CN103248599B - A kind of physical resource mapping method of Physical Downlink Shared Channel and device - Google Patents
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Abstract
The invention provides physical resource mapping method and the device of a kind of Physical Downlink Shared Channel PSDCH, main contents are: each channel type that may map according to the descending sub frame in radio frames and/or special subframe and the difference of signal type, subframe is divided into multiple map type, when needing to determine the physical resource of the PDSCH wherein mapped for a certain subframe, can map type belonging to this subframe, determine the channel type that wherein can map and signal type, and then after the RE that outside removal PDSCH, other channels and signal take, remaining RE is the physical resource that PDSCH maps.Because the solution of the present invention is without the need to considering resource indicating mode, and can be applicable in the system of various different bandwidth, therefore, effectively can simplify and unify PDSCH resource mapping method, decrease the calculating duration for PDSCH resource mapping form, and then the seamless switching of different bandwidth environment can be completed fast.
Description
Technical field
The present invention relates to 3G (Third Generation) Moblie Partnership Program long-term technology evolution (ThirdGenerationPartnerPlanLongTermEvolution, 3GPPLTE) mobile communication technology field, particularly relate to a kind of physical resource mapping method and device of Physical Downlink Shared Channel (PhysicalDownlinkSharedChannel, PDSCH).
Background technology
In LTE mobile communication system, after precoding is carried out to PDSCH, need PDSCH mapped resource unit (ResourceElement, RE) on, described RE is by the OFDM (OrthogonalFrequencyDivisionMultiplexing of in time domain, OFDM) subcarrier on symbol and frequency domain is formed, because of Resource Block (ResourceBlock, RB) be the base unit of scheduling of resource of LTE system uplink/downlink physical channel, therefore described PDSCH is mapped on RE and also maps to by the RB that RE is formed by PDSCH, obtain representing PDSCH when certain bandwidth distribute the resource mapping form of RE resource, and then the resource mapping form be mapped to according to PDSCH on RB, determine the resource needed for PDSCH distributes.
Before resource mapping is carried out to PDSCH, it is its assignment logic Resource Block (VirtualResourceBlock that base station needs according to the resource indicating mode of PDSCH, VRB), and the VRB of described distribution is mapped to Physical Resource Block (PhysicalResourceBlock according to certain rule, and then determine the resource mapping form of PDSCH according to the mapping relations of VRB and PRB PRB).
According to 3GPP agreement regulation, the resource indicating mode of PDSCH has three kinds: type0, type1 and type2.The resource indicating mode of type2 is divided into again two kinds: the centralized resources method of salary distribution (being referred to as type2-0) and distributed resource allocation mode (being referred to as type2-1).
When using type0, type1 and type2-0 resource indicating mode, in a subframe, the VRB of two time slots will be mapped on two PRB of same frequency position, and the PRB sequence number mapping two time slots is identical with VRB sequence number, i.e. n
vRB=n
pRB, as shown in Figure 1, wherein, being mapped in corresponding PRB (with dotted box mark) of the VRB monoblock in dotted box.
When using the distributed resource indicating mode of type2-1, in a subframe, the VRB of two time slots will be mapped on two PRB of different frequency domain position, and the PRB sequence number of two time slots mapped is not identical with VRB sequence number, as shown in Figure 2, wherein, the VRB in dotted line frame and dotted box is mapped to (with corresponding dotted line frame and dotted box mark) in the PRB of diverse location.Therefore when using the distributed resource indicating mode of type2-1 to determine the resource mapping form of PDSCH, the resource indicating mode of type2-1 is difficult to type0, type1 and type2-0 resource indicating mode compatible, need the distributed resource indicating mode for type2-1 to carry out repeatedly complicated judgement, obtain the resource mapping form under different VRB and PRB mapping relations respectively.
In addition, due to the system bandwidth that LTE system is compatible different, therefore, the RB number comprised in each time slot (0.5ms) in different system bandwidths is different, such as: for these 6 kinds of system bandwidths of 1.4MHZ, 3MHZ, 5MHZ, 10MHZ, 15MHZ, 20MHZ, 6 RB, 15 RB, 25 RB, 50 RB, 75 RB and 100 RB are wherein comprised in each time slot respectively.
