rear 3 the OFDM symbols in Unit 0 in the present embodiment);
In the remainder frequency range of system bandwidth, shine upon in the Unit1 of dedicated reference symbols in PRB with user 1, Unit 1 is set to user 1 resource mapping zone.
In Fig. 4 B, DwPTS disposes 11 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 6, comprises the 6th to the 11st OFDM symbol.
In Fig. 4 C, DwPTS disposes 10 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 5, comprises the 6th to the 10th OFDM symbol.
In Fig. 4 D, DwPTS disposes 9 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 4, comprises the 6th to the 9th OFDM symbol.
In Fig. 4 B to Fig. 4 D, similar in the mapping mode of user dedicated reference symbols and Fig. 4 A do not repeat them here.
Receiving terminal carries out respectively channel estimating on each Unit, by Fig. 4 A to Fig. 4 D as seen, owing in Unit0 and Unit 1, user dedicated reference symbols being arranged, so the normally demodulation of data in Unit 0 and Unit 1, thereby improve the detection performance of system.
(2) be applicable to expand the user dedicated reference symbols mapping of CP subframe.As shown in Fig. 5 A to 5C, Fig. 5 A to Fig. 5 C is respectively and is applicable to expand the CP subframe, user dedicated reference symbols mapping structure schematic diagram when the frequency hopping when DwPTS disposes 10,9 or 8 OFDM symbols is transmitted.
In Fig. 5 A to Fig. 5 C, all take 2 OFDM symbols take PDCCH and give an example as example, in other embodiments of the invention, PDCCH can also take 2 OFDM symbols.In Fig. 5 A to Fig. 5 C, netted little lattice represent residential quarter dedicated reference symbols, R
51Expression user's 1 dedicated reference symbols, R
52The user (be referred to as user 2) of expression except user 1 dedicated reference symbols.
In Fig. 5 A, DwPTS disposes 10 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 5, comprises the 6th to the 10th OFDM symbol.
For user 1, in the band segment of system bandwidth, shine upon in the Unit 0 of dedicated reference symbols in PRB with user 1, will be set to user 1 resource mapping zone in Unit 0 except the zone the PDCCH occupied area (being rear 3 the OFDM symbols in Unit 0 in the present embodiment);
In the remainder frequency range of system bandwidth, shine upon in the Unit1 of dedicated reference symbols in PRB with user 1, Unit 1 is set to user 1 resource mapping zone.
In Fig. 5 B, DwPTS disposes 9 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 4, comprises the 6th to the 9th OFDM symbol.
In Fig. 5 C, DwPTS disposes 8 OFDM symbols, comprises 2 Unit in a PRB, i.e. Unit 0 and Unit 1.Wherein, the length of Unit 0 is 5, namely comprises front 5 OFDM symbols; The length of Unit 1 is 3, comprises the 6th to the 8th OFDM symbol.
In Fig. 5 B and Fig. 5 C, similar in the mapping mode of user dedicated reference symbols and Fig. 5 A do not repeat them here.
Receiving terminal carries out respectively channel estimating on each Unit, by Fig. 5 A to Fig. 5 C as seen, owing in Unit0 and Unit 1, user dedicated reference symbols being arranged, so the normally demodulation of data in Unit 0 and Unit 1, thereby improve the detection performance of system.
Based on above-mentioned hopping scheme, the embodiment of the present invention proposes a kind of method of carrying out the frequency hopping diversity-wave bound type transmission, comprising:
In the band segment of system bandwidth, shine upon in the Unit 0 with user dedicated reference symbols in PRB, will be described user's resource mapping zone except the region division the PDCCH occupied area in described Unit 0; In the remainder frequency range of system bandwidth, shine upon in the Unit 1 with user dedicated reference symbols in PRB, described Unit 1 is set to described user's resource mapping zone; Wherein, described Unit 0 comprises front 5 the OFDM symbols in PRB, and Unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol that configures in a DwPTS;
Adopt above-mentioned mapping mode to carry out the frequency hopping diversity-wave bound type transmission in DwPTS.
Said method is applicable to conventional CP subframe and expansion CP subframe system simultaneously.Wherein, when sub-frame formats was conventional CP subframe, described L can be 9,10,11 or 12; The mapping structure of user dedicated reference symbols in Unit 0 or Unit 1 is the user dedicated reference symbols mapping structure of conventional CP subframe in prior art.When sub-frame formats was expansion CP subframe, described L can be 8,9 or 10; The mapping structure of user dedicated reference symbols in Unit 0 or Unit 1 is the user dedicated reference symbols mapping structure of expansion CP subframe in prior art.
Said method can further include: receiving terminal carries out respectively channel estimating on Unit 0 and Unit 1.Owing to all comprising user dedicated reference symbols in Unit in the present invention 0 and Unit 1, so can both carry out channel estimating in Unit 0 and Unit 1, improved the detection performance of system.
In said method, described PDCCH occupied area can comprise 1 or 2 OFDM symbols.