Under different system bandwidths, Physical Broadcast Channel (PhysicalBroadcastChannel, PBCH), master sync signal (PrimarySynchronizationSignal, PSS), to take RB position separately different for auxiliary synchronous signals (SecondarySynchronizationSignal, SSS).Need take 4 RB in the middle of partial time slot for PBCH, PBCH, when the RB number in described time slot is even number, in the RB that PBCH takies, initial RB is whole RB; When the RB number in described partial time slot is odd number, in the RB that PBCH takies, initial RB there will be the situation taking part RB, such as: comprise on a certain time slot of 6 RB if PBCH is mapped in, then initial RB is the 2nd RB, comprise on a certain time slot of 15 RB if PBCH is mapped in, then initial RB is the 5.5th RB.
Due to when determining the resource mapping form of PDSCH, need to remove PBCH from all RB, reference signal (ReferenceSignal, RS), PSS, after the RE that SSS takies, remaining resource distributes to the resource of PDSCH, but, for different system bandwidths, PBCH, PSS, the situation that SSS takies RB is different, therefore, concrete condition can only be carried out according to used system bandwidth specifically to treat, determine the PDSCH resource mapping form under certain system bandwidth, under determining under result in a kind of system bandwidth that the method for the resource mapping form of PDSCH is difficult to apply to other system bandwidth, cause PDSCH resource mapping form calculation of complex, consuming time longer, the problem of the seamless switching of different bandwidth environment can not be completed fast.
Summary of the invention
The embodiment of the present invention provides physical resource mapping method and the device of a kind of PDSCH, to solve in prior art PDSCH resource mapping form calculation of complex in different bandwidth situation, consuming time longer, can not complete the problem of the seamless switching of different bandwidth environment fast.
A physical resource mapping method of PDSCH, described method comprises:
Determine the descending sub frame in radio frames and/or special subframe;
For the arbitrary subframe in the descending sub frame determined and/or special subframe, determine the map type of this subframe, and determine the channel type that maps in this subframe and signal type according to map type;
According to the channel type mapped in subframe and signal type, determine the RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
A physical resource mapping device of PDSCH, described device comprises:
Subframe determination module, for determining descending sub frame in radio frames and/or special subframe;
Determination type module, for the arbitrary subframe determined for subframe determination module, determines the map type of this subframe, and determines the channel type that maps in this subframe and signal type according to map type;
Physical resource determination module, for according to the channel type mapped in subframe and signal type, determines the RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
In the scheme of the embodiment of the present invention, after descending sub frame and/or special subframe are carried out the determination of map type, according to the channel type mapped in map type determination subframe and signal type, and then determine the RE that other channels and signal take except PDSCH, and using physical resource that remaining RE maps as PDSCH, do not consider the difference of RB number in resource indicating mode and a time slot, but finally determine the resource mapping form of PDSCH, simplify and the determination of PDSCH resource mapping form under having unified different bandwidth situation, decrease calculating duration, and then the seamless switching of different bandwidth environment can be completed fast.
Accompanying drawing explanation
Fig. 1 is the relation schematic diagram of VRB and the PRB that in background technology, type0, type1 and type2-0 resource indicating mode is corresponding;
Fig. 2 is the relation schematic diagram of VRB and the PRB that in background technology, type2-1 resource indicating mode is corresponding;
Fig. 3 is the schematic diagram of the physical resource mapping method of PDSCH in the embodiment of the present invention one;
Fig. 4 is the schematic diagram of map type and the corresponding relation between channel type and signal type in the embodiment of the present invention one;
Fig. 5 is that in the embodiment of the present invention one, subframe belongs to the schematic diagram that map type 1 determines the method for the physical resource mapping PDSCH;
Fig. 6 is that in the embodiment of the present invention one, subframe belongs to the schematic diagram that map type 2 determines the method for the physical resource mapping PDSCH;
Fig. 7 is that in the embodiment of the present invention one, subframe belongs to the schematic diagram that map type 3 determines the method for the physical resource mapping PDSCH;
Fig. 8 is that in the embodiment of the present invention one, subframe belongs to the schematic diagram that map type 4 determines the method for the physical resource mapping PDSCH;
Fig. 9 is the physical resource mapping form schematic diagram of PDSCH in the embodiment of the present invention one;
Figure 10 is the structural representation of the physical resource mapping device of PDSCH in the embodiment of the present invention two.
Embodiment
Determination mode for existing PDSCH resource mapping form need carry out calculating the calculation of complex caused according to system bandwidth respectively, calculate the problem that duration is longer, embodiments provide a kind of new PDSCH physical resource mapping method, each channel type that may map according to the descending sub frame in radio frames and/or special subframe and the difference of signal type, subframe is divided into multiple map type, when needing the physical resource determining the PDSCH wherein mapped for a certain subframe, can map type belonging to this subframe, determine the channel type that wherein can map and signal type, and then after the RE that outside removal PDSCH, other channels and signal take, remaining RE is the physical resource that PDSCH maps.Because the scheme of the embodiment of the present invention is without the need to considering resource indicating mode, and can be applicable in the system of various different bandwidth, therefore, effectively can simplify and unify PDSCH resource mapping method, decrease the calculating duration for PDSCH resource mapping form, and then the seamless switching of different bandwidth environment can be completed fast.
The solution of the present invention is described in detail below in conjunction with specific embodiment.
Embodiment one
As shown in Figure 3, be the schematic diagram of the physical resource mapping method of a kind of PDSCH in the embodiment of the present invention one, described method specifically comprises the following steps:
Step 101: determine the descending sub frame in radio frames and/or special subframe.
Step 102: for the arbitrary subframe in the descending sub frame determined and/or special subframe, determine the map type of this subframe.
Subframe involved in various embodiments of the present invention refers to descending sub frame in radio frames or special subframe.
Polytype channel or signal can be mapped in a subframe, but because some channel or signal can not be mapped in same subframe simultaneously, such as: PSS and SSS can not be mapped in a subframe simultaneously, therefore, the channel type that may map in a subframe and the combination of signal type are confirmable.
In a descending sub frame or special subframe, the channel type that can map to has: PBCH and PDSCH, and signal type has: SSS, PSS and RS, and for a subframe, the channel type that wherein can simultaneously map to and signal type are distinguished as follows:
Map type 1 is for have mapped the map type of PBCH, SSS, RS and PDSCH.
If have mapped PBCH, SSS, RS and PDSCH in a subframe, then this subframe belongs to map type 1.
Map type 2 is for have mapped the map type of PSS, RS and PDSCH.
If have mapped PSS, RS and PDSCH in a subframe, then this subframe belongs to map type 2.
Map type 3 is for have mapped the map type of SSS, RS and PDSCH.
If have mapped SSS, RS and PDSCH in a subframe, then this subframe belongs to map type 3.
Map type 4 is for have mapped the map type of RS and PDSCH.
If have mapped RS and PDSCH in a subframe, then this subframe belongs to map type 4.
Step 103: determine the channel type that maps in this subframe and signal type according to map type.
Owing to can being the 4 kinds of map types related in step 102 according to mapping to the channel type of subframe and signal type by sub-frame division, therefore, map type and the corresponding relation between channel type and signal type can being set up in advance, as shown in Figure 4, be specially:
The channel type of map type 1 correspondence is PBCH and PDSCH, and signal type is SSS and RS, and represent that belonging to the channel mapped in the subframe of map type 1 is PBCH and PDSCH, signal is SSS and RS.
The channel type of map type 2 correspondence is PDSCH, and signal type is PSS and RS, and represent that belonging to the channel mapped in the subframe of map type 2 is PDSCH, signal is PSS and RS.
The channel type of map type 3 correspondence is PDSCH, and signal type is SSS and RS, and represent that belonging to the channel mapped in the subframe of map type 3 is PDSCH, signal is SSS and RS.
The channel type of map type 4 correspondence is PDSCH, signal type RS, and represent that belonging to the channel mapped in the subframe of map type 4 is PDSCH, signal is RS.
Owing to having preset map type and the corresponding relation between channel type and signal type, therefore, in this step 103, the channel type that can map in the subframe in determining step 102 and signal type.