The embodiment of the present invention also proposes a kind of base station, comprising:
Mapping block is used for the band segment in system bandwidth, shines upon in the Unit 0 with user dedicated reference symbols in thing PRB, and will be that described user's resource mapping is regional except the region division the PDCCH occupied area in described Unit 0; In the remainder frequency range of system bandwidth, shine upon in the Unit 1 with user dedicated reference symbols in PRB, described Unit 1 is set to described user's resource mapping zone; Wherein, described Unit 0 comprises front 5 the OFDM symbols in PRB, and Unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol that configures in a DwPTS;
Transport module is used for adopting the structure after described mapping block shines upon to carry out the frequency hopping diversity-wave bound type transmission at DwPTS.
As fully visible, method and the base station of carrying out the frequency hopping diversity-wave bound type transmission that the embodiment of the present invention proposes, use existing user dedicated reference symbols mapping structure, reselect specific frequency hopping unit, make the DwPTS time slot for arbitrary disposition, can guarantee that user dedicated reference symbols has rational distribution on each frequency hopping unit, receiving terminal carries out respectively channel estimating on each frequency hopping unit, thereby can improve the detection performance of system.
Claims (6)
1. a method of carrying out the frequency hopping diversity-wave bound type transmission, is characterized in that, described method comprises:
In the band segment of system bandwidth, shining upon in unit 0 with user dedicated reference symbols in Physical Resource Block PRB, will be described user's resource mapping zone except the region division the physical downlink control channel PDCCH occupied area in described unit 0; In the remainder frequency range of system bandwidth, shine upon in the unit 1 with user dedicated reference symbols in PRB, described unit 1 is set to described user's resource mapping zone; Wherein, described unit 0 comprises front 5 the orthogonal frequency division multiplex OFDM symbols in PRB, and unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol that configures in a descending pilot frequency time slot DwPTS;
Adopt above-mentioned mapping mode to carry out the frequency hopping diversity-wave bound type transmission in DwPTS.
2. method according to claim 1, is characterized in that, in described method, when sub-frame formats was regular circulation prefix CP subframe, described L was 9,10,11 or 12;
The mapping structure of described user dedicated reference symbols in unit 0 or unit 1 is the user dedicated reference symbols mapping structure of conventional CP subframe.
3. method according to claim 1, is characterized in that, in described method, when sub-frame formats was expansion CP subframe, described L was 8,9 or 10;
The mapping structure of described user dedicated reference symbols in unit 0 or unit 1 is the user dedicated reference symbols mapping structure of expansion CP subframe.
4. the described method of arbitrary claim according to claim 1 to 3, is characterized in that, described method further comprises: receiving terminal carries out respectively channel estimating on unit 0 and unit 1.
5. method according to claim 1, is characterized in that, described PDCCH occupied area comprises 1 or 2 OFDM symbols.
6. a base station, is characterized in that, described base station comprises:
Mapping block, be used for the band segment in system bandwidth, shining upon in the unit 0 of user dedicated reference symbols in Physical Resource Block (PRB), will be described user's resource mapping zone except the region division the PDCCH occupied area in described unit 0; In the remainder frequency range of system bandwidth, shine upon in the unit 1 with user dedicated reference symbols in PRB, described unit 1 is set to described user's resource mapping zone; Wherein, described unit 0 comprises front 5 the OFDM symbols in PRB, and unit 1 comprises the 6th in PRB to L OFDM symbol, and L is the number of the OFDM symbol of configuration in a descending pilot frequency time slot (DwPTS);
Transport module is used for adopting the structure after described mapping block shines upon to carry out the frequency hopping diversity-wave bound type transmission at DwPTS.
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| CN110050497B (en) * | 2016-11-04 | 2023-12-08 | Lg电子株式会社 | Method for downlink channel reception in wireless communication system and apparatus therefor |
| CN109863710A (en) * | 2017-09-30 | 2019-06-07 | 北京小米移动软件有限公司 | Method and device for transmitting downlink control information |
| EP4369816A4 (en) * | 2021-07-08 | 2024-09-25 | Beijing Xiaomi Mobile Software Co., Ltd. | FREQUENCY HOPPING METHOD AND APPARATUS, USER EQUIPMENT, BASE STATION AND STORAGE MEDIUM |
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| CN101039297A (en) * | 2006-03-17 | 2007-09-19 | 北京三星通信技术研究有限公司 | Method and system for mapping virtual resource block to physical resource block |
| CN101060389A (en) * | 2006-04-20 | 2007-10-24 | 大唐移动通信设备有限公司 | A TD-CDMA system performance optimization method |
| CN101110622A (en) * | 2006-07-21 | 2008-01-23 | 普天信息技术研究院 | A Beamforming Method for Forward Access Channel |
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| CN101039297A (en) * | 2006-03-17 | 2007-09-19 | 北京三星通信技术研究有限公司 | Method and system for mapping virtual resource block to physical resource block |
| CN101060389A (en) * | 2006-04-20 | 2007-10-24 | 大唐移动通信设备有限公司 | A TD-CDMA system performance optimization method |
| CN101110622A (en) * | 2006-07-21 | 2008-01-23 | 普天信息技术研究院 | A Beamforming Method for Forward Access Channel |
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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: 20210617 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 |
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