In the scheme of this step 103, be according to the map type of subframe and then determine its channel mapped and signal, in the present embodiment, be also not limited to first according to the channel that can map in subframe and signal type, then determine the map type of its correspondence further.
Step 104: according to the channel type mapped in subframe and signal type, determines the RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
4 kinds of map types that may belong to for subframe and the channel type of its correspondence and signal type, take system bandwidth as the 10M i.e. situation of 50 RB (having 12 subcarriers in each RB) be example, when adopting conventional cyclic prefix, because each time slot has 7 OFDM symbol, therefore, the running time-frequency resource in subframe be 12*50*7*2 RE.
The mode mapping the physical resource of PDSCH under determining often kind of map type is described below respectively:
For map type 1:
If subframe belongs to map type 1, then the channel mapping to this subframe is PBCH and PDSCH, and signal is SSS and RS, determines the mode of the physical resource mapping PDSCH as shown in Figure 5:
First, in the running time-frequency resource of 14*600 the RE determined, determine the RE mapping PBCH and SSS.
Then, determine to map the RE shared by RS, now, the RE shared by part RS can cover the RE that PBCH takies.
The position of the RE shared by PBCH is 4 RB in the middle of partial time slot, when first mapping the RE shared by PBCH, when then mapping the RE shared by RS, there will be the situation that the RE shared by part RE and PBCH shared by RS overlaps, therefore when there is the situation of described coincidence, the RE shared by RS can be covered the RE shared by PBCH.The position of the RE shared by RS determines according to the parameter such as cell id and antenna amount.
Finally, from the Resource Block RB distributed for PDSCH, extract the RE that the RE that do not map PBCH, SSS and RS maps as PDSCH.
By the mode shown in Fig. 5, achieve and utilize covering and extract the resource mapping form that the method combined obtains PDSCH.
For map type 2:
If subframe belongs to map type 2, then the channel mapping to this subframe is PDSCH, and signal is PSS and RS, determines the mode of the physical resource mapping PDSCH as shown in Figure 6:
First, in the running time-frequency resource of 14*600 the RE determined, determine the RE mapping PSS.
Then, determine to map the RE shared by RS.
Finally, from the Resource Block RB distributed for PDSCH, extract the RE that the RE that do not map PSS and RS maps as PDSCH, and then obtain the resource mapping form of PDSCH.
For map type 3:
If subframe belongs to map type 3, then the channel mapping to this subframe is PDSCH, and signal is SSS and RS, determines the mode of the physical resource mapping PDSCH as shown in Figure 7:
First, in the running time-frequency resource of 14*600 the RE determined, determine the RE mapping SSS.
Then, determine to map the RE shared by RS.
Finally, from the Resource Block RB distributed for PDSCH, extract the RE that the RE that do not map SSS and RS maps as PDSCH, and then obtain the resource mapping form of PDSCH.
For map type 4:
If subframe belongs to map type 4, then the channel mapping to this subframe is PDSCH, and signal is RS, determines the mode of the physical resource mapping PDSCH as shown in Figure 8:
First, in the running time-frequency resource of 14*600 the RE determined, determine the RE mapping RS.
Then, from the Resource Block RB distributed for PDSCH, extract the RE that the RE that do not map RS maps as PDSCH, and then obtain the resource mapping form of PDSCH.
By the scheme of the embodiment of the present invention one, the channel type that may map to according to subframe is different with signal type, be several map type by sub-frame division, and according to the corresponding relation of map type and channel type and signal type, the physical resource mapping PDSCH under often kind of map type in subframe can be determined, and then obtain the resource mapping form of the PDSCH under often kind of map type, as shown in Figure 9, simplify and unified PDSCH resource mapping method, decreasing the calculating duration for PDSCH resource mapping form.
Embodiment two
Based on the same design with the embodiment of the present invention one, the embodiment of the present invention two provides the physical resource mapping device of a kind of PDSCH, as shown in Figure 10, the physical resource mapping device of described PDSCH comprises: subframe determination module 11, determination type module 12 and physical resource determination module 13, wherein:
Subframe determination module 11, for determining descending sub frame in radio frames and/or special subframe.
Determination type module 12, for the arbitrary subframe determined for subframe determination module 11, determines the map type of this subframe, and determines the channel type that maps in this subframe and signal type according to map type.
Physical resource determination module 13, for according to the channel type mapped in subframe and signal type, determines the RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
Preferably, described determination type module 12, comprising:
First determining unit 21, for when determining that map type is the map type that have mapped PBCH, SSS, RS and PDSCH, determine that the channel type corresponding with described map type is PBCH and PDSCH, signal type is SSS and RS.
Described physical resource determination module 13, specifically for determining the RE mapped shared by PBCH and the RE mapped shared by SSS, and after mapping PBCH, determine to map the RE shared by RS, and from the RB distributed for PDSCH, extract the resource that the RE that do not map PBCH, SSS and RS maps as PDSCH.
Preferably, described determination type module 12, also comprises:
Second determining unit 22, for when determining that map type is the map type that have mapped PSS, RS and PDSCH, determine that the channel type corresponding with described map type is PDSCH, signal type is PSS and RS.
Described physical resource determination module 13, maps the RE shared by PSS specifically for determining, and after mapping PSS, determines to map the RE shared by RS, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map PSS and RS maps as PDSCH.
Preferably, described determination type module 12, also comprises:
3rd determining unit 23, for when determining that map type is the map type that have mapped SSS, RS and PDSCH, determine that the channel type corresponding with described map type is PDSCH, signal type is SSS and RS.
Described physical resource determination module 13, maps the RE shared by SSS specifically for determining, and after mapping SSS, determines to map the RE shared by RS, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map SSS and RS maps as PDSCH.
Preferably, described determination type module 12, also comprises:
4th determining unit 24, for when determining that map type is the map type that have mapped RS and PDSCH, determine that the channel type corresponding with described map type is PDSCH, signal type is RS.
Described physical resource determination module 13, maps the RE shared by RS specifically for determining, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map RS maps as PDSCH.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a physical resource mapping method of Physical Downlink Shared Channel PDSCH, is characterized in that, described method comprises:
Determine the descending sub frame in radio frames and/or special subframe;
For the arbitrary subframe in the descending sub frame determined and/or special subframe, determine the map type of this subframe, and determine the channel type that maps in this subframe and signal type according to map type;
According to the channel type mapped in subframe and signal type, determine the Resource Unit RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
2. the method for claim 1, is characterized in that, described map type is the map type that have mapped Physical Broadcast Channel PBCH, auxiliary synchronous signals SSS, reference signal RS and PDSCH;
According to the map type that have mapped PBCH, SSS, RS and PDSCH, determine that the channel type mapped in subframe is PBCH and PDSCH, the signal type of mapping is SSS and RS;
Determine the RE that other channels and signal take except PDSCH, and using the resource that RE remaining in this subframe maps as PDSCH, specifically comprise:
Determine the RE mapped shared by PBCH and the RE mapped shared by SSS, and after mapping PBCH, determine to map the RE shared by RS;
From the Resource Block RB distributed for PDSCH, extract the resource that the RE that do not map PBCH, SSS and RS maps as PDSCH.
3. the method for claim 1, is characterized in that, described map type is the map type that have mapped master sync signal PSS, RS and PDSCH;
According to the map type that have mapped PSS, RS and PDSCH, determine that the channel type mapped in subframe is PDSCH, the signal type of mapping is PSS and RS;
Determine the RE that other channels and signal take except PDSCH, and using the resource that RE remaining in this subframe maps as PDSCH, specifically comprise:
Determine to map the RE shared by PSS, and after mapping PSS, determine to map the RE shared by RS;
From the RB distributed for PDSCH, extract the resource that the RE that do not map PSS and RS maps as PDSCH.
4. the method for claim 1, is characterized in that, described map type is the map type that have mapped SSS, RS and PDSCH;
According to the map type that have mapped SSS, RS, PDSCH, determine that the channel type mapped in subframe is PDSCH, the signal type of mapping is SSS and RS;
Determine the RE that other channels and signal take except PDSCH, and using the resource that RE remaining in this subframe maps as PDSCH, specifically comprise:
Determine to map the RE shared by SSS, and after mapping SSS, determine to map the RE shared by RS;
From the RB distributed for PDSCH, extract the resource that the RE that do not map SSS and RS maps as PDSCH.
5. the method for claim 1, is characterized in that, described map type is the map type that have mapped RS and PDSCH;
According to the map type that have mapped RS and PDSCH, determine that the channel type mapped in subframe is PDSCH, the signal type of mapping is RS;
Determine the RE that other channels and signal take except PDSCH, and using the resource that RE remaining in this subframe maps as PDSCH, specifically comprise:
Determine to map the RE shared by RS;
From the RB distributed for PDSCH, extract the resource that the RE that do not map RS maps as PDSCH.
6. a physical resource mapping device of Physical Downlink Shared Channel PDSCH, is characterized in that, described device comprises:
Subframe determination module, for determining descending sub frame in radio frames and/or special subframe;
Determination type module, for the arbitrary subframe determined for subframe determination module, determines the map type of this subframe, and determines the channel type that maps in this subframe and signal type according to map type;
Physical resource determination module, for according to the channel type mapped in subframe and signal type, determines the Resource Unit RE that other channels and signal take except PDSCH, and using physical resource that RE remaining in this subframe maps as PDSCH.
7. device as claimed in claim 6, it is characterized in that, described determination type module, comprising:
First determining unit, for determine map type be have mapped Physical Broadcast Channel PBCH, auxiliary synchronous signals SSS, reference signal RS and PDSCH map type time, determine that the channel type in subframe is PBCH and PDSCH, signal type is SSS and RS;
Described physical resource determination module, specifically for determining the RE mapped shared by PBCH and the RE mapped shared by SSS, and after mapping PBCH, determine to map the RE shared by RS, and from the RB distributed for PDSCH, extract the resource that the RE that do not map PBCH, SSS and RS maps as PDSCH.
8. device as claimed in claim 6, it is characterized in that, described determination type module, also comprises:
Second determining unit, for when determining that map type is the map type that have mapped master sync signal PSS, RS and PDSCH, determine that the signal type in subframe is PSS and RS, channel type is PDSCH;
Described physical resource determination module, maps the RE shared by PSS specifically for determining, and after mapping PSS, determines to map the RE shared by RS, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map PSS and RS maps as PDSCH.
9. device as claimed in claim 6, it is characterized in that, described determination type module, also comprises:
3rd determining unit, for when determining that map type is the map type that have mapped SSS, RS and PDSCH, determine that the channel type mapped in subframe is PDSCH, signal type is SSS and RS;
Described physical resource determination module, maps the RE shared by SSS specifically for determining, and after mapping SSS, determines to map the RE shared by RS, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map SSS and RS maps as PDSCH.
10. device as claimed in claim 6, it is characterized in that, described determination type module, also comprises:
4th determining unit, for when determining that map type is the map type that have mapped RS and PDSCH, determine that the channel type mapped in subframe is PDSCH, signal type is RS;
Described physical resource determination module, maps the RE shared by RS specifically for determining, and from the RB distributed for PDSCH, extracts the resource that the RE that do not map RS maps as PDSCH.
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| CN105636122A (en) * | 2014-10-28 | 2016-06-01 | 深圳市中兴微电子技术有限公司 | Physical resource element quick mapping method and physical resource element quick mapping device |
| CN106954264B (en) * | 2016-01-07 | 2019-06-21 | 普天信息技术有限公司 | A kind of downlink physical shares the method for mapping resource and system of channel PDSCH |
| CN106686735A (en) * | 2016-12-26 | 2017-05-17 | 中国科学院微电子研究所 | Physical downlink shared channel resource mapping method |
| CN108934071B (en) * | 2017-05-25 | 2022-03-15 | 维沃移动通信有限公司 | Transmission method of synchronous signal block, network equipment and terminal |
| CN115811391B (en) * | 2022-11-19 | 2024-03-22 | 中国电子科技集团公司第五十四研究所 | Downlink shared channel transmitting device of low-orbit constellation system |
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Address after: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